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Machineability
Reheating for machine ability was done at 100 deg. less than ...

Air-hardening Steels
These steels are recommended for boring, turning and planing...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

The Effect Of Tempering On Water-quenched Gages
The following information has been supplied by Automatic and ...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Impact Tests
Impact tests are of considerable importance as an indication ...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

Affinity Of Nickel Steel For Carbon
The carbon- and nickel-steel gears are carburized separately...

Manganese
Manganese adds considerably to the tensile strength of steel,...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...



Classifications Of Steel






Category: COMPOSITION AND PROPERTIES OF STEEL

Among makers and sellers, carbon tool-steels are classed by grade
and temper. The word grade is qualified by many adjectives of
more or less cryptic meaning, but in general they aim to denote
the process and care with which the steel is made.

Temper of a steel refers to the carbon content. This should preferably
be noted by points, as just explained; but unfortunately, a 53-point
steel (containing 0.53 per cent carbon) may locally be called something
like No. 3 temper.

A widely used method of classifying steels was originated by the
Society of Automotive Engineers. Each specification is represented
by a number of 4 digits, the first figure indicating the class, the
second figure the approximate percentage of predominant alloying
element, and the last two the average carbon content in points.
Plain carbon steels are class 1, nickel steels are class 2,
nickel-chromium steels are class 3, chromium steels are class 5,
chromium-vanadium steels are class 6, and silico-manganese steels
are class 9. Thus by this system, steel 2340 would be a 3 per cent
nickel steel with 0.40 per cent carbon; or steel 1025 would be a
0.25 plain carbon steel.

Steel makers have no uniform classification for the various kinds
of steel or steels used for different purposes. The following list
shows the names used by some of the well-known makers:

Air-hardening steel Chrome-vanadium steel
Alloy steel Circular saw plates
Automobile steel Coal auger steel
Awl steel Coal mining pick or cutter steel
Axe and hatchet steel Coal wedge steel
Band knife steel Cone steel
Band saw steel Crucible cast steel
Butcher saw steel Crucible machinery steel
Chisel steel Cutlery steel
Chrome-nickel steel Drawing die steel (Wortle)

Drill rod steel Patent, bush or hammer steel
Facing and welding steel Pick steel
Fork steel Pivot steel
Gin saw steel Plane bit steel
Granite wedge steel Quarry steel
Gun barrel steel Razor steel
Hack saw steel Roll turning steel
High-speed tool steel Saw steel
Hot-rolled sheet steel Scythe steel
Lathe spindle steel Shear knife steel
Lawn mower knife steel Silico-manganese steel
Machine knife steel Spindle steel
Magnet steel Spring steel
Mining drill steel Tool holder steel
Nail die shapes Vanadium tool steel
Nickel-chrome steel Vanadium-chrome steel
Paper knife steel Wortle steel

Passing to the tonnage specifications, the following table from
Tiemann's excellent pocket book on Iron and Steel, will give
an approximate idea of the ordinary designations now in use:

Approximate
Grades carbon range Common uses

Extra soft 0.08-0.18 Pipe, chain and other welding purposes;
(dead soft) case-hardening purposes; rivets; pressing
and stamping purposes.
Structural (soft) 0.15-0.25 Structural plates, shapes and bars for
(medium) bridges, buildings, cars, locomotives;
boiler (flange) steel; drop forgings; bolts.
Medium 0.20-0.35 Structural purposes (ships); shafting;
automobile parts; drop forgings.
Medium hard 0.35-0.60 Locomotive and similar large forgings; car
axles; rails.
Hard 0.60-0.85 Wrought steel wheels for steam and electric
railway service; locomotive tires; rails;
tools, such as sledges, hammers, pick points,
crowbars, etc.
Spring 0.85-1.05 Automobile and other vehicle springs; tools,
such as hot and cold chisels, rock drills
and shear blades.
Spring 0.90-1.15 Railway springs; general machine shop tools.





Next: Composition And Properties Of Steel

Previous: The Electric Process



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