Casting high ferrochrome or casting high chromium steel roll for welding steel pipe

A technology for welding steel pipes and high-chromium iron, which is applied in the field of casting rolls, can solve the problems of poor performance and use effect, low wear resistance, long process flow, etc. Effect

Active Publication Date: 2008-10-08
SHANDONG PROVINCE SIFANG TECHN DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to solve the problems existing in the process of manufacturing and using the above-mentioned welded steel pipe roll, thus providing a cast high-chromium iron or cast high-chromium steel roll to replace the current alloy tool steel forged roll , to solve the shortcomings of alloy tool steel forged rolls such as long process flow, high difficulty, low production efficiency, low material utilization rate, low wear resistance, poor performance and effect, and low service life in the processing and manufacturing of alloy tool steel forged rolls.

Method used

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  • Casting high ferrochrome or casting high chromium steel roll for welding steel pipe
  • Casting high ferrochrome or casting high chromium steel roll for welding steel pipe
  • Casting high ferrochrome or casting high chromium steel roll for welding steel pipe

Examples

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Effect test

Embodiment 1

[0028] refer to figure 1 As shown, in this embodiment, according to the application of cast high-chromium iron or cast high-chromium steel rolls to rolling mills for rolling welded steel pipes according to the present invention, a set of 2 pieces of Φ530.0 welded Side extrusion rolls for steel pipes, the composition of which is selected from the following high-chromium iron components (by weight): C: 1.8%, Si: ≤1.0%, Mn: ≤1.0%, P: ≤0.05%, S: ≤0.05% , Cr: 13%, Ni: 1.0%, Mo: 1.2%, Ti: 0.2%, V: 0.2%, Cu: 0.5%, RE: 0.05%, and the rest is Fe. The hardness after heat treatment in this embodiment is HRC58-59.8.

[0029] Select the ratio of raw materials according to the composition requirements, melt and cast in an intermediate frequency induction furnace to obtain the required blank, and then perform heat treatment, turning, grinding and other processing to manufacture side extrusion rolls for welded steel pipes.

[0030]The side extrusion roll for the welded steel pipe of the pre...

Embodiment 2

[0032] Implementation 2 is shaped like figure 2 shown. According to the purpose of the present invention, a set of 2 pieces of Φ273.1 welded steel pipes has been manufactured by the casting production process, and its composition is selected from the following high-chromium steel composition (in weight percentage): C: 0.9%, Si : ≤1.0%, Mn: ≤1.0%, P: ≤0.05%, S: ≤0.05%, Cr: 10%, Ni: 0.5%, Mo: 0.8%, Ti: 0.3%, V: 0.5%, W: 0.3%, RE: 0.015%, the rest is Fe.

[0033] Select the ratio of raw materials according to the composition requirements, melt and cast in a medium frequency induction furnace to obtain the required blank, and then perform heat treatment, turning, grinding and other processing to manufacture welded steel pipes with extrusion rolls.

[0034] Example 2 is an upper extrusion roll for welded steel pipes, the weight of the blank is 91.6kg / piece, the weight of the finished product is 65.5kg / piece, and the material utilization rate is 71.5%. In this embodiment, if the...

Embodiment 3

[0036] Implementation 3 is shaped like image 3 shown. According to the purpose of the present invention, a set of 2 pieces of 500 * 500mm welded rectangular steel pipes has been manufactured with the casting production process, and its composition is selected from the following high-chromium iron composition (in weight percent): C: 2.8%, Si: ≤1.0%, Mn: ≤1.0%, P: ≤0.05%, S: ≤0.05%, Cr: 22%, Ni: 2.5%, Mo: 2.0%, Ti: 0.1%, V: 0.3%, Cu: 0.5 %, RE: 0.1%, the rest is Fe.

[0037] Select the ratio of raw materials according to the composition requirements, melt and cast in an intermediate frequency induction furnace to obtain the required blank, and then perform processing such as turning and grinding to produce the lower roll for welding rectangular steel pipes.

[0038] Embodiment 3 is a lower roll for welding rectangular steel pipes of 500×500mm, the blank weight is 3513kg / piece, the finished product weight is 2780kg / piece, and the material utilization rate is 79.1%. The roll h...

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Abstract

The invention provides a cast high chrome iron or cast high chrome steel roller used to roll weld steel tube and on straight-slim welding steel tube roller, or the like, wherein the cast high chrome iron roller comprises C in 1.8-2.8%, Si <=1.0%, Mn <=1.0%, P<=0.05%, S<=0.05%, Cr in 12-22%, Ni in 0.5-3.0%, Mo in 0. 0%, Ti in 0-0.3%, V in 0-1.0%, Cu in 0-1.0%, RE in 0.01-0.5%, and the left is Fe. The inventive roller has uniform organism, high abrasion resistance and flexibility, while its service life is 2-5 times of general product and material utilization can reach 70% or 80%, with low cost.

Description

technical field [0001] The invention relates to a cast roll, in particular to a cast high-chromium iron or cast high-chromium steel roll for rolling welded steel pipes. Background technique [0002] The roll is the main component with the largest consumption in the production of welded steel pipe. The quality and life of the roll directly affect the quality and production efficiency of the welded steel pipe. The rolls are in direct contact with the rolled piece and complete the entire rolling process. While bearing the effect of relatively large compressive stress, it also has to bear rolling and sliding friction, and some are also affected by severe cooling and heat, so they are severely worn and need to be replaced frequently. [0003] At present, the welded steel pipe rolls that represent the international advanced level are forged rolls made of alloy tool steel with the grades X165CrMoV12 or X155CrMoV121 produced in Germany, X165CrMoV12KU produced in Italy, D2 produced ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B27/00C22C37/08C22C38/50C22C38/46C22C38/44C22C38/40
CPCC22C38/56C22C38/005C22C38/44
Inventor 袁厚之张凝刘行一王平
Owner SHANDONG PROVINCE SIFANG TECHN DEV
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