UGIMA® 4305HM Solution Annealed

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UGIMA® 4305 HM is an improved machinability stainless steel manufactured only by Ugitech. Its properties are identical to those of 4305 except for its machinability, which is even better than that of 4305:

  • UGIMA® 4305 HM is the first stainless steel produced by the new method of inclusion population development and control, UGIMA® 2, perfected by Ugitech.
  • UGIMA® 4305 HM's technological advances are extremely advantageous, whatever the machining conditions, machine or tooling used.
  • Productivity increases of 50% over grade 4305, the current market standard, have been obtained. A comparison with our UGIMA® 4305, indicated a 25% increase in productivity.

  • Non-hardenable by heat treatment. Increased tensile strength and hardness is obtained by cold working.

    Non-magnetic in annealed condition.

    Slight magnetism is produced by cold-working operations

    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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    7.9 g/cm³

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    Elastic modulus

    196 GPa

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    50.0 - 65.0 %

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    Reduction of area

    60.0 - 75.0 %

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    Tensile strength

    570.0 - 650.0 MPa

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    Coefficient of thermal expansion

    0.0000168 1/K

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    20 to 200°C

    Specific heat capacity

    500 J/(kg·K)

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    Thermal conductivity

    15.3 W/(m·K)

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    Electrical resistivity

    7.3e-07 Ω·m

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    Chemical properties




    Show Supplier Material materials with Carbon of 0.07



    17.0 - 18.0 %

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    1.5 - 2.0 %

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    8.2 - 9.5 %

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    max., min: 5xC



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    0.25 - 0.35000000000000003 %

    Show Supplier Material materials with Sulfur of 0.25 - 0.35000000000000003 %

    Technological properties

    Application areas

  • General component production
  • Food-processing and agricultural industries
  • Decorating and household equipment
  • Building and construction, Transportation
  • Electronic equipment

  • Corrosion properties

    UGIMA® 4305 HM has excellent ability to withstand corrosion in many environments. Its corrosion resistance is typical of an austenitic steel and is similar to that of the 4305 / 303 in every respect.

  • The use of UGIMA® 4305 HM is compatible with all the fluids, lubricants, oils and greases used in the machining industry.
  • However, UGIMA® 4305 HM is not recommended for use in marine environments and highly oxidising chemical environments.
  • In addition, as with all resulphurised steels, special care must be taken when using UGIMA® 4305 HM in acid or chloride environments that are liable to pitting and crevice corrosion, it should not be used where components are shaped in such a way as to have areas where corrosive products might collect and corrode.
  • Optimum corrosion resistance is obtained where a surface is free from all traces of machining oil or foreign particles (of iron for example).

    UGIMA® 4305 HM is pickled in the same way as 304 grade steel. Decontamination of steels with a high sulphur content is not recommended owing to the complexity and cost of this operation; however, if it is necessary, the recommended decontamination / passivation process is as follows:

    1 volume 52% nitric acid (36° Baumé)

    1 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.

  • General machinability

    The performance of UGIMA® 4305 HM in machining is exceptionally good as a result of the optimisation of the inclusion population. This is true for very high speeds and severe cutting conditions, as a result of the UGIMA® process, but also for low speeds and less severe cutting conditions, because of the new improvements achieved through this latest development. UGIMA® 4305 HM is therefore particularly appropriate for screw machining, as its improved machinability is effective through an extensive range of cutting conditions and machining operations. Its performance is based on extremely good chip breakability, extended tool life and excellent surface finish. If you would like to use the grade to best advantage for your components and working environment, contact our Technical Service.

    Heat Treatment

    The annealing treatment that gives UGIMA® 4305 HM its lowest properties includes heating to 1000 - 1100°C, followed by rapid air or water cooling.

    Hot forming

    The forging of UGIMA® 4305 HM is not recommended. However, if this operation is indispensable, the material should be heated to 1175 - 1205° C, and the work should be finished at a temperature higher than 955°C


    Available products:

    ProductsShapeSurface finishToleranceDimension
    BarRoundRolled and descaled12 to1322 to 130 mm
    RoundTurned and polished9 to 1122 to 130 mm
    RoundDrawn8 to 91.8 to 55 mm
    RoundGround7 to 91.8 to 80 mm
    HexagonalDrawn113 to 55 mm
    Drawn wireRoundMat1 to 14 mm


    Like all stainless steels with a high sulphur content, UGIMA® 4305 HM is very difficult to weld, due to the almost inevitable phenomenon of thermal weld cracking. This is particularly true in the case of welding without the use of filler material. If a weld is required, it is recommended that ER312 welding wire be used as the filler metal to minimise thermal cracking problems. Heat treatment must not be performed after welding with ER312 wire.