GB/T 5312 Grade 320 Carbon-Manganese Steel Seamless Pipe
- GB/T 5312
- China
- Stock
- 320, 360, 410, 460, 490, etc.
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.
GB/T 5312 Grade 320 Carbon-Manganese Steel Seamless Pipe
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
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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