UGIMA® 4542

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UGIMA® 4542 is the first UGIMA® steel product from the family of improved machinability, precipitation hardened stainless steels. It is manufactured only by UGITECH. Its properties are identical to those of UGI 4542 except for its machinability which is significantly better than that of UGI 4542:

  • UGIMA® 4542 has new technological advances bring significant advantages over grade 1.4542.
  • Productivity increases of 20 to 30% are obtained compared with grade UGI 4542.

    This stainless steel is unique in that it not only offers excellent corrosion resistance, comparable to that of type 1.4301/1.4307 (304/304L) austenitic stainless steels, but it also offers a wide range of mechanical properties once treated.

    Its performance - based on its metallurgical condition - means that it can meet demands for high levels of tensile strength as well as being suitable for applications that require high impact strength.

    The microstructure is martensitic with some ferrite stringer. Depending on the metallurgical condition some retained austenite and copper precipitates can be part of the microstructure.

  • Related Standards

    Equivalent Materials

    This material data has been provided by Ugitech SA.

    "Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
    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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    7.75 g/cm³

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    Elastic modulus

    197 GPa

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    Hardness, Brinell


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    max., EN 10088-3

    Hardness, Rockwell C


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    max. ASTM A564

    Tensile strength


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    max. ASTM A564, EN 10088-3



    Coefficient of thermal expansion

    1.08e-05 1/K

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    Thermal conductivity

    17 W/(m·K)

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    Electrical resistivity

    7.7e-08 Ω·m

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    Coercive force

    3420.0 A/m

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    Relative magnetic permeability

    38 [-]

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    at 200Oe and 100Oe respectively

    59 [-]

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    at 200Oe and 100Oe respectively

    Chemical properties




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    15.0 - 16.5 %

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    3.0 - 4.0 %

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    Show Supplier Material materials with Manganese of 1.0




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    4.0 - 5.0 %

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    Show Supplier Material materials with Niobium of 0.45

    max., min: 5xC



    Show Supplier Material materials with Phosphorus of 0.03




    Show Supplier Material materials with Silicon of 0.6000000000000001




    Show Supplier Material materials with Sulfur of 0.03


    Technological properties

    Application areas

    UGIMA® 4542 is suitable for:

  • Leisure marine craft (propeller shafts, fittings)
  • Food processing (handling and transfer equipment)
  • Energy production (atomic power plants)
  • Construction and the automotive industry
  • Corrosion properties

    UGIMA® 4542 offers excellent corrosion resistance, similar to that of type 18 Cr-8Ni austenitic steels in most corrosive environments. The structure of this steel makes it insensitive to intergranular corrosion and highly resistant to fatigue-corrosion as well as to stress corrosion. Furthermore, excellent resistance to corrosion-erosion should be noted due to the association of high level mechanical properties and corrosion resistance. When assemblies of stainless steel and less noble materials (aluminium, mild steel) are applied in atmospheric use, there is no risk of galvanic corrosion, the absence of any environmental electrolyte making it impossible for this phenomena to develop and spread. In "critical" cases like those met in nautical applications (short term immersion of stainless steel/aluminium assemblies, areas and dips that retain liquids), insulating the assemblies using an inert silicon seal offers good results in terms of protection against this kind of corrosion.

    If necessary, the following decontamination treatment process is recommended:

  • One volume of 52% nitric acid (36° Baumé)
  • One volume water
  • Ambient temperature
  • Short duration
  • Wash carefully when the process is completed

  • The corrosion resistance of a stainless steel depends on many factors related to the composition of the corrosive atmosphere (chloride concentration, presence or absence of oxidising agents, temperature, pH, agitation or no agitation, 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 sample. The table below illustrates a performance scale in different environments:

    Nitric acidGood
    Phosphoric acidRestricted use
    Sulphuric acidRestricted use
    Acetic acidAverage
    Sodium carbonateAverage
    NaCl (Saline mist)Good
    Sea waterRestricted use
    Oil/gasRestricted use

    General machinability

    The performance of UGIMA® 4542 in machining is enhanced as a result of the optimization of the inclusion population

    Heat Treatment

    To ASTM A564/A564M and EN10088-3

    After annealing from 1030°C to 1050°C, UGIMA®4542 presents a soft martensitic structure with a hardness of around 35 HRC. After annealing, if the metal is to be used in this condition, we recommend an expansion treatment lasting one to two hours at 250/300°C, with no significant effect on its mechanical properties.

    This precipitation hardening steel is specific in that it can be hardened, after annealing, using a medium temperature hardening treatment. The maximum hardness, of around 42 HRC (impact strength of 3 daJ/cm²) is obtained by tempering to around 480° C (for one hour).

    Softening: by tempering at 550-760°C depending on the instructions defined by the applicable standards. To harden the metal after this kind of softening, the metal needs to be annealed once again before performing the medium temperature hardening treatment.

    The annealed bars are suitable for medium temperature hardening, performed on parts. Parts taken from softened bars must, to harden, be subject once again to an annealing operation, then to the medium temperature hardening treatment.

    Hot forming

    UGIMA® 4542 is suitable for forging. Reheating takes place between 1150 and 1200°C, forging between 1200°C and 950°C. Cooling in air, water or oil. The parts obtained in this way can be used:

  • Annealed (with an expansion treatment lasting 1 to 2 hours at 250°/300°C), or
  • Hardened (with optional annealing + tempering for one hour at 480°C), or
  • Softened (with optional annealing + tempering defined by the standards according to the desired level of mechanical properties).

  • Other

    Available products:

    Hot rolled and descaledRound bars13
    Cold – finished bars11 to 8

    Do not hesitate to contact the supplier for further information


    UGIMA® 4542 can be welded, without preheating, using MIG and TIG techniques, with or without the use of filler material, or by laser, resistance or electron beam techniques.

    Welds, whether made with or without a filler material, have an annealed structure and should preferably be subject to expansion treatment (one to two hours at 250°C/300°C) or hardening or softening treatment (see above).

    For welding performed with no filler material or with a homogeneous filler material, the welding mechanical properties obtained in this way can be identical to that of the base metal.

    Furthermore, it should be restated that the welding design should make allowance for the care required with all high steels with high proof stress: avoiding cut outs and sudden changes in cross section.

    Welding with a filler material: For MIG welding, we recommend the use of a protective gas made up of Ar+1%CO₂ or 1-2%O₂; gasses containing H₂ and N₂ should be avoided. The welding wire used as filler metal can be ER308LSi (1.4316) or a homogeneous filler called 630 (17-4PH)