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Steel Making

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

Annealing
ANNEALING can be done by heating to temperatures ranging from...

Furnace Data
In order to give definite information concerning furnaces, fu...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

High-chromium Or Rust-proof Steel
High-chromium, or what is called stainless steel containing f...

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

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Tensile Properties
Strength of a metal is usually expressed in the number of pou...

Annealing Of High-speed Steel
For annealing high-speed steel, some makers recommend using g...

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

Nickel
Nickel may be considered as the toughest among the non-rare a...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Annealing
There is no mystery or secret about the proper annealing of d...



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



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