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BS 970 (Part 1) 708M20 vs EN 10084 18CrMo4

Strong Match — 86% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 708M20 (BS 970 (Part 1):1991) and EN 10084 18CrMo4 (EN 10084:2008) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 1) 708M20 is typically used for case hardening steel (section four), while EN 10084 18CrMo4 is commonly used for case hardened machine parts: carburized or carbonitrided, then hardened (clause 3.1). BS 970 (Part 1) 708M20 is defined under British Standards (BS), originating from United Kingdom, while EN 10084 18CrMo4 is defined under European Standard (EN), originating from Europe.

As per chemical composition, BS 970 (Part 1) 708M20 vs EN 10084 18CrMo4 is a 86% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a strong match overall at 86%.

Frequently Compared With BS 970 (Part 1) 708M20:
IS 1570 (Part 4) 10Mo6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 7) 10Mo6H
Match Breakdown
CHEMISTRY MATCH
86%
MECHANICAL MATCH
No shared data
OVERALL
86%
Specifications
Property BS 970 (Part 1) 708M20 EN 10084 18CrMo4
Standard BS 970 (Part 1):1991 EN 10084:2008
Category Alloy Steel Alloy Steel
C (%) 0.17-0.23 0.15-0.21
Mn (%) 0.60-0.90 0.60-0.90
Cr (%) 0.85-1.15 0.90-1.20
Mo (%) 0.15-0.25 0.15-0.25
P (%) Not specified <=0.025
S (%) Not specified <=0.035
Si (%) Not specified <=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 BS 970 (Part 1) 708M20 EN 10084 18CrMo4
Condition Case hardened, 19 mm test bar Soft annealed
Tensile Strength 930 MPa min Not specified
Elongation 10 % min Not specified
Hardenability Not specified +H band at 1.5 mm from the quenched end: 39 to 47 HRC
Hardness Not specified Soft annealed: 207 HB max
Typical Applications
BS 970 (Part 1) 708M20
Case hardening steel (section four)
EN 10084 18CrMo4
Case hardened machine parts: carburized or carbonitrided, then hardened (clause 3.1)
Key Differences
Can BS 970 (Part 1) 708M20 Be Substituted With EN 10084 18CrMo4?
BS 970 (Part 1) 708M20 and EN 10084 18CrMo4 overlap closely enough on chemistry and mechanical properties that EN 10084 18CrMo4 is often considered as a substitute for BS 970 (Part 1) 708M20 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
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BS 970 (Part 1) 708M20
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EN 10084 18CrMo4
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Frequently Asked Questions
What is the difference between BS 970 (Part 1) 708M20 and EN 10084 18CrMo4?
EN 10084 18CrMo4 specifies P, S, Si which are not specified for BS 970 (Part 1) 708M20.
Can BS 970 (Part 1) 708M20 be substituted with EN 10084 18CrMo4?
BS 970 (Part 1) 708M20 and EN 10084 18CrMo4 overlap closely enough on chemistry and mechanical properties that EN 10084 18CrMo4 is often considered as a substitute for BS 970 (Part 1) 708M20 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.