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
Cr
S
P
0.90-1.20
0.10-0.35
0.30-0.75
1.00-1.60
<=0.050
<=0.050
Mechanical Properties
Hardness (HB)
≤229 (softened)
Typical Available Sizes
Round Bar
10mm – 150mm dia
Flat Bar
15×5mm – 100×25mm
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 order states otherwise.
B
Forgings and drop-forgings softened unless order states otherwise.
C
Bars for machining softened unless order states otherwise.
Source: BS 970:1955, Part 2, En 31 (page 118)
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
Softened condition
-
-
-
-
-
<=229
-
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 31 (page 118)
Heat treatment
Harden (oil or water)
800/840 C
Temper
hardened parts may be lightly tempered at 130/180 C; tempering above 200 C may lead to undue loss of hardness
Temperatures in degrees C as printed.
Source: BS 970:1955, Part 2, En 31 (page 118)
Status in the 1955 edition
Status
Deleted by Amendment 7
Reason
Amendment 7 (Sep 1970): direct hardening alloy steels moved to BS 970 Part 2:1970
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.