Understanding Bodycote

Low to no emissions

OUR COMMITMENT

Our low-carbon processes help customers accelerate the achievement of their environmental ambitions faster and more effectively.

OUR 2030 GOAL

We will help our batch atmospheric processing customers reduce their greenhouse gas emissions by at least 125,000 tonnes of CO2e by 2030.

OUR PRIORITIES

• Lower carbon processing
• Customer saved emissions (Scope 1 and Scope 2)
• Avoided emissions (Scope 4)
• Carbon calculation

Sustainable end-markets

OUR COMMITMENT

Our technologies support emerging low-carbon industries such as clean tech, EV manufacturing and renewable energy generation sectors.

OUR 2030 GOAL

We will increase the proportion of revenue supporting sustainable end-use markets and applications to at least 20% by 2035.

OUR PRIORITIES

• Supporting low-carbon industries
• Enabling the development of wind, solar, wave and fuel cell technologies
• Accelerating the implementation of low-carbon solutions

Safe & compliant

OUR COMMITMENT

Our solutions improve product safety and assist with adherence to important compliance requirements.

OUR 2030 GOAL

We will work as the industry standard-setter for material science that prioritises safety, health, and the preservation of the planet.

OUR PRIORITIES

• Certified solutions (eg. REACH compliant)
• Improving sustainability performance (eg. via surface technology)
• Safer coatings (eg. HVOF coating)

Resource efficient

OUR COMMITMENT

Our treatments enable customers to achieve more with less by increasing durability, resilience, and sustainability performance.

OUR 2030 GOAL

We will provide specialist technologies and support research and development that enables customers to realise their growth and sustainability ambitions.

OUR PRIORITIES

• Specialist technologies that support customer sustainability
• Solutions that enable materials, energy, waste and water savings for customers (e.g. powder metallurgy, additive manufacturing)
• Involvement in customer R&D into more sustainable solutions

Zero harm

OUR COMMITMENT

We promote a safety-first culture to ensure that all our people return home from work safely and securely.

OUR 2030 GOAL

We will embed our zero harm culture Groupwide and drive continuous improvement in our performance.

OUR PRIORITIES

• Creating a zero-harm culture
• World-class EHS management system
• Governance, training, and accountability
• Near miss reporting for continuous improvement

Environmental leadership

OUR COMMITMENT

We are taking direct action to manage our use of natural resources and to improve the energy efficiency of our processes.

OUR 2030 GOAL

We will reduce our Scope 1 and Scope 2 emissions by 46%.

OUR PRIORITIES

• Specialist technologies that support customer sustainability
• Solutions that enable materials, energy, waste and water savings for customers (e.g. powder metallurgy, additive manufacturing)
• Involvement in customer R&D into more sustainable solutions

Engaged team

OUR COMMITMENT

We want to empower our expert team by giving them the tools, rewards, environment and resources they need to succeed.

OUR 2030 GOAL

We want to be recognised as one of the best companies to work for and commit to setting an employee engagement performance target in 2025.

OUR PRIORITIES

• Values, culture, and purpose
• Employee engagement
• Skills and career development
• Talent attraction and retention

Diverse workplace

OUR COMMITMENT

We are committed to creating a diverse and dynamic workplace in which everybody can thrive.

OUR 2030 GOAL

We will continue to increase diversity among our Board and senior management teams and work to become a leader in our industry.

OUR PRIORITIES

• Diversity in the workplace
• Gender and ethnicity representation
• Fair global working and recruitment practices

Atmospheric carburising

Carburising is accomplished by heating the metal in a carbon rich atmosphere above transformation temperature for a pre-determined time. Subsequent to carburising, parts are quenched to harden the surface carburising layer. The core remains unaffected. It is a widely used surface hardening process for low carbon steel. The industrial importance of carburising is expressed in its market share, as one third of all hardening heat treatment is covered by carburising and hardening.

Benefits of Atmospheric carburising

Carburising and quench produce hard surfaces which are resistant to wear. Moreover, failure from impact loading is avoided due to a softer core. Unlike case hardening processes, this process is usually used for deep case depths.

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Powdermet® - Near net shape (NNS)

Powdermet® NNS technology produces components with a high degree of complexity not possible via conventional means.

