Minimal Match — 35% match
based on chemical composition and mechanical property overlap.
GB/T 1591 Q420C (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 Q420C is typically used for general structure for engineering (plates, strips, bars and sections), while CSA G40.21 300W is commonly used for structural fabrication,bridges,buildings,machinery frames,general construction,welded structures.
GB/T 1591 Q420C 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 Q420C vs CSA G40.21 300W is a 61.5% match.
As per mechanical properties, the match is 14.5%.
Combined, this makes them a minimal match overall at 35%.
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 Q420C
CSA G40.21 300W
Tensile Strength
520-680 MPa
450-620 MPa
Yield Strength
>=420 MPa
300 MPa min
Elongation
>=20%
20-23 %
Condition
Hot-rolled (as-rolled), nominal thickness or diameter up to 16 mm for yield; tensile strength for up to 100 mm; elongation longitudinal, up to 40 mm
Not specified
Typical Applications
GB/T 1591 Q420C
General structure for engineering (plates, strips, bars and sections)
GB/T 1591 Q420C specifies Si, Nb, V, Ti which are not specified for CSA G40.21 300W.
Can GB/T 1591 Q420C Be Substituted With CSA G40.21 300W?
GB/T 1591 Q420C 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 Q420C and CSA G40.21 300W?
GB/T 1591 Q420C specifies Si, Nb, V, Ti which are not specified for CSA G40.21 300W.
Can GB/T 1591 Q420C be substituted with CSA G40.21 300W?
GB/T 1591 Q420C 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.