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

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

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

As per chemical composition, EN 10084 18CrMo4 vs BS 970 (Part 1) 708M20 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 EN 10084 18CrMo4:
IS 1570 (Part 7) 12Cr4Mo5H NF A35-565 100C6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 7) 10Mo6H IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 UNI 11234 100Cr6 IS 1570 (Part 4) 10Cr20Mo6
Match Breakdown
CHEMISTRY MATCH
86%
MECHANICAL MATCH
No shared data
OVERALL
86%
Specifications
Property EN 10084 18CrMo4 BS 970 (Part 1) 708M20
Standard EN 10084:2008 BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) 0.15-0.21 0.17-0.23
Cr (%) 0.90-1.20 0.85-1.15
Mn (%) 0.60-0.90 0.60-0.90
Mo (%) 0.15-0.25 0.15-0.25
P (%) <=0.025 Not specified
S (%) <=0.035 Not specified
Si (%) <=0.40 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 EN 10084 18CrMo4 BS 970 (Part 1) 708M20
Condition Soft annealed Case hardened, 19 mm test bar
Hardenability +H band at 1.5 mm from the quenched end: 39 to 47 HRC Not specified
Hardness Soft annealed: 207 HB max Not specified
Tensile Strength Not specified 930 MPa min
Elongation Not specified 10 % min
Typical Applications
EN 10084 18CrMo4
Case hardened machine parts: carburized or carbonitrided, then hardened (clause 3.1)
BS 970 (Part 1) 708M20
Case hardening steel (section four)
Key Differences
Can EN 10084 18CrMo4 Be Substituted With BS 970 (Part 1) 708M20?
EN 10084 18CrMo4 and BS 970 (Part 1) 708M20 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 708M20 is often considered as a substitute for EN 10084 18CrMo4 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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EN 10084 18CrMo4
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BS 970 (Part 1) 708M20
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Frequently Asked Questions
What is the difference between EN 10084 18CrMo4 and BS 970 (Part 1) 708M20?
EN 10084 18CrMo4 specifies P, S, Si which are not specified for BS 970 (Part 1) 708M20.
Can EN 10084 18CrMo4 be substituted with BS 970 (Part 1) 708M20?
EN 10084 18CrMo4 and BS 970 (Part 1) 708M20 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 708M20 is often considered as a substitute for EN 10084 18CrMo4 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.