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GB/T 6479 10
GB/T 6479 20
GB/T 6479 Q345B
GB/T 6479 12CrMo
GB/T 6479 15CrMo
GB/T 6479 12Cr2Mo
GB/T 6479 12Cr5Mo
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GB/T 6479 Seamless Steel Tubes for High-pressure Chemical Fertilizer Equipments
Standard: GB/T 6479
Equivalent Standards: EN 10216-2, ISO 9329-2
Material: 12Cr5Mo
Equivalent Materials: X11CrMo5, T5, P5, STBA25, 1Cr5Mo
Chemistry Composition
C, %
Si, %
Mn, %
P, %
S, %
Cr, %
Ni, %
Cu, %
Mo, %
0.15 max
0.50 max
0.60 max
0.025 max
0.015 max
4.00-6.00
0.60 max
0.20 max
0.40-0.60
Mechanical Properties
Tensile Strength , MPa
Yield Strength, MPa
Elongation, %
Impact (KV2)/J at 20℃
390-590
195 min
22 min
40 (OD≥76mm & WT≥6.5mm)
Outside Diameter & Tolerance
Hot Rolled
Outside Diameter, mm
Tolerance
OD≤159
+1% or +0.50mm
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%
Wall thickness & Tolerance
Hot Rolled
Outside Diameter, mm
Tolerance
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%
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 fully annealing.
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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