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Steel pipe-straightening roller for casting high chromium iron or high chrome steel

A straightening roll and high-chromium iron technology, which is applied in the field of casting high-chromium iron or casting high-chromium steel steel pipe straightening rolls, can solve the problems of limited hardened layer of forging straightening rolls, and overcome the limited hardened layer and process. The effect of less and simple production process

Active Publication Date: 2007-05-30
SHANDONG PROVINCE SIFANG TECHN DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the present invention, steel pipe straightening rollers are made of new cast high-chromium iron or cast high-chromium steel. Due to the characteristics of high carbon, high chromium, high nickel and high molybdenum and good alloying material ratio, the steel pipe straightening roller can be obtained consistent with the outside and inside. Wear-resistant, shock-resistant and heat-resistant performance, overcomes the shortcomings of limited hardened layer and low wear resistance of forged straightening rollers, and is a product with simple production process, high wear resistance and long service life

Method used

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  • Steel pipe-straightening roller for casting high chromium iron or high chrome steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Manufacture a set of steel pipe straightening rolls in hot straightening state for Φ250 seamless steel pipe continuous rolling mill, a total of 6 pieces. The composition range of selected cast high chromium iron is as follows (unit is weight percentage):

[0039] C

Si

mn

P

S

Cr

Ni

Mo

V

Cu

2.8

≤1.0

≤1.0

≤0.04

≤0.04

22

1.5

2.0

0.2

0.5

[0040] Add rare earth element RE: 0.01%, the rest is Fe.

[0041] Select the ratio of raw materials according to the composition requirements, carry out conventional smelting in an intermediate frequency induction furnace, and perform conventional sand casting to obtain the required blank, and then perform conventional processing such as turning and grinding to produce Φ250 seamless steel pipes for continuous rolling mills. Straightening state with steel pipe straightening rollers.

[0042] The steel pipe str...

Embodiment 2

[0044] Manufacture a set of steel pipe straightening rolls for φ180 seamless steel pipe continuous rolling mill, 6 pieces in total. The composition range of selected cast high chromium iron grades is as follows.

[0045] C

Si

mn

P

S

Cr

Ni

Mo

V

Cu

1.8

≤1.0

≤1.0

≤0.04

≤0.04

12

0.5

0.8

0.2

0.8

[0046] Add rare earth RE: 0.02%, the rest is Fe.

[0047] According to the composition requirements, the ratio of raw materials is selected, conventional melting is carried out in an intermediate frequency induction furnace, and conventional sand casting is carried out to obtain the required blank, and then conventional heat treatment and processing such as turning and grinding are carried out to produce a φ180 seamless steel pipe continuous rolling unit Straighten the rolls with steel pipes.

[0048] The φ 180 seamless steel tube con...

Embodiment 3

[0050] In this embodiment, according to the application of cast high chromium iron or cast high chromium steel steel pipe straightening rolls in the present invention to a steel pipe straightening machine, a set of 10 pieces of Φ140 seamless steel pipes are fully floating and continuously rolled by casting production technology. Steel pipe straightening rollers in hot straightening state for the unit, the composition of which is selected from the following high-chromium iron composition (by weight percentage):

[0051] C

Si

mn

P

S

Cr

Ni

Mo

V

Cu

2.3

≤1.0

≤1.0

≤0.04

≤0.04

16

1.2

1.2

0.4

0.2

[0052] Add rare earth RE: 0.2%, the rest is Fe.

[0053] Select the raw material ratio according to the composition requirements, melt and cast in the medium frequency induction furnace to obtain the required blank, and then perform heat treatment, tu...

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Abstract

A new type casting chromium iron or casting chromium iron tube rectifier roll is used for steel tube straightener, with main element of the direct roll with C: 1.8-2.8%,Si:<=1.0%,Mn:<=1.0%,P:<=0.04%,S:<=0.04%, Cr:12-22%,Ni:0.5-3.0%,Mo:0.8-3.0%,V:0-1.0%,Cu:0-1.0%, the rest with Fe. Rated in weight of the components should be C: 0.7-1.2%,Si:<=1.0%,Mn:<=1.0%,P:<=0.04%,S:<=0.04%; Cr:8.0-12%,Ni:0.5-2.0%,Mo:0.8-3.0%,V:0-1.0%, with the rest being Fe. Due to even inside and outside of the cast iron steel tube roll, it has higher performance in wearing resistance and toughness, with doubled durability. Due to reduced material, it greatly reduces production cost. Its performance surpasses the international level with life span of it over two times of the national made ones.

Description

technical field [0001] The invention relates to a straightening roller for a straightening machine, in particular to a casting high-chromium iron or casting high-chromium steel steel pipe straightening roller applied to a steel pipe straightening machine. Background technique [0002] The steel pipe straightening roll is the roll used to straighten the steel pipe and shape the cross section of the steel pipe. It is one of the most important and most consuming parts in the production of steel pipes. Because the roller straightening machine can straighten the steel pipe during the movement at a high speed, the production efficiency is high, and it is easy to realize mechanization and continuous production, so the steel pipe production generally adopts different types of roller straightening machines for straightening. When the steel pipe straightening roller is working, its working surface is in direct contact with the steel pipe, and under the action of compressive stress, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D3/02B21D37/00C22C37/10C22C38/46C22C38/44
Inventor 袁厚之张凝刘行一王平
Owner SHANDONG PROVINCE SIFANG TECHN DEV
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