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GB/T 1591 Q390B vs GB/T 1591 Q390MD

Close Alternative — 82.6% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q390B (GB/T 1591:2018) and GB/T 1591 Q390MD (GB/T 1591:2018) are both steel grades. Both fall under the Structural Steel category. GB/T 1591 Q390B is typically used for general structure for engineering (plates, strips, bars and sections), while GB/T 1591 Q390MD is commonly used for general structure for engineering (plates, strips, bars and sections). GB/T 1591 Q390B is defined under Guobiao Standards (GB/T), originating from China, while GB/T 1591 Q390MD is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 1591 Q390B vs GB/T 1591 Q390MD is a 90.5% match. As per mechanical properties, the match is 66.7%. Combined, this makes them a close alternative overall at 82.6%.

Other Structural Steel Grades to Compare With GB/T 1591 Q390B:
GOST 19281 09G2S CSA G40.21 260W AS/NZS 3679.1 300 CSA G40.21 300W AS/NZS 3679.1 350 CSA G40.21 350W CSA G40.21 400A CSA G40.21 400W CSA G40.21 480W ASTM A1008 SS Grade 50 ASTM A1008 SS Grade 80 ASTM A283C
Match Breakdown
CHEMISTRY MATCH
90.5%
MECHANICAL MATCH
66.7%
OVERALL
82.6%
Specifications
Property GB/T 1591 Q390B GB/T 1591 Q390MD
Standard GB/T 1591:2018 GB/T 1591:2018
Category Structural Steel Structural Steel
C (%) <=0.20 <=0.15
Si (%) <=0.55 <=0.50
Mn (%) <=1.70 <=1.70
P (%) <=0.035 <=0.030
S (%) <=0.035 <=0.025
Nb (%) <=0.05 0.01-0.05
V (%) <=0.13 0.01-0.12
Ti (%) <=0.05 0.006-0.05
Cr (%) <=0.30 <=0.30
Ni (%) <=0.50 <=0.50
Cu (%) <=0.40 <=0.40
Mo (%) <=0.10 <=0.10
N (%) <=0.015 <=0.015
Al (%) Not specified >=0.015
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 Q390B GB/T 1591 Q390MD
Tensile Strength 490-650 MPa 490-650 MPa
Yield Strength >=390 MPa >=390 MPa
Elongation >=21% >=20%
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 Thermomechanical processed (TMCP), nominal thickness or diameter up to 16 mm (tensile strength: up to 40 mm)
Typical Applications
GB/T 1591 Q390B
General structure for engineering (plates, strips, bars and sections)
GB/T 1591 Q390MD
General structure for engineering (plates, strips, bars and sections)
Key Differences
Can GB/T 1591 Q390B Be Substituted With GB/T 1591 Q390MD?
GB/T 1591 Q390B and GB/T 1591 Q390MD are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
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GB/T 1591 Q390B
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GB/T 1591 Q390MD
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Frequently Asked Questions
What is the difference between GB/T 1591 Q390B and GB/T 1591 Q390MD?
GB/T 1591 Q390MD specifies Al which is not specified for GB/T 1591 Q390B.
Can GB/T 1591 Q390B be substituted with GB/T 1591 Q390MD?
GB/T 1591 Q390B and GB/T 1591 Q390MD are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.