The ASTM A573 carbon steel structural steel carbon plate equivalent material

Q355GNH weathering steel: Q——The first letter of the Chinese pinyin of "Qu" in the yield strength;
355——The lower limit of the lower yield strength of steel, in N/mm²;
GNH——respectively the first letter of "Gao, Nai, Hou" Chinese Pinyin;
Quality grades are divided into A, B, C, D, E
(1)Q355GNH executive standard: GB/T 4171-2008
(2)Q355GNH smelting method: the steel is smelted by converter or electric furnace, and it is killed steel.

ASTM A573 carbon steel structural steel carbon plate, Q345 and Q345B are steel numbers. The differences are as follows:1. Q345 is general and does not indicate the quality level; Q345B is clear and the quality level is B.2. Q345 does not require to inspect the impact performance; Q345B requires that the impact performance at room temperature is qualified (impact at 20 ℃).3. Q345 does not indicate carbon content of steel; Q345B carbon content is 0.20%.Q345 refers to carbon structural steel with yield point (σ s) of 345MPa. The following letters indicate the quality level, including A, B, C, D and E.

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