WO2012014851A1 - Steel material for thermal cutting using oxygen - Google Patents
Steel material for thermal cutting using oxygen Download PDFInfo
- Publication number
- WO2012014851A1 WO2012014851A1 PCT/JP2011/066874 JP2011066874W WO2012014851A1 WO 2012014851 A1 WO2012014851 A1 WO 2012014851A1 JP 2011066874 W JP2011066874 W JP 2011066874W WO 2012014851 A1 WO2012014851 A1 WO 2012014851A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cutting
- less
- steel material
- steel
- oxygen
- Prior art date
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Definitions
- the present invention relates to a steel material for thermal cutting using oxygen, and more particularly to a steel material for thermal cutting using oxygen that can be cut at high speed with a laser, plasma, or gas.
- the present invention relates to a steel material on which a surface mill scale (black skin) generated during steel material rolling is formed.
- laser cutting machines can be applied not only to cutting thin plates with a thickness of 3.2 mm or less, but also with thick plates up to 30 mm. Therefore, laser cutting machines are widely used for cutting thick plates.
- the laser cutting machine has less safety problems than the gas cutting machine, and is suitable for use in unattended operation at night.
- work using large steel materials hereinafter, steel materials may be described as “steel plates”) may be used to ensure sufficient work. It is desirable.
- the above-mentioned cutting troubles can be broadly classified into two types, one with a cause on the cutting machine side and one with a cause on the steel plate side.
- Plasma cutting has a high cutting speed and can cut a steel plate thicker than laser cutting. Furthermore, the plasma cutting machine has an advantage that maintenance is easier than a laser cutting machine. However, the plasma cutting machine has a drawback that the life of the consumable is short. In particular, cutting thick steel plates with high-power plasma shortens the life of consumables. Therefore, there is a great need for a technique for stably cutting a steel plate at a high speed at a low output.
- Patent Document 1 discloses a steel plate excellent in laser cutting property in which a scale mainly composed of Fe 3 O 4 (magnetite) is formed and a method for producing the same.
- Patent Document 2 discloses a scale characterized in that after rolling is completed at a temperature of 850 to 720 ° C., water is sprayed on the front and back surfaces of the steel sheet to cool the steel sheet to a temperature of 600 to 700 ° C., and then air-cooled. A method for producing a steel sheet having excellent adhesion and laser cutting properties has been proposed.
- Patent Document 3 discloses a steel sheet for laser cutting, characterized in that the surface roughness of the scale is 3.0 ⁇ m or less in terms of centerline average roughness (Ra) and Cu + Ni + Cr is contained in an amount of 0.3% by mass or more. Is disclosed.
- Al is oxidized during rolling to form an Al 2 O 3 -containing layer at the interface between the base iron and the scale, thereby improving the adhesion of the scale.
- a thick steel plate excellent in laser cutting property that satisfies ⁇ Al + Cu + Ni ⁇ 2.0 mass% and a method for producing the same are disclosed.
- Patent Document 5 describes that Cr, Al, A thick steel sheet having a concentrated layer in which one or more of Cu and Ni are concentrated and having a thickness of 1.0 ⁇ m or more and excellent in laser cutting properties is disclosed.
- JP 2003-221640 A JP-A-8-218119 JP-A-8-3692 Japanese Patent Laid-Open No. 11-323478 Japanese Patent Application Laid-Open No. 11-343541
- a thin scale is formed by high pressure water descaling and low temperature rolling, and the scale composition is controlled by cooling.
- this method makes the scale too thin.
- oxygen is used as an assist gas.
- the upper part of the steel plate where the laser beam is concentrated is cut by the laser, and the lower part of the steel plate is cut by the oxidation reaction heat of the steel plate.
- the scale on the surface of the steel plate suppresses the oxidation reaction at the top of the steel plate. Without the scale, an oxidation reaction starts on the surface of the steel sheet, melting proceeds in the surface direction, not in the cross-sectional direction, and causes cutting defects such as cutting notches and gouging.
- An object of the present invention is to provide a steel material that can be prevented as much as possible and that can be cut at high speed using a plasma cutting machine and a gas cutting machine.
- the present inventors conducted various investigations on the behavior of steel materials in the thermal cutting of steel materials using oxygen such as high-power laser cutting, plasma cutting, and gas cutting. As a result, first, the following findings (a) and (b) were obtained.
- the present invention has been completed on the basis of the above findings, and the gist thereof is a steel material for thermal cutting using oxygen as shown in the following (1) to (8).
- Si 0.06 to 0.20%, P: 0.010 to 0.033%, Al: more than 0.02% and not more than 0.08%, P / Si
- a steel material having a chemical composition satisfying ⁇ 0.12 and satisfying Al / Si ⁇ 0.60, and having a scale on the surface, In the scale, there is a layer of Si-concentrated regions in which Si is 0.4% or more, and an Al-concentrated region in which the Al / Si ratio is 0.3 or more exists in layers on the surface side of the Si-concentrated region.
- the chemical composition of the steel material is characterized in that, instead of a part of Fe, by mass%, and further containing one or both of Ti: 0.05% or less and V: 0.05% or less.
- the chemical composition of the steel material is selected from mass%, Mo: 0.5% or less, W: 0.4% or less, and Nb: 0.04% or less, instead of part of Fe.
- the chemical composition of the steel material is selected from mass%, Ca: 0.005% or less, Mg: 0.005% or less, and REM: 0.005% or less, instead of part of Fe.
- the chemical composition of the steel material is mass% instead of part of Fe, and further contains Sn: 0.50% or less, Cu: less than 0.1%, and the Cu / Sn ratio is 1.
- the steel material of the present invention is a steel material for thermal cutting using oxygen as shown above. It is a steel material for cutting using oxygen as an assist gas, in other words, an oxidation reaction, and can be used for laser cutting, plasma cutting, gas cutting, and the like.
- the steel material of the present invention is insensitive to laser defocus due to swells or scratches, so that the allowable range of variation that can be cut from the laser focus position increases, and the cutting heat input It has extremely good laser cutting property that the burning phenomenon hardly occurs even when the height is increased. Therefore, if the steel material of the present invention is used, it is possible to cut at a very high speed using a high-power laser cutting machine, and it is possible to cut a complicated shape without defects without performing scale control by special heat treatment. Is possible.
- the “bridge” for ensuring cutting dimension accuracy due to distortion can be minimized. That is, since it is possible to ultimately shorten the time for the person to gas-cut the bridge portion, productivity can be improved. Further, in plasma cutting, it is possible to cut at a high speed by suppressing the wavy phenomenon of the cut surface.
