Production process of crane boom steel pipe

A production process and crane technology, applied in the improvement of process efficiency, furnace type, furnace and other directions, can solve the problems of unstable impact toughness at low temperature of steel pipes, and achieve uniform and stable impact performance, promote floating, and uniform molten steel temperature and composition.

Inactive Publication Date: 2021-07-23
JIANGSU YONGGANG GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a crane jib steel pipe production process, and solve the problem of unstable low-temperature impact toughness of steel pipes

Method used

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  • Production process of crane boom steel pipe
  • Production process of crane boom steel pipe
  • Production process of crane boom steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A crane jib steel pipe production process, one batch produces five furnaces of steel, the tube billet manufacturing method includes electric furnace smelting, LF refining, VD vacuum treatment, continuous casting, blanking, and rolling to obtain the tube billet. Steel pipe processing methods include: cutting, heating, piercing, rolling, normalization, sizing, heat treatment, straightening, shot blasting, flaw detection, testing, etc. to obtain finished steel pipes. details as follows:

[0059] Step S1, molten steel smelting: first, the blast furnace smelts coke and ore into molten iron that meets the requirements, then puts the molten iron and steel scrap into the electric furnace, blows oxygen into the molten pool of the electric furnace, and adds lime to form slag. When the temperature is not higher than 1560°C, the phosphorus content in the steel is removed by slag replacement and furnace door slag flow. When the tapping carbon and tapping phosphorus meet the target ...

Embodiment 2

[0096] Another crane jib steel pipe production process, compared with Case 1, only the specification of the finished steel pipe and the heat treatment holding time in this embodiment are different. The finished product specification of this example is The heat treatment process is: 940°C, heat preservation for 80min, water quenching, tempering at 650°C, heat preservation for 160min. The mechanical properties and low-temperature impact energy were tested, as shown in Table 4, which also all meet the mechanical property requirements of steel pipes and meet the production needs.

[0097] Table 4 Mechanical properties of steel pipes

[0098]

[0099] From the implementation cases 1 and 2, it can be seen that by controlling the various links of smelting-continuous casting-rolling, round steel with qualified composition and uniform structure can be obtained. After the round steel is heated, pierced, rolled, normalized, sized, and heat treated, a steel pipe with stable mechanic...

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Abstract

The invention discloses a production process of a crane boom steel pipe. The production process comprises the steps of molten steel smelting and LF refining, wherein harmful elements such As P, S, As and Sn in steel are reduced to a low level through a control process of an electric furnace and an LF refining process; and then, after VD vacuum treatment and continuous casting steel rolling, perforating and pipe rolling are carried out, normalizing treatment, heating sizing and pipe manufacturing are carried out to obtain a finished steel pipe, wherein the normalizing treatment plays a role in refining grains, and then heat treatment is carried out to obtain a stable tempered sorbite structure, so that the impact performance of the product is uniform and stable.

Description

technical field [0001] The invention relates to a production process of steel pipes for crane jibs, and belongs to the technical field of pipes for crane jibs. Background technique [0002] The crawler crane jib is composed of a multi-section assembled truss structure, and the truss is welded and assembled by joints of 3-12m seamless steel pipes. It is a key component for carrying, transferring and lifting weight. In recent years, while vigorously developing wind power, nuclear energy, solar energy and other emerging energy industry projects, the country has rapidly promoted the construction of projects such as the West-East Gas Pipeline and the Sino-Russian Natural Gas Pipeline, which has increased the demand for field hoisting equipment and forced crawler cranes to move towards Large tonnage, super large tonnage, and ultra-low temperature harsh environments suitable for extremely cold regions are developing, which requires that the boom pipe must have high strength, high u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/064C21C7/072C21C7/10B21C37/06C21C5/52C21D8/10
CPCC21C7/06C21C7/064C21C7/072C21C7/10B21C37/06C21C5/52C21D8/105C21D2211/00Y02P10/20
Inventor 张新文江宏亮轩康乐刘永孙智伟许民
Owner JIANGSU YONGGANG GROUP CO LTD
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