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GB/T 1591 Q345B vs ASTM A572/A572M Grade 50

Related Material — 65.9% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q345B (GB/T 1591-2018) and ASTM A572/A572M Grade 50 (ASTM A572/A572M:2021) 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 A572/A572M Grade 50 is commonly used for riveted, bolted or welded structures. GB/T 1591 Q345B is defined under Guobiao Standards (GB/T), originating from China, while ASTM A572/A572M Grade 50 is defined under ASTM International, originating from United States.

As per chemical composition, GB/T 1591 Q345B vs ASTM A572/A572M Grade 50 is a 82.3% match. As per mechanical properties, the match is 33.3%. Combined, this makes them a related material overall at 65.9%.

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 AS/NZS 3679.1 300 CSA G40.21 350W CSA G40.21 400A ASTM A1008 SS Grade 50 AS/NZS 3679.1 350 ASTM A572 Grade 50 ASTM A1008 SS Grade 80
Match Breakdown
CHEMISTRY MATCH
82.3%
MECHANICAL MATCH
33.3%
OVERALL
65.9%
Specifications
Property GB/T 1591 Q345B ASTM A572/A572M Grade 50
Standard GB/T 1591-2018 ASTM A572/A572M:2021
Category Structural Steel Structural Steel
C (%) <=0.20 <=0.23
Si (%) <=0.50 <=0.40
Mn (%) 1.00-1.60 <=1.35
S (%) <=0.035 <=0.030
P (%) <=0.035 <=0.030
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 A572/A572M Grade 50
Tensile Strength 470-630 MPa >=450 MPa
Yield Strength >=345 MPa >=345 MPa
Elongation >=21% >=18%
Impact Energy >=34 J Not specified
Condition Not specified Tension test per Table 4; one set of minimum values for all product thicknesses; Elongation is in 200 mm gauge length, 50 mm values in the tensile block
Typical Applications
GB/T 1591 Q345B
bridges, construction equipment, cranes, heavy structures, pressure vessels, machinery
ASTM A572/A572M Grade 50
Riveted, bolted or welded structures
Key Differences
Can GB/T 1591 Q345B Be Substituted With ASTM A572/A572M Grade 50?
GB/T 1591 Q345B and ASTM A572/A572M Grade 50 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 A572/A572M Grade 50
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On M-EX Right Now
GB/T 1591 Q345B
2 active listings and RFQs →
ASTM A572/A572M Grade 50
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Frequently Asked Questions
What is the difference between GB/T 1591 Q345B and ASTM A572/A572M Grade 50?
GB/T 1591 Q345B specifies V, Nb, Ti which are not specified for ASTM A572/A572M Grade 50.
Can GB/T 1591 Q345B be substituted with ASTM A572/A572M Grade 50?
GB/T 1591 Q345B and ASTM A572/A572M Grade 50 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.