Steel material for thermal cutting using oxygen
A technology for thermal cutting and steel, applied in the field of steel for thermal cutting, which can solve the problems of not guaranteeing laser cutting properties, and not having itself, and achieve the effect of good laser cutting properties.
Inactive Publication Date: 2012-10-03
NIPPON STEEL & SUMITOMO METAL CORP
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
[0022] Like the methods of Patent Document 4 and Patent Document 5, the scale adhesiveness is improved by adding various elements, but there is no regulation on the scale itself, which greatly affects the laser cutting performance, and stable laser cutting is not guaranteed. cut off
Method used
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Embodiment 1
[0120] The slabs of steel No.1 to No.22 having the chemical composition shown in Table 1 were heated to 1120°C, and after the initial scale was removed by descaling, they were rolled at a finishing temperature of 750°C to 900°C to Three types of steel materials were obtained with plate thicknesses of 16mm, 25mm, and 32mm. After that, wait for the scale to grow, and correct the flatness with a leveler after water cooling. Scale remains on the surface of manufactured steel.
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A steel material for thermal cutting using oxygen, which has a chemical composition that contains, in mass%, 0.06 to 0.20% of Si, 0.010 to 0.033% of P, and more than 0.02 to 0.08% of Al and that satisfies P / Si >= 0.12 and Al / Si <= 0.60, and which has, on the surface, a scale wherein an Si-rich region having an Si concentration of 0.4% or more is present in the form of a layer and an Al-rich region having an Al / Si ratio of 0.3 or more is present in the form of a layer on the surface-layer side of the Si-rich region.
Description
technical field [0001] The present invention relates to a steel material for thermal cutting using oxygen, and specifically relates to a steel material for thermal cutting using oxygen that can be cut at high speed by using laser, plasma, or gas. In particular, it relates to a steel material having a surface rolling scale (oxidized film on a metal surface) formed when the steel material is rolled. Background technique [0002] Through the remarkable technological progress of laser cutting machines in recent years, laser cutting machines can not only be used to cut thin plates with a thickness of 3.2 mm or less, but also can be used to cut thick plates with a thickness of 30 mm. Therefore, laser cutting machines are widely used to cut thick plates. Compared with the gas cutting machine, the laser cutting machine has fewer safety problems and is suitable for use under the condition of unmanned operation at night. For nighttime unmanned operation using a laser cutting machine...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C22C38/00C22C38/06C22C38/58C21D8/02
CPCC22C38/14C22C38/06C22C38/002C21D8/0226C22C38/02C22C38/005C22C38/12C22C38/04C21D8/0263C22C38/16C22C38/001C22C38/00
Inventor 上村隆之藤原知哉新宅祥晃冈田光久保谕前田隆雄
Owner NIPPON STEEL & SUMITOMO METAL CORP
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