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IS 4367 40Cr4Mo3 vs BS 970 (Part 1) 709M40

Close Alternative — 83.4% match based on chemical composition and mechanical property overlap.

IS 4367 40Cr4Mo3 (IS 4367:1991) and BS 970 (Part 1) 709M40 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Alloy Steel category. IS 4367 40Cr4Mo3 is typically used for gears, crankshafts, connecting rods, heavy duty shafts, high strength bolts, forged components, while BS 970 (Part 1) 709M40 is commonly used for used for aircraft parts, heavy-duty gears, transmission shafts, connecting rods, crankshafts, and engineering fasteners.. IS 4367 40Cr4Mo3 is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 (Part 1) 709M40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, IS 4367 40Cr4Mo3 vs BS 970 (Part 1) 709M40 is a 83.4% 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 83.4%.

Frequently Compared With IS 4367 40Cr4Mo3:
GOST 4543 12HN3A NF A35-565 100C6 GB/T 3077 12Cr2Ni4A UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 103Cr4 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
83.4%
MECHANICAL MATCH
No shared data
OVERALL
83.4%
Specifications
Property IS 4367 40Cr4Mo3 BS 970 (Part 1) 709M40
Standard IS 4367:1991 BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) 0.35-0.45 0.36-0.44
Si (%) 0.10-0.35 Not specified
Mn (%) 0.50-0.80 0.70-1.00
Cr (%) 0.90-1.20 0.90-1.20
Mo (%) 0.20-0.35 0.25-0.35
S (%) <=0.035 Not specified
P (%) <=0.035 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property IS 4367 40Cr4Mo3 BS 970 (Part 1) 709M40
Tensile Strength 700-850 MPa Not specified
Yield Strength 540 MPa min Not specified
Elongation >=18% Not specified
Izod Impact 55 J min Not specified
Hardness 208-252 HB Not specified
Hardness (soft annealed) <=220 HB Not specified
Condition Hardened and tempered, ruling section up to 150 mm Not specified
Typical Applications
IS 4367 40Cr4Mo3
gears, crankshafts, connecting rods, heavy duty shafts, high strength bolts, forged components
BS 970 (Part 1) 709M40
Used for aircraft parts, heavy-duty gears, transmission shafts, connecting rods, crankshafts, and engineering fasteners.
Key Differences
Can IS 4367 40Cr4Mo3 Be Substituted With BS 970 (Part 1) 709M40?
IS 4367 40Cr4Mo3 and BS 970 (Part 1) 709M40 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.
Forms & Sizes Available on M-EX
IS 4367 40Cr4Mo3
Round Bar → (4 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5200–6700 mm (204.72–263.78 in)
BS 970 (Part 1) 709M40
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6600–6800 mm (259.84–267.72 in)
On M-EX Right Now
IS 4367 40Cr4Mo3
4 active listings and RFQs →
BS 970 (Part 1) 709M40
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between IS 4367 40Cr4Mo3 and BS 970 (Part 1) 709M40?
IS 4367 40Cr4Mo3 specifies Si, S, P which are not specified for BS 970 (Part 1) 709M40.
Can IS 4367 40Cr4Mo3 be substituted with BS 970 (Part 1) 709M40?
IS 4367 40Cr4Mo3 and BS 970 (Part 1) 709M40 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.