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GOST 380 St3sp vs IS 1570 (Part 4) 15Cr6Ni6

Related Material — 65% match based on chemical composition and mechanical property overlap.

GOST 380 St3sp (GOST 380-2005) and IS 1570 (Part 4) 15Cr6Ni6 (IS 1570 (Part 4):1988) are both steel grades. GOST 380 St3sp is classified under Structural Steel, while IS 1570 (Part 4) 15Cr6Ni6 is classified under Alloy Steel — a different category, which is worth noting alongside the chemistry match below. IS 1570 (Part 4) 15Cr6Ni6 is defined under Bureau of Indian Standards (IS) (India).

As per chemical composition, GOST 380 St3sp vs IS 1570 (Part 4) 15Cr6Ni6 is a 72.2% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 65%.

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
72.2%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property GOST 380 St3sp IS 1570 (Part 4) 15Cr6Ni6
Standard GOST 380-2005 IS 1570 (Part 4):1988
Category Structural Steel Alloy Steel
C (%) 0.14-0.22 0.12-0.18
Si (%) 0.15-0.30 0.15-0.35
Mn (%) 0.40-0.65 0.40-0.60
S (%) <=0.050 Not specified
P (%) <=0.040 Not specified
Cu (%) <=0.30 Not specified
Ni (%) <=0.30 1.40-1.70
Cr (%) <=0.30 1.40-1.70
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 IS 1570 (Part 4) 15Cr6Ni6
Tensile Strength 370-490 MPa Not specified
Yield Strength >=245 MPa Not specified
Elongation >=22% Not specified
Hardness <=170 HB Not specified
Typical Applications
GOST 380 St3sp
structural components, welded structures, plates, construction equipment, machinery frames, rolled sections
IS 1570 (Part 4) 15Cr6Ni6
Not documented
Key Differences
Can GOST 380 St3sp Be Substituted With IS 1570 (Part 4) 15Cr6Ni6?
GOST 380 St3sp and IS 1570 (Part 4) 15Cr6Ni6 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)
IS 1570 (Part 4) 15Cr6Ni6
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On M-EX Right Now
GOST 380 St3sp
2 active listings and RFQs →
IS 1570 (Part 4) 15Cr6Ni6
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Frequently Asked Questions
What is the difference between GOST 380 St3sp and IS 1570 (Part 4) 15Cr6Ni6?
Different category: GOST 380 St3sp is Structural Steel, IS 1570 (Part 4) 15Cr6Ni6 is Alloy Steel. GOST 380 St3sp specifies S, P, Cu which are not specified for IS 1570 (Part 4) 15Cr6Ni6.
Can GOST 380 St3sp be substituted with IS 1570 (Part 4) 15Cr6Ni6?
GOST 380 St3sp and IS 1570 (Part 4) 15Cr6Ni6 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.