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Steel for excavator slewing bearing and production process thereof

A technology of slewing bearing and production process, applied in the direction of manufacturing converters, etc., can solve the problems of increasing the replacement frequency of slewing bearings, increasing the use cost of excavators, and insufficient strength of slewing bearings, so as to improve quenching characteristics, improve quenching and tempering Stability, reasonable effect of material composition design

Inactive Publication Date: 2016-08-24
许炳初
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

N in steel mainly plays the role of solid solution strengthening and precipitation strengthening, but N leads to aging and blue embrittlement of steel, and too high will also cause porosity and air bubbles in steel
However, S is easy to react with Fe to form FeS, which makes the steel easy to crack during press processing and reduces the plasticity of the material.
The insufficiency of these process designs makes the slewing bearing not strong enough in application, not wear-resistant, and has a short life, which eventually leads to an increase in the replacement frequency of the slewing bearing and increases the use cost of the excavator.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A steel for slewing bearings of excavators. The elements and their mass percentages in the raw materials are: C: 0.48%, Si: 0.17%, Mn: 0.70%, Cr: 0.04%, Mo: 0.20%, P: 0.014%, S : 0.016%, Ni 0.20%, Cu: 0.012%, V: 0.06%, and the balance is Fe.

[0026] A production process of steel for excavator slewing bearings, comprising the following steps:

[0027] (1) Converter smelting: ①Charging: Put 80% molten iron and 20% steel scrap into the oxygen top-bottom double-blowing converter ②Blowing slag making: Lower the oxygen lance, add slag in 3 times, The slag material is composed of 20% limestone, 30% lime, 26% dolomite, and 24% iron ore. Use a three-hole nozzle oxygen lance to stir the molten pool, ignite and blow for 14 minutes, and control the temperature at 1200°C. ③Deoxidation tapping: stop blowing Refining, transfer molten steel to LF furnace ladle ④ pour slag;

[0028] (2) LF refining: ① Converter tapping: Pour molten steel into LF furnace ladle ② Wire feeding: Add lime...

Embodiment 2

[0033] A steel for slewing bearings of excavators, the elements and their mass percentages in the raw materials are C: 0.54%, Si: 0.32%, Mn: 0.85%, Cr: 0.18%, Mo: 0.24%, P: 0.022%, S: 0.022%, Ni 0.30%, Cu: 0.018%, V 0.10%, and the balance is Fe.

[0034] A production process of steel for excavator slewing bearings, comprising the following steps:

[0035] (1) Converter smelting: ①Charging: Put 85% molten iron and 15% steel scrap into the oxygen top-bottom re-blowing converter ②Blowing slag making: Lower the oxygen lance, add slag in 3 times, The slag material is composed of 25% limestone, 33% lime, 22% dolomite, and 20% iron ore. Use a three-hole nozzle oxygen lance to stir the molten pool, ignite and blow for 16 minutes, and control the temperature at 1250°C. ③Deoxidation tapping: stop blowing Refining, transfer molten steel to LF furnace ladle ④ pour slag;

[0036] (2) LF refining: ① Converter tapping: Pour molten steel into LF furnace ladle ② Wire feeding: Add limestone, ...

Embodiment 3

[0041] A steel for slewing bearings of excavators. The elements and their mass percentages in the raw materials are: C: 0.50%, Si: 0.18%, Mn: 0.72%, Cr: 0.08%, Mo: 0.20%, P: 0.018%, S : 0.014%, Ni: 0.22%, Cu: 0.014%, V 0.08%, and the balance is Fe.

[0042] A production process of steel for excavator slewing bearings, comprising the following steps:

[0043] (1) Converter smelting: ①Charging: Put 87% molten iron and 13% steel scrap into the oxygen top-bottom double-blowing converter ②Blowing slag making: Lower the oxygen lance, add slag in 3 times, The slag material is composed of 22% limestone, 31% lime, 22% dolomite, and 25% iron ore. Use a three-hole nozzle oxygen lance to stir the molten pool, ignite and blow for 18 minutes, and control the temperature at 1250°C. ③Deoxidation tapping: stop blowing Refining, transfer molten steel to LF furnace ladle ④ pour slag;

[0044] (2) LF refining: ① Converter tapping: Pour molten steel into LF furnace ladle ② Wire feeding: Add lime...

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PUM

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Abstract

The invention discloses steel for an excavator slewing bearing and a production process thereof, and belongs to the technical field of slewing bearing materials. The steel is prepared from, by mass, 0.48-0.54% of C, 0.17-0.32% of Si, 0.70-0.85% of Mn, 0.04-0.18% of Cr, 0.20-0.24% of Mo, 0.022% or below of P, 0.022% or below of S, 0.30% or below of Ni, 0.018% or below of Cu, 0.10% of below of V and the balance Fe. The production process comprises converter smelting, LF refining, vacuum degassing (VD), continuous casting and steel billet examination and storage. The production process has the advantage that the strength and wear resistance of the steel for the slewing bearing can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of slewing bearing materials, in particular to a steel for slewing bearings of excavators and a production process thereof. Background technique [0002] Slewing rings are widely used in the arm bends of cranes and excavators in the actual industry, and are called "joints of machines". It is an important transmission part necessary for a machine that needs to perform relative rotary motion between two objects and at the same time need to bear axial force, radial force and tipping moment. The excavator has high working intensity and high frequency, and the working environment is diverse and harsh, which requires the slewing bearing to have high wear resistance, good toughness and high strength. [0003] In the prior art, steel for slewing bearings cannot meet the ever-changing requirements of industrial production and application for material quality due to congenital defects in material composition and insu...

Claims

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Application Information

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IPC IPC(8): C22C38/18C22C38/12C22C38/02C22C38/04C22C38/08C22C38/16C21C5/35C21C7/06C21C7/064C21C7/10
CPCC22C38/18C21C5/35C21C7/06C21C7/064C21C7/10C21C2007/0093C22C38/02C22C38/04C22C38/08C22C38/12C22C38/16
Inventor 许炳初
Owner 许炳初
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