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GB/T 1591 Q690MD vs ASTM A1008 SS Grade 50

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

GB/T 1591 Q690MD (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 Q690MD is typically used for general structure for engineering (plates, strips, bars and sections), 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 Q690MD 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 Q690MD vs ASTM A1008 SS Grade 50 is a 50.9% match. As per mechanical properties, the match is 33.3%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With GB/T 1591 Q690MD:
AS/NZS 3679.1 300 ASTM A283C CSA G40.21 260W CSA G40.21 300W AS/NZS 3679.1 350 CSA G40.21 400W ASTM A572 Gr.65
Other Structural Steel Grades to Compare With GB/T 1591 Q690MD:
GOST 19281 09G2S CSA G40.21 350W CSA G40.21 400A CSA G40.21 480W ASTM A1008 SS Grade 80
Match Breakdown
CHEMISTRY MATCH
50.9%
MECHANICAL MATCH
33.3%
OVERALL
35%
Specifications
Property GB/T 1591 Q690MD ASTM A1008 SS Grade 50
Standard GB/T 1591:2018 ASTM A1008
Category Structural Steel Structural Steel
C (%) <=0.18 <=0.20
Si (%) <=0.60 <=0.50
Mn (%) <=2.00 <=1.35
P (%) <=0.030 <=0.040
S (%) <=0.025 <=0.040
Nb (%) 0.01-0.11 Not specified
V (%) 0.01-0.12 Not specified
Ti (%) 0.006-0.05 Not specified
Cr (%) <=1.00 Not specified
Ni (%) <=0.80 Not specified
Cu (%) <=0.80 Not specified
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 ASTM A1008 SS Grade 50
Tensile Strength 770-940 MPa 380 MPa min
Yield Strength >=690 MPa 340 MPa min
Elongation >=14% 14% min
Condition Thermomechanical processed (TMCP), nominal thickness or diameter up to 16 mm (tensile strength: up to 40 mm) Not specified
Typical Applications
GB/T 1591 Q690MD
General structure for engineering (plates, strips, bars and sections)
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 Q690MD Be Substituted With ASTM A1008 SS Grade 50?
GB/T 1591 Q690MD 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 Q690MD
No active listings currently.
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 Q690MD
0 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 Q690MD and ASTM A1008 SS Grade 50?
GB/T 1591 Q690MD specifies Nb, V, Ti, Cr which are not specified for ASTM A1008 SS Grade 50.
Can GB/T 1591 Q690MD be substituted with ASTM A1008 SS Grade 50?
GB/T 1591 Q690MD 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.