- Si 0.06 to 0.20%
- Si is an element that oxidizes during thermal cutting using oxygen to form Fe 2 SiO 4 in the scale, and largely governs thermal cutting properties using oxygen.
- the Si content greatly affects the amount of Fe 2 SiO 4 formed. That is, the eutectic temperature of Fe 2 SiO 4 is 1173 ° C., which is much lower than the melting point of FeO (1369 ° C.). Therefore, if Fe 2 SiO 4 is present in the iron oxide generated during thermal cutting using oxygen, the liquid phase is maintained up to 1173 ° C., so that the molten Fe or iron oxide is discharged in a low temperature range. Becomes easier and the cutting property is improved.
- the Si content in the base material is less than 0.06%, the amount of Fe 2 SiO 4 produced is reduced and it becomes difficult to discharge the molten Fe or iron oxide. The phenomenon called “Egure” occurs.
- the Si content is closely related to the presence of Fe 2 SiO 4 in the scale, so that the Si content in the Si concentrated region of the scale is 0.4% or more. It is necessary to make the Si content in the steel material 0.06% or more.
- the Si content is 0.06 to 0.20%.
- the upper limit with preferable Si content is 0.15%.
- the preferred lower limit is 0.08%.
- P / Si ⁇ 0.12 P is an element that is most likely to be contained in Fe 2 SiO 4 at the time of cutting and effectively lowers the eutectic point, and makes it easy to discharge molten Fe or iron oxide in a low temperature range, and thermal cutting using oxygen Has the effect of enhancing the sex. Furthermore, since the discharge of iron oxide is facilitated, an increase in the steel sheet temperature during cutting is suppressed, and thermal distortion during cutting is suppressed. For this reason, the content of P becomes an important factor like Si.
- the P needs to be contained in a sufficient amount with respect to Si.
- the P / Si ratio is preferably 0.15 or more.
- the P content is less than 0.010%, the Si content has to be reduced to make the P / Si ratio 0.15 or more, and the Fe 2 SiO 4 amount is reduced. For this reason, the stability of laser cutting is reduced, and the limit cutting speed is reduced in plasma cutting.
- the cutting performance improves as the P content increases. However, if it exceeds 0.033%, the improvement shows a saturation tendency, and the properties of the steel material such as mechanical properties and weldability deteriorate. Therefore, in order to obtain excellent cutting properties, the P content needs to be 0.010 to 0.033%.
- Al more than 0.02% and 0.08% or less, Al / Si ⁇ 0.60 Since Al has a deoxidizing action, it needs to be contained. Further, Al, like P, is easily contained in Fe 2 SiO 4 present in the iron oxide generated during thermal cutting using oxygen, and has the effect of lowering the eutectic temperature. Therefore, the molten Fe or iron oxide can be easily discharged in a low temperature range, and the thermal cutting property (laser cutting property) is improved. Furthermore, in order to set the Al / Si ratio in the Al-concentrated region in the scale described later to 0.3 or more, Al needs to be contained in an amount exceeding 0.02%.
- Al if Al exceeds 0.08%, hard island martensite is generated in the welded portion, and the toughness deteriorates. Therefore, the Al content is more than 0.02% and not more than 0.08%.
- the upper limit with preferable Al content is 0.05%.
- a preferred lower limit is 0.03%.
- Al 2 O 3 alumina having a high melting point is generated in addition to Fe 2 SiO 4 at the time of thermal cutting using oxygen, and the cutting performance deteriorates.
- the content of Al is set to Al / Si ⁇ 0.60 in relation to the content of Si.
- the steel material for thermal cutting using oxygen according to the present invention preferably contains the following amount of elements.
- C 0.02 to 0.20% Since C is an element that increases the strength, it is preferable to contain 0.02% or more. However, if it exceeds 0.20%, the toughness of the steel sheet may be deteriorated. Therefore, the C content is preferably 0.02 to 0.20%. C is an inexpensive element, and since the effect of improving the cutting property by reaction heat between O (oxygen) and C in steel can be expected at the time of thermal cutting using oxygen, the lower limit of the C content is 0.05%. More preferably.
- Mn 0.20 to 1.60% Since Mn is an element effective for ensuring the strength of the steel material, it is preferably contained in an amount of 0.20% or more. However, when the content of Mn exceeds 1.60%, deterioration of toughness and thermal cutting ability using oxygen may be caused. Therefore, the Mn content is preferably 0.20 to 1.60%. The lower limit of the Mn content is more preferably 0.30%. The upper limit of the Mn content is more preferably 1.30%.
- S 0.015% or less S is present in steel as an impurity and has little influence on the thermal cutting property using oxygen, but if its content is large, mechanical properties such as toughness of the steel material May adversely affect properties. Therefore, the S content is preferably suppressed to a certain amount or less, and is preferably 0.015% or less. The S content is more preferably 0.010% or less.
- Cu 0.01% or more and less than 0.5%
- Cu is an element that improves corrosion resistance. In order to acquire this effect, it is necessary to make it contain 0.01% or more.
- the Cu content is more preferably 0.02% or more.
- Ni 0.01 to 0.5%
- Ni is also an element that improves the corrosion resistance. In order to acquire this effect, it is necessary to make it contain 0.01% or more.
- the Ni content is more preferably 0.02% or more.
- the content of Ni is preferably suppressed to a certain amount or less, preferably 0.5% or less, and more preferably 0.4% or less.
- N 0.009% or less N is present in steel as an impurity, and when its content is large, the weldability and the quality of the slab may be adversely affected. For this reason, the N content is preferably suppressed to a certain amount or less, and is preferably 0.009% or less.
- the steel for thermal cutting using oxygen according to the present invention is in mass%, C: 0.02 to 0.20%, Si: 0.06 to 0.20%, Mn: 0.20.
- P 0.010 to 0.033%
- S 0.015% or less
- Al more than 0.02% to 0.08% or less
- Cu 0.01% to 0.5% %
- Ni 0.01 to 0.5%
- N 0.009% or less, with the balance being Fe and impurities.
- an impurity means the component mixed by various factors of raw materials such as ores and scraps and the manufacturing process, and is allowed within a range that does not adversely affect the present invention.
- the steel for thermal cutting using oxygen may further contain one or more selected from the elements listed in the following (a) to (f) as necessary.
