CN102821887A - Method for suppressing surface indentation flaw in element tube for seamless steel tube - Google Patents
Method for suppressing surface indentation flaw in element tube for seamless steel tube Download PDFInfo
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- CN102821887A CN102821887A CN2011800155721A CN201180015572A CN102821887A CN 102821887 A CN102821887 A CN 102821887A CN 2011800155721 A CN2011800155721 A CN 2011800155721A CN 201180015572 A CN201180015572 A CN 201180015572A CN 102821887 A CN102821887 A CN 102821887A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
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Abstract
The present invention provides a method for suppressing a surface indentation flaw in an element tube for a seamless steel tube. An element tube (an element tube for a seamless steel tube) to which straightening by a straightener is applied after heat-transferred and tube-made, and which is then submitted to cold working, wherein, during the straightening by the straightener, cooling water is sprayed all over the surfaces of rolls (1a, 1b) constituting the straightener, and soft reduction is applied to the element tube with the loads added to the straightener rolls (1a, 1b) as 550 kN or less, thereby making it possible to effectively suppress surface indentation flaws occurring in the element tube for the seamless steel tube. It is effective as a means for the soft reduction to use a hot straightener for adding straightening such as bend removal to the element tube in a temperature range of 500-550 DEG C inclusive after heat-transferred and tube-made. It is desirable to perform the spraying of the cooling water all over the surfaces of the rolls (1a, 1b) by one or more means of the increased wide angle of the tip shape of cooling water nozzles, the proper arrangement of the cooling water nozzles, and an increase in the water volume of cooling water to be sprayed.
Description
Technical field
The present invention relates to the inhibition method of a kind of seamless steel pipe with the outer surface impression defective of pipe.At length say, relate to a kind of through implement correcting, being used for afterwards the inhibition method of the outer surface impression defective of cold worked pipes such as cold-drawn after Mannesmann-tubulation is carried out in oblique millings such as mandrel mill tubulation method, by straightener.
Short of record separately, the definition of the term in this specification is following.
" seamless steel pipe is used pipe ": be meant as high-temperature high-pressure boiler to have the process cold working such as structural steel pipe of high dimension precision with steel pipe or requirement and the steel pipe of the blank of the seamless steel pipe made (that is, hot tubulation (utilizing hot-working to carry out tubulation) form seamless steel pipe).Below, also only be called " pipe ".
" outer surface impression defective ": be meant the oxide skin that when hot tubulation, generated attached on the surface of pipe, the roller surface, these oxide skins when utilizing straightener to correct by roller by on the surface that is pressed in pipe and the defective that produces.Sometimes oxide skin does not come off and left behind at that.It is and has irregular concavo-convex textured.Below, also only be called " impression defective ".
" thermal straightening machine ": be meant to apply the straightener of removing under the situation that bending etc. corrects to being in pipe in 500 ℃～550 ℃ the temperature range behind the hot tubulation.In addition, " straightener " refers to the cross roll formula straightener that combination has the roller of a plurality of drum shapes.Usually, this straightener have 3 pairs～5 pairs with the direction of rotation state intersected with each other on the above-below direction relatively the roller of configuration (with reference to after Fig. 2 of stating).
Background technology
The seamless steel pipe that hot tubulation forms has the senior pipe used etc. as used in nuclear power station, high-temperature high-pressure boiler, require to have the situation of the structural steel pipe of high dimension precision, also is applied to situation such as other specific use.Under above-mentioned situation, the pipe that the seamless steel pipe that hot tubulation forms is used with the seamless steel pipe of steel pipe etc. as senior pipe, high-precision configuration and be used for cold-drawn cold working such as (drawings).
For example; Various cylinder bodies (being called the piston reciprocating hollow cylinder of portion portion within it) also are to constitute by carry out the seamless steel pipe that cold-drawn processing obtained through the seamless steel pipe that hot tubulation is formed; The pipe that the cylinder body that forms at this hot tubulation is used is (owing to be used for cold-drawn processing; Therefore note below is done " cylinder body is used the drawing pipe ") in, except requiring to have the high dimension precision, also require to have surface characteristic attractive in appearance.But, cylinder body with the drawing pipe in, tend to find to have produced outer surface impression defective.Therefore, in the pipe stage, the degree of depth that is surface indentation defective outside is to manage under the benchmark of strictness such below the 0.3mm.Why the management standard of impression defective being made as the degree of depth is below the 0.3mm, if be because in said reference, just can come repair-deficiency through cold working such as cold-drawn afterwards, therefore, no problem on quality.
