Metallurgy Of Cast Iron

I36
METALLURGY OF CAST IRON.
merited upon in the Iron Age, November 30, 1895. He states his conclusions as follows: "There is often a slight variation in the amount of phosphorus and manganese in the different grades formed in the same 'cast,''but so far, no regular occurring progression variation has been observed. At best, the difference is only a few hundredths of one per cent.'' The author could present several more tables showing uneven distribution of silicon, etc., but those shown are sufficient to illustrate the necessity for reform in the lines advocated by the author.
When the founder considers that a difference of one-
TABLE 2O.—SILICON ANALYSES OF EIGHT CASTS.
Test of pig" iron. ist bed. I •s 1 4th bed. i> & 5 iO 1 6 5 T3 <L> & a
i cast. ...................... I-I3 i 15 1.15 I.IQ 1.^7 1.40 I A2
2 cast ............. j 38 1.44 i 45 I 60 I 63 j 72 I 7Q
3 cast ......................... 1.15 1.34 1.43 1.57 2 17 2.18 2 2D
4 cast. ................. I 29 i 50 i 54 i 66 I 82 i 84 I 88
5 cast ........................ I-95 2.09 2.13 2.45 2 70 2 J-2 2 76
6 cast .......... i 81 i 83 i 84 i 86 I 80 2 l6
7 cast ............... 2.72 2.74 2.77 2.79 2.85 2 88 2 SO
8 cast ......................... 2.46 2.48 2.50 2.53 2.54 2.58 2 60

quarter of one per cent, in silicon and a few hundredths of one per cent, in sulphur will seriously alter the "grade" of his mixture so as to either make his "cast" too soft or too hard, and may often cause him great trouble or loss in the castings produced, he should at once perceive that the uneven distribution of silicon and sulphur which occurs more or less in every "cast" of a furnace is a quality seriously 'affecting his interests. Especially is this so, when he is aware that the one analysis which may be given is simply an average of the whole, generally taken from the two ends andith the uncertainty of furnace workings when in urgent need of ten hundred jon of iron; and Sir........................ 2,720 "