Production method of nickel-based GH4080A alloy wire rod

Abstract

The invention belongs to the technical field of machining and manufacturing of special alloy materials, and particularly relates to a production method of a nickel-based GH4080A alloy wire rod. The production method comprises the following steps of material preparing, vacuum induction smelting, electroslag remelting, heat treatment, forging cogging, billet trimming and grinding, heat treatment, wire rolling, on-line solid solution and finishing. According to the production method of the nickel-based GH4080A alloy wire rod, a vacuum induction melting furnace and electroslag remelting furnace smelting technique is used for obtaining electroslag ingots, the electroslag remelting adopts an appropriate slag system proportion and a smelting argon protection method, which can effectively solve the burning loss problem of easy-to-oxidize elements of Al and Ti in the materials, and remarkably improve the purity of the materials; the Al and Ti retention rate of an induction electrode is increased to more than 96% from about 80% in the past; the material performance is improved; the qualified rate of finished products is high; the cost of raw materials is less; the production process is easyto control; the high-temperature performance is good; the surface forming is good; the yield is high; the grinding weight loss is less; and the controllability is good.

Description

technical field [0001] The invention belongs to the technical field of processing and manufacturing special alloy materials, and in particular relates to a production method of a nickel-based GH4080A alloy wire rod. Background technique [0002] In recent years, with the development of internal combustion engines in the direction of high power, low energy consumption, long life, and low cost, higher requirements have been put forward for valve materials, especially exhaust valve materials, which require good high-temperature mechanical properties, high-temperature resistance Oxidation, corrosion resistance, wear resistance, structural stability and good processing performance. [0003] The chemical composition of GH4080A is stipulated in the national standard GB / T 12773-2008 "Steel and Composite Bars for Internal Combustion Engine Valves" as follows: C%: 0.04-0.10, Si%≤1.0, Mn%≤1.00, P%≤0.020, S %≤0.015, Cr%:18.00-21.00, Cu%≤0.20, Al%:1.00~1.80, Ti%:1.80-2.70, Fe%≤3.00, Co%...

AI Technical Summary

Problems solved by technology

[0004] Due to the high content of alloy elements, high Al and high Ti, the thermal processing temperature range of the material is small, the whole production is difficult, the surface quality of the electroslag ingot and the vacuum induction rod are relatively poor, the center hole is very deep, the yield is low, and the segregation Seriously, if the thermal processing process is not properly controlled, defects such as cracks (surface cracks, corner cracks) will easily occur, resulting in product scrapping, electroslag ingots and vacuum induction rods are likely to fail to meet the standards, and the input of raw materials is large and the cost is high.

At present, there are only a few producers of this material wire rod in China, and the product yield is low, the cost is high, the weight of the coil is small, and the quality is not stable.

Due to the characteristics of the GH4080A material itself, only small coils with small coil weights can be produced on the market at present, making the production process as controllable as possible. The greater the coil weight, the more difficult it is to manufacture, and the process deformation is difficult to control. Poor controllability, lower yield

Therefore, it is difficult to supply large quantities to the market and cannot meet the domestic demand for high-end valve steel

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