Fig. 1 is the figure of the general operation of expression cylinder body after with the hot tubulation of drawing pipe.Carrying out seamless steel pipe that hot tubulation forms through oblique milling is utilizing straightener to implement through inspections such as ultrasonic examination, eddy current inspections defect inspection to be carried out in inside and outer surface, and carry out pickling processes after removal bending etc. corrects.Afterwards, further comprise the magnetic flaw detection in interior final inspection, and temporarily be stored, afterwards, be used for cold working with the drawing pipe as cylinder body.If under the situation of the outer surface impression defective of confirming exist to surpass benchmark (degree of depth is below the 0.3mm) in the inspection till above-mentioned final inspection etc.; Make it satisfy above-mentioned management standard in order to remove this impression defective; Must implement the outer surface milled processed; So, the manufacturing cost of this pipe and cylinder body increases.
Do not find and propose and provide the document that solves countermeasure etc. as problem suppressing this outer surface impression defective that on the pipe that seamless steel pipe is used, produces.But, in the past since, carry out the orange peel that can suppress roller always and then can suppress the method for the defective that orange peel by roller causes on the outer surface of pipe, producing, the research and development of device.
For example, in patent documentation 1, following method is disclosed; That is, utilizing the mandrel mill mode to make in the process of seamless steel pipe, as hole type roll; Use the roller of Shore hardness materials higher, high chromium class or other appointments to replace the roller of spheroidal graphite cast-iron (ダ Network タ イ Le cast iron) system in the past; And between hole type roll and pipe, scatter lubricating oil, and, to hole type roll scatter cooling water on one side rolling pipe on one side.The wearing and tearing and the orange peel that can suppress thus, hole type roll significantly.Can also suppress to copy to the external defects that produces on the pipe because of the orange peel of roller.
In patent documentation 2; A kind of cooling device is disclosed; It is through supplying with cooling fluid and the cooling holes forming roll to the cooling jet that is provided with the mode of each pass in the face of hole type roll with multiple pass, and it constitutes as follows, and the surface temperature of each pass is measured; Based on this measured value, spray in order to make each pass reach the cooling water inflow of the surface temperature of regulation from each cooling jet.Thus, can on the axis direction of hole type roll, keep consistently the surface temperature of hole type roll, prevent to produce thermal stress, thereby can prevent that the losing of roller, steel and the heat of roller from gluing the early stage orange peel of (Japanese: the baked I is paid I) and roller.
Adopt patent documentation 1 or 2 described technology, can be sticking through supply with wearing and tearing, heat that cooling water suppresses roller to the roller surface, prevent the orange peel of roller, thus the generation of the external defects that can suppress to cause because of the roller orange peel.Supply method from cooling water to roller surface that supply with cooling water, particularly as after be one of effective method that is used to be suppressed at the outer surface impression defective that produces on the pipe that seamless steel pipe uses stating.But the described invention of above-mentioned patent documentation is not to be suppressed at the invention as purpose of the outer surface impression defective that produces on the pipe that seamless steel pipe uses, in order to prevent this outer surface impression defective, need to be different from the new countermeasure of the described technology of the document.
Technical literature formerly
Patent documentation
Patent documentation 1: japanese kokai publication hei 4-22502 communique
Patent documentation 2: japanese kokai publication sho 61-296909 communique
Summary of the invention
The problem that invention will solve
As stated, in the seamless steel pipe (that is, cylinder body is used pipe with seamless steel pipes such as drawing pipes) that hot tubulation forms, tend to find to have produced outer surface impression defective, thereby become the main cause that manufacturing cost is risen.
The present invention promptly makes with the such problem in the pipe in view of seamless steel pipe, and its purpose is to provide a kind of and after carrying out tubulation through oblique milling, is implemented rectification, is used for the inhibition method of the outer surface impression defective of cold worked pipe (seamless steel pipe is used pipe) afterwards by straightener.
The technological means that is used to deal with problems
Main contents of the present invention are following.
(1) a kind of seamless steel pipe is with the inhibition method of the outer surface impression defective of pipe, and this seamless steel pipe is implemented to correct by straightener behind hot tubulation with pipe, is used for cold-drawn afterwards, and this inhibition method is characterised in that,
When utilizing straightener to correct, scatter cooling water to the whole surface of the roller that constitutes straightener, and, be below the 550kN and gently depress pipe through making the load that puts on smoothing roll.
