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ASTM A681 O2 vs IS 4432 21Cr4Mo2

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

ASTM A681 O2 (ASTM A681:2008) and IS 4432 21Cr4Mo2 (IS 4432:1988) are both steel grades. ASTM A681 O2 is classified under Tool & Die Steels, while IS 4432 21Cr4Mo2 is classified under Alloy Steel — a different category, which is worth noting alongside the chemistry match below. ASTM A681 O2 is typically used for taps, drills, reamers, punches, gauges, while IS 4432 21Cr4Mo2 is commonly used for forgings and fabrication of case-hardened machine or automobile parts. ASTM A681 O2 is defined under ASTM International, originating from United States, while IS 4432 21Cr4Mo2 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, ASTM A681 O2 vs IS 4432 21Cr4Mo2 is a 66.3% match. As per mechanical properties, the match is 100%. Combined, this makes them a related material overall at 65%.

Frequently Compared With ASTM A681 O2:
GOST 5950 4H5MFS EN ISO 683-17 100Cr6 GB/T 1299 3Cr2W8V GOST 5950 3H2W8F GB/T 1299 4Cr5MoSiV EN ISO 4957 1.2316 DIN EN ISO 4957 1.2344 GOST 5950 4H5MFS1 DIN EN ISO 4957 1.2379 GB/T 1299 4Cr5MoSiV1 AISI 52100 IS 1570 (Part 6) 50T8
Match Breakdown
CHEMISTRY MATCH
66.3%
MECHANICAL MATCH
100%
OVERALL
65%
Specifications
Property ASTM A681 O2 IS 4432 21Cr4Mo2
Standard ASTM A681:2008 IS 4432:1988
Category Tool & Die Steels Alloy Steel
C (%) 0.85-0.95 <=0.26
Mn (%) 1.40-1.80 0.60-0.90
P (%) <=0.030 <=0.035
S (%) <=0.030 <=0.035
Si (%) <=0.50 0.10-0.35
Cr (%) <=0.50 0.90-1.20
V (%) <=0.30 Not specified
Mo (%) <=0.30 0.15-0.30
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property ASTM A681 O2 IS 4432 21Cr4Mo2
Hardness <=217 HB Not specified
Condition Annealed (maximum Brinell hardness) Not specified
Core Tensile Strength Not specified 1100-1400 MPa (16 mm) / 1000-1350 MPa (30 mm) / 950-1250 MPa (63 mm)
Core Yield Strength Not specified >=750 MPa (16 mm) / >=700 MPa (30 mm) / >=650 MPa (63 mm)
Core Elongation Not specified >=8% (16 mm) / >=9% (30 mm) / >=10% (63 mm)
Core Reduction of Area Not specified >=35% (16 mm) / >=40% (30 mm) / >=40% (63 mm)
Hardness, annealed (A) Not specified <=217 HB
Typical Applications
ASTM A681 O2
Taps, drills, reamers, punches, gauges
IS 4432 21Cr4Mo2
Forgings and fabrication of case-hardened machine or automobile parts
Key Differences
Can ASTM A681 O2 Be Substituted With IS 4432 21Cr4Mo2?
ASTM A681 O2 and IS 4432 21Cr4Mo2 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
ASTM A681 O2
Round Bar → (6 listings)
Diameter: 40–60 mm (1.57–2.36 in)
Length: 600–5700 mm (23.62–224.41 in)
IS 4432 21Cr4Mo2
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On M-EX Right Now
ASTM A681 O2
6 active listings and RFQs →
IS 4432 21Cr4Mo2
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Frequently Asked Questions
What is the difference between ASTM A681 O2 and IS 4432 21Cr4Mo2?
Different category: ASTM A681 O2 is Tool & Die Steels, IS 4432 21Cr4Mo2 is Alloy Steel. ASTM A681 O2 specifies V which is not specified for IS 4432 21Cr4Mo2.
Can ASTM A681 O2 be substituted with IS 4432 21Cr4Mo2?
ASTM A681 O2 and IS 4432 21Cr4Mo2 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.