Steel gradesAISI 310, AISI 3...1.4935, X20CrMoW...

1.4935, X20CrMoWV12-1, AISI 422 - creep resisting steel

1.4935, X20CrMoWV12-1, AISI 422 - creep resisting steel, data according to EN 10088-3:2014 and EN 10302

Standard Grade
Chemical composition %
C: Si: Mn: P: S: Cr: Mo: Ni: V: W: Cu:
EN 1.4935, X20CrMoWV12-1
0.17-0.24 0.1-0.5 0.3-0.8 <0.025 <0.015 11.0-12.5 0.8-1.2 0.3-0.8 0.25-0.35 0.4-0.6 -
JIS SUH616
0.20-0.25 <0.5 0.5-1.0 <0.04 <0.03 11.0-13.0 0.75-1.25 0.5-1.0 0.2-0.3 0.75-1.25 <0.3
ASTM AISI 422 / AISI 616 - S42200
0.20-0.25 <0.75 <1.0 <0.04 <0.03 11.0-12.5 0.75-1.25 0.5-1.0 0.15-0.30 0.75-1.25 <0.5

1.4935, X20CrMoWV12-1 – description

Creep resistant steel used for thermal engine components in power plants, mainly turbine blades, but fasteners as well. Hardenable. Max temperature for continous operating is 580 °C.

Chrome-nickel steel with an austenitic structure with carbides. Alloying additions of molybdenum, vanadium and tungsten increase the melting temperature, thus having a positive effect on creep resistance.

The steel is hard to weld. It is assigned to welding group 7.2 according to ISO/TR 20172.

Physical and mechanical properties

1.4935 - physical properties and indicative mechanical properties:

  • Density: 7.7 g/cm3
  • Linear expansion coefficient: 10.5-12.5 *10-6m/(m*K)
  • Thermal conductivity: 24 W/(m*K)
  • Specific heat capacity: 460 J/(kg*K)
  • Young's modulus: 216 GPa
  • Electrical resistivity: 0.6 µΩ*m
  • Tensile strength Rm: > 600 MPa
  • Creep limit for max elongation 0.2% Rp0.2: > 800 MPa
  • Creep-rupture strength Ru: > 275 MPa; 500 °C; 100000 h

Creep limit for max elongation 0.2% Rp0.2 - high temperature test:

  • Testing temperature: 400 °C - > 420 MPa
  • Testing temperature: 500 °C - > 335 MPa

Mechanical properties of +QT700 class forgings:

  • Ambient temperature:
    • Re: > 500 MPa
    • Rm: 700-850 MPa
    • A: 15 %
  • Yield strength Re in high temperature:
    • Testing temperature: 50 °C - > 465 MPa
    • Testing temperature: 100 °C - > 460 MPa
    • Testing temperature: 150 °C - > 445 MPa
    • Testing temperature: 200 °C - > 430 MPa
    • Testing temperature: 250 °C - > 415 MPa
    • Testing temperature: 300 °C - > 390 MPa
    • Testing temperature: 350 °C - > 380 MPa
    • Testing temperature: 400 °C - > 360 MPa
    • Testing temperature: 450 °C - > 330 MPa
    • Testing temperature: 500 °C - > 290 MPa
    • Testing temperature: 550 °C - > 250 MPa

Mechanical properties of +QT800 class forgings:

  • Ambient temperature:
    • Re: > 600 MPa
    • Rm: 800-950 MPa
    • A: 14 %
  • Yield strength Re in high temperature:
    • Testing temperature: 50 °C - > 585 MPa
    • Testing temperature: 100 °C - > 560 MPa
    • Testing temperature: 150 °C - > 545 MPa
    • Testing temperature: 200 °C - > 530 MPa
    • Testing temperature: 250 °C - > 505 MPa
    • Testing temperature: 300 °C - > 480 MPa
    • Testing temperature: 350 °C - > 450 MPa
    • Testing temperature: 400 °C - > 420 MPa
    • Testing temperature: 450 °C - > 380 MPa
    • Testing temperature: 500 °C - > 335 MPa
    • Testing temperature: 550 °C - > 280 MPa

Heat treatment and working

Recommended working and heat treatment parameters for 1.4935 alloy:

  • Quenching: 1020-1070 °C
  • Tempering: 680-780 °C

We deliver this steel alloy as:

  • Forgings
  • Rods

Replacements, equivalents and other designations:

1.4935, X22CrMoWV12-1, SUH616, 20VNiWMoCr120, AISI 422, AISI 616, S42200, EW 4935, T502, 56B.I.; DE 4935, HWMoV3, Grade 616

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