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JP04309402 |
PURPOSE: To obtain the seamless steel pipe having the performance equal to the performance of a SUS 304 stainless steel by using a SUS 304L stainless steel without executing a soln. heat treatment. CONSTITUTION: This invention relates to...
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JP04305302 |
PURPOSE: To control the variation of grain size of a steel tube which is manufactured by executing solid solution heat treatment by directly electrically heating the steel tube which is cold-rolled with a Pilger mill. CONSTITUTION: Befor...
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JP04301033 |
PURPOSE: To produce a small-diameter resistance welded tube of round or special shape having high strength and excellent in toughness and ductility. CONSTITUTION: This method is characterized by subjecting a resistance welded tube, produ...
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JP04294804 |
PURPOSE: To offer a means for restraining the generation of wrinkle-like defects on the outer surface when a solid billet is pierced by hot piercing rolling. CONSTITUTION: The solid billet 4 which is heated in a rotary hearth furnace 1 i...
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JP04294803 |
PURPOSE: To manufacture a tube at a low cost without generating high carbon concentration parts due to carburizing on the surface side of a tube stock and without decreasing productivity even if rolling with a mandrel mill is executed by...
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JP04238609 |
PURPOSE: To accurately manufacture the finishe-rolled tube with the target wall thickness. CONSTITUTION: On the stretch reduction of the tube on the continuous multi roll mill, the physically allowable applying max. tensile coefficient Z...
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JP04238608 |
PURPOSE: To accurately bring the wall thickness of finished tube into the target wall thickness on the stretch reduction of the steel tube after manufacturing on the stretch reduction process, etc. CONSTITUTION: The physically allowable ...
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JP04231105 |
PURPOSE: To embody elongating and rolling with the highest possible efficiency without the deterioration of quality with a smaller number of roll stands by minimizing the number of the roll stands as far as possible. CONSTITUTION: The ro...
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JP04220110 |
PURPOSE: To obtain a required shape by arranging stands to direct their side parts toward a specific direction and rolling a steel rod without twisting the steel rod. CONSTITUTION: The side parts of the rolls of the stands 13, 14 are arr...
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JP04220111 |
PURPOSE: To provide an apparatus for controlled cooling of cylindrical elements, such as metallic pipes in the outlet of a reducing mill, which progress in a longitudinal direction and a method for controlled cooling using the same appar...
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JP04197526 |
PURPOSE: To make an exclusive correcting machine needless, to improve the quality of the seamless steel tube and to reduce the manufacturing cost by arranging the optical nose bent quantity measuring device at the outlet side of the size...
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JP04190912 |
PURPOSE: To improve the accuracy of the dimension of outer diameter by relating the deviation of the outer diameter of rolled tube and the target outer diameter with the linear expression of the variation amount of the reduction position...
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JP04182009 |
PURPOSE: To prevent the generation of interior defect due to tube making by making the tip side of a mandrel bar for manufacturing seamless steel tube smaller than the reference diameter and connecting with the reference diameter part th...
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JP04178204 |
PURPOSE: To remove the carburized part due to the plug mill rolling while making the total cost minimum by specifying the thickness reducing amount of the plug mill and the rolling temperature of one pass time, and rolling by controlling...
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JP04172111 |
PURPOSE: To make the thick wall part uniform and to improve the yield by accelerating the velocity of the mandrel bar gradually over all term of the rolling work, making the max. speed at the finishing time of the rolling and operating t...
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JP04168221 |
PURPOSE: To improve the intergranular corrosion resistance of an austenitic stainless seamless steel tube by rolling the stock for finish rolling in a specified atmosphere in a specified temp. range. CONSTITUTION: In the manufacture of a...
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JP04162901 |
PURPOSE: To stabilize piercing operation by controlling the speed of a driving rolling roll so that the outside diameter of biting part of material in piercing rolling with press roll is less than the target value. CONSTITUTION: In pierc...
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JP04158906 |
PURPOSE: To make the wall thickness of a finished tube the target wall thickness with high accuracy by determining the max. tensile modulus of each stand and executing reducing rolling in tensile modulus at a specified rate of the max. d...
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JP04158907 |
PURPOSE: To finish the inside surface of a finished tube into approximately complete circle and with high dimensional accuracy by successively arranging the plural sets of roll groups in stands of which reduction rate of tube are specifi...
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JP04138812 |
PURPOSE: To surely and effectively control the wall thickness at the time of a tube end rolling by properly controlling the number of revolution control beginning timing of the tube end rolling time at each roll stand, the time differenc...
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JP04111907 |
PURPOSE: To allow the complete removal of a residual lubricant and high-carbon concn. layer and to inexpensively produce the austenitic stainless seamless steel pipe without generating rolling defects and flaws by removing the inside sur...
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JP04105705 |
PURPOSE: To prevent seizure, surface flaw of a tube stock and to prevent a roll from wear and the life from lowering by removing the flow of cooling water with a dewatering plate provided on the inlet side of a rolled stock of a caliber ...
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JP04094806 |
PURPOSE: To improve the yield of product by determining and compensating the fluctuation quantity of impact speed by providing a means for detecting timing that a shell is bitten into a mandrel mill in a speed controller for mandrel bar....
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JP04091806 |
PURPOSE: To prevent seizure and the generation of flaws on a tube stock surface and to decrease roll wear so as to prevent the shortening of a roll life by supplying a lubricant in the entire area of the contact part between a hollow tub...
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JP04089121 |
PURPOSE: To control the fluctuation in the thickness of a seamless steel pipe and to improve the dimensional accuracy thereof by dealing with the fluctuation in a mandrel bar by tracing of a tracking means and dealing with the size distr...
