317L stainless steel pipe (also known as UNS S31703 and 317L SS pipe) is a low-carbon, high-grade stainless steel pipe, which means it has better corrosion resistance and mechanical working performance. This material is composed of elements such as iron, chromium, nickel and molybdenum. The content of chromium, nickel and molybdenum has increased compared with 316L stainless steel pipe, making it superior to 304L and 316L stainless steel.
Compared to 317L, 317 stainless steel has a higher carbon content, which gives it better heat resistance. However, its corrosion resistance is slightly lower than 317L.
The corrosion resistance of 317L stainless steel pipe is similar to that of 316L stainless steel. Specifically, the high molybdenum content ensures better overall and local corrosion capabilities against most media such as sulfuric acid, acid chlorine and phosphoric acid. The chemical content of chromium, nickel, and molybdenum in 317L stainless steel pipes increases by 2%, 1%, and 1% respectively compared to 316L stainless steel pipes. These elements play a decisive role in the performance of stainless steel pipes. In terms of pitting corrosion resistance, 317L stainless steel performs better than 304L and 316L stainless steel.
The performance of 317L steel pipe is basically the same as that of 317 stainless steel pipe. Due to the lower carbon content, the welding performance and intergranular corrosion resistance of 317L stainless steel pipes at high temperatures (427~816°C) are better than those of 317 stainless steel pipes. Improved welding performance means that the material is more easily joined or joined during the manufacturing process, while improved intergranular corrosion resistance means that the material is less prone to intergranular corrosion in high-temperature environments, thus prolonging its service life.
Chemical Composition of ASTM TP 317L Steel Pipe
|
Carbon |
Mn |
P |
S |
Si |
Cr |
Ni Nickel |
Mo |
|
0.030 max |
2.00 max |
0.045 max |
0.030 max |
1.00 max |
18.0–20.0 |
11.0–15.0 |
3.0–4.0 |
Dimensional Tolerances for ASTM TP 317L Steel Pipes
|
OD |
OD Tolerance |
Wall Tolerance |
|
≤ .500" |
± .005" |
± 10% |
|
.500" – 1.5" excl |
± .005" |
± 10% |
Size Range for ASTM TP 317L Steel Pipes
|
Outside Diameter (OD) |
Wall Thickness |
|
.125" – 1.000" |
.028" – .134" |
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