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JIS G4102 SNC815 vs BS 970 (Part 1) 637H17

Related Material — 69.9% match based on chemical composition and mechanical property overlap.

JIS G4102 SNC815 (JIS G 4102:1979) and BS 970 (Part 1) 637H17 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Alloy Steel category. JIS G4102 SNC815 is typically used for heavily stressed gears, differential components, while BS 970 (Part 1) 637H17 is commonly used for case hardening steel (section four). JIS G4102 SNC815 is defined under Japanese Industrial Standards (JIS), originating from Japan, while BS 970 (Part 1) 637H17 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, JIS G4102 SNC815 vs BS 970 (Part 1) 637H17 is a 75.7% 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 69.9%.

Frequently Compared With JIS G4102 SNC815:
NF A35-565 100C6 UNI 11234 100Cr6 GOST 4543 12HN3A GB/T 3077 12Cr2Ni4A IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 07Cr4Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6
Match Breakdown
CHEMISTRY MATCH
75.7%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property JIS G4102 SNC815 BS 970 (Part 1) 637H17
Standard JIS G 4102:1979 BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) 0.12–0.18 0.14-0.20
Si (%) 0.15–0.35 Not specified
Mn (%) 0.30–0.60 0.60-0.90
Cr (%) 0.60–1.00 0.60-1.00
Ni (%) 3.00–3.50 0.85-1.25
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 G4102 SNC815 BS 970 (Part 1) 637H17
Tensile Strength ≥980 MPa Not specified
Case Hardness HRC 60–65 Not specified
Typical Applications
JIS G4102 SNC815
Heavily stressed gears, differential components
BS 970 (Part 1) 637H17
Case hardening steel (section four)
Key Differences
Can JIS G4102 SNC815 Be Substituted With BS 970 (Part 1) 637H17?
JIS G4102 SNC815 and BS 970 (Part 1) 637H17 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
JIS G4102 SNC815
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 4900–5900 mm (192.91–232.28 in)
BS 970 (Part 1) 637H17
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On M-EX Right Now
JIS G4102 SNC815
2 active listings and RFQs →
BS 970 (Part 1) 637H17
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Frequently Asked Questions
What is the difference between JIS G4102 SNC815 and BS 970 (Part 1) 637H17?
JIS G4102 SNC815 specifies Si, P, S which are not specified for BS 970 (Part 1) 637H17.
Can JIS G4102 SNC815 be substituted with BS 970 (Part 1) 637H17?
JIS G4102 SNC815 and BS 970 (Part 1) 637H17 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.