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GOST 4543 40HM vs BS 970 (Part 1) 709M40

Close Alternative — 83.3% match based on chemical composition and mechanical property overlap.

GOST 4543 40HM (GOST 4543-2016) and BS 970 (Part 1) 709M40 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Alloy Steel category. GOST 4543 40HM is typically used for used for gears, shafts, spindles, bolts, and hydraulic 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.. BS 970 (Part 1) 709M40 is defined under British Standards (BS) (United Kingdom).

As per chemical composition, GOST 4543 40HM vs BS 970 (Part 1) 709M40 is a 83.3% 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 83.3%.

Frequently Compared With GOST 4543 40HM:
NF A35-565 100C6 GOST 4543 12HN3A UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 4367 10Cr9Mo10 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 103Cr6
Match Breakdown
CHEMISTRY MATCH
83.3%
MECHANICAL MATCH
No shared data
OVERALL
83.3%
Specifications
Property GOST 4543 40HM BS 970 (Part 1) 709M40
Standard GOST 4543-2016 BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) 0.36-0.44 0.36-0.44
Cr (%) 0.9-1.2 0.90-1.20
Mo (%) 0.15-0.3 0.25-0.35
Mn (%) 0.5-0.8 0.70-1.00
Si (%) 0.17-0.37 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 GOST 4543 40HM BS 970 (Part 1) 709M40
Tensile Strength 980-1180 MPa Not specified
Yield Strength 835 MPa min Not specified
Elongation 10% min Not specified
Hardness 285-341 HB Not specified
Typical Applications
GOST 4543 40HM
Used for gears, shafts, spindles, bolts, and hydraulic components.
BS 970 (Part 1) 709M40
Used for aircraft parts, heavy-duty gears, transmission shafts, connecting rods, crankshafts, and engineering fasteners.
Key Differences
Can GOST 4543 40HM Be Substituted With BS 970 (Part 1) 709M40?
GOST 4543 40HM 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
GOST 4543 40HM
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6300–7000 mm (248.03–275.59 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
GOST 4543 40HM
2 active listings and RFQs →
BS 970 (Part 1) 709M40
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GOST 4543 40HM and BS 970 (Part 1) 709M40?
GOST 4543 40HM specifies Si which is not specified for BS 970 (Part 1) 709M40.
Can GOST 4543 40HM be substituted with BS 970 (Part 1) 709M40?
GOST 4543 40HM 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.