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Steel for bucket teeth of construction machinery and preparation method of bucket teeth

A technology for construction machinery and bucket teeth, applied in the field of low alloy steel, can solve the problems of short service life, poor impact toughness of construction machinery bucket teeth, easy fracture, etc., to improve hardenability, delay crack formation process, and increase surface activity. Effect

Active Publication Date: 2015-05-27
柳州市友军机械配件铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a steel for construction machinery bucket teeth and a preparation method for bucket teeth, which can solve the problems of poor impact toughness, easy fracture and short service life of construction machinery bucket teeth

Method used

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  • Steel for bucket teeth of construction machinery and preparation method of bucket teeth

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The steps for preparing bucket teeth are as follows:

[0029] First, smelting and casting:

[0030] 1) Melt the cast steel raw materials, add 0.3% ferromanganese and 0.3% ferrosilicon to pre-deoxidize and adjust the composition when the molten steel temperature rises to 1540°C-1560°C, and then take samples to analyze the chemical composition of molten steel, calculated by weight percentage Adjust to obtain molten steel with C: 0.26%, Si: 0.41%, Mn: 0.90%, Cr: 0.75%, S: ≤0.030%, P: ≤0.030%;

[0031] 2) Raise the temperature of molten steel to 1600°C-1620°C and add 0.1% pure aluminum for final deoxidation, and then stand still for 3-5 minutes after power off to remove the slag and tap the steel.

[0032] 3) Add Re-Si rare earth ferrosilicon alloy with Re content of 30%, B-Fe boron iron alloy with B content of 20% and nano-scale TiN composite modifier at the bottom of the ladle; B The mass percentage is 0.0012%, Re-Si rare earth ferrosilicon alloy: 0.032%, nano-scale TiN...

Embodiment 2

[0038] The steps for preparing bucket teeth are as follows:

[0039] First, smelting and casting:

[0040] 1) Melt the cast steel raw materials, add 0.3% ferromanganese and 0.3% ferrosilicon to pre-deoxidize and adjust the composition when the molten steel temperature rises to 1540°C-1560°C, and then take samples to analyze the chemical composition of molten steel, calculated by weight percentage Adjusted to get C: 0.30%, Si: 0.52%, Mn: 1.10%, Cr: 0.80%, S: ≤0.030%, P: ≤0.030%;

[0041] 2) Raise the temperature of the molten steel to 1600°C-1620°C, add 0.1% pure aluminum for final deoxidation, and stand still for 3-5 minutes after power off to remove the slag and tap the steel.

[0042] 3) Add Re-Si rare earth iron-silicon alloy with Re content of 30%, B-Fe boron-iron alloy with 20% B content and nano-scale TiN composite modifier at the bottom of the ladle, which is crushed into small pieces smaller than 10mm in advance, B The mass percentage is 0.0018%, Re-Si rare earth fer...

Embodiment 3

[0045] The steps for preparing bucket teeth are as follows:

[0046] First, smelting and casting:

[0047] 1) Melt the cast steel raw materials, add 0.3% ferromanganese and 0.3% ferrosilicon to pre-deoxidize and adjust the composition when the molten steel temperature rises to 1540°C-1560°C, and then take samples to analyze the chemical composition of molten steel, calculated by weight percentage Adjusted to get C: 0.32%, Si: 0.70%, Mn: 1.05%, Cr: 0.66%, S: ≤0.030%, P: ≤0.030%;

[0048] 2) Raise the temperature of the molten steel to 1600°C-1620°C, add 0.1% pure aluminum for final deoxidation, and stand still for 3-5 minutes after power off to remove the slag and tap the steel.

[0049] 3) Add Re-Si rare earth iron-silicon alloy with Re content of 30%, B-Fe boron-iron alloy with 20% B content and nano-scale TiN composite modifier at the bottom of the ladle, which is crushed into small pieces smaller than 10mm in advance, B The mass percentage is 0.0021%, Re-Si rare earth fer...

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Abstract

The invention discloses steel for bucket teeth of construction machinery and a preparation method of the bucket teeth, and relates to the technical field of mechanism manufacturing. The steel for the bucket teeth is prepared from the following substances in percentage by weight: 0.25 to 0.33% of C, 0.30 to 0.80% of Si, 0.80 to 1.20% of Mn, 0.60 to 1.0% of Cr, 0.030 to 0.036% of Re, 0.0005 to 0.0035% of B, 0.20 to 0.40% of nanometer TiN, not greater than 0.030% of S, and not greater than 0.030% of P. With the adoption of the method, the problems of poor impact toughness, easy breaking, small service life, and high production cost which is caused by lots of added precious metals Mo and Ni can be solved.

Description

technical field [0001] The invention relates to the technical field of mechanical manufacturing, in particular to a low-alloy steel used for manufacturing engineering machinery bucket teeth. Background technique [0002] Commonly used bucket teeth are made of low alloy material, the composition is: C: 0.25%-0.35%, Si: 0.30%-0.80%, Mn: 0.80%-1.50%, S≤0.03%, p≤0.03%, Cr: 0.50% -1.0%, Ni: 0.40%-0.90%, Mo: 0.25%-0.60%, containing relatively high Mo, Ni and other precious metals, the product cost is high; after casting and heat treatment, the mechanical properties of the product are: tensile Strength σb: 1100Mpa-1500 Mpa, Rockwell hardness (HRC): 44-54, elongation after fracture: 2%-5%, impact energy (AKv): 8J-15J, impact toughness is often not ideal, and a considerable part is in 10J Below or around 10J, the main failure mode of bucket teeth during use is fracture, and the service life is between 150 hours and 300 hours, especially in ore, quarry, steel slag and other working c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C33/04C21D9/00C21C7/00
CPCC21C7/00C21D9/0068C22C33/04C22C38/32
Inventor 龙吉祥
Owner 柳州市友军机械配件铸造有限公司
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