. Electric railway journal . s possible that the time required to remove them fromthe annealing oven to the quenching tank may be suffi-cient to allow the temperature to drop to a value atwhich the quenching process makes them somewhatbrittle. Depending on the size and character of the castings,which may vary in thickness up to 5% in-, it requiresfrom four to twenty-four hours to accomplish theannealing properly. Even with the most careful an-nealing, however, it is impossible to eliminate the ef-fect of segregation at intersecting flangeways of solidmanganese-steel crossings. Internal stresse
. Electric railway journal . s possible that the time required to remove them fromthe annealing oven to the quenching tank may be suffi-cient to allow the temperature to drop to a value atwhich the quenching process makes them somewhatbrittle. Depending on the size and character of the castings,which may vary in thickness up to 5% in-, it requiresfrom four to twenty-four hours to accomplish theannealing properly. Even with the most careful an-nealing, however, it is impossible to eliminate the ef-fect of segregation at intersecting flangeways of solidmanganese-steel crossings. Internal stresses and blow-holes may also occur at these critical points, thus lower-ing the elastic limit of the material. The physical characteristics of good quality man-ganese steel are similar to those of any high-gradesteel, its elastic limit being approximately 58,000 square inch, the tensile strength, approximately92,000 lb., the per cent elongation in 2 in., , and theper cent reduction of area, In the early stages.
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