Welded Pipes
Stable geometry and clean weld seam for industrial lines
Electric welded stainless steel pipes for food, chemical, and construction sectors.
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Core categories of stainless steel products
Seamless Pipes
High strength and reliability under pressure
Products for pipelines, heat exchangers, and units where load resistance is critical.
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Flanges
Precise fit and tight sealing performance
Slip-on, weld neck, and special flanges for piping systems of any complexity.
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Fittings
Elbows, tees, reducers, and connection components
Stainless components for process line assembly while keeping flow quality stable.
Open product pageTechnical tables
Pipe standards and chemistry
Technical data for welded and seamless pipes. Tables are provided in text form for easier reading and quick reference.
Available standards
| No. | Standard | Designation |
|---|---|---|
| 01 | GOST 9941 | Seamless cold and warm-deformed tubes made from corrosion-resistant steel |
| 02 | ASTM A312 | Spec for seamless, welded, and heavily cold worked austenitic stainless steel pipes |
| 03 | GB/T14976 | Stainless steel seamless tubes for fluid transport |
| 04 | GB/T14975 | Stainless steel seamless tubes for structures |
| 05 | GB 13296 | Stainless steel seamless tubes for boiler and heat exchanger |
| 06 | GB 9948 | Stainless steel tubes for petroleum cracking |
| 07 | GB 5310 | Stainless steel tubes and pipes for high-pressure boiler |
| 08 | GB/T21833 | Austenitic-ferritic (duplex) grade stainless seamless steel tubes and pipes |
| 09 | GB/T12771 | Welded stainless steel pipes for liquid delivery |
| 10 | ASTM A511 | Spec for seamless stainless steel mechanical tubing |
| 11 | ASTM A269 | Spec for seamless and welded austenitic stainless steel tubing for general service |
| 12 | ASTM A213 | Spec for seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes |
| 13 | ASTM A376 | Spec for seamless austenitic steel pipe for high-temperature central-station service |
| 14 | ASTM A789 | Spec for seamless and welded ferritic-austenitic stainless steel tubing for general service |
| 15 | G3459 | Seamless steel pipes |
| 16 | G3463 | Seamless steel boiler and heat exchanger tubes |
| 17 | EN 10297-2 | Seamless circular steel tubes for mechanical and general engineering purposes |
| 18 | EN 10216-5 | Seamless steel tubes for pressure purposes - technical delivery conditions |
| 19 | ASTM A688 | Spec for welded austenitic stainless steel feed-water heater tubes |
Grades, size ranges, and delivery status
| Item | Grade | Size range | Max length | Processing | Delivery status | Standard | Surface |
|---|---|---|---|---|---|---|---|
| Austenitic Stainless Steel | 304/L/H/LN, 316/L/H/LN/Ti, 321/H, 317/L/LN, 347/H, 310S/H, 309S | OD 6-38 × 0.5-6 mm; OD 42-168 × 2-30 mm; OD 219-325 × 3-45 mm; OD 377-764 × 5-60 mm | 14-38 m | Cold-rolled / Cold Drawn | Annealing | GB, ASME, ASTM, JIS, EN, DIN, GOST | Bright Tube, Pickling Passivation, Finishing Polish, Wire drawing |
| Super Austenitic Stainless Steel | N08904 (904L), S31254, S30432, S31042, N08367 (6Mo) | OD 12-325 × 0.8-20 mm | 12 m | Cold-rolled / Cold Drawn | Annealing | GB, ASME, ASTM, JIS, EN, DIN, GOST | Bright Tube, Pickling Passivation, Finishing Polish, Wire drawing |
| Super Duplex Stainless Steel | S31500, S32101, S32003, S32304, S31803, S32205, S32750, S32760 | OD 12-325 × 0.8-20 mm | 12 m | Cold-rolled / Cold Drawn | Annealing | GB, ASME, ASTM, JIS, EN, DIN, GOST | Bright Tube, Pickling Passivation, Finishing Polish, Wire drawing |
