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
0.10-0.30
<=0.25
1.0-1.30
0.10-0.18
<=0.060
Mechanical Properties
Tensile Strength
463-618 MPa (30-40 tons/sq in, converted)
Elongation
≥12%
Condition
size (diameter or width across flats) Over 1 3/4 to 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. They may, at the manufacturers option, be reheated before or after cold working, in the latter case to a temperature not exceeding 620 C. (Some lack of uniformity in hardness across the bar may be expected; minimised if the heat treatment is applied after cold working.)
Source: BS 970:1955, Part 2, En 7 (page 52)
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) 1/2 or less in
-
40-50
-
15
-
-
-
size (diameter or width across flats) Over 1/2 to 3/4 in
-
35-45
-
15
20
-
-
size (diameter or width across flats) Over 3/4 to 1 1/8 in
-
35-45
-
15
15
-
-
size (diameter or width across flats) Over 1 1/8 to 1 3/4 in
-
35-45
-
15
10
-
-
size (diameter or width across flats) Over 1 3/4 to 2 1/2 in
-
30-40
-
12
10
-
-
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 7 (page 52)
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 EN7 Listings on M-EX (For Sale)