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High-strength lifting sling for building and manufacturing method thereof

A high-strength, construction-use technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve unsatisfactory problems and achieve the effect of improving surface strength, fatigue strength and surface strength, and high resistance to shear stress

Inactive Publication Date: 2015-09-02
浙江汇力建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two indicators of the current domestic spreader heads are not satisfactory, so it is urgent to invent a spreader with high tensile strength, shear stress resistance and high fatigue strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A high-strength spreader for construction, the spreader includes a spreader head, and the chemical composition of the spreader head is as follows: C: 0.45%, Si: 0.31%, Mn: 0.9%, Cr: 1.32 %, Mo: 0.22%, Ni: 0.18%, Nb: 0.52%, W: 0.46%, RE: 0.12%, P: 0.0061%, S: 0.0011%, and the balance is Fe and unavoidable impurities. The ratio of the average number of carbides per unit area from the surface to 1 mm below the surface in the section of the spreader head to the average number of carbides per unit area with a section center radius of 0.5 mm is 1:2.01.

Embodiment 2

[0027] A preparation method of a high-strength spreader for construction, the spreader includes a spreader head, and the preparation steps of the spreader head are as follows:

[0028] 1) Casting into a billet: melting according to the chemical composition of Example 1, and then casting a billet of the spreader head in an investment casting manner.

[0029] 2) Surface treatment: the semi-finished spreader head is obtained through the processes of passivation, sand cleaning and shaping of the blank obtained in step 1).

[0030] 3) Quenching: Put the semi-finished product obtained in step 2) into a resistance furnace to raise the temperature. The temperature rise is carried out in stages. The first stage is heated to 462°C, and the temperature is kept for 12 minutes. The second stage is heated to 668°C. Keep it warm for 11 minutes, raise the temperature to 900°C in the third stage, keep it warm for 12 minutes, raise the temperature to 1102°C in the fourth stage, keep it warm for...

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Abstract

The invention relates to a high-strength lifting sling for a building. The lifting sling comprises a lifting sling head. By improving the contents of chemical components of the lifting sling head and a microstructure, and by improving a preparation method of the lifting sling head, a lifting sling product which has higher tensile strength and high shear stress resistance is obtained.

Description

Technical field [0001] The present invention is the field of construction machinery and alloy heat treatment, especially involving a high -intensity architecture and its manufacturing method for building. Background technique [0002] The picker is widely used in the construction field, and the performance of the piano head determines the safety and cost of the building. Because the piano head needs to withstand very high tensile stress and shear stress, if the above performance is not satisfied, it is easy to cause safety accidents to cause safety accidents.EssenceAt the same time, the fatigue intensity of the poured head is also a very important performance indicator. The loading time and number of the loading weight determine the durability of the piano head.However, the current two indicators in China are not satisfactory, so it is urgent to invent a high -tensile strength and shear stress and high fatigue strength. Invention content [0003] One of the goals of the present ...

Claims

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Application Information

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IPC IPC(8): C22C38/48C21D9/00C21D1/18C21D6/04
Inventor 郭策
Owner 浙江汇力建设有限公司
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