(2) according to the inhibition method of above-mentioned (1) described seamless steel pipe, it is characterized in that the above-mentioned method of gently depressing is to use the method for thermal straightening machine with the outer surface impression defective of pipe.
(3) according to above-mentioned (1) or (2) described seamless steel pipe inhibition method with the outer surface impression defective of pipe; It is characterized in that; Utilize more than one the method in following three kinds of methods to implement to scatter cooling water to the whole surface of above-mentioned roller, these three kinds of methods are: the end shape that makes the cooling water nozzle is the method for wide-angle shape; Make the whole surface that is configured to help of cooling water nozzle scatter the method for the configuration of cooling water to roller; And the method that increases the distribution water yield of cooling water.
The effect of invention
Seamless steel pipe of the present invention is to scatter cooling water and gently depress the method for pipe to the whole surface of roller when behind hot tubulation, utilizing straightener to correct with the inhibition method of the outer surface impression defective of pipe.Adopt the inhibition method of outer surface impression defective of the present invention, can suppress when correcting the outer surface impression defective that produces on pipe at seamless steel pipe effectively by straightener.Thus, the outer surface milled processed expense that is used to remove above-mentioned outer surface impression defective can be cut down significantly, thereby the pipe manufacturing cost can be sought to reduce.
Description of drawings
Fig. 1 is the figure of the general operation of expression cylinder body after with the hot tubulation of drawing pipe.
Fig. 2 is the figure of an example of installment state of structure and roller cooling water pipe that schematically shows the major part of straightener.
Fig. 3 is straightener load and the figure of the relation between the outer surface impression defective generation rate that illustrates when being corrected by straightener.
Fig. 4 is rolling quantity and the figure of the relation between the straightener load that illustrates when being corrected by straightener.
Fig. 5 is the figure that schematically shows the state that disperses of the cooling water that scatters to smoothing roll from the cooling water nozzle, and Fig. 5 (a) is the state that disperses in the example in the past, and Fig. 5 (b) is the state that disperses in the example of the present invention.
Fig. 6 is the figure that the configuration of employed cooling water nozzle when smoothing roll scatters cooling water is described in an embodiment, and Fig. 6 (a) is the nozzle arrangement when utilizing in the past method to correct, and Fig. 6 (b) is the nozzle arrangement when using method of the present invention.
Fig. 7 is the figure that the installment state of the roller cooling water pipe when using method of the present invention in an embodiment is described.
The specific embodiment
The inhibition method of outer surface impression defective of the present invention uses the outer surface impression defective of pipe to be prerequisite to suppress seamless steel pipe; This seamless steel pipe is implemented to correct by straightener behind hot tubulation with pipe, is used for cold-drawn afterwards, and this inhibition method is characterised in that; When utilizing straightener to correct; Cooling water is scattered on whole surface to the roller that constitutes straightener, and, be below the 550kN and gently depress pipe through making the load that puts on smoothing roll.
In the inhibition method of outer surface impression defective of the present invention, why scatter cooling water to the whole surface of the roller that constitutes straightener, be in order to remove attached to the lip-deep oxide skin of roller.In addition, though be expressed as " distribution cooling water " at this, also comprise approach to make cooling water from nozzle etc. effectively ejection " ejection ", make " injection " that cooling water sprays more strong state interior.
For scatter cooling water to roller surface for, just come into effect since in the past, usually, through from carrying out with ejiction opening (cooling water nozzle) the ejection cooling water that has carried out in the mode that proper spacing axially is set of paired each roller up and down installing.
Fig. 2 is the figure of an example of installment state of structure and roller cooling water pipe that schematically shows the major part of straightener.As shown in Figure 2, straightener has 3 to (No.1, No.2 and No.3) relatively roller 1a, the 1b of configuration up and down, roller cooling water pipe 2a be configured in No.1, No.2 and No.3 top roll 1a the top and be fixed on the jacket 3a.In lower roll 1b, roller cooling water pipe 2b likewise be configured in No.1, No.2 and No.3 lower roll 1b the below and be fixed on the jacket 3b.Each roller cooling water pipe 2a, 2b on the part of roll shaft, with proper spacing cooling water nozzle (not shown) is installed.
But; Because scattering cooling water to the roller surface is to be main purpose with the chill roll in the past; Therefore; The end shape of nozzle is linear (straight), the ejection of cooling water (state disperses) linearly, thereby have the residual situation that oxide skin etc. arranged on the position that cooling water does not contact (with reference to after Fig. 5 (a) of stating).
