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SAE J404 1340 vs GB/T 3077 40Mn2

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

SAE J404 1340 (SAE J404:2009) and GB/T 3077 40Mn2 (GB/T 3077:2015) are both steel grades. Both fall under the Alloy Steel category. SAE J404 1340 is typically used for chemistry-only alloy steel grade; see the composition notes for product scope, while GB/T 3077 40Mn2 is commonly used for hot-rolled or forged structural alloy steel bars. SAE J404 1340 is defined under SAE International, originating from United States, while GB/T 3077 40Mn2 is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, SAE J404 1340 vs GB/T 3077 40Mn2 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 SAE J404 1340:
IS 1570 (Part 4) 103Cr6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 IS 4367 07Cr4Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
90%
MECHANICAL MATCH
No shared data
OVERALL
90%
Specifications
Property SAE J404 1340 GB/T 3077 40Mn2
Standard SAE J404:2009 GB/T 3077:2015
Category Alloy Steel Alloy Steel
C (%) 0.38-0.43 0.37-0.44
Mn (%) 1.60-1.90 1.40-1.80
P (%) <=0.030 <=0.030
S (%) <=0.040 <=0.030
Si (%) 0.15-0.35 0.17-0.37
Cu (%) Not specified <=0.30
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property SAE J404 1340 GB/T 3077 40Mn2
Tensile Strength Not specified >=885 MPa
Yield Strength Not specified >=735 MPa
Elongation Not specified >=12%
Hardness Not specified <=217 HB
Condition Not specified Quenched and tempered, test sample 25 mm; hardness is for bars delivered annealed or high temperature tempered
Typical Applications
SAE J404 1340
Chemistry-only alloy steel grade; see the composition notes for product scope
GB/T 3077 40Mn2
Hot-rolled or forged structural alloy steel bars
Key Differences
Can SAE J404 1340 Be Substituted With GB/T 3077 40Mn2?
SAE J404 1340 and GB/T 3077 40Mn2 overlap closely enough on chemistry and mechanical properties that GB/T 3077 40Mn2 is often considered as a substitute for SAE J404 1340 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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SAE J404 1340
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GB/T 3077 40Mn2
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Frequently Asked Questions
What is the difference between SAE J404 1340 and GB/T 3077 40Mn2?
GB/T 3077 40Mn2 specifies Cu which is not specified for SAE J404 1340.
Can SAE J404 1340 be substituted with GB/T 3077 40Mn2?
SAE J404 1340 and GB/T 3077 40Mn2 overlap closely enough on chemistry and mechanical properties that GB/T 3077 40Mn2 is often considered as a substitute for SAE J404 1340 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.