Nitriding Steels

Nitriding Steels are heat-treatable steels which, owing to their nitride-forming additions (aluminium, chromium, molybdenum), are particularly suited for gas nitriding and tufftriding.

Nitriding steels are employed for components which are subjected to heavy wear and severe pressures; they must exhibit high surface hardness and good core strength. The improved surface hardness and wear resistance impart outstanding sliding and running properties to the steel parts. Heavy compressive stresses within the nitrided surface layer considerably improve fatigue strength.

Maximum hardness of the nitrided case (900-1200 HV) can be attained in aluminium alloyed steels. For steels containing chromium and molybdenum, the obtainable case hardness is in the range of 750-1100 HV.

High-tensile alloy steels, pre-hardened alloyed plastic mould tool steels, and hardened and tempered hot work tool steels can be gaseous nitrided/nitro-carburised. Some stainless steels can be plasma/ion nitride.

 

Product Overview Availability Datasheet
4140 4140 / 42CrMo4 /1.7225

For applications requiring high tensile strength and toughness values, in particular in small medium cross sections. 4140 is the most commonly used of the high tensile steels with a wide range of applications in automotive, Gear and Engine construction, Crankshafts, Steering knuckles, Connecting rods, Spindles, Intermediate gears, Pump and Gear shafts, Axles, Nuts and Bolts.  

Bright Rounds

Diameter tolerance h9

ø6mm - ø80mm 

Rounds

(rolled/forged/machined)

25mm - 550mm diameter

Overseas Stocks

560mm - 1000mm diameter

 

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4340 1.6582/ 34CrNiMo6

Nickel, Chromium, Molybdenum steel for applications requiring high tensile strength and toughness values, particularly in large cross sections. Higher tensile and yield strength than 4140. Components for the aircraft, automotive and general engineering industries eg. Propeller shafts, connecting rods, gear shafts, and other automobile shafts. Heavy forgings eg: Rotors, shafts, discs. 

NZ Stock

Rounds

Rolled/forged/rough machined

ø25mm - ø500mm 

Overseas Stock

520mm - 700mm diameter

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Uddeholm Impax Supreme P20 + Ni / 1.2738

Pre-hardened steel with high purity levels, a good uniform structure and hardness, even in large section sizes over 400mm. This results in good toughness and polishability. Supplied hardened and tempered at a suitable operating hardness for shafts, crank shafts, and general engineering. Can be Nitrided or hard Chrome plated for extra resistance. 

NZ Stock

Rounds 

ø 12.7mm - 600mm 

Plates

20mm - 150 mm thick

Blocks

160mm - 500 mm thick

 

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Bohler M238 P20+Ni / 1.2738

Pre-hardened ( Tensile strength approximate 1000 MPa; hardness about 300 HB) mould steel with high purity levels, a good uniform structure and hardness, even in large section sizes over 400mm. This results in good toughness and polishability. Supplied hardened and tempered at a suitable operating hardness. Can be nitrided or hard Chrome plated for extra wear resistance. Good photoetching properties. Suitable for injection moulds and extrusion dies for plastics. Forming tools, press brake dies (with nitriding or local flame hardening) and machinery components, such as shafts, bolts and gears

NZ Stock

Rounds 

ø 12.7mm - 600mm 

Plates

20mm - 150 mm thick

Blocks

160mm - 500 mm thick

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Uddeholm Orvar 2M H13 / 1.2344

Suitable for application requiring high toughness, with good wear resistance and compressive strength. Suitable for shafts, Pistons, Pins, Bushes, Thrust washers, down hold drilling tools, high stress linkages.

Note: Material is supplied in the annealed condition. Heat treat to appropriate condition to suit intended application. 

NZ Stock

Rounds

ø10mm - ø508mm

Flats / Blocks 

25mm - 305 mm thick

 

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Bohler W302 Isodisc H13 / 1.2344

Suitable for heavy duty hot work tools and dies: mainly for light alloy die casting applications. Hot extrusion tools, hot shear blades. Can also be used for plastic moulding dies and Engineering components/Parts requiring good toughness and torsional characteristics (after appropriate heat treatment processing).

NZ Stock

Supplied in the annealed condition.

Rounds

ø10mm - ø508mm

Flats / Blocks 

25mm - 305 mm thick

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Uddeholm Orvar Supreme H13 ESR / 1.2344 ESR

Premium Cr-Mo-V alloyed hot work steel with good resistance to thermal fatigue. This steel is produced by a special melting and refining technique and meets the requirements of NADCA #207-2008.

Overseas Stock

Rounds

10mm - 550 mm diameter

Flats/Blocks

28mm - 407 mm thick

 

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Uddeholm Vidar 1 ESR ~H11 ESR / 1.2343 ESR

Used for plastic moulding, specially large moulds requiring high toughness and polishability, and general hot work applications (shear blades, forging dies, hot gripper dies, extrusion tooling). Containing less vanadium than the widely used H13 grade tool steel giving a higher toughness, with some reduction in wear and temper resistance. Possessing good resistance to heat checking (thermal fatigue) and thermal shock. 

NZ Stock

Flats

10mm - 230mm thick 

Overseas Stock

Blocks

254mm - 600mm thick

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Uddeholm Bure

Intended for applications demanding high temperature strength, toughness and temper resistance. Resistance to abrasion good at both low and high temperatures. Suitable for making tool holders and engineering components such as highly stressed drive shafts and transmission parts, conveyor rollers carrying hot parts, clamp jaws especially at elevated temperature.

NZ Stock

Rounds

ø16mm - ø70mm

Overseas Stock

Rounds ( pre-hardened)

22mm-41mm

Rounds (annealed)

11.9mm -180mm diameter

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Bohler M261

BÖHLER M261 EXTRA is a precipitation-hardening steel grade for plastic moulds, featuring excellent machinability in the as-supplied condition (Hardness 38-42 HRC), i.e. solution annealed and aged, condition. There is no need for an additional heat treatment, significantly shortening the throughput time.

NZ Stock

Rounds

30.5mm - 202mm diameter

Overseas Stock

Rounds

16mm - 262.5mm diameter

Flat

603 x 303mm

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Bohler M461

BÖHLER M461 EXTRA is a precipitation-hardening steel grade for plastic moulds, featuring excellent machinability in the as-supplied, i.e. solution annealed and aged, condition (Hardness 38 -42 HRC).

It has excellent nitriding properties and is suitable for making engineering components. 

NZ Stock

Rounds

Diameter 121.5mm

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