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Steel Making

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

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

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

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

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

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Double Annealing
Water annealing consists in heating the piece, allowing it to...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Annealing Work
With the exception of several of the higher types of alloy s...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

The Thermo-couple
With the application of the thermo-couple, the measurement of...

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

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

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

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

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

Process Of Carburizing
Carburizing imparts a shell of high-carbon content to a low-...



Preparing Parts For Local Case-hardening






Category: CASE-HARDENING OR SURFACE-CARBURIZING

At the works of the Dayton Engineering Laboratories Company, Dayton,
Ohio, they have a large quantity of small shafts, Fig. 40, that
are to be case-hardened at A while the ends B and C are to
be left soft. Formerly, the part A was brush-coated with melted
paraffin but, as there were many shafts, this was tedious and great
care was necessary to avoid getting paraffin where it was not wanted.



To insure uniform coating the device shown in Fig. 41 was made.
Melted paraffin is poured in the well A and kept liquid by setting
the device on a hot plate, the paraffin being kept high enough
to touch the bottoms of the rollers. The shaft to be coated is
laid between the rollers with one end against the gage B, when
a turn or two of the crank C will cause it to be evenly coated.





Next: The Penetration Of Carbon

Previous: Preventing Carburizing By Copper-plating



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