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GB/T 1591 Q355MF vs GB/T 1591 Q355MB

Strong Match — 97.8% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q355MF (GB/T 1591:2018) and GB/T 1591 Q355MB (GB/T 1591:2018) are both steel grades. Both fall under the Structural Steel category. GB/T 1591 Q355MF is typically used for general structure for engineering (plates, strips, bars and sections), while GB/T 1591 Q355MB is commonly used for general structure for engineering (plates, strips, bars and sections). GB/T 1591 Q355MF is defined under Guobiao Standards (GB/T), originating from China, while GB/T 1591 Q355MB is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 1591 Q355MF vs GB/T 1591 Q355MB is a 96.7% match. As per mechanical properties, the match is 100%. Combined, this makes them a strong match overall at 97.8%.

Other Structural Steel Grades to Compare With GB/T 1591 Q355MF:
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
96.7%
MECHANICAL MATCH
100%
OVERALL
97.8%
Specifications
Property GB/T 1591 Q355MF GB/T 1591 Q355MB
Standard GB/T 1591:2018 GB/T 1591:2018
Category Structural Steel Structural Steel
C (%) <=0.14 <=0.14
Si (%) <=0.50 <=0.50
Mn (%) <=1.60 <=1.60
P (%) <=0.020 <=0.035
S (%) <=0.010 <=0.035
Nb (%) 0.01-0.05 0.01-0.05
V (%) 0.01-0.10 0.01-0.10
Ti (%) 0.006-0.05 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 (%) >=0.015 >=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 Q355MF GB/T 1591 Q355MB
Tensile Strength 470-630 MPa 470-630 MPa
Yield Strength >=355 MPa >=355 MPa
Elongation >=22% >=22%
Condition Thermomechanical processed (TMCP), nominal thickness or diameter up to 16 mm (tensile strength: 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 Q355MF
General structure for engineering (plates, strips, bars and sections)
GB/T 1591 Q355MB
General structure for engineering (plates, strips, bars and sections)
Can GB/T 1591 Q355MF Be Substituted With GB/T 1591 Q355MB?
GB/T 1591 Q355MF and GB/T 1591 Q355MB overlap closely enough on chemistry and mechanical properties that GB/T 1591 Q355MB is often considered as a substitute for GB/T 1591 Q355MF in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
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GB/T 1591 Q355MF
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GB/T 1591 Q355MB
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Frequently Asked Questions
What is the difference between GB/T 1591 Q355MF and GB/T 1591 Q355MB?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 1591 Q355MF be substituted with GB/T 1591 Q355MB?
GB/T 1591 Q355MF and GB/T 1591 Q355MB overlap closely enough on chemistry and mechanical properties that GB/T 1591 Q355MB is often considered as a substitute for GB/T 1591 Q355MF in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.