Products Description
Product Specifications
| Standards | ASTM A312 / ASME SA312 |
| Steel Grades | TP XM-19 TP XM-10 TP XM-11 TP XM-15 TPXM-29 304 304L 304H 304LN 309S 309H 310S 316 316L 316LN 317 321 347 347H 348 904L,etc. |
| Equivalent Standards | EN 10216-5, JIS G3459, GOST 9941 |
| Outer Diameter (OD) | 6 mm – 630 mm |
| Wall Thickness (WT) | 0.5 mm – 55 mm |
| Length | 6/12 m |
| Surface Treatment | Annealed, Pickled, Passivated |
| Production Process | Cold drawing, cold rolling, TIG welding, solution annealing |
| Condition | Solution annealed |
Oil and gas processing plants require materials capable of withstanding alternating high and low temperatures as well as pressure fluctuations. Austenitic stainless steel pipe maintains stable mechanical properties across an operating temperature range of -196°C to 870°C, offering excellent impact and fatigue resistance.
Its austenitic microstructure provides superior ductility-with an elongation of 35% or greater-and allows on-site welding without preheating or post-weld heat treatment, thereby significantly shortening installation times. Furthermore, the inclusion of 2.0–3.0% molybdenum in TP316/316L grades enables resistance to stress corrosion caused by sulfides, carbon dioxide, and chloride ions in oil and gas environments.
Customized Services
- TORICH offers customization for non-standard dimensions, supporting seamless pipes with outer diameters up to 630mm and welded pipes up to 1800mm.
- Services include internal and external mirror polishing (Ra ≤ 0.4μm), precision wire drawing, matte sandblasting, and enhanced pickling and passivation.
- Processing capabilities include pipe bending, flaring, swaging, end beveling, end cap welding, and flange pre-assembly.
Chemical Composition
| Element (%) | C | Cr | Ni | Mo | Mn | Si |
|---|---|---|---|---|---|---|
| TP304L | ≤0.030 | 18.0–20.0 | 8.0–12.0 | - | ≤2.0 | ≤1.0 |
| TP316L | ≤0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | ≤2.0 | ≤1.0 |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRB) |
|---|---|---|---|---|
| TP304L | ≥485 | ≥170 | ≥35 | ≤90 |
| TP316L | ≥485 | ≥170 | ≥35 | ≤90 |
Possible Alternative Grades
- For high-temperature heat tracing or process discharge piping exceeding 400°C, TP321 or TP347 stainless steel may be selected to prevent chromium carbide precipitation during prolonged high-temperature exposure.
- For standard oil and gas process conditions involving mild corrosion, ambient temperatures, and low pressures, TP201 or TP302 stainless steels are suitable options; they offer a cost-effective alternative to TP304.
- For severe operating conditions-such as those involving high sulfur or chloride levels-904L ultra-high-purity austenitic stainless steel is an appropriate choice, as it withstands strong acids and high chloride-ion corrosion, making it suitable for highly corrosive process piping in oil and gas refining.
application areas
- Process piping, transmission lines, and separator piping in crude oil processing units
- Gas processing piping, dehydration unit piping, and compressor auxiliary piping in natural gas processing plants
- Chemical transfer piping, reactor piping, and process equipment connections in petrochemical units
- Cooling circuits, condenser piping, and heat exchanger connections in heat exchange systems
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Polishing equipment
Cold drawing equipment
Products Package
FAQ
Q: How should ASTM A269 seamless and welded pipes be selected for oil and gas applications?
A: Seamless pipes are preferred for high-pressure, highly corrosive, and core trunk pipeline networks; precision-welded pipes are suitable for medium-to-low-pressure, moderately corrosive, and auxiliary process piping.
Q: How is the weld quality of welded pipes ensured?
A: Welded pipes are produced using automatic tungsten inert gas (TIG) welding without filler material; post-welding, they undergo cold drawing and solution annealing across all specifications to ensure the microstructure of the weld seam matches that of the base metal. 100% eddy current or X-ray testing is available.
Q: What are the common surface treatments for process piping?
A: Annealing and pickling (AP) combined with external polishing are the most common methods; they provide effective surface passivation while ensuring an attractive and durable finish. For applications involving pure oxygen or high-purity media, Bright Annealing (BA) or electropolishing is recommended.
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