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IS 1570 (Part 7) 40CrMoH vs BS 970 (Part 1) 905M39

Close Alternative — 73.8% match based on chemical composition and mechanical property overlap.

IS 1570 (Part 7) 40CrMoH (IS 1570 (Part 7):1992) and BS 970 (Part 1) 905M39 (BS 970 (Part 1):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 1) 905M39 is commonly used for steel for surface hardening by nitriding (section three). IS 1570 (Part 7) 40CrMoH is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 (Part 1) 905M39 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, IS 1570 (Part 7) 40CrMoH vs BS 970 (Part 1) 905M39 is a 73.8% 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 73.8%.

Frequently Compared With IS 1570 (Part 7) 40CrMoH:
IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 7) 10Mo6H IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 12Cr2Mo5V2H GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 103Cr4 IS 1570 (Part 7) 12Cr4Mo5H
Match Breakdown
CHEMISTRY MATCH
73.8%
MECHANICAL MATCH
No shared data
OVERALL
73.8%
Specifications
Property IS 1570 (Part 7) 40CrMoH BS 970 (Part 1) 905M39
Standard IS 1570 (Part 7):1992 BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) 0.35-0.45 0.35-0.43
Si (%) 0.10-0.35 Not specified
Mn (%) 0.40-0.70 0.40-0.65
P (%) <=0.035 Not specified
S (%) <=0.035 Not specified
Cr (%) 1.00-1.50 1.40-1.80
Mo (%) 0.50-0.80 0.15-0.25
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 1) 905M39
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 1) 905M39
Steel for surface hardening by nitriding (section three)
Key Differences
Can IS 1570 (Part 7) 40CrMoH Be Substituted With BS 970 (Part 1) 905M39?
IS 1570 (Part 7) 40CrMoH and BS 970 (Part 1) 905M39 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.
On M-EX Right Now
IS 1570 (Part 7) 40CrMoH
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BS 970 (Part 1) 905M39
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Frequently Asked Questions
What is the difference between IS 1570 (Part 7) 40CrMoH and BS 970 (Part 1) 905M39?
IS 1570 (Part 7) 40CrMoH specifies Si, P, S which are not specified for BS 970 (Part 1) 905M39.
Can IS 1570 (Part 7) 40CrMoH be substituted with BS 970 (Part 1) 905M39?
IS 1570 (Part 7) 40CrMoH and BS 970 (Part 1) 905M39 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.