What is SS 304 erw pipe specification？
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What is SS 304 erw pipe specification?
SS 304 ERW (Electric Resistance Welded) pipe is a popular, cost-effective stainless steel pipe manufactured by cold-forming a flat coil of 304-grade steel into a tubular shape and welding its seam longitudinally using high-frequency electric currents.
Material Grade: Stainless Steel 304 / 304L (UNS S30400 / S30403)
Standard Manufacturing Specs: ASTM A312 / ASME SA312, ASTM A358, ASTM A778
Dimensions & Wall Thickness: ASME B36.10 / ASME B36.19
For industrial pipe buyers, weld reliability is often the primary consideration when purchasing TP304 Electric Resistance Welded stainless steel pipes. GNEE's ASTM A312 TP304 ERW steel pipes are manufactured using advanced high-frequency welding technology and undergo Inside Bead Removal (IBR) treatment. By mechanically removing and scarfing the internal weld bead, a smooth inner surface with minimal fluid resistance is achieved. This is particularly crucial for food processing, water treatment, pharmaceutical, and chemical transmission systems that demand extremely high fluid flow efficiency and cleanliness.
ASTM A312 TP304 Stainless Steel ERW Pipe Specification
| Specification | ASTM A312 / ASME SA312 |
| Outside Diameter | 1/2" To 48" |
| Schedule | SCH 5 To SCH XXS |
| Type | Seamless / ERW / Welded / Fabricated / CDW |
| Ends | Plain End, Beveled End, Threaded |
| Delivery Condition | Annealed and Pickled, Polished, Bright Annealed, Cold Drawn |
| Length | 6M Or As Custom, Single Random, Double Random , Standard & Cut length |
Chemical Composition (Weight %)
| Grade | UNS Designation | C (Max) | Mn (Max) | P (Max) | S (Max) | Si (Max) | Cr | Ni |
| TP304 | S30400 | 0.08% | 2.00% | 0.045% | 0.030% | 1.00% | 18.0–20.0% | 8.0–11.0% |
Mechanical & Physical Properties
| Grade | UNS Designation | Tensile Strength (min) | Yield Strength (min) | Elongation (min) | Hardness (Max) | Density |
| Units | - | MPa / ksi | MPa / ksi | % in 2" (50mm) | HBW / HRB | kg/m ³ |
| TP304 | S30400 | 515 / 75 | 205 / 30 | 35% | 192 / 90 | 7,930 |
Dimensional Tolerances (per ASTM A999)
| NPS Range (Inches) | OD Tolerance (Over) | OD Tolerance (Under) | WT Tolerance | Straightness | Weight Tolerance |
| 1/8" to 1-1/2" | +0.4 mm | -0.8 mm | ± 12.5% | ≤ 1.5 mm/m | +10% / -3.5% |
| > 1-1/2" to 4" | +0.8 mm | -0.8 mm | ± 12.5% | ≤ 1.5 mm/m | +10% / -3.5% |
| > 4" to 8" | +1.6 mm | -0.8 mm | ± 12.5% | ≤ 1.5 mm/m | +10% / -3.5% |
| > 8" to 12" | +2.4 mm | -0.8 mm | ± 12.5% | ≤ 1.5 mm/m | +10% / -3.5% |
What is the difference between 304 and 304L pipe?
The difference between 304 and 304L stainless steel pipe lies primarily in their carbon content. Standard 304 has a maximum carbon content of 0.08%, while 304L (the "L" stands for "Low") has a maximum of 0.03%. This distinction affects their weldability, strength, and resistance to corrosion.
Can SS304 ERW pipe be used for drinking water?
Yes, SS304 Electric Resistance Welded (ERW) pipe is safe and commonly used for drinking water. It is highly resistant to corrosion, hygienic, and does not leach harmful heavy metals in typical municipal tap water environments.
Applications
SS 304 ERW steel pipes are used in various applications involving moderate pressure and temperature conditions, including water supply systems, HVAC, structural components, food and dairy processing, and non-critical chemical piping lines.
Our Export Case Study
- Project: European Food Processing Plant
- Material: ASTM A312 TP304 ERW Pipe
- Size: DN50 - DN200
- Quantity: 120 Tons
- Testing: 100% PMI (Positive Material Identification)
- Result: Zero leakage for over 8 years of operation
ASTM A312 TP304 Stainless Steel Pipe Price Reference
| Product Type (Manufacturing Method) | Size Range | Reference Price (USD/Ton) |
|---|---|---|
| TP304 Welded Pipe (ERW) | NPS 1/2" – 8" (SCH 10S / SCH 40S) | $2,300 – $2,700 |
| TP304 Seamless Pipe | NPS 1/2" – 8" (SCH 40S / SCH 80S) | $3,300 – $3,900 |
| TP304L Stainless Steel Pipe | All sizes and schedules | +$50 – $100 Premium |
If you have project requirements for ASTM A312 TP 304 stainless steel pipes, we offer competitive prices and excellent service-click the button below to get the latest pricing!
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ASTM A312 TP304 Stainless Steel Pipe Supplier
GNEE Stainless Steel operates fully automated ERW production lines, enabling delivery of standard specifications in as little as seven days. All pipe ends are fitted with specialized protective caps before leaving the factory to prevent deformation caused by impacts during transit, ensuring the pipes are ready for immediate use upon arrival at your site.
Packaging and Delivery
| Item | Details |
| Package | Waterproof paper, edge protection, wooden pallets or crates |
| Loading Port | Tianjin, Qingdao, Shanghai, or any major Chinese seaport |
| Container Capacity | 1×20ft: Max 25 Tons, Max 5.8m length 1×40ft: Max 25 Tons, Max 11.8m length |
| Delivery Time | 7–15 working days depending on order quantity |
