Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars (excluding cold drawn bars). Suitable for a tensile range of 28/38 tons/sq in.
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
<=0.30
0.05-0.35
<=1.00
<=0.060
<=0.060
Mechanical Properties
Tensile Strength
432-587 MPa (28-38 tons/sq in, converted)
Elongation
≥25%
Hardness
126-179 HB
Condition
ruling section 6 in (lowest-strength condition of the standard)
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 and bright bars in the finally heat treated condition unless the order states otherwise.
Source: BS 970:1955, Part 2, En 4 (page 44)
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
ruling section 6 in
-
28-38
-
25
-
126-179
-
ruling section 2 1/2 in
-
28-38
-
25
20
126-179
-
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 4 (page 45)
Heat treatment
Normalise
850/900 C
Temperatures in degrees C as printed.
Source: BS 970:1955, Part 2, En 4 (page 44)
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 EN4 Listings on M-EX (For Sale)