422, X20CrMoWV12-1, 1.4935, SUH 616, UNS 42200, B4B - Introduction and Application
422, X20CrMoWV12-1, 1.4935, SUH 616, UNS 42200 martensitic creep resistant stainless steel additional heavy metal alloying elements giving it good strength and temper resistance at higher temperatures up to 1200oF, Chrome-nickel steel with an austenitic structure with carbides. Alloying additions of molybdenum, vanadium and tungsten increase the melting temperature. Similar to the 410 stainless this grade has the ability to be heat treated to multiple different strength levels. Because of the temper resistance this alloy is often used in the power generation market as steam and gas turbine components or various other high heat components, mainly turbine blades and fasteners.
Melted process
AOD+ESR
EAF+LF+VD+ESR
BEF+ESR
422, X20CrMoWV12-1, 1.4935, SUH 616, UNS 42200, B4B - Chemical composition WT %
Grade
Chemical composition WT %
C
Si
Mn
P
S
Cr
Mo
Ni
V
W
Cu
X20CrMoWV12-1, 1.4935
0.17-0.24
0.1-0.5
0.3-0.8
Max 0.025
Max 0.015
11.0-12.5
0.8-1.2
0.3-0.8
0.25-0.35
0.4-0.6
-
SUH 616
0.20-0.25
Max 0.5
0.5-1.0
Max 0.04
Max 0.03
11.0-13.0
0.75-1.25
0.5-1.0
0.2-0.3
0.75-1.25
Max 0.3
ASTM AISI 422, AISI 616, S42200
0.20-0.25
Max 0.75
Max 1.0
Max 0.04
Max 0.03
11.0-12.5
0.75-1.25
0.5-1.0
0.15-0.30
0.75-1.25
Max 0.5
B50A951
Mechanical Property of 422, X20CrMoWV12-1, 1.4935, SUH 616, UNS 42200, B4B
Properties
Metric
Imperial
Elastic modulus
190-210 GPa
27557–30458 ksi
Poisson's ratio
0.27-0.30
0.27-0.30
Mechanical properties of Q+T 700 Forgings of 1.4935, X20CrMoWV12-1, 422, SUH 616, UNS 42200
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 Q+T 800 Forgings of 1.4935, X20CrMoWV12-1, 422, SUH 616, UNS 42200
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
Physical Property of 422, X20CrMoWV12-1, 1.4935, SUH 616, UNS 42200, B4B
Properties
Metric
Imperial
Density
7.8 g/cm3
0.2817 lb/in³
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
Heat Treatment of 422, X20CrMoWV12-1, 1.4935, SUH 616, UNS 42200, B4B
Quenching: 1020-1070 °C
Tempering: 680-780 °C
Welding of 422, X20CrMoWV12-1, 1.4935, SUH 616, UNS 42200, B4B
The steel is hard to weld. It is assigned to welding group 7.2 according to ISO/TR 20172.
Equivalent grades of 422, X20CrMoWV12-1, 1.4935, SUH 616, UNS 42200, B4B