The following steel specifications are considered standard by the Society of Automotive Engineers and represents automobile practice in this country. These tables give the S. A. E. number, the composition of the steel and the heat treatment. These are referred to by letter--the heat treatments being given in detail on pages 134 to 137 in Chap. 8. It should be noted that the percentage of the different ingredients desired is the mean, or halfway between the minimum and maximum. TABLE 4.--CARBON STEELS ------------------------------------------------------------------------------ S. A. E. | Carbon | Manganese | | | Specification|(minimum and |(minimum and |Phosphorus| Sulphur | Heat no. | maximum) | maximum) |(maximum) |(maximum)| treatment -------------|-------------|-------------|----------|---------|--------------- 1,010 | 0.05 to 0.15| 0.30 to 0.60| 0.045 | 0.05 |Quench at 1,500 1,020 | 0.15 to 0.25| 0.30 to 0.60| 0.045 | 0.05 | A or B 1,025 | 0.20 to 0.30| 0.50 to 0.80| 0.045 | 0.05 | H | | | | | 1,035 | 0.30 to 0.40| 0.50 to 0.80| 0.045 | 0.05 | H, D or E 1,045 | 0.40 to 0.50| 0.50 to 0.80| 0.045 | 0.05 | H, D or E 1,095 | 0.90 to 1.05| 0.25 to 0.50| 0.040 | 0.05 | F ------------------------------------------------------------------------------ TABLE 5.--SCREW STOCK --------------------------------------------------------------------------- S. A. E. | Carbon | Manganese | Phosphorus | Sulphur Specification no.| | | (maximum) | -----------------|--------------|--------------|------------|-------------- 1,114 | 0.08 to 0.20 | 0.30 to 0.80 | 0.12 | 0.06 to 0.12 ---------------------------------------------------------------------------