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IS 1570 (Part 4) 27C15 vs BS 970 (Part 1) 055M15

Minimal Match — 53.3% match based on chemical composition and mechanical property overlap.

IS 1570 (Part 4) 27C15 (IS 1570 (Part 4):1988) and BS 970 (Part 1) 055M15 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Carbon Steel category. IS 1570 (Part 4) 27C15 is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 (Part 1) 055M15 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, IS 1570 (Part 4) 27C15 vs BS 970 (Part 1) 055M15 is a 80% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 53.3%.

Frequently Compared With IS 1570 (Part 4) 27C15:
BS 970 (Part 1) 040A10 BS 970 (Part 3) 070M55 BS 970 (Part 1) 080A20 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A12 BS 970 (Part 1) 060A32 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10
Match Breakdown
CHEMISTRY MATCH
80%
MECHANICAL MATCH
0%
OVERALL
53.3%
Specifications
Property IS 1570 (Part 4) 27C15 BS 970 (Part 1) 055M15
Standard IS 1570 (Part 4):1988 BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) 0.22-0.32 <=0.20
Si (%) 0.10-0.35 Not specified
Mn (%) 1.30-1.70 <=0.80
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) 27C15 BS 970 (Part 1) 055M15
Tensile Strength 690-840 MPa 310 MPa min
Yield Strength >=450 MPa (0.2 % proof stress) Not specified
Elongation >=16% 25 % min
Izod Impact >=48 J Not specified
Hardness 201-248 HBS (guidance only) 121 HB min
Condition Bars and forgings, hardened and tempered (oil hardened unless stated), limiting ruling section 63 mm As-rolled
Typical Applications
IS 1570 (Part 4) 27C15
Not documented
BS 970 (Part 1) 055M15
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
Can IS 1570 (Part 4) 27C15 Be Substituted With BS 970 (Part 1) 055M15?
IS 1570 (Part 4) 27C15 and BS 970 (Part 1) 055M15 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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IS 1570 (Part 4) 27C15
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BS 970 (Part 1) 055M15
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Frequently Asked Questions
What is the difference between IS 1570 (Part 4) 27C15 and BS 970 (Part 1) 055M15?
IS 1570 (Part 4) 27C15 specifies Si which is not specified for BS 970 (Part 1) 055M15.
Can IS 1570 (Part 4) 27C15 be substituted with BS 970 (Part 1) 055M15?
IS 1570 (Part 4) 27C15 and BS 970 (Part 1) 055M15 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.