Steel for construction machinery bucket teeth and method for preparing bucket teeth
A technology of construction machinery and bucket teeth, which is applied in the field of low alloy steel, can solve the problems of short service life, poor impact toughness and easy fracture of construction machinery bucket teeth, and achieves improved hardenability, delayed crack formation process, and high surface activity Effect
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Embodiment 1
[0028] The steps for preparing bucket teeth are as follows:
[0029] First, smelting and casting:
[0030] 1) Melt the cast steel raw material, add 0.3% ferromanganese and 0.3% ferrosilicon to pre-deoxidize and adjust the composition when the temperature of molten steel rises to 1540°C-1560°C, and adjust the composition, take samples and 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 TiN composite modifier at the bottom of the ladle; B The mass percentage is 0.0012%, Re-Si rare earth ferrosilicon alloy: 0.032%...
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 temperature of molten steel 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 ...
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 temperature of molten steel 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 ...
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