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GOST 380 St3sp vs IS 11169 (Part 1) 20Mn5Cr5

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

GOST 380 St3sp (GOST 380-2005) and IS 11169 (Part 1) 20Mn5Cr5 (IS 11169 (Part 1):2022) are both steel grades. GOST 380 St3sp is classified under Structural Steel, while IS 11169 (Part 1) 20Mn5Cr5 is classified under Alloy Steel — a different category, which is worth noting alongside the chemistry match below. GOST 380 St3sp is typically used for structural components, welded structures, plates, construction equipment, machinery frames, rolled sections, while IS 11169 (Part 1) 20Mn5Cr5 is commonly used for cold heading and cold extrusion of parts that are case hardened; the standard covers bars, wire rods and wires of 2 to 100 mm (clause 1.1, annex b). IS 11169 (Part 1) 20Mn5Cr5 is defined under Bureau of Indian Standards (IS) (India).

As per chemical composition, GOST 380 St3sp vs IS 11169 (Part 1) 20Mn5Cr5 is a 73.3% match. As per mechanical properties, the match is 100%. 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
73.3%
MECHANICAL MATCH
100%
OVERALL
65%
Specifications
Property GOST 380 St3sp IS 11169 (Part 1) 20Mn5Cr5
Standard GOST 380-2005 IS 11169 (Part 1):2022
Category Structural Steel Alloy Steel
C (%) 0.14-0.22 0.17-0.22
Si (%) 0.15-0.30 0.10-0.35
Mn (%) 0.40-0.65 1.00-1.40
S (%) <=0.050 <=0.035
P (%) <=0.040 <=0.035
Cu (%) <=0.30 <=0.15
Ni (%) <=0.30 <=0.15
Cr (%) <=0.30 1.00-1.30
Mo (%) Not specified <=0.05
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 11169 (Part 1) 20Mn5Cr5
Tensile Strength 370-490 MPa Not specified
Yield Strength >=245 MPa Not specified
Elongation >=22% Not specified
Hardness <=170 HB Not specified
Hardness, annealed (+AC) Not specified <=170 HBW
Typical Applications
GOST 380 St3sp
structural components, welded structures, plates, construction equipment, machinery frames, rolled sections
IS 11169 (Part 1) 20Mn5Cr5
Cold heading and cold extrusion of parts that are case hardened; the standard covers bars, wire rods and wires of 2 to 100 mm (clause 1.1, Annex B)
Key Differences
Can GOST 380 St3sp Be Substituted With IS 11169 (Part 1) 20Mn5Cr5?
GOST 380 St3sp and IS 11169 (Part 1) 20Mn5Cr5 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 11169 (Part 1) 20Mn5Cr5
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On M-EX Right Now
GOST 380 St3sp
2 active listings and RFQs →
IS 11169 (Part 1) 20Mn5Cr5
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Frequently Asked Questions
What is the difference between GOST 380 St3sp and IS 11169 (Part 1) 20Mn5Cr5?
Different category: GOST 380 St3sp is Structural Steel, IS 11169 (Part 1) 20Mn5Cr5 is Alloy Steel. IS 11169 (Part 1) 20Mn5Cr5 specifies Mo which is not specified for GOST 380 St3sp.
Can GOST 380 St3sp be substituted with IS 11169 (Part 1) 20Mn5Cr5?
GOST 380 St3sp and IS 11169 (Part 1) 20Mn5Cr5 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.