GB9948-2006, petroleum cracking tube seamless pipe

is a national standard specifies classification, code name, dimension, shape, weight, technical requirements, specimen, test methods, test rules, packaging, mark and quality certificate. standard is applicable to Seamless steel tubes for petroleum cracking. GB9948 is mainly used in the manufacture of high-pressure and ultra-high pressure boiler superheater tubes, reheater tubes, windpipe, the main steam pipe.

GB9948 2006 petroleum cracking seamless pipe


Petroleum cracking tube by high-temperature and high-pressure tube under high temperature flue gas and water vapor will happen to oxidation and corrosion, oil cracking pipe thus requiring a high rupture strength, high oxidation resistance, and good organizationstability, made of steel No.: quality carbon structural steel No. 20G 20MnG, 25MnG; alloy structural steel No. 15MoG, 20MoG 12CrMoG 15CrMoG 12Cr2MoG 12CrMoVG 12Cr3MoVSiTiB etc.; rust heat-resistant steel commonly used 1Cr18Ni91Cr18Ni11Nb high pressure boiler tube in addition to ensure the chemical composition and mechanical properties, by root to do hydrostatic testing to make flaring, flattening test, high pressure seamless pipes to heat treatment delivery.

Overview of petroleum cracking tube

Production Method of manufacturing:

  • Generally seamless pipe temperature below 450 ℃, homemade pipe with 10 and 20 carbon structural steel, hot-rolled tubes or cold drawn pipe manufacturing.
  • GB9948 petroleum cracking tube standard seamless pipe is used, often in high temperature and high pressure conditions, under the action of the tube in the high temperature flue gas and water vapor will occur oxidation and corrosion. Steel pipe with high rupture strength, high resistance to oxidation corrosion and good organizational stability.


  • Generally seamless steel pipes mainly used for manufacturing water wall tube boiling water pipes overheated steam pipe, locomotive boiler overheated steam pipe, large, small smoke pipe and brick arch tubes.
  • GB9948 oil cracking pipe seamless pipe is mainly used for the manufacture of high-pressure and ultra-high pressure boiler superheater tubes, reheater tubes, windpipe, the main steam pipe.


  • The GB9948 oil cracking pipe standard seamless pipe according to withstand the high temperature performance is divided into a the general boiler tubes and high-pressure boiler tubes. Whether the the general boiler tubes or high-pressure boiler tube can be divided into its purposes require different kinds of steel pipe.

GB9948-2006 石油裂化管标准无缝管按所承受的高温性能分为一般锅炉管和高压锅炉管。无论一般锅炉管或高压锅炉管按其用途要求不同又可分为各种钢管。

主要钢级牌号 :10, 20, , , , , , (经协商,也可供应其他特殊牌号的钢管)

Chemical Compositions(%) of GB9948-2006:

Grade C Mn Si Cr Mo Ni Nb+Ta - -
10# 0.07-O.14 O.35-0.65 O.17-0.37 ≤0.15 - ≤0.25 - O.035 0.035
20# O.17-0.24 O.35-0.65 O.17-0.37 ≤O.15 - ≤O.25 - 0.035 O.035
12QM0 0.08-0.15 0.40-O.70 O.17-O.37 0.40-O.70 0.40-O.55 ≤O.30 - O.035 0.035
15CrM0 O.12-0.18 0.40-O.70 0.17-0.37 O.80-1.10 O.40-O.55 ≤0.30 - O.035 0.035
1Cr2M0 ≤0.15 O.30-O.60 0.50-1.00 2.15-2.85 O.45-0.65 - - 0.03 O.035
1Cr5M0 ≤O.15 ≤0.60 ≤0.50 4.00-6.00 O.45-0.60 ≤O.60 - O.030 0.035
1Crl9Ni9 O.04-0.10 ≤2.00 ≤1.00 18.0020.00 - 8.00-11.00 - 0.03 0.035
1Crl9NillNb O.04-O.10 ≤2.00 ≤1.00 17.0020.oo - 9.00-13.00 ≤8C%1.00% 0.03 0.035

Mechanical Properties of GB9948-2006:

Grade Tesile
Brinel hardness
10# 330-490 205 24 - -
20# 410-550 245 21 39 -
12CrMo 410-560 205 21 55 156
15CrMo 440-640 235 21 47 170
1Cr2Mo ≥(390) -175 -22 -92 -179
1CrSMo ≥390 195 22 92 187
1Crl9Ni9 ≥520 205 35 - -
1Crl9NillNb ≥520 205 35 - -

The W.T. tolerance of GB9948-2006:

种类 尺寸/mm 允许偏差/mm 长度及允许偏差/m
热轧(扩)管 外径 ≤159
壁厚 ≤20
冷拔(轧)管 外径 ≤30

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