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 17455,JIS G3459,ISO 9329-4,EN 10217-7 |
| Outer Diameter (OD) | 219 mm – 1800 mm |
| Wall Thickness (WT) | 0.5mm-55mm |
| Length | Up to 18 m or Customized |
| Surface Treatment | Pickled & Passivated |
| Production Process | EFW |
| Condition | Solution Annealed |
Through cold-drawing treatment, the inner wall roughness (Ra) of this large diameter welded stainless steel pipe is reduced to ≤1.6 μm; this results in low fluid resistance and makes the pipe highly resistant to scaling and clogging.
The piping material exhibits exceptional resistance to general corrosion and intergranular corrosion. Following welding, the entire length of the pipe undergoes solution treatment, resulting in grain refinement within both the weld seam and the heat-affected zone. Furthermore, the material has successfully passed intergranular corrosion tests in accordance with ASTM A262 Practice E (or the sulfuric acid–copper sulfate method).
Customized Services
- TORICH offers customized beveling services, providing standard 30° and 37.5° V-bevels, as well as J-type and U-type compound bevels; we can also pre-fabricate flanged pipe assemblies.
- We provide a comprehensive range of surface treatments, including pickling and passivation, internal weld grinding, mechanical polishing, and glass bead blasting.
- We support custom orders for non-standard, ultra-large diameters (up to 110″) and extra-thick wall thicknesses (up to 60mm), and can produce pipes in any specific cut-to-length size ranging from 3 to 18 meters, as required.
Chemical Composition
| Element | Carbon | Manganese | Silicon | Phosphorus | Sulfur | Chromium | Nickel | Molybdenum |
| 304 | ≤0.08 | ≤2.00 | ≤1.00 | ≤0.045 | ≤0.030 | 18.0–20.0 | 8.0–11.0 | - |
| 304L | ≤0.035 | ≤2.00 | ≤1.00 | ≤0.045 | ≤0.030 | 18.0–20.0 | 8.0–12.0 | - |
| 316 | ≤0.08 | ≤2.00 | ≤1.00 | ≤0.045 | ≤0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 |
| 316L | ≤0.035 | ≤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 (HRB) |
| 304/304L | ≥515 | ≥205 | ≥35 | ≤90 |
| 316/316L | ≥515 | ≥205 | ≥35 | ≤90 |
Possible Alternative Grades
- For ultra-high-temperature applications-such as those found in refinery high-temperature heating furnaces and exhaust gas systems-Grade 310S is the preferred choice, capable of operating stably at temperatures exceeding 1000°C.
- For piping systems continuously exposed to the sensitization temperature range of 400°C to 800°C-and for which full post-weld heat treatment is not feasible-Grades 321 and 347/347H are recommended for their excellent resistance to intergranular corrosion.
- For auxiliary refinery piping networks with limited budgets and extremely mild corrosive conditions, Duplex Stainless Steel Grade 2205 is a suitable option; while it offers excellent resistance to stress corrosion cracking, it is not suitable for ultra-high-temperature applications.
applications areas
- Atmospheric and Vacuum Distillation Unit: Atmospheric Tower Overhead Vapor Line, Vacuum Tower Transfer Line, Over-flash Oil Line
- Fluid Catalytic Cracking (FCC) Unit: Fractionator Overhead Vapor Main Line, Slurry Circulation Piping
- Hydrocracking / Hydrotreating: Furnace Outlet Piping, High-Pressure Separator Inlet/Outlet, Hydrogen-Rich Reactor Feed Line
- Delayed Coking: Coke Drum Overhead Vapor Line, Quench Oil Piping
- Sour Water Stripping & Sulfur Recovery: Rich Amine Lines, Large-Diameter Acid Gas Transport Lines
- Refinery-wide Systems: High-Pressure Steam Long-Distance Pipelines, Large-Diameter Cooling Water Lines, Flare Header
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: What is the maximum outer diameter and wall thickness you can produce?
A: We can produce outer diameters up to 1800mm and wall thicknesses up to 60mm. Please confirm with our technical department in advance for extra-large sizes.
Q: Does all pipework undergo non-destructive testing before delivery?
A: Yes. All ASTM A358 pipes undergo both ultrasonic (UT) and radiographic (RT) non-destructive testing before leaving the factory, strictly adhering to Class 1-Class 5 standards. They are free of defects such as weld porosity, cracks, and slag inclusions. Complete test reports are available and meet refinery acceptance standards.
Q: Can you perform high-temperature resistance and corrosion-resistant strengthening treatments?
A: Supported. We can provide customized treatments such as electropolishing, strengthening passivation, high-temperature coatings, and stress-relief annealing, significantly improving the pipes' resistance to high-temperature oxidation and media corrosion.
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