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GB/T 3077 18CrMnNiMo vs SAE J404 4320

Related Material — 69.3% match based on chemical composition and mechanical property overlap.

GB/T 3077 18CrMnNiMo (GB/T 3077:2015) and SAE J404 4320 (SAE J404:2009) are both steel grades. Both fall under the Alloy Steel category. GB/T 3077 18CrMnNiMo is typically used for hot-rolled or forged structural alloy steel bars, while SAE J404 4320 is commonly used for used for gears, shafts, aircraft components, pinions, axles, and transmission parts.. GB/T 3077 18CrMnNiMo is defined under Guobiao Standards (GB/T), originating from China, while SAE J404 4320 is defined under SAE International, originating from United States.

As per chemical composition, GB/T 3077 18CrMnNiMo vs SAE J404 4320 is a 69.3% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 69.3%.

Frequently Compared With GB/T 3077 18CrMnNiMo:
IS 1570 (Part 7) 10Mo6H 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
Match Breakdown
CHEMISTRY MATCH
69.3%
MECHANICAL MATCH
No shared data
OVERALL
69.3%
Specifications
Property GB/T 3077 18CrMnNiMo SAE J404 4320
Standard GB/T 3077:2015 SAE J404:2009
Category Alloy Steel Alloy Steel
C (%) 0.15-0.21 0.17-0.22
Si (%) 0.17-0.37 0.15-0.35
Mn (%) 1.10-1.40 0.45-0.65
Cr (%) 1.00-1.30 0.40-0.60
Mo (%) 0.20-0.30 0.20-0.30
Ni (%) 1.00-1.30 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 18CrMnNiMo SAE J404 4320
Tensile Strength >=1180 MPa Not specified
Yield Strength >=885 MPa Not specified
Elongation >=10% Not specified
Hardness <=269 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 18CrMnNiMo
Hot-rolled or forged structural alloy steel bars
SAE J404 4320
Used for gears, shafts, aircraft components, pinions, axles, and transmission parts.
Key Differences
Can GB/T 3077 18CrMnNiMo Be Substituted With SAE J404 4320?
GB/T 3077 18CrMnNiMo and SAE J404 4320 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
Forms & Sizes Available on M-EX
GB/T 3077 18CrMnNiMo
No active listings currently.
SAE J404 4320
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4600–4600 mm (181.1–181.1 in)
On M-EX Right Now
GB/T 3077 18CrMnNiMo
0 active listings and RFQs →
SAE J404 4320
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 3077 18CrMnNiMo and SAE J404 4320?
GB/T 3077 18CrMnNiMo specifies Cu which is not specified for SAE J404 4320.
Can GB/T 3077 18CrMnNiMo be substituted with SAE J404 4320?
GB/T 3077 18CrMnNiMo and SAE J404 4320 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.