Seamless and Welded Stainless Steel Pipe 304L/316L/321 - China Suppliers and Factory Direct Quality Products
Detailed Description of Stainless Steel Pipe
The performance of stainless steel pipe is achieved through its alloy composition. Specifically, the chromium in the alloy forms a thin, inert, and tenacious passive film on the surface. If the film is damaged, either mechanically or chemically, it will quickly reform in the presence of oxygen, offering continuous protection.
Grade 304 is the most widely used "18/8" stainless steel and provides good corrosion resistance in a wide variety of circumstances. Grade 316 is for more extreme conditions (the presence of chlorides for example) or marine environments, because it has molybdenum in the alloy, which greatly improves its resistance to pitting and crevice corrosion.
Pipe can be obtained in either seamless, which has maximum integrity for pressure, or welded, which can be a less expensive option with very good quality stemming from the advancements in manufacturing techniques.
Key Parameters for Stainless Steel Pipe
| Parameter | Details |
|---|---|
| Manufacturing Process | Seamless (Hot/Cold Finished) Welded (ERW, TIG) |
| Standards | ASTM A312 ASTM A269 ASTM A778 EN 10216-5 EN 10217-7 |
| Austenitic Grades | 304 304L 316 316L 321 310S |
| Duplex Grades | 2205 (S32205) 2507 (S32750) |
| Size Range (OD) | 6mm – 630mm (1/8" – 24") |
| Wall Thickness (WT) | Schedule 5S 10S 40S 80S |
| Length | Usually 6m, or as required |
| Surface Finish | No. 1 – Hot rolled, annealed, pickled 2B – Cold rolled, bright No. 4 – Brushed #8 – Mirror |