MIL-S-851D
3.3.1 Grit. Type I and Type II grit shall consist entirely of angular particles produced by crushing cast iron or heat treated cast steel, and shall be free as far as practicable from rounded particles.
3.3.2.1 Cast steel or cast iron shot shall be spherical in shape and free as far as practical from elongated and angular particles.
3.3.3 Shot. Type III
3.3.3.1 Cut steel wire shot shall be free from dust, grit, oil, grease, wire-drawing lubricants or other contaminants. The shot shall be free from shear cracks and laps, shall not contain excessive seams or burrs, and shall be preused or otherwise conditioned to eliminate sharp edges and shall form ball shaped shot. Some partially conditioned shot shall be acceptable provided the edges are rounded and the weight of 50 pieces or length of 10 pieces meet the limits of Table IV.
3.4 Hardness.
3.4.1 Grit and shot, Type I. Unless otherwise specified in procurement documents, cast steel grit and shot shall have a hardness range equivalent of Rockwell C-42 to C-52.
3.4.2 Grit and shot, Type II. Unless otherwise specified in procurement documents, cast-iron grit and shot shall have a hardness ranging from 240 to 840 Vickers Pyramid numbers or Rockwell hardness equivalent numbers C-20 to C-65. This hardness may be obtained, if necessary, by heat treatment. Such heat treated material may be ordered to a specified hardness range of about 120 Vickers Pyramid hardness numbers.
3.4.2 Cut steel wire shot, Type III. Cut steel wire shot shall have the following hardness:
Shot Size
Minimum hardness
Rockwell "C"
CW-62 36
CW-54 39
CW-47 41
CW-41 42
CW-35 44
CW-32 45
CW-28 46
CW-23 and finer 48
3.5 Microstructure. The microstructure of cast steel material shall consist of uniformly tempered martensite with fine, well distributed carbides. Any microstructure sample for cast steel shot shall exhibit no more than 15% particles containing cracks or draws. A crack is linear discontinuity with length greater than three times the width and length greater than 25% of the shot diameter. A draw is a recess in the shot surface which may be rounded but extends into the shot more than 25% of the shot diameter.
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