TOBO STEEL GROUP CHINA
| Purpose | Chemical Industry |
| Ends | Plain End (PE), Beveled End (BE) |
| Payment Terms | T/T,Western Union |
| Surface | Pickling Annealed |
| External Diameter | 6mm-800mm |
| Execution Standards | GB,JIS,ASTM,URS,KS,BS,EN,AS |
| Supply Ability | 10 Ton/Month |
| Product Name | Heavy Wall Thick Stainless Steel Seamless Pipe ASTM A312 TP316L Large Diameter Seamless Tube |
| End Cut | Plain End ( PE ) / Bevel End ( BE ) |
| Delivery Time | 15-30 Workdays |
| Types | Stainless Steel Seamless Pipe / Tube |
| Supply Capacity | 10000tons |
| Tolerence | +-1% |
| Payment Term | T/T, L/C, Western Union, Etc. |
| Inspection | 100% |
| Processing Technology | Hot Rolled |
| Ndt | Eddy Current Or Hydraulic Test |
| Packaging Details | Standard Shipping Package |
| Thickness | 0.5-100mm |
| Material Grade | ASME S30400 |
| Model Number | Stainless Steel Seamless Pipe |
| Brand Name | TOBO |
| Certification | ISO/TUV/SGS |
| Place of Origin | Shanghai,China |
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Product Specification
| Purpose | Chemical Industry | Ends | Plain End (PE), Beveled End (BE) |
| Payment Terms | T/T,Western Union | Surface | Pickling Annealed |
| External Diameter | 6mm-800mm | Execution Standards | GB,JIS,ASTM,URS,KS,BS,EN,AS |
| Supply Ability | 10 Ton/Month | Product Name | Heavy Wall Thick Stainless Steel Seamless Pipe ASTM A312 TP316L Large Diameter Seamless Tube |
| End Cut | Plain End ( PE ) / Bevel End ( BE ) | Delivery Time | 15-30 Workdays |
| Types | Stainless Steel Seamless Pipe / Tube | Supply Capacity | 10000tons |
| Tolerence | +-1% | Payment Term | T/T, L/C, Western Union, Etc. |
| Inspection | 100% | Processing Technology | Hot Rolled |
| Ndt | Eddy Current Or Hydraulic Test | Packaging Details | Standard Shipping Package |
| Thickness | 0.5-100mm | Material Grade | ASME S30400 |
| Model Number | Stainless Steel Seamless Pipe | Brand Name | TOBO |
| Certification | ISO/TUV/SGS | Place of Origin | Shanghai,China |
| High Light | Stainless Steel Seamless Pipe ASTM A312 ，Thick Wall Seamless Steel Tube ，Large Diameter TP316L Pipe | ||
Heavy Wall Thick Stainless Steel Seamless Pipe ASTM A312 TP316L Large Diameter Seamless Tube
1.Product Description
This technical data sheet covers austenitic (304/304L, 316/316L), stabilized (321, 347H), duplex (2205, 2507), and super-austenitic (904L) stainless steel seamless pipes manufactured by hot extrusion and cold finishing processes. The pipes are supplied in the solution-annealed and pickled condition, with no longitudinal or helical welds throughout the entire length. Each pipe is 100% non-destructively tested (UT + ET) and accompanied by an EN 10204 Type 3.1 or 3.2 Mill Test Certificate. Dimensional tolerances meet or exceed ASTM A530 / A999 requirements, with precision-grade options available upon request. End finishes include plain, beveled (37.5°±2.5°), or threaded, with rust-preventive oil and plastic end caps as standard.
2. Product Applications
These seamless pipes are designed for critical services in the following industries and systems:
Oil & gas upstream (downhole tubing, surface flowlines, subsea umbilicals)
Refinery and petrochemical high-temperature/high-pressure process piping
Power generation – superheater/reheater tubes in coal-fired and combined-cycle plants
Nuclear power – secondary/tertiary cooling circuits (seismic-grade)
LNG terminals and cryogenic storage (–162°C transfer lines)
Desalination and seawater handling (duplex grades for chloride resistance)
Pharmaceutical and biotechnology – purified water / WFI distribution (hygienic finishes)
Semiconductor and photovoltaic – ultra-high-purity gas and chemical delivery
Hydrogen production and refueling stations – high-pressure (350–700 bar) piping
3. Product Advantages
Weld‑free integrity — eliminates weak points, reduces leakage risk, and provides uniform mechanical properties in both longitudinal and transverse directions.
