UGIMA® 4057 QT800

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UGIMA® 4057 is a member of the UGIMA® family of improved machinability martensitic stainless steels. It is developed exclusively by Ugitech. Its properties are identical to those of 1.4057, except for its machinability which is even better than that of 1.4057:

  • UGIMA® 4057’s new technological advances are extremely advantageous and a great improvement on 1.4057.
  • productivity increases of between 10% and 20% over grade 1.4057 have been obtained. Such increases are more noticeable in the case of monobloc carbide drilling or when a carbide-tipped toolbit is used.

    In addition to excellent corrosion resistance, this stainless steel has the particular advantage of offering a wide range of mechanical properties in the processed condition. This grade also meets the requirements of EN10272 with respect to pressure vessels. Its performance - depending on its metallurgical condition - ensures compliance with high mechanical strength require-ments and meets the demands of applications where substantial resilience is needed.

  • Related Standards

    Equivalent Materials

    This material data has been provided by Ugitech SA.

    All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
    Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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    7.7 g/cm³

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    Charpy impact energy, V-notch

    20.0 - 25.0 J

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    min., depending on the size

    Elastic modulus

    23 °C

    215 GPa

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    100 °C

    215 GPa

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    12.0 - 14.0 %

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    min., depending on the size

    Tensile strength

    800.0 - 950.0 MPa

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    Coefficient of thermal expansion

    0.0000105 1/K

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    20 to 100°C

    Specific heat capacity

    460 J/(kg·K)

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    Thermal conductivity

    25 W/(m·K)

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    Electrical resistivity

    7e-07 Ω·m

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    Chemical properties



    0.16 - 0.2 %

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    15.5 - 17.0 %

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    0.015 - 0.03 %

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    Technological properties

    Application areas

    Process and energy industry, Chemical industry, Oil and petrochemical industries, Household and electrical appliance industry, Automotive and transport industry, Arms industry

    Corrosion properties

    This alloy has excellent atmospheric corrosion resistance and is one of the standard martensitic grades best able to withstand corrosion in marine environments; only structurally hardened grades such as UGIMA® 4542 have a higher re-sistance (amongst martensitic grades).

    UGIMA® 4057 is also resistant to certain petroleum and organic products.

    Environment Behaviour/ Use
    Nitric acid Good
    Phosphoric acid Restricted use
    Sulphuric acid Restricted use
    Acetic acidRestricted use
    Sodium carbonate Average
    NaCl (Saline mist ) Average
    Sea waterRestricted use

    Note: The corrosion resistance of a stainless steel depends on many factors related to the composition of the corro-sive atmosphere (chloride concentration, presence or absence of oxidising agents, temperature, pH, agitation or no agi-tation, and so on), as well as to the preparation of the material (surfaces free from metal particles, surface finish, such as hardening, polishing, and so on).

    Precautionary measures should be taken for certain tests such as the saline mist test (French standard NFX 41002), for example marking labels (that might cause corrosion run-outs and reduce the test resistance time) should not be used on the test pieces.

    In terms of pitting corrosion UGIMA® 4057 performs better than most martensiitic grades.

    General machinability

    The performance of UGIMA® 4057 in machining is exceptionally good, as a result of the optimisation of the inclusion population.

    Hot forming

    Forging: UGIMA® 4057 is suitable for forging. It is heated slowly to 850°C, then more quickly to 1150/1180°C for forging be-tween 1180°C and 950°C. Forging must be followed by a stress relief heat treatment at 200°C or softening at between 750 and 850°C or hardening and tempering


    Available products:

    Rolled and descaled bars12 to 1322 to 15 mm
    Turned and polished9 to 1122 to 115 mm
    Drawn bar8 to 93 to 55 mm
    Ground bar6 to 93 to 80 mm
    Drawn bar113 to 55 mm
    Wire rodRoundPickeled5.0 to 32 mm
    Drawn wireRound16.0 to 1.0 mm
    weight:normal;overflow:hidden;padding:1px 2px;text-align:center;vertical-align:top;word-break:normal">Drawn wire
    Round16.0 to 1.0 mm


    Provided certain precautionary measures are taken, UGIMA® 4057 can be subjected to most arc welding or resistance welding techniques in tempered, hardened or softened condition.

    To prevent any risk of cold weld cracking, UGIMA® 4057 must be preheated to between 200 and 300°C and the temper-atures between passes maintained at a minimum of 200°C. A stress relief heat treatment at 650°C is also required after welding.

    If a filler metal is needed, a wire with a similar composition to that of UGIMA® 4057, such as AWS E/ER410 is recom-mended. AWS E/ER310 austenitic wire can also be used if the mechanical properties on welding and the response of the welding to the post welding heat treatment are not required to be the same as those of the base metal.

    Ar + 1 to 3% CO₂ or O₂ shielding gases are recommended for MIG welding. Gas containing H₂ should not be used. Coated electrodes must be oven dried before welding.Heat treatment