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BS 970 (Part 3) 708M40 vs EN 10083-1 42CrMo4

Strong Match — 89.6% match based on chemical composition and mechanical property overlap.

BS 970 (Part 3) 708M40 (BS 970 (Part 3):1991) and EN 10083-1 42CrMo4 (EN 10083-1:1991) are both steel grades. Both fall under the Alloy Steel category. BS 970 (Part 3) 708M40 is typically used for bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy direct hardening steel (table 16), while EN 10083-1 42CrMo4 is commonly used for quenched and tempered machine parts; non alloy steels also normalized (clause 1). BS 970 (Part 3) 708M40 is defined under British Standards (BS), originating from United Kingdom, while EN 10083-1 42CrMo4 is defined under European Standard (EN), originating from Europe.

As per chemical composition, BS 970 (Part 3) 708M40 vs EN 10083-1 42CrMo4 is a 89.6% 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 89.6%.

Frequently Compared With BS 970 (Part 3) 708M40:
IS 1570 (Part 4) 103Cr6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Mo6H IS 11169 (Part 1) 12Cr4Mo2 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
89.6%
MECHANICAL MATCH
No shared data
OVERALL
89.6%
Specifications
Property BS 970 (Part 3) 708M40 EN 10083-1 42CrMo4
Standard BS 970 (Part 3):1991 EN 10083-1:1991
Category Alloy Steel Alloy Steel
C (%) 0.36-0.44 0.38-0.45
Si (%) 0.10-0.40 <=0.40
Mn (%) 0.70-1.00 0.60-0.90
P (%) <=0.035 <=0.035
S (%) <=0.040 <=0.035
Cr (%) 0.90-1.20 0.90-1.20
Mo (%) 0.15-0.25 0.15-0.30
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 3) 708M40 EN 10083-1 42CrMo4
Condition Not specified Quenched and tempered, ruling section d <= 16 mm
Elongation Not specified 10% min
Hardness Not specified Soft annealed: 241 HB max
Tensile Strength Not specified 1100 to 1300 MPa
Yield Strength Not specified 900 MPa min
Typical Applications
BS 970 (Part 3) 708M40
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy direct hardening steel (Table 16)
EN 10083-1 42CrMo4
Quenched and tempered machine parts; non alloy steels also normalized (clause 1)
Can BS 970 (Part 3) 708M40 Be Substituted With EN 10083-1 42CrMo4?
BS 970 (Part 3) 708M40 and EN 10083-1 42CrMo4 overlap closely enough on chemistry and mechanical properties that EN 10083-1 42CrMo4 is often considered as a substitute for BS 970 (Part 3) 708M40 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 3) 708M40
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EN 10083-1 42CrMo4
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Frequently Asked Questions
What is the difference between BS 970 (Part 3) 708M40 and EN 10083-1 42CrMo4?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 (Part 3) 708M40 be substituted with EN 10083-1 42CrMo4?
BS 970 (Part 3) 708M40 and EN 10083-1 42CrMo4 overlap closely enough on chemistry and mechanical properties that EN 10083-1 42CrMo4 is often considered as a substitute for BS 970 (Part 3) 708M40 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.