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1. • CommentAuthorwalter
   • CommentTimeJan 22nd 2007

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   Sulfur in steel is considered injurious except when added to enhance machinability. Sulfur readilly combines with iron to form a low melting iron sulphide. Sulfur causes hot shortness in steel unless sufficient manganese is added. Sulfur has a greater affinity for manganese than iron and forms manganese sulphide which has a meltin point above the hot rolling temperature of steel, which eliminates hot shortness. By hot shortness we mean that the steel will literally break apart during hot rolling resulting in a scrapped product.
   
   Sulfur is extremely harmful in steels that will be in service at low temperatures due to a severe reduction in notch toughness or the ability to wirhstand a sudden or impact load.The Titanic sunk because the hull ppppplates and rivets became brittlein the cold north atlantic waters. It is recommended thar sulfur be kept below 0.005 weight percent in steel for any low temperature applications such as bridges, truck and trailor frames, tubular products etc.
   
   The low sulfur level mentioned above is achievable in the Basic Oxygen Process by controlling the sulfur level in the hot metal and in the scrap. Ladle treatments of calcium carbide or other compounds can be used to reduce sulfur to very low levels by plunging the addition below the surface of the metal in the ladle.
   
   In the Electric Furnace Process, There is the opportunity to remove csulfur by multiple slag treatments. The sulfur isremoved from the bath as calcium sulphite usually after multiple carbidic slags.
   
   We welcome your thoughta on the control of sulfur.
2. • CommentAuthorfrancescamusso
   • CommentTimeOct 6th 2007

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   I am a manufacturing enginner and Ive been struggling with machining problems of a low sulfur steel especially in hole drilling.
   Do you please have any advice on how to improve the situation?