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Steel for high-tenacity air cooling drill tool and production method thereof

A high-strength-toughness, air-cooled technology, applied in the production field of high-strength-toughness air-cooled drill steel and high-strength-toughness air-cooled drill steel, can solve the problems of wide tempering brittleness range, increased material cost, grain boundary oxidation, etc. The effect of crystallizing grains and substructures

Active Publication Date: 2016-06-22
贵州惠沣众一机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the higher Ni content leads to a significant increase in material cost, and at the same time, the surface microstructure of this type of material is coarser after carburizing, which is not conducive to improving the fatigue life of the drill rod
For this reason, some people use low-cost Si-Mn-Mo series low-medium carbon bainitic steel to replace Ni-Cr series steel to reduce costs. After carburizing, this type of steel can obtain high strength under appropriate air cooling conditions. Toughness, its air-cooling hardenability is good, and uniform bainite structure can be obtained on the entire cross-section, but Si-Mn-Mo-Cr air-cooled bainite steel is prone to grain boundary oxidation during carburization, and there is also the first This will damage the fatigue strength and life of the drill tool, and it is also not conducive to the further improvement of the strength and toughness of the drill tool

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for producing high-strength toughness air-cooled drill steel, comprising the following steps:

[0016] By weight percentage as follows:

[0017] C: 0.323%, Si: 1.05%, Mn: 2.092%, Cr: 1.8, Mo: 0.25%, V: 0.08%, Al: 0.127%, Sc: 0.008%, or add other rare earth elements Ce, La: 0.001 at the same time -0.02%, the balance is iron.

[0018] (1) Al-Sc master alloy is used as the additive, and the weight percentage of Sc in the master alloy is 1.5%. In the refining process after smelting and deoxidation, the intermediate alloy is added to the molten steel by the insertion method to homogenize it to obtain an Al-Sc-containing steel ingot;

[0019] (2) The steel ingot is forged and rolled at 1100°C, then heated at 880°C and then air-cooled: the bainite structure is obtained at a cooling rate of 50°C / min, and it has excellent strength and toughness after tempering at 250°C, without the first type of tempering. fire brittleness;

[0020] (3) Conventional air cooling at a...

Embodiment 2

[0022] A method for producing high-strength toughness air-cooled drill steel, comprising the following steps:

[0023] By weight percentage as follows:

[0024] C: 0.193%, Si: 1.02%, Mn: 2.02%, Mo: 0.21%, Cr: 1.2, V: 0.11%, Al: 0.501%, Sc: 0.010%, or add other rare earth elements Ce: 0.006% at the same time The amount is iron.

[0025] (1) The Al-Sc master alloy is used as the additive, and the weight percentage of Sc in the master alloy is 2%. In the refining process after smelting and deoxidation, the intermediate alloy is added to the molten steel by the insertion method to homogenize it to obtain an Al-Sc-containing steel ingot;

[0026] (2) The steel ingot is forged and rolled at 1100°C, then heated at 880°C and then air-cooled. The bainite + martensite structure is obtained at a cooling rate of 100°C / min. After tempering at 250°C, it has excellent strength and toughness, and does not produce The first type of temper brittleness;

[0027] (3) After carburizing at 920°...

Embodiment 3

[0029] A method for producing high-strength toughness air-cooled drill steel, comprising the following steps:

[0030] By weight percentage as follows:

[0031] C: 0.1%, Si: 0.7%, Mn: 1.7%, Mo: 0.1%, Cr: 0.7, V: 0.2%, Al: 0.02%, Sc: 0.001%, or add other rare earth elements Ce, La: 0.02 at the same time , and the balance is iron.

[0032] (1) The Al-Sc master alloy is used as the additive, and the weight percentage of Sc in the master alloy is 3%. In the refining process after smelting and deoxidation, the intermediate alloy is added to the molten steel by the insertion method to homogenize it to obtain an Al-Sc-containing steel ingot;

[0033] (2) The steel ingot is forged and rolled at 1100°C, then heated at 900°C and then air-cooled. The bainite + martensite structure is obtained at a cooling rate of 200°C / min. After tempering at 180°C, it has excellent strength and toughness, and does not produce The first type of temper brittleness;

[0034] (3) After carburizing at 91...

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Abstract

The invention discloses steel for high-tenacity air cooling drill tool and a production method thereof.The steel is prepared from, by weight, 0.1-0.40% of C, 0.7-1.3% of Si, 1.7-2.5% of Mn, 0.7-2.0% of Cr, 0.1-0.3% of Mo, 0.04-0.2% of V, 0.02-0.6% of Al, 0.001-0.08% of Sc, or 0.001-0.02% of other rare earth elements Ce and La, and the balance Fe, wherein Sc is from intermediate alloy of Al and Sc, and the weight percent of the Sc in the intermediate alloy is 1.5-4%.According to the steel, the tenacity and plasticity can be improved, the drilling tool and other components have the best toughness cooperation, the service fatigue life of the drilling tool is remarkably prolonged, and the steel is not likely to deform and low in cost.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a high-strength toughness air-cooled drill steel and a production method of the high-strength toughness air-cooled drill steel. Background technique [0002] Rock drilling tools are slender rods, and direct liquid quenching will easily lead to severe deformation and make them unusable. Therefore, heavy-duty drill rods are made of low-carbon alloy steel, and then carburized, air-cooled, quenched, and tempered at low temperature to reduce quenching deformation. Martensite is obtained in the surface carburized layer, and martensite plus bainite is obtained in the center as the final use structure. However, most of these steels currently use low-carbon Ni-Cr steels, which have the advantages of stable performance, excellent strength and toughness, low notch sensitivity, and gentle surface carbon concentration gradient after carburizing. However, a higher Ni content leads to a si...

Claims

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Application Information

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IPC IPC(8): C22C38/18C22C38/12C22C38/06C22C38/04C22C38/02C22C33/06
CPCC22C33/06C22C38/005C22C38/02C22C38/04C22C38/06C22C38/12C22C38/18
Inventor 梁益龙雷旻刘勇
Owner 贵州惠沣众一机械制造有限公司
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