UGIMA® 4570 Annealed

Want to keep this datasheet? Save it now in your required format


UGIMA® 4570 is an improved machinability stainless steel manufactured only by UGITECH. Its properties are identical to those of 303, except for its machinability, which is even better.

  • The SULPHUR + COPPER + UGIMA® Process synergy achieves previously unimaginable, but now unrivalled machining performances: cutting speed up to 750 m/min during turning with a coated carbide insert.
  • Similarly, this synergy provides improved chip breakability and tool life and increases productivity by up to 70% over 1.4305 (303) and 20% over UGIMA® 4305.
  • The addition of copper reduces sensitivity to cold work-hardening compared with 1.4305 and improves machining operations such as knurling, deep drilling, threading and tapping by rolling, as well as bending and crimping (door and cupboard handles).

  • Austenitic, therefore non-magnetic grade after annealing at 1000/1100°C (magnetic permeability µ < 1.03). The addition of 1.4/1.8 % of copper (gamma element) improves the stability of the grade even more, making it less susceptible to work-hardening phenomena and very highly suitable for applications requiring low levels of magnetic permeability (see graph on the right side of the material page).

    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.

    Ashby charts

    See where falls on the material property chart for against in your materials selection and design process. Our Ashby charts are interactive with more technical data upon clicking. Sign up to get access to this premium feature for free.





    7.9 g/cm³

    Show Supplier Material materials with Density of 7.9 g/cm³



    Elastic modulus

    193 GPa

    Show Supplier Material materials with Elastic modulus of 193 GPa


    55.0 - 60.0 %

    Show Supplier Material materials with Elongation of 55.0 - 60.0 %

    Reduction of area

    60.0 - 65.0 %

    Show Supplier Material materials with Reduction of area of 60.0 - 65.0 %

    Tensile strength

    570.0 - 620.0 MPa

    Show Supplier Material materials with Tensile strength of 570.0 - 620.0 MPa



    Coefficient of thermal expansion

    0.0000165 1/K

    Show Supplier Material materials with Coefficient of thermal expansion of 0.0000165 1/K

    20 to 200°C

    Thermal conductivity

    16.7 W/(m·K)

    Show Supplier Material materials with Thermal conductivity of 16.7 W/(m·K)



    Electrical resistivity

    7e-07 Ω·m

    Show Supplier Material materials with Electrical resistivity of 7e-07 Ω·m



    Relative magnetic permeability

    1.03 [-]

    Show Supplier Material materials with Relative magnetic permeability of 1.03 [-]


    Chemical properties



    0.04 - 0.08 %

    Show Supplier Material materials with Carbon of 0.04 - 0.08 %


    17.0 - 18.0 %

    Show Supplier Material materials with Chromium of 17.0 - 18.0 %


    1.4 - 1.8 %

    Show Supplier Material materials with Copper of 1.4 - 1.8 %


    1.5 - 2.0 %

    Show Supplier Material materials with Manganese of 1.5 - 2.0 %



    Show Supplier Material materials with Molybdenum of 0.5



    8.0 - 9.0 %

    Show Supplier Material materials with Nickel of 8.0 - 9.0 %



    Show Supplier Material materials with Phosphorus of 0.04




    Show Supplier Material materials with Silicon of 0.75



    0.25 - 0.35000000000000003 %

    Show Supplier Material materials with Sulfur of 0.25 - 0.35000000000000003 %

    Technological properties

    Application areas

  • Transport
  • Electronic equipment
  • Decorative use and household equipment
  • Corrosion properties

    Nitric acidGood
    Phosphoric acidAverage
    Sulphuric acidAverage
    Acetic acidAverage
    Sodium carbonateAverage
    NaCl (Saline mist)Average
    Sea waterRestricted use

    UGIMA® 4570 has excellent ability to withstand corrosion in many environments. Its corrosion resistance is typical of an austenitic steel and is slightly better than that of 1.4305 (303).

  • The use of UGIMA® 4570 is compatible with all the fluids, lubricants, oils and greases used in the machining industry.
  • However, UGIMA® 4570 is not recommended for use in marine environments and highly oxidising chemical environments.
  • In addition, as with all high sulphur steels, special care must be taken when using UGIMA® 4570 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® 4570 is pickled in the same way as 303 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 test piece.
  • General machinability

    The performance of UGIMA® 4570 in machining is exceptionally good, as a result of the sulphur + copper UGIMA® synergy. This is true for very high speed or severe cutting conditions, as a result of the UGIMA® process, but the addition of copper reduces sensitivity to cold hardening by machining and is beneficial for machining operations such as knurling, deep drilling (>4xD) and threading and tapping by rolling.

    The cutting conditions shown in the tables on the right side of the material page are those which we established in the trial phase of the development of UGIMA® 4570. If you would like to use the grade to best advantage for your components and working environment, contact our Technical Service.


  • The use of coated tools will increase the useful life of tools by 20% to 50% under equal cutting conditions, or it will improve cutting conditions by 10% to 15% for tools with the same service life.
  • A TiN PVD coating is recommended.
  • See the tables on the right side of the material page.


  • The cutting lubrication quality is very important. It must be ample (sufficient pressure and flow) and even. In the case of large drill diameters, it is best to use oil-hole drills (internal lubrication).
  • The cutting conditions given are valid for a drilling depth equal to a maximum of 4 x f.
  • It is preferable to use drills with a nose angle of approximately 118°.
  • Lubricant

    Lubricants with high-pressure additives are recommended.


  • It is preferable to use coatings with a visible top layer of TiN, which is generally gold in colour, for the type of coated carbide inserts indicated.

  • Warning: Although the cutting conditions indicated in this data sheet are derived from machining tests carried out in our laboratories and on our customers' premises, they must be adapted to suit the machine, tools and cutting lubricant used. Under no circumstances can UGITECH be held responsible for any damage that may occur through the use of the cutting parameter values listed above.

    Hot forming


    UGIMA® 4570 should not be forged. 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:

  • Hot rolled and descaled bars (tol. 13)
  • Cold-finished drawn, turned, ground bars (tol. 6 to 11)

    Other products: contact the supplier


    Like all stainless steels with a high sulphur content, UGIMA® 4570 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.