UGI 4404FGX3 Drawn Bar

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UGI 4404FGX3 is a molybdenum austenitic stainless steel belonging to the 316L family. Its low carbon content provides good corrosion resistance on welded areas. In addition, UGI 4404FGX3 has good machinability properties.

UGI 4404FGX3 has a mainly austenitic microstructure with traces of residual ferrite (1 to 3%).

UGI 4404FGX3 is an austenitic grade and therefore practically non-magnetic after annealing treatment (relative permeability close to 1). Slight ferromagnetic behaviour can however be observed due to the presence of residual ferrite and/or strain-induced martensite after cold working the metal (for example after drawing).

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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Charpy impact energy, V-notch

100 J

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Elastic modulus

20 °C

200 GPa

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100 °C

194 GPa

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200 °C

186 GPa

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300 °C

179 GPa

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30 %

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Hardness, Brinell

150.0 - 220.0 [-]

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Reduction of area

60.0 %

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Tensile strength

550.0 - 800.0 MPa

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Coefficient of thermal expansion

0.000016 1/K

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20 to 100°C

0.0000165 1/K

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20 to 200°C

0.000017 1/K

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20 to 300°C

Specific heat capacity

500 J/(kg·K)

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Thermal conductivity

15 W/(m·K)

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Electrical resistivity

7.5e-07 Ω·m

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Chemical properties




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16.5 - 18.5 %

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2.0 - 2.5 %

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11.0 - 13.0 %

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0.01 - 0.02 %

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Technological properties

Application areas

  • Mechanical industry
  • Chemical industry
  • Oil and petrochemical industry
  • Food-processing and agri-food industries
  • Medicine, Pharmaceuticals
  • Decorating and household equipment
  • Building
  • Corrosion properties

    UGI 4404FGX3 has very good corrosion resistance, as is the case with the entire 316 family; it can be used:

  • in the water industry (valves, etc.),
  • for outdoor exposure in rural, urban and industrial environments, even in the known presence of chloride ions (near the sea),
  • in the food processing and agri-food industries (compatibility with cleaning and disinfectant liquids),
  • and in the chemical industry (sulphuric, phosphoric and organic acids) under certain temperature and concentration conditions.
  • UGI 4404FGX3 withstands intergranular corrosion well, even after welding, and passes standard tests:

  • AFNOR NFA05-159,
  • ASTM A262 – 75 PRACTICE E,
  • DIN 50914,
  • and, on request, specific tests.

    Optimum corrosion resistance is obtained where a surface is free from all traces of machining oil or foreign particles (of iron for example).

    UGI 4404FGX3 is pickled and decontaminated in the same way as 1.4404 grade steel (316L).

    Reminder: 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 oxidizing 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). Experimental precautionary measures should also be taken for certain tests, such as the salt spray test (ISO 9227): 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

    With a sulphur percentage of approximately 0.015% and a controlled sulphide inclusion population, UGI 4404FGX3 offers good machining performance, but without achieving the exceptional machinability levels of UGIMA® 4404HM.

    Heat Treatment


    Heat treatment of UGI 4404FGX3 consists in quenching the metal in water or air after keeping it for a long time at a high temperature of between 1000 and 1100°C. This heat treatment which is known as annealing removes all traces of work-hardening and prevents chromium carbide precipitation, whilst giving the steel its lowest level of mechanical properties (Rm between 500 and 650 MPa) and good corrosion resistance.

    Hot forming


    There are no particular problems associated with forging UGI 4404FGX3. Heating without any special precautions up to 1150-1200°C.

    Forging between 1200°C and 950°C (the best behaviour being obtained between 1100 and 1200°C).

    Air or water cooling, if no deformation is feared (priority will be given to WATER cooling for large charges; avoid cooling stacked forgings in air)


    Available products:

    ProductShapeFinishingToleranceDimensions (mm)


    Rolled descaledk13Ø 13 to 130
    Turned10+11Ø 22 to 130
    Ground7+8+9+optionsØ 2 to 130
    Drawn9Ø 2 to 30
    Black bar+/- 1% of øØ 23 to 135
    HexagonalDrawn10+11Hex 3 to 55
    Wire rod
    RoundRolledØ 5 to 32
    Rolled pickledØ 5 to 32
    HexagonalRolled pickledHex 12.4 to 28
    BilletSquareAs rolled or as-heat-treated50 to 120

    Other: contact also the supplier


    There are no particular difficulties with welding UGI 4404FGX3 by electric arc processes (MIG, TIG, coated electrodes, plasma, submerged arc, etc.), resistance welding, friction welding, electron beam welding, etc.

    In addition, thanks to an analytical balance allowing primary ferritic solidification under standard arc welding conditions, the risk of thermal cracking inherent in austenitic stainless steels is very low. Only LASER welding can, under certain conditions, cause a phenomenon of thermal cracking of heat-affected zones (HAZ).

    If a filler metal is used, the following filler grades are recommended: E316L (coated electrodes), ER316L (TIG), ER316LSi (MIG). No heat treatment is necessary after welding. However, if a guaranteed non-magnetic property is required when welding UGI 4404FGX3 without the use of filler material, ferrite regression heat treatment in the HAZ could be advantageous.