Forging method for petrochemical low-temperature-resistant forged part

The invention discloses a forging method for a petrochemical low-temperature-resistant forged part. The forging method comprises the following steps of S1, smelting, wherein raw materials are smeltedby using an electric furnace and subjected to external refining, and the raw materials include, by mass, 0.06-0.07% of C, 0.25-0.4% of Si, 0.25-0.27% of Mn, 0.013% or below of P, 0.01% or below of S,0.80-1.30% of Cr, 0.25-0.9% of Ni, 0.50-0.80% of Mo, 0.035-0.042% of Nb, 0.01-0.03% of V, 0.50-0.80% of Cu, 0.02-0.05% of Ti, 0.012-0.013% of Al, 1. 00-2.00% of Si and the balance iron and unavoidableimpurities; after smelting is finished, casting is conducted to form ingots. By adding the niobium to the chemical components, the forged part is high in stability and corrosion resistance, and therefore, the forged part can be applicable to be used at low temperature; the corrosion resistance is high, and the forged part is suitable for petrifaction in use; because the price of the niobium is lower than that of tantalum,