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GB/T 3077 40CrNi2Mo vs SAE J404 4340

Strong Match — 95.9% match based on chemical composition and mechanical property overlap.

GB/T 3077 40CrNi2Mo (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 40CrNi2Mo is typically used for hot-rolled or forged structural alloy steel bars, while SAE J404 4340 is commonly used for aircraft parts, heavy duty gears, crankshafts. GB/T 3077 40CrNi2Mo 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 40CrNi2Mo vs SAE J404 4340 is a 95.9% 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 95.9%.

Frequently Compared With GB/T 3077 40CrNi2Mo:
IS 1570 (Part 7) 10Mo6H UNI 11234 100Cr6 IS 4367 10Cr9Mo10 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
95.9%
MECHANICAL MATCH
No shared data
OVERALL
95.9%
Specifications
Property GB/T 3077 40CrNi2Mo SAE J404 4340
Standard GB/T 3077:2015 SAE J404:2009
Category Alloy Steel Alloy Steel
C (%) 0.38-0.43 0.38-0.43
Si (%) 0.17-0.37 0.15-0.35
Mn (%) 0.60-0.80 0.60-0.80
Cr (%) 0.70-0.90 0.70-0.90
Mo (%) 0.20-0.30 0.20-0.30
Ni (%) 1.65-2.00 1.65-2.00
P (%) <=0.030 <=0.030
S (%) <=0.030 <=0.040
Cu (%) <=0.30 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 GB/T 3077 40CrNi2Mo SAE J404 4340
Tensile Strength >=1050 MPa Not specified
Yield Strength >=980 MPa Not specified
Elongation >=12% Not specified
Hardness <=269 HB Not specified
Condition Quenched and tempered, test sample 25 mm; hardness is for bars delivered annealed or high temperature tempered Not specified
Typical Applications
GB/T 3077 40CrNi2Mo
Hot-rolled or forged structural alloy steel bars
SAE J404 4340
Aircraft parts, heavy duty gears, crankshafts
Key Differences
Can GB/T 3077 40CrNi2Mo Be Substituted With SAE J404 4340?
GB/T 3077 40CrNi2Mo and SAE J404 4340 overlap closely enough on chemistry and mechanical properties that SAE J404 4340 is often considered as a substitute for GB/T 3077 40CrNi2Mo 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
GB/T 3077 40CrNi2Mo
No active listings currently.
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 40CrNi2Mo
0 active listings and RFQs →
SAE J404 4340
32 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 3077 40CrNi2Mo and SAE J404 4340?
GB/T 3077 40CrNi2Mo specifies Cu which is not specified for SAE J404 4340.
Can GB/T 3077 40CrNi2Mo be substituted with SAE J404 4340?
GB/T 3077 40CrNi2Mo and SAE J404 4340 overlap closely enough on chemistry and mechanical properties that SAE J404 4340 is often considered as a substitute for GB/T 3077 40CrNi2Mo in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.