Mat.No. 1.4112, DIN X90CrMoV18, AISI 440B

Mat.No. 1.4112, DIN X90CrMoV18, AISI 440B

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Designation by Standards Mat. No. DIN EN AISI 1.4112 X90CrMoV18 X90CrMoV18 440B Chemical Composition (in weight %) C Si Mn Cr Mo Ni V W Others 0.90 max. 1.0 max. 1.0 18.0 1.10 - 0.10 - - Description This is a high carbon martensitic stainless with moderate corrosion resistance good strength and the ability to obtain and keep excellent hardness (HRC 58) and wear resistance. Applications Ball bearings and races, gage blocks, molds and dies, cutlery, valve components, knives and ...


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    Designation by Standards

    Mat. No. DIN EN AISI
    1.4112 X90CrMoV18 X90CrMoV18 440B

    Chemical Composition (in weight %)

    C Si Mn Cr Mo Ni V W Others
    0.90 max. 1.0 max. 1.0 18.0 1.10 - 0.10 - -

    Description
    This is a high carbon martensitic stainless with moderate corrosion resistance good strength and the ability to obtain and keep excellent hardness (HRC 58) and wear resistance.

    Applications
    Ball bearings and races, gage blocks, molds and dies, cutlery, valve components, knives and measuring instruments. 

    Physical properties (avarage values) at ambient temperature
    Modulus of elasticity [103 x N/mm2]: 190-210
    Density [g/cm3]: 7.68
    Thermal conductivity [W/m.K]: 15.0 

    Coefficient of Linear Thermal Expansion 10-6 oC-1

    20-100oC 20-200oC 20-300oC 20-400oC 20-500oC 20-600oC 20-700oC 20-800oC
    9.8 10.5 10.9 11.2 11.3 11.3 11.5 11.8

    Continuous Cooling Transformation (CCT) Diagram

    Time-Temperature Transformation (TTT) Diagram


    Click the image to enlarge the diagram.

    Soft Annealing
    Heat to 810-860oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 265.

    Stress Relieving
    Stress relieving to remove machining stresses should be carried out by heating to 650oC, holding for one hour at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.

    Hardening
    Harden from a temperature of 1000-1050oC followed by oil quenching. Hardness after quenching is 56 HRC.

    Tempering
    Tempering temperature: up to 150oC.

    Tempering Temperature (oC) vs. Hardness (HRC)

    100oC 200oC 300oC 400oC 500oC 550oC 600oC 650oC 700oC
    56 54 52 53 54 51 40 33 29

    Tempering Diagram


    Click the image to enlarge the diagram.

    Forging
    Pre-heat to 760oC, then bring slowly up to 1038-1204oC before proceeding. Do not work this material below 927oC. Cool material slowly after working and once at room temperature, anneal fully. 

    Machinability
    Best machined in the annealed condition. Tough, stringy chips can be best handled by the use of chip breakers. Carbide or ceramic tooling is recommended.

    Corrosion Resistance 
    Resistant to a wide variety of media including fresh water, steam, petroleum products and alcohol.

    Welding 
    This alloy is not commonly welded due to its tendency to air harden. If it must be welded, preheat to 260oC and post weld treat at 732-760oC for 6 hours followed by a slow furnace cooling to avoid cracking.

    Cold working 
    This alloy is considered only slightly cold workable by common practices.

    Disclaimer
    The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.

     

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