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IS 1570 (Part 4) 20C15 vs BS 970 (Part 1) 040A04

Related Material — 69.9% match based on chemical composition and mechanical property overlap.

IS 1570 (Part 4) 20C15 (IS 1570 (Part 4):1988) and BS 970 (Part 1) 040A04 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Carbon Steel category. IS 1570 (Part 4) 20C15 is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 (Part 1) 040A04 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, IS 1570 (Part 4) 20C15 vs BS 970 (Part 1) 040A04 is a 80% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 69.9%.

Frequently Compared With IS 1570 (Part 4) 20C15:
BS 970 (Part 1) 080A20 BS 970 (Part 3) 070M55 BS 970 (Part 1) 040A10 BS 970 (Part 1) 045A10 BS 970 (Part 3) 070M20 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 040A12 BS 970 (Part 3) 045A10 BS 970 (Part 1) 055M15
Match Breakdown
CHEMISTRY MATCH
80%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property IS 1570 (Part 4) 20C15 BS 970 (Part 1) 040A04
Standard IS 1570 (Part 4):1988 BS 970 (Part 1):1991
Category Carbon Steel Carbon Steel
C (%) 0.16-0.24 <=0.08
Si (%) 0.10-0.35 Not specified
Mn (%) 1.30-1.70 0.30-0.50
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) 20C15 BS 970 (Part 1) 040A04
Tensile Strength 690-840 MPa Not specified
Yield Strength >=450 MPa (0.2 % proof stress) Not specified
Elongation >=16% Not specified
Izod Impact >=48 J Not specified
Hardness 201-248 HBS (guidance only) Not specified
Condition Bars and forgings, hardened and tempered (oil hardened unless stated), limiting ruling section 30 mm Not specified
Typical Applications
IS 1570 (Part 4) 20C15
Not documented
BS 970 (Part 1) 040A04
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
Can IS 1570 (Part 4) 20C15 Be Substituted With BS 970 (Part 1) 040A04?
IS 1570 (Part 4) 20C15 and BS 970 (Part 1) 040A04 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) 20C15
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BS 970 (Part 1) 040A04
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Frequently Asked Questions
What is the difference between IS 1570 (Part 4) 20C15 and BS 970 (Part 1) 040A04?
IS 1570 (Part 4) 20C15 specifies Si which is not specified for BS 970 (Part 1) 040A04.
Can IS 1570 (Part 4) 20C15 be substituted with BS 970 (Part 1) 040A04?
IS 1570 (Part 4) 20C15 and BS 970 (Part 1) 040A04 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.