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GB/T 700 Q235 vs CSA G40.21 400A

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

GB/T 700 Q235 (GB/T 700-2006) and CSA G40.21 400A (CSA G40.21-13 (R2023)) are both steel grades. Both fall under the Structural Steel category. GB/T 700 Q235 is typically used for general structural fabrication, bridges, buildings, while CSA G40.21 400A is commonly used for atmospheric corrosion-resistant (weathering) structural steel; exposed bridge girders and structural members where high strength and weathering resistance are both needed. GB/T 700 Q235 is defined under Guobiao Standards (GB/T), originating from China, while CSA G40.21 400A is defined under Canadian Standards Association (CSA), originating from Canada.

As per chemical composition, GB/T 700 Q235 vs CSA G40.21 400A is a 79.4% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With GB/T 700 Q235:
GOST 19281 09G2S CSA G40.21 350W ASTM A1008 SS Grade 50 ASTM A572 Gr.65 ASTM A1008 SS Grade 80 CSA G40.21 400W CSA G40.21 300W AS/NZS 3679.1 350 AS/NZS 3679.1 300 ASTM A283C CSA G40.21 480W CSA G40.21 260W
Match Breakdown
CHEMISTRY MATCH
79.4%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property GB/T 700 Q235 CSA G40.21 400A
Standard GB/T 700-2006 CSA G40.21-13 (R2023)
Category Structural Steel Structural Steel
C (%) ≤0.22 <=0.23
Mn (%) 0.30–0.70 <=1.60
Si (%) ≤0.35 <=0.40
S (%) ≤0.050 <=0.035
P (%) ≤0.045 <=0.035
Cu (%) Not specified 0.20-0.40
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 700 Q235 CSA G40.21 400A
Tensile Strength 375–500 MPa 520-670 MPa
Yield Strength ≥235 MPa 400 MPa min
Elongation ≥26% 17% min
Impact Not specified 27J at 0°C
Typical Applications
GB/T 700 Q235
General structural fabrication, bridges, buildings
CSA G40.21 400A
Atmospheric corrosion-resistant (weathering) structural steel; exposed bridge girders and structural members where high strength and weathering resistance are both needed
Key Differences
Can GB/T 700 Q235 Be Substituted With CSA G40.21 400A?
GB/T 700 Q235 and CSA G40.21 400A 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 700 Q235
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 3100–3700 mm (122.05–145.67 in)
CSA G40.21 400A
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2800–4200 mm (110.24–165.35 in)
On M-EX Right Now
GB/T 700 Q235
2 active listings and RFQs →
CSA G40.21 400A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 700 Q235 and CSA G40.21 400A?
CSA G40.21 400A specifies Cu which is not specified for GB/T 700 Q235.
Can GB/T 700 Q235 be substituted with CSA G40.21 400A?
GB/T 700 Q235 and CSA G40.21 400A 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.