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GB/T 1591 Q345B vs ASTM A1008 SS Grade 80

Related Material — 55.8% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q345B (GB/T 1591-2018) and ASTM A1008 SS Grade 80 (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 80 is commonly used for cold-rolled high-strength structural steel sheet, higher strength grade; automotive structural/reinforcement components, cold-formed high-strength parts. GB/T 1591 Q345B is defined under Guobiao Standards (GB/T), originating from China, while ASTM A1008 SS Grade 80 is defined under ASTM International, originating from United States.

As per chemical composition, GB/T 1591 Q345B vs ASTM A1008 SS Grade 80 is a 83.7% match. As per mechanical properties, the match is 0%. Combined, this makes them a related material overall at 55.8%.

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 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 A283C
Match Breakdown
CHEMISTRY MATCH
83.7%
MECHANICAL MATCH
0%
OVERALL
55.8%
Specifications
Property GB/T 1591 Q345B ASTM A1008 SS Grade 80
Standard GB/T 1591-2018 ASTM A1008
Category Structural Steel Structural Steel
C (%) <=0.20 <=0.25
Si (%) <=0.50 <=0.50
Mn (%) 1.00-1.60 <=1.65
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 80
Tensile Strength 470-630 MPa 570 MPa min
Yield Strength >=345 MPa 550 MPa min
Elongation >=21% 10% 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 80
Cold-rolled high-strength structural steel sheet, higher strength grade; automotive structural/reinforcement components, cold-formed high-strength parts
Key Differences
Can GB/T 1591 Q345B Be Substituted With ASTM A1008 SS Grade 80?
GB/T 1591 Q345B and ASTM A1008 SS Grade 80 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 80
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2500–3700 mm (98.43–145.67 in)
On M-EX Right Now
GB/T 1591 Q345B
2 active listings and RFQs →
ASTM A1008 SS Grade 80
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q345B and ASTM A1008 SS Grade 80?
GB/T 1591 Q345B specifies V, Nb, Ti which are not specified for ASTM A1008 SS Grade 80.
Can GB/T 1591 Q345B be substituted with ASTM A1008 SS Grade 80?
GB/T 1591 Q345B and ASTM A1008 SS Grade 80 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.