Martensitic Stainless Steel
ALTA 1.4021 Stainless Steel Specification
Steel properties
ALTA 1.4021/20Cr13 is a high Chromium martensitic stainless steel. This steel have high strength and toughness, good corrosion resistance and machinability after quenching and tempering.
Applications
² Making parts that bear high stress loads, such as turbine blades, hot oil pump shafts and sleeves, impellers, hydraulic press valves, etc
² Also used in the paper industry and medical device, household appliances, tableware, etc
Chemical composition
Chemical Composition per %
|
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Cu |
Min. |
0.16 |
|
|
|
|
12.0 |
|
|
Max. |
0.25 |
1.00 |
1.00 |
0.030 |
0.030 |
14.0 |
0.25 |
0.30 |
Basic melting process : |
IM/EAF + LF + VD + (ESR) |
Hardness : |
Max 230 HB (annealed) |
Reduction ratio : |
5 : 1 minimum or required |
Grain size : |
≥ 5.0 per ASTM E112 |
Non-metallic inclusion : |
≤ 1.0 (thick), ≤ 1.5 (thin) per ASTM E45 method A (more pure by ESR route) |
Ultrasonic Test |
SEP1921, , EN 10308, ASTM A388 or agreed methods |
Macro-structure |
As per ASTM E381 |
Straightness / flatness |
≤ 1.5 mm / m (machined), ≤ 2.5 mm / m (black) |
Tolerance |
Per discussed |
Size range (round bars) |
Ø 12 - 600 mm |
Size range (flats, plates) |
8 - 450 mm in thickness max. 1100 mm in width |
Heat treatment
Annealing |
Temperature(°C) |
Hardness |
730 - 780 |
max. 230 HB |
Hot-forming |
Temperature(°C) |
800 - 1100 |
Hardening and tempering |
Quenching temperature(°C) |
Quenching medium |
Frequently-used tempering temperature(°C) |
900 - 1050 |
Oil |
600 - 750 |
Ac1 | Ac3 | Ar1 | Ar3 | Ms |
820 | 893 | 671 | 743 | 320 |
Coefficient of thermal conductivity : λ W/(m·K)
Temperature °C | 100 | 200 | 300 | 400 | 500 |
λ | 22.2 | 23.4 | 24.7 | 25.5 | 26.4 |
Coefficient of linear expansion : α(mm/(mm·°C))
Temperature °C | 20~100 | 20~200 | 20~300 | 20~400 | 20~500 |
Αx 10-6 | 10.50 | 11.00 | 11.00 | 12.00 | 12.00 |
Resistivity : ρ(Ω·m)
Temperature °C | 20 | 100 | 200 | 300 | 400 | 500 | 600 | 700 |
P x 10-6 | 0.64 | 0.69 | 0.76 | 0.83 | 0.91 | 0.97 | 1.04 | 1.08 |
Downloads
-
2024-06-14 Alta 1.4021 SPEC (011 - S6 - T1 ).pdf
끂41 265.29 KB
Features
² High strength and toughness
² Good corrosion resistance
² Good machinability
Copyright © 2024 Alta Special Steel all right reserved
News/Blog
- 2024-09-04
- 2024-08-31
- 2024-07-10
- 2024-06-14