Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Si
Mn
S
P
0.07-0.15
<=0.10
0.80-1.20
0.20-0.30
<=0.070
Mechanical Properties
Tensile Strength
≥355 MPa (23 tons/sq in, converted)
Elongation
≥26%
Condition
As rolled, normalised or bright finished (other than cold rolled or cold drawn), ruling section 4 in (lowest-strength condition of the standard)
Typical Available Sizes
Round Bar
6mm–100mm dia
Hex Bar
10mm–75mm A/F
Sizes are indicative. Contact seller for exact availability.
More data from BS 970:1955
From the standard
Condition of material on delivery
Note
As rolled or forged unless the order states otherwise
Source: BS 970:1955, Part 2, En 1A (page 34)
Mechanical properties
Condition
Ruling section or size (in)
Tensile strength (tons/sq in)
Yield stress (tons/sq in)
Elongation (%)
Izod impact (ft lb)
Brinell (HB)
Proof stress 0.2% (tons/sq in), when requested
As rolled, normalised or bright finished (other than cold rolled or cold drawn)
4
23
-
26
-
-
-
Cold rolled or cold drawn, size 17/32 or less in
-
32
-
10
-
-
-
Cold rolled or cold drawn, size Over 17/32 to 1 1/2 in
-
28
-
14
-
-
-
Cold rolled or cold drawn, size Over 1 1/2 to 2 1/2 in
-
25
-
14
-
-
-
Cold rolled or cold drawn, size Over 2 1/2 to 4 in
-
23
-
14
-
-
-
Values as printed in BS 970:1955; tensile strength, yield stress and proof stress in tons/sq in, Izod in ft lb. Minimum unless a range is shown.
Source: BS 970:1955, Part 2, En 1A (page 34)
Notes
Note
Supplied as a free cutting steel for machining. Not supplied for case hardening and this requirement does not form part of the specification. For guidance only, a core strength of approximately 28 tons/sq in. should be expected if this steel is heat treated in accordance with the requirements of En32A. (As altered Feb. 1963)
Source: BS 970:1955, Part 2, En 1A
Status in the 1955 edition
Status
Deleted by Amendment 9
Reason
Amendment 9 (Feb 1972): carbon and carbon-manganese steels moved to BS 970 Part 1:1972
BS 970:1955 was amended up to Amendment 10 (June 1972); steels were moved to the revised Parts 1 to 5 and deleted from this edition.