1.4935, X20CRMOWV12-1, AISI 422 – CREEP RESISTING STEEL
Material 1.4935 High-temperature resisting steel and alloy. The material 1.4935 is a highly heat-resistant martensitic steel. This steel can be used up to a maximum temperature of about 650 °C / 1202 °F. Typical application for the turbine is 1.4935.
Standards
| HDIN / EN | US-Standard |
| X20CrMoWV12-1 | AISI 422 UNS S42200 |
Chemical Composition
| Standard | 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 | |
APPLICATIONS
Jet engine components
High temperature fasteners, springs
Non-magnetic cryogenic equipment
1.4935, X20CRMOWV12-1, AISI 422 – CREEP RESISTING STEEL, DATA ACCORDING TO EN 10088-3:2014 AND EN 10302
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
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
Machining Status
raw
Rough Turning
Finished
Processed according to technical drawing