At this, in the inhibition method of outer surface impression defective of the present invention, scatter cooling water through whole surface, and eliminate the position that cooling water does not contact, thereby can remove all attached to the lip-deep oxide skin of roller to roller.If oxide skin not left behind, then when utilizing straightener to correct pipe, oxide skin can be by roller by on the surface that is pressed in pipe, thereby can avoid producing the impression defective.
Do not have any regulation for the distributing method that scatters cooling water to the whole surface of roller, condition etc.So long as cooling water and the contacted method in whole surface, the condition of each roller that constitutes straightener are got final product, can adopt.For the concrete example of the distributing method of preferred cooling water will after state and describe.
In the inhibition method of outer surface impression defective of the present invention; Why make the load that puts on smoothing roll (below; Be called " straightener load ") for 550kN to get off gently to depress pipe, be in order pushing of oxide skin to be suppressed to produce the impression defective through alleviating roller.
Fig. 3 is straightener load and the figure of the relation between the outer surface impression defective generation rate that illustrates when being corrected by straightener.Fig. 3 carries out the seamless steel pipe that hot tubulation forms, external diameter is 200mm, wall thickness is 18.0mm (material: be object the material that is equivalent to SAE 1026 (JI S standard)) to utilize Mannesmann-mandrel mill tubulation method.And Fig. 3 is the figure that investigation result was investigated, straightener load and outer surface impression defective generation rate were represented as diaxon in the variation of outer surface impression defective generation rate that the variation by straightener load is caused.
Said " outer surface impression defective generation rate " with straightener load arbitrarily (for example is meant; Inspection quantity 700kN) is as denominator, with having produced the ratio (representing with percentage) that the degree of depth is tried to achieve as molecule above the pipe quantity of the outer surface impression defective of 0.3mm.In addition, for example " straightener load is 700kN " is meant that straightener load is greater than 650kN and smaller or equal to the load within the scope of 700kN.
Can be clear and definite according to Fig. 3, the also big more tendency of the high more outer surface impression of straightener load generation of defects rate is arranged.In embodiment illustrated, be under the situation below the 550kN in straightener load, do not find that the degree of depth surpasses the outer surface impression defective of 0.3mm.In the inhibition method of outer surface impression defective of the present invention, making the straightener load when gently depressing pipe is just to be based on above-mentioned investigation result below the 550kN.
Straightener load can be according to the object of being implemented by straightener to correct (promptly; The difference of the external diameter pipe that hot tubulation forms), wall thickness, material etc. and having greatly changed, but can straightener load be adjusted to below the 550kN through changing the rolling quantity of when correcting, setting.
Fig. 4 is rolling quantity and the figure of the relation between the straightener load that illustrates when being corrected by straightener.Fig. 4 carries out the seamless steel pipe that hot tubulation forms, external diameter is 232mm (material: be object the material that is equivalent to SAE1026 (JIS standard)) to utilize Mannesmann-mandrel mill tubulation method equally.And Fig. 4 is that the variation when having changed rolling quantity is investigated to straightener load, and rolling quantity and straightener load as diaxon, are represented the wall thickness of object pipe the figure of investigation result as parameter.In Fig. 4, the straightener load of the longitudinal axis is to represent as the mean value of the load that the pipe that is in each wall thickness range shown in this Fig is applied.Wall thickness (the unit: mm) of " Wt " expression pipe shown in addition, in the frame among this figure.
As shown in Figure 4, straightener load has greatly changed according to the difference of wall thickness, and wall thickness is thick more, and straightener load is big more.When increasing rolling quantity, no matter be thicker pipe of wall thickness or the thin pipe of wall thickness, straightener load all can increase, and thus, thereby can know and can adjust straightener load minimizing straightener load through changing rolling quantity.
As stated, the inhibition method of outer surface impression defective of the present invention is when using pipe to utilize straightener implement to correct as object with seamless steel pipe, will push pushing of oxide skin and alleviate the method that effect combines and forms by the removal effect of scattering the scale removal that cooling water play to the whole surface of roller with by gently depressing alleviating of playing.
