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
Cu
S
P
<=0.23
0.05-0.35
>=1.20
<=0.60
<=0.060
<=0.060
Mechanical Properties
Tensile Strength
510-602 MPa (33-39 tons/sq in, converted)
Elongation
≥18%
Condition
Hot rolled or normalised, ruling section 2 1/2 in, 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
A
Bars and billets for forging as rolled or forged unless order states otherwise.
B
Forgings and drop-forgings normalised unless order states otherwise.
C
Bars for machining normalised unless order states otherwise.
Source: BS 970:1955, Part 2, En 14A/1 (page 72)
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
Hot rolled or normalised, ruling section 1 1/8 in
1 1/8
35-41
-
18
-
-
21
Hot rolled or normalised, ruling section 2 1/2 in
2 1/2
33-39
-
18
-
-
19
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 14A/1 (page 73)
Heat treatment
Normalise
860/900 C
Temperatures in degrees C as printed.
Source: BS 970:1955, Part 2, En 14A/1 (page 72)
Notes
Note
Copper optional. Manganese plus residual nickel, chromium and molybdenum shall not exceed 2.0 per cent.
Source: BS 970:1955, Part 2, En 14A/1
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 EN14A/1 Listings on M-EX (For Sale)