Machining process for high-strength nodular cast iron pipe with reduced wall thickness

The invention discloses a machining process for a high-strength nodular cast iron pipe with a reduced wall thickness, and relates to the technical field of nodular cast iron pipe machining. The production process comprises the following steps: carrying out thermal refining on 80-90% of blast furnace molten iron and 10-20% of scrap steel, adding 2.51-3.73 wt% of silicon iron TFeSi75, carrying out primary inoculation treatment, pouring the molten iron with the temperature of 1310-1420 DEG C into a pipe mold to form a pipe blank, carrying out secondary inoculation, carrying out annealing treatment, carrying out metallographic phase, mechanical property and wall thickness detection on the annealed pipe blank, and carrying out secondary inoculation treatment on the annealed pipe blank. And then the nodular cast iron pipe with the tensile strength of 500-597 Mpa is obtained. 本发明公开了一种减薄壁厚的高强度球墨铸铁管加工工艺，涉及球墨铸铁管加工技术领域，生产过程包括将80～90％高炉铁水和10～20％废钢进行调质处理、加入2.51～3.73wt％的硅铁TFeSi75进行第一次孕育处理、将温度为1310～1420℃铁水浇注到管模中形成管坯并进行第二次孕育、