Benefits of Powdermet^® - Near net shape (NNS)

• Provides freedom and flexibility in design
• Designs are not limited by machining processes
• Improves material yield and efficiency
• Reduces material usage compared to conventional forging and machining techniques

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High Velocity Oxygen Fuel (HVOF) coating

High-Velocity Oxygen Fuel (HVOF) coating is a thermal spray coating process used to improve or restore a component’s surface properties or dimensions, thus extending equipment life by significantly increasing erosion and wear resistance, and corrosion protection.

Molten or semi-molten materials are sprayed onto the surface by means of the high temperature, high-velocity gas stream, producing a dense spray coating which can be ground to a very high surface finish.

The utilization of the HVOF coating technique allows the application of coating materials such as metals, alloys, and ceramics to produce a coating of exceptional hardness, outstanding adhesion to the substrate material and providing substantial wear resistance and corrosion protection.

As the technology specialists in HVOF coating, Bodycote provides an array of spray coating materials to suit your specific needs. Backed by a customer-driven service, our facilities process a wide variety of component sizes to exacting standards with reliable, repeatable results.

Benefits of High Velocity Oxygen Fuel (HVOF) coating

HVOF coating:

• Reduced costs;
• Improved performance;
• Improved electrical properties;
• Enabling components to operate in higher/lower temperatures;
• Enabling components to operate within harsh chemical environments;
• Improved efficiency; and
• Improved life of mating components

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Induction hardening

Induction hardening is used to increase the mechanical properties of ferrous components in a specific area. Typical applications are powertrain, suspension, engine components and stampings. Induction hardening is excellent at repairing warranty claims / field failures. The primary benefits are improvements in strength, fatigue and wear resistance in a localised area without having to redesign the component.

Benefits of Induction hardening

Favoured for components that are subjected to heavy loading. Induction imparts a high surface hardness with a deep case capable of handling extremely high loads. Fatigue strength is increased by the development of a soft core surrounded by an extremely tough outer layer. These properties are desirable for parts that experience torsional loading and surfaces that experience impact forces. Induction processing is performed one part at a time allowing for very predictable dimensional movement from part to part.

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Corr-I-Dur®

Corr-I-Dur® is a proprietary Bodycote thermochemical treatment for simultaneous improvement of corrosion resistance and wear properties through generating an iron nitride-oxide compound layer.

Benefits of Corr-I-Dur®

Corr-I-Dur® is favoured for components that are subjected to a corrosive environment in combination with wear. A very successful alternative to hard chromium, electroless nickel and various galvanic coatings through simultaneous improvement of corrosion and wear behaviour; Corr-I-Dur® layers have a very good bonding to the substrate as they are produced in a diffusion process. In many cases parts can be machined with the final dimensions and customers can skip additional steps such as grinding after the Corr-I-Dur® treatment.

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K-Tech ceramic coatings

Bodycote offers a unique range of thermochemically formed ceramic coatings for the prevention of wear and corrosion in a wide variety of industrial applications and for every type of surface.

Bodycote’s K-Tech ceramic coatings range, have been uniquely developed for applications in specific industries. Several formulae cover a virtually limitless number of potential applications which can be applied to most ferrous and some non-ferrous metals.

Chromium oxide ceramic material thermochemically bonded to customer specified areas on a part, including external diameters, internal diameters and some out-of-sight holes and ports. Individual ceramic particles are sub-micron in size and consist of mixtures of selected ceramic materials bonded together and to the substrate.

Benefits of K-Tech ceramic coatings

• Hardness
• Substantially improved component lifetime
• Low friction; the coated surface is anti-fouling
• Corrosion protection from absolutely dense, pore free barriers
• Increases bond strength
• Chemically, not mechanically, bonded
• Extraordinary wear resistance
• Effective coating of complex geometries and internal bores
• No measurable buildup on top of the plating/coating
• No pre-grinding required
• Increases plating/coating life by 4 to 10 times in most corrosive environments
• Resistant to thermal cycling/shock
• Superior sliding wear resistance and high electrical resistivity
• Extremely fine grain structure

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Plasma spray

Plasma spray is a thermal spray coating process used to produce a high quality coating by a combination of high temperature, high energy heat source, a relatively inert spraying medium, usually argon, and high particle velocities.