Can eliminate the reason that produces outer surface impression defective attached to the oxide skin on the roller through removing though only scatter cooling water to the whole surface of roller, but the bending that can't correct pipe.On the other hand, though, still, therefore can't avoid producing the impression defective owing on roller, be attached with oxide skin only through gently depressing the bending that to correct pipe and can alleviating the degree of depth that realizes reducing outer surface impression defective by pushing of oxide skin.That is, through and use to the whole surface of roller and scatter cooling water and under the straightener load of regulation, gently depress, can suppress outer surface impression defective.
In addition; The oxide skin that is generated during hot tubulation is not only on the surface attached to roller; Also on the surface attached to pipe; But when utilizing straightener to correct, also can wander on the surface through the pipe between roller, thereby also can remove lip-deep oxide skin attached to pipe to the cooling water that scatter on the whole surface of up-down rollers.Thereby, also suppressed the impression generation of defects that causes by attached to the lip-deep oxide skin of pipe.
In the inhibition method of outer surface impression defective of the present invention,, preferably adopt the pipe that utilizes thermal straightening machine that hot tubulation is formed to implement the embodiment of correcting (this embodiment note is made " embodiment 1 ") as the above-mentioned method of gently depressing.
Pipe behind the hot tubulation implement to be corrected by straightener after usually near naturally cooling to normal temperature; But in this embodiment 1; Behind hot tubulation, utilize straightener that the pipe that is in 500 ℃～550 ℃ the temperature range is applied rectification (that is, utilizing thermal straightening machine to correct).With compare at normal temperatures, pipe is at high temperature easily deformable, thereby can obtain identical rolling quantity with the straightener load lower than at normal temperatures straightener load.Thereby as the method for gently depressing, the way of utilizing thermal straightening machine to correct is effective.In practical operation, in stove, temporarily pipe is incubated about 570 ℃, afterwards, make this pipe through straightener, thus, can in above-mentioned temperature range, implement to correct to pipe.
Through utilizing this thermal straightening machine to correct, even under the thicker and situation that be difficult to realize gently depressing near the rectification of being undertaken by straightener the normal temperature, also can be implemented in gently depressing under the afore mentioned rules load at for example wall thickness.
In above-mentioned example shown in Figure 4, when desire utilizes straightener to thicker (for example more than the 20mm) of wall thickness when pipe is corrected, if do not set rolling quantity lower, gently depressing below the 550kN that then can't stipulate in the present invention.In this case, if utilize thermal straightening machine to correct, because pipe is easily deformable, the therefore inclination of each curve shown in Figure 4 (using the represented inclination of broken line at the place of point arbitrarily of each curve) all slows down.Its result need not suppress rolling quantity to such an extent that lowly just can be implemented in gently depressing under the afore mentioned rules load, thereby can be stably bending etc. be corrected.
And, correct through utilizing thermal straightening machine, be easy to remove lip-deep oxide skin attached to pipe.That is, because the surface temperature of pipe is higher, therefore, the situation during with normal temperature is compared, oxide skin to the pipe surface paying and insecure, therefore, this oxide skin is easy to be dispersed on the whole surface of roller and wanders the lip-deep cooling water of pipe and remove.
In the inhibition method (comprising above-mentioned embodiment 1) of outer surface impression defective of the present invention interior; Preferably adopt more than one the method utilize in following three kinds of methods to implement to scatter to the whole surface of above-mentioned roller the embodiment (it being recited as " embodiment 2 ") of cooling water, these three kinds of methods are: the end shape that makes the cooling water nozzle is the method (its note is made method 1) of wide-angle shape; Make the whole surface that is configured to help of cooling water nozzle scatter the method (it is recited as method 2) of the configuration of cooling water to roller; And the method (it is recited as method 3) that increases the distribution water yield of cooling water.Below, illustration method 1～method 3.
(1) about method 1 (wide-angleization of the end shape of cooling water nozzle)
Fig. 5 is the figure that schematically shows the state that disperses of the cooling water that scatters to smoothing roll from the cooling water nozzle, and Fig. 5 (a) is the state that disperses in the example in the past, and Fig. 5 (b) is the state that disperses in the example of the present invention.In Fig. 5, only represented in lower roll, likewise to scatter cooling water towards roll surface from its below from the state that disperses of top when roll surface scatters cooling water of the top roll 1a of paired roller.