- B One or more of Ti: 0.05% or less and V: 0.05% or less
- Cr 2.0% or less
- Mo Mo: 0.4% or less
- W 0.4 % Or less
- Nb one or more of 0.04% or less
- B 0.003% or less
- e Ca: 0.005% or less
- Mg 0.005% or less
- REM 0.005 % Or less of (%) or less
- Sn 0.50% or less
- Ti and V are both elements that lower the eutectic point of Fe 2 SiO 4 , and are formed of molten Fe or iron oxide. It has the effect of facilitating discharge in a low temperature range and enhancing the thermal cutting property using oxygen. For this reason, in cutting using oxygen, particularly laser cutting, performance is improved.
- Ti is preferably 0.05% and V is preferably 0.05% as the upper limit, and 0.04% as the upper limit. More preferably.
- the Ti and V contents are each preferably 0.005% or more, and more preferably 0.01% or more.
- Cr 2.0% or less Cr has the effect of increasing the strength of the steel sheet.
- the content exceeds 2.0%, Cr oxide having a high melting point is formed to deteriorate the flowability of the molten metal.
- the Cr content in the case of inclusion is 2.0% or less.
- the Cr content is more preferably 1.5% or less.
- the Cr content is preferably 0.02% or more, and more preferably 0.03% or more.
- Mo 0.5% or less
- W 0.4% or less
- Nb 0.04% or less Mo
- W, and Nb have the effect of increasing the strength. You may contain said element. Details will be described below.
- Mo has the effect of increasing the strength of the steel sheet by solid solution strengthening.
- Mo content in the case of inclusion is 0.5% or less.
- the Mo content is more preferably 0.4% or less.
- W also has the effect of increasing the strength of the steel sheet by solid solution strengthening.
- W is contained in a large amount exceeding 0.4%, it is disadvantageous in terms of cost and weldability may be impaired. Therefore, if W is included, the W content is 0.4% or less.
- the W content is more preferably 0.3% or less. In order to acquire said effect, it is preferable to contain W 0.05% or more, and it is more preferable to contain 0.08% or more.
- Nb has the effect of increasing the strength of the steel sheet by precipitation strengthening.
- containing a large amount of Nb exceeding 0.04% is disadvantageous in terms of cost and may deteriorate the toughness of the welded portion.
- the Nb content in the case of inclusion is 0.04% or less.
- the Nb content is more preferably 0.03% or less.
- the Nb content is preferably 0.005% or more, and more preferably 0.01% or more.
- B 0.0030% or less B has an effect of improving hardenability. However, when B is contained in excess of 0.0030%, the weldability may be deteriorated. Therefore, when B is included, the content of B is set to 0.0030% or less. The B content is more preferably 0.0020% or less. In order to obtain the above effect, B is preferably contained in an amount of 0.0005% or more, and more preferably 0.0008% or more.
- HZ heat affected zone
- Ca has the effect of improving HAZ toughness. However, if the Ca content exceeds 0.005%, the thermal cutting property using oxygen may be impaired. Therefore, when Ca is contained, the content of Ca is set to 0.005% or less.
- the Ca content is more preferably 0.004% or less. In order to acquire said effect, it is preferable to contain Ca 0.001% or more, and it is more preferable to contain 0.002% or more.
- Mg has the effect of improving HAZ toughness. However, if the Mg content exceeds 0.005%, the thermal cutting property using oxygen may be impaired. Therefore, when Mg is contained, the content of Mg is set to 0.005% or less.
- the Mg content is more preferably 0.004% or less. In order to acquire said effect, it is preferable to contain Mg 0.001% or more, and it is more preferable to contain 0.002% or more.
- REM has the effect of improving HAZ toughness. However, if the content of REM exceeds 0.005%, the thermal cutting property using oxygen may be impaired. Therefore, the content of REM in the case of inclusion is 0.005% or less.
- the REM content is more preferably 0.004% or less. In order to acquire said effect, it is preferable to contain REM 0.001% or more, and it is more preferable to contain 0.002% or more.
- REM is a general term for a total of 17 elements of Sc, Y, and lanthanoid, and the content of REM means the total amount of the above elements.
- Sn dissolves as Sn 2+ and has an action of inhibiting corrosion by an inhibitor action in an acidic chloride solution. Further, rapidly to reduce the Fe 3+, by having an effect of reducing Fe 3+ concentration as oxidizing agent, since inhibit corrosion promoting effect of Fe 3+, thereby improving the weather resistance in high airborne salt environments. Moreover, Sn has the effect
- the Sn content is preferably 0.30% or less. In order to acquire said effect, it is preferable to contain Sn 0.03% or more, and it is more preferable to contain 0.05% or more.
- the Cu content is less than 0.1% and the Cu / Sn ratio is 1.0 or less. If the Cu content is 0.1% or more, or the Cu / Sn ratio exceeds 1.0, the corrosion resistance may decrease due to the Cu content, and further, the cause of rolling cracks when manufacturing the steel sheet It becomes.
- the upper limit of the Cu content when Sn is contained is preferably 0.09%.
- the scale is an oxide layer formed by oxidizing the steel surface during the manufacture of the steel material.
- the composition of the scale is not uniform over the entire area of the cross section.
- the cutting property is stabilized by forming the Si concentrated region and the Al concentrated region in a scale in the scale.
- the Si-concentrated region and the Al-concentrated region do not need to be formed as a complete layer on the entire surface of the steel sheet, and even if there is a region that does not satisfy the requirements of the present invention in part of the layer, the cutting performance is greatly affected never give.
- the Si enriched region is formed by the concentration of Si in the vicinity of the scale / steel interface, and is a region relatively rich in Fe 2 SiO 4 .
- the Si concentration region it is necessary to concentrate 0.4% or more of Si by mass%. By forming such a concentrated region, it is considered that cutting defects such as burning are suppressed as a low melting point component at the initial stage of cutting.
- an Al concentrated region is formed in a layered manner on the surface layer side from the Si concentrated region.
- the Al-enriched region is also formed near the scale / steel interface.
- Each concentrated layer exists in the order of the scale / steel interface, the Si concentrated region, and the Al concentrated region from the steel material side. Such a configuration can reliably prevent cutting defects such as burning.
- the quantitative analysis of each element in the scale can be easily measured by a glow discharge luminescence surface analyzer, and the presence of Fe 2 SiO 4 can be confirmed by a technique such as oblique angle X-ray diffraction.
