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GB/T 1591 Q345B vs GOST 19281 09G2S

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q345B (GB/T 1591-2018) and GOST 19281 09G2S (GOST 19281-2014) 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 GOST 19281 09G2S is commonly used for used for bridges, pressure vessels, pipelines, structural frames, and heavy equipment components.. GB/T 1591 Q345B is defined under Guobiao Standards (GB/T) (China).

As per chemical composition, GB/T 1591 Q345B vs GOST 19281 09G2S is a 57.4% match. As per mechanical properties, the match is 94.1%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With GB/T 1591 Q345B:
CSA G40.21 300W CSA G40.21 480W 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 ASTM A283C
Match Breakdown
CHEMISTRY MATCH
57.4%
MECHANICAL MATCH
94.1%
OVERALL
35%
Specifications
Property GB/T 1591 Q345B GOST 19281 09G2S
Standard GB/T 1591-2018 GOST 19281-2014
Category Structural Steel Structural Steel
C (%) <=0.20 0.07-0.12
Si (%) <=0.50 0.5-0.8
Mn (%) 1.00-1.60 1.3-1.7
S (%) <=0.035 0.04 max
P (%) <=0.035 0.035 max
V (%) <=0.20 Not specified
Nb (%) <=0.07 Not specified
Ti (%) <=0.20 Not specified
Ni (%) Not specified 0.3 max
Cr (%) Not specified 0.3 max
Cu (%) Not specified 0.3 max
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 GOST 19281 09G2S
Tensile Strength 470-630 MPa 490-640 MPa
Yield Strength >=345 MPa 345 MPa min
Elongation >=21% 21% min
Impact Energy >=34 J Not specified
Hardness Not specified 140-190 HB
Typical Applications
GB/T 1591 Q345B
bridges, construction equipment, cranes, heavy structures, pressure vessels, machinery
GOST 19281 09G2S
Used for bridges, pressure vessels, pipelines, structural frames, and heavy equipment components.
Key Differences
Can GB/T 1591 Q345B Be Substituted With GOST 19281 09G2S?
GB/T 1591 Q345B and GOST 19281 09G2S 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)
GOST 19281 09G2S
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2900–3800 mm (114.17–149.61 in)
On M-EX Right Now
GB/T 1591 Q345B
2 active listings and RFQs →
GOST 19281 09G2S
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q345B and GOST 19281 09G2S?
GB/T 1591 Q345B specifies V, Nb, Ti which are not specified for GOST 19281 09G2S. GOST 19281 09G2S specifies Ni, Cr, Cu which are not specified for GB/T 1591 Q345B.
Can GB/T 1591 Q345B be substituted with GOST 19281 09G2S?
GB/T 1591 Q345B and GOST 19281 09G2S 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.