"Speakin' of fertile soil," said the Kansan, when the others had had their say, "I never saw a place where melons growed like they used to out in my part of the country. The first season I planted 'em I thought my fortune was sure made. Howev... Read more of HYPERBOLE at Free Jokes.caInformational Site Network Informational
Privacy
   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

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

Carbon Steels For Different Tools
All users of tool steels should carefully study the different...

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

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

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

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

The Modern Hardening Room
A hardening room of today means a very different place from ...

The Influence Of Size
The size of the piece influences the physical properties obta...

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

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

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

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

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



Process Of Carburizing






Category: HEAT TREATMENT OF STEEL

Carburizing imparts a shell of high-carbon
content to a low-carbon steel. This produces what might be termed
a dual steel, allowing for an outer shell which when hardened
would withstand wear, and a soft ductile core to produce ductility
and withstand shock. The operation is carried out by packing the
work to be carburized in boxes with a material rich in carbon and
maintaining the box so charged at a temperature in excess of the
highest critical point for a length of time to produce the desired
depth of carburized zone. Generally maintaining the temperature
at 1,650 to 1,700 deg. F. for 7 hr. will produce a carburized zone
1/32 in. deep.

Heating to a temperature slightly above the highest critical point
and cooling suddenly in some quenching medium, such as water or oil
hardens the steel. This treatment produces a maximum refinement
with the maximum strength.

Drawing to a temperature below the highest critical point (the
temperature being governed by the results required) relieves the
hardening strains set up by quenching, as well as the reducing
of the hardness and brittleness of hardened steel.





Next: Effects Of Proper Annealing

Previous: Annealing Work



Add to del.icio.us Add to Reddit Add to Digg Add to Del.icio.us Add to Google Add to Twitter Add to Stumble Upon
Add to Informational Site Network
Report
Privacy
SHAREADD TO EBOOK


Viewed 5258