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IS 4432 21Cr4Mo2 vs BS 970 (Part 3) 709M40

Close Alternative — 80.8% match based on chemical composition and mechanical property overlap.

IS 4432 21Cr4Mo2 (IS 4432:1988) and BS 970 (Part 3) 709M40 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Alloy Steel category. IS 4432 21Cr4Mo2 is typically used for forgings and fabrication of case-hardened machine or automobile parts, while BS 970 (Part 3) 709M40 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy direct hardening steel (table 16). IS 4432 21Cr4Mo2 is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 (Part 3) 709M40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, IS 4432 21Cr4Mo2 vs BS 970 (Part 3) 709M40 is a 80.8% 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 80.8%.

Frequently Compared With IS 4432 21Cr4Mo2:
NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 07Cr4Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 12Cr2Mo5V2H IS 4367 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Mo6H
Match Breakdown
CHEMISTRY MATCH
80.8%
MECHANICAL MATCH
No shared data
OVERALL
80.8%
Specifications
Property IS 4432 21Cr4Mo2 BS 970 (Part 3) 709M40
Standard IS 4432:1988 BS 970 (Part 3):1991
Category Alloy Steel Alloy Steel
C (%) <=0.26 0.36-0.44
Si (%) 0.10-0.35 0.10-0.40
Mn (%) 0.60-0.90 0.70-1.00
Cr (%) 0.90-1.20 0.90-1.20
Mo (%) 0.15-0.30 0.25-0.35
S (%) <=0.035 <=0.040
P (%) <=0.035 <=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 4432 21Cr4Mo2 BS 970 (Part 3) 709M40
Core Tensile Strength 1100-1400 MPa (16 mm) / 1000-1350 MPa (30 mm) / 950-1250 MPa (63 mm) Not specified
Core Yield Strength >=750 MPa (16 mm) / >=700 MPa (30 mm) / >=650 MPa (63 mm) Not specified
Core Elongation >=8% (16 mm) / >=9% (30 mm) / >=10% (63 mm) Not specified
Core Reduction of Area >=35% (16 mm) / >=40% (30 mm) / >=40% (63 mm) Not specified
Hardness, annealed (A) <=217 HB Not specified
Typical Applications
IS 4432 21Cr4Mo2
Forgings and fabrication of case-hardened machine or automobile parts
BS 970 (Part 3) 709M40
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy direct hardening steel (Table 16)
Can IS 4432 21Cr4Mo2 Be Substituted With BS 970 (Part 3) 709M40?
IS 4432 21Cr4Mo2 and BS 970 (Part 3) 709M40 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.
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IS 4432 21Cr4Mo2
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BS 970 (Part 3) 709M40
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Frequently Asked Questions
What is the difference between IS 4432 21Cr4Mo2 and BS 970 (Part 3) 709M40?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can IS 4432 21Cr4Mo2 be substituted with BS 970 (Part 3) 709M40?
IS 4432 21Cr4Mo2 and BS 970 (Part 3) 709M40 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.