Related Material — 61.5% match
based on chemical composition and mechanical property overlap.
GB/T 1591 Q345B (GB/T 1591-2018) and CSA G40.21 300W (CSA G40.21-13 (R2023)) are both steel grades.
Both fall under the Structural Steel category.
GB/T 1591 Q345B is typically used for bridges, construction equipment, cranes, heavy structures, pressure vessels, machinery, while CSA G40.21 300W is commonly used for structural fabrication,bridges,buildings,machinery frames,general construction,welded structures.
GB/T 1591 Q345B is defined under Guobiao Standards (GB/T), originating from China, while CSA G40.21 300W is defined under Canadian Standards Association (CSA), originating from Canada.
As per chemical composition, GB/T 1591 Q345B vs CSA G40.21 300W is a 78.4% match.
As per mechanical properties, the match is 27.8%.
Combined, this makes them a related material overall at 61.5%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
GB/T 1591 Q345B
CSA G40.21 300W
Tensile Strength
470-630 MPa
450-620 MPa
Yield Strength
>=345 MPa
300 MPa min
Elongation
>=21%
20-23 %
Impact Energy
>=34 J
Not specified
Typical Applications
GB/T 1591 Q345B
bridges, construction equipment, cranes, heavy structures, pressure vessels, machinery
GB/T 1591 Q345B specifies Si, V, Nb, Ti which are not specified for CSA G40.21 300W.
Can GB/T 1591 Q345B Be Substituted With CSA G40.21 300W?
GB/T 1591 Q345B and CSA G40.21 300W share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
What is the difference between GB/T 1591 Q345B and CSA G40.21 300W?
GB/T 1591 Q345B specifies Si, V, Nb, Ti which are not specified for CSA G40.21 300W.
Can GB/T 1591 Q345B be substituted with CSA G40.21 300W?
GB/T 1591 Q345B and CSA G40.21 300W share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.