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BS 970 EN21 vs IS 4367 10Cr9Mo10

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

BS 970 EN21 (BS 970:1955) and IS 4367 10Cr9Mo10 (IS 4367:1991) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN21 is defined under British Standards (BS), originating from United Kingdom, while IS 4367 10Cr9Mo10 is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, BS 970 EN21 vs IS 4367 10Cr9Mo10 is a 59.7% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With BS 970 EN21:
NF A35-565 100C6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Mo6H IS 11169 (Part 1) 10Ni5Cr4
Match Breakdown
CHEMISTRY MATCH
59.7%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property BS 970 EN21 IS 4367 10Cr9Mo10
Standard BS 970:1955 IS 4367:1991
Category Alloy Steel Alloy Steel
C (%) 0.25-0.35 <=0.15
Si (%) 0.10-0.35 <=0.50
Mn (%) 0.35-0.75 0.40-0.70
Ni (%) 2.75-3.25 <=0.30
Cr (%) <=0.30 2.00-2.50
S (%) <=0.050 <=0.035
P (%) <=0.050 <=0.035
Mo (%) Not specified 0.90-1.10
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property BS 970 EN21 IS 4367 10Cr9Mo10
Tensile Strength ≥695 MPa (45 tons/sq in, converted) 410-590 MPa
Yield Strength ≥494 MPa (32 tons/sq in, converted) 245 MPa min
Elongation ≥22% >=18%
Hardness 201-255 HB Not specified
Condition Hardened and tempered R, ruling section 4 in (lowest-strength condition of the standard) Normalised and tempered, ruling section up to 50 mm
Izod Impact Not specified 55 J min
Hardness (soft annealed) Not specified <=187 HB
Typical Applications
BS 970 EN21
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. Suitable for 45/55 (R) and 50/60 (S) tons/sq in according to ruling section.
IS 4367 10Cr9Mo10
Not documented
Key Differences
Can BS 970 EN21 Be Substituted With IS 4367 10Cr9Mo10?
BS 970 EN21 and IS 4367 10Cr9Mo10 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.
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BS 970 EN21
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IS 4367 10Cr9Mo10
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Frequently Asked Questions
What is the difference between BS 970 EN21 and IS 4367 10Cr9Mo10?
IS 4367 10Cr9Mo10 specifies Mo which is not specified for BS 970 EN21.
Can BS 970 EN21 be substituted with IS 4367 10Cr9Mo10?
BS 970 EN21 and IS 4367 10Cr9Mo10 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.