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GB/T 1591 Q420B vs GOST 19281 09G2S

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

GB/T 1591 Q420B (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 Q420B is typically used for general structure for engineering (plates, strips, bars and sections), while GOST 19281 09G2S is commonly used for used for bridges, pressure vessels, pipelines, structural frames, and heavy equipment components.. GB/T 1591 Q420B is defined under Guobiao Standards (GB/T) (China).

As per chemical composition, GB/T 1591 Q420B vs GOST 19281 09G2S is a 65.5% match. As per mechanical properties, the match is 21.1%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With GB/T 1591 Q420B:
AS/NZS 3679.1 300 CSA G40.21 300W ASTM A572 Gr.65 CSA G40.21 260W AS/NZS 3679.1 350 CSA G40.21 350W CSA G40.21 480W ASTM A1008 SS Grade 50 ASTM A283C
Other Structural Steel Grades to Compare With GB/T 1591 Q420B:
CSA G40.21 400A CSA G40.21 400W ASTM A1008 SS Grade 80
Match Breakdown
CHEMISTRY MATCH
65.5%
MECHANICAL MATCH
21.1%
OVERALL
35%
Specifications
Property GB/T 1591 Q420B GOST 19281 09G2S
Standard GB/T 1591:2018 GOST 19281-2014
Category Structural Steel Structural Steel
C (%) <=0.20 0.07-0.12
Si (%) <=0.55 0.5-0.8
Mn (%) <=1.70 1.3-1.7
P (%) <=0.035 0.035 max
S (%) <=0.035 0.04 max
Nb (%) <=0.05 Not specified
V (%) <=0.13 Not specified
Ti (%) <=0.05 Not specified
Cr (%) <=0.30 0.3 max
Ni (%) <=0.80 0.3 max
Cu (%) <=0.40 0.3 max
Mo (%) <=0.20 Not specified
N (%) <=0.015 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 Q420B GOST 19281 09G2S
Tensile Strength 520-680 MPa 490-640 MPa
Yield Strength >=420 MPa 345 MPa min
Elongation >=20% 21% min
Condition Hot-rolled (as-rolled), nominal thickness or diameter up to 16 mm for yield; tensile strength for up to 100 mm; elongation longitudinal, up to 40 mm Not specified
Hardness Not specified 140-190 HB
Typical Applications
GB/T 1591 Q420B
General structure for engineering (plates, strips, bars and sections)
GOST 19281 09G2S
Used for bridges, pressure vessels, pipelines, structural frames, and heavy equipment components.
Key Differences
Can GB/T 1591 Q420B Be Substituted With GOST 19281 09G2S?
GB/T 1591 Q420B 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 Q420B
No active listings currently.
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 Q420B
0 active listings and RFQs →
GOST 19281 09G2S
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q420B and GOST 19281 09G2S?
GB/T 1591 Q420B specifies Nb, V, Ti, Mo which are not specified for GOST 19281 09G2S.
Can GB/T 1591 Q420B be substituted with GOST 19281 09G2S?
GB/T 1591 Q420B 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.