SS309 Seamless Tubes
Alloy 309 stainless steel is a high-alloy stainless steel that contains high chromium and nickel and has good high temperature resistance and corrosion resistance. It is mainly used in high-temperature equipment and pipelines. The corresponding grades of 309 stainless steel pipes are: SUS309, UNS S30900.
309S is a grade under the American ASTM standard, equivalent to the old Chinese grade 0Cr23Ni13 or the new Chinese grade S30908. The "S" usually represents low carbon content, which is one of the keys to understanding its performance. Low carbon means that this material has a lower tendency to precipitate carbides under welding or high-temperature environments, thus better maintaining its resistance to intergranular corrosion.
Chemical Composition of 309 and 309S stainless steel pipe
|
Grades |
C |
Si |
Mn |
P |
S |
Cr |
Ni |
|
309 |
0.20 |
1.00 |
2.00 |
0.045 |
0.03 |
22.0-24.0 |
12.0-15.0 |
|
309S |
0.08 |
1.00 |
2.00 |
0.045 |
0.03 |
22.0-24.0 |
12.0-15.0 |
Mechanical Property of 309 and 309S seamless steel pipe
|
Grades |
Finish |
Tensile strength, min,Mpa |
Yield strength, min,Mpa |
Elongation in 2in. |
|
309 |
Hot finished/Cold finished |
515 |
205 |
30 |
|
309S |
TP 309 and 309s SS Hollow Pipe
What are the differences between 309S stainless steel and the more common 304 stainless steel?
304 stainless steel is a more widely used austenitic stainless steel, with a lower chromium and nickel content (18-20% chromium, 8-10.5% nickel) than 309S (approximately 22-24% chromium, 12-15% nickel). This difference in composition directly leads to differences in performance. 309S generally outperforms 304 stainless steel in terms of high-temperature resistance and corrosion resistance, especially in continuous operating temperatures. 304 is mostly used in normal or medium-temperature corrosive environments, such as food equipment, kitchenware, and building decoration; while 309S is more geared towards high-temperature applications. Simply put, if the application environment temperature is high, 304 may not be suitable, and in such cases, high-alloy materials like 309S need to be considered.
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