Stainless Steel Pipe For Industrial
Stainless steel square tube is a kind of hollow long steel material. It is called square tube because its cross section is square. They are widely used as pipelines for transporting fluids, such as oil, natural gas, water, coal gas, steam, etc. In addition, they are lighter in weight when bending and torsional strength are the same, so they are also widely used in manufacturing mechanical parts and engineering structures.
Stainless Steel Welded Pipe Specification
| Standard | Outside Diameter ( m m ) | Thickness ( m m ) | Length(mm) | ||||
| ASTM A312 | ≤48.26 | +0.40-0.80 | unspecified -12.50% |
Definite cut length +6.40 -0 |
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| >48.26-114.30 | +0.80-0.80 | ||||||
| >114.30-219.08 | +1.60-0.80 | ||||||
| >219.08~457.20 |
+2.40-0.80
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| >457-660 | +3.20/-0.80 | ||||||
| >660-864 | +4.00/-0.80 | ||||||
| >864~1219 | +4.48/-0.80 | ||||||
| HG 20537.3/4 | Dn≤150 150<DN<300 Dn≥300 |
±0.75%,min±0.3mm ±1% ±1% |
±10%S,min±0.3mm | +6.00 -0 |
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| GB/T 12771 | ＜13.00 13.00-40.00 ≥40.00 |
±0.20 ±0.30 ±0.80% |
≤4.00 >4.00 |
+0.50 -0.60 ±10% |
+20.00 -0 |
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| EN 10217-7 | D1±1.50% with±0.75mm(min D2±1.00% with±0.50mm(min) D3±1.75% with±0.30mm(min) D4±0.50% with±0.10mm(min) EN ISO 1127 |
T1±15.00% T2±12.5% T3±10.00% T4±7.50% T5±5.00% EN |
with±0.60mm(min) with±0.40mm(min) with±0.20mm(min) with±0.15mm(min) with±0.10mm(min) ISO 1127 |
≤6000 +5.00 -0 6000~12000 +10.00 -0 |
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| EN 10217-7 | D1±1.50% with±0.75mm(min D2±1.00% with±0.50mm(min) D3±1.75% with±0.30mm(min) D4±0.50% with±0.10mm(min) EN ISO 1127 |
T1±15.00% T2±12.5% T3±10.00% T4±7.50% T5±5.00% EN |
with±0.60mm(min) with±0.40mm(min) with±0.20mm(min) with±0.15mm(min) with±0.10mm(min) ISO 1127 |
≤6000 +5.00 -0 6000~12000 +10.00 -0 |
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SS Pipe Wall Thickness Tolerance
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Pipe Outer Diameter
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Outer Diameter Tolerance
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Wall Thickness Tolerance
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1/8"NB – 1 1/2"NB
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+0.40mm, -0.8mm
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+/- 12.50%
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2"NB – 4"NB
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+/-0.8mm
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+/- 12.50%
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5"NB – 8"NB
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+1.6mm, -0.8mm
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+/- 12.50%
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Stainless steel square tube performance:
Metals can react with oxygen in the atmosphere to form an oxide film on the surface. The iron oxide formed on ordinary carbon steel will continue to oxidize, causing corrosion to continue to expand and eventually form holes.
This can use paint or oxidation-resistant metal plating to protect the surface of carbon steel, but this protective layer is only a thin film. If the protective layer is damaged, the steel below will begin to rust again.
Whether stainless steel pipes are corroded is related to the chromium content in the steel. When the chromium content in the steel reaches 12%, it will not be easily corroded.
SS Welded Pipe
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