Abstract: A steel wire, and a method for producing the same, for use in the manufacture of a chassis or suspension automotive spring having a high sag resistance. In accordance with the invention, after a heat treatment is effected, strain is imposed to the steel wire so as to thereby improve the sag resistance. The strain may be imposed either during tempering or at room temperature following tempering.

Abstract: A wire incrusted with abrasive grains characterized in that it is produced by preparing a cylindrical metallic body having a metallic rod inserted into the central part of a metallic pipe with a gap formed between the rod and the pipe, then filling the gap with mixed powder comprising metallic powder and abrasive grains having a Mohs hardness of 6 or more, and after that, applying hot working and cold working to the cylindrical metallic body before removing the above-mentioned outermost metallic pipe.

Abstract: A large diameter high strength hot rolled steel bar consisting of a low alloy steel having a carbon content of 0.3 to 0.9% and a metallurgical structure with a interlammelar spacing of 0.05 to 0.15 .mu.m, and having a diameter of at least 20 mm, a tensile strength of at least 120 kg/mm.sup.2 and a reduction of area of at least 20% is produced by a process comprising cooling a hot rolled steel bar at a constant rate, characterized by carrying out the cooling in such a controlled manner that the perlite transformation is started at a temperature of ranging from Tc to (Tc+40.degree. C.) wherein Tc is the critical temperature at which a cooling curve at a constant rate is tangent to the perlite transformation starting line of the continuous cooling transformation curve and the maximum temperature during the transformation is suppressed to at most (Tc+80.degree. C.).