Introduction to Basic Manufacturing Processes and ... - always yours

74 Introduction to Basic Manufacturing Processes and Workshop Technology
(7) Patented p
(8) Hardened and Tempered q
(9) Stress relieved s
(10) Tempered t
Steel Quality
Following symbols should be recommended to be suffixed with the normal steel symbol
to indicate the steel quality
(1) Non-ageing quality A
(2) Stabilizing against stress corrosion and inter-annular attack E
(3) Control cooled ensure freedom from flakes L
(4) Fully-killed (deoxidized) D
(5) Semi-killed D2
(6) Rimming quality R
(7) Grain size controlled G
(8) Hardenability controlled H
(9) Inclusion controlled I
(10) Structural homogeneity guaranteed by macro- structure test M
Carbon Tool Steel (Annealed)
Carbon tool steel in annealed condition is explained as below with designation and uses.
C-60 Spindles for machine tools, coupling, crank shaft axles and pinions.
C-65 Small washers and thin stamped parts.
C- 70 Buffer spring shock absorbers.
C- 75 Light flat, springs formed from annealed stock.
C-75-C-85 Flat and coils springs for automobiles and railway vehicles.
C-50 to C-113 Springs made from small flat section.
Plain Carbon Structural Steel
Designation and Uses
St-42
For bridge and building construction, railway rolling stock, screw
spikes and oil well castings.
St-44
Pressure vessels, fasteners, value fittings for compressed gas cylinders
and railway rolling stock.
St-47
For railway rolling stock, pressure parts of marine and land boilers
and rivets for air receivers.
St-50
For mines, forgings of marine and engine parts.
St-52-54
For railway wheels, electric tramways cars.