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GB/T 3077 40Mn2 vs SAE J404 1340

Strong Match — 90% match based on chemical composition and mechanical property overlap.

GB/T 3077 40Mn2 (GB/T 3077:2015) and SAE J404 1340 (SAE J404:2000) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 40Mn2 is typically used for hot-rolled or forged structural alloy steel bars, while SAE J404 1340 is commonly used for chemistry-only alloy steel grade; see the composition notes for product scope. GB/T 3077 40Mn2 is defined under Guobiao Standards (GB/T), originating from China, while SAE J404 1340 is defined under SAE International, originating from United States.

As per chemical composition, GB/T 3077 40Mn2 vs SAE J404 1340 is a 90% 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 90%.

Frequently Compared With GB/T 3077 40Mn2:
IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 UNI 11234 100Cr6 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 IS 4367 10Cr9Mo10 EN 10028-2 10CrMo9-10 IS 1570 (Part 4) 10Mo6
Match Breakdown
CHEMISTRY MATCH
90%
MECHANICAL MATCH
No shared data
OVERALL
90%
Specifications
Property GB/T 3077 40Mn2 SAE J404 1340
Standard GB/T 3077:2015 SAE J404:2000
Category Alloy Steel Alloy Steel
C (%) 0.37-0.44 0.38-0.43
Si (%) 0.17-0.37 0.15-0.35
Mn (%) 1.40-1.80 1.60-1.90
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 40Mn2 SAE J404 1340
Tensile Strength >=885 MPa Not specified
Yield Strength >=735 MPa Not specified
Elongation >=12% Not specified
Hardness <=217 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 40Mn2
Hot-rolled or forged structural alloy steel bars
SAE J404 1340
Chemistry-only alloy steel grade; see the composition notes for product scope
Key Differences
Can GB/T 3077 40Mn2 Be Substituted With SAE J404 1340?
GB/T 3077 40Mn2 and SAE J404 1340 overlap closely enough on chemistry and mechanical properties that SAE J404 1340 is often considered as a substitute for GB/T 3077 40Mn2 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
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GB/T 3077 40Mn2
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SAE J404 1340
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Frequently Asked Questions
What is the difference between GB/T 3077 40Mn2 and SAE J404 1340?
GB/T 3077 40Mn2 specifies Cu which is not specified for SAE J404 1340.
Can GB/T 3077 40Mn2 be substituted with SAE J404 1340?
GB/T 3077 40Mn2 and SAE J404 1340 overlap closely enough on chemistry and mechanical properties that SAE J404 1340 is often considered as a substitute for GB/T 3077 40Mn2 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.