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GOST 380 St3sp vs CSA G40.21 400A

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

GOST 380 St3sp (GOST 380-2005) and CSA G40.21 400A (CSA G40.21-13 (R2023)) 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 CSA G40.21 400A is commonly used for atmospheric corrosion-resistant (weathering) structural steel; exposed bridge girders and structural members where high strength and weathering resistance are both needed. CSA G40.21 400A is defined under Canadian Standards Association (CSA) (Canada).

As per chemical composition, GOST 380 St3sp vs CSA G40.21 400A is a 68.4% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With GOST 380 St3sp:
AS/NZS 3679.1 300 CSA G40.21 260W AS/NZS 3679.1 350 CSA G40.21 350W CSA G40.21 400W ASTM A1008 SS Grade 50 ASTM A1008 SS Grade 80 GOST 19281 09G2S CSA G40.21 300W ASTM A283C ASTM A572 Gr.65 CSA G40.21 480W
Match Breakdown
CHEMISTRY MATCH
68.4%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property GOST 380 St3sp CSA G40.21 400A
Standard GOST 380-2005 CSA G40.21-13 (R2023)
Category Structural Steel Structural Steel
C (%) 0.14-0.22 <=0.23
Si (%) 0.15-0.30 <=0.40
Mn (%) 0.40-0.65 <=1.60
S (%) <=0.050 <=0.035
P (%) <=0.040 <=0.035
Cu (%) <=0.30 0.20-0.40
Ni (%) <=0.30 Not specified
Cr (%) <=0.30 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 GOST 380 St3sp CSA G40.21 400A
Tensile Strength 370-490 MPa 520-670 MPa
Yield Strength >=245 MPa 400 MPa min
Elongation >=22% 17% min
Hardness <=170 HB Not specified
Impact Not specified 27J at 0°C
Typical Applications
GOST 380 St3sp
structural components, welded structures, plates, construction equipment, machinery frames, rolled sections
CSA G40.21 400A
Atmospheric corrosion-resistant (weathering) structural steel; exposed bridge girders and structural members where high strength and weathering resistance are both needed
Key Differences
Can GOST 380 St3sp Be Substituted With CSA G40.21 400A?
GOST 380 St3sp and CSA G40.21 400A 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)
CSA G40.21 400A
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2800–4200 mm (110.24–165.35 in)
On M-EX Right Now
GOST 380 St3sp
2 active listings and RFQs →
CSA G40.21 400A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GOST 380 St3sp and CSA G40.21 400A?
GOST 380 St3sp specifies Ni, Cr which are not specified for CSA G40.21 400A.
Can GOST 380 St3sp be substituted with CSA G40.21 400A?
GOST 380 St3sp and CSA G40.21 400A 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.