Grade 420 stainless steel is a highcarbon steel
Apr 13, 2026
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Key Properties
The following properties are mentioned for bar products in ASTM A276. The specification may not necessarily be similar for other forms, such as forgings and plate.
Composition
The compositional ranges of grade 420 stainless steels are given in following table:
Table 1 - Compositional ranges of grade 420 stainless steels
|
Grade |
C |
Mn |
Si |
P |
S |
Cr |
|
|
420 |
min. max. |
0.15 - |
- 1 |
- 1 |
- 0.040 |
- 0.03 |
12.0 14.0 |
Mechanical Properties
The key mechanical properties of grade 420 stainless steels are tabulated below:
Table 2 - Mechanical properties of grade 420 stainless steels
|
Tempering Temperature (°C) |
Tensile Strength (MPa) |
Yield Strength |
Elongation (% in 50mm) |
Hardness Brinell (HB) |
Impact Charpy V (J) |
|
Annealed * |
655 |
345 |
25 |
241 max |
- |
|
204 |
1600 |
1360 |
12 |
444 |
20 |
|
316 |
1580 |
1365 |
14 |
444 |
19 |
|
427 |
1620 |
1420 |
10 |
461 |
# |
|
538 |
1305 |
1095 |
15 |
375 |
# |
|
593 |
1035 |
810 |
18 |
302 |
22 |
|
650 |
895 |
680 |
20 |
262 |
42 |
|
* Annealed tensile properties are typical for Condition A of ASTM A276; annealed hardness is the specified maximum. |
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Physical Properties
The table below provides the physical properties of grade 420 stainless steels in their annealed state:
Table 3 - Physical properties of annealed grade 420 stainless steels
|
Grade |
Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Coefficient of Thermal Expansion |
Thermal Conductivity |
Specific Heat 0-100°C |
Electrical Resistivity (nΩ.m) |
|||
|
0-100°C |
0-315°C |
0-538°C |
at 100°C |
at 500°C |
|||||
|
420 |
7800 |
200 |
10.3 |
10.8 |
11.7 |
24.9 |
- |
460 |
550 |
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