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GB/T 1591 Q690MD vs CSA G40.21 300W

Minimal Match — 30.4% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q690MD (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 Q690MD 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 Q690MD 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 Q690MD vs CSA G40.21 300W is a 45.7% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 30.4%.

Frequently Compared With GB/T 1591 Q690MD:
AS/NZS 3679.1 300 ASTM A283C ASTM A572 Gr.65 CSA G40.21 260W AS/NZS 3679.1 350 CSA G40.21 400W CSA G40.21 480W ASTM A1008 SS Grade 50
Other Structural Steel Grades to Compare With GB/T 1591 Q690MD:
GOST 19281 09G2S CSA G40.21 350W CSA G40.21 400A ASTM A1008 SS Grade 80
Match Breakdown
CHEMISTRY MATCH
45.7%
MECHANICAL MATCH
0%
OVERALL
30.4%
Specifications
Property GB/T 1591 Q690MD CSA G40.21 300W
Standard GB/T 1591:2018 CSA G40.21-13 (R2023)
Category Structural Steel Structural Steel
C (%) <=0.18 <=0.23
Si (%) <=0.60 Not specified
Mn (%) <=2.00 <=1.50
P (%) <=0.030 <=0.040
S (%) <=0.025 <=0.050
Nb (%) 0.01-0.11 Not specified
V (%) 0.01-0.12 Not specified
Ti (%) 0.006-0.05 Not specified
Cr (%) <=1.00 Not specified
Ni (%) <=0.80 Not specified
Cu (%) <=0.80 Not specified
Mo (%) <=0.30 Not specified
N (%) <=0.025 Not specified
B (%) <=0.004 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 Q690MD CSA G40.21 300W
Tensile Strength 770-940 MPa 450-620 MPa
Yield Strength >=690 MPa 300 MPa min
Elongation >=14% 20-23 %
Condition Thermomechanical processed (TMCP), nominal thickness or diameter up to 16 mm (tensile strength: up to 40 mm) Not specified
Typical Applications
GB/T 1591 Q690MD
General structure for engineering (plates, strips, bars and sections)
CSA G40.21 300W
structural fabrication,bridges,buildings,machinery frames,general construction,welded structures
Key Differences
Can GB/T 1591 Q690MD Be Substituted With CSA G40.21 300W?
GB/T 1591 Q690MD 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.
Forms & Sizes Available on M-EX
GB/T 1591 Q690MD
No active listings currently.
CSA G40.21 300W
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2700–2800 mm (106.3–110.24 in)
On M-EX Right Now
GB/T 1591 Q690MD
0 active listings and RFQs →
CSA G40.21 300W
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q690MD and CSA G40.21 300W?
GB/T 1591 Q690MD specifies Si, Nb, V, Ti which are not specified for CSA G40.21 300W.
Can GB/T 1591 Q690MD be substituted with CSA G40.21 300W?
GB/T 1591 Q690MD 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.