Minimal Match — 53.4% match
based on chemical composition and mechanical property overlap.
IS 1875 Class 4 (IS 1875:1992) and BS 970 (Part 1) 055M15 (BS 970 (Part 1):1991) are both steel grades.
Both fall under the Carbon Steel category.
IS 1875 Class 4 is typically used for billets, blooms, slabs and bars for general engineering forgings, while BS 970 (Part 1) 055M15 is commonly used for as-rolled, or as-rolled and softened, steel (section two).
IS 1875 Class 4 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 1875 Class 4 vs BS 970 (Part 1) 055M15 is a 80.1% match.
As per mechanical properties, the match is 0%.
Combined, this makes them a minimal match overall at 53.4%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
IS 1875 Class 4
BS 970 (Part 1) 055M15
Tensile Strength
620 MPa min
310 MPa min
Yield Strength
320 MPa min
Not specified
Elongation
>=15%
25 % min
Hardness
175 HB min
121 HB min
Condition
as rolled or as forged and normalised, ruling section up to 100 mm
As-rolled
Normalising Temperature
830-860 °C (for information)
Not specified
Bend Test (if ordered)
32 mm square test piece bent round a 64 mm former without fracture
Not specified
Typical Applications
IS 1875 Class 4
Billets, blooms, slabs and bars for general engineering forgings
BS 970 (Part 1) 055M15
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
IS 1875 Class 4 specifies Si, S, P which are not specified for BS 970 (Part 1) 055M15.
Can IS 1875 Class 4 Be Substituted With BS 970 (Part 1) 055M15?
IS 1875 Class 4 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.
What is the difference between IS 1875 Class 4 and BS 970 (Part 1) 055M15?
IS 1875 Class 4 specifies Si, S, P which are not specified for BS 970 (Part 1) 055M15.
Can IS 1875 Class 4 be substituted with BS 970 (Part 1) 055M15?
IS 1875 Class 4 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.