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
0.17-0.23
0.05-0.35
0.60-1.00
<=0.050
<=0.050
Mechanical Properties
Tensile Strength
≥432 MPa (28 tons/sq in, converted)
Elongation
≥25%
Condition
, ruling section 6 in (lowest-strength condition of the standard)
Typical Available Sizes
Round Bar
10mm–150mm dia
Flat Bar
16×5mm–100×20mm
Sizes are indicative. Contact seller for exact availability.
More data from BS 970:1955
From the standard
Condition of material on delivery
A
Bars and billets for forging as rolled or forged unless the order states otherwise.
B
Forgings and drop-forgings in the finally heat treated condition unless the order states otherwise.
C
Bars for machining in one of: (i) hot rolled, as rolled; (ii) hot rolled and normalised; (iii) bright finish (other than cold drawn), as rolled; (iv) bright drawn finished, normalised.
Source: BS 970:1955, Part 2, En 3C (page 41)
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
6
28
-
25
-
-
-
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 3C (page 41)
Heat treatment
Normalise
880/910 C
Temperatures in degrees C as printed.
Source: BS 970:1955, Part 2, En 3C (page 41)
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.