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IS 1570 (Part 4) 31Ni10Cr3Mo6 vs BS 970 (Part 3) 826M40

Close Alternative — 83.7% match based on chemical composition and mechanical property overlap.

IS 1570 (Part 4) 31Ni10Cr3Mo6 (IS 1570 (Part 4):1988) and BS 970 (Part 3) 826M40 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Alloy Steel category. IS 1570 (Part 4) 31Ni10Cr3Mo6 is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 (Part 3) 826M40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, IS 1570 (Part 4) 31Ni10Cr3Mo6 vs BS 970 (Part 3) 826M40 is a 83.7% 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 83.7%.

Frequently Compared With IS 1570 (Part 4) 31Ni10Cr3Mo6:
IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 GB/T 3077 12Cr2Ni4A IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 7) 10Mo6H IS 1570 (Part 7) 12Cr4Mo5H IS 4367 07Cr4Mo6
Match Breakdown
CHEMISTRY MATCH
83.7%
MECHANICAL MATCH
No shared data
OVERALL
83.7%
Specifications
Property IS 1570 (Part 4) 31Ni10Cr3Mo6 BS 970 (Part 3) 826M40
Standard IS 1570 (Part 4):1988 BS 970 (Part 3):1991
Category Alloy Steel Alloy Steel
C (%) 0.27-0.35 0.36-0.44
Si (%) 0.10-0.35 0.10-0.40
Mn (%) 0.40-0.70 0.45-0.70
Ni (%) 2.25-2.75 2.30-2.80
Cr (%) 0.50-0.80 0.50-0.80
Mo (%) 0.40-0.70 0.45-0.65
P (%) Not specified <=0.035
S (%) Not specified <=0.040
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) 31Ni10Cr3Mo6 BS 970 (Part 3) 826M40
Tensile Strength 1190-1340 MPa Not specified
Yield Strength >=930 MPa (0.2 % proof stress) Not specified
Elongation >=10% Not specified
Izod Impact >=35 J Not specified
Hardness 341-401 HBS (guidance only) Not specified
Condition Bars and forgings, hardened and tempered (oil hardened unless stated), limiting ruling section 63 mm Not specified
Typical Applications
IS 1570 (Part 4) 31Ni10Cr3Mo6
Not documented
BS 970 (Part 3) 826M40
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy direct hardening steel (Table 16)
Key Differences
Can IS 1570 (Part 4) 31Ni10Cr3Mo6 Be Substituted With BS 970 (Part 3) 826M40?
IS 1570 (Part 4) 31Ni10Cr3Mo6 and BS 970 (Part 3) 826M40 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 4) 31Ni10Cr3Mo6
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BS 970 (Part 3) 826M40
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Frequently Asked Questions
What is the difference between IS 1570 (Part 4) 31Ni10Cr3Mo6 and BS 970 (Part 3) 826M40?
BS 970 (Part 3) 826M40 specifies P, S which are not specified for IS 1570 (Part 4) 31Ni10Cr3Mo6.
Can IS 1570 (Part 4) 31Ni10Cr3Mo6 be substituted with BS 970 (Part 3) 826M40?
IS 1570 (Part 4) 31Ni10Cr3Mo6 and BS 970 (Part 3) 826M40 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.