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GB/T 1591 Q355B vs GB/T 1591 Q355D

Strong Match — 96.5% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q355B (GB/T 1591:2018) and GB/T 1591 Q355D (GB/T 1591:2018) are both steel grades. Both fall under the Structural Steel category. GB/T 1591 Q355B is typically used for general structure for engineering (plates, strips, bars and sections), while GB/T 1591 Q355D is commonly used for general structure for engineering (plates, strips, bars and sections). GB/T 1591 Q355B is defined under Guobiao Standards (GB/T), originating from China, while GB/T 1591 Q355D is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 1591 Q355B vs GB/T 1591 Q355D is a 94.8% match. As per mechanical properties, the match is 100%. Combined, this makes them a strong match overall at 96.5%.

Frequently Compared With GB/T 1591 Q355B:
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
94.8%
MECHANICAL MATCH
100%
OVERALL
96.5%
Specifications
Property GB/T 1591 Q355B GB/T 1591 Q355D
Standard GB/T 1591:2018 GB/T 1591:2018
Category Structural Steel Structural Steel
C (%) <=0.24 <=0.20
Si (%) <=0.55 <=0.55
Mn (%) <=1.60 <=1.60
P (%) <=0.035 <=0.025
S (%) <=0.035 <=0.025
Cr (%) <=0.30 <=0.30
Ni (%) <=0.30 <=0.30
Cu (%) <=0.40 <=0.40
N (%) <=0.012 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 Q355B GB/T 1591 Q355D
Tensile Strength 470-630 MPa 470-630 MPa
Yield Strength >=355 MPa >=355 MPa
Elongation >=22% >=22%
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 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 Q355B
General structure for engineering (plates, strips, bars and sections)
GB/T 1591 Q355D
General structure for engineering (plates, strips, bars and sections)
Key Differences
Can GB/T 1591 Q355B Be Substituted With GB/T 1591 Q355D?
GB/T 1591 Q355B and GB/T 1591 Q355D overlap closely enough on chemistry and mechanical properties that GB/T 1591 Q355D is often considered as a substitute for GB/T 1591 Q355B 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 Q355B
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GB/T 1591 Q355D
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Frequently Asked Questions
What is the difference between GB/T 1591 Q355B and GB/T 1591 Q355D?
GB/T 1591 Q355B specifies N which is not specified for GB/T 1591 Q355D.
Can GB/T 1591 Q355B be substituted with GB/T 1591 Q355D?
GB/T 1591 Q355B and GB/T 1591 Q355D overlap closely enough on chemistry and mechanical properties that GB/T 1591 Q355D is often considered as a substitute for GB/T 1591 Q355B in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.