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GB/T 6479 Seamless Steel Tubes for High-pressure Chemical Fertilizer Equipments |
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Standard: GB/T 6479 Equivalent Standards: EN 10216-2, ISO 9329-2 |
Material: Q345B
Equivalent Materials: Q355B, E355, 16Mn |
Chemistry Composition |
C, % |
Si, % |
Mn, % |
P, % |
S, % |
Cu, % |
Cr, % |
Ni, % |
Nb, % |
Mo, % |
V, % |
0.12-0.20 |
0.20-0.50 |
1.20-1.70 |
0.025 max |
0.015 max |
0.20 max |
0.30 max |
0.50 max |
0.07 max |
0.10 max |
0.15 max |
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Mechanical Properties |
Tensile Strength , MPa |
Yield Strength, MPa |
Elongation, % |
Impact (KV2)/J at 20℃ |
490-670 |
345 min |
21 min |
40 (OD≥76mm & WT≥6.5mm) |
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Outside Diameter & Tolerance |
Hot Rolled |
Outside Diameter, mm |
Tolerance
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OD≤159 |
+1% or +0.50mm
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OD>159 |
Cold Drawn |
Outside Diameter, mm |
Tolerance |
Ordinary |
Advanced |
OD≤30 |
±0.20mm |
±0.15mm |
30<OD≤50 |
±0.30mm |
±0.25mm |
OD>50 |
±0.50% |
±0.50% |
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Wall thickness & Tolerance |
Hot Rolled |
Outside Diameter, mm |
Tolerance
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OD≤159 |
+12.5%/-10% or +0.50mm/-0.40mm |
OD>159, WT/OD≤0.05 |
+15%/-10% |
OD>159, 0.05<WT/OD≤0.10 |
+12.5%/-10% |
OD>159, WT/OD>0.10 |
±10% |
Cold Drawn |
Wall Thickness, mm |
Tolerance |
Ordinary |
Advanced |
WT≤2.0 |
+12.5%/-10% |
±10% |
WT>2.0 |
±10% |
±7.5% |
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GB 6479 specifies the size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of seamless steel pipes for high-pressure fertilizer equipment. GB 6479 is applicable to seamless steel pipes for high-pressure chemical fertilizer equipment and pipelines, as well as seamless steel pipes for other chemical equipments.
GB 6479规定了高压化肥设备用无缝钢管的尺寸、外形、重量、技术要求、试验方法、检验规则、包装、标志和质量证明书。GB 6479适用于高压化肥设备和管道用无缝钢管,也适用于其他化工设备用无缝钢管。 |
Manufacture: tubes to GB/T 6479 shall be manufactured by hot rolled or cold drawn.
Heat Treatment: the tubes shall be produced by heat treated as normalizing.
Inspection & Test: chemistry composition analysis, tension test, flattening test, flaring test, impact test, macroscopic examination, non-metallic inclusions, NDT, surface inspection and dimension check. |
Length: 4000mm; 6000mm; 9000mm; 12000mm; and so on.
Max developed length: 30 meters, also U bending, finning, studded process can be provided.
Option: shot blasting on the outside surface to remove mill scale, make the surface matte colour; surface polishing as preparation work done for further processing, for instance finning. |
Keyword: GB/T 6479, High Pressure Steel Pipe, High Pressure Chemical Fertilizer Steel Tube, Pipeline, Piping |
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