321H Stainless Round Pipes UNS S32109
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S32109 steel pipe is a stainless steel material that is austenitic stainless steel and has excellent corrosion resistance and oxidation resistance. The main components of this material are chromium, nickel, molybdenum and copper, among which the chromium content reaches 21%, so it is called S32109 stainless steel.
In the chemical composition of 321H stainless steel pipe, the chromium content is between 17% and 20%, the molybdenum content does not exceed 3%, and the titanium content is between 5 and 10 times. The addition of these elements greatly enhances the corrosion resistance of 321H stainless steel round pipes. For example, at a high temperature of 600°C, the corrosion resistance of stainless 321H pipe is more than 5 times that of 304 stainless steel!
S32109 stainless steel thick-walled pipe is characterized by its high-temperature corrosion resistance and high-temperature strength, so it is not prone to deformation and failure due to corrosion when used at high temperatures. At the same time, this stainless steel material also has very good oxidation resistance and can effectively resist gas and ion erosion, so it will not rust easily after long-term use in the air.
Stainless Steel UNS S32109 Pipes Equivalent Grades
| Grade | 321H | |
| UNS No | S32109 | |
| Old British | BS | 321S51 |
| En | – | |
| Euronorm | No | 1.4878 |
| Name | X10CrNiTi18-10 | |
| Swedish SS | – | |
| Japanese JIS | SUS 321H | |
ASTM A312 UNS S32109 Pipes Mechanical Properties
| Grade | UNS S32109 | |
|---|---|---|
| Tensile Strength (MPa) min | 515 | |
| Yield Strength 0.2% Proof (MPa) min | 205 | |
| Elongation (% in 50mm) min | 40 | |
| Hardness | Rockwell B (HR B) max | 95 |
| Rockwell B (HR B) max | 217 | |
UNS S32109 Pipes

The weldability of 321H stainless steel is very good. Users can choose different welding methods such as TIG, MIG, arc welding, etc., and no special treatment is required.
S32109 stainless steel acid-resistant pipe has high strength and corrosion resistance, and is especially suitable for use in high temperature and acid-base environments. It is widely used in chemical, oil and gas and petrochemical industries to manufacture industrial equipment such as storage tanks, containers and pipelines.

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