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IS 11169 (Part 1) 40Cr4Mo3 vs BS 970 (Part 1) 709M40

Strong Match — 85.1% match based on chemical composition and mechanical property overlap.

IS 11169 (Part 1) 40Cr4Mo3 (IS 11169 (Part 1):1984) and BS 970 (Part 1) 709M40 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Alloy Steel category. IS 11169 (Part 1) 40Cr4Mo3 is typically used for cold heading and cold extrusion; the standard covers wires, wire rods and bars of 2 to 100 mm diameter (clause 1.1), 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 11169 (Part 1) 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 11169 (Part 1) 40Cr4Mo3 vs BS 970 (Part 1) 709M40 is a 85.1% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a strong match overall at 85.1%.

Frequently Compared With IS 11169 (Part 1) 40Cr4Mo3:
IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Mo6H IS 4367 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6 UNI 11234 100Cr6 IS 1570 (Part 4) 10Cr20Mo6 NF A35-565 100C6
Match Breakdown
CHEMISTRY MATCH
85.1%
MECHANICAL MATCH
No shared data
OVERALL
85.1%
Specifications
Property IS 11169 (Part 1) 40Cr4Mo3 BS 970 (Part 1) 709M40
Standard IS 11169 (Part 1):1984 BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) 0.35-0.45 0.36-0.44
Mn (%) 0.50-0.80 0.70-1.00
Si (%) 0.10-0.35 Not specified
Cr (%) 0.90-1.20 0.90-1.20
Mo (%) 0.20-0.35 0.25-0.35
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property IS 11169 (Part 1) 40Cr4Mo3 BS 970 (Part 1) 709M40
Tensile Strength (hardened and tempered) 1100-1300 MPa (16 mm) / 1000-1200 MPa (40 mm) / 900-1100 MPa (100 mm) Not specified
0.2% Proof Stress >=900 MPa (16 mm) / >=750 MPa (40 mm) / >=700 MPa (100 mm) Not specified
Elongation >=10% (16 mm) / >=11% (40 mm) / >=12% (100 mm) Not specified
Hardness, annealed <=200 HB Not specified
Typical Applications
IS 11169 (Part 1) 40Cr4Mo3
Cold heading and cold extrusion; the standard covers wires, wire rods and bars of 2 to 100 mm diameter (clause 1.1)
BS 970 (Part 1) 709M40
Used for aircraft parts, heavy-duty gears, transmission shafts, connecting rods, crankshafts, and engineering fasteners.
Key Differences
Can IS 11169 (Part 1) 40Cr4Mo3 Be Substituted With BS 970 (Part 1) 709M40?
IS 11169 (Part 1) 40Cr4Mo3 and BS 970 (Part 1) 709M40 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 709M40 is often considered as a substitute for IS 11169 (Part 1) 40Cr4Mo3 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
IS 11169 (Part 1) 40Cr4Mo3
No active listings currently.
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 11169 (Part 1) 40Cr4Mo3
0 active listings and RFQs →
BS 970 (Part 1) 709M40
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between IS 11169 (Part 1) 40Cr4Mo3 and BS 970 (Part 1) 709M40?
IS 11169 (Part 1) 40Cr4Mo3 specifies Si which is not specified for BS 970 (Part 1) 709M40.
Can IS 11169 (Part 1) 40Cr4Mo3 be substituted with BS 970 (Part 1) 709M40?
IS 11169 (Part 1) 40Cr4Mo3 and BS 970 (Part 1) 709M40 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 709M40 is often considered as a substitute for IS 11169 (Part 1) 40Cr4Mo3 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.