Plasma is the term used to describe gas which has been raised to such a high temperature that it ionizes and becomes electrically conductive.

The utilisation of plasma spray coating technology allows the spraying of almost any metallic or ceramic on to a large range of materials with exceptional bond strength, while minimising distortion of the substrate.

As the technology specialists in plasma spray, Bodycote provides an array of thermal spray coating materials to suit your specific needs. Backed by a customer-driven service, our facilities process a wide variety of component sizes to exacting standards with reliable, repeatable results.

Benefits of Plasma spray

The great advantage of the plasma spray coating technique is its ability to spray a wide range of materials, from metals to refractory ceramics, on both small and large components offering:

• corrosion protection
• wear resistance
• clearance control – abrasives and abradables
• heat and oxidation resistance
• temperature management
• electrical resistivity and conductivity

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Low pressure carburising (LPC)

LPC is an advanced technology that offers the design engineer an alternative to atmosphere carburising for improved case depth uniformity, dimensional control, part cleanliness, and process flexibility.

LPC is a method of pure carburisation combined with pure diffusion and is used to obtain a hardened surface and tough core, giving increased wear resistance and fatigue life, with minimal risk of treatment distortion.

The process gives high hardness below the surface compared to conventional carburising treatments, and allows precise control of case depth, microstructure and hardness, even for complex shapes and blind holes.

The process doesn’t create inter-granular oxidation on the surface of steels due to lack of oxygen in the atmosphere and eliminates the post grinding operations for parts that require higher surface quality and hardness.

LPC is a clean process carried out under vacuum, and has signifcantly lower environmental impact than atmospheric heat treatment technologies.

Benefits of Low pressure carburising

• The pitch to root ratio of the carburised layer (case depths) in gears is almost 1:1 (uniform).
• High hardness below the surface compared to conventionally carburised parts.
• Faster cycle times.
• Parts can be carburised between 930°C and 1000°C (1700° and 1830°F).
• Penetration of carbon in deep blind holes resulting in uniform hardness on the entire profile.
• Carburising of small holes and blind holes.
• Avoidance of part cleaning after the heat treatment due to high pressure gas quenching (dry quench).
• Reduction of dimensional alterations by temperature-independent heat transfer during high pressure gas quenching.
• Enhanced mechanical properties - elimination of inter-granular oxidation layer, improved fatigue properties.
  • Dimensional control - low distortion, predictable and repeatable
  • Environmentally friendly
  • Reduced manufacturing steps such as post grinding, cleaning and inspection
  • Enhanced cleanliness of products
  • Precise control of case depth, microstructure and hardness
  • Better case depth uniformity for complex shapes. Case depth uniformity can be maintained within ±0.002” in most cases.

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Boriding/Boronizing

Boriding is a thermochemical surface hardening method which can be applied to a wide range of ferrous, non-ferrous and cermet materials. The process entails diffusion of boron atoms into the lattice of the parent metal and a hard interstitial boron compound is formed at the surface. The surface boride may be in the form of either a single phase or a double phase boride layer.

Benefits of Boriding/Boronizing

Boriding provides a uniform hardness layer from the surface on to the entire depth of the diffused layer. The hardness achieved is many times higher than any other surface hardening process. The combination of high hardness and low coefficient of friction enhance wear, abrasion and surface fatigue properties. Other benefits associated with boriding are retention of hardness at elevated temperature, corrosion resistance in acidic environment, reduction in use of lubricants and a reduced tendency to cold weld.

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Carbonitriding

Carbonitriding is an austenitic (above A3) case hardening process similar to carburising, with the addition of nitrogen (via NH₃ gas), used to increase wear resistance and surface hardness through the creation of a hardened surface layer.

Benefits of Carbonitriding

Carbonitriding is applied primarily to produce a hard and wear resistant case. The diffusion of both carbon and nitrogen increases the hardenability of plain carbon and low alloy steels, and creates a harder case than carburising. The carbonitriding process is particularly suited for clean mass production of small components. Due to the lower temperature required for the carbonitriding, compared to carburising, distortion is reduced. Mild quenching speed reduces the risk of quench cracking.

