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GB/T 3077 40CrNiMoA vs BS 970 (Part 3) 817M40

Close Alternative — 75.8% match based on chemical composition and mechanical property overlap.

GB/T 3077 40CrNiMoA (GB/T 3077-2015) and BS 970 (Part 3) 817M40 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 40CrNiMoA is typically used for used for crankshafts, turbine shafts, heavy-duty gears, aircraft landing parts, bolts, and pressure components., while BS 970 (Part 3) 817M40 is commonly used for high tensile shafts, gears, crankshafts. GB/T 3077 40CrNiMoA is defined under Guobiao Standards (GB/T), originating from China, while BS 970 (Part 3) 817M40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, GB/T 3077 40CrNiMoA vs BS 970 (Part 3) 817M40 is a 75.8% 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 75.8%.

Frequently Compared With GB/T 3077 40CrNiMoA:
GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A UNI 11234 100Cr6 NF A35-565 100C6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
75.8%
MECHANICAL MATCH
No shared data
OVERALL
75.8%
Specifications
Property GB/T 3077 40CrNiMoA BS 970 (Part 3) 817M40
Standard GB/T 3077-2015 BS 970 (Part 3):1991
Category Alloy Steel Alloy Steel
C (%) 0.37-0.44 0.36-0.44
Si (%) 0.17-0.37 0.10-0.40
Mn (%) 0.50-0.80 0.45-0.70
Cr (%) 0.60-0.90 1.00-1.40
Ni (%) 1.25-1.65 1.30-1.70
Mo (%) 0.15-0.25 0.20-0.35
P (%) 0.025 max <=0.035
S (%) 0.025 max <=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 GB/T 3077 40CrNiMoA BS 970 (Part 3) 817M40
Tensile Strength 1080-1280 MPa Not specified
Yield Strength 930-1080 MPa Not specified
Elongation 10-14% Not specified
Hardness 30-38 HRC Not specified
Typical Applications
GB/T 3077 40CrNiMoA
Used for crankshafts, turbine shafts, heavy-duty gears, aircraft landing parts, bolts, and pressure components.
BS 970 (Part 3) 817M40
High tensile shafts, gears, crankshafts
Can GB/T 3077 40CrNiMoA Be Substituted With BS 970 (Part 3) 817M40?
GB/T 3077 40CrNiMoA and BS 970 (Part 3) 817M40 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
GB/T 3077 40CrNiMoA
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4200–7000 mm (165.35–275.59 in)
BS 970 (Part 3) 817M40
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6200–6500 mm (244.09–255.91 in)
On M-EX Right Now
GB/T 3077 40CrNiMoA
2 active listings and RFQs →
BS 970 (Part 3) 817M40
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 3077 40CrNiMoA and BS 970 (Part 3) 817M40?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 3077 40CrNiMoA be substituted with BS 970 (Part 3) 817M40?
GB/T 3077 40CrNiMoA and BS 970 (Part 3) 817M40 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.