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JIS G4202 SACM645 vs BS 970 (Part 1) 905M39

Close Alternative — 73.7% match based on chemical composition and mechanical property overlap.

JIS G4202 SACM645 (JIS G 4202:2005) and BS 970 (Part 1) 905M39 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Alloy Steel category. JIS G4202 SACM645 is typically used for nitrided gears, crankshafts, cylinder liners, gauges, while BS 970 (Part 1) 905M39 is commonly used for steel for surface hardening by nitriding (section three). JIS G4202 SACM645 is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 (Part 1) 905M39 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, JIS G4202 SACM645 vs BS 970 (Part 1) 905M39 is a 73.7% 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 73.7%.

Frequently Compared With JIS G4202 SACM645:
NF A35-565 100C6 GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
73.7%
MECHANICAL MATCH
No shared data
OVERALL
73.7%
Specifications
Property JIS G4202 SACM645 BS 970 (Part 1) 905M39
Standard JIS G 4202:2005 BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) 0.40–0.50 0.35-0.43
Si (%) 0.15–0.50 Not specified
Mn (%) 0.55–0.90 0.40-0.65
Cr (%) 1.30–1.70 1.40-1.80
Mo (%) 0.15–0.30 0.15-0.25
Al (%) 0.70–1.20 Not specified
P (%) ≤0.030 Not specified
S (%) ≤0.030 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 JIS G4202 SACM645 BS 970 (Part 1) 905M39
Tensile Strength 930–1080 MPa Not specified
Surface Hardness HV ≥900 (nitrided) Not specified
Core Hardness HB 269–321 Not specified
Typical Applications
JIS G4202 SACM645
Nitrided gears, crankshafts, cylinder liners, gauges
BS 970 (Part 1) 905M39
Steel for surface hardening by nitriding (section three)
Key Differences
Can JIS G4202 SACM645 Be Substituted With BS 970 (Part 1) 905M39?
JIS G4202 SACM645 and BS 970 (Part 1) 905M39 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.
Forms & Sizes Available on M-EX
JIS G4202 SACM645
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4600–5900 mm (181.1–232.28 in)
BS 970 (Part 1) 905M39
No active listings currently.
On M-EX Right Now
JIS G4202 SACM645
2 active listings and RFQs →
BS 970 (Part 1) 905M39
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4202 SACM645 and BS 970 (Part 1) 905M39?
JIS G4202 SACM645 specifies Si, Al, P, S which are not specified for BS 970 (Part 1) 905M39.
Can JIS G4202 SACM645 be substituted with BS 970 (Part 1) 905M39?
JIS G4202 SACM645 and BS 970 (Part 1) 905M39 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.