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JP04084624 |
PURPOSE: To decide the presence or absence of the perforation generated in a material to be rolled during rolling by sending a signal from a comparator to a decision circuit to emit an alarm when the fluctuation level of load exceeds the...
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JP04084610 |
PURPOSE: To obtain a thin steel tube of high out-of-roundness without correcting means by keeping that posture to a required temp. after rolling by arranging an elliptic caliber which is elliptic in the vertical direction in at least the...
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JP04080350 |
PURPOSE: To produce a low Cr-Mo seamless steel tube excellent in high temp. strength and workability by the process simpler than conventional one by reheating a tube stock for finish rolling having a specific composition up to specific t...
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JP04052226 |
PURPOSE: To produce a high strength seamless steel tube by forming a round billet into a tube stock by means of hot piercing rolling, exerting heat treatment under specific conditions, performing outside diameter drawing, and then carryi...
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JP04052010 |
PURPOSE: To make the distribution of wall thickness uniform by rolling a tubing by opening roll gap stand by a specified distance more than the roll gap at the time of stable rolling when the specified ranges of the top end and rear end ...
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JP04046620 |
PURPOSE: To remove the tension applying to the welded part and to prevent the tube from breaking or shape being bad by reducing the speed of the downstream stand at the timing that the position of the welded part of pipe reaches just und...
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JP04041006 |
PURPOSE: To manufacture a high quality, seamless square steel tube irrespective of thickness and size by piercing a billet, then, rolling it to obtain a tube stock of circular section, reducing its section to a required section through a...
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JP04022502 |
PURPOSE: To restrain the wear and surface roughening of caliber roll by continuously spraying the lubricant between a caliber roll of which the hardness is ≥60 in Shore hardness as the caliber roll of a mandrel mill and a tube stock fr...
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JP04013401 |
PURPOSE: To drastically improve the nose bend of the tip of a seamless tube by inserting a mandrel into the inner part to perform sizing in passing a sizer, in the sizing executed after passing a reeler in the manufacture of the seamless...
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JP04013402 |
PURPOSE: To drastically improve the nose bend at the tip of a seamless tube by opening the roll gap more largely than a set value in advance when the tip of a tube stock passes and closing the roll gap down to the set value for sizing di...
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JP04004905 |
PURPOSE: To offer the reducing rolling method of steel pipe in cold by which obtaining large elongation stably by rolling by specifying the ratio of the outside diameter of main pipe to the diameter of the groove bottom of roll. CONSTITU...
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JP03294008 |
PURPOSE: To obtain a product tube high in cold drawing accuracy by making the interval between roll shafts adjustable to two of three rolls and further and sliding the rolls in the directions of the roll shaft centers to adjust and agree...
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JP03291109 |
PURPOSE: To prevent the generation of the error of outside diameter due to the wear of caliber roll by determining wear quantity that is caused on the caliber roll of a prescribed stand and correcting the drawing down position based on t...
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JP03285702 |
PURPOSE: To reduce the variation in the length of seamless tube by determining the roll gap of a 2nd pass based on the weight of billet that is estimated based on the rolling result of a 1st pass and performing the rolling of the 2nd pas...
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JP03267316 |
PURPOSE: To mass-produce a steel tube having a uniform superfine structure by performing rolling by means of a stretch reducing mill while specifying stretching ratio and temp. region and utilizing the temp. increase by plastic working, ...
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JP03258405 |
PURPOSE: To make rapid and proper measure to abnormal rolling possible by deciding that it is normal rolling in the case rolling load is lowered by a certain level of load value after recording a peak value and that other cases are abnor...
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JP03258408 |
PURPOSE: To obtain a high-quality pipe by starting the rolling of a shell by adding a required compensation quantity on a set speed and getting it back to the original set speed when the drop time elapses. CONSTITUTION: Before the start ...
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JP03210905 |
PURPOSE: To improve the accuracy of film thickness by controlling the speed of a mandrel bar while controlling the supply quantity based on the measured value of the film thickness of lubricant which is applied on the surface of the mand...
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JP03198901 |
PURPOSE: To manufacture a steel tube with a wall thickness of a high accuracy by shortening control pitch by giving the variance of revolving speed corresponding to the variation of thickness of base material at each stand of a stretch r...
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JP03193203 |
PURPOSE: To manufacture a titanium hollow shell without internal defects by controlling the heating temp. and elongation ratio of a base material to be pierced within a specified range in the case that a titanium billet is pierced with a...
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JP03169409 |
PURPOSE: To form a shell as a prescribed target by comparing a measured wall thickness with a set value of the wall thickness of tube that is preliminarily stored, operating the difference of the both and changing the stretch factor of r...
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JP03169408 |
PURPOSE: To control a mandrel bar in proper insertion position by measuring the ejecting quantity of the mandrel bar when seamless steel tube is rolled with a mandrel mill and comparing that measured quantity with the ejecting quantity t...
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JP03155407 |
PURPOSE: To reduce the load of a computer and to suppress the thickness to improve the quality of a tube by detecting the transition point between a stationary rolling state and a transient rolling state and changing a preset quantity of...
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JP03151102 |
PURPOSE: To restrain the thickness at both ends from increasing and to improve the yield by estimating and operating unstable tensions and learning-controlling the following controlled variable at tube ends rolled in accordance with a de...
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JP03146206 |
PURPOSE: To prevent the seizure of rolls or tripping of driving and to prevent the generation of a defect in thickness and diameter by actually measuring the shell speed just before a shell is bitten in a sizer and controlling the roll s...
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