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AISI 440B | 1.4112 | X90CrMoV18 | Martensitic stainless steel

Material information according to DIN EN 10088 / DIN EN 10278

Stainless steel AISI 440B, also known as 1.4112 and X90CrMoV18, is a martensitic chromium steel with an increased carbon content. The material belongs to the magnetic steels and has an extremely high hardness and resistance to wear as well as good corrosion resistance. The material is characterised by very good polishability (mirror polishing is possible) and toughness. Stainless steel AISI 440B (1.4112, X90CrMoV18) has a tensile strength of 750-950 N/mm² and a yield strength (R p0.2) of 550 N/mm². This material should not be used for welding, but it has good forging properties. Typical applications for this stainless steel, also known as knife steel, include the manufacture of cutting tools such as various forms of knives (in this case knife blades and knife discs) and surgical instruments. This material is also used in the pump industry, toolmaking, the production of components in mechanical engineering and the manufacture of appliances in the food industry. This stainless steel should not be used for cold heading and is poorly suited to cold forming.

Please note that we can currently only offer rods for this material.

Specifications of the material

EN material number: 1.4112

EN abbreviation: X90CrMoV18

EN standard: 10278

Microstructure class: Martensite

Comparable standards and designations




SAE 440B

SIS 2319

UNS S44003

Chemical composition and properties of stainless steel 1.4112

0,85 - 0,95
17,00 - 19,00
0,90 - 1,30
0,07 - 0,12

Mass fraction in % according to DIN EN 10095

Physical properties

Magnetisability: good

Density (kg/dm³): 7.7

Thermal conductivity (at up to 20°C): 15

Specific heat at 20°C (J/kg K): 430

Modulus of elasticity kN/mm² at 20°C: 215

Electronic resistance at room temperature (in Ω mm²/m): 0.80


Stainless steel AISI 440B has very poor welding properties, as hardening cracks and stress cracks can occur if localised heating is too high. This material should therefore not be used for welding.


The material is suitable for forging. The forging process can take place between 1100°C and 800°C. Subsequent cooling is possible in the furnace or in the air.

Corrosion resistance

Due to its high chromium content, martensitic chromium steel AISI 440B/1.4112 has good corrosion resistance to non-chlorinated media such as water and water vapour in the quenched and tempered condition.

Soft annealing, stress-relieving annealing & hardening

Soft annealing: Soft annealing should be carried out in the temperature range of 780 - 840 °C. Subsequent cooling can be carried out in the air or in an oven.

Stress-relief annealing: Stress-relief annealing of this material is possible at 600°C - 650°C with subsequent cooling in the furnace.

Hardening: Stainless steel AISI 440B can be hardened in the temperature range of 1000°C - 1050°C. Cooling is possible in oil, in a hot bath or in the air.

Applications of stainless steel AISI 440B (1.4112)

Stainless steel AISI 440B (1.4112, X90CrMoV18) is used for various applications due to its specific properties. These include:

Knives and surgical instruments: Due to its hardness, toughness and corrosion resistance, stainless steel 1.4112 is often used for the production of high-quality knives, surgical instruments and medical devices.

Industrial knives and tools: In industry, stainless steel 1.4112 is used for the manufacture of cutting tools, knives, blades and other tools that require high strength and durability.

Ball bearings: Due to its good corrosion resistance and hardness, stainless steel 1.4112 is also used in the manufacture of ball bearings for various applications, including mechanical engineering, the automotive industry and aerospace.

Screws and bolts: In industries that require robust and corrosion-resistant fasteners, such as construction, shipbuilding and chemical plants, stainless steel 1.4112 is often used for the production of screws, bolts and other fasteners.

Food processing and catering: Due to its high resistance to acids and food juices, stainless steel 1.4112 is often used in food processing and catering, for example for knives, kitchen utensils and equipment in food production.

Chemical industry: In the chemical industry, stainless steel 1.4112 is used in systems and containers that are exposed to aggressive chemicals thanks to its excellent corrosion resistance and chemical resistance.

Please note

The information given in this data sheet has been compiled to the best of our knowledge and is based on the current version of the relevant standard. It is considered for reference only and we assume no liability for any errors.

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