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GB/T 1591 Q390B vs GB/T 1591 Q390NB

Close Alternative — 81.9% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q390B (GB/T 1591:2018) and GB/T 1591 Q390NB (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 Q390NB 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 Q390NB is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 1591 Q390B vs GB/T 1591 Q390NB is a 89.5% match. As per mechanical properties, the match is 66.7%. Combined, this makes them a close alternative overall at 81.9%.

Frequently Compared With GB/T 1591 Q390B:
ASTM A283C
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
Match Breakdown
CHEMISTRY MATCH
89.5%
MECHANICAL MATCH
66.7%
OVERALL
81.9%
Specifications
Property GB/T 1591 Q390B GB/T 1591 Q390NB
Standard GB/T 1591:2018 GB/T 1591:2018
Category Structural Steel Structural Steel
C (%) <=0.20 <=0.20
Si (%) <=0.55 <=0.50
Mn (%) <=1.70 0.90-1.70
P (%) <=0.035 <=0.035
S (%) <=0.035 <=0.035
Nb (%) <=0.05 0.01-0.05
V (%) <=0.13 0.01-0.20
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 Q390NB
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 Normalized or normalizing rolled, nominal thickness or diameter up to 16 mm (tensile strength: up to 100 mm)
Typical Applications
GB/T 1591 Q390B
General structure for engineering (plates, strips, bars and sections)
GB/T 1591 Q390NB
General structure for engineering (plates, strips, bars and sections)
Key Differences
Can GB/T 1591 Q390B Be Substituted With GB/T 1591 Q390NB?
GB/T 1591 Q390B and GB/T 1591 Q390NB 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.
On M-EX Right Now
GB/T 1591 Q390B
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GB/T 1591 Q390NB
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Frequently Asked Questions
What is the difference between GB/T 1591 Q390B and GB/T 1591 Q390NB?
GB/T 1591 Q390NB specifies Al which is not specified for GB/T 1591 Q390B.
Can GB/T 1591 Q390B be substituted with GB/T 1591 Q390NB?
GB/T 1591 Q390B and GB/T 1591 Q390NB 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.