At present, the material of SSAW steel pipe which widely used on the market is Q235B, It is because Q235B material is affordable and its performance is good for many industries, but in some special industries, high-performance materials such as Q345 and L360 are also used.

Q235B SSAW steel pipe

Material of SSAW steel pipe include: Q235 A, Q235B, 20#, Q345 (16Mn), L245 (B), L290 (X42), L320 (X46), L360 (X52), L390 (X56), L415 (X60), L450(X65), L485(X70), L555(X80), L290NB/MB(X42N/M), L360NB/MB(X52N/M), L390NB/MB(X56N/M), L415NB/MB(X60N/M) , L450MB(X65), L485MB(X70), L555MB(X80).

Q235B is composed of Q+number+quality grade symbol+deoxidation method symbol. Its steel number is prefixed with "Q", which represents the yield point of the steel, and the following number represents the value of the yield point in MPa. For example, Q235 represents a carbon structural steel with a yield point (σs) of 235 MPa.

Q345 is a kind of steel material. It is a low-alloy steel, "Q" means yield strength, Q345 means that the yield strength of this steel is 345MPa. Q345 will decrease its yield value as the thickness of the material increases. And the domestic ones may be less than 345, so the strength should be less than 345 during mechanical design, otherwise there will be problems.

API5l X52 oil line pipe API5L standard, standard: API 5L-American Petroleum Institute Standard (PSL1, PSL2) GB/T9711-Chinese National Standard (GB/T9711.1, B/T9711.2)