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GB/T 3077 40CrNiMoA vs SAE J404 4340

Close Alternative — 75.9% match based on chemical composition and mechanical property overlap.

GB/T 3077 40CrNiMoA (GB/T 3077-2015) and SAE J404 4340 (SAE J404:2009) 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 SAE J404 4340 is commonly used for aircraft parts, heavy duty gears, crankshafts. GB/T 3077 40CrNiMoA is defined under Guobiao Standards (GB/T), originating from China, while SAE J404 4340 is defined under SAE International, originating from United States.

As per chemical composition, GB/T 3077 40CrNiMoA vs SAE J404 4340 is a 75.9% 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 75.9%.

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
75.9%
MECHANICAL MATCH
No shared data
OVERALL
75.9%
Specifications
Property GB/T 3077 40CrNiMoA SAE J404 4340
Standard GB/T 3077-2015 SAE J404:2009
Category Alloy Steel Alloy Steel
C (%) 0.37-0.44 0.38-0.43
Si (%) 0.17-0.37 0.15-0.35
Mn (%) 0.50-0.80 0.60-0.80
Cr (%) 0.60-0.90 0.70-0.90
Ni (%) 1.25-1.65 1.65-2.00
Mo (%) 0.15-0.25 0.20-0.30
P (%) 0.025 max <=0.030
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 SAE J404 4340
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.
SAE J404 4340
Aircraft parts, heavy duty gears, crankshafts
Can GB/T 3077 40CrNiMoA Be Substituted With SAE J404 4340?
GB/T 3077 40CrNiMoA and SAE J404 4340 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)
SAE J404 4340
Round Bar → (25 listings)
Diameter: 50–100 mm (1.97–3.94 in)
Length: 3800–7000 mm (149.61–275.59 in)
Forging → (4 listings)
Diameter: 150–200 mm (5.91–7.87 in)
Length: 500–1500 mm (19.69–59.06 in)
Flat Bar → (3 listings)
Thickness: 30–30 mm (1.18–1.18 in)
Width: 120–120 mm (4.72–4.72 in)
Length: 2500–3000 mm (98.43–118.11 in)
On M-EX Right Now
GB/T 3077 40CrNiMoA
2 active listings and RFQs →
SAE J404 4340
32 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 3077 40CrNiMoA and SAE J404 4340?
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 SAE J404 4340?
GB/T 3077 40CrNiMoA and SAE J404 4340 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.