Products Description
Product Specifications
| Standards | ASTM A358 / ASME SA358 |
| Steel Grades | 304 304L 304N 304LN 304H 309Cb 309S 310Cb 310S 316 316L 316N 316LN 316H 317 317L 321 347 347HC 348 XM-19 XM-29 |
| Equivalent Standards | DIN, JIS, GB, AISI, ISO |
| Outer Diameter (OD) | NPS 8" – 110" |
| Wall Thickness (WT) | Sch 10 – Sch 160 (≈3 mm – 100 mm) |
| Length | Up to 12 m or customized |
| Surface Treatment | Bright Annealed |
| Production Process | Electric Fusion Welded |
| Condition | Solution Annealed |
TP304 exhibits excellent resistance to general corrosion, as well as good formability and weldability. It is suitable for service temperatures ranging from -196°C to 800°C and is capable of withstanding exposure to atmospheric conditions, fresh water, mild acidic and alkaline media, and general chemical environments.
TP316 features a PREN (Pitting Resistance Equivalent Number) of ≥ 24, making it well-suited for environments involving seawater, brine, and chlorine-containing chemicals.
Astm A358 Tp304 316 Seamless Stainless Steel Tube utilizes a dual-pass Electric Fusion Welding (EFW) process; it is capable of withstanding high pressures (up to 16 MPa), thereby eliminating the risk of leakage of petrochemical media, and is ideally suited for high-hazard applications such as hydrocracking and high-pressure steam systems.
Customized Services
- TORICH offers customized sizing services and can perform full-penetration welding in accordance with the requirements of ASTM A358 Classes 1–5.
- We offer a range of surface treatments, including pickling and passivation, bright annealing, and mechanical polishing.
- We offer customized packaging services, including custom marking, stamping, and traceability labeling.
- We can provide customized connection options-such as flanged, grooved, or threaded connections-to reduce installation time.
Chemical Composition
| Element | C (%) | Mn (%) | Si (%) | P (%) | S (%) | Cr (%) | Ni (%) | Mo (%) |
|---|---|---|---|---|---|---|---|---|
| TP304 | ≤ 0.08 | ≤ 2.00 | ≤ 1.00 | ≤ 0.045 | ≤ 0.030 | 18.0 – 20.0 | 8.0 – 11.0 | - |
| TP316 | ≤ 0.08 | ≤ 2.00 | ≤ 1.00 | ≤ 0.045 | ≤ 0.030 | 16.0 – 18.0 | 10.0 – 14.0 | 2.0 – 3.0 |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HBW) |
| TP304 | ≥ 515 | ≥ 205 | ≥ 35 | ≤ 201 |
| TP316 | ≥ 515 | ≥ 205 | ≥ 35 | ≤ 217 |
Possible Alternative Grades
- Compared to TP304 and TP316, TP347 is better suited for long-term high-temperature service and is utilized in refinery heaters, converters, and high-temperature petrochemical pipelines.
- 904L is a high-alloy austenitic stainless steel that offers superior resistance to pitting and crevice corrosion compared to TP316; it is employed in acid plants, fertilizer production units, and seawater cooling systems.
- Alloy 600 retains its strength and corrosion resistance during short-term exposure to temperatures exceeding 1000°C; it is used in chemical reactors, furnace components, and high-temperature petrochemical equipment.
application areas
- In oil refineries: used for crude oil transport, refined product transport, hydrocracking systems, catalytic cracking systems, boiler superheaters/reheaters, and high-temperature steam pipelines;
- In petrochemical plants: used for chemical feedstock pipelines, pipelines for conveying acidic and alkaline media, connecting pipelines for chemical reactors, solvent transport pipelines, and condensate recovery pipelines;
- In offshore oil engineering: used for seawater cooling pipelines on offshore platforms, ship ballast water systems, and offshore oil and gas transmission pipelines.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: What are the main differences between ASTM A358 and ASTM A312?
A: The primary difference lies in the manufacturing process. ASTM A358 covers electric-fusion-welded (EFW) pipe, whereas ASTM A312 covers both seamless pipe and electric-resistance-welded (ERW) pipe (produced without the addition of filler metal). ASTM A358 allows for the production of larger diameters and features stricter wall thickness tolerances.
Q: How do you ensure that the product welds are fully fused and free from any risk of leakage?
A: We employ a dual-pass Electric Fusion Welding (EFW) process to ensure that the weld penetration depth is equal to or greater than 100% of the pipe's wall thickness. Furthermore, every single pipe undergoes 100% radiographic testing (RT) for flaw detection, followed by a post-weld solution annealing treatment.
Q: What surface finish options are available?
A: Products are typically supplied in a bright annealed condition; however, we also offer a range of additional surface treatments, including pickling and passivation, mechanical polishing (ranging from 180-grit to a 600-grit mirror finish), electropolishing, and sandblasting.
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