Fig. 5 (a) is that the end shape of cooling water nozzle is rectilinear situation, in this case, through cooling water pipe 2a by the cooling water that spreads out from nozzle basically not to laterally (roller axially) diffusion, disperse point-blank but be roughly towards roll surface.Therefore, on roller 1a surface, be easy to generate the position that cooling water does not contact, and might be at this position residual oxide skin be arranged.On the other hand, Fig. 5 (b) is that the end shape of nozzle is the situation of wide-angle shape, and in this case, cooling water spreads greatlyyer to laterally (roller axially), thereby cooling water is dispersed on the whole surface of roller 1a.Its result is easy to scale removal on the whole surface of roller 1a, thereby can avoid the impression generation of defects that caused by residual oxide skin.
Be that the angle under the situation of wide-angle shape, shape of nozzle inner surface etc. do not have any regulation for the end shape that makes nozzle.The end shape of this nozzle is so long as make cooling water be easy to the axial diffusion of roller get final product to the shape that scatter on the whole surface of roller, allocation position that also can be through the consideration nozzle, number of configured etc. and suitably set the end shape of this nozzle.
(2) method 2 (helping whole surperficial configuration of scattering the nozzle of cooling water) to roller
Scattering cooling water to the whole surface of roller also can reach through the nozzle that configuration suitably is used for scattering to roller up and down cooling water.In above-mentioned Fig. 5 (b); Roughly equally spaced to have disposed 5 cooling water nozzles; But, for example increase to 8,12 through configurable number with this nozzle, and so that scatter from the mutual mode that overlaps of the cooling water of nozzle adjacent one another are; Thereby can on the roller surface, eliminate the position that cooling water does not contact, can also improve the removal effect of oxide skin.
In addition, for pipe, it is generally acknowledged near the central authorities of roller to receive bigger load; Thereby be easy to generate the impression defective; Therefore, in order to improve near the particularly removal effect of the oxide skin of this part (central authorities), near the way that the central authorities of roller, disposes nozzle is effective morely.From reducing the viewpoint of equipment cost, this nozzle arrangement also is favourable.
(3) method 3 (increasing the distribution water yield of cooling water)
The distribution water yield that increases cooling water can make the whole surface distribution cooling water to roller become easily, and can improve the removal effect of oxide skin through further raising hydraulic pressure, and therefore, the distribution water yield that increases cooling water is special effective method.Being dispersed in the lip-deep a large amount of cooling water of roller and also can on the pipe surface, flowing, therefore, also has been effective attached to the oxide skin on the pipe for removing.
For said method 1～method 3, can distinguish individually and use.Arbitrary method all can play a role effectively, residually helps to suppress outer surface impression defective through what eliminate oxide skin.And, preferably also with any two methods or all methods in said method 1～method 3.Thus, can improve the removal effect of oxide skin through the characteristic of bringing into play each method respectively, and, through also using said method, can also seek to reduce cost.
Adopt this embodiment 2, can remove attached to the oxide skin on the smoothing roll through when correcting pipe, scattering cooling water to the whole surface of roller effectively.Particularly if gently depressing when utilizing thermal straightening machine to correct is very effective for suppressing outer surface impression defective then.
Embodiment
Be that 232mm, wall thickness are the seamless steel pipe (material: be that object is when utilizing straightener to correct the material that is equivalent to SAE1026 (JIS standard)) of 19mm to utilize Mannesmann-mandrel mill tubulation method to carry out that hot tubulation forms, external diameter; Use method of the present invention, the outer surface impression generation of defects situation on the seamless steel pipe (cylinder body is used the drawing pipe) that above-mentioned hot tubulation is formed is investigated.In addition, in order to compare, the situation of also method of utilizing in the past being corrected pipe (example in the past) has been implemented identical investigation.
Employed straightener is the straightener with 3 pairs of rollers (No.1, No.2 and No.3) that on above-below direction, dispose relatively.
Fig. 6 is the figure of explanation configuration of employed cooling water nozzle when smoothing roll scatters cooling water, and Fig. 6 (a) is the nozzle arrangement when utilizing in the past method to correct, and Fig. 6 (b) is the nozzle arrangement when using method of the present invention.The top roll 1a that in Fig. 6, has only represented paired up and down roller in lower roll, also forms the nozzle arrangement identical with top roll respectively.The end shape of employed nozzle is linear when utilizing in the past method to correct, and the end shape of employed nozzle is a wide-angle shape when using method of the present invention.
As shown in Figure 6, roller cooling water pipe 2a is kept by the pipe arrangement supporting member 4 that is fixed on the jacket 3a.Shown in Fig. 6 (a), when utilization method is in the past corrected pipe, spray water through using 5 nozzles 5 that roughly equally spaced dispose, and pair roller 1a cools off.
