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GB/T 1591 Q355B vs GOST 380 St3ps

Related Material — 65.8% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q355B (GB/T 1591:2018) and GOST 380 St3ps (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 St3ps is commonly used for structural steelwork, welded assemblies, construction materials, plates, bars, channels. GB/T 1591 Q355B is defined under Guobiao Standards (GB/T) (China).

As per chemical composition, GB/T 1591 Q355B vs GOST 380 St3ps is a 80.7% match. As per mechanical properties, the match is 35.9%. Combined, this makes them a related material overall at 65.8%.

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
80.7%
MECHANICAL MATCH
35.9%
OVERALL
65.8%
Specifications
Property GB/T 1591 Q355B GOST 380 St3ps
Standard GB/T 1591:2018 GOST 380-2005
Category Structural Steel Structural Steel
C (%) <=0.24 0.14-0.22
Si (%) <=0.55 0.05-0.15
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 St3ps
Tensile Strength 470-630 MPa 370-490 MPa
Yield Strength >=355 MPa >=235 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 St3ps
structural steelwork, welded assemblies, construction materials, plates, bars, channels
Key Differences
Can GB/T 1591 Q355B Be Substituted With GOST 380 St3ps?
GB/T 1591 Q355B and GOST 380 St3ps 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 St3ps
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 3200–4400 mm (125.98–173.23 in)
On M-EX Right Now
GB/T 1591 Q355B
0 active listings and RFQs →
GOST 380 St3ps
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q355B and GOST 380 St3ps?
GB/T 1591 Q355B specifies N which is not specified for GOST 380 St3ps.
Can GB/T 1591 Q355B be substituted with GOST 380 St3ps?
GB/T 1591 Q355B and GOST 380 St3ps 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.