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Processing process of wear-resisting anti-impact type pile foundation steel protective barrel

A processing technology, steel casing technology, applied in the direction of basic structure engineering, process efficiency improvement, metal material coating technology, etc., can solve the hidden dangers of engineering quality, affect the construction quality of pile foundation, rupture and scrapping and other problems, and achieve the elimination of safety Hidden dangers, saving scrap rate of consumables, and improving quality

Inactive Publication Date: 2015-02-04
TIANSHUN GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, steel casings for construction are an important tool for pile foundation construction. Most of the ordinary steel casings are HRB335 and HRB400 steel, and a small amount of HRB500 steel is used. Although the above-mentioned ordinary steel casings are widely used in house construction in my country However, under the action of artificial active loads during the construction process, when entering the surface of the foundation soil and forming a borehole, it is often broken and scrapped due to excessive impact force and excessive sinking height, which seriously affects the construction of the pile foundation. quality, causing hidden dangers in engineering quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a processing technology for a wear-resistant and impact-resistant pile foundation steel casing. The chemical composition of the selected steel blank is: C: 0.26%, Si: 0.20%, Mn: 0.88%, Cr: 0.85% , Mo: 0.16%, N: 0.015%, P: 0.010%, S: 0.001%, Nb: 0.01%, V: 0.18%, rare earth: 0.22%, 0.4% residual elements, and the rest is Fe;

[0032] Among the rare earths, the following components are contained by weight percentage: Gd: 15%, Pr: 3%, Dy: 7%, Ac: 12.5%, Nd: 15%, Sm: 11%, and the balance is La;

[0033] Specifically include the following steps:

[0034] Step (1): Put the above-mentioned steel blank in a furnace and heat it to 1300-1400°C. After the steel blank is heated, it is drawn into a closed environment of methane or ethane for drawing operation, and drawn into a sheath blank of the required size ; After leaving the heating furnace, use water cooling to cool the steel bars to 920-950 °C at a cooling rate of 23-25 ​​°C / s, and then cool them to r...

Embodiment 2

[0040] This embodiment provides a processing technology for a wear-resistant and impact-resistant pile foundation steel casing. The chemical composition of the selected steel blank is: C: 0.38%, Si: 0.30%, Mn: 1.0%, Cr: 1.0% , Mo: 0.22%, N: 0.030%, P: 0.032%, S: 0.0018%, Nb: 0.25%, V: 0.36%, rare earth: 0.25%, 0.8% residual elements, the rest is Fe;

[0041] Among the rare earths, the following components are contained by weight percentage: Gd: 18%, Pr: 5%, Dy: 9%, Ac: 12.8%, Nd: 20%, Sm: 13%, and the balance is La;

[0042] Specifically include the following steps:

[0043] Step (1): Put the above-mentioned steel blank in a furnace and heat it to 1300-1400°C. After the steel blank is heated, it is drawn into a closed environment of methane or ethane for drawing operation, and drawn into a sheath blank of the required size ; After exiting the heating furnace, use water cooling to cool the steel bar to 920-950 ° C at a cooling rate of 23-25 ​​° C / s, and then cool it to room te...

Embodiment 3

[0049] This embodiment provides a processing technology for a wear-resistant and impact-resistant pile foundation steel casing. The chemical composition of the selected steel blank is: C: 0.3%, Si: 0.25%, Mn: 0.9%, Cr: 0.9% , Mo: 0.20%, N: 0.20%, P: 0.25%, S: 0.0015%, Nb: 0.02%, V: 0.25%, rare earth: 0.24%, 0.6% residual elements, the rest is Fe;

[0050] Among the rare earths, the following components are contained by weight percentage: Gd: 16%, Pr: 4%, Dy: 8%, Ac: 12.6%, Nd: 18%, Sm: 12%, and the balance is La;

[0051] Specifically include the following steps:

[0052] Step (1): Put the above-mentioned steel blank in a furnace and heat it to 1300-1400°C. After the steel blank is heated, it is drawn into a closed environment of methane or ethane for drawing operation, and drawn into a sheath blank of the required size ; After exiting the heating furnace, use water cooling to cool the steel bar to 920-950 ° C at a cooling rate of 23-25 ​​° C / s, and then cool it to room tem...

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Abstract

The invention discloses a processing process of a wear-resisting anti-impact type pile foundation steel protective barrel. 0.16-0.22% of Mn, 0.85-1.0% of Cr and 0.16-0.22% of Mo are added, so that the atomic activities of the elements C and N are improved, air mass formed by each atom can form strong interaction with dislocation to generate a yield platform, and relatively great stress is needed to be provided by the outside to start the dislocation, and therefore, the tensile strength is guaranteed to reach 675 / Mpa, the percentage elongation after fracture is guaranteed to reach 18.20%, the end-surface shrinking percentage is guaranteed to reach 38%, the yield point elongation is guaranteed to reach 44.4J and the yield point elongation is guaranteed to reach 850 / Mpa. The processing process of the wear-resisting anti-impact type pile foundation steel protective barrel disclosed by the invention can be used for improving the hardness and the wear resistance of the pile foundation steel protective barrel, and has the advantages of high strength, no pollution, good hardenability, less possibility in cracking and low degree of relaxation.

Description

technical field [0001] The invention relates to a processing technology of a wear-resistant and impact-resistant pile foundation steel casing. Background technique [0002] At present, steel casings for construction are an important tool for pile foundation construction. Most of the ordinary steel casings are HRB335 and HRB400 steel, and a small amount of HRB500 steel is used. Although the above-mentioned ordinary steel casings are widely used in house construction in my country However, under the action of artificial active loads during the construction process, when entering the surface of the foundation soil and forming a borehole, it is often broken and scrapped due to excessive impact force and excessive sinking height, which seriously affects the construction of the pile foundation. quality, resulting in project quality hidden dangers. Contents of the invention [0003] Purpose of the invention: The purpose of the present invention is to provide a processing technolog...

Claims

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Application Information

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IPC IPC(8): C22C38/26C21D1/18C21D6/00C23C8/22C23F17/00E02D5/66
CPCY02P10/20
Inventor 姚圣法吴海洋
Owner TIANSHUN GROUP
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