| 摘要 |
<p>The present invention relates to a method of alloying cast steel with sulphur in a sand mold for making the high sulphur cast steel, and to produce High Sulphur Cast Steel, the antifriction and wear resistance material that has high impact value and doesn't include any expensive alloying elements. To be concrete, the invention relates to a method of alloying cast steel with sulphur in a reaction chamber which is set up at the bottom of the spout in a sand mold. Some amount of sulphur is put in the reaction chamber and it is covered with the chips of cast iron. (Fig.2) In case of applying the present method, 92 to 98% of sulphur is absorbed into cast steel. As regards the high sulphur cast steel made by the method according to the invention, the chemical composition is C 0.14 to 0.38%, Si 0.17 to 0.37%, Mn 0.1 to 0.5%, P 0.03% or less and S 0.5 to 3.8% at weight ratio, the tensile strength is 340 to 470MPa, the elongation percentage is 8 to 15%, the impact value is 0.20 to 0.30MJ/m2, the hardness is 105 to 150HB, the coefficient of friction is 0.006 to 0.009 and the abrasive quantity is 1/7 to 1/10 of copper alloy. The method according to the present invention is applicable to the production of the high sulphur cast steel which is used instead of copper alloy for making sliding bearing, angle screw, worm gear, slider, etc. working in lubricating oil on the condition with the maximum permissible pressure [P], 8.5MPa, the maximum permissible linear velocity [V], 18.23m/s, and the permissible [PV], 18MPa·m/s. In addition, the method according to the present invention is also applicable to making all the High Sulphur Cast Steel including antifriction and wear-resistance steel and free cutting steel that contain some sulphur. The method according to the present invention does not cause environment pollution and pollution of furnace and it is easy to adjust the proper content of sulphur correctly.</p> |