- the thickness of the steel material for thermal cutting using oxygen of the present invention is not particularly limited. Naturally, thin-walled materials can be thermally cut using oxygen, but even those having a thickness of 12 mm or more can be sufficiently heat-cut using oxygen. However, in the case of laser cutting, although depending on the output characteristics, the upper limit of the steel material thickness is preferably 30 mm. In the case of plasma cutting, the upper limit of the steel material thickness is preferably 100 mm, although it depends on the output characteristics.
- the thickness of the scale is not particularly limited, it is a scale produced in a normal steel production process, and a steel material having a scale of 3 to 100 ⁇ m on the surface has a remarkable effect of suppressing cutting defects.
- the scale exceeds 100 ⁇ m, the unevenness of the surface scale tends to become severe, which is not preferable.
- steel No. in Table 1 1 to 18 are steels according to examples of the present invention whose chemical composition is within the range defined by the present invention.
- Steel No. Nos. 19 to 22 are comparative steels that deviate from the conditions specified in the present invention. Among these, steel No. About the steel material of 22, since the crack generate
- the element profile from the surface was measured at a discharge area: 4 mm ⁇ , RF output: 35 W, argon pressure: 600 Pa, Fe in the scale, Main components such as O, Al, Si, and P were analyzed.
- the scale thickness was determined from the O profile. Based on these data, the Si concentrated area and the Al concentrated area in the scale were confirmed, and the Si content in the Si concentrated area and the Al / Si ratio in the Al concentrated area were calculated.
- Laser cutting machine used for cutting is a CO 2 laser output 6kW made Koikesansokogyo Corporation. Cutting was performed at an output of 5000 W and a frequency of 1000 Hz. The oxygen gas pressure was 0.05 MPa on the inside and 0.03 MPa on the outside.
- the cutting margin (cuttable range) is measured by first determining the laser focus on the surface of the steel material, and then conducting a test under conditions where the nozzle tip position is away from the steel material surface at a pitch of 0.25 mm. The determination was made based on whether or not the notch phenomenon and cutting failure due to adhesion of the noro occurred. Then, the maximum deviation of the nozzle tip position where both the notch phenomenon and the adhesion of the nozzle were not observed was measured, and the allowable variation range that can be cut from the laser focus position was obtained.
- the cutting speed was 900 mm / min.
- Type 1 and Type 2 a shape as shown in FIG. 1 (herein referred to as Type 1 and Type 2) from a steel material having a plate thickness of 25 mm and approximately 200 mm ⁇ 200 mm is cut at a cutting speed of 700 mm / min and a duty of 70%. The number of sheets in which the burning phenomenon occurred (resulting rate) was evaluated. An example of the burning phenomenon is shown in FIG. The part where the cutting groove is wide is the part where the burning phenomenon occurs.
- a super 400 manufactured by Koike Oxygen Industry Co., Ltd. was used for plasma cutting.
- a steel material having a width of 150 mm and a thickness of 32 mm was cut at a pitch of 50 mm.
- the speed was increased from 1150 mm / min to 5% pitch (57.5 mm / min) by using the overdrive function of the cutting machine, and it was determined whether or not cutting failure due to back surface adhesion occurred.
- the maximum cutting speed at which no cutting failure (no adhesion) was observed was taken as the limit cutting speed.
- the surface at the maximum speed when cutting was possible was evaluated, and a case where a wavy phenomenon as shown in FIG. 3 was observed was evaluated as x, and a case where a smooth surface quality was observed without a waved phenomenon was evaluated as ⁇ .
- Table 2 summarizes the survey results.
- the test Nos. of the present invention satisfying the conditions specified in the present invention.
- the limit cutting speed is 1350 mm / min or more
- the allowable variation range for laser cutting is 4.75 mm or more, which is insensitive to laser defocus and excellent in cutting performance. .
- test No. of the comparative example In 19 to 21, the cuttable range is 2.5 mm or less. Test No. Although the limit cutting speed increased at 21, the cuttable range was very narrow. That is, even if cutting is possible at high speed, a cutting failure may occur due to slight fluctuations in conditions.
- the steel material of the present invention can be cut without causing a burning phenomenon in a complicated cutting shape.
- test No. of the comparative example In 19 to 21, the limit cutting speed was about 1550 to 1610 mm / min, and even if the cutting was possible, there was a problem in the surface quality.
- the steel material of the present invention is insensitive to defocusing in the case of laser cutting, and has a very good laser cutting property that the burning phenomenon hardly occurs even when the cutting heat input is increased. Therefore, it is possible to cut a complicated shape without any trouble without controlling the scale by special heat treatment. Further, in plasma cutting, it is possible to cut at a high speed by suppressing the wavy phenomenon of the cut surface.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Laser Beam Processing (AREA)
- Arc Welding In General (AREA)
Abstract
Description
スケール中にSiが0.4%以上のSi濃化域が層状に存在し、Si濃化域の表層側にAl/Si比が0.3以上のAl濃化域が層状に存在することを特徴とする酸素を用いた熱切断用鋼材。 (1) By mass%, Si: 0.06 to 0.20%, P: 0.010 to 0.033%, Al: more than 0.02% and not more than 0.08%, P / Si A steel material having a chemical composition satisfying ≧ 0.12 and satisfying Al / Si ≦ 0.60, and having a scale on the surface,
In the scale, there is a layer of Si-concentrated regions in which Si is 0.4% or more, and an Al-concentrated region in which the Al / Si ratio is 0.3 or more exists in layers on the surface side of the Si-concentrated region. A steel material for thermal cutting using oxygen.
Si:0.06~0.20%
Siは、酸素を用いた熱切断中に酸化されてスケール中にFe2SiO4を形成し、酸素を用いた熱切断性を大きく支配する元素である。 (A) About the basic chemical composition of steel:
Si: 0.06 to 0.20%
Si is an element that oxidizes during thermal cutting using oxygen to form Fe 2 SiO 4 in the scale, and largely governs thermal cutting properties using oxygen.
Pは最も切断時にFe2SiO4に含有されやすく、効果的に共晶点を下げる元素であり、溶融したFeあるいは鉄酸化物の低温度域での排出を容易にして酸素を用いた熱切断性を高める作用を有する。さらに、鉄酸化物の排出が容易になることによって、切断時の鋼板温度の上昇が抑制され、切断時の熱歪みが抑制される。このため、Siと同様、Pの含有量は重要な要因となる。 P: 0.010 to 0.033%, P / Si ≧ 0.12
P is an element that is most likely to be contained in Fe 2 SiO 4 at the time of cutting and effectively lowers the eutectic point, and makes it easy to discharge molten Fe or iron oxide in a low temperature range, and thermal cutting using oxygen Has the effect of enhancing the sex. Furthermore, since the discharge of iron oxide is facilitated, an increase in the steel sheet temperature during cutting is suppressed, and thermal distortion during cutting is suppressed. For this reason, the content of P becomes an important factor like Si.
