1. * GB780007 (A)
Description: GB780007 (A) ? 1957-07-31
Improvements in or relating to cobalt-iron-chromium alloys
Description of GB780007 (A)
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PATENT SPECIFICATION
Inventors: GEOFFREY THOMAS HARRIS and HENRY CAVE CHILD 780,007 Date of
filing Complete Specification: April 19, 1955.
Application Date: Jan. 19, 1954.
No. 1584/54.
Complete Specification Published: July 31, 1957.
Index at acceptance:-Classes 72, AllE; and 82(1), A(1C: 2A), A8(A1:
A2: A3: D: H: J: M: Q:
U: W: Y: Z2: Z4: Z5: Z8: Z12).
International Classification:-C21d. C22c.
COMPLETE SPECIFICATION
Improvements in or relating to Cobalt-Iron-Chromium Alloys We, WILLIAM
JESSOP AND SONS, LIMITED, of Brightside Works, Sheffield, in the
County of York, a British Company, do hereby declare the invention,
for which we pray that a patent may be granted to us, and the method
by which it U to be performed, to, be particularly described in and by
the following statement:-
This invention relates to, heat-resisting alloys of the kind having a
cobalt-ironchromium base and its object is to provide alloys of this
kind from which wrought materials will have improved heat-resisting
properties.
The invention is based upon the observation that heat-resisting alloys

2. of the kind referred to are improved by the addition of larger
quantities than hitherto of strengthening additions of carbon and
carbide-forming elements or other strengtheners.
According to this invention alloys comprise the following, the
percentages being by weight.
Carbon 0.2-0.6% Manganese 0.5-1.5% Silicon 0.3-0.6 % Cobalt 45-70%
Chromium 15-22 % Tungsten 2-6 % Molybdenum 2-6 % Niobium and/or
Tantalum 1-6% Boron 0-0.05 % ' Nitrogen 0--.1% Balance, if any, iron
except for the usual impurities.
In addition there may be present in the above-mentioned range up to
1%' of Cerium and up to 1% total of one or more special deoxidising
additions of Aluminium, Beryllium, Titanium, Vanadium, Calcium and
Magnesium.
Examples of alloys according to the invention are:Wex. 622. Wex. 623.
Wex. 606.
L. 1369 L. 1370. L. 1225.
Carbon Manganese Silicon Cobalt Chromium Tungsten Molybdenum Tantalum
Niobium Boron Cerium Iron and Impurities 0.3 1.0 0.3 0.5 1.0 0.3 0.26
0.45 0.45 0.34 1.2 0.4 1.2 1.5 1.0 0.4 0.4 0.3 65.0 58.0 65.0 65.0
62.0 66,5 20. 20. 20. 20.4 20.5 19.7 3. 5. 3. 3.5 4.1 3.2 3. 5. 3.3
1.5 1.5 2.5 2.5 1.3 1.4 0.03 0.03 0.03 0.05 0.05 Bal.
Bal.
3.1 3.9 2.7 1.9 2.9 1.5 1.9 2.7 1.5 - - 0.001 Bal. Bal. Bal. Bal.
[Pnct 3s. 6d.] The following are properties of alloys made according
to the above-mentioned examples:
(2) (1) (1) (2) (1) (1) (1) Life at Wex 622 Wex 623 Wex 606 Wex 606
L.1369 L.1370 L.1225 4 r/sq.
nn. at 950 C 750 359 270 530 319 746 340 (1) Heat Treatment (Oil
Quench) 12805 C.
(2),,, (Oil Quench) 12805 C. and warm worked 5% at 700 C.
Alloys according to the invention may advantageously be solution
treated at a high temperature in the region 1150-13005 C., after which
treatment some of them may be further improved by warm working at
5009000 C. Warm working is a controlled process whereby a specific
amount of forging reduction Carbon Manganese Silicon Cobalt Chromium
Tungsten Molybdenum Niobium and/or Tantalum Boron Nitrogen (generally
3-15% in thickness) is given at a controlled temperature in the range
500900 C.
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