Close Alternative — 82.7% match
based on chemical composition and mechanical property overlap.
EN 10083-3 34CrMoS4 (EN 10083-3:2006) and BS 970 (Part 3) 708M40 (BS 970 (Part 3):1991) are both steel grades.
Both fall under the Alloy Steel category.
EN 10083-3 34CrMoS4 is typically used for quenched and tempered, flame or induction hardened machine parts (clause 1), while BS 970 (Part 3) 708M40 is commonly 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).
EN 10083-3 34CrMoS4 is defined under European Standard (EN), originating from Europe, while BS 970 (Part 3) 708M40 is defined under British Standards (BS), originating from United Kingdom.
As per chemical composition, EN 10083-3 34CrMoS4 vs BS 970 (Part 3) 708M40 is a 82.7% 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 82.7%.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property
EN 10083-3 34CrMoS4
BS 970 (Part 3) 708M40
Condition
Quenched and tempered (+QT), ruling section d <= 16 mm
Not specified
Elongation
11% min
Not specified
Hardness
Soft annealed (+A): 223 HBW max
Not specified
Tensile Strength
1000 to 1200 MPa
Not specified
Yield Strength
800 MPa min
Not specified
Typical Applications
EN 10083-3 34CrMoS4
Quenched and tempered, flame or induction hardened machine parts (clause 1)
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)
Can EN 10083-3 34CrMoS4 Be Substituted With BS 970 (Part 3) 708M40?
EN 10083-3 34CrMoS4 and BS 970 (Part 3) 708M40 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.
What is the difference between EN 10083-3 34CrMoS4 and BS 970 (Part 3) 708M40?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can EN 10083-3 34CrMoS4 be substituted with BS 970 (Part 3) 708M40?
EN 10083-3 34CrMoS4 and BS 970 (Part 3) 708M40 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.