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GB/T 1591 Q355B vs GOST 380 St3sp

Related Material — 66.1% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q355B (GB/T 1591:2018) and GOST 380 St3sp (GOST 380-2005) 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 GOST 380 St3sp is commonly used for structural components, welded structures, plates, construction equipment, machinery frames, rolled sections. GB/T 1591 Q355B is defined under Guobiao Standards (GB/T) (China).

As per chemical composition, GB/T 1591 Q355B vs GOST 380 St3sp is a 81.2% match. As per mechanical properties, the match is 35.9%. Combined, this makes them a related material overall at 66.1%.

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
81.2%
MECHANICAL MATCH
35.9%
OVERALL
66.1%
Specifications
Property GB/T 1591 Q355B GOST 380 St3sp
Standard GB/T 1591:2018 GOST 380-2005
Category Structural Steel Structural Steel
C (%) <=0.24 0.14-0.22
Si (%) <=0.55 0.15-0.30
Mn (%) <=1.60 0.40-0.65
P (%) <=0.035 <=0.040
S (%) <=0.035 <=0.050
Cr (%) <=0.30 <=0.30
Ni (%) <=0.30 <=0.30
Cu (%) <=0.40 <=0.30
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 GOST 380 St3sp
Tensile Strength 470-630 MPa 370-490 MPa
Yield Strength >=355 MPa >=245 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 Not specified
Hardness Not specified <=170 HB
Typical Applications
GB/T 1591 Q355B
General structure for engineering (plates, strips, bars and sections)
GOST 380 St3sp
structural components, welded structures, plates, construction equipment, machinery frames, rolled sections
Key Differences
Can GB/T 1591 Q355B Be Substituted With GOST 380 St3sp?
GB/T 1591 Q355B and GOST 380 St3sp share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
Forms & Sizes Available on M-EX
GB/T 1591 Q355B
No active listings currently.
GOST 380 St3sp
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 3900–3900 mm (153.54–153.54 in)
On M-EX Right Now
GB/T 1591 Q355B
0 active listings and RFQs →
GOST 380 St3sp
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q355B and GOST 380 St3sp?
GB/T 1591 Q355B specifies N which is not specified for GOST 380 St3sp.
Can GB/T 1591 Q355B be substituted with GOST 380 St3sp?
GB/T 1591 Q355B and GOST 380 St3sp share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.