What is 1.4021 steel?
1.4021 steel, also known as X20Cr13, AISI 420, or 420A, is a martensitic stainless steel with good corrosion resistance in chloride-free, moderately corrosive media like freshwater, soap, and organic acids. It can be processed into a variety of practical product forms, including sheet, coil, tube, bar, and wire.
What material is 1.4021 equivalent to?
Stainless steel AISI 420 is a martensitic chromium steel that is also known under the designations 1.4021, BS 420S37, and X20Cr13. Due to its high chromium content, the material has good corrosion resistance (PREN value 12.0 - 14.0).
| EU EN |
USA - |
Germany DIN,WNr |
Japan JIS |
France AFNOR |
England BS |
China GB |
Sweden SS |
Poland PN |
Czechia CSN |
Russia GOST |
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| X20Cr13 |
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Properties and chemical composition of stainless steel AISI 420 / 1.4021
|
C |
Si |
Mn |
P |
S |
N |
Cr |
Cu |
Mo |
Ni |
Ti |
|---|---|---|---|---|---|---|---|---|---|---|
|
0,16 - 0,25 |
≤ 1,00 |
≤ 1,50 |
≤ 0,04 |
≤ 0,03 |
- |
12,0 - 14,0 |
- |
- |
- |
- |
Mechanical properties
|
Ø in mm |
WBZ |
HHB |
Rp0,2 in MPa |
Rm in MPa |
A5 in % |
AV in J |
|---|---|---|---|---|---|---|
|
≤ 160 |
QT800 |
- |
≥ 600 |
800 - 950 |
≥ 12 |
≥ 20 |
|
≤ 160 |
QT700 |
- |
≥ 500 |
700 - 850 |
≥ 13 |
≥ 25 |
Yield strengths at elevated temperature in the solution-annealed condition
|
Temp in °C |
QT |
100 °C |
150 °C |
200 °C |
250 °C |
300 °C |
350 °C |
400 °C |
|---|---|---|---|---|---|---|---|---|
|
Rp1,0 in Mpa |
+QT800 |
≥ 515 |
≥ 495 |
≥ 475 |
≥ 460 |
≥ 440 |
≥ 405 |
≥ 355 |
|
Rp0,2 in Mpa |
+QT700 |
≥ 460 |
≥ 445 |
≥ 430 |
≥ 415 |
≥ 395 |
≥ 365 |
≥ 330 |
Physical properties
Magnetisability: present
Density (kg/dm³): 7.7
Thermal conductivity (at up to 20°C): 30
Electrical resistance at room temperature (in Ω mm²/m): 0.6
Specific heat capacity (at up to 20°C): 460
Welding
AISI 420 / 1.4021 stainless steel is easy to weld. It can be processed using all common welding methods, such as TIG, MAG, and UP welding, but is not suitable for arc welding.
Be careful to avoid using gases containing nitrogen or hydrogen, as these can negatively affect the material's mechanical properties. Before welding, the material must be heated to between 100°C and 300°C. After welding, the material should be cooled to below 120°C and then tempered at approximately 650°C.
Heat Treatment and Hot Forming
Soft Annealing (+A) (slow cooling in a furnace or air): 745-825°C
Hot Forming (slow cooling in a furnace): 1100-800°C
Tempering (+QT) (cooling in air, oil, or polymer): 950-1050°C
Tempering (+QT700) (cooling in air, oil, or polymer): 650-750°C
Tempering (+QT800) (cooling in air, oil, or polymer): 600-700°C
Is 1.4021 magnetic?
1.4021 stainless steel is a martensitic grade of stainless. It is magnetic and hardenable with rust resistant properties.