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GB/T 1591 Q345B vs ASTM A1008 SS Grade 50

Related Material — 56.4% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q345B (GB/T 1591-2018) and ASTM A1008 SS Grade 50 (ASTM A1008) 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 A1008 SS Grade 50 is commonly used for cold-rolled high-strength structural steel sheet; automotive structural components, cold-formed parts requiring moderate strength. GB/T 1591 Q345B is defined under Guobiao Standards (GB/T), originating from China, while ASTM A1008 SS Grade 50 is defined under ASTM International, originating from United States.

As per chemical composition, GB/T 1591 Q345B vs ASTM A1008 SS Grade 50 is a 84.6% match. As per mechanical properties, the match is 0%. Combined, this makes them a related material overall at 56.4%.

Frequently Compared With GB/T 1591 Q345B:
CSA G40.21 300W CSA G40.21 480W CSA G40.21 400W GOST 19281 09G2S CSA G40.21 260W CSA G40.21 350W CSA G40.21 400A AS/NZS 3679.1 300 AS/NZS 3679.1 350 ASTM A572 Grade 50 ASTM A1008 SS Grade 80 ASTM A283C
Match Breakdown
CHEMISTRY MATCH
84.6%
MECHANICAL MATCH
0%
OVERALL
56.4%
Specifications
Property GB/T 1591 Q345B ASTM A1008 SS Grade 50
Standard GB/T 1591-2018 ASTM A1008
Category Structural Steel Structural Steel
C (%) <=0.20 <=0.20
Si (%) <=0.50 <=0.50
Mn (%) 1.00-1.60 <=1.35
S (%) <=0.035 <=0.040
P (%) <=0.035 <=0.040
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 A1008 SS Grade 50
Tensile Strength 470-630 MPa 380 MPa min
Yield Strength >=345 MPa 340 MPa min
Elongation >=21% 14% min
Impact Energy >=34 J Not specified
Typical Applications
GB/T 1591 Q345B
bridges, construction equipment, cranes, heavy structures, pressure vessels, machinery
ASTM A1008 SS Grade 50
Cold-rolled high-strength structural steel sheet; automotive structural components, cold-formed parts requiring moderate strength
Key Differences
Can GB/T 1591 Q345B Be Substituted With ASTM A1008 SS Grade 50?
GB/T 1591 Q345B and ASTM A1008 SS 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 A1008 SS Grade 50
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 →
ASTM A1008 SS Grade 50
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q345B and ASTM A1008 SS Grade 50?
GB/T 1591 Q345B specifies V, Nb, Ti which are not specified for ASTM A1008 SS Grade 50.
Can GB/T 1591 Q345B be substituted with ASTM A1008 SS Grade 50?
GB/T 1591 Q345B and ASTM A1008 SS 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.