Forming process for partial thin-wall gray iron casting

The invention discloses a partial thin-wall gray iron casting forming process. The partial thin-wall gray iron casting forming process comprises the following steps that S1, quantitative proportioning of materials is conducted; s2, primary smelting; s3, performing primary analysis; s4, secondary smelting is conducted; s5, carrying out secondary analysis; and S6, carrying out stream inoculation casting to obtain the partial thin-wall gray iron casting. According to the method, firstly, molten iron sulfurizing treatment is carried out, the inoculation effect is improved, the graphite form is improved, the sulfur content of the molten iron is guaranteed to be 0.045%-0.065%, the manganese-sulfur ratio is guaranteed, the graphite form is stabilized, meanwhile, the chilling tendency of the thin-wall casting is reduced by replacing a zirconium inoculant with a strontium inoculant, and cementite is prevented from appearing on the thin-wall part; and finally, by arranging a transverse pouring gate and an inner pouring