摘要:
Fully killed high-strength low-alloy steels consisting essentially of .12% to .20% carbon, 1.10% to 1.65% manganese, .05% to .20% vanadium, .005% to .025% nitrogen, .04% maximum phosphorus, .025% maximum sulfur, .60% maximum silicon and balance iron are characterized in a hot-rolled finished condition by yield strengths in excess of 80,000 p.s.i., ultimate tensile strengths in excess of 95,000 p.s.i., ductilities as measured by percent elongation (2 inches) in excess of 18% and good toughness. The steels are hot-rolled finished in the temperature range 1550.degree. F. to 1650.degree. F., cooled at a rate within the range 20.degree. F. to 135.degree. F. per second and collected by coiling or piling within a temperature range of 1025.degree. F. to 1175.degree. F. The steels modified by the incorporation of .01% to .10% of a rare earth are further characterized by improved formability.
摘要:
Total bath oxygen content and silicon input are controlled during a steelmaking process so that a cast and subsequently wrought product is characterized by being virtually free of elongated sulfide and silicate inclusions. Bendability properties of the wrought product are enhanced thereby.
摘要:
A ladle desulfurization composition and method are provided in which molten steel to be desulfurized is mixed with a mixture of particulate metallic aluminum, fluorspar and lime to deoxidize and desulfurize the metal and form a fluxed slag.
摘要:
An additive and method of making zirconium additions to steel is provided in which an alloy of about 70% to 90% zirconium and the balance iron with residual impurities is formed into uniform sized pieces and added to a bath of molten steel with various possible techniques.
摘要:
A method of purifying steel in a tundish, especially to remove alumina inclusions, comprises passing the steel through at least one refractory board having apertures through it and introducing inert gas into the steel at the upstream side of the foot of the board to cause a stream of bubbles to flow over the upstream side of the board. One of the boards may comprise a ceramic filter element. The boards may be non-vertical and have integral gas supply means. The apertures may taper, may have axes angled from perpendicular to the board's plane and may have high alumina content surfaces. The upstream side of the board may have an exothermic layer.