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Ion/Plasma nitriding

Plasma nitriding (Ion nitriding) is a plasma supported thermochemical case hardening process used to increase wear resistance, surface hardness and fatigue by generation of a hard layer including compressive stresses.

Benefits of Ion/Plasma nitriding

The advantages of gaseous nitriding processes can be surpassed by plasma nitriding. Particularly when applied to higher alloyed steels, plasma nitriding imparts a high surface hardness which promotes high resistance to wear, scuffing, galling and seizure. Fatigue strength is increased mainly by the development of surface compressive stresses. Plasma nitriding is a smart choice whenever parts are required to have both nitrided and soft areas. The possibility of generating a compound layer free diffusion layer is often used in plasma nitriding prior to PVD or CVD coating. Tailor made layers and hardness profiles can be achieved.

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Gas nitriding

Gas nitriding is a thermochemical case hardening process used to increase wear resistance, surface hardness and fatigue life by dissolution of nitrogen and hard nitride precipitations.

Benefits of Gas nitriding

Favoured for components that are subjected to heavy loading, nitriding imparts a high surface hardness which promotes high resistance to wear, scuffing, galling and seizure. Fatigue strength is increased mainly by the development of surface compressive stresses. The wide range of possible temperatures and case depths, which allow adjustment of different properties of the treated parts, give gas nitriding a broad field of applications.

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Ferritic nitrocarburising – gas

Bodycote’s proprietary process of this low temperature surface treatment, called Lindure^®, involves the addition of oxygen. As a result, there are significant improvements of fatigue properties, adhesive wear resistance and anti-seize properties.

Benefits of Ferritic nitrocarburising – gas

The primary objective of ferritic nitrocarburising treatment is to improve the anti-scuffing characteristics of components. The compound layer exhibits significant improvement in adhesive wear resistance. With the introduction of nitrogen in the diffused zone fatigue properties are enhanced. An added benefit of the process is minimal distortion due to short process cycle within the ferrite phase.

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Neutral hardening

Also named martensitic or quench hardening, neutral hardening is a heat treatment used to achieve high hardness/strength on steel. It consists of austenitising, quenching and tempering, in order to retain a tempered martensite or bainite structure.

Benefits of Neutral hardening

There are several benefits of neutral hardening, depending on the steel type:

• Heavy loaded parts can be given an optimal combination of high strength, toughness and, if applicable, temperature resistance
• Such parts can be made lighter and more stiff, due to higher strength
• Tools and dies get the required high wear and/or heat resistance while maintaining toughness
• Parts that need grinding to low roughness, acquire the required machinability
• For all these purposes, if the parts are made of martensitic stainless steels, the corrosion resistance is only available after the heat treatment

Tool steels: the desired properties of high hardness, wear resistance, heat resistance and machinability can only be given by hardening.

Martensitic stainless steels: these steels only get their maximum corrosion resistance by hardening.

For all steel types: during the shaping of the parts, (takes place before the heat treatment), the material is relatively soft and therefore easy to machine.

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Ausbay quenching

Quenching technique (limited to certain high strength alloy steels) that reduces the residual internal stresses and distortion resulting from non-uniform transformation and thermal shock typical of conventional oil quenching.

Benefits of Ausbay quenching

Reduction in residual stress and distortion as compared to conventional oil quenching of selected high strength steels. May permit heat treatment of near net shape parts and minimise required machining/grinding of components after heat treatment.

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Austempering

Austempering is used to increase strength, toughness, and reduce distortion. Parts are heated to the hardening temperature, then cooled rapidly enough to a temperature above the martensite start (Ms) temperature and held for a time sufficient to produce the desired bainite microstructure.

Benefits of Austempering

Austempering is a hardening process for metals which yields desirable mechanical properties including:

• Higher ductility, toughness, and strength for a given hardness.
• Resistance to shock
• Reduced distortion, specifically with thin parts.

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Martempering/Marquenching

The purpose of Martempering/Marquenching is to delay the cooling for a length of time to equalise the temperature throughout the piece. This will minimise distortion, cracking and residual stress.

