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GB 9948 10
GB 9948 20
GB 9948 12CrMo
GB 9948 15CrMo
GB 9948 12Cr1Mo
GB 9948 12Cr1MoV
GB 9948 12Cr2Mo
GB 9948 12Cr5Mo
GB 9948 12Cr9Mo
GB 9948 07Cr19Ni10
GB 9948 07Cr18Ni11Nb
GB 9948 07Cr19Ni11Ti
GB 9948 022Cr17Ni12Mo2
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GB 9948 Seamless steel tubes for petroleum cracking
Standard: GB 9948
Equivalent Standards: ASTM A335, ASTM A213, EN 10216-2, ISO 9329-2
Material: 15CrMo
Equivalent Materials: 13CrMo4-5, T12, P12, 13CrMo44, STBA22
Chemistry Composition
C, %
Si, %
Mn, %
P, %
S, %
Cr, %
Ni, %
Cu, %
Mo, %
0.12-0.18
0.17-0.37
0.40-0.70
0.025 max
0.015 max
0.80-1.10
0.30 max
0.20 max
0.40-0.55
Mechanical Properties
Tensile Strength , MPa
Yield Strength, MPa
Elongation, %
Impact (KV2)/J
Hardness (HBW)
440-640
295 min
21 min
40 (OD≥76mm & WT≥14mm)
170 max
Outside Diameter & Tolerance
Hot Rolled
Outside Diameter, mm
Tolerance
Ordinary
Advanced
OD≤54
±0.50mm
±0.30mm
54<OD≤325
±1%
±0.75%
OD>325
±1%
-
Cold Drawn
Outside Diameter, mm
Tolerance
Ordinary
Advanced
OD≤25.4
±0.15mm
-
25.4<OD≤40
±0.20mm
-
40<OD≤50
±0.25mm
-
50<OD≤60
±0.30mm
-
OD>60
±0.75%
±0.50%
Wall thickness & Tolerance
Hot Rolled
Wall Thickness, mm
Tolerance
Ordinary
Advanced
WT≤20
+15%/-10%
±10%
WT>20
+12.5%/-10%
±10%
Cold Drawn
Wall Thickness, mm
Tolerance
Ordinary
Advanced
WT≤3.0
±0.30mm
±0.20mm
WT>3
±10%
±7.5%
GB 9948 specifies the classification, code, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of seamless steel tubes for petroleum cracking. GB 9948 is applicable to seamless steel tubes for furnace tubes, heat exchanger tubes and pressure piping for petrochemical industry.
GB 9948规定了石油裂化用无缝钢管的分类、代号、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 9948适用于石油化工用炉管、热交换器管和压力管道用无缝钢管。
Manufacture: tubes to GB 9948 shall be manufactured by hot rolled or cold drawn.
Heat Treatment: the tubes shall be produced by heat treated as normalizing & tempering.
Inspection & Test: chemistry composition analysis, tension test, flattening test or bending test, flaring test, hardness test (alloy & stainless), impact test, macroscopic examination, non-metallic inclusions, microstructure, intergranular corrosion test (stainless), 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 9948, High Pressure Steel Pipe, Heat Exchanger Steel Tubes, Furnace Tubes, Piping
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