ASTM A106 Gr.B seamless steel pipe

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Tianjin Sanon Steel Pipe Co., Ltd. is a stockist. Our stock factory is in Cangzhou City, Hebei Province. Our main sources of goods are boiler pipes, and the representative materials are ASTM A335 P5/P11/P91/P92, ASME SA-106/SA-106M GR.B, GB/T 3087-2008 10#/20#. The representative materials of pipeline pipes are API 5L, API 5CT, the representative materials of petroleum cracking pipes GB/T 9948 are 15MoG/12CrMoVG. GB/T 6479-2013 represents the material 10#/20#, heat exchanger tubes SA179/SA210/SA192, etc., mechanical tubes GB/T 8162 represent the material 10#/20#/Q345/42CrMo, EN10210 represents the material S355JOH/S355J2H, gas cylinder tubes GB1 8248, represent the material 34CrMo4/30CrMo.

ASTM A106 Gr.B seamless steel pipe is a high-temperature carbon steel seamless pipe in the American Society for Testing and Materials standard, which is often used for fluid transportation under high temperature and high pressure environment. The corresponding materials in China mainly refer to the Chinese national standard (GB) and industry standards, and need to be matched from three perspectives: chemical composition, mechanical properties, and usage scenarios.

There are usually two options for domestic material comparison:

The first corresponding material: 20 steel (GB/T 8163)
20 steel is an ordinary carbon structural steel, which is a common material in the GB/T8163 standard and is suitable for general fluid transportation. Chemical composition comparison: ASTM A106 Gr.B has a carbon content (C) of 0.17-0.24%, and a manganese (Mn) of 0.29-1.06%; 20 steel has a carbon content of 0.17-0.24%, and a manganese content of 0.35-0.65%. The carbon content of the two is close, but the manganese content of ASTM A106 Gr.B has a higher upper limit and better high temperature performance.
Mechanical properties comparison: ASTM A106 Gr.B has a tensile strength of >415MPa and a yield strength of >240MPa; 20 steel has a tensile strength of >410MPa and a yield strength of >245MPa. The data are similar but the applicable temperatures are different.
Usage restrictions: 20 steel is suitable for working conditions with a design temperature below 350℃ and a low pressure. If used for high temperature and high pressure (such as boiler pipes), a higher standard material must be selected.
The second corresponding material: 20G (GB 5310)
20G is a seamless steel pipe material for high-pressure boilers, which belongs to the GB 5310 standard and is suitable for high-temperature and high-pressure steam systems.
Chemical composition comparison: 20G has a carbon content of 0.17-0.24%, a manganese content of 0.35-0.65%, and a stricter control of phosphorus and sulfur content, which is more consistent with the indicators of ASTMA106 Gr.B.
Mechanical properties comparison: 20G’s tensile strength is ≥410MPa, and its yield strength is >245MPa, which is almost the same as ASTM A106 Gr.B, and the allowable operating temperature is up to 450℃.
Application scenarios: 20G is commonly used in boiler pipes of thermal power plants and chemical high-pressure equipment, and can replace ASTM A106 Gr.B for the same working conditions.
Replacement precautions 1. Standard differences: ASTM A106 Gr.B requires transverse tensile test and flattening test, while GB/T 8163 only requires longitudinal tensile test. When replacing, it is necessary to confirm whether the test items meet the requirements.
2. Heat treatment requirements: ASTM A106 Gr.B is usually delivered in hot-rolled state, 20G requires normalizing treatment, and the process needs to be adjusted if replaced.
3. Certification requirements: If the export project specifies the American standard material, it is necessary to confirm with the customer whether the national standard replacement is accepted. Some projects may require additional third-party inspection.
Practical application case
A petrochemical enterprise purchased ASTM A106 Gr.B pipes for high-temperature oil transportation. Due to the long delivery cycle, it switched to 20G material. After third-party testing, the impact toughness (-20℃ KV2234J) and high-temperature strength (yield strength>180MPa at 450℃) of 20G met the design requirements, and the project was accepted.
Summary
ASTM A106 Gr.B can correspond to 20 steel (general working conditions) or 20G (high temperature and high pressure working conditions) in China. When replacing, it is necessary to combine the specific temperature, pressure and testing standards. It is recommended to give priority to 20G material, whose chemical composition and performance are closer to the US standard requirements and have a wider range of applications.