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
1.00-1.40
0.30-0.60
<=0.060
Mechanical Properties
Tensile Strength
≥355 MPa (23 tons/sq in, converted)
Elongation
≥24%
Condition
As rolled or bright finished (other than cold rolled or cold drawn), ruling section 2 1/2 in (lowest-strength condition of the standard)
More data from BS 970:1955
From the standard
Condition of material on delivery
Note
Bars delivered in the as rolled condition unless the order states otherwise
Source: BS 970:1955, Part 2, En 1B (page 36)
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 or bright finished (other than cold rolled or cold drawn)
2 1/2
23
-
24
-
-
-
Cold rolled or cold drawn, size 17/32 or less in
-
27
-
10
-
-
-
Cold rolled or cold drawn, size Over 17/32 to 1 1/2 in
-
25
-
12
-
-
-
Cold rolled or cold drawn, size Over 1 1/2 to 2 1/2 in
-
23
-
12
-
-
-
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 1B (page 36)
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 1B
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.
Source: BS 970:1955, Amendment slips 6 to 10
Active BS 970:1955 EN1B Listings on M-EX (For Sale)