Alは、脱酸作用を有するため、含有させる必要がある。また、AlはP同様に酸素を用いた熱切断時に生成する鉄酸化物中に存在するFe2SiO4に含有されやすく、共晶温度を下げる効果がある。そのため、溶融したFeあるいは鉄酸化物の低温度域での排出を容易にして、熱切断性(レーザー切断性)を高める。さらに、後述するスケール中のAl濃化域のAl/Si比を0.3以上とするため、Alは0.02%を超える量を含有させる必要がある。一方、Alが0.08%を超えると、溶接部に硬質の島状マルテンサイトが生成し、靱性が劣化する。したがって、Alの含有量は0.02%を超えて0.08%以下とする。Al含有量の好ましい上限は0.05%である。また、好ましい下限は0.03%である。 Al: more than 0.02% and 0.08% or less, Al / Si ≦ 0.60
Since Al has a deoxidizing action, it needs to be contained. Further, Al, like P, is easily contained in Fe 2 SiO 4 present in the iron oxide generated during thermal cutting using oxygen, and has the effect of lowering the eutectic temperature. Therefore, the molten Fe or iron oxide can be easily discharged in a low temperature range, and the thermal cutting property (laser cutting property) is improved. Furthermore, in order to set the Al / Si ratio in the Al-concentrated region in the scale described later to 0.3 or more, Al needs to be contained in an amount exceeding 0.02%. On the other hand, if Al exceeds 0.08%, hard island martensite is generated in the welded portion, and the toughness deteriorates. Therefore, the Al content is more than 0.02% and not more than 0.08%. The upper limit with preferable Al content is 0.05%. A preferred lower limit is 0.03%.
本発明に係る酸素を用いた熱切断用鋼材は、前記(A)項に記載の化学組成を有することに加えて、次に述べる量の元素を含有していることが好ましい。 (B) About suitable chemical composition of steel:
In addition to having the chemical composition described in the above item (A), the steel material for thermal cutting using oxygen according to the present invention preferably contains the following amount of elements.
Cは、強度を高める元素であるため、0.02%以上を含有させるのが好ましい。ただし、0.20%を超えると鋼板の靱性を劣化させることがある。このため、Cの含有量は0.02~0.20%とするのが好ましい。Cは安価な元素であり、酸素を用いた熱切断時にO(酸素)と鋼中のCとの反応熱による切断性の向上効果も期待できるため、C含有量の下限は0.05%とするのがより好ましい。 C: 0.02 to 0.20%
Since C is an element that increases the strength, it is preferable to contain 0.02% or more. However, if it exceeds 0.20%, the toughness of the steel sheet may be deteriorated. Therefore, the C content is preferably 0.02 to 0.20%. C is an inexpensive element, and since the effect of improving the cutting property by reaction heat between O (oxygen) and C in steel can be expected at the time of thermal cutting using oxygen, the lower limit of the C content is 0.05%. More preferably.
Mnは、鋼材の強度確保に有効な元素であるため、0.20%以上含有させるのが好ましい。しかしながら、Mnの含有量が1.60%を超えると、靱性の劣化および酸素を用いた熱切断性の劣化を招くことがある。したがって、Mnの含有量は0.20~1.60%とすることが好ましい。Mn含有量の下限は0.30%とするのがより好ましい。また、Mn含有量の上限は1.30%とするのがより好ましい。 Mn: 0.20 to 1.60%
Since Mn is an element effective for ensuring the strength of the steel material, it is preferably contained in an amount of 0.20% or more. However, when the content of Mn exceeds 1.60%, deterioration of toughness and thermal cutting ability using oxygen may be caused. Therefore, the Mn content is preferably 0.20 to 1.60%. The lower limit of the Mn content is more preferably 0.30%. The upper limit of the Mn content is more preferably 1.30%.
Sは、不純物として鋼中に存在し、酸素を用いた熱切断性には殆ど影響を及ぼさないものの、その含有量が多い場合には、鋼材の靱性等の機械的性質に悪影響を及ぼすおそれがある。したがって、Sの含有量は一定量以下に抑えるのがよく、0.015%以下とすることが好ましい。S含有量は0.010%以下とすることがより好ましい。 S: 0.015% or less S is present in steel as an impurity and has little influence on the thermal cutting property using oxygen, but if its content is large, mechanical properties such as toughness of the steel material May adversely affect properties. Therefore, the S content is preferably suppressed to a certain amount or less, and is preferably 0.015% or less. The S content is more preferably 0.010% or less.
Cuは、耐食性を向上させる元素である。この効果を得るには0.01%以上含有させる必要がある。Cu含有量は0.02%以上とすることがより好ましい。一方、その含有量が多い場合には、Cuチェッキングを生じる懸念がある。このため、Cuの含有量は一定量未満に抑えるのがよく、0.5%未満とするのが好ましく、0.4%以下とすることがより好ましい。 Cu: 0.01% or more and less than 0.5% Cu is an element that improves corrosion resistance. In order to acquire this effect, it is necessary to make it contain 0.01% or more. The Cu content is more preferably 0.02% or more. On the other hand, when the content is large, there is a concern of causing Cu checking. For this reason, it is good to suppress Cu content to less than a fixed amount, it is preferable to set it as less than 0.5%, and it is more preferable to set it as 0.4% or less.
Niも、耐食性を向上させる元素である。この効果を得るには0.01%以上含有させる必要がある。Ni含有量は0.02%以上とすることがより好ましい。一方、Ni含有量が多い場合には、鋳片の品位に悪影響を及ぼすおそれがある。そのため、Niの含有量は一定量以下に抑えるのがよく、0.5%以下とするのが好ましく、0.4%以下とすることがより好ましい。 Ni: 0.01 to 0.5%
Ni is also an element that improves the corrosion resistance. In order to acquire this effect, it is necessary to make it contain 0.01% or more. The Ni content is more preferably 0.02% or more. On the other hand, when the Ni content is large, there is a risk of adversely affecting the quality of the slab. Therefore, the content of Ni is preferably suppressed to a certain amount or less, preferably 0.5% or less, and more preferably 0.4% or less.
