Post Stock Login Register

GB/T 1591 Q420MC vs CSA G40.21 350W

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

GB/T 1591 Q420MC (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 Q420MC 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 Q420MC 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 Q420MC vs CSA G40.21 350W is a 55.7% match. As per mechanical properties, the match is 14.5%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With GB/T 1591 Q420MC:
ASTM A1008 SS Grade 80 GOST 19281 09G2S CSA G40.21 260W AS/NZS 3679.1 300 CSA G40.21 300W CSA G40.21 400W CSA G40.21 480W ASTM A572 Gr.65
Other Structural Steel Grades to Compare With GB/T 1591 Q420MC:
AS/NZS 3679.1 350 CSA G40.21 400A ASTM A1008 SS Grade 50 ASTM A283C
Match Breakdown
CHEMISTRY MATCH
55.7%
MECHANICAL MATCH
14.5%
OVERALL
35%
Specifications
Property GB/T 1591 Q420MC CSA G40.21 350W
Standard GB/T 1591:2018 CSA G40.21-13 (R2023)
Category Structural Steel Structural Steel
C (%) <=0.16 0.23 max
Si (%) <=0.50 0.15-0.40
Mn (%) <=1.70 0.50-1.50
P (%) <=0.030 0.040 max
S (%) <=0.030 0.050 max
Nb (%) 0.01-0.05 Not specified
V (%) 0.01-0.12 Not specified
Ti (%) 0.006-0.05 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
Al (%) >=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 Q420MC CSA G40.21 350W
Tensile Strength 520-680 MPa 450-620 MPa
Yield Strength >=420 MPa 350 MPa min
Elongation >=19% 20% min
Condition Thermomechanical processed (TMCP), nominal thickness or diameter up to 16 mm (tensile strength: up to 40 mm) Not specified
Hardness Not specified 135-180 HB
Typical Applications
GB/T 1591 Q420MC
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 Q420MC Be Substituted With CSA G40.21 350W?
GB/T 1591 Q420MC 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 Q420MC
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 Q420MC
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 Q420MC and CSA G40.21 350W?
GB/T 1591 Q420MC specifies Nb, V, Ti, Cr which are not specified for CSA G40.21 350W.
Can GB/T 1591 Q420MC be substituted with CSA G40.21 350W?
GB/T 1591 Q420MC 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.