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GB/T 1591 Q420C vs CSA G40.21 350W

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q420C (GB/T 1591:2018) and CSA G40.21 350W (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 350W is commonly used for used in buildings, bridges, cranes, transmission towers, heavy equipment, and structural fabrications.. GB/T 1591 Q420C is defined under Guobiao Standards (GB/T), originating from China, while CSA G40.21 350W is defined under Canadian Standards Association (CSA), originating from Canada.

As per chemical composition, GB/T 1591 Q420C vs CSA G40.21 350W is a 61.9% match. As per mechanical properties, the match is 47.8%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With GB/T 1591 Q420C:
CSA G40.21 400W CSA G40.21 480W
Other Structural Steel Grades to Compare With GB/T 1591 Q420C:
GOST 19281 09G2S CSA G40.21 260W AS/NZS 3679.1 300 CSA G40.21 300W AS/NZS 3679.1 350 CSA G40.21 400A ASTM A1008 SS Grade 50 ASTM A1008 SS Grade 80 ASTM A283C ASTM A572 Gr.65
Match Breakdown
CHEMISTRY MATCH
61.9%
MECHANICAL MATCH
47.8%
OVERALL
35%
Specifications
Property GB/T 1591 Q420C CSA G40.21 350W
Standard GB/T 1591:2018 CSA G40.21-13 (R2023)
Category Structural Steel Structural Steel
C (%) <=0.20 0.23 max
Si (%) <=0.55 0.15-0.40
Mn (%) <=1.70 0.50-1.50
P (%) <=0.030 0.040 max
S (%) <=0.030 0.050 max
Nb (%) <=0.05 Not specified
V (%) <=0.13 Not specified
Ti (%) <=0.05 Not specified
Cr (%) <=0.30 Not specified
Ni (%) <=0.80 Not specified
Cu (%) <=0.40 Not specified
Mo (%) <=0.20 Not specified
N (%) <=0.015 Not specified
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 350W
Tensile Strength 520-680 MPa 450-620 MPa
Yield Strength >=420 MPa 350 MPa min
Elongation >=20% 20% min
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
Hardness Not specified 135-180 HB
Typical Applications
GB/T 1591 Q420C
General structure for engineering (plates, strips, bars and sections)
CSA G40.21 350W
Used in buildings, bridges, cranes, transmission towers, heavy equipment, and structural fabrications.
Key Differences
Can GB/T 1591 Q420C Be Substituted With CSA G40.21 350W?
GB/T 1591 Q420C and CSA G40.21 350W 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.
Forms & Sizes Available on M-EX
GB/T 1591 Q420C
No active listings currently.
CSA G40.21 350W
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2700–3400 mm (106.3–133.86 in)
On M-EX Right Now
GB/T 1591 Q420C
0 active listings and RFQs →
CSA G40.21 350W
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q420C and CSA G40.21 350W?
GB/T 1591 Q420C specifies Nb, V, Ti, Cr which are not specified for CSA G40.21 350W.
Can GB/T 1591 Q420C be substituted with CSA G40.21 350W?
GB/T 1591 Q420C and CSA G40.21 350W 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.