Nは、不純物として鋼中に存在し、その含有量が多い場合には、溶接性および鋳片の品位に悪影響を及ぼすおそれがある。このため、Nの含有量は一定量以下に抑えるのがよく、0.009%以下とすることが好ましい。 N: 0.009% or less N is present in steel as an impurity, and when its content is large, the weldability and the quality of the slab may be adversely affected. For this reason, the N content is preferably suppressed to a certain amount or less, and is preferably 0.009% or less.
(イ)Ti:0.05%以下およびV:0.05%以下のうちの1種以上
(ロ)Cr:2.0%以下
(ハ)Mo:0.4%以下、W:0.4%以下およびNb:0.04%以下のうちの1種以上
(ニ)B:0.003%以下
(ホ)Ca:0.005%以下、Mg:0.005%以下およびREM:0.005%以下のうちの1種以上
(ヘ)Sn:0.50%以下 The steel for thermal cutting using oxygen according to the present invention may further contain one or more selected from the elements listed in the following (a) to (f) as necessary.
(B) One or more of Ti: 0.05% or less and V: 0.05% or less (b) Cr: 2.0% or less (c) Mo: 0.4% or less, W: 0.4 % Or less and Nb: one or more of 0.04% or less (d) B: 0.003% or less (e) Ca: 0.005% or less, Mg: 0.005% or less, and REM: 0.005 % Or less of (%) or less (f) Sn: 0.50% or less
TiおよびVはいずれも、Fe2SiO4の共晶点を下げる元素であり、溶融したFeあるいは鉄酸化物の低温度域での排出を容易にして酸素を用いた熱切断性を高める作用を有する。このため酸素を用いた切断、特にレーザー切断においては、性能の向上が見られる。しかしながら、プラズマ切断に関しては、逆に限界切断速度を低下させる場合があるため、それぞれTiは0.05%を、Vは0.05%を上限とすることが好ましく、0.04%を上限とすることがより好ましい。上記の効果を得るには、TiおよびVの含有量はいずれも0.005%以上とすることが好ましく、0.01%以上とすることがより好ましい。 One or more of Ti: 0.05% or less and V: 0.05% or less Ti and V are both elements that lower the eutectic point of Fe 2 SiO 4 , and are formed of molten Fe or iron oxide. It has the effect of facilitating discharge in a low temperature range and enhancing the thermal cutting property using oxygen. For this reason, in cutting using oxygen, particularly laser cutting, performance is improved. However, with regard to plasma cutting, since the critical cutting speed may be reduced, Ti is preferably 0.05% and V is preferably 0.05% as the upper limit, and 0.04% as the upper limit. More preferably. In order to obtain the above effects, the Ti and V contents are each preferably 0.005% or more, and more preferably 0.01% or more.
Crは、鋼板の強度を高める作用を有する。しかしながら、その含有量が2.0%を超えると、融点が高いCr酸化物を形成して湯流れ性を悪化させて、酸素を用いた熱切断表面の粗さの劣化およびレーザー切断の場合には切断ノッチ形成につながるおそれがある。そのため、含有させる場合のCrの含有量は、2.0%以下とする。Cr含有量は1.5%以下とすることがより好ましい。上記の効果を得るためには、Crの含有量は0.02%以上とすることが好ましく、0.03%以上とすることがより好ましい。 Cr: 2.0% or less Cr has the effect of increasing the strength of the steel sheet. However, when the content exceeds 2.0%, Cr oxide having a high melting point is formed to deteriorate the flowability of the molten metal. In the case of deterioration of the roughness of the thermal cutting surface using oxygen and laser cutting. May lead to cut notch formation. Therefore, the Cr content in the case of inclusion is 2.0% or less. The Cr content is more preferably 1.5% or less. In order to obtain the above effect, the Cr content is preferably 0.02% or more, and more preferably 0.03% or more.
Mo、WおよびNbは、強度を高める作用を有するので、この効果を得るために上記の元素を含有させてもよい。以下、詳しく説明する。 One or more of Mo: 0.5% or less, W: 0.4% or less, and Nb: 0.04% or less Mo, W, and Nb have the effect of increasing the strength. You may contain said element. Details will be described below.
Bは、焼入れ性を高める作用を有する。しかしながら、Bを0.0030%を超えて含有させると溶接性を劣化させるおそれがある。そのため、含有させる場合のBの含有量は、0.0030%以下とする。B含有量は0.0020%以下とすることがより好ましい。上記の効果を得るためには、Bは0.0005%以上含有させることが好ましく、0.0008%以上含有させることがより好ましい。 B: 0.0030% or less B has an effect of improving hardenability. However, when B is contained in excess of 0.0030%, the weldability may be deteriorated. Therefore, when B is included, the content of B is set to 0.0030% or less. The B content is more preferably 0.0020% or less. In order to obtain the above effect, B is preferably contained in an amount of 0.0005% or more, and more preferably 0.0008% or more.
Ca、MgおよびREMは、溶接熱影響部(以下、「HAZ」という。)の靱性を改善する作用を有するので、この効果を得るために上記の元素を含有させてもよい。以下、詳しく説明する。 One or more of Ca: 0.005% or less, Mg: 0.005% or less, and REM: 0.005% or less Ca, Mg, and REM are in the heat affected zone (hereinafter referred to as “HAZ”). Since it has the effect | action which improves toughness, in order to acquire this effect, you may contain said element. Details will be described below.
スケールは鋼材の製造時に鋼材表面が酸化されて形成された酸化物層である。スケールの組成は、断面の全領域で均一になっているものではない。本発明ではスケール中にSi濃化域、Al濃化域が層状に形成されることで切断性が安定化する。また、Si濃化域、Al濃化域は鋼板全面に完全な層として形成されている必要はなく、層の一部に本発明の要件を満足しない領域が存在しても切断性に大きな影響を与えることはない。 (C) About the scale:
The scale is an oxide layer formed by oxidizing the steel surface during the manufacture of the steel material. The composition of the scale is not uniform over the entire area of the cross section. In the present invention, the cutting property is stabilized by forming the Si concentrated region and the Al concentrated region in a scale in the scale. In addition, the Si-concentrated region and the Al-concentrated region do not need to be formed as a complete layer on the entire surface of the steel sheet, and even if there is a region that does not satisfy the requirements of the present invention in part of the layer, the cutting performance is greatly affected Never give.
