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Steel material for thermal cutting with oxygen

A technology of thermal cutting and steel materials, which is applied in laser welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of short life of consumables, and achieve the effect of high-speed and stable thermal cutting operation

Active Publication Date: 2010-03-24
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in plasma cutting, the life of the consumables used in the cutting machine is short. Especially when cutting thick steel plates, there is a problem that the life of the consumables becomes extremely short due to the need for high output power to generate plasma.

Method used

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  • Steel material for thermal cutting with oxygen
  • Steel material for thermal cutting with oxygen
  • Steel material for thermal cutting with oxygen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0152] Steels 1 to 19 having the chemical compositions shown in Table 1 were melted in the laboratory, and then hot-rolled to produce two types of steel materials with a width of 250 mm, a length of 500 mm, and a thickness of 16 mm and 23 mm, respectively.

[0153] In addition, steels 1 to 16 in Table 1 are steels of the examples of the present invention whose chemical compositions are within the prescribed range of the present invention. On the other hand, steels 17 to 19 are steels of comparative examples whose chemical compositions are outside the conditions specified in the present invention.

[0154]

[0155] Next, the surface of the rolled steel material is shot blasted to remove the rolled scale. In addition, the 10-point average roughness (RzJIS) of the surface of any of the steel materials after shot blasting was 49.6 μm.

[0156] Then, adopt the method of air spraying, to each steel material except test serial number 1 in Table 2, i.e. to each steel material surf...

Embodiment 2

[0169] The same test as in Example 1 above was performed by changing the surface roughness of the steel material. More specifically, using steel 1 and steel 3 described in Table 1, the size of the balls in shot blasting was changed, and test pieces having different surface roughness RzJIS were produced, and the laser cutting properties were evaluated in the same manner as the steel materials shown in Example 1.

[0170] Table 3 shows the results of the investigation when the surface roughness was changed. In addition, in Table 3, the test materials of test numbers 21 to 24 are steel materials from which scale has been removed, and the test materials of test numbers 25 to 28 are steel materials coated with steel materials in the same manner as after descaling. Steel with zinc primer. In addition, the test number 1 and the test number 3 of are described as the test number 21 and the test number 25, respectively.

[0171]

[0172] It can be seen from Table 3 that, for test...

Embodiment 3

[0174] The remainder of the steel material used in , especially the steel material having a thickness of 23 mm, was subjected to plasma cutting to evaluate plasma cutting properties.

[0175] The plasma cutting machine used for the cutting was a plasma cutting machine (SUPER400) manufactured by Koike Sanso Co., Ltd., the cutting condition was an output current of 137.8 A, and oxygen was used as the plasma gas.

[0176] After piercing (piercing), cut out a 50 mm x 50 mm block from each steel material, check whether there is any defect in the cut surface at this time, and observe the presence of slag (that is, the attachment on the cut side of the molten steel containing oxides). Attachment status. The evaluation of the critical cutting speed is: increase the cutting speed of 1200mm / min at a speed of 120mm / min (10% speed of the initial cutting speed), and determine whether there is a chipping phenomenon, slag adhesion, and poor cutting caused by overburning. And the highest cut...

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Abstract

A steel material which has been rid of surface scale and which contains Si: 0.08 to 0.20%, Al: more than 0.03% to 0.08%, and one or more of P, Ti and V and satisfies the relationships: ¢Al / Si=0.45! and ¢262(Al / Si)+197(P / Si)+225(Ti / Si) +50(V / Si)>123! wherein each symbol of element represents the content of the element. The steel material permits high-speed stable thermal cutting and is usable as the material for laser beam cutting, plasma arc cutting, and gas cutting. The steel material may have an inorganic zinc primer coat on the surface.

Description

technical field [0001] The present invention relates to a steel material for thermal cutting using oxygen, and more specifically, to a steel material for thermal cutting using oxygen that can be cut at high speed using laser, plasma, gas, etc., and whose surface scale has been removed. In particular, it relates to a so-called "zinc primer" coated with a disposable antirust paint containing zinc powder, especially an inorganic zinc primer, which can be cut at a high speed using laser, plasma, gas, etc. Steel for thermal cutting using oxygen. Background technique [0002] In recent years, the technological progress of laser cutting machines has been remarkable. Laser cutting machines are not only suitable for cutting thin plates with a thickness of 3.2 mm or less, but also for cutting thick plates with a thickness of 30 mm. Laser cutting machines are used for thick plates. The cutting off is also becoming popular. [0003] Laser cutting machines have advantages that gas cutt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/28B23K26/38C22C38/16C22C38/58
CPCC22C38/06C22C38/02C22C38/04C22C38/16C22C38/001C22C38/08
Inventor 上村隆之藤原知哉新宅祥晃前田隆雄久保谕冈田光
Owner NIPPON STEEL CORP
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