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ASTM A572 Grade 50 vs GB/T 1591 Q345B

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

ASTM A572 Grade 50 (ASTM A572) and GB/T 1591 Q345B (GB/T 1591-2018) are both steel grades. Both fall under the Structural Steel category. ASTM A572 Grade 50 is typically used for high-strength low-alloy structural steel; buildings, bridges, transmission towers, construction equipment, general structural fabrication, while GB/T 1591 Q345B is commonly used for bridges, construction equipment, cranes, heavy structures, pressure vessels, machinery. ASTM A572 Grade 50 is defined under ASTM International, originating from United States, while GB/T 1591 Q345B is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, ASTM A572 Grade 50 vs GB/T 1591 Q345B 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 ASTM A572 Grade 50:
ASTM A572 Gr.65 ASTM A283C GOST 19281 09G2S CSA G40.21 260W CSA G40.21 300W AS/NZS 3679.1 300 AS/NZS 3679.1 350 CSA G40.21 480W CSA G40.21 400W CSA G40.21 400A CSA G40.21 350W ASTM A1008 SS Grade 80
Match Breakdown
CHEMISTRY MATCH
84.7%
MECHANICAL MATCH
33.3%
OVERALL
67.6%
Specifications
Property ASTM A572 Grade 50 GB/T 1591 Q345B
Standard ASTM A572 GB/T 1591-2018
Category Structural Steel Structural Steel
C (%) <=0.23 <=0.20
Mn (%) <=1.35 1.00-1.60
Si (%) <=0.40 <=0.50
P (%) <=0.040 <=0.035
S (%) <=0.050 <=0.035
Nb (%) <=0.05 <=0.07
V (%) <=0.15 <=0.20
Ti (%) Not specified <=0.20
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property ASTM A572 Grade 50 GB/T 1591 Q345B
Tensile Strength 450 MPa min 470-630 MPa
Yield Strength 345 MPa min >=345 MPa
Elongation 18% min >=21%
Hardness 137-187 HB Not specified
Impact Energy Not specified >=34 J
Typical Applications
ASTM A572 Grade 50
High-strength low-alloy structural steel; buildings, bridges, transmission towers, construction equipment, general structural fabrication
GB/T 1591 Q345B
bridges, construction equipment, cranes, heavy structures, pressure vessels, machinery
Key Differences
Can ASTM A572 Grade 50 Be Substituted With GB/T 1591 Q345B?
ASTM A572 Grade 50 and GB/T 1591 Q345B 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
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)
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)
On M-EX Right Now
ASTM A572 Grade 50
4 active listings and RFQs →
GB/T 1591 Q345B
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A572 Grade 50 and GB/T 1591 Q345B?
GB/T 1591 Q345B specifies Ti which is not specified for ASTM A572 Grade 50.
Can ASTM A572 Grade 50 be substituted with GB/T 1591 Q345B?
ASTM A572 Grade 50 and GB/T 1591 Q345B 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.