IS 1570 (Part 7) 40CrMoH vs BS 970 (Part 3) 708M40
Close Alternative — 77% match
based on chemical composition and mechanical property overlap.
IS 1570 (Part 7) 40CrMoH (IS 1570 (Part 7):1992) and BS 970 (Part 3) 708M40 (BS 970 (Part 3):1991) are both steel grades.
Both fall under the Alloy Steel category.
IS 1570 (Part 7) 40CrMoH is typically used for boilers, pressure vessels, steam turbines, steam and water piping and other power plant equipment working at elevated temperature, while BS 970 (Part 3) 708M40 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy direct hardening steel (table 16).
IS 1570 (Part 7) 40CrMoH is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 (Part 3) 708M40 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, IS 1570 (Part 7) 40CrMoH vs BS 970 (Part 3) 708M40 is a 77% 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 77%.
Frequently Compared With IS 1570 (Part 7) 40CrMoH:
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 7) 40CrMoH
BS 970 (Part 3) 708M40
Tensile Strength
850-1000 MPa
Not specified
Yield Strength
>=635 MPa (0.2 % proof stress)
Not specified
Elongation
>=14%
Not specified
Condition
Bars, forgings, Q+T, thickness up to 200 (first row of Table 3)
Not specified
Typical Applications
IS 1570 (Part 7) 40CrMoH
Boilers, pressure vessels, steam turbines, steam and water piping and other power plant equipment working at elevated temperature
BS 970 (Part 3) 708M40
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy direct hardening steel (Table 16)
Can IS 1570 (Part 7) 40CrMoH Be Substituted With BS 970 (Part 3) 708M40?
IS 1570 (Part 7) 40CrMoH and BS 970 (Part 3) 708M40 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 1570 (Part 7) 40CrMoH and BS 970 (Part 3) 708M40?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can IS 1570 (Part 7) 40CrMoH be substituted with BS 970 (Part 3) 708M40?
IS 1570 (Part 7) 40CrMoH and BS 970 (Part 3) 708M40 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.