47results about How to "Improve the billet rate" patented technology

A continuous casting billet of low-carbon and high-sulphur free-cutting constructional steel production method with the following properties: (1) primary smelting: tapping with degree of oxygen activity of 700ppm, adding right amount Al when tapping of 20% and refinery cinder when tapping of 90%; (2) molten steel refining in LF refined-smelting ladle furnace: (A) deoxidising on top of the slag: agitating and blowing argon from bottom with pressure of 0.5MPa and analyzing sample and adjusting components after energizing for 10 minutes; (B) slag refining: adding 58%CaO,11%Al2O3, 9%SiO2 and 8 %MgO to get degree of oxygen activity of 60ppm; (C) closing argon from bottom when temperature of molten steel is 90 Deg.C more than liquidus line temperature, and feeding sulfur core-spun yarn rapidly. (3) continuous casting: (A) casting rate rationally, such as square continuous casting billet with casting rate of 2m/min; (B) roller pressure of every sedan at the end of conticaster is different from that of 10Bar; (C) setting rational continuous casting technical parameter. Continuous casting billet, which is made by steel of many pattern numbers such as 1213 and 1215, possesses the properties of high stabilization of component, good continuous casting, low cost of manufacture, high quality of casting blank (which meets the rolling request of subsequent heat working) and profound economic benefit.

The invention belongs to a cooling casting blank or casting mould device and relates to a water cooling channel for a large beam blank continuous casting crystallizer,,and particularly to a copper plate cooling device for a beam blank continuous casting crystallizer. The copper plate cooling channel is characterized in that: a web water gap, a R angle water gap, a bevel water gap, a flange inner angle water hole and a flange top water hole are formed on a broadside copper plate according to the characteristics of the copper plate shape and heat face heat flux; the water gaps without corners are distributed uniformly, and the water gaps at R angle are dense, and few water holes are arranged at concave corners; and a cooling water tank is arranged outside a narrow side copper plate. The copper plate cooling channel has the advantages that cooling water channels are arranged in areas, the number of cooling water channels is reduced, water gap diameter is reduced, and processing quantity is reduced; the water gaps are arranged reasonably, temperature peak value at the R angle is eliminated, the temperature gradient is reduced, the cooling strength of the flange top is weakened, the overall temperature of the copper plate tends to be uniform, the working environment of the copper plate and blank heat transmission condition are improved, the cooling effect is good, and water is saved; deformation and abrasion of the copper plate are reduced, and service life is prolonged; the surface quality of blanks is remarkably improved, the cogging yield is improved, and continuous casting production can be performed smoothly.

A rolling cogging manufacturing method for high temperature alloy GH1015 includes: 1) heating in one heat, electroslag ingot keeping temperature for 1 hr with entering furnace temperature is less than or equal to 700deg.C, keeping temperature for1 hr with is less than or equal to 60deg.C/h up to 900deg.C, keeping temperature for 3.5 hrs with is less than or equal to 80deg.C/h up to 1180deg.C and drawing charge with positive and negative face temperature differential is less than or equal to 20deg.C; 2) cogging in one heat with preheating temperature of roller 120deg.C and beginning temperature is greater than or equal to 1100deg.C, finishing temperature is greater than or equal to 1000deg.C, roller speed is less than or equal to 20/min, drafts is less than or equal to 30mm and rolling passage is less than or equal to 15; 3) heating in second heat, keeping temperature for 80 mins at 1170deg.C and drawing charge with positive and negative face temperature differential is less than or equal to 20deg.C; 4) cogging in second heat and roller preheating with beginning temperature is greater than or equal to 1100deg.C, finishing temperature is greater than or equal to 1000deg.C, rolling speed is less than or equal to 20/min, rolling speed of product passage is less than or equal to 10/min and drafts 30mm. It achieves low cost, simple process and good quality.

A rolling cogging manufacturing method for X210CrW12 steel ingot includes: 1) heating by uniform heating furnace, keeping temperature for 150 mins with entering temperature of steel ingot is less than or equal to 450deg.C, heating to 1170deg.C and keeping temperature for 4.5 hrs with speed is less than or equal to 80deg.C/h, turning over steel ingot and drawing charge with positive and negative face temperature differential is less than or equal to 25deg.C; 2) rolling by rolling mill, closing cooled water of roller before rolling and roller preheating; first rolling with roller speed is less than or equal to 20/min, beginning temperature is greater than or equal to 1130deg.C, finishing temperature is greater than or equal to 1060deg.C, rolling passage 40 and drafts is less than or equal to 30mm; billet melting down and distressing annealing heat treating. It achieves low cost, simple process and good quality.

