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BS 970 EN19B vs BS 970 (Part 3) 709M40

Strong Match — 85.4% match based on chemical composition and mechanical property overlap.

BS 970 EN19B (BS 970:1955) and BS 970 (Part 3) 709M40 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN19B is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 3) 709M40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 EN19B vs BS 970 (Part 3) 709M40 is a 85.4% 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 85.4%.

Frequently Compared With BS 970 EN19B:
IS 1570 (Part 4) 10Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 IS 1570 (Part 7) 10Mo6H IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 10Cr20Mo6
Match Breakdown
CHEMISTRY MATCH
85.4%
MECHANICAL MATCH
No shared data
OVERALL
85.4%
Specifications
Property BS 970 EN19B BS 970 (Part 3) 709M40
Standard BS 970:1955 BS 970 (Part 3):1991
Category Alloy Steel Alloy Steel
C (%) 0.35-0.40 0.36-0.44
Si (%) 0.10-0.35 0.10-0.40
Mn (%) 0.50-0.80 0.70-1.00
Cr (%) 0.90-1.20 0.90-1.20
Mo (%) 0.20-0.35 0.25-0.35
S (%) <=0.050 <=0.040
P (%) <=0.050 <=0.035
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 EN19B BS 970 (Part 3) 709M40
Tensile Strength ≥695 MPa (45 tons/sq in, converted) Not specified
Yield Strength ≥525 MPa (34 tons/sq in, converted) Not specified
Elongation ≥22% Not specified
Hardness 201-255 HB Not specified
Condition Hardened and tempered R, ruling section 6 in (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN19B
Not documented
BS 970 (Part 3) 709M40
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy direct hardening steel (Table 16)
Can BS 970 EN19B Be Substituted With BS 970 (Part 3) 709M40?
BS 970 EN19B and BS 970 (Part 3) 709M40 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 709M40 is often considered as a substitute for BS 970 EN19B 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 EN19B
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BS 970 (Part 3) 709M40
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Frequently Asked Questions
What is the difference between BS 970 EN19B and BS 970 (Part 3) 709M40?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN19B be substituted with BS 970 (Part 3) 709M40?
BS 970 EN19B and BS 970 (Part 3) 709M40 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 3) 709M40 is often considered as a substitute for BS 970 EN19B in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.