Benefits of Martempering/Marquenching

Reduced cracking due to thermal stress. Reduced residual stress in the quenched part section for parts with varying geometry, size, or weight.

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Press quenching

The controlled hardening in restraining dies, of close tolerance components, such as gears, bearing races etc. Ensures good dimensional control and uniform hardening.

Benefits of Press quenching

• Favoured for large round or flat components;
• Elimination of distortion, and thereby reduction of post heat treatment machining; and
• An important cost saving factor.

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Double hardening

Sometimes, due to misuse of language, double hardening means long duration of austenitisation or long carburising time, followed by a soft hardening or a slow cooling outside the heating chamber (like an annealing step) and re-austenitisation followed by a hardening step (quench).

Double hardening also involves hardening a carburised part twice whereby the first hardening is carried out from the hardening temperature of the core part, and the second from the hardening temperature of the case (see DIN 17014).

Benefits of Double hardening

• Refined grain size and microstructure of the core of the part, grown during long duration at high temperature
• Avoids surplus/retained austenite content in the case depth
• Reduces or limits the distortion level of parts with complex shapes
• Adjusts more precisely the hardness of the core and the case

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Tempering

Tempering is a low temperature (below A1) heat treatment process normally performed after neutral hardening, double hardening, atmospheric carburising, carbonitriding or induction hardening in order to reach a desired hardness/toughness ratio.

Benefits of Tempering

The maximum hardness of a steel grade, which is obtained by hardening, gives the material a low toughness. Tempering reduces the hardness in the material and increases the toughness. Through tempering you can adapt materials properties (hardness/toughness ratio) to a specified application.

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Solution and age: Aluminium alloys

There are a number of wrought and cast aluminium alloys that can be strengthened by solution treating and aging to a variety of different tempers.

Benefits of Solution and age: Aluminium alloys

The mechanical properties of heat treatable alloy components can be optimised by the selection of an appropriate solution and age process sequence. For certain alloys, corrosion resistance can, for example, be improved at the expense of strength and vice versa.

Depending on the alloy and cross section at the time of solution treatment, various cooling methods can potentially be utilised to reduce distortion.

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Solution and age: Nickel alloys

Solution treatment is the heating of an alloy to a suitable temperature, holding it at that temperature long enough to cause one or more constituents to enter into a solid solution and then cooling it rapidly enough to hold these constituents in solution. Subsequent precipitation heat treatments allow controlled release of these constituents either naturally (at room temperature) or artificially (at higher temperatures).

Benefits of Solution and age: Nickel alloys

There are a multitude of cast and wrought nickel-based alloys that can have various desirable characteristics enhanced by either solution treating or by solution treating and precipitation age hardening. Characteristics such as room temperature and/or elevated temperature mechanical strength, corrosion resistance and oxidation resistance are typically enhanced by such heat treatments.

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Precipitation hardening: Stainless steels

Precipitation heat treatments strengthen materials by allowing the controlled release of constituents to form precipitate clusters which significantly enhance the strength of the component.

Benefits of Precipitation hardening: Stainless steels

There are a multitude of cast and wrought stainless steel alloys that can have various desirable characteristics enhanced by either solution treating or by solution treating and precipitation age hardening. Characteristics such as room temperature and/or elevated temperature mechanical strength and corrosion resistance are typically enhanced by such heat treatments.

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Annealing

Typically, in steels, annealing is used to reduce hardness, increase ductility and help eliminate internal stresses.

Benefits of Annealing

Annealing will restore ductility following cold working and hence allow additional processing without cracking. Annealing may also be used to release mechanical stresses induced by grinding, machining etc. hence preventing distortion during subsequent higher temperature heat treatment operations. In some cases, annealing is used to improve electrical properties.

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Recrystallisation

Recrystallisation is a process accomplished by heating whereby deformed grains are replaced by a new set of grains that nucleate and grow until the original grains have been entirely consumed.

Recyrstallisation annealing is an annealing process applied to cold-worked metal to obtain nucleation and growth of new grains without phase change. This heat treatment removes the results of the heavy plastic deformation of highly shaped cold formed parts. The annealing is effective when applied to hardened or cold-worked steels, which recrystallise the structure to form new ferrite grains.

