ASTM A312 TP304 Welded Stainless Steel Pipe Corrosion Resistant For Chemical Industry
Corrosion-Resistant ASTM A312 TP304 Stainless Steel Welded Pipe for Chemical Industry
Product Description
ASTM A312 TP304 stainless steel welded pipe (UNS S30400) is an austenitic chromium-nickel alloy formed by rolling plate or strip into a tubular shape and joining the longitudinal seam by automatic welding. The 18–20% chromium and 8–10.5% nickel content produces a stable austenitic structure with a self-renewing chromium oxide passive layer that resists oxidizing acids and mildly corrosive chemical media. Welded pipe offers a cost advantage over seamless construction because thinner wall thicknesses can be produced with tighter dimensional consistency and a smoother internal surface. The weld seam is fully penetrated and radiographically inspectable, and post-weld solution annealing or pickling restores corrosion resistance in the heat-affected zone. This pipe is specified for chemical processing lines where moderate pressure and good corrosion resistance are required at lower cost than seamless alternatives.
Key Specifications
| Parameter | Specification |
|---|---|
| Standard | ASTM A312 / ASME SA-312 |
| Grade | TP304 (UNS S30400) |
| Type | Welded (longitudinal seam) |
| Outer Diameter | 6mm – 1200mm |
| Wall Thickness | 0.5mm – 30mm (SCH5S – SCH80S) |
| Length | 6m / 12m or cut to order |
| Tensile Strength | ≥515 MPa |
| Yield Strength | ≥205 MPa |
| Elongation | ≥35% |
| Hardness | ≤90 HRB |
| Chromium | 18.00 – 20.00% |
| Nickel | 8.00 – 10.50% |
| Weld Type | ERW / TIG / Laser |
Applications
TP304 welded pipe is used in chemical transfer lines, cooling water systems, ventilation ducting, food and beverage process piping, pharmaceutical clean lines, water treatment plant piping and low-pressure steam distribution.
Product Advantages
Lower cost than seamless pipe. Welded construction uses thinner strip and fewer processing steps, reducing unit price for large-diameter or thin-wall applications. Tighter wall tolerance and smoother bore. Strip feedstock allows consistent wall thickness and better internal surface finish than pierced seamless pipe. Inspectable weld seam. Full-length radiographic or ultrasonic testing verifies weld integrity before shipment.
Product Functions
The pipe functions as a corrosion-resistant conduit for fluid transfer, handling chemical solutions, process water and gases at moderate pressures and temperatures while maintaining a cleanable internal surface.
Instructions for Use
Store horizontally on wooden supports. Cut with abrasive saw or lathe; bevel ends for welding. Use ER308L filler wire with argon purge. Post-weld pickling restores passivation. Verify weld seam orientation during installation to avoid stress concentration at bends.
Precautions
Prevent carbon steel contact to avoid iron contamination. Avoid chloride-rich media above 60°C, which can cause stress corrosion cracking. Do not use hydrochloric acid cleaners. Confirm weld quality certificates before pressure service.
Shipping Information
Standard sizes ship 10–15 days after deposit. Custom diameters and wall thicknesses add 5–7 days. Ports: Qingdao, Shanghai, Tianjin.
Payment Terms
T/T (30% deposit, balance before shipment) or irrevocable L/C at sight.
Packaging
Hexagonal bundles with steel strapping, end caps, moisture-proof wrapping, fumigated wooden pallets or crates. Labels show grade, size, heat number and length.
After-Sales Policy
Quality claims accepted within 7 working days with batch number and third-party inspection report. Confirmed material or dimensional non-conformity qualifies for replacement or refund. Defects from cutting, welding or field bending are not covered. Technical support provided for welding procedures and corrosion assessment.
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