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GB/T 1591 Q345B vs ASTM A572 Grade 50

Related Material — 67.6% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q345B (GB/T 1591-2018) and ASTM A572 Grade 50 (ASTM A572) 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 Grade 50 is commonly used for high-strength low-alloy structural steel; buildings, bridges, transmission towers, construction equipment, general structural fabrication. GB/T 1591 Q345B is defined under Guobiao Standards (GB/T), originating from China, while ASTM A572 Grade 50 is defined under ASTM International, originating from United States.

As per chemical composition, GB/T 1591 Q345B vs ASTM A572 Grade 50 is a 84.7% match. As per mechanical properties, the match is 33.3%. Combined, this makes them a related material overall at 67.6%.

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 CSA G40.21 350W ASTM A1008 SS Grade 50 ASTM A1008 SS Grade 80 ASTM A283C
Match Breakdown
CHEMISTRY MATCH
84.7%
MECHANICAL MATCH
33.3%
OVERALL
67.6%
Specifications
Property GB/T 1591 Q345B ASTM A572 Grade 50
Standard GB/T 1591-2018 ASTM A572
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 <=0.050
P (%) <=0.035 <=0.040
V (%) <=0.20 <=0.15
Nb (%) <=0.07 <=0.05
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 Grade 50
Tensile Strength 470-630 MPa 450 MPa min
Yield Strength >=345 MPa 345 MPa min
Elongation >=21% 18% min
Impact Energy >=34 J Not specified
Hardness Not specified 137-187 HB
Typical Applications
GB/T 1591 Q345B
bridges, construction equipment, cranes, heavy structures, pressure vessels, machinery
ASTM A572 Grade 50
High-strength low-alloy structural steel; buildings, bridges, transmission towers, construction equipment, general structural fabrication
Key Differences
Can GB/T 1591 Q345B Be Substituted With ASTM A572 Grade 50?
GB/T 1591 Q345B and ASTM A572 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 Grade 50
Plate → (4 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2800–4600 mm (110.24–181.1 in)
On M-EX Right Now
GB/T 1591 Q345B
2 active listings and RFQs →
ASTM A572 Grade 50
4 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q345B and ASTM A572 Grade 50?
GB/T 1591 Q345B specifies Ti which is not specified for ASTM A572 Grade 50.
Can GB/T 1591 Q345B be substituted with ASTM A572 Grade 50?
GB/T 1591 Q345B and ASTM A572 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.