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BS 970 EN20B vs BS 970 EN20A

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

BS 970 EN20B (BS 970:1955) and BS 970 EN20A (BS 970:1955) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN20B is defined under British Standards (BS), originating from United Kingdom, while BS 970 EN20A is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 EN20B vs BS 970 EN20A is a 80.7% match. As per mechanical properties, the match is 100%. Combined, this makes them a strong match overall at 87.1%.

Frequently Compared With BS 970 EN20B:
IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Mo6H
Match Breakdown
CHEMISTRY MATCH
80.7%
MECHANICAL MATCH
100%
OVERALL
87.1%
Specifications
Property BS 970 EN20B BS 970 EN20A
Standard BS 970:1955 BS 970:1955
Category Alloy Steel Alloy Steel
C (%) 0.35-0.45 0.20-0.30
Si (%) 0.10-0.35 0.10-0.35
Mn (%) 0.40-0.70 0.40-0.70
Cr (%) 1.00-1.50 0.50-1.00
Mo (%) 0.50-0.90 0.50-0.80
S (%) <=0.050 <=0.050
P (%) <=0.050 <=0.050
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 EN20B BS 970 EN20A
Tensile Strength ≥849 MPa (55 tons/sq in, converted) ≥849 MPa (55 tons/sq in, converted)
Yield Strength ≥680 MPa (44 tons/sq in, converted) ≥680 MPa (44 tons/sq in, converted)
Elongation ≥18% ≥18%
Hardness 248-302 HB 248-302 HB
Condition Hardened and tempered T, ruling section 2 1/2 in (lowest-strength condition of the standard) Hardened and tempered T, ruling section 2 1/2 in (lowest-strength condition of the standard)
Typical Applications
BS 970 EN20B
Not documented
BS 970 EN20A
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. Suitable for 55/65 (T), 60/70 (U), 65/75 (V) tons/sq in according to ruling section. En 20B same title.
Can BS 970 EN20B Be Substituted With BS 970 EN20A?
BS 970 EN20B and BS 970 EN20A overlap closely enough on chemistry and mechanical properties that BS 970 EN20A is often considered as a substitute for BS 970 EN20B 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 EN20B
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BS 970 EN20A
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Frequently Asked Questions
What is the difference between BS 970 EN20B and BS 970 EN20A?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN20B be substituted with BS 970 EN20A?
BS 970 EN20B and BS 970 EN20A overlap closely enough on chemistry and mechanical properties that BS 970 EN20A is often considered as a substitute for BS 970 EN20B in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.