Grade 630 stainless steels plate are martensitic stainless steels that are precipitation hardened to achieve excellent mechanical properties. These steel achieve high strength and hardness following heat treatment. The heat and corrosion resistance of grade 630 fittings are similar to that of grade 304 steels. This grades is also commonly referred to as grade 17-4PH.
One of the key benefits of this grade is that it is available in solution treated conditions, at which they can be easily machined and age-hardened to attain high strength. The age treatment of grade 630 plate is carried out at low temperatures, to avoid significant distortion. Therefore, this grade is used for applications such as the manufacture of long shafts that do not require re-straightening after heat treatment. The properties mentioned below pertain to commonly available grade 630 bar products in ASTM A564. The specifications may not be similar to other forms such as forgings and plates.
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Grade |
C |
Mn |
Si |
P |
S |
Cr |
Ni |
Cu |
Nb+Ta |
|
630 |
min. max |
- 0.07 |
- 1 |
- 1 |
- 0.04 |
- 0.030 |
15 17.5 |
3 5 |
3 5 |
0.15 0.45 |
Condition |
Tensile Strength (MPa) |
Yield Strength 0.2% Proof (MPa) |
Elongation (% in 50mm) |
Hardness |
|
Rockwell C (HR C) |
Brinell (HB) |
||||
Solution Treated |
1105 typ |
1000 typ |
15 typ |
38 max |
363 max |
Condition 900 |
1310 min |
1170 min |
10 min |
40 min |
388 min |
Condition 1150 |
930 min |
724 min |
16 min |
28 min |
277 min |
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