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
0.15-0.25
0.05-0.35
0.60-1.00
<=0.060
<=0.060
Mechanical Properties
Tensile Strength
≥432 MPa (28 tons/sq in, converted)
Elongation
≥15%
Condition
size (diameter or width across flats) Over 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 cold drawn condition
Source: BS 970:1955, Part 2, En 3D (page 43)
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
size (diameter or width across flats) 1 1/4 or less in
-
35
-
15
-
-
-
size (diameter or width across flats) Over 1 1/4 to 2 1/2 in
-
30
-
15
-
-
-
size (diameter or width across flats) Over 2 1/2 in
-
28
-
15
-
-
-
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 3D (page 43)
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
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