Close Alternative — 78.9% match
based on chemical composition and mechanical property overlap.
IS 1875 Class 1A (IS 1875:1992) and BS 970 (Part 1) 040A04 (BS 970 (Part 1):1991) are both steel grades.
Both fall under the Carbon Steel category.
IS 1875 Class 1A is typically used for billets, blooms, slabs and bars for general engineering forgings, while BS 970 (Part 1) 040A04 is commonly used for as-rolled, or as-rolled and softened, steel (section two).
IS 1875 Class 1A 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 1875 Class 1A vs BS 970 (Part 1) 040A04 is a 78.9% match.
Mechanical property data is not available for both grades, so this factor could not be scored.
Combined, this makes them a close alternative overall at 78.9%.
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 1A
BS 970 (Part 1) 040A04
Tensile Strength
410 MPa min
Not specified
Yield Strength
220 MPa min
Not specified
Elongation
>=25%
Not specified
Hardness
110 HB min
Not specified
Condition
as rolled or as forged and normalised, ruling section up to 100 mm
Not specified
Normalising Temperature
880-910 °C (for information)
Not specified
Bend Test (if ordered)
32 mm square test piece bent round a 38 mm former without fracture
Not specified
Typical Applications
IS 1875 Class 1A
Billets, blooms, slabs and bars for general engineering forgings
BS 970 (Part 1) 040A04
As-rolled, or as-rolled and softened, steel (section two)
Key Differences
IS 1875 Class 1A specifies Si, S, P which are not specified for BS 970 (Part 1) 040A04.
Can IS 1875 Class 1A Be Substituted With BS 970 (Part 1) 040A04?
IS 1875 Class 1A and BS 970 (Part 1) 040A04 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
What is the difference between IS 1875 Class 1A and BS 970 (Part 1) 040A04?
IS 1875 Class 1A specifies Si, S, P which are not specified for BS 970 (Part 1) 040A04.
Can IS 1875 Class 1A be substituted with BS 970 (Part 1) 040A04?
IS 1875 Class 1A and BS 970 (Part 1) 040A04 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.