304 Stainless Steel Pipe is a pipe made up of an austenitic stainless steel grade 304 that has 18% chromium and 8% nickel in the composition,also with other chemical elements complementing the overall build quality of the product.The high content of chromium and nickel providing excellent resistance from corrosion,forming an austenitic metal with excellent quality.
The 304 SS pipe is manufactured using seamless processing technology, which ensures that the surface of the pipe is smooth and not prone to cracks,improving the reliability and service life of the 304 seamless pipe. The specifications for the 304 pipes range as A312 and A358 in the ASTM specifications. The dimensions range according to the ASTM, ASME and API standards.The sizes of 304 steel pipes range from 1/8 inches to 30 inches.
ASTM A312 TP304 seamless pipe can be widely used in pipeline systems in chemical, petroleum, pharmaceutical, food, machinery and other industries.The ASTM A312 TP304 Pipe also can be used for high pressure and high temperature applications because of the high operating temperature of 870 degrees Celsius and the strength.
ASTM A312 TP304 Seamless 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 |
| 304 ERW Pipes | 1/2″ NB – 24″ NB |
| 304 EFW Pipes | 6″ NB – 100″ NB |
| Size | 1/8″NB TO 30″NB IN |
| 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 |
ASTM A312 TP304 Chemical Composition
| Element | SS 304 |
| Ni | 8.0 – 11.0 |
| C | 0.08 |
| Mn | 2.0 max |
| P | 0.045 max |
| S | 0.03 max |
| Si | 1.0 max |
| Cr | 18.0 – 20.0 |
SS 304 Seamless Pipe Tolerance
| 304 Stainless Steel Pipe OD | ASTM A312 TP304 Pipe Tolerance |
| 4-35mm | ±0.08mm |
| 35-38mm | ±0.15mm |
| 38-60mm | ±0.20mm |
| ≥60 | ±0.25mm |
304 Stainless Steel Seamless Pipe Suface Finish
| Surface Finish | Internal Surface(ID) | Exterbal Surface(OD) | |||
| Roughness Average(RA) | Roughness Average(RA) | ||||
| μ inch | μm | μ inch | μm | ||
| AP | Annealed & Pickled | Not defined | Not defined | 40 or Not defined | 1.0 or Not defined |
| BA | Beight Annealed | 40,32,25,20 | 1.0,0.8,0.6,0.5 | 32 | 0.8 |
| MP | Mechanical Polish | 40,32,25,20 | 1.0,0.8,0.6,0.5 | 32 | 0.8 |
| EP | Electro Polish | 15,10,7,5 | 0.38,0.25,0.20;0.13 | 32 | 0.8 |
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