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GB/T 1591 Q690MD vs GOST 19281 09G2S

Minimal Match — 29.9% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q690MD (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 Q690MD 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 Q690MD is defined under Guobiao Standards (GB/T) (China).

As per chemical composition, GB/T 1591 Q690MD vs GOST 19281 09G2S is a 44.8% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 29.9%.

Frequently Compared With GB/T 1591 Q690MD:
AS/NZS 3679.1 300 CSA G40.21 300W AS/NZS 3679.1 350 ASTM A283C ASTM A572 Gr.65 CSA G40.21 260W CSA G40.21 400W CSA G40.21 480W ASTM A1008 SS Grade 50
Other Structural Steel Grades to Compare With GB/T 1591 Q690MD:
CSA G40.21 350W CSA G40.21 400A ASTM A1008 SS Grade 80
Match Breakdown
CHEMISTRY MATCH
44.8%
MECHANICAL MATCH
0%
OVERALL
29.9%
Specifications
Property GB/T 1591 Q690MD GOST 19281 09G2S
Standard GB/T 1591:2018 GOST 19281-2014
Category Structural Steel Structural Steel
C (%) <=0.18 0.07-0.12
Si (%) <=0.60 0.5-0.8
Mn (%) <=2.00 1.3-1.7
P (%) <=0.030 0.035 max
S (%) <=0.025 0.04 max
Nb (%) 0.01-0.11 Not specified
V (%) 0.01-0.12 Not specified
Ti (%) 0.006-0.05 Not specified
Cr (%) <=1.00 0.3 max
Ni (%) <=0.80 0.3 max
Cu (%) <=0.80 0.3 max
Mo (%) <=0.30 Not specified
N (%) <=0.025 Not specified
B (%) <=0.004 Not specified
Al (%) >=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 Q690MD GOST 19281 09G2S
Tensile Strength 770-940 MPa 490-640 MPa
Yield Strength >=690 MPa 345 MPa min
Elongation >=14% 21% min
Condition Thermomechanical processed (TMCP), nominal thickness or diameter up to 16 mm (tensile strength: up to 40 mm) Not specified
Hardness Not specified 140-190 HB
Typical Applications
GB/T 1591 Q690MD
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 Q690MD Be Substituted With GOST 19281 09G2S?
GB/T 1591 Q690MD 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 Q690MD
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 Q690MD
0 active listings and RFQs →
GOST 19281 09G2S
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q690MD and GOST 19281 09G2S?
GB/T 1591 Q690MD specifies Nb, V, Ti, Mo which are not specified for GOST 19281 09G2S.
Can GB/T 1591 Q690MD be substituted with GOST 19281 09G2S?
GB/T 1591 Q690MD 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.