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
7.0-10.0
17.0-20.0
<=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
Condition of material on delivery
A
Bars and billets for forging as rolled or forged unless order states otherwise.
B
Forgings and drop-forgings finally heat treated unless order states otherwise.
C
Bars for machining finally heat treated unless order states otherwise.
D
Bright bars finally heat treated, before or after cold work at manufacturer option, unless order states otherwise.
Source: BS 970:1955, Part 2, En 58A (page 171)
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 58A (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 58A (page 171)
Notes
Note
Ni plus Cr not less than 25.0 per cent
Source: BS 970:1955, Part 2, En 58A
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 EN58A Listings on M-EX (For Sale)