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ASTM A36 Steel plate equivalent grade Q235B in China steel plate

ASTM A36 Steel plate equivalent grade is Q235B in China. The two equivalent steel grades have much in common without any doubt. However, you will get to know that there are many difference between ASTM A36 steel plate and Q235B steel plate also if you check carefully the technical data comparison between Q235B and A36 as below :

ASTM A36 Steel plate equivalent grade Q235B and A36 steel contrast table (1):

Grade Chemical composition %
C Si Mn P S Cu
Q235B 0.2 max 0.35 max 1.40 max 0.045 max 0.045 max -
A36 0.26 max 0.40 max - 0.04 max 0.05 max 0.20 min

When steel plate thickness upper than 20mm, A36 steel plate Mn is 0.8%-1.20%, while ASTM A36 Steel plate equivalent grade Q235B is 0.30%-0.70%

ASTM A36 Steel plate equivalent grade Q235B and A36 steel contrast table (2) --- mechanical properties:

Grade Yield strength ReH/(N/mm2) (t≤16mm) min Tensile strength Rm/(N/mm2) (3mm≤t≤16mm) Elongation A/% (3mm≤t≤40mm) min Charpy V test
Temperature/℃ Impact energy (Longitudinal)/J min
Q235B 235 370-500 26 20 27
A36 250 400-550 23 - -

The minimum yield point of ASTM A36 Steel plate is 250 MPa, tensile strength is 400MPa-550MPa. While the minimum yield point of ASTM A36 Steel plate equivalent grade Q235B is 235MPa, tensile strength is 375MPa-460Mpa. That means some Q235B will not meet A36 requirements.

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