Relative therewith, shown in Fig. 6 (b), when using method of the present invention, increased by 1 nozzle 5, disposed nozzle 5 be easy to generate the central authorities of impression defective it is generally acknowledged of roller 1a near morely.And, above the top roll 1a nearby side with above the top roll 1a that is equipped with at No.1, No.2 and No.3 of rear side above the roller cooling water pipe 2a of configuration.Below the lower roll configuration the roller cooling water pipe be installed in similarly lower roll below nearby side with below rear side.
Fig. 7 is the key diagram of the installment state of the roller cooling water pipe when using method of the present invention, and the A-A that is above-mentioned Fig. 6 (b) is to view (partial view).The top that roller cooling water pipe 2a shown in this figure is mounted in top roll 1a is the cooling water pipe of side nearby, and, keep by the pipe arrangement supporting member 4 that is fixed on the jacket 3a.Cooling water nozzle 5 is so that the central axis of nozzle has tilted 45 ° state configuration with respect to vertical on cooling water pipe 2a, so that the cooling water that is scattered vertically contacts with the surface of top roll 1a to rear side (roll shaft side).Be installed in top roll 1a above rear side and be installed in lower roll below nearby side with below on the cooling water pipe of rear side, dispose the cooling water nozzle similarly, so that the cooling water that is scattered vertically contacts with the surface of roller.
In table 1, conclude and represented to scatter the distributing method of cooling water, the antidote and the investigation result (the outer surface impression generation of defects rate on the pipe) of pipe to smoothing roll.Outer surface impression generation of defects rate with will check quantity as denominator, will produce the ratio (representing) that the degree of depth tries to achieve as molecule above the pipe quantity of the outer surface impression defective of 0.3mm and represent with percentage.
Table 1
As shown in table 1, under the situation of having used method of the present invention, do not produce the outer surface impression defective (degree of depth＞0.3mm) fully.
Confirm according to above-mentioned investigation result:, can suppress the outer surface impression generation of defects on this pipe effectively through when the seamless steel pipe that utilizes straightener that hot tubulation is formed is corrected with pipe, using method of the present invention.
Utilizability on the industry
The inhibition method of outer surface impression defective of the present invention can be effectively applied to make high-temperature high-pressure boiler with steel pipe, require to have the process cold working such as structural steel pipe of high dimension precision and pipe that the seamless steel pipe made is used.
Description of reference numerals
1a, top roll; 1b, lower roll; 2a, 2b, roller cooling water pipe; 3a, 3b, jacket; 4, pipe arrangement supporting member; 5, cooling water nozzle.
Claims (3)
1. a seamless steel pipe is with the inhibition method of the outer surface impression defective of pipe, and this seamless steel pipe is implemented to correct by straightener behind hot tubulation with pipe, is used for cold-drawn afterwards, and this inhibition method is characterised in that,
When utilizing straightener to correct,
Cooling water is scattered on whole surface to the roller that constitutes straightener, and,
Through making the load that puts on smoothing roll is below the 550kN and gently depress pipe.
2. seamless steel pipe according to claim 1 is characterized in that with the inhibition method of the outer surface impression defective of pipe,
The above-mentioned method of gently depressing is to use the method for thermal straightening machine.
