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IS 1570 (Part 4) 21Cr4Mo2 vs IS 11169 (Part 1) 40Cr4Mo3

Close Alternative — 80.7% match based on chemical composition and mechanical property overlap.

IS 1570 (Part 4) 21Cr4Mo2 (IS 1570 (Part 4):1988) and IS 11169 (Part 1) 40Cr4Mo3 (IS 11169 (Part 1):2022) are both steel grades. Both fall under the Alloy Steel category. IS 1570 (Part 4) 21Cr4Mo2 is defined under Bureau of Indian Standards (IS), originating from India, while IS 11169 (Part 1) 40Cr4Mo3 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, IS 1570 (Part 4) 21Cr4Mo2 vs IS 11169 (Part 1) 40Cr4Mo3 is a 80.7% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a close alternative overall at 80.7%.

Frequently Compared With IS 1570 (Part 4) 21Cr4Mo2:
IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 7) 12Cr4Mo5H IS 1570 (Part 7) 10Mo6H IS 1570 (Part 7) 12Cr2Mo5V2H IS 11169 (Part 1) 12Cr4Mo2 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 12Cr9Mo10H GOST 4543 12HN3A IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 10Mo6
Match Breakdown
CHEMISTRY MATCH
80.7%
MECHANICAL MATCH
No shared data
OVERALL
80.7%
Specifications
Property IS 1570 (Part 4) 21Cr4Mo2 IS 11169 (Part 1) 40Cr4Mo3
Standard IS 1570 (Part 4):1988 IS 11169 (Part 1):2022
Category Alloy Steel Alloy Steel
C (%) <=0.26 0.35-0.45
Si (%) 0.10-0.35 0.10-0.35
Mn (%) 0.60-0.90 0.50-0.80
Cr (%) 0.90-1.20 0.90-1.20
Mo (%) 0.15-0.30 0.20-0.35
Cu (%) Not specified <=0.15
P (%) Not specified <=0.035
S (%) Not specified <=0.035
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property IS 1570 (Part 4) 21Cr4Mo2 IS 11169 (Part 1) 40Cr4Mo3
Tensile Strength 790-990 MPa Not specified
Yield Strength >=610 MPa Not specified
Condition Sheet and strip, hardened and tempered or cold rolled and tempered Not specified
Core Hardness (CH) Not specified >=48 HRC up to 28 mm
Hardness, annealed (+AC) Not specified <=200 HBW
Typical Applications
IS 1570 (Part 4) 21Cr4Mo2
Not documented
IS 11169 (Part 1) 40Cr4Mo3
Cold heading and cold extrusion of parts that are quenched and tempered; the standard covers bars, wire rods and wires of 2 to 100 mm (clause 1.1, Annex C)
Key Differences
Can IS 1570 (Part 4) 21Cr4Mo2 Be Substituted With IS 11169 (Part 1) 40Cr4Mo3?
IS 1570 (Part 4) 21Cr4Mo2 and IS 11169 (Part 1) 40Cr4Mo3 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
On M-EX Right Now
IS 1570 (Part 4) 21Cr4Mo2
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IS 11169 (Part 1) 40Cr4Mo3
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Frequently Asked Questions
What is the difference between IS 1570 (Part 4) 21Cr4Mo2 and IS 11169 (Part 1) 40Cr4Mo3?
IS 11169 (Part 1) 40Cr4Mo3 specifies Cu, P, S which are not specified for IS 1570 (Part 4) 21Cr4Mo2.
Can IS 1570 (Part 4) 21Cr4Mo2 be substituted with IS 11169 (Part 1) 40Cr4Mo3?
IS 1570 (Part 4) 21Cr4Mo2 and IS 11169 (Part 1) 40Cr4Mo3 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.