Strips cut lengthwise, 1 in. wide, heated uniformly to a low cherry red and cooled in water of about 80° Fahrenheit, must stand bending double in a press to a curve of which the inner radius is one and a half times the thickness of the steel tested.

This steel is also to stand such forge tests, both hot and cold, as may be sufficient in the opinion of the inspector to prove soundness of material and fitness for the work.