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Grade Wall thickness mm Elongation δ5≥(%) Yield strength δs(MPa≥) Test temperature °C
Q345A ≤16 21 345 No need
Q345B ≤16 21 345 20
Q345C 16-35 22 ≥325 0
chemical composition:
Trademarks C Si Mn PSV Nb Al Ti
Q345A ≤ 0.20 ≤ 0.55 ≤ 1.70 ≤ 0.045 ≤ 0.045 0.02-0.15 0.015-0.060 0.02-0.20
Q345B ≤ 0.20 ≤ 0.55 ≤ 1.70 ≤ 0.040 ≤ 0.040 0.02-0.15 0.015-0.060 0.02-0.20
Q345C ≤ 0.20 ≤ 0.55 ≤ 1.70 ≤ 0.035 ≤ 0.035 0.02-0.15 0.015-0.060 ≥ 0.015 0.02-0.20
The main difference is that the carbon content of manganese is different:
Q235-A
Carbon-containing C: 0.14 to 0.22; manganese Mn: 0.30 to 0.65;
Q235-B
Carbon-containing C: 0.12 to 0.20; manganese Mn: 0.30 to 0.70;
For carburizing or cyanidation parts with low requirements for the strength of the heart, such as tie rods, connecting rods, hooks, bolts, shafts and welding parts, etc., the temperature should also be limited!
Especially the Q345E. Tens of degrees below zero.
In addition, relative to the old standard, the most obvious requirement of the new standard is to adjust the Mn content of the steel, from the original 1.0-1.60 to ≤ 1.70, and to cancel the minimum limit of ≥ 1.0.
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