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JPWO2007100042A1 |
In addition to containing 8.0 to 16.0% of Cr in mass%, the element symbol is the content in steel in mass% of each component element, using the formula "Cr + 4Si- (22C + 0.5Mn + 1.5Ni + 30N)". A billet whose value is 9.0% or less is set ...
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JP4301133B2 |
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JP4279350B1 |
A piercing and rolling plug has a film composed of oxides such as Fe 3 O 4 and FeO and Fe (metal) as being formed on the surface of the base metal by electric arc spraying using an iron wire whose main component is Fe and, owing to this ...
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JP2009125784A |
To provide a hump capable of reducing an undulation formed on the outside surface of a product by changing the chamfered shape of the rear end part of a roll for an Assel mill.In a roll for an Assel mill, a hump of the roll prevents gene...
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JP4276480B2 |
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JP4259347B2 |
A non-heat treated seamless steel pipe comprising, by weight, C: 0.10 to 0.25%, Si: 0.05 to 1.00%, Mn: 0.50 to 2.50%, P: not more than 0.03%, S: not more than 0.05%, Cr: 0.40 to 1.50%, Mo: 0.05 to 1.50%, V: 0.02 to 0.30%, Al: 0.003 to 0....
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JP4255991B2 |
An annular workpiece 6 is rolled between two oppositely disposed forming rolls 2, 4, and two oppositely disposed growth rolls 22 and 24 acting at right angles to the line of action of the forming rolls. The forming rolls 2, 4, are brough...
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JP2009066644A |
To provide a piercer boring method of a hard-to-work material capable of preventing generation of inner flaw when performing the piercer boring of the hard-to-work material.In the piercer boring method for manufacturing a seamless steel ...
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JP4238744B2 |
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JP4231631B2 |
Rolling mill comprises a roll stand (4) consisting of opposite-lying portal frames (7, 8) fixed to a plate (6) with an upper cassette (9) for an upper rolling unit (11) and a lower cassette for a lower rolling unit (12). Both frames are ...
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JP4200829B2 |
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JP4196991B2 |
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JP4169858B2 |
The invention refers to a process for the production of hot-finished tube of carbon, alloyed and high-alloy steels, in particular tubing for antifriction bearings, during which pretreated and degassed as well as deoxidised liquid steel o...
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JP4155267B2 |
The present invention relates to a making method for a seamless metallic tube with a tilting roll type piercing rolling mill (piercer). According to the making method for a seamless metallic tube of the present invention, the rotary forg...
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JP4150585B2 |
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JP4145764B2 |
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JP4133103B2 |
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JP4126979B2 |
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JP2008161912A |
To provide a method of manufacturing seamless steel tubes by which the deterioration of surface roughening is deterred without damaging the biting property of barrel-shaped rolling rolls.This method of manufacturing the seamless tubes is...
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JP4117955B2 |
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JP4107199B2 |
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JP2008137026A |
To provide a barreled rolling roll for inclined rolling mill and a method for manufacturing a seamless steel pipe, capable of relaxing the generation of a flaw caused by a knurling.The barreled rolling roll provided with the ball head re...
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JP4103082B2 |
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JP4094462B2 |
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JP4059099B2 |
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JP4051918B2 |
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JP4045813B2 |
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JP4000738B2 |
To obtain a lubricant capable of prolonging the life of a plug for piercing rolling a seamless steel pipe and to provide a method for piercing rolling a seamless steel pipe using this lubricant. The lubricant is composed of 1-10% of a gr...
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JP2007260685A |
To provide a piercer plug and a piercing and rolling method by which the life of the piercer plug is lengthened and also the occurrence of slip or miss roll during piercing and rolling is prevented. In this piercer plug 3, the coefficien...
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JP2007229795A |
To provide barrel-shaped piercer rolls with which shearing strain in the circumferential direction is reduced. In these barrel-shaped piercer rolls for reducing shearing strain in the circumferential direction, when piercing a billet by ...
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JP2007526133A |
An apparatus comprises a rotating member having one or more rollers. The one or more rollers have a plurality of protuberances. The rollers may be advanced toward a surface during rotation of the rotating member, such as toward a bore su...
