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| Brand Name: | Jinxi Pipe |
| Model Number: | Stainless steel pipe |
| MOQ: | 1 |
| Price: | 3000USD/TON |
| Payment Terms: | L/C,D/A,D/P,T/T,Western Union |
| Supply Ability: | 10000000 |
Specifications
ASTM A312 TP309S (UNS S30908) is the low carbon version of the alloy. It is utilized for ease of fabrication. 309H (UNS S30909) is a high carbon modification developed for enhanced creep resistance. It most instances the grain size and carbon content of the plate can meet both the 309S and 309H requirements.
| American Standard | Standard Name |
| A 312 / SA 312 | Seamless,Welded and Heavily Cold Worked Austenitic Stainless Steel Pipes |
ASTM A312 TP309S Stainless Steel Tube Chemical Composition
(Sources American Standard A312 / A312M TABLE 1 Chemical Requirements)
| Steel Grade | UNS Designation A | ASTM A312 TP309S Chemical Composition % Max | |||||||
| C | Mn | P | S | Si | Cr | Ni | Mo | ||
| TP309S | S30908 | 0.08 | 2 | 0.045 | 0.03 | 1 | 22.0-24.0 | 12.0-15.0 | 0.75 |
ASTM A312 TP309S Stainless Steel Tube Mechanical Properties
(Sources American Standard A312 / A312M TABLE 4 Tensile and Hardness Requirements)
| Steel Grade | UNS Designation |
Tensile Strength | Yield Strength | Elongation %, Min |
| Ksi (MPa), Min. | Ksi (MPa), Min. | |||
| TP309S | S30908 | 75(515) | 30(205) | 35 |
ASTM A312 TP309S Stainless Steel Tube Application
Key Distinction from TP309H:
TP309S vs. TP309H: While both offer excellent oxidation resistance, TP309S is chosen for its superior weldability and resistance to intergranular corrosion. TP309H is selected for its higher high-temperature strength and creep resistance but is more susceptible to sensitization in welded sections unless stabilized or solution annealed post-weld. TP309S is often used when post-weld heat treatment is not feasible.