A rolling cogging manufacturing method for 0Cr17Ni4Cu4Nb ingot casting includes: 1) heating in one heat, cooling steel ingot and keeping temperature for 1.5 hr when entering furnace temperature is less than or equal to 600deg.C; heating steel ingot, keeping temperature for 1 hr when entering furnace temperature is less than or equal to 690deg.C and keeping temperature for 2 hrs with is less than or equal to 60deg.C/h up to 950deg.C, keeping temperature for 4 hrs with is less than or equal to 80deg.C/h up to 1180deg.C and drawing charge with positive and positive and negative face temperature differential is less than or equal to 30deg.C; 2) cogging in one heat, roller preheating with rolling speed is less than or equal to 10/min, beginning temperature is greater than or equal to 1150deg.C, finishing temperature is greater than or equal to 1050deg.C, drafts is less than or equal to 40mm and rolling passage is less than or equal to 14; 3) heating in second heat and keeping temperature for 1 hr at 1180deg.C; 4) cogging in second heat with beginning temperature is greater than or equal to 1130deg.C, finishing temperature is greater than or equal to 1000deg.C and drafts is less than or equal to 50mm, rapid shearing billet and hot annealing. It achieves low cost, simple process and good quality.

The present invention relates to continuous metal casting, and is especially special billet casting ladle and its casting process. The present invention includes one ladle and a crystallizer and features the ladle with at least two spouts with fast replacing mechanism including upper sliding spout and lower sliding spout and connected to the ladle spout and the immersed spout inserted into the crystallizer. During casting, molten steel flows through sealed channel to avoid secondary oxidation and improve billet quality. The fast spout replacing mechanism regulates the flow rate of molten steel and the level inside the crystallizer to reduce adhesion and leakage. The fast spout replacement can increase the continuous cast crystallizer number, reduce ladle number, lower consumption and raise billet quality.

The invention discloses a continuous-casting big round billet dissimilar steel mixed casting production method. The method comprises the following steps that when molten steel of a prior melt is casted into a medium ladle, a certain amount of molten steel is left in a big ladle of the melt, and the casting speed is decreased; when the molten steel, left in the medium ladle, of the prior melt is decreased to a certain liquid level, casting is started on a big ladle of molten steel of a later melt, and a steel ladle covering agent in the medium ladle is replaced; after the big ladle of the latermelt is cast for a certain time, covering slag of a crystallizer is replaced; after the big ladle of the later melt is cast for 25 t, the liquid level of the medium ladle is kept, and the casting speed is increased; after the big ladle of the later melt is cast for 30 t, the liquid level of the medium ladle is slowly increased to the normal full liquid level, and then casting is conducted; and after the big ladle of the later melt is cast for 40 t, the casting speed is decreased to that corresponding to normal superheat degree, and then normal casting is conducted. According to the continuous-casting big round billet dissimilar steel mixed casting production method, when dissimilar steel is produced in the same medium ladle in a continuous casting manner, the thermal shutdown time can beshortened, the production efficiency of a continuous casting machine can be met, and the continuous casting billet yield can be increased.

The invention relates to a production method for rolling and cogging a big cast ingot of high-carbon high-alloy cold-working die steel. The production method comprises 1) hot charging the cast ingot of high-carbon high-alloy cold-working die steel; 2) homogenizing in a soaking pit including a first fire cast ingot heating procedure, which comprises (A) charging the cast ingot at temperature of 600-800 DEG C, and keeping warm for 100-150 minutes; (B) raising the temperature to 1,100-lower than 1,200 DEG C; (C) at the temperature of 1,100-lower than 1,200 DEG C, incubating for 2-5 hours; and (D) keeping the temperature difference of the female face and male face of the cast ingot smaller than 50 DEG C; and a second fire rolled piece melt-down heating, which comprises (A) heating and raising the temperature to 1,100-lower than 1,200 DEG C, and incubating for 2-3 hours; (B) keeping the temperature difference of the female face and male face of the cast ingot smaller than 50 DEG C; and 3) after the two heating procedures, respectively carrying out rolling; wherein (A) the preheating temperature of a roller is 100-200 DEG C; (B) initial rolling temperature is 1,100- lower than 1,200 DEG C, and the final rolling temperature is higher than 900 DEG C; and (C) the biting speed of the roller is 10-40r/min. The production method has the advantages that the process is simple; the ingot mold of the cast ingot is enlarged, and the production cycle is greatly shortened; the energy consumption is greatly reduced; and the cogging yield is increased.

