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GB/T 3077 20MnMoB vs SAE J404 4023

Close Alternative — 78.1% match based on chemical composition and mechanical property overlap.

GB/T 3077 20MnMoB (GB/T 3077:2015) and SAE J404 4023 (SAE J404:2009) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 20MnMoB is typically used for hot-rolled or forged structural alloy steel bars, while SAE J404 4023 is commonly used for chemistry-only alloy steel grade; see the composition notes for product scope. GB/T 3077 20MnMoB is defined under Guobiao Standards (GB/T), originating from China, while SAE J404 4023 is defined under SAE International, originating from United States.

As per chemical composition, GB/T 3077 20MnMoB vs SAE J404 4023 is a 78.1% 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 78.1%.

Frequently Compared With GB/T 3077 20MnMoB:
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
78.1%
MECHANICAL MATCH
No shared data
OVERALL
78.1%
Specifications
Property GB/T 3077 20MnMoB SAE J404 4023
Standard GB/T 3077:2015 SAE J404:2009
Category Alloy Steel Alloy Steel
C (%) 0.16-0.22 0.20-0.25
Si (%) 0.17-0.37 0.15-0.35
Mn (%) 0.90-1.20 0.70-0.90
Mo (%) 0.20-0.30 0.20-0.30
B (%) 0.0008-0.0035 Not specified
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 20MnMoB SAE J404 4023
Tensile Strength >=1080 MPa Not specified
Yield Strength >=885 MPa Not specified
Elongation >=10% Not specified
Hardness <=207 HB Not specified
Condition Quenched and tempered, test sample 15 mm; hardness is for bars delivered annealed or high temperature tempered Not specified
Typical Applications
GB/T 3077 20MnMoB
Hot-rolled or forged structural alloy steel bars
SAE J404 4023
Chemistry-only alloy steel grade; see the composition notes for product scope
Key Differences
Can GB/T 3077 20MnMoB Be Substituted With SAE J404 4023?
GB/T 3077 20MnMoB and SAE J404 4023 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.
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GB/T 3077 20MnMoB
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SAE J404 4023
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Frequently Asked Questions
What is the difference between GB/T 3077 20MnMoB and SAE J404 4023?
GB/T 3077 20MnMoB specifies B, Cu which are not specified for SAE J404 4023.
Can GB/T 3077 20MnMoB be substituted with SAE J404 4023?
GB/T 3077 20MnMoB and SAE J404 4023 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.