10CrMo9-10 steel pipe V.S. 12Cr2MoG steel pipe

The material corresponding to 10CrMo9-10 in China is 12Cr2MoG. The two have similarities and slight differences in chemical composition and mechanical properties. In practical applications, materials need to be reasonably selected based on specific engineering requirements and standards. Understanding this grade comparison relationship has important guiding significance for domestic related industries in material selection and substitution, and can effectively improve engineering efficiency and reduce costs.

Chemical composition comparison

• 10CrMo9-10 material: C content is 0.08 - 0.14%, Si≤0.50%, Mn is 0.30 - 0.70%, P≤0.020%, S≤0.010%, Cr is 2.00 - 2.50%, Mo is 0.90 - 1.10%, Ni≤0.30%, Al≤0.04%, Cu≤0.30%.
• 12Cr2MoG material: C content is 0.08-0.15%, Si≤0.50%, Mn is 0.40-0.60%, P≤0.025%, S≤0.015%, Cr is 2.00-2.50%, Mo is 0.90-1.13%. From the comparison, it can be seen that the content of the main alloy elements of the two is similar, which lays the foundation for their similar performance.

Mechanical properties comparison

• 10CrMo9-10 seamless steel pipe: tensile strength is 480-630Mpa, yield strength varies according to wall thickness, ≥280Mpa when the wall thickness is 16-40mm, ≥270Mpa when the wall thickness is 40-60mm, elongation after fracture ≥20%, longitudinal impact ≥40 joules, transverse impact ≥27 joules.
• 12Cr2MoG seamless steel pipe: tensile strength is 450-600Mpa, yield strength ≥280Mpa, elongation after fracture ≥22%, longitudinal impact ≥40 joules, transverse impact ≥27 joules. Although there are some differences in the values, they can meet the strength requirements of most projects in practical applications.

Comparison of heat treatment methods and delivery status

• 10CrMo9-10 seamless steel pipe: delivered by normalizing and tempering, normalizing temperature 900℃-960℃, tempering temperature 680℃-750℃.
• 12Cr2MoG high-pressure boiler tube: normalizing + tempering for steel tubes with wall thickness ≤30mm, normalizing temperature 900℃ - 960℃, tempering temperature 700℃ - 750℃; quenching + tempering or normalizing + tempering for steel tubes with wall thickness >30mm, quenching temperature not less than 900℃, tempering temperature 700℃ - 750℃; normalizing temperature 900℃ - 960℃, tempering temperature 720℃ - 750℃, and rapid cooling after normalizing. Different heat treatment methods will affect the final performance of the material, and should be selected according to specific circumstances in actual use.

In summary, 10CrMo9-10 corresponds to the domestic 12Cr2MoG material, which is equivalent to the 12Cr2MoG grade, and the two can be replaced with each other under certain conditions.