Post Stock Login Register

GOST 380 St3sp vs GB/T 1591 Q355C

Related Material — 65.3% match based on chemical composition and mechanical property overlap.

GOST 380 St3sp (GOST 380-2005) and GB/T 1591 Q355C (GB/T 1591:2018) are both steel grades. Both fall under the Structural Steel category. GOST 380 St3sp is typically used for structural components, welded structures, plates, construction equipment, machinery frames, rolled sections, while GB/T 1591 Q355C is commonly used for general structure for engineering (plates, strips, bars and sections). GB/T 1591 Q355C is defined under Guobiao Standards (GB/T) (China).

As per chemical composition, GOST 380 St3sp vs GB/T 1591 Q355C is a 80% match. As per mechanical properties, the match is 35.9%. Combined, this makes them a related material overall at 65.3%.

Frequently Compared With GOST 380 St3sp:
AS/NZS 3679.1 300 CSA G40.21 260W AS/NZS 3679.1 350 CSA G40.21 400W CSA G40.21 350W CSA G40.21 400A ASTM A1008 SS Grade 50 ASTM A1008 SS Grade 80 GOST 19281 09G2S CSA G40.21 300W ASTM A283C ASTM A572 Gr.65
Match Breakdown
CHEMISTRY MATCH
80%
MECHANICAL MATCH
35.9%
OVERALL
65.3%
Specifications
Property GOST 380 St3sp GB/T 1591 Q355C
Standard GOST 380-2005 GB/T 1591:2018
Category Structural Steel Structural Steel
C (%) 0.14-0.22 <=0.20
Si (%) 0.15-0.30 <=0.55
Mn (%) 0.40-0.65 <=1.60
S (%) <=0.050 <=0.030
P (%) <=0.040 <=0.030
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 St3sp GB/T 1591 Q355C
Tensile Strength 370-490 MPa 470-630 MPa
Yield Strength >=245 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 St3sp
structural components, welded structures, plates, construction equipment, machinery frames, rolled sections
GB/T 1591 Q355C
General structure for engineering (plates, strips, bars and sections)
Key Differences
Can GOST 380 St3sp Be Substituted With GB/T 1591 Q355C?
GOST 380 St3sp and GB/T 1591 Q355C 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 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)
GB/T 1591 Q355C
No active listings currently.
On M-EX Right Now
GOST 380 St3sp
2 active listings and RFQs →
GB/T 1591 Q355C
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between GOST 380 St3sp and GB/T 1591 Q355C?
GB/T 1591 Q355C specifies N which is not specified for GOST 380 St3sp.
Can GOST 380 St3sp be substituted with GB/T 1591 Q355C?
GOST 380 St3sp and GB/T 1591 Q355C 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.