Machining technology of high-strength high-hardness gray pig iron

Abstract

The invention discloses a machining technology of high-strength high-hardness gray pig iron, and belongs to the technical field of powder metallurgy. Q235 waste steel, Q10 pig iron and foundry returnsserve as raw materials to be subjected to gray pig iron smelting. According to the technology, the manner that when a traditional medium-frequency induction furnace smelts high-grade gray pig iron, alloying elements of copper or tin are added is replaced, manufacturing cost is reduced, and management of foundry returns is facilitated. The method that silicon carbide and furnace burden are smeltedat the same time is adopted to carry out pretreatment on the molten iron, the pretreatment effect is ensured, an efficient nucleating agent, that is a silicon zirconium nucleating agent, is adopted to ensure the nucleating effect, 80% or above of A-type graphite is obtained from a gold phase of a casting body, the tensile strength of the casting body reaches 270 to 300, and the special occasion of high performance, good cutting performance and the like at present can be met.

Description

technical field

[0001] The invention belongs to the technical field of powder metallurgy, and relates to gray cast iron, in particular to a processing technology of high-strength and high-hardness gray cast iron. Background technique

[0002] Cast iron is a general term for alloys mainly composed of iron, carbon and silicon. Cast iron can be divided into: gray cast iron, white cast iron, malleable cast iron, nodular cast iron, vermicular cast iron and alloy cast iron.

[0003] Alloy cast iron is obtained by adding appropriate amount of alloying elements (such as silicon, manganese, phosphorus, nickel, chromium, molybdenum, copper, aluminum, boron, vanadium, tin, etc.) to ordinary cast iron. Alloying elements change the matrix structure of cast iron, so that it has corresponding properties such as heat resistance, wear resistance, corrosion resistance, low temperature resistance or non-magnetic properties. Among them, gray cast iron in alloy cast iron is the most widely use...