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IS 1570 (Part 4) 21Cr4Mo2 vs GOST 4543 12HN3A

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

IS 1570 (Part 4) 21Cr4Mo2 (IS 1570 (Part 4):1988) and GOST 4543 12HN3A (GOST 4543-2016) are both steel grades. Both fall under the Alloy Steel category. IS 1570 (Part 4) 21Cr4Mo2 is defined under Bureau of Indian Standards (IS) (India).

As per chemical composition, IS 1570 (Part 4) 21Cr4Mo2 vs GOST 4543 12HN3A is a 60.4% match. As per mechanical properties, the match is 26.9%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With IS 1570 (Part 4) 21Cr4Mo2:
IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 7) 12Cr4Mo5H IS 1570 (Part 7) 10Mo6H IS 11169 (Part 1) 12Cr4Mo2 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 7) 12Cr2Mo5V2H IS 1570 (Part 7) 12Cr9Mo10H NF A35-565 100C6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Mo6 UNI 11234 100Cr6
Match Breakdown
CHEMISTRY MATCH
60.4%
MECHANICAL MATCH
26.9%
OVERALL
35%
Specifications
Property IS 1570 (Part 4) 21Cr4Mo2 GOST 4543 12HN3A
Standard IS 1570 (Part 4):1988 GOST 4543-2016
Category Alloy Steel Alloy Steel
C (%) <=0.26 0.09-0.16
Si (%) 0.10-0.35 0.17-0.37
Mn (%) 0.60-0.90 0.3-0.6
Cr (%) 0.90-1.20 0.6-0.9
Mo (%) 0.15-0.30 Not specified
Ni (%) Not specified 2.75-3.15
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 GOST 4543 12HN3A
Tensile Strength 790-990 MPa 850-1050 MPa
Yield Strength >=610 MPa 685 MPa min
Condition Sheet and strip, hardened and tempered or cold rolled and tempered Not specified
Elongation Not specified 11% min
Hardness Not specified 58-62 HRC (case)
Typical Applications
IS 1570 (Part 4) 21Cr4Mo2
Not documented
GOST 4543 12HN3A
Used for gears, pinions, crankshafts, aircraft parts, and transmission components.
Key Differences
Can IS 1570 (Part 4) 21Cr4Mo2 Be Substituted With GOST 4543 12HN3A?
IS 1570 (Part 4) 21Cr4Mo2 and GOST 4543 12HN3A 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
IS 1570 (Part 4) 21Cr4Mo2
No active listings currently.
GOST 4543 12HN3A
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5600–6600 mm (220.47–259.84 in)
On M-EX Right Now
IS 1570 (Part 4) 21Cr4Mo2
0 active listings and RFQs →
GOST 4543 12HN3A
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between IS 1570 (Part 4) 21Cr4Mo2 and GOST 4543 12HN3A?
IS 1570 (Part 4) 21Cr4Mo2 specifies Mo which is not specified for GOST 4543 12HN3A. GOST 4543 12HN3A specifies Ni which is not specified for IS 1570 (Part 4) 21Cr4Mo2.
Can IS 1570 (Part 4) 21Cr4Mo2 be substituted with GOST 4543 12HN3A?
IS 1570 (Part 4) 21Cr4Mo2 and GOST 4543 12HN3A 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.