SS 304 Seamless Tube is made by cold drawing or hot rolling process.As its name implies, Seamless stainless steel pipe has no longitudinal weld seam. In fact,It is one solid homogeneous piece of steel. The solid billet is simply heated and then stretched over a series of mandrels until the stainless pipe has achieved its desired diameter and wall thickness.SS 304 seamless pipe is a commonly used stainless steel pipe material with a excellent corrosion resistance and heat resistance,widely used in chemical, petroleum, food processing, medical equipment, pharmaceutical and other industrial fields.
SS 304 is a type 18-8 stainless steel containing 18% chromium and 8% nickel.While the 18% chromium acts like skin, providing resistance from corrosion, and the 8% nickel may increase its value, forming a superior quality austenitic metal.
SS 304 Seamless Tube Specification
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Product Name |
304 Stainless Steel Seamless Pipe
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Technology |
Hot Rolled,Cold Rolled |
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Material |
201,202,301,302,304,304L,310S,316,316L,321,430,430A,309S,2205,2507,2520,430,410,440, 904L,or Customized |
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Thickness |
0.4-50 mm |
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Length |
1-12 m |
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Outer Diameter(OD) |
10-2000mm |
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Standard |
ASTM,JIS,GB,AISI,DIN,BS,EN |
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Certifications |
ISO 9001, BV ,SGS |
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Packing |
Industry standard packaging or according to client's requirement |
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304 SS Seamless Tubing Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N |
| SS 304 | 0.08 max | 2 max | 0.75 max | 0.045 max | 0.030 max | 18 – 20 | - | 8 – 11 | - |
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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