ASTM A312 SS 304 ERW Pipe Specification
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What is SS 304 erw pipe specification?
ASTM A312 is the standard specification for seamless, straight-seam welded, and heavily cold-worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive services. SS 304 ERW Pipe refers to pipes manufactured from the 304 grade austenitic stainless steel using the Electric Resistance Welding (ERW) process, where a steel strip is rolled and the seam is welded together.
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.
304 ERW vs Seamless Stainless Steel Pipe
ASTM A312 TP304 Stainless Steel ERW Pipe Specification
| Specifications | ASTM A 312 ASME SA 312 / ASTM A 358 ASME SA 358 |
| Dimensions | ASTM, ASME and API |
| SS 304 Pipes | 1/2″ NB – 16″ NB |
| ERW 304 Pipes | 1/2″ NB – 24″ NB |
| EFW 304 Pipes | 6″ NB – 100″ NB |
| Size | 1/8″NB TO 30″NB IN |
| Specialized in | Large Diameter Size |
| Schedule | SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
| Type | Seamless / ERW / Welded / Fabricated / LSAW Pipes |
| Form | Round, Square, Rectangular, Hydraulic Etc |
| Length | Single Random, Double Random & Cut Length. |
| End | Plain End, Beveled End, Treaded |
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 |
Tolerance Chart of 304 Stainless Steel 304 Tube
| 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% |
ASTM A312 SS 304 ERW Pipe Pressure Rating Chart
| NPS (Inch) | OD (mm) | Sch 10S WT (mm) | Pressure (PSI) | Pressure (Bar) | Sch 40S WT (mm) | Pressure (PSI) | Pressure (Bar) | Sch 80S WT (mm) | Pressure (PSI) | Pressure (Bar) |
| 1/2" | 21.34 | 2.11 | 3,365 | 232 | 2.77 | 4,418 | 304 | 3.73 | 5,949 | 410 |
| 3/4" | 26.67 | 2.11 | 2,693 | 185 | 2.87 | 3,663 | 252 | 3.91 | 4,989 | 344 |
| 1" | 33.40 | 2.77 | 2,817 | 194 | 3.38 | 3,438 | 237 | 4.55 | 4,628 | 319 |
| 1-1/4" | 42.16 | 2.77 | 2,231 | 154 | 3.56 | 2,868 | 197 | 4.85 | 3,908 | 269 |
| 1-1/2" | 48.26 | 2.77 | 1,950 | 134 | 3.68 | 2,590 | 178 | 5.08 | 3,576 | 246 |
| 2" | 60.33 | 2.77 | 1,560 | 107 | 3.91 | 2,202 | 151 | 5.54 | 3,120 | 215 |
| 2-1/2" | 73.03 | 3.05 | 1,421 | 98 | 5.16 | 2,404 | 165 | 7.01 | 3,266 | 225 |
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
| Price list of Stainless Steel 304 Pipe in | SS 304 Pipes Price in USD |
|---|---|
|
ASTM A 312 GRADE TP304 SIZE(48.26MM OD X 2.60MM THK X 6000M LENGTH |
2.21 USD |
|
ASTM A 312 GRADE TP304 SIZE(42.16MM OD X 2.60MM THK X 6000M LENGTH |
2.21 USD |
|
ASTM A 312 GRADE TP304 SIZE(219.08MM OD X 7.70MM THK X 6000M LENGTH |
2.49 USD |
ASTM A312 TP304 Stainless Steel Pipe Supplier-GNEE
Value-added services for 304 stainless steel piping
Polishing of 304 and 304L stainless steel pipes
Heat treatment, annealing, and pickling of 304 and 304L steel pipes
Ultrasonic testing of 304L piping
100% X-ray inspection of welded seams for large-diameter, custom-sized 304L stainless steel pipes
Beveling of 304 and 304L stainless steel pipes
Special testing requirements-destructive testing, non-destructive testing, etc.
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 |
