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GOST 380 St3ps vs GB/T 1591 Q355B

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

GOST 380 St3ps (GOST 380-2005) and GB/T 1591 Q355B (GB/T 1591:2018) are both steel grades. Both fall under the Structural Steel category. GOST 380 St3ps is typically used for structural steelwork, welded assemblies, construction materials, plates, bars, channels, while GB/T 1591 Q355B is commonly used for general structure for engineering (plates, strips, bars and sections). GB/T 1591 Q355B is defined under Guobiao Standards (GB/T) (China).

As per chemical composition, GOST 380 St3ps vs GB/T 1591 Q355B 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 GOST 380 St3ps:
ASTM A283C CSA G40.21 300W AS/NZS 3679.1 300 AS/NZS 3679.1 350 ASTM A572 Gr.65 CSA G40.21 400W CSA G40.21 350W ASTM A1008 SS Grade 80 CSA G40.21 260W CSA G40.21 480W GOST 19281 09G2S CSA G40.21 400A
Match Breakdown
CHEMISTRY MATCH
80.7%
MECHANICAL MATCH
35.9%
OVERALL
65.8%
Specifications
Property GOST 380 St3ps GB/T 1591 Q355B
Standard GOST 380-2005 GB/T 1591:2018
Category Structural Steel Structural Steel
C (%) 0.14-0.22 <=0.24
Si (%) 0.05-0.15 <=0.55
Mn (%) 0.40-0.65 <=1.60
S (%) <=0.050 <=0.035
P (%) <=0.040 <=0.035
Cu (%) <=0.30 <=0.40
Ni (%) <=0.30 <=0.30
Cr (%) <=0.30 <=0.30
N (%) Not specified <=0.012
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property GOST 380 St3ps GB/T 1591 Q355B
Tensile Strength 370-490 MPa 470-630 MPa
Yield Strength >=235 MPa >=355 MPa
Elongation >=22% >=22%
Hardness <=170 HB Not specified
Condition Not specified 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
GOST 380 St3ps
structural steelwork, welded assemblies, construction materials, plates, bars, channels
GB/T 1591 Q355B
General structure for engineering (plates, strips, bars and sections)
Key Differences
Can GOST 380 St3ps Be Substituted With GB/T 1591 Q355B?
GOST 380 St3ps and GB/T 1591 Q355B 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
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)
GB/T 1591 Q355B
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On M-EX Right Now
GOST 380 St3ps
2 active listings and RFQs →
GB/T 1591 Q355B
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Frequently Asked Questions
What is the difference between GOST 380 St3ps and GB/T 1591 Q355B?
GB/T 1591 Q355B specifies N which is not specified for GOST 380 St3ps.
Can GOST 380 St3ps be substituted with GB/T 1591 Q355B?
GOST 380 St3ps and GB/T 1591 Q355B 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.