This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 Excerpt: ...had been heating them to a somewhat high temperature and allowing them to cool very slowly, with the result that it was no uncommon experience to have to replace two or three in the course of the same day; the average life of a valve was a matter of a very few hours. As usual, the steel maker was blamed; and while it ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 Excerpt: ...had been heating them to a somewhat high temperature and allowing them to cool very slowly, with the result that it was no uncommon experience to have to replace two or three in the course of the same day; the average life of a valve was a matter of a very few hours. As usual, the steel maker was blamed; and while it is true that he sometimes does give us a little trouble, it was again proved that several of the steels which had previously failed were entirely suitable for the purpose when they were properly treated. The method adopted for each of the different steels was simply that of heating to a little above the temperature on the chart corresponding to the carbon of the particular steel; quenching out in oil; reheating to a little below the line PSK, say about 600 C, and again quenching in oil. Since very thin articles of this kind cool somewhat rapidly in the air, modifications of this treatment may be adopted with advantage. Instead of quenching in oil, the valves may be allowed to cool freely in the air, or they may be cooled by placing them between two level metal blocks which may be slightly heated in certain cases: this method has the additional advantage of keeping such thin pieces level. A number of valves were treated according to the above methods, with the gratifying result that at the time of writing they have been continuously at work for a period, not of six hours, but of six months, and are still behaving in every way satisfactorily. While the above treatment is suitable for steel containing up to about 1-2 per cent. carbon, it does not give the best results for steel with from 12 to 1"5 per cent. The only way to obtain the finest and best structure for steel within this range of carbon is to forge and then heattreat it. We have alr...
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Add this copy of The Value of Science in the Smithy and Forge to cart. $42.15, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Owen Press.
Add this copy of The Value of Science in the Smithy and Forge to cart. $63.29, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2022 by Legare Street Press.
