Of course, this also tends to insure uniformity in the case-hardening operation.

It was that case-hardening experience which had worked the callous metamorphosis.

Plain water, salt water and linseed oil are the three most common quenching materials for case-hardening.

The quenching tank is an important feature of apparatus in case-hardening-possiblymore so than in ordinary tempering.

Good case-hardening pots and annealing tubes can be made from the desired size of wrought iron pipe.

Nickel steel has remarkably good mechanical qualities when suitably heat-treated, and it is preeminently adapted for case-hardening.

The snow lost its icy case-hardening.

Machined or forged steel parts are packed with case-hardening material in metal boxes and subjected to a red heat.

He was vain of me, fond of having me with him, and, as he called it, of case-hardening me.

This gives an appearance similar to case-hardening, the refining effect of the blows reaching but a short distance from the surface.

Pack the work the same as for case-hardening except that it is not necessary to keep the pieces away from each other.

All she required was the case-hardening of the world, which would leave an iron surface upon which the dog trains could travel.

There are also other methods of preventing case-hardening, one being to paint the surface with a special compound prepared for this purpose.

Good results are obtained by packing the steel in iron boxes or tubes, much as for case-hardening or carbonizing, using the same materials.

Nickel steels having 3½ per cent nickel and 0.15 to 0.20 per cent carbon are excellent for case-hardening purposes, giving hard surfaces and tough interiors.

The Management of Steel, including Forging, Hardening, Tempering, Annealing, Shrinking, and Expansion; also the Case-Hardening of Iron.