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EN 10084 18NiCr5-4 vs BS 970 (Part 3) 637M17

Close Alternative — 77.9% match based on chemical composition and mechanical property overlap.

EN 10084 18NiCr5-4 (EN 10084:2008) and BS 970 (Part 3) 637M17 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Alloy Steel category. EN 10084 18NiCr5-4 is typically used for case hardened machine parts: carburized or carbonitrided, then hardened (clause 3.1), while BS 970 (Part 3) 637M17 is commonly used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy case hardening steel (table 15). EN 10084 18NiCr5-4 is defined under European Standard (EN), originating from Europe, while BS 970 (Part 3) 637M17 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, EN 10084 18NiCr5-4 vs BS 970 (Part 3) 637M17 is a 77.9% 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 77.9%.

Frequently Compared With EN 10084 18NiCr5-4:
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 4) 10Mo6 IS 11169 (Part 1) 10Ni5Cr4 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
77.9%
MECHANICAL MATCH
No shared data
OVERALL
77.9%
Specifications
Property EN 10084 18NiCr5-4 BS 970 (Part 3) 637M17
Standard EN 10084:2008 BS 970 (Part 3):1991
Category Alloy Steel Alloy Steel
C (%) 0.16-0.21 0.14-0.20
Cr (%) 0.90-1.20 0.60-1.00
Mn (%) 0.60-0.90 0.60-0.90
Ni (%) 1.20-1.50 0.85-1.25
P (%) <=0.025 <=0.04
S (%) <=0.035 <=0.05
Si (%) <=0.40 0.10-0.40
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property EN 10084 18NiCr5-4 BS 970 (Part 3) 637M17
Condition Soft annealed Not specified
Hardenability +H band at 1.5 mm from the quenched end: 41 to 49 HRC Not specified
Hardness Soft annealed: 223 HB max Not specified
Typical Applications
EN 10084 18NiCr5-4
Case hardened machine parts: carburized or carbonitrided, then hardened (clause 3.1)
BS 970 (Part 3) 637M17
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy case hardening steel (Table 15)
Can EN 10084 18NiCr5-4 Be Substituted With BS 970 (Part 3) 637M17?
EN 10084 18NiCr5-4 and BS 970 (Part 3) 637M17 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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EN 10084 18NiCr5-4
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BS 970 (Part 3) 637M17
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Frequently Asked Questions
What is the difference between EN 10084 18NiCr5-4 and BS 970 (Part 3) 637M17?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can EN 10084 18NiCr5-4 be substituted with BS 970 (Part 3) 637M17?
EN 10084 18NiCr5-4 and BS 970 (Part 3) 637M17 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.