630 Stainless Steel Pipe for Aerospace can achieve a tensile strength exceeding 1310 MPa through aging heat treatment (e.g., aging at 480°C), in accordance with ASTM A564. Its hardness can reach HRC 40–44, significantly higher than that of 304 stainless steel (tensile strength ≤700 MPa). Surface hardness can be further enhanced to HV 1000+ through nitriding or PVD coating, reducing wear and extending the service life of moving components such as pump shafts and piston rods. This makes it ideal for high-load structural parts such as aerospace fasteners and high-pressure valve stems.
In addition, Alloy 630 seamless pipe, after solution annealing and aging, exhibits uniform precipitation at grain boundaries. This microstructure provides a higher stress corrosion cracking (SCC) threshold in chloride-containing environments compared to 304, making it well-suited for chemical pressure vessels, nuclear steam piping, and other critical high-stress applications.
| Grade | Stainless Steel Alloy 630 / 17-4PH / UNS S17400 |
| Standards | ASTM A564 / A705, AMS 5568 (for pipe/tube) |
| Pipe Type | Seamless / Welded / Cold Drawn |
| OD Range | 6 mm – 219 mm |
| Wall Thickness | 0.5 mm – 20 mm |
| Delivery Condition | Solution Annealed + Aged (H900 / H1025 / H1150) |
|
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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Q.What are the standard specifications and implementation standards for 630 stainless steel pipes?
A.Specifications: The outer diameter range is usually 6-610mm, the wall thickness is 0.5-40mm, and it can be customized;
Implementation standards: ASTM A564 (seamless pipe), ASTM A731 (welded pipe), JIS G4305 (Japanese standard), etc.
Q.Is 630 stainless steel pipe magnetic?
A.Yes. After aging treatment, 630 is mainly martensitic structure and has obvious magnetism, which is different from the non-magnetic 304/316 austenitic stainless steel.
Q.How much higher is the price of 630 stainless steel pipe than 304?
A.Due to the complex composition (including copper and niobium) and heat treatment process, the price of 630 is usually 30%-50% higher than 304, depending on the specifications and purchase volume.
