What is the equivalent of SA335 P1 boiler tube

1. Chemical composition comparison
SA335 P1 belongs to the low alloy ferritic steel in ASTM A335 standard, and its typical composition is:

Carbon (C): ≤ 0.15 per cent
Chromium (Cr): 0.50-0.81%
Molybdenum (Mo): 0.44-0.65%.
According to the domestic GB/T 5310 standard, 12CrMoG (chemical composition: Cr 0.80-1.10%, Mo 0.45-0.60%) of the chromium and molybdenum content is similar to P1, and the same low-alloy heat-resistant steel categories.
2. Match of properties and applications
High-temperature performance: P1 is suitable for high-temperature environment ≤ 550 ℃, with creep resistance and oxidation resistance, commonly used in boiler piping and heat exchangers.
Corresponding material: 12CrMoG is also used in high temperature parts of power station boilers and petrochemical equipments, and its upper working temperature is close to that of P1.
3. Correspondence between domestic and foreign standards
According to the cross-reference between ASTM and the national standard, the equivalent material of SA335 P1 can be identified as 12CrMoG (GB/T 5310), but it should be noted that the two in the carbon content (12CrMoG C ≤ 0.15% consistent with P1) and trace elements (such as manganese, silicon) of the slight difference between the two However, it is necessary to pay attention to the slight differences in carbon content (12CrMoG C ≤ 0.15% and P1) and trace elements (such as manganese, silicon).

Summary
The domestic counterpart of SA335 P1 is 12CrMoG (GB/T 5310), which is suitable for high-temperature pressure scenarios, but the compatibility of chemical composition and mechanical properties should be verified in relation to specific working conditions.