| Have about half the deck in both hands, have the spectator replace the chosen card on top of the left hand stock. Place the right hand stock on top, or dribble on top such as to cover the pinky break you will catch above the spectator's card. Square ... Read more of Double Undercut at Card Trick.ca |  InformationalPrivacy |
Steel MakingCorrection By Zero AdjustmentMany pyrometers are supplied with a zero adjuster, by means ... Double Annealing Water annealing consists in heating the piece, allowing it to... Air-hardening Steels These steels are recommended for boring, turning and planing... Flange Shields For Furnaces Such portable flame shields as the one illustrated in Fig. 1... High-chromium Or Rust-proof Steel High-chromium, or what is called stainless steel containing f... Steel For Chisels And Punches The highest grades of carbon or tempering steels are to be re... Testing And Inspection Of Heat Treatment The hard parts of the gear must be so hard that a new mill f... Quenching It is considered good practice to quench alloy steels from th... Carbon Steels For Different Tools All users of tool steels should carefully study the different... Carburizing Low-carbon Sleeves Low-carbon sleeves are carburized and pushed on malleable-ir... Instructions For Working High-speed Steel Owing to the wide variations in the composition of high-speed... Quality And Structure The quality of high-speed steel is dependent to a very great ... Gears The material used for all gears on the Liberty engine was sel... Carbon-steel Forgings Low-stressed, carbon-steel forgings include such parts as car... Chromium Chromium when alloyed with steel, has the characteristic func... Steel Worked In Austenitic State As a general rule steel should be worked when it is in the a... An Automatic Temperature Control Pyrometer Automatic temperature control instruments are similar to the ... Surface Carburizing Carburizing, commonly called case-hardening, is the art of pr... Hardening The forgings can be hardened by cooling in still air or quen... Leeds And Northrup Optical Pyrometer The principles of this very popular method of measuring tempe... |
SulphurCategory: COMPOSITION AND PROPERTIES OF STEEL SULPHUR is another element (symbol S) which is always found in steel in small quantities. Some sulphur is contained in the ore from which the iron is smelted; more sulphur is introduced by the coke and fuel used. Sulphur is very difficult to get rid of in steel making; in fact the resulting metal usually contains a little more than the raw materials used. Only the electric furnace is able to produce the necessary heat and slags required to eliminate sulphur, and as a matter of fact the sulphur does not go until several other impurities have been eliminated. Consequently, an electric steel with extremely low sulphur (0.02 per cent) is by that same token a well-made metal. Sulphur is of most trouble to rolling and forging operations when conducted at a red heat. It makes steel tender and brittle at that temperature--a condition known to the workmen as red-short. It seems to have little or no effect upon the physical properties of cold steel--at least as revealed by the ordinary testing machines--consequently many specifications do not set any limit on sulphur, resting on the idea that if sulphur is low enough not to cause trouble to the manufacturer during rolling, it will not cause the user any trouble. Tool steel and other fine steels should be very low in sulphur, preferably not higher than 0.03 per cent. Higher sulphur steels (0.06 per cent, and even up to 0.10 per cent) have given very good service for machine parts, but in general a high sulphur steel is a suspicious steel. Screw stock is purposely made with up to 0.12 per cent sulphur and a like amount of phosphorus so it will cut freely. Manganese counteracts the detrimental effect of sulphur when present in the steel to an amount at least five times the sulphur content. Next: Phosphorus Previous: Composition And Properties Of Steel
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