Benefits of Recrystallisation

• allows recovery process by reduction or removal of work-hardening effects (stresses)
• increases equiaxed ferrite grains formed from the elongated grains
• decreases the strength and hardness level
• increases ductility

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Normalising

Normalising aims to give the steel a uniform and fine-grained structure. The process is used to obtain a predictable microstructure and an assurance of the steel’s mechanical properties.

Benefits of Normalising

After forging, hot rolling or casting a steel’s microstructure is often unhomogeneous consisting of large grains, and unwanted structural components such as bainite and carbides. Such a microstructure has a negative impact on the steel’s mechanical properties as well as on the machinability. Through normalising, the steel can obtain a more fine-grained homogeneous structure with predictable properties and machinability.

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Subcritical annealing/Intercritical annealing

Sub-critical annealing (or sub-critical treatment) is annealing carried out slightly below the eutectoid temperature (Ac1 point = eutectoid transformation (723°C for carbon-steels)). Sub-critical annealing does not involve the formation of austenite, while intercritical annealing involves the formation of ferrite and austenite (< 0.8%C carbon-steels).

Benefits of Subcritical annealing/Intercritical annealing

The aim of the soft annealing process is to form an even distribution of spheroidal carbides in the steel, which will make the material softer and tougher. Normally, increasing the size of the spheroids will increase the steel’s machinability.

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Soft annealing

Soft annealing is a high temperature heat treatment process performed around A1. As the name suggests the aim of the process is to make a material as soft as possible. After soft annealing the material will have a soft and easy to machine structure.

Benefits of Soft annealing

Steels with higher carbon content, and most high-alloy steels, which are allowed to air cool after hot working, such as forging or hot rolling, are usually hard to machine. Soft annealing reduces the hardness and makes the material easier to machine. Soft annealing of low carbon steels < 0,35% C will normally result in a structure too soft and sticky for cutting operations.

The risk of hardening cracks during re-hardening of quenched and tempered steel can be reduced by soft annealing prior to the hardening and tempering process.

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Ion implantation

Bodycote’s Implantec process can be used to improve the friction coefficient, adhesive wear and surface hardness of polymers and metals by bombarding surfaces with a high energy ion beam.

Benefits of Ion implantation

Ion implantation has a number of benefits, including:

• Surface hardening of the material, thus making it very resistant to wear, particularly adhesive wear;
• Reduction of friction coefficient, which reduces seizure;
• Increased fatigue limit by up to 30%;
• Surface treatment with no rise in temperature (cold metallurgy);
• No geometric distortion;
• Preservation of the state of the surface (e.g., super finishing) and its mechanical characteristics (e.g., low temperature tempered steel);
• No peeling (it is not a coating); and
• Greatly improved resistance to corrosion.

The process is carried out locally and on pieces that are already fully machined, and can be applied to metals, polymers or elastomers.

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Stress relieving

Stress relieving is carried out on metal products in order to minimise residual stresses in the structure thereby reducing the risk of dimensional changes during further manufacturing or final use of the component.

Benefits of Stress relieving

Machining, and cutting, as well as plastic deformation, will cause a build up of stresses in a material. These stresses could cause unwanted dimension changes if released uncontrolled, for example during a subsequent heat treatment. To minimise stresses after machining and the risk for dimension changes the component can be stress relieved.

Stress relieving is normally done after rough machining, but before final finishing such as polishing or grinding.

Parts that have tight dimensional tolerances, and are going to be further processed, for example by nitrocarburising, must be stress relieved.

Welded structures can be made tension free by stress relieving.

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Hydrogen brazing

Hydrogen brazing is a braze process that uses the cleaning (reducing) properties of high purity hydrogen to improve the flow characteristics of the braze alloy. The hydrogen atmosphere reduces surface oxides on the parent material, enabling the braze alloy to flow (wet) more effectively to create a high integrity braze joint.

Benefits of Hydrogen brazing

• Cleanliness – the reduction of surface oxides on the parent material improves the cleanliness and integrity of the braze joint.
• Increased braze alloy and parent material options – enables the use of high vapour pressure braze alloys and parent materials that cannot be brazed within a vacuum atmosphere.

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