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JP3959667B2 |
To manufacture a high-strength steel pipe which restrains inner flaws from being caused and which is excellent in resistance to sulfide, stress and corrosion cracking. Seemless pipes are manufactured by the direct hot rolling of billets ...
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JP3921808B2 |
To provide a method for producing a martensitic stainless steel tube having high strength of >650 MPa yield stress and having excellent low temp. toughness. Martensitic stainless steel having a compsn. contg., by weight, 0.15 to 0.22% C,...
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JP3921809B2 |
To provide a method of manufacturing a martensitic stainless steel tube having high strength of which the yield stress exceeds 650 MPa and also having excellent toughness at a low temperature. After martensitic stainless steel which has ...
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JP3855300B2 |
To provide a method for efficiently producing on-line a seamless steel pipe excellent in the performance, and also provide an on-line equipment therefor having apparatuses from casting to heat treatment. This production method comprises ...
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JP2006297400A |
To provide a piercing method in the manufacture of a seamless steel tube having no flaw on the inner and outer surfaces.In the piercing method of the seamless steel tube in a manufacturing method of the seamless steel tube, the generatio...
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JP2006281283A |
To provide an Assel mill rolling method for preventing the generation of thickness deviation in a steel tube.In this Assel mill rolling method for preventing the generation of the thickness deviation of the steel tube, the thickness devi...
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JP3823762B2 |
To provide a production method for a seamless steel pipe which controls Mannesmann destruction and circumferential shearing strain and produces a product having less inner roll marks with a high productivity. A plug as shown in Fig. 3 is...
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JP3820896B2 |
To provide an inclined rolling machine for a seamless pipe and a rolling method thereof by which the baking of a disc roll comprising the inclined rolling machine can be suppressed, and the fault of a guide mark can be reduced. In rollin...
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JP3785916B2 |
To provide a method for rolling a seamless steel pipe capable of suppressing the generation of non-uniform thickness, and rolling high quality hollow pipes in the method which performs, holding a hollow pipe with a holding device, a roll...
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JP3785930B2 |
To accurately detect the generation of end-blocking deemed undetectable. A device for detecting a slip is provided with: a detecting means 14 for a driving torque current of the main roll of a piercer, a detecting means 18 for a driving ...
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JP3777997B2 |
To provide a manufacturing method of a seamless steel tube which is excellent in quality of internal surface. This method is a method for manufacturing the seamless tube by piercing a billet by using a plug on the surface of which a scal...
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JP2006116584A |
To provide a manufacturing method of a seamless steel tube by Mannesmann piercing process by which thickness deviation and deterioration of biting ability are prevented and the generation of inside surface flaws is decreased in the manuf...
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JP3738660B2 |
To provide a martensitic seamless stainless steel pipe whose surface is provided with scale excellent in adhesion and to provide its producing method. This martensitic seamless stainless steel pipe contains, by mass, 0.2 to 0.5% Ni and 9...
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JP3692597B2 |
To reduce the defective ratio of a hollow stock tube and to improve the yield by predicting the fusing damage of the tip part of a plug based on the measured result of a measuring means of a billet progressing velocity and a measuring me...
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JP2005211911A |
To provide a method for preventing the end crack of a seamless steel pipe in straightening the steel pipe.The method for preventing the end crack in straightening the steel pipe performs roll straightening by heating the steel pipe end b...
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JP2005211912A |
To provide a method for preventing any uneven thickness of a seamless steel tube.In the uneven thickness preventive method of a seamless steel tube, the amplitude of a mandrel during the drilling is measured in a seamless steel tube manu...
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JP2005211920A |
To lighten the load at boring time of a seamless steel pipe with skew rolling, by that linear segregation except the central part in a bloom with a continuous casting is lightened to form only the center segregation and easily perform th...
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JP2005211973A |
To provide a method for minimizing the inside surface flaws of a steel pipe obtained by regulating the relationship between the distribution form and amount of the porosities of a round steel billet which must be controlled by various fa...
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JP2005163167A |
To provide a rotary hearth equipment in a seamless steel tube manufacturing line, and a seamless steel tube manufacturing method using the same.In the rotary hearth equipment in the seamless steel tube manufacturing line, a billet is lif...
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