本発明の酸素を用いた熱切断用鋼材の厚みについては特に限定はしない。薄肉のものは当然に酸素を用いた熱切断可能であるが、厚みが12mm以上のものでも十分に酸素を用いた熱切断することができる。ただし、レーザー切断の場合には出力特性にも依存するが、鋼材厚みの上限は30mmとすることが好ましい。プラズマ切断の場合には出力特性にも依存するが、鋼材厚みの上限は100mmとするのが好ましい。 (D) Other:
The thickness of the steel material for thermal cutting using oxygen of the present invention is not particularly limited. Naturally, thin-walled materials can be thermally cut using oxygen, but even those having a thickness of 12 mm or more can be sufficiently heat-cut using oxygen. However, in the case of laser cutting, although depending on the output characteristics, the upper limit of the steel material thickness is preferably 30 mm. In the case of plasma cutting, the upper limit of the steel material thickness is preferably 100 mm, although it depends on the output characteristics.
Claims (8)
- 質量%で、Si:0.06~0.20%、P:0.010~0.033%、Al:0.02%を超えて0.08%以下を含有し、P/Si≧0.12で、かつAl/Si≦0.60を満足する化学組成を有し、表面にスケールを有する鋼材であって、
スケール中にSiが0.4%以上のSi濃化域が層状に存在し、Si濃化域の表層側にAl/Si比が0.3以上のAl濃化域が層状に存在することを特徴とする酸素を用いた熱切断用鋼材。 In mass%, Si: 0.06 to 0.20%, P: 0.010 to 0.033%, Al: more than 0.02% and 0.08% or less, and P / Si ≧ 0.00. 12 having a chemical composition satisfying Al / Si ≦ 0.60 and having a scale on the surface,
In the scale, there is a layer of Si-concentrated regions in which Si is 0.4% or more, and an Al-concentrated region in which the Al / Si ratio is 0.3 or more exists in layers on the surface side of the Si-concentrated region. A steel material for thermal cutting using oxygen. - 質量%で、C:0.02~0.20%、Si:0.06~0.20%、Mn:0.20~1.60%、P:0.010~0.033%、S:0.015%以下、Al:0.02%を超えて0.08%、Cu:0.01%以上0.5%未満、Ni:0.01~0.5%およびN:0.009%以下を含み、残部がFeおよび不純物からなる化学組成を有することを特徴とする請求項1に記載の酸素を用いた熱切断用鋼材。 C: 0.02 to 0.20%, Si: 0.06 to 0.20%, Mn: 0.20 to 1.60%, P: 0.010 to 0.033%, S: 0.015% or less, Al: more than 0.02% and 0.08%, Cu: 0.01% or more and less than 0.5%, Ni: 0.01 to 0.5% and N: 0.009% The steel for thermal cutting using oxygen according to claim 1, characterized in that the remainder has a chemical composition consisting of Fe and impurities.
- 鋼材の化学組成が、Feの一部に代えて、質量%で、さらに、Ti:0.05%以下およびV:0.05%以下の一方または両方を含有することを特徴とする請求項2に記載の酸素を用いた熱切断用鋼材。 The chemical composition of the steel material is, instead of a part of Fe, in mass%, and further contains one or both of Ti: 0.05% or less and V: 0.05% or less. Steel material for thermal cutting using oxygen described in 1.
- 鋼材の化学組成が、Feの一部に代えて、質量%で、さらに、Cr:2.0%以下を含有することを特徴とする請求項2または請求項3に記載の酸素を用いた熱切断用鋼材。 The heat | fever using oxygen of Claim 2 or Claim 3 which replaces a part of Fe with the chemical composition of steel materials, and contains Cr: 2.0% or less further by the mass%. Steel for cutting.
- 鋼材の化学組成が、Feの一部に代えて、質量%で、さらに、Mo:0.5%以下、W:0.4%以下およびNb:0.04%以下から選択される1種以上を含有することを特徴とする請求項2から請求項4までのいずれかに記載の酸素を用いた熱切断用鋼材。 The chemical composition of the steel material is one or more selected from mass% instead of part of Fe, and further selected from Mo: 0.5% or less, W: 0.4% or less, and Nb: 0.04% or less. The steel material for thermal cutting using oxygen according to any one of claims 2 to 4, wherein the steel material contains oxygen.
- 鋼材の化学組成が、Feの一部に代えて、質量%で、さらに、B:0.003%以下を含有することを特徴とする請求項2から請求項5までのいずれかに記載の酸素を用いた熱切断用鋼材。 The oxygen composition according to any one of claims 2 to 5, wherein the chemical composition of the steel material includes, in place of a part of Fe, mass% and further B: 0.003% or less. Steel material for thermal cutting using
- 鋼材の化学組成が、Feの一部に代えて、質量%で、さらに、Ca:0.005%以下、Mg:0.005%以下およびREM:0.005%以下から選択される1種以上を含有することを特徴とする請求項2から請求項6までのいずれかに記載の酸素を用いた熱切断用鋼材。 The chemical composition of the steel material is one or more selected from mass% instead of part of Fe, and further selected from Ca: 0.005% or less, Mg: 0.005% or less, and REM: 0.005% or less. The steel material for thermal cutting using oxygen according to any one of claims 2 to 6, wherein the steel material contains oxygen.
