ASTM 440B is a high carbon chromium stainless steel combining stainless steel properties with excellent hardness after heat treatment. 440B can achieve a hardness of up to 58 Rockwell HRc. ASTM 440B stainless steel has similar corrosion resistance properties to type 410 stainless, with optimum cossision resistance of 440B achieved with a temper below about 400°C. For ASTM 440B steel to achieve best corrosion resistance, surfaces must be free of scale, lubricants, foreign particles, and coatings applied for drawing and heading. Due to its high carbon content 440B annealed stainless machines similar to a high speed steel annealed grade
Composition ranges for 440B grade stainless steels
|
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
N |
|
|
440A |
min. max. |
0.65 0.75 |
- 1.00 |
- 1.00 |
- 0.040 |
- 0.030 |
16.00 18.00 |
- 0.75 |
- |
- |
|
440B |
min. max. |
0.75 0.95 |
- 1.00 |
- 1.00 |
- 0.040 |
- 0.030 |
16.00 18.00 |
- 0.75 |
- |
- |
Mechanical properties of 440B grade 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 |
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