| High Temperature Nickel Alloy Pipe | N02200, N02201, N04400, N06600, N06690, N06625, N06985 (G3), N08028, N08800, N08810, N08811, N08825, N10276, N10624, N10629, N10675 | OD 12-325 × 0.8-20 mm | 12 m | Cold-rolled / Cold Drawn | Annealing | GB, ASME, ASTM, JIS, EN, DIN, GOST | Bright Tube, Pickling Passivation, Finishing Polish, Wire drawing |
Chemical composition comparison
| Grade | C | Mn | P | S | Si | Cr | Ni | Mo | Ti | N | Cu |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 347 | C ≤0.08 | Mn ≤2.00 | P ≤0.045 | S ≤0.03 | Si ≤1.00 | Cr 17.0-19.0 | Ni 9.0-12.0 | Mo — | Ti 10C-1.1 | N — | Cu — |
| 310S | C ≤0.10 | Mn ≤2.00 | P ≤0.045 | S ≤0.03 | Si ≤1.50 | Cr 24.0-26.0 | Ni 19.0-22.0 | Mo — | Ti 0.11 max | N — | Cu — |
| 316Ti | C ≤0.10 | Mn ≤2.00 | P ≤0.045 | S ≤0.03 | Si ≤1.00 | Cr 16.0-18.5 | Ni 10.0-14.0 | Mo 2.0-3.0 | Ti 5C-0.7 / ≥5C | N 0.10 max | Cu — |
| 2205 | C ≤0.03 | Mn ≤2.00 | P ≤0.035 | S ≤0.02 | Si ≤1.00 | Cr 21.0-23.0 | Ni 4.5-6.5 | Mo 2.5-3.5 | Ti — | N 0.08-0.22 | Cu — |
| 904L | C ≤0.03 | Mn ≤2.00 | P ≤0.045 | S ≤0.035 | Si ≤1.00 | Cr 19.0-23.0 | Ni 23.0-26.0 | Mo 3.0-5.0 | Ti — | N 0.04-0.15 | Cu 1.0-2.0 |
| 2507 | C ≤0.03 | Mn ≤1.20 | P ≤0.035 | S ≤0.020 | Si ≤0.80 | Cr 24.0-26.0 | Ni 6.0-8.0 | Mo 2.0-5.0 | Ti — | N 0.24-0.32 | Cu 0.5-1.0 |
GOST 9941-81 tolerance table
| Parameter | Standard precision | High precision | Extra high |
|---|---|---|---|
| By outside diameter 5-10 mm | ±0.3 mm | ±0.2 mm | ±0.15 mm |
| By outside diameter >10-30 mm | ±0.4 mm | ±0.3 mm | ±0.2 mm |
| By outside diameter >30-95 mm | ±1.2% | ±1.0% | ±0.8% |
| By outside diameter >95 mm | ±1.0% | ±1.0% | ±0.8% |
| By wall thickness 0.2 mm | ±0.05 mm | ±0.03 mm | — |
| By wall thickness 0.3-0.4 mm | ±0.07 mm | ±0.05 mm | — |
| By wall thickness 0.5-0.6 mm | ±0.10 mm | ±0.07 mm | — |
| By wall thickness 0.7-1.0 mm | ±0.15 mm | ±0.10 mm | — |
| By wall thickness >1-3 mm | +12.5 / -15.0 % | ±12.5% | +12.5 / -10.0 % |
| By wall thickness >3-7 mm | ±12.5% | +12.5 / -10.0 % | ±10% |
| By wall thickness >7 mm | +12.5 / -10.0 % | ±10% | — |
| Special notes | Normal | High |
|---|---|---|
| Broken line dimensions from table 1 (outside diameter) | +1.2% | +1.0% |
| Wall thickness 1.5-2.5 mm | +15% | +12.5 / -15.0 % |
| Wall thickness >2.5-4 mm | +12.5 / -15.0 % | +12.5% |
| Alloy 06XH28MDT, OD ≤30 mm | +0.45 mm | — |
| Alloy 06XH28MDT, OD >30 mm | +1.2% | — |
| Alloy 06XH28MDT, WT ≤3 mm | +15.0% | — |
| Alloy 06XH28MDT, WT >3 mm | +12.5% | — |
TP321 material reference
TP321 (12X18H10T / 08X18H10T / 06Cr18Ni11Ti). 321 stainless steel is a Ni-Cr-Mo type austenitic stainless steel. Due to titanium addition, it has enhanced intergranular corrosion resistance and elevated-temperature strength.
| Chemical composition | C (max) | Mn (max) | P (max) | S (max) | Si (max) | Cr | Ni | Ti | Cu (max) |
|---|---|---|---|---|---|---|---|---|---|
| GOST 12X18H10T | 0.12 | 2.00 | 0.035 | 0.02 | 0.8 | 17.0-19.0 | 9.0-12.0 | 5C-0.8 | 0.3 |
| GOST 08X18H10T | 0.08 | 2.00 | 0.035 | 0.02 | 0.8 | 17.0-19.0 | 9.0-12.0 | 5C-0.8 | — |
| GB 06Cr18Ni11Ti | 0.08 | 2.00 | 0.035 | 0.03 | 1.00 | 17.0-19.0 | 9.0-12.0 | 5C-0.7 | 0.3 |
| ASTM TP321 | 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 17.0-19.0 | 9.0-12.0 | 5C-0.7 | — |
| JIS SUS321 | 0.08 | 2.00 | 0.040 | 0.03 | 1.00 | 17.0-19.0 | 9.0-12.0 | ≥5C | — |
| DIN 1.4541 | 0.08 | 2.00 | 0.045 | 0.03 | 1.00 | 17.0-19.0 | 9.0-12.0 | 5C-0.7 | — |
| Mechanical properties | Value |
|---|---|
| Tensile strength σb (MPa) | ≥520 |
| Yield strength σ0.2 (MPa) | ≥205 |
| Elongation δ5 (%) | ≥40 |
| Reduction of area ψ (%) | ≥50 |
| Hardness | ≤187 HB / ≤90 HRB / ≤200 HV |
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