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GB/T 1591 Q390NB vs GB/T 1591 Q390B

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

GB/T 1591 Q390NB (GB/T 1591:2018) and GB/T 1591 Q390B (GB/T 1591:2018) are both steel grades. Both fall under the Structural Steel category. GB/T 1591 Q390NB is typically used for general structure for engineering (plates, strips, bars and sections), while GB/T 1591 Q390B is commonly used for general structure for engineering (plates, strips, bars and sections). GB/T 1591 Q390NB is defined under Guobiao Standards (GB/T), originating from China, while GB/T 1591 Q390B is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 1591 Q390NB vs GB/T 1591 Q390B 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%.

Other Structural Steel Grades to Compare With GB/T 1591 Q390NB:
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
89.5%
MECHANICAL MATCH
66.7%
OVERALL
81.9%
Specifications
Property GB/T 1591 Q390NB GB/T 1591 Q390B
Standard GB/T 1591:2018 GB/T 1591:2018
Category Structural Steel Structural Steel
C (%) <=0.20 <=0.20
Si (%) <=0.50 <=0.55
Mn (%) 0.90-1.70 <=1.70
P (%) <=0.035 <=0.035
S (%) <=0.035 <=0.035
Nb (%) 0.01-0.05 <=0.05
V (%) 0.01-0.20 <=0.13
Ti (%) 0.006-0.05 <=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 (%) >=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 Q390NB GB/T 1591 Q390B
Tensile Strength 490-650 MPa 490-650 MPa
Yield Strength >=390 MPa >=390 MPa
Elongation >=20% >=21%
Condition Normalized or normalizing rolled, nominal thickness or diameter up to 16 mm (tensile strength: up to 100 mm) 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
Typical Applications
GB/T 1591 Q390NB
General structure for engineering (plates, strips, bars and sections)
GB/T 1591 Q390B
General structure for engineering (plates, strips, bars and sections)
Key Differences
Can GB/T 1591 Q390NB Be Substituted With GB/T 1591 Q390B?
GB/T 1591 Q390NB and GB/T 1591 Q390B 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 Q390NB
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GB/T 1591 Q390B
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Frequently Asked Questions
What is the difference between GB/T 1591 Q390NB and GB/T 1591 Q390B?
GB/T 1591 Q390NB specifies Al which is not specified for GB/T 1591 Q390B.
Can GB/T 1591 Q390NB be substituted with GB/T 1591 Q390B?
GB/T 1591 Q390NB and GB/T 1591 Q390B 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.