Products Description
Product Specifications
| Standards | ASTM A312 / ASME SA312 |
| Steel Grades | TP 321,or TP XM-19 TP XM-10 TP XM-11 TP XM-15 TPXM-29 TP304 TP 304L TP304H TP304LN TP309S TP309H TP310S TP316 TP316L TP316LN TP317 TP347 TP347H TP348 TP904L,etc. |
| Equivalent Standards | EN X6CrNiTi18-10,DIN 1.4541,JIS SUS321,GOST 08Х18Н10Т |
| Outer Diameter (OD) | 6mm-610mm(1/4"- 24") |
| Wall Thickness (WT) | 0.5mm-55mm(0.02"- 2 1/8") |
| Length | 6-12m, or customized |
| Surface Treatment | Pickled,Bright annealed |
| Production Process | Cold drawn,Hot Extrusion |
| Condition | Solution Annealed |
321 stainless steel is a Ni-Cr-Ti type austenitic stainless steel, primarily utilized in the manufacture of corrosion-resistant industrial equipment operating in high-temperature environments ranging from 500°C to 800°C.
When 304 stainless steel is exposed to temperatures within the range of 425°C to 815°C (particularly between 550°C and 800°C), carbon diffuses toward the grain boundaries, where it combines with chromium to form chromium carbides. 321 stainless steel is a modification of 304 stainless steel involving the addition of titanium (Ti); this addition facilitates the formation of stable MC-type carbides (TiC), which effectively minimizes the formation of chromium carbides, thereby enhancing the material's resistance to intergranular corrosion and improving its high-temperature performance.
The stainless steel seamless pipes produced by TORICH Sa 312 Tp 321 Ss Stainless Steel Pipe Supplier undergo solution heat treatment following cold drawing to relieve residual deformation stresses and refine the material's microstructure. The recommended continuous service temperature for 321 stainless steel is approximately 870°C (maximum), while the recommended intermittent service temperature is approximately 925°C (maximum).
Customized Services
- In addition to the standard range of outer diameters (1/4" to 24") and wall thicknesses (0.02" to 2 1/8"), TORICH offers custom manufacturing services for specialized pipe diameters and wall thicknesses.
- TORICH provides custom fabrication services for various shapes, including U-type, S-type, and spiral configurations.
- We also offer customized packaging services-including multi-layer corrugated cardboard, plastic film, and wooden crates-as well as custom logo branding services.
Chemical Composition
| Element | Carbon | Manganese | Silicon | Phosphorus | Sulfur | Chromium | Nickel | Titanium |
| TP321 | ≤ 0.08 | ≤ 2.00 | ≤ 0.75 | ≤ 0.045 | ≤ 0.030 | 17.0 – 19.0 | 9.0 – 12.0 | ≥ 5 × C, ≤ 0.70 |
Mechanical Properties
| Property | Tensile Strength | Yield Strength | Elongation | Hardness |
| Value | ≥ 515 MPa | ≥ 205 MPa | ≥ 35% | ≤ 95 |
Physical Properties
| Property | Density | Melting Range | Thermal Conductivity | Specific Heat Capacity | Modulus of Elasticity |
| Value | 7.93 g/cm³ | 1398 – 1446 °C | 16.2 W/m·K (at 100 °C) | 500 J/kg·K | ~193 GPa |
Possible Alternative Grades
- For applications involving more demanding high-temperature environments, TP 347 / 347H is a suitable choice; it offers superior creep resistance compared to TP 321 and requires no specialized post-weld heat treatment to prevent intergranular corrosion.
- For piping systems on offshore oil platforms, duplex stainless steels such as S31803 / S32205 are recommended, as they possess approximately twice the strength of TP 321 while offering excellent corrosion resistance.
- If the application is limited to low-to-moderate temperature environments, TP 304 / 304L stainless steel is a viable option, suitable for use within a temperature range of -200°C to 425°C.
application areas
321 stainless steel is utilized in chemical and petrochemical equipment involving welding and high-temperature processes-such as high-temperature piping, vessels, and reactors.
It is also employed in outdoor machinery within the chemical, coal, and petroleum industries where high resistance to intergranular corrosion is required; in heat-resistant components for construction materials; and in parts that present difficulties during heat treatment. Specific applications include: exhaust gas combustion piping in the petroleum industry; engine exhaust manifolds; boiler casings, heat exchangers, and heating furnace components; muffler components for diesel engines; boiler pressure vessels; and chemical transport tankers.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: Which offers superior high-temperature resistance: 310S or 321 stainless steel?
A: 310S is suitable for use in boilers, hot-blast furnaces, and industrial furnace tubes, capable of withstanding temperatures as high as 1200°C. 321 stainless steel is suitable for temperatures below 800°C and is ideal for environments requiring corrosion resistance at moderate to high temperatures.
Q: How does TP321 seamless stainless steel tubing perform in terms of corrosion resistance within the petrochemical sector?
A: TP321 is capable of withstanding the complex media environments commonly encountered in the petrochemical industry-including acids, alkalis, salts, and corrosive gases.
Q: What customized surface treatment services are available?
A: In addition to mechanical polishing, mirror polishing, and electropolishing, we offer high-temperature-resistant coatings-such as ceramic coatings and high-temperature silicone-based paints-which are suitable for use in cracking furnace tubes and heating furnace pipelines within petrochemical facilities.
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