Superior pressure containment — allows higher allowable stresses (joint coefficient E = 1.0 per ASME B31.3) compared to welded pipes, enabling up to 15% wall thickness reduction.
Excellent corrosion resistance — alloy-specific resistance to general corrosion, pitting, crevice corrosion, SCC, and intergranular attack, verified by ASTM A262 practices.
High-temperature creep strength — stabilized grades (347H) offer exceptional creep rupture strength up to 750°C, with 100,000‑hour rupture data available.
Cryogenic toughness — austenitic grades maintain impact energy >60J at –196°C with no ductile‑to‑brittle transition.
Smooth internal surface — Ra ≤ 0.8μm (polished) reduces flow resistance, fouling, and bacterial growth.
Full traceability — each pipe is stamped with heat number and pipe ID, fully integrated into ERP for 30‑minute data retrieval.
Customizable supply — non‑standard ODs, wall thicknesses, and lengths available; certified to ASME, PED, NORSOK, and class society rules.
4.Key Product Parameters
| Parameter | 304/304L | 316/316L | 321 | 347H | 2205 | 904L |
| OD Range (mm) | 6 – 660 | 6 – 660 | 6 – 426 | 6 – 426 | 10 – 610 | 10 – 426 |
| WT Range (mm) | 0.5 – 60 | 0.5 – 50 | 0.5 – 40 | 0.5 – 40 | 1.0 – 40 | 1.0 – 30 |
| Max. Service Temp. (℃) | 425 | 425 | 650 | 750 | 300 | 400 |
| Allowable Stress @100℃ (MPa) * | 115 | 115 | 120 | 135 | 190 | 110 |
| Allowable Stress @400℃ (MPa) * | 85 | 85 | 90 | 105 | — | — |
| Tensile Strength (MPa) min. | 520 | 520 | 550 | 550 | 620 | 490 |
| Yield Strength (MPa) min. | 205 | 205 | 205 | 205 | 450 | 220 |
| Elongation (%) min. | 40 | 40 | 40 | 35 | 25 | 35 |
| Hardness (HB) max. | 187 | 187 | 187 | 192 | 290 | 220 |
| Coeff. of Expansion (20–400℃) ×10⁻⁶/℃ | 17.2 | 17.5 | 17.0 | 17.8 | 13.5 | 15.5 |
| Thermal Conductivity @100℃ (W/m·K) | 16.2 | 16.3 | 16.1 | 16.5 | 19.0 | 13.0 |
| Critical Pitting Temp. (℃, 6%FeCl₃) | <10 | 20 | 15 | 20 | 45 | 65 |
| SCC Resistance (chlorides) | Poor | Medium | Medium | Medium | Excellent | Good |
| Intergranular Corrosion (ASTM A262) | Practice E | Practice E | Practice C/E | Practice C/E | N/A | Practice C |
| NDT Standard | UT per ASTM E213, ET per ASTM E571 — 100% coverage | |||||
| Hydrostatic Test | Calculated per ASME B31.3; hold ≥10s; zero leakage | |||||
| Straightness | Total bow ≤0.15% of length; ≤3.0mm over any 3m | |||||
| OD Tolerance (Precision Grade) | ±0.05mm for D<50mm; ±0.5% for D≥50mm | |||||
| WT Tolerance | ±8% ~ ±10% (precision); ±10% ~ ±12.5% (standard) | |||||
| Surface Roughness (internal, polished) | Ra ≤0.8μm | |||||
| Recommended Filler (GTAW) | ER308L | ER316L | ER321 | ER347 | ER2209 | ER385 |
| PWHT Requirement (WT>10mm) | Optional (solution 1050℃) | Optional | Stabilizing 870–930℃ | Stabilizing 900–950℃ | Not recommended | Not recommended |
FAQ
1. Are you trading company or manufacturer ? We are manufacturer ,You can see the certification.
2.How long is your delivery time? Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
3. Do you provide samples ? is it free or extra ? Yes, we could offer the sample for free charge but need pay the cost of freight.
4. What is your terms of payment ? Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
Company Details
Business Type:
Manufacturer,Agent,Importer,Exporter,Trading Company,Seller
Year Established:
1998
Total Annual:
100000-100000000
Employee Number:
200~300
Ecer Certification：
Verified Supplier
TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ... TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area ...
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