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GB/T 1591 Q345B vs ASTM A283C

Related Material — 56.1% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q345B (GB/T 1591-2018) and ASTM A283C (ASTM A283) 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 ASTM A283C is commonly used for used for structural fabrication, storage tanks, buildings, bridges, machinery bases, and welded structures.. GB/T 1591 Q345B is defined under Guobiao Standards (GB/T), originating from China, while ASTM A283C is defined under ASTM International, originating from United States.

As per chemical composition, GB/T 1591 Q345B vs ASTM A283C is a 81.2% match. As per mechanical properties, the match is 6%. Combined, this makes them a related material overall at 56.1%.

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 CSA G40.21 350W ASTM A1008 SS Grade 50 ASTM A572 Grade 50 ASTM A1008 SS Grade 80
Match Breakdown
CHEMISTRY MATCH
81.2%
MECHANICAL MATCH
6%
OVERALL
56.1%
Specifications
Property GB/T 1591 Q345B ASTM A283C
Standard GB/T 1591-2018 ASTM A283
Category Structural Steel Structural Steel
C (%) <=0.20 0.24 max
Si (%) <=0.50 0.40 max
Mn (%) 1.00-1.60 0.90 max
S (%) <=0.035 0.040 max
P (%) <=0.035 0.035 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 ASTM A283C
Tensile Strength 470-630 MPa 380-515 MPa
Yield Strength >=345 MPa 205 MPa min
Elongation >=21% 23-27%
Impact Energy >=34 J Not specified
Hardness Not specified 120-170 HB
Typical Applications
GB/T 1591 Q345B
bridges, construction equipment, cranes, heavy structures, pressure vessels, machinery
ASTM A283C
Used for structural fabrication, storage tanks, buildings, bridges, machinery bases, and welded structures.
Key Differences
Can GB/T 1591 Q345B Be Substituted With ASTM A283C?
GB/T 1591 Q345B and ASTM A283C 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)
ASTM A283C
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2900–3700 mm (114.17–145.67 in)
On M-EX Right Now
GB/T 1591 Q345B
2 active listings and RFQs →
ASTM A283C
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q345B and ASTM A283C?
GB/T 1591 Q345B specifies V, Nb, Ti which are not specified for ASTM A283C.
Can GB/T 1591 Q345B be substituted with ASTM A283C?
GB/T 1591 Q345B and ASTM A283C 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.