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