The invention belongs to the metallurgical industry, and particularly relates to a super duplex stainless steel ingot hot working cogging method. The methods comprises hot working cogging first fire rolling and hot working cogging second fire rolling. The method comprises the steps of heating a steel ingot with a soaking pit, hot working cogging with a blooming mill, heating a rolled piece with the soaking pit, and hot working second fire cogging with the blooming mill. According to the super duplex stainless steel ingot hot working cogging method, a forging press is replaced by the blooming mill for hot working cogging, a qualified 2507 billet is rolled for being further rolled into a seamless tube circular tube billet, the problems of long production period and low metal cogging yield are solved, production cost of metallurgy manufacturing is greatly reduced, and user requirements and market demands are met.

The invention discloses high-carbon high-chromium stainless steel and a processing method thereof and relates to the technical field of stainless steel processing. The processing method of the high-carbon high-chromium stainless steel comprises the following steps: performing mold and cap red transferring on high-carbon high-chromium stainless steel ingots, performing mold and cap removal, puttinginto a furnace, heating, and performing primary rolling on the heated ingots, wherein different heating and heat-preservation processes are selected according to different temperatures of the ingotswhen the ingots are put into the furnace and heated. The processing method of the high-carbon high-chromium stainless steel, which is disclosed by the invention, has the advantages of being simple inprocess, low in production cost and high in blank rate, and the produced stainless steel is good in physical and chemical property. The invention further relates to the high-carbon high-chromium stainless steel produced by using the processing method.

The present invention discloses a production method of valve steel billet. It is characterized by that said production method adopts a hot-working cogging process of 'using continuous heating furnace to heat steel ingot and utilizing rolling mill to roll in one heat'.

The invention provides a high-Mo Ni-based alloy sheet with width larger than or equal to 1000 mm. The alloy comprises components in percentage by weight as follows: 0.006%-0.010% of C, 15.0%-16.5% ofMo, 15.0%-16.5% of Cr, 5.0%-7.0% of Fe, smaller than or equal to 0.05% of Co, 3.0%-4.0% of W, smaller than or equal to 0.10% of V, smaller than or equal to 0.08% of Si, smaller than or equal to 0.8% of Mn, smaller than or equal to 0.01% of P, smaller than or equal to 0.008% of S, 0.10%-0.30% of Al, smaller than or equal to 0.002% of O, 0.001%-0.010% of Mg, 0.001%-0.010% of Ce+La and the balance ofNi and inevitable impurities.

The invention relates to a method for straightening a bent and deformed square billet in the technical field of continuous casting, in particular to a method for straightening the bent square billet. The method includes the following steps that firstly, a plate billet is laid below the bent billet, and the length of the plate billet is larger than or equal to the length of the bent billet; secondly, the square billet is horizontally laid on the plate billet with the bent face facing upwards, and one or more plate billets with the same length are laid on the bent billet; thirdly, the starting temperature of the plate billets is more than 7000 DEG C, and the plate billets are naturally cooled, and pressing is kept for at least four hours. According to the method, operation is easy and convenient, the billet yield of the continuous billet is increased, and the production cost is saved.

The invention discloses a method for measuring the net weight of molten steel in a steel ladle. The method includes the steps that the pouring time of the steel ladle is recorded; the steel pulling speed of a steel pulling machine is detected to serve as the flow speed analog quantity of the poured molten steel; the width of a billet on the steel pulling machine is detected to serve as the width analog quantity of the poured molten steel, and the thickness of the billet on the steel pulling machine is detected to serve as the thickness analog quantity of the poured molten steel; and the net weight of the poured molten steel is calculated in real time according to the flow speed analog quantity, the width analog quantity and the thickness analog quantity of the poured molten steel, the pouring time and the density of the molten steel. By means of the method for measuring the net weight of the molten steel in the steel ladle, the problem that the net weight of the molten steel cannot beaccurately acquired under the condition that a weighing sensor is ineffective or the error is large is solved. Meanwhile, the method for measuring the net weight of the molten steel in the steel ladlemonitors the net weight of the poured molten steel in the steel ladle in real time, the accuracy of measured data of the net weight of the molten steel is guaranteed, stable operation of the site pouring technology is guaranteed, roughing slag of the molten steel is also avoided, the billet forming rate of the molten steel and the percent of pass of casting blanks are increased, and therefore economic benefits are increased.

The invention discloses a hot rolling method of a niobium-containing austenitic stainless steel profile. The hot rolling method sequentially comprises the following steps: (1) casting refined molten steel into a steel ingot with a preset size; (2) heating the steel ingot and preserving heat for a certain time; and (3) cogging and rolling the steel ingot according to the set parameters. According to the hot rolling method, the cracking problem of the niobium-containing austenitic stainless steel profile is solved, the product quality and the production efficiency are improved, and the production cost is reduced.