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BS 970 EN33 vs BS 970 EN21

Close Alternative — 74% match based on chemical composition and mechanical property overlap.

BS 970 EN33 (BS 970:1955) and BS 970 EN21 (BS 970:1955) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN33 is typically used for bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. suitable for tensile strength of 45 tons/sq in min., while BS 970 EN21 is commonly used for bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. suitable for 45/55 (r) and 50/60 (s) tons/sq in according to ruling section.. BS 970 EN33 is defined under British Standards (BS), originating from United Kingdom, while BS 970 EN21 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 EN33 vs BS 970 EN21 is a 86% match. As per mechanical properties, the match is 50%. Combined, this makes them a close alternative overall at 74%.

Frequently Compared With BS 970 EN33:
IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Mo6H UNI 11234 100Cr6 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
86%
MECHANICAL MATCH
50%
OVERALL
74%
Specifications
Property BS 970 EN33 BS 970 EN21
Standard BS 970:1955 BS 970:1955
Category Alloy Steel Alloy Steel
C (%) 0.10-0.15 0.25-0.35
Si (%) 0.10-0.35 0.10-0.35
Mn (%) 0.30-0.60 0.35-0.75
Ni (%) 2.75-3.50 2.75-3.25
Cr (%) <=0.30 <=0.30
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 EN33 BS 970 EN21
Tensile Strength ≥695 MPa (45 tons/sq in, converted) ≥695 MPa (45 tons/sq in, converted)
Elongation ≥18% ≥22%
Condition Core, after heat treatment (lowest-strength condition of the standard) Hardened and tempered R, ruling section 4 in (lowest-strength condition of the standard)
Yield Strength Not specified ≥494 MPa (32 tons/sq in, converted)
Hardness Not specified 201-255 HB
Typical Applications
BS 970 EN33
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. Suitable for tensile strength of 45 tons/sq in min.
BS 970 EN21
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. Suitable for 45/55 (R) and 50/60 (S) tons/sq in according to ruling section.
Can BS 970 EN33 Be Substituted With BS 970 EN21?
BS 970 EN33 and BS 970 EN21 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 EN33
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BS 970 EN21
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Frequently Asked Questions
What is the difference between BS 970 EN33 and BS 970 EN21?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN33 be substituted with BS 970 EN21?
BS 970 EN33 and BS 970 EN21 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.