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Heat treatment method for large-sized lathe bed

A heat treatment method and lathe bed technology are applied in the field of ferrous metal production to achieve the effects of simple process, improved mechanical properties and cutting performance

Inactive Publication Date: 2017-07-21
卓健
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And perform high temperature annealing to improve mechanical properties and cutting performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The heat treatment method of a kind of large-scale lathe bed of this example comprises the following several steps:

[0017] The first step: ingredients: steel scrap, recycled materials, pig iron, ferromanganese, ferrosilicon, ferrovanadium, ferrotitanium, pure copper according to C3.3%, Si1.3%, Mn0.5%, V0.16%, Ti0 .1%, Cu0.6%, P0.3%, S≤0.10%, and the balance is Fe weight percentage;

[0018] Step 2: Preheating: Put the optimized calculated steel scrap, recycled material and pig iron into the medium frequency induction furnace for preheating;

[0019] The third step: smelting: After melting the steel scrap, recycled materials, and pig iron in the intermediate frequency induction furnace, put in a deoxidizer whose amount is 18% of the furnace charge, and whose composition is 70% of lime + 30% of fluorite for pre-deoxidation, and then put into baking Treated ferromanganese, ferrosilicon, ferrovanadium, ferrotitanium and pure copper to obtain molten iron;

[0020] Step 4...

Embodiment 2

[0026] The heat treatment method of a kind of large-scale lathe bed of this example comprises the following several steps:

[0027] The first step: ingredients: steel scrap, recycled materials, pig iron, ferromanganese, ferrosilicon, ferrovanadium, ferrotitanium, pure copper according to C3.45%, Si1.65%, Mn0.75%, V0.265%, Ti0 .125%, Cu0.7%, P0.35%, S≤0.10%, and the balance is Fe weight percentage;

[0028] Step 2: Preheating: Put the optimized calculated steel scrap, recycled material and pig iron into the medium frequency induction furnace for preheating;

[0029] The third step: smelting: After melting the steel scrap, returned materials, and pig iron in the intermediate frequency induction furnace, put in a deoxidizer whose amount is 18-26% of the furnace charge, and whose composition is 70% lime + 30% fluorite for pre-deoxidation, and then put in Baking ferromanganese, ferrosilicon, ferrovanadium, ferrotitanium and pure copper to obtain molten iron;

[0030] Step 4: Rapi...

Embodiment 3

[0036] The heat treatment method of a kind of large-scale lathe bed of this example comprises the following several steps:

[0037] The first step: ingredients: steel scrap, recycled materials, pig iron, ferromanganese, ferrosilicon, ferrovanadium, ferrotitanium, pure copper according to C3.6%, Si2.0%, Mn1.0%, V0.37%, Ti0 .15%, Cu0.8%, P0.4%, S≤0.10%, and the balance is the weight percentage of Fe; the second step: preheating: put the optimized calculated scrap steel, recycled materials, and pig iron into the intermediate frequency Preheating in induction furnace;

[0038] The third step: smelting: After melting the steel scrap, recycled material, and pig iron in the intermediate frequency induction furnace, put in a deoxidizer whose amount is 26% of the furnace charge, and whose composition is 70% of lime + 30% of fluorite for pre-deoxidation, and then put into baking Treated ferromanganese, ferrosilicon, ferrovanadium, ferrotitanium and pure copper to obtain molten iron;

...

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Abstract

The invention discloses a heat treatment method for a large-sized lathe bed. The large-sized lathe bed comprises, by weight, 3.3%-3.6% of C, 1.3%-2.0% of Si, 0.5%-1.0% of Mn, 0.16%-0.37% of V, 0.1%-0.15% of Ti, 0.6%-0.8% of Cu, 0.3%-0.4% of P, 0-0.10% of S and the balance Fe. The method includes the steps of burdening, preheating, smelting, fast on-the-spot sample analysis, final deoxidation, inoculation treatment, pouring and high-temperature annealing. The method is simple in technology, and the mechanical property and machinability are improved by controlling the contents of vanadium, titanium and copper in cast iron and by conducting the high-temperature annealing. The abrasive resistance is higher than that of common inoculated cast iron HT200 and HT250 by one to two times. Moreover, the using amount of scrap steel can be reduced, and the heat treatment method is particularly suitable for casting the large-sized lathe bed.

Description

technical field [0001] The invention relates to the technical field of ferrous metal production, in particular to a heat treatment method for a large lathe bed. Background technique [0002] Vanadium-titanium-copper wear-resistant cast iron is an excellent wear-reducing material, which has the characteristics of high hardness and prolonging the service life of castings. The purpose of adding copper is because copper can promote the formation and refinement of the pearlite matrix, thereby improving the strength, hardness and wear resistance of cast iron. The two elements vanadium and titanium in vanadium-titanium wear-resistant cast iron have a great affinity with carbon and nitrogen. Form unique vanadium-titanium carbonitride compounds, these compounds have very high microhardness, as high as 960-1840HV, and are distributed in the matrix structure in the form of fine hard points, which greatly improves the wear-reducing performance of cast iron. Southwest China is rich in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C33/08C21D1/26C21D5/00C21D9/00C21C7/06C21C1/04
CPCC21C1/04C21C7/06C21D1/26C21D5/00C21D9/0068C22C33/08C22C37/10Y02P10/20
Inventor 卓健
Owner 卓健