- 鋼材の化学組成が、Feの一部に代えて、質量%で、さらに、Sn:0.50%以下を含有し、Cu:0.1%未満で、かつCu/Sn比が1.0以下であることを特徴とする請求項2から請求項7までのいずれかに記載の酸素を用いた熱切断用鋼材。 The chemical composition of the steel material is mass% instead of part of Fe, and further contains Sn: 0.50% or less, Cu: less than 0.1%, and the Cu / Sn ratio is 1.0 or less. The steel material for thermal cutting using oxygen according to any one of claims 2 to 7, wherein the steel material is for thermal cutting.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201180006781XA CN102712976A (en) | 2010-07-29 | 2011-07-25 | Steel material for thermal cutting using oxygen |
KR1020127011903A KR101393809B1 (en) | 2010-07-29 | 2011-07-25 | Steel material for thermal cutting using oxygen |
JP2012507490A JP5382203B2 (en) | 2010-07-29 | 2011-07-25 | Steel for thermal cutting using oxygen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010169954 | 2010-07-29 | ||
JP2010-169954 | 2010-07-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012014851A1 true WO2012014851A1 (en) | 2012-02-02 |
Family
ID=45530059
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2011/066874 WO2012014851A1 (en) | 2010-07-29 | 2011-07-25 | Steel material for thermal cutting using oxygen |
Country Status (4)
Country | Link |
---|---|
JP (1) | JP5382203B2 (en) |
KR (1) | KR101393809B1 (en) |
CN (1) | CN102712976A (en) |
WO (1) | WO2012014851A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013155422A (en) * | 2012-01-31 | 2013-08-15 | Nippon Steel & Sumitomo Metal Corp | Welded joint |
JP2020189301A (en) * | 2019-05-17 | 2020-11-26 | 日本製鉄株式会社 | Method for manufacturing steel material |
JP2020189300A (en) * | 2019-05-17 | 2020-11-26 | 日本製鉄株式会社 | Steel material |
JP2022512477A (en) * | 2018-12-13 | 2022-02-04 | アルセロールミタル | How to laser cut steel |
JP7445116B2 (en) | 2019-12-18 | 2024-03-07 | 日本製鉄株式会社 | thick steel plate |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002332541A (en) * | 2001-05-07 | 2002-11-22 | Nippon Steel Corp | Thick steel plate having good laser cuttability |
JP2006231363A (en) * | 2005-02-24 | 2006-09-07 | Jfe Steel Kk | Method for cutting-off steel plate by laser beam |
JP2008095155A (en) * | 2006-10-13 | 2008-04-24 | Sumitomo Metal Ind Ltd | Thick steel plate to be laser-cut and production method therefor |
JP2008208452A (en) * | 2007-01-31 | 2008-09-11 | Kobe Steel Ltd | Steel material having excellent corrosion resistance |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3555446B2 (en) * | 1998-06-01 | 2004-08-18 | Jfeスチール株式会社 | Thick steel plate with excellent laser cutting ability |
WO2009101951A1 (en) * | 2008-02-12 | 2009-08-20 | Sumitomo Metal Industries, Ltd. | Steel material for thermal cutting with oxygen |
-
2011
- 2011-07-25 CN CN201180006781XA patent/CN102712976A/en active Pending
- 2011-07-25 KR KR1020127011903A patent/KR101393809B1/en active IP Right Grant
- 2011-07-25 WO PCT/JP2011/066874 patent/WO2012014851A1/en active Application Filing
- 2011-07-25 JP JP2012507490A patent/JP5382203B2/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002332541A (en) * | 2001-05-07 | 2002-11-22 | Nippon Steel Corp | Thick steel plate having good laser cuttability |
JP2006231363A (en) * | 2005-02-24 | 2006-09-07 | Jfe Steel Kk | Method for cutting-off steel plate by laser beam |
JP2008095155A (en) * | 2006-10-13 | 2008-04-24 | Sumitomo Metal Ind Ltd | Thick steel plate to be laser-cut and production method therefor |
JP2008208452A (en) * | 2007-01-31 | 2008-09-11 | Kobe Steel Ltd | Steel material having excellent corrosion resistance |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013155422A (en) * | 2012-01-31 | 2013-08-15 | Nippon Steel & Sumitomo Metal Corp | Welded joint |
JP2022512477A (en) * | 2018-12-13 | 2022-02-04 | アルセロールミタル | How to laser cut steel |
JP2020189301A (en) * | 2019-05-17 | 2020-11-26 | 日本製鉄株式会社 | Method for manufacturing steel material |
JP2020189300A (en) * | 2019-05-17 | 2020-11-26 | 日本製鉄株式会社 | Steel material |
JP7252450B2 (en) | 2019-05-17 | 2023-04-05 | 日本製鉄株式会社 | Steel manufacturing method |
JP7315823B2 (en) | 2019-05-17 | 2023-07-27 | 日本製鉄株式会社 | steel material |
JP7445116B2 (en) | 2019-12-18 | 2024-03-07 | 日本製鉄株式会社 | thick steel plate |
Also Published As
Publication number | Publication date |
---|---|
JP5382203B2 (en) | 2014-01-08 |
JPWO2012014851A1 (en) | 2013-09-12 |
KR101393809B1 (en) | 2014-05-12 |
CN102712976A (en) | 2012-10-03 |
KR20120065445A (en) | 2012-06-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10744600B2 (en) | Metal plate for laser processing and method for producing stainless steel plate for laser processing | |
EP2100983B1 (en) | Ferritic stainless steel sheet for water heater excellent in corrosion resistance at welded part and steel sheet toughness | |
JP5652110B2 (en) | Steel plate excellent in laser cutting property and manufacturing method thereof | |
JP4702254B2 (en) | Thick steel plate for laser cutting and its manufacturing method | |
EP2180070A1 (en) | Process for manufacturing high-strength hot-rolled steel sheet | |
JP5987106B2 (en) | Ferritic stainless steel sheet excellent in punching workability and manufacturing method thereof | |
JP5382203B2 (en) | Steel for thermal cutting using oxygen | |
WO2010008019A1 (en) | Continuously cast slab and process for production of same | |
JP5720592B2 (en) | Welded joint | |
JP7277834B2 (en) | SOLID WIRE FOR WELDING ALUMINUM PLATED STEEL STEEL AND METHOD FOR MANUFACTURING WELD JOINT | |
WO2020059700A1 (en) | Ti-containing fe-ni-cr alloy having superior slitted surface quality | |
JP7425372B2 (en) | steel plate | |
WO2022030641A1 (en) | Steel plate | |
EP3156169A1 (en) | Buildup welded metal and machine structure | |
JP4389803B2 (en) | Steel sheet for laser cutting and its manufacturing method | |
JP6954976B2 (en) | High oxidation resistance Ni-Cr-Al alloy with excellent laser cutting properties and its manufacturing method | |
JP7445116B2 (en) | thick steel plate | |
JP4299709B2 (en) | Manufacturing method of thick steel plate with excellent laser cutting ability | |
JP2023064473A (en) | Steel plate, and manufacturing method thereof | |
JP2023128426A (en) | Thick steel plate and method for manufacturing the same | |
JP6462431B2 (en) | Overlay weld metal and machine structure | |
JP2020152941A (en) | Two-phase stainless steel, and method for manufacturing the same | |
JPH10195596A (en) | Steel plate excellent in laser beam cuttability | |
JP2003342685A (en) | Method for preventing surface crack in continuous casting of steel, and steel |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201180006781.X Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2012507490 Country of ref document: JP |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 11812440 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 20127011903 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 11812440 Country of ref document: EP Kind code of ref document: A1 |