Quenching and temperingTempering heat treatment process for different-alloy high-chromium cast iron blow bars

A technology of quenching and tempering heat treatment and high-chromium cast iron, applied in the field of heat treatment of blow bars, can solve the problems of being unsuitable for excessive use and expensive, and achieve the effect of improving toughness and reducing damage

Inactive Publication Date: 2010-12-08
朝阳力宝重工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding elements such as molybdenum, tungsten, niobium and other elements are expensive, and resources need to be protected, so it is not suitable for excessive use

Method used

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  • Quenching and temperingTempering heat treatment process for different-alloy high-chromium cast iron blow bars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The 1212 impact crusher of a crushing plant in Tongliao, the crushed stone is limestone, which is soft and has little impact. We design a blow bar with the following composition (wt%):

[0025] C Si Mn Cr Mo Cu P S Re

[0026] 3.40 0.38 0.96 15.50 0.51 0.86 ≤0.05 ≤0.04 0.2

[0027] Heat the blow bar with the above alloy composition in a high-temperature electric furnace at 30°C / hour to 500°C (low temperature section), and then heat it to 950°C at a heating rate of 50°C / hour, and keep it warm for 4 hours. The temperature error is controlled as ±20°C, then quickly air-cooled and normalized under the direct blowing of the fan, and then tempered the blow bar after normalizing in a high-temperature tempering furnace at 350°C for 5 hours. The atmosphere is air;

[0028] After the quenched and tempered blow bar was used by Tongliao Crushing Plant for 3 months, the powdered limestone was 50,000 cubic meters, and the user was very satisfied. Compared with other blow bars with ...

Embodiment 2

[0030] In the Xinglong Crushing Plant in Chaoyang area, the 1414 impact crusher is also used to crush limestone. The input particle size is large, so the impact is relatively large. We have adjusted the strength and toughness, and the effect is very good. The composition is as follows (wt%):

[0031] C Si Mn Cr Mo Cu Ti V P S Re

[0032] 2.85 0.42 1.06 16.58 0.52 0.90 0.08 0.12 0.04 0.035 0.2

[0033] Heat the blow bar with the above alloy composition in a high-temperature electric furnace at 45°C / hour to 500°C (low temperature section), then heat to 1000°C at a heating rate of 70°C / hour, and keep it warm for 5 hours. The temperature error is controlled as ±20°C, and then quickly air-cooled and normalized under the direct blowing of a strong fan. In summer, it should be properly sprayed, and then the normalized blow bar should be tempered at 450°C for 4 hours in a high-temperature tempering furnace. The temperature is controlled at ±20°C, and the tempering atmosphere is air; ...

Embodiment 3

[0036] Inner Mongolia Jalut Banner Hongguang Crushed Stone Plant, 1070 counterattack broken, crushed granite, the stone is relatively hard, the particle size of the input material is not large, and the impact is small. We adjusted the composition structure and carried out the quenching and tempering treatment of the present invention. After the second test, we obtained Better effect, improve wear resistance 38% on the original basis, final determination composition is as follows (wt%):

[0037] C Si Mn Cr Mo Cu Ni Nd Re P S

[0038] 3.08 0.52 0.85 17.32 1.23 0.50 0.61 0.2 0.2 0.032 0.035

[0039] Heat the blow bar with the above alloy composition in a high-temperature electric furnace at 40°C / hour to 500°C (low temperature section), then heat at a heating rate of 80°C / hour to a temperature of 1050°C and keep it for 4 hours. The temperature error is controlled to ± 20°C, quickly air-cooled and normalized under the direct blowing of a strong fan, and then tempered the blow bar ...

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Abstract

The invention discloses a quenching and tempering heat treatment process for different-alloy high-chromium cast iron blow bars. The method comprises the following steps of: (1) heating the different-alloy high-chromium cast iron blow bar to 950-1050 DEG C in a high-temperature electric furnace, insulating preserving the heat for 3-5 hours, and then carrying out quick air cooling and normalizing; (2) tempering the normalized blow bar for 3-5 hours in a high-temperature tempering furnace at the temperature of 350-500 DEG C, wherein the tempering treatment atmosphere is air, and the alloy high-chromium cast iron components in the alloy high-chromium cast iron blow bar comprises the alloy high-chromium cast irons of Cr15, Cr20, Cr26 and the like. During quenching and tempering heat treatment,the invention improves the roughness of the blow bar under the condition of not affecting the hardness as much as possible, thereby reducing the damage, blocking falling and advanced failure of the blow bar in use.

Description

technical field [0001] The invention belongs to the field of heat treatment of alloy cast iron, in particular to a heat treatment process of a blow bar. Background technique [0002] The blow bar is one of the commonly used wearing parts in the crusher. Its characteristic is that the broken stones are polygonal and have sharp corners. They are usually used in high-grade roads and high-speed railways, and have a broad market demand. In this way, the requirements for crushing stones lead to higher requirements for the quality of the blow bar in the crusher. First, it must have high wear resistance and high hardness; Less breakage, expect a longer lifespan. [0003] In the prior art, the commonly used material of the blow bar is mostly high-chromium cast iron. By adding different alloying elements such as Mn, Mo, Ti, V, W, Nb, etc. to the high-chromium cast iron for alloying, the high-chromium cast iron can be made It has the combination of high hardness and toughness. Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D5/00C21D1/25C22C37/10
Inventor 宋宝珠康新
Owner 朝阳力宝重工集团有限公司
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