Preparation method of high-chromium roller for steel tube reducing mill or sizing mill and high-chromium roller prepared thereby

A technology of reducing machine and sizing machine, which is applied in the field of casting processing, can solve the problems of wear resistance and low comprehensive strength, and achieve the effects of good surface quality, increased hardness of rolls, and saving processing materials

Active Publication Date: 2011-11-23
SHANDONG PROVINCE SIFANG TECHN DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of wear resistance and low comprehensive strength of cast rolls used in seamless steel pipe tension reducing machines or sizing machines, and to provide a hot-rolled seamless steel pipe tension reducing machine or sizing machine. High chromium roll and its preparation method

Method used

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  • Preparation method of high-chromium roller for steel tube reducing mill or sizing mill and high-chromium roller prepared thereby
  • Preparation method of high-chromium roller for steel tube reducing mill or sizing mill and high-chromium roller prepared thereby
  • Preparation method of high-chromium roller for steel tube reducing mill or sizing mill and high-chromium roller prepared thereby

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preparation example Construction

[0018] The preparation method of the present invention mainly includes: smelting, casting, annealing heat treatment, rough machining, quenching and tempering heat treatment, and finally finishing.

[0019] Since the hot-rolled seamless steel pipe tension reducer and the high-chromium roll of the sizing machine require a sufficiently thick working layer, there are strict requirements on the quality of the slab, and the present invention has carried out several improvements on the casting and heat treatment methods as follows :

[0020] Smelting: It can be smelted in a medium frequency induction furnace. Select the composition ratio of high chromium rolls for smelting to obtain molten steel with the required composition. The invention adds degassing and argon blowing refining process in the smelting process to ensure pure molten steel.

[0021] Billet: It can be produced by centrifugal casting method or other sand casting methods. In the present invention, an integral cold ir...

Embodiment 1

[0037] Example 1 is to manufacture high chromium rolls for hot-rolled seamless steel tube sizing mills for Φ250 seamless steel tube continuous rolling mills. The roll components are shown in Table 1 by weight percentage (%Wt).

[0038] Table 1

[0039] C

Si

mn

P

S

Cr

Mo

Cu

Al

Nb

Ti

N

RE

1.63

0.30

0.70

0.029

0.017

9.00

0.6

0.15

0.10

0.16

0.18

0.06

0.02

[0040] The rest is Fe.

[0041] Select the ratio of raw materials according to the components listed in Table 1, and carry out smelting in an intermediate frequency induction furnace. During the smelting process, degassing and argon blowing refining processes are added to ensure that the required components and pure molten steel are obtained.

[0042] The cast billet is produced by centrifugal casting method. There is an integral cooling iron at the lower end of the casti...

Embodiment 2

[0046] Example 2 is to manufacture high chromium rolls for hot-rolled seamless steel tube sizing mills for Φ508 seamless steel tube peripheral rolling mills. The roll components are shown in Table 2 by weight percentage (%Wt).

[0047] Table 2

[0048] C

Si

mn

P

S

Cr

Mo

Cu

Al

Nb

Ti

N

RE

2.15

0.50

0.50

0.030

0.021

11.00

0.4

0.28

0.25

0.25

0.26

0.27

0.46

[0049] The rest is Fe.

[0050] Select the ratio of raw materials according to the components listed in Table 2, smelt in an intermediate frequency induction furnace, add degassing and argon blowing refining process in the smelting process, to obtain pure molten steel.

[0051] The cast billet is produced by centrifugal casting method. There is an integral cooling iron at the lower end of the casting mold, and 8-12mm thick molding sand is laid on the upper surface of the...

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Abstract

The invention discloses a high-chromium cast roller for a steel tube reducing mill or sizing mill and a preparation method thereof. The preparation method is characterized by optimizing the design of components, selecting the component proportioning of the roller according to the application of the roller and the specific in-service working conditions and technical requirements, and melting corresponding iron alloy, scrap steel and other raw materials to obtain required molten steel; carrying out centrifugal or sand casting to obtain blanks of a required size; and carrying out annealing, quenching, tempering and other thermal treatment on the cast blanks, and carrying out turning, milling and other machining operation to produce the high-chromium roller for a hot rolling seamless steel tube tension reducing mill and sizing mill. The surface hardness of the roller disclosed by the invention is obviously improved, and the macrohardness is up to 54-62 HRC, so that the service life of the high-chromium cast roller is increase by at least two times. Because of the increase of the wear resistance and service life, the replacement frequency of the roller is reduced, thereby saving the materials and production cost. Besides, the rolling capability and yield of the seamless steel tube unit is improved.

Description

technical field [0001] The invention relates to the technical field of casting processing, in particular to a method for preparing a high-chromium roll for a hot-rolled seamless steel pipe tension reducing machine or a sizing machine and the high-chromium roll. Background technique [0002] The reducing or sizing process of the seamless steel pipe is a multi-stand continuous rolling process of the steel pipe without a mandrel. The sizing is to complete the rolling of the precision of the steel pipe size and the true roundness. In addition to the sizing task, the sizing requires a large reduction rate to realize the production of small-diameter steel pipes from large pipe materials. The reducing and sizing machine is generally a two-roll or three-roll type with 3 to 24 racks, and the size of the steel pipe after reducing and sizing will not change. The reducing and sizing rolls of seamless steel pipes are subjected to the combined stress of tangential tension and radial comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/36C22C38/28C21D9/38C21D1/18C21D1/26B22C9/08B22C9/28
Inventor 袁厚之张凝刘行一王平
Owner SHANDONG PROVINCE SIFANG TECHN DEV
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