A-A-1041B
Physical characteristics (other than shape) and hardness shall conform with and be examined in accordance with Steel Founders’
Society of America Standard Specification for Cast Steel
Abrasives SFSA Designation: 20-66, Reprinted 1980. The applicable portions of SFSA 20-66 are paragraphs 4.3 through 6.3 and 7.3 through 7.5.3.1 which are applicable to steel grit. Hardness shall be determined using a micro-hardness tester, measuring the Knoop Hardness number in accordance with ASTM Standard Test Methods and Definitions for Mechanical Testing Testing of Steel Products, ASTM A370, utilizing a 500 gf load and converting the value obtained to the Rockwell C scale Density of the grit shall be not less than 7.0 gm per cc and shall be determined by the displacement method described in the Society of Automotive Engineers Recommended Practice ‘Cast Steel Shot - 3827’.
4. The chemical composition of the cast steel grit shall conform with the following limitations and shall be determined in accordance with American Society for Testing and Materials Standard Methods for Chemical Analysis of Carbon Steel, Low-alloy Steel, Silicon Electrical, Ingot Iron, and Wrought Iron, ASTM E350.
|
CARBON |
1.20%, maximum |
|
MANGANESE |
1.20%, maximum |
|
PHOSPORUS |
0.05%, maximum |
|
SULFUR |
0.05%, maximum |
|
SILICA |
1.50%, maximum |
SILICA SHALL NOT BE PRESENT IN THE FREE FORM AND PRESENT A HEALTH HAZARD DUE TO SILICOSIS.
5. The grit shall meet or exceed the durability requirements shown in Table I below:
TABLE I
|
Grit Size |
Minimum Durability Cycles to Complete Breakdown (see notes) |
Take-out Screen Size |
|
G14 |
2225 |
40 mesh |
|
G16 |
2325 |
40 mesh |
|
G18 |
2400 |
40 mesh |
|
*G25 |
2975 |
50 mesh |
|
*G40 |
2950 |
50 mesh |
|
*G50 |
2375 |
70 mesh |
|
*G80 |
2300 |
70 mesh |
Notes:
1/ Durability shall be tested in accordance with the Complete Breakdown method of Society of Automotive Engineers information Report, Metallic Shot and Grit Mechanical Testing, SAE J445.
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