3. seamless steel pipe according to claim 1 and 2 is characterized in that with the inhibition method of the outer surface impression defective of pipe,
Utilize more than one the method in following three kinds of methods to implement to scatter cooling water to the whole surface of above-mentioned roller, these three kinds of methods are: the end shape that makes the cooling water nozzle is the method for wide-angle shape; Make the whole surface that is configured to help of cooling water nozzle scatter the method for the configuration of cooling water to roller; And the method that increases the distribution water yield of cooling water.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010128817A JP2011251334A (en) | 2010-06-04 | 2010-06-04 | Method for suppressing surface indentation flaw in element tube for seamless steel tube |
| JP2010-128817 | 2010-06-04 | ||
| PCT/JP2011/002907 WO2011151995A1 (en) | 2010-06-04 | 2011-05-25 | Method for suppressing surface indentation flaw in element tube for seamless steel tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102821887A true CN102821887A (en) | 2012-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011800155721A Pending CN102821887A (en) | 2010-06-04 | 2011-05-25 | Method for suppressing surface indentation flaw in element tube for seamless steel tube |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2011251334A (en) |
| KR (1) | KR20120125987A (en) |
| CN (1) | CN102821887A (en) |
| WO (1) | WO2011151995A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106623276A (en) * | 2016-12-30 | 2017-05-10 | 宁夏鸿亚特种钢管有限公司 | Method for removing oxidized scales on surface of bearing steel tubular billet after spheroidizing annealing |
| CN114029357A (en) * | 2021-11-05 | 2022-02-11 | 江苏亨通海洋光网***有限公司 | Stretching repair process for submarine cable metal pipe defects |
| CN116689548A (en) * | 2023-06-07 | 2023-09-05 | 上海海隆石油管材研究所 | Straightening method of high-steel-grade sulfur-resistant drill rod |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103894454B (en) * | 2014-04-15 | 2016-01-20 | 燕山大学 | Ultra-fine tube straightener for pipe |
| CN104324974B (en) * | 2014-08-28 | 2016-06-29 | 攀钢集团成都钢钒有限公司 | The finely finishing method of titanium alloy seamless pipe |
| JP7131536B2 (en) * | 2019-12-13 | 2022-09-06 | Ｊｆｅスチール株式会社 | Method for manufacturing seamless steel pipe |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01245914A (en) * | 1988-03-28 | 1989-10-02 | Sumitomo Metal Ind Ltd | Manufacture of metallic pipe excellent in out-of-roundness of outer diameter |
| JPH07178456A (en) * | 1993-12-24 | 1995-07-18 | Kobe Steel Ltd | Method for straightening steel plate by roller leveller |
| JPH1190511A (en) * | 1997-09-26 | 1999-04-06 | Sumitomo Metal Ind Ltd | Method and equipment for manufacturing seamless steel tube excellent in surface property |
| JP2001179340A (en) * | 1999-12-24 | 2001-07-03 | Sumitomo Metal Ind Ltd | Method for correcting tube by tube corrector with roller system |
| CN101376136A (en) * | 2007-08-27 | 2009-03-04 | 江苏宏宝集团有限公司 | Method for producing martensitic stainless steel seamless steel pipe |
| JP2009202192A (en) * | 2008-02-27 | 2009-09-10 | Jfe Steel Corp | Hot leveler and double pipe |
-
2010
- 2010-06-04 JP JP2010128817A patent/JP2011251334A/en active Pending
-
2011
- 2011-05-25 CN CN2011800155721A patent/CN102821887A/en active Pending
- 2011-05-25 KR KR1020127024935A patent/KR20120125987A/en not_active Application Discontinuation
- 2011-05-25 WO PCT/JP2011/002907 patent/WO2011151995A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01245914A (en) * | 1988-03-28 | 1989-10-02 | Sumitomo Metal Ind Ltd | Manufacture of metallic pipe excellent in out-of-roundness of outer diameter |
| JPH07178456A (en) * | 1993-12-24 | 1995-07-18 | Kobe Steel Ltd | Method for straightening steel plate by roller leveller |
| JPH1190511A (en) * | 1997-09-26 | 1999-04-06 | Sumitomo Metal Ind Ltd | Method and equipment for manufacturing seamless steel tube excellent in surface property |
| JP2001179340A (en) * | 1999-12-24 | 2001-07-03 | Sumitomo Metal Ind Ltd | Method for correcting tube by tube corrector with roller system |
| CN101376136A (en) * | 2007-08-27 | 2009-03-04 | 江苏宏宝集团有限公司 | Method for producing martensitic stainless steel seamless steel pipe |
| JP2009202192A (en) * | 2008-02-27 | 2009-09-10 | Jfe Steel Corp | Hot leveler and double pipe |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106623276A (en) * | 2016-12-30 | 2017-05-10 | 宁夏鸿亚特种钢管有限公司 | Method for removing oxidized scales on surface of bearing steel tubular billet after spheroidizing annealing |
| CN114029357A (en) * | 2021-11-05 | 2022-02-11 | 江苏亨通海洋光网***有限公司 | Stretching repair process for submarine cable metal pipe defects |
| CN114029357B (en) * | 2021-11-05 | 2023-12-12 | 江苏亨通海洋光网***有限公司 | Stretching repair process for submarine cable metal tube defects |
| CN116689548A (en) * | 2023-06-07 | 2023-09-05 | 上海海隆石油管材研究所 | Straightening method of high-steel-grade sulfur-resistant drill rod |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011251334A (en) | 2011-12-15 |
| WO2011151995A1 (en) | 2011-12-08 |
| KR20120125987A (en) | 2012-11-19 |
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Application publication date: 20121212 |