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GB/T 1591 Q345B vs CSA G40.21 350W

Related Material — 63.6% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q345B (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 Q345B is typically used for bridges, construction equipment, cranes, heavy structures, pressure vessels, machinery, while CSA G40.21 350W is commonly used for used in buildings, bridges, cranes, transmission towers, heavy equipment, and structural fabrications.. GB/T 1591 Q345B 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 Q345B vs CSA G40.21 350W is a 81.5% match. As per mechanical properties, the match is 27.8%. Combined, this makes them a related material overall at 63.6%.

Frequently Compared With GB/T 1591 Q345B:
CSA G40.21 300W CSA G40.21 480W GOST 19281 09G2S CSA G40.21 400W CSA G40.21 260W 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
81.5%
MECHANICAL MATCH
27.8%
OVERALL
63.6%
Specifications
Property GB/T 1591 Q345B 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 (%) <=0.50 0.15-0.40
Mn (%) 1.00-1.60 0.50-1.50
S (%) <=0.035 0.050 max
P (%) <=0.035 0.040 max
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 350W
Tensile Strength 470-630 MPa 450-620 MPa
Yield Strength >=345 MPa 350 MPa min
Elongation >=21% 20% min
Impact Energy >=34 J Not specified
Hardness Not specified 135-180 HB
Typical Applications
GB/T 1591 Q345B
bridges, construction equipment, cranes, heavy structures, pressure vessels, machinery
CSA G40.21 350W
Used in buildings, bridges, cranes, transmission towers, heavy equipment, and structural fabrications.
Key Differences
Can GB/T 1591 Q345B Be Substituted With CSA G40.21 350W?
GB/T 1591 Q345B 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 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 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 Q345B
2 active listings and RFQs →
CSA G40.21 350W
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q345B and CSA G40.21 350W?
GB/T 1591 Q345B specifies V, Nb, Ti which are not specified for CSA G40.21 350W.
Can GB/T 1591 Q345B be substituted with CSA G40.21 350W?
GB/T 1591 Q345B 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.