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GB/T 5312 Grade 320 Carbon-Manganese Steel Seamless Pipe
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GB/T 5312 Grade 320 Carbon-Manganese Steel Seamless Pipe
GB/T 5312
This standard specifies the classification, code, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of carbon steel and carbon-manganese steel seamless steel tubes (hereinafter referred to as steel pipes) for ships.
GB/T 5312 Grade 320 Seamless Steel Pipe
Grade 320 is a grade of GB/T 5312 standard,GB/T 5312 Grade 320 seamless steel pipes are applicable to the manufacture of Class I pressure piping systems for ships, Class II pressure piping systems, carbon steel and carbon manganese steel seamless steel tubes for boilers and superheaters.
GB/T 5312 Grade 320 seamless steel pipe Quick Details
Type：Seamless Steel Pipe.
Material：Grade 320.
WT：5-20mm.
OD：34-219mm
Length：6M or specified length as required.
Ends：Plain End、Beveled End、Treaded
FOB Price: US $500-1200 / Ton | 1 Ton/Tons (Min. Order)
Additional Info
Port of Shipment: Tianjin, China
Payment Terms：T / T, LC
Delivery: 7-15 days after payment
Surface： Tubes will be varnished (Outside only) to prevent rust.
Marking：Standard + Steel Grade + Size + Heat No + Lot No
Package：Standard export package,suit for all kinds of transport, or as required
Size Tolerance
| sSeel pipe | Outer diameter (OD) | Wall thickness(WT) | ||
| Cold drawn pipe | Outer diameter(mm) | tolerance | wall thickness(mm) | tolerance |
| ＞30～50 | ±0.3 | ≤30 | ±10％ | |
| ＞50～219 | ±0.8％ | |||
| Hot rolled pipe | ＞219 | ±1.0％ | ＞20 | ±10％ |
Mechanical Properties of GB/T 5312 Grade 320
| Standard | Grade | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) |
| GB/T5312 | 320 | 320～410 | ≥195 | ≥25 |
Chemical Composition of GB/T 5312 Grade 320
| Standard | Grade | Chemical composition(%) | ||||
| C | Si | Mn | P | S | ||
| GB/T5312 | 320 | ≤0.16 | ≤0.35 | 0.40～0.70 | ≤0.035 | ≤0.035 |
Note: Residual elements Cr≤0.25%, Mo≤0.10%, Ni≤0.30%, Cu≤0.30%, total ≤0.70%
Tests and Inspection
Tension test, flattening test, flaring test, hardness test, hydrostatic or nondestructive electric test be made on GB/T 5312 Grade 320 seamless steel pipes.
Application:
GB/T 5312 Grade 320 seamless steel pipes are used in the manufacture of seamless steel pipes for marine boilers and superheaters and I and II pressure pipes.
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