Grade 440 (UNS S44000) stainless steel
Feb 02, 2026
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Composition
The chemical compositions of various elements of grade 440 stainless steels are tabulated below:
Table 1. Chemical composition ranges of grade 440 stainless steels
|
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
N |
|
|
440A |
min. max. |
0.6 0.75 |
- 1 |
- 1 |
- 0.04 |
- 0.03 |
16 18 |
- 0.75 |
- |
- |
|
440B |
min. max. |
0.75 0.95 |
- 1 |
- 1 |
- 0.04 |
- 0.03 |
16 18 |
- 0.75 |
- |
- |
|
440C |
min. max. |
0.95 1.20 |
- 1 |
- 1 |
- 0.04 |
- 0.03 |
16 18 |
- 0.75 |
- |
- |
Mechanical Properties
Table 2. Mechanical properties of grade 440C stainless steels
|
Tempering Temperature (°C) |
Tensile Strength (MPa) |
Yield Strength 0.2% Proof (MPa) |
Elongation (% in 50mm) |
Hardness Rockwell (HR C) |
Impact Charpy V (J) |
|
Annealed* |
758 |
448 |
14 |
269HB max# |
- |
|
204 |
2030 |
1900 |
4 |
59 |
9 |
|
260 |
1960 |
1830 |
4 |
57 |
9 |
|
316 |
1860 |
1740 |
4 |
56 |
9 |
|
371 |
1790 |
1660 |
4 |
56 |
9 |
Possible Alternative Grades
Suitable alternatives to grade 440 stainless steels are listed in the table below:
|
Grade |
Reasons for choosing 440C |
|
440A/B |
Slightly softer and more corrosion resistant grade needed |
|
440F |
High machinability required, with same hardness and hardenability as 440C |
|
420 |
Lower strength and hardness needed than any of the 440 grades |
|
416 |
Higher machinability required, and the much lower hardness and strength is still adequate |
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