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Scraper of CuNiMo alloying isothermal quenching ductile iron scraper conveyor and preparation method

A technology for isothermal quenching ductile iron and scraper conveyor, which is applied in the direction of conveyor, transportation and packaging, process efficiency improvement, etc., can solve the problems of increasing the cost of mining per ton of coal, increasing the production cost of scraper, and reducing the life of the scraper. , to achieve the effect of lightening the load, reducing energy consumption and long service life

Inactive Publication Date: 2009-12-16
宣化冶金工业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently forged scrapers require large-scale forging equipment, which requires a large investment and greatly increases the production cost of scrapers
At the same time, the hardened layer at both ends of the scraper is only about 5mm. After being worn off, the service life of the scraper will drop sharply, which also greatly increases the mining cost per ton of coal.

Method used

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  • Scraper of CuNiMo alloying isothermal quenching ductile iron scraper conveyor and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A CuNiMo alloyed austempering ductile iron scraper conveyor scraper, the scraper raw material is austempering nodular cast iron, which includes the following chemical composition in weight percentage:

[0037] C 3.60, Si 2.20, Mn<0.3, P<0.03,

[0038] S <0.02, Mg 0.035, Re 0.01, Cu 0.40,

[0039] Ni 0.40, Mo 0.20, and the rest are iron.

[0040] A method for preparing a CuNiMo alloyed austempering nodular cast iron scraper conveyor scraper, comprising the following steps:

[0041] 1) CuNiMo alloying is used to produce nodular cast iron: low-carbon scrap steel is added with carburant charge, and nodular cast iron hot metal is melted in an induction furnace. The chemical composition of the nodular cast iron raw hot metal is (wt%):

[0042] C 3.40, Si 1.40, Mn<0.3, P<0.03, S<0.02,

[0043] Cu 0.40, Ni 0.40, Mo 0.20, the rest is iron;

[0044] 2) Spheroidizing nodular cast iron by pouring into the cover: the so-called spheroidizing treatment by pouring into the cover, t...

Embodiment 2

[0059]A CuNiMo alloyed austempering ductile iron scraper conveyor scraper, the scraper raw material is austempering nodular cast iron, which includes the following chemical composition in weight percentage:

[0060] C 3.80, Si 2.80, Mn<0.3, P<0.03, S<0.02, Mg 0.055,

[0061] Re 0.02, Cu 0.80, Ni 0.80, Mo 0.40, and the rest are iron.

[0062] A method for preparing a CuNiMo alloyed austempering nodular cast iron scraper conveyor scraper, comprising the following steps:

[0063] 1) CuNiMo alloying is used to produce nodular cast iron: low-carbon scrap steel is added with carburant charge, and nodular cast iron hot metal is melted in an induction furnace. The chemical composition of the nodular cast iron raw hot metal is (wt%):

[0064] C 3.80, Si 1.80, Mn<0.3, P<0.03, S<0.02,

[0065] Cu 0.80, Ni 0.80, Mo 0.40, the rest is iron;

[0066] 2) Spheroidizing nodular cast iron by pouring into the cover: the so-called spheroidizing treatment by pouring into the cover, that is, sphe...

Embodiment 3

[0080] A CuNiMo alloyed austempering ductile iron scraper conveyor scraper, the scraper raw material is austempering nodular cast iron, which includes the following chemical composition in weight percentage:

[0081] C 3.70, Si 2.50, Mn<0.3, P<0.03, S<0.02, Mg 0.045,

[0082] Re 0.015, Cu 0.60, Ni 0.60, Mo 0.30, and the rest are iron.

[0083] A method for preparing a CuNiMo alloyed austempering nodular cast iron scraper conveyor scraper, comprising the following steps:

[0084] 1) CuNiMo alloying is used to produce nodular cast iron: low-carbon scrap steel is added with carburant charge, and nodular cast iron hot metal is melted in an induction furnace. The chemical composition of the nodular cast iron raw hot metal is (wt%):

[0085] C 3.60, Si 1.60, Mn<0.3, P<0.03, S<0.02,

[0086] Cu 0.60, Ni 0.60, Mo 0.30, the rest is iron;

[0087] 2) Spheroidizing nodular cast iron by pouring into the cover: the so-called spheroidizing treatment by pouring into the cover, that is, sp...

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Abstract

The invention discloses a scraper of a CuNiMo alloying isothermal quenching ductile iron scraper conveyor. The raw material of the scraper is isothermal quenching ductile iron, and the ductile iron comprises the following chemical components in percentage by weight: 3.60 to 3.80 percent of C, 2.20 to 2.80 percent of Si, less than 0.3 percent of Mn, less than 0.03 percent of P, less than 0.02 percent of S, 0.035 to 0.055 percent of Mg, 0.01 to 0.02 percent of Re, 0.40 to 0.80 percent of Cu, 0.40 to 0.80 percent of Ni, 0.20 to 0.40 percent of Mo, and the balance of iron. The scraper has the following advantages: the cost of the scraper of the invention is nearly one third less than that of a forged scraper, the energy consumption is greatly reduced, the load of a driving device is lightened at the same time, and the scraper has long service life and remarkable technical benefit, economic benefit and social benefit.

Description

technical field [0001] The invention relates to a scraper conveyor scraper used in the coal machinery industry and a preparation method thereof, in particular to a CuNiMo alloyed isothermally quenched nodular cast iron scraper conveyor scraper and a preparation method thereof. Background technique [0002] The scraper conveyor is one of the most important equipment in the coal machinery industry, and the scraper is a key component on the scraper conveyor. At present, the scraper on the scraper conveyor is made of 40Mn2 forged steel, and the scraper has to undergo overall quenching and tempering heat treatment, and the hardness after heating is HB260-320, σ b ≥1000Mpa, σ 0.2 ≥800Mpa, δ≥10%, α k ≥60J / cm 2 . The surface quenching at both ends of the scraper requires a hardness of HRc 40-45. Currently forged scrapers require large-scale forging equipment, which requires a large investment and greatly increases the production cost of scrapers. At the same time, the hardened...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65G19/22C22C37/10C22C33/08B22D1/00C21D1/20C21D1/34C21D5/00
CPCY02P10/20
Inventor 王怀林许凤海王烈
Owner 宣化冶金工业有限责任公司
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