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GB/T 1591 Q345B vs CSA G40.21 400W

Related Material — 65.1% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q345B (GB/T 1591-2018) and CSA G40.21 400W (CSA G40.21-13 (R2023)) are both steel grades. Both fall under the Structural Steel category. GB/T 1591 Q345B is typically used for bridges, construction equipment, cranes, heavy structures, pressure vessels, machinery, while CSA G40.21 400W is commonly used for heavy structural fabrication, bridges, offshore platforms, cranes, pressure vessels, mining equipment.. GB/T 1591 Q345B is defined under Guobiao Standards (GB/T), originating from China, while CSA G40.21 400W is defined under Canadian Standards Association (CSA), originating from Canada.

As per chemical composition, GB/T 1591 Q345B vs CSA G40.21 400W is a 85.1% match. As per mechanical properties, the match is 25%. Combined, this makes them a related material overall at 65.1%.

Frequently Compared With GB/T 1591 Q345B:
CSA G40.21 300W CSA G40.21 480W GOST 19281 09G2S CSA G40.21 260W CSA G40.21 350W CSA G40.21 400A AS/NZS 3679.1 300 AS/NZS 3679.1 350 ASTM A1008 SS Grade 50 ASTM A572 Grade 50 ASTM A1008 SS Grade 80 ASTM A283C
Match Breakdown
CHEMISTRY MATCH
85.1%
MECHANICAL MATCH
25%
OVERALL
65.1%
Specifications
Property GB/T 1591 Q345B CSA G40.21 400W
Standard GB/T 1591-2018 CSA G40.21-13 (R2023)
Category Structural Steel Structural Steel
C (%) <=0.20 max 0.23
Si (%) <=0.50 max 0.5
Mn (%) 1.00-1.60 max 1.6
S (%) <=0.035 max 0.035
P (%) <=0.035 max 0.035
V (%) <=0.20 Not specified
Nb (%) <=0.07 Not specified
Ti (%) <=0.20 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 Q345B CSA G40.21 400W
Tensile Strength 470-630 MPa 520-690 MPa
Yield Strength >=345 MPa 400 MPa min
Elongation >=21% Not specified
Impact Energy >=34 J Not specified
Typical Applications
GB/T 1591 Q345B
bridges, construction equipment, cranes, heavy structures, pressure vessels, machinery
CSA G40.21 400W
Heavy structural fabrication, bridges, offshore platforms, cranes, pressure vessels, mining equipment.
Key Differences
Can GB/T 1591 Q345B Be Substituted With CSA G40.21 400W?
GB/T 1591 Q345B and CSA G40.21 400W 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 Q345B
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 3800–4000 mm (149.61–157.48 in)
CSA G40.21 400W
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2500–5200 mm (98.43–204.72 in)
On M-EX Right Now
GB/T 1591 Q345B
2 active listings and RFQs →
CSA G40.21 400W
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q345B and CSA G40.21 400W?
GB/T 1591 Q345B specifies V, Nb, Ti which are not specified for CSA G40.21 400W.
Can GB/T 1591 Q345B be substituted with CSA G40.21 400W?
GB/T 1591 Q345B and CSA G40.21 400W 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.