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BS 970 (Part 1) 708H20 vs EN 10084 18CrMo4

Strong Match — 87.1% match based on chemical composition and mechanical property overlap.

BS 970 (Part 1) 708H20 (BS 970 (Part 1):1983) and EN 10084 18CrMo4 (EN 10084:2008) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 1) 708H20 is typically used for case hardening steel supplied to specified hardenability limits (end quench test, table 10)., while EN 10084 18CrMo4 is commonly used for case hardened machine parts: carburized or carbonitrided, then hardened (clause 3.1). BS 970 (Part 1) 708H20 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) 708H20 vs EN 10084 18CrMo4 is a 87.1% 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 87.1%.

Frequently Compared With BS 970 (Part 1) 708H20:
IS 11169 (Part 1) 12Cr4Mo2 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 7) 10Mo6H NF A35-565 100C6 IS 1570 (Part 4) 103Cr6 IS 4367 07Cr4Mo6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
87.1%
MECHANICAL MATCH
No shared data
OVERALL
87.1%
Specifications
Property BS 970 (Part 1) 708H20 EN 10084 18CrMo4
Standard BS 970 (Part 1):1983 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 (%) <=0.035 <=0.025
S (%) <=0.040 <=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) 708H20 EN 10084 18CrMo4
Condition Not specified Soft annealed
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) 708H20
Case hardening steel supplied to specified hardenability limits (end quench test, Table 10).
EN 10084 18CrMo4
Case hardened machine parts: carburized or carbonitrided, then hardened (clause 3.1)
Key Differences
Can BS 970 (Part 1) 708H20 Be Substituted With EN 10084 18CrMo4?
BS 970 (Part 1) 708H20 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) 708H20 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) 708H20
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EN 10084 18CrMo4
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Frequently Asked Questions
What is the difference between BS 970 (Part 1) 708H20 and EN 10084 18CrMo4?
EN 10084 18CrMo4 specifies Si which is not specified for BS 970 (Part 1) 708H20.
Can BS 970 (Part 1) 708H20 be substituted with EN 10084 18CrMo4?
BS 970 (Part 1) 708H20 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) 708H20 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.