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
Ni
Cr
S
P
<=0.16
>=0.20
<=2.00
11.0-14.0
11.0-14.0
<=0.045
<=0.045
Mechanical Properties
Tensile Strength
≥541 MPa (35 tons/sq in, converted)
Yield Strength
≥185 MPa (12 tons/sq in, converted)
Elongation
≥30%
Condition
, ruling section 6 in (lowest-strength condition of the standard)
More data from BS 970:1955
From the standard
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
35
12
30
50
-
-
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 58D (page 171)
Heat treatment
Soften
cooling freely in air or quenching in oil or water (at manufacturer option) from 950/1150 C
Temperatures in degrees C as printed.
Source: BS 970:1955, Part 2, En 58D (page 171)
Notes
Note
The sum of nickel and chromium contents shall be not less than 23.0 per cent. Heat treatment and mechanical properties as for the En 58 series (En 58A to 58M).
Source: BS 970:1955, Part 2, En 58D
Status in the 1955 edition
Status
Deleted by Amendment 6
Reason
Amendment 6 (Feb 1970): stainless, heat resisting and valve steels moved to BS 970 Part 4:1970
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 EN58D Listings on M-EX (For Sale)