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BS 970 EN27 vs BS 970 EN25

Close Alternative — 84% match based on chemical composition and mechanical property overlap.

BS 970 EN27 (BS 970:1955) and BS 970 EN25 (BS 970:1955) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN27 is typically used for 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), 70/80 (w) tons/sq in according to ruling section., while BS 970 EN25 is commonly used for bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. suitable for t to z (55/65 to 100 tons/sq in) according to ruling section.. BS 970 EN27 is defined under British Standards (BS), originating from United Kingdom, while BS 970 EN25 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 EN27 vs BS 970 EN25 is a 76% match. As per mechanical properties, the match is 100%. Combined, this makes them a close alternative overall at 84%.

Frequently Compared With BS 970 EN27:
IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Mo6H
Match Breakdown
CHEMISTRY MATCH
76%
MECHANICAL MATCH
100%
OVERALL
84%
Specifications
Property BS 970 EN27 BS 970 EN25
Standard BS 970:1955 BS 970:1955
Category Alloy Steel Alloy Steel
C (%) 0.25-0.35 0.27-0.35
Si (%) 0.10-0.35 0.10-0.35
Mn (%) <=0.70 0.50-0.70
Ni (%) 3.00-3.75 2.30-2.80
Cr (%) 0.50-1.30 0.50-0.80
Mo (%) 0.20-0.65 0.40-0.70
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 EN27 BS 970 EN25
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 6 in (lowest-strength condition of the standard) Hardened and tempered T, ruling section 6 in (lowest-strength condition of the standard)
Typical Applications
BS 970 EN27
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), 70/80 (W) tons/sq in according to ruling section.
BS 970 EN25
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. Suitable for T to Z (55/65 to 100 tons/sq in) according to ruling section.
Can BS 970 EN27 Be Substituted With BS 970 EN25?
BS 970 EN27 and BS 970 EN25 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.
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BS 970 EN27
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BS 970 EN25
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Frequently Asked Questions
What is the difference between BS 970 EN27 and BS 970 EN25?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN27 be substituted with BS 970 EN25?
BS 970 EN27 and BS 970 EN25 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.