GB 9948 Cold Drawn Seamless Steel Pipe For Petroleum Cracking And Heat Exchangers
GB 9948 is a standard specification for seamless steel pipes used in petroleum cracking and heat exchangers. This standard specifies the classification, code, shape, size, weight, technical requirements, test methods, inspection rules, packaging, marking, and quality certificate of cold-drawn seamless steel pipes for petroleum cracking and heat exchangers. In this article, we will discuss the material, specification, chemical composition, mechanical properties, steel grade, and application of GB 9948.
Material
The material used in GB 9948 cold-drawn seamless steel pipes is carbon steel, alloy steel, and stainless steel. The carbon steel used in this specification includes grades like 10, 20, and 35, while the alloy steel includes grades like 12CrMo, 15CrMo, and 12Cr2Mo. The stainless steel grades used are 0Cr18Ni9 and 1Cr18Ni9Ti.
Specification
The specification of GB 9948 cold-drawn seamless steel pipes includes the following:
- OD (Outer Diameter): 10-168mm
- WT (Wall Thickness): 1-20mm
- Length: 4-12m
Chemical Composition
The chemical composition of GB 9948 cold-drawn seamless steel pipes is specified in the table below:
| Steel Grade | Chemical Composition |
| 10 | C: ≤0.13, Si: ≤0.37, Mn: 0.50-0.80, Cr: ≤0.25, Ni: ≤0.30, Cu: ≤0.25, S: ≤0.035, P: ≤0.035 |
| 20 | C: ≤0.22, Si: ≤0.37, Mn: 0.50-0.80, Cr: ≤0.25, Ni: ≤0.30, Cu: ≤0.25, S: ≤0.035, P: ≤0.035 |
| 35 | C: ≤0.42, Si: ≤0.37, Mn: 0.50-0.80, Cr: ≤0.25, Ni: ≤0.30, Cu: ≤0.25, S: ≤0.035, P: ≤0.035 |
| 12CrMo | C: 0.08-0.15, Si: 0.17-0.37, Mn: 0.40-0.70, Cr: 0.40-0.70, Mo: 0.40-0.55, S: ≤0.035, P: ≤0.035 |
| 15CrMo | C: 0.12-0.18, Si: 0.17-0.37, Mn: 0.40-0.70, Cr: 0.80-1.10, Mo: 0.40-0.55, S: ≤0.035, P: ≤0.035 |
| 12Cr2Mo | C: 0.08-0.15, Si: 0.17-0.37, Mn: 0.40-0.70, Cr: 1.00-1.30, Mo: 0.45-0.60, S: ≤0.035, P: ≤0.035 |
| 0Cr18Ni9 | C: ≤0.07, Si: ≤1.0, Mn: ≤2.0, Cr: 17.0-19.0, Ni: 8.0-11.0, S: ≤0.03, P: ≤0.035 |
| 1Cr18Ni9Ti | C: ≤0.12, Si: ≤1.0, Mn: ≤2.0, Cr: 17.0-19.0, Ni: 8.0-11.0, Ti: 5C-0.70, S: ≤0.03, P: ≤0.035 |
Mechanical Properties
The mechanical properties of GB 9948 cold-drawn seamless steel pipes are specified in the table below:
| Steel Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
| 10 | ≥335 | ≥205 | ≥24 |
| 20 | ≥410 | ≥245 | ≥20 |
| 35 | ≥510 | ≥305 | ≥20 |
| 12CrMo | ≥440 | ≥205 | ≥20 |
| 15CrMo | ≥440 | ≥235 | ≥21 |
| 12Cr2Mo | ≥490 | ≥245 | ≥20 |
| 0Cr18Ni9 | ≥520 | ≥205 | ≥40 |
| 1Cr18Ni9Ti | ≥520 | ≥205 | ≥35 |
Steel Grade
The steel grades used in GB 9948 cold-drawn seamless steel pipes are listed below:
- 10
- 20
- 35
- 12CrMo
- 15CrMo
- 12Cr2Mo
- 0Cr18Ni9
- 1Cr18Ni9Ti
Application
GB 9948 cold-drawn seamless steel pipes are used in petroleum cracking and heat exchangers. These pipes are widely used in the petroleum industry for their high strength, corrosion resistance, and good machinability. They are also used in the manufacture of chemical equipment, boiler tubes, and high-pressure containers.
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Our factory covers an area of more than 25,000 square meters and has been in the steel pipe manufacturing business for 20 years. Over this period, we have accumulated a wealth of professional experience, which has helped us establish ourselves as a trusted name in the industry.
At our factory, we specialize in the production of various types of steel pipes, including stainless steel pipe, carbon steel pipe, copper pipe, steel pipe,seamless steel pipe and welded pipe. Our expertise in this field is evident from the 12 patents that we hold, which demonstrate our commitment to innovation and excellence.
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