Welded steel tube for carrier roller and manufacturing method thereof

A technology for welding steel pipes and steel pipes, applied in the field of welded steel pipes for idlers and their manufacturing, can solve the problems of insufficient control of forming accuracy, unable to meet the production requirements of idlers, etc., to increase the difficulty of rolling, inhibit the recovery of austenite, The effect of increasing wear resistance

Inactive Publication Date: 2018-12-18
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a welded steel pipe for idlers and its manufacturing method, which is used to solve the contradiction between the processability and the use requirements of the welded steel pipes for idlers in the prior art, insufficient control of forming precision, and failure to meet the production requirements of idlers technical issues

Method used

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  • Welded steel tube for carrier roller and manufacturing method thereof
  • Welded steel tube for carrier roller and manufacturing method thereof
  • Welded steel tube for carrier roller and manufacturing method thereof

Examples

Experimental program
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Embodiment 1

[0028] This embodiment provides a welded steel pipe for idlers, please refer to figure 1 , the composition mass percentage of the welded steel pipe is C: 0.050% to 0.150%, Si: 0.05% to 0.26%, Mn: 0.5% to 1.50%, P: ≤0.010%, S: ≤0.005%, Al: 0.02% ~0.05%, Cr: 0.1%~0.5%, Nb: 0.01%~0.05%, V: 0.01~0.05%, Ti: 0.01%~0.05%, the rest is Fe and unavoidable impurities, and the carbon equivalent Ceq≤0.4 %, cold crack sensitivity index Pcm≤0.2%.

[0029] Further, the mass percentage of Nb+V+Ti in the welded steel pipe is 0.05%-0.10%.

[0030] Specifically, the composition mass percentage of the steel strip is: the proportion of C is 0.050% to 0.150%, and C is one of the most economical strengthening elements in steel. If the C content is too high, the desired elongation cannot be ensured. value, the cold formability, low temperature toughness and weldability of strip steel are also reduced, if the carbon content is too low, the wear resistance of the matrix will be affected, therefore, co...

Embodiment 2

[0036] This embodiment provides a manufacturing method of welded steel pipes for idlers, please refer to Figure 2-4 , the method includes:

[0037] Step 10: Performing a hot rolling process on the steel billet raw material to obtain a hot-rolled steel strip as the steel pipe raw material, the composition mass percentage of the steel billet raw material is C: 0.050% to 0.150%, Si: 0.05% to 0.26%, and Mn: 0.5% to 1.50% %, P: ≤0.010%, S: ≤0.005%, Al: 0.02%~0.05%, Cr: 0.1%~0.5%, Nb: 0.01%~0.05%, V: 0.01~0.05%, Ti: 0.01%~ 0.05%, and Nb+V+Ti is 0.05%~0.10%, the rest is Fe and unavoidable impurities, wherein, the hot rolling process includes:

[0038] Step 101: heating and keeping warm the billet raw material, the heating temperature is 1180-1260°C, and the holding time is 160-200min;

[0039] Step 102: Roughly rolling the heated billet raw material to obtain an intermediate slab, the exit temperature of the rough rolling is 1020-1060°C;

[0040] Step 103: Hot rolling the interme...

Embodiment 3

[0058] In order to understand more clearly a kind of welded steel pipe for idlers provided by the embodiment of the present invention and its manufacturing method, please refer to figure 2 , the embodiments of the present invention will be described in detail below with specific examples.

[0059] In the embodiment of the present invention, the size of the pipe is selected to be 60*2.2mm, and the chemical ratio of each element of the billet raw material is C: 0.06%, Si: 0.15%, Mn: 1.5%, P: 0.008%, S: 0.003%. , Al: 0.035%, Cr: 0.3%, Nb: 0.05%, V: 0.02%, Ti: 0.03%, and the rest are Fe and unavoidable impurities. Wherein the mass percentage of Nb+V+Ti is 0.08%, ranging from 0.05% to 0.10%.

[0060] The billet raw material first undergoes hot rolling process: the thickness is 2.2mm, the furnace temperature is 1250°C, the furnace time is 195min, the rough rolling exit temperature is 1060°C, the intermediate billet thickness is 32mm, the final rolling temperature is 900°C, and the...

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Abstract

The invention discloses a welded steel tube for a carrier roller and a manufacturing method thereof. The welded steel tube comprises the compositions of, by mass, 0.050%-0.150% of C, 0.05%-0.26% of Si, 0.5%-1.50% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.02%-0.05% of Al, 0.1%-0.5% of Cr, 0.01%-0.05% of Nb, 0.01%-0.05% of V, 0.01%-0.05% of Ti and the balance Feand unavoidable impurities, a carbon equivalent Ceq is less than or equal to 0.4%, and a cold crack sensitivity index Pcm is less than or equal to 0.2%. The technical problems that machinability and the usage requirements of the welded steel tube for the carrier roller are inconsistent in the prior art, forming precision control is insufficient and the production requirements of the carrier rollercannot be met are solved. The technical effects that chemical elements of reasonable proportions are used, excellent cold-forming property and welding properties are achieved, the cracking of base metal or weld joints in pipe making is avoided effectively, and through reasonable hot rolling process design, the finished steel coil of hot rolling strip used for produced carrier rollers has a good shape and surface quality, good formability and abrasion resistance to adapt to the processing requirements of welded steel tubes used for the carrier rollers and meet the requirements for the use of welded steel tubes for the carrier rollers.

Description

technical field [0001] The invention relates to the technical field of welded steel pipes for idlers, in particular to a welded steel pipe for idlers and a manufacturing method thereof. Background technique [0002] The idler roller is an important part of the belt conveyor. The function of the idler roller is to support the conveyor belt, reduce the running resistance of the conveyor belt, and keep the sag of the conveyor belt within a certain limit to ensure the smooth operation of the conveyor belt. The idlers account for about 30% to 40% of the weight of the whole machine, and bear more than 70% of the resistance. There are many types and large quantities. The service life of the idlers directly affects the normal operation of the conveyor. With the increase of block size, transportation volume and transportation distance of modern coal transportation, and at the same time in a high-sulfur environment, in the actual use process, the idler roller is often worn by the conv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/26C22C38/24C22C38/28C21D8/02B23P15/00
CPCB23P15/00C21D8/0205C21D8/0226C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/24C22C38/26C22C38/28
Inventor 惠亚军崔阳周杰于洪河陈斌田志红肖宝亮潘辉吴科敏关平冯宝卓周娜王学强徐伟王丽萍崔德涛张大伟李晓林
Owner SHOUGANG CORPORATION
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