CN101376134A - Method for producing martensitic stainless steel seamless steel pipe - Google Patents
Method for producing martensitic stainless steel seamless steel pipe Download PDFInfo
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- CN101376134A CN101376134A CNA200710147955XA CN200710147955A CN101376134A CN 101376134 A CN101376134 A CN 101376134A CN A200710147955X A CNA200710147955X A CN A200710147955XA CN 200710147955 A CN200710147955 A CN 200710147955A CN 101376134 A CN101376134 A CN 101376134A
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- martensitic stainless
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Abstract
The invention relates to a method for producing a martensitic stainless steel seamless steel pipe, which comprises the steps of heating, piercing, rolling, acid cleaning and straightening a pipe blank, wherein 20-30 percent of sulfuric acid liquid is used as an acid cleaning solution in the step of acid cleaning. The invention adopting the sulfuric acid liquid as the acid cleaning solution, and 0.5-5 percent of NaCl and 1-10 percent of NaNO3 are added to the acid cleaning solution of sulfuric acid as slow-release agents; and meanwhile, the acid cleaning solution is firstly heated up to 50-80 DEG C in the step of acid cleaning. Therefore, the method and the process can not only clean oxide scale, but also enable the surface to be smooth without excessive acid cleaning. In addition, the invention further adopts a continuous and equal-diameter hot piercing process, and adopts a cold rolling process in the rolling process, thereby effectively preventing pipe materials from being unevenly deformed; and the produced steel pipe has the advantages of small tolerance between the outer diameter and the wall thickness, high accuracy, and better quality and more smooth surface.
Description
Technical field:
The present invention relates to a kind of production method of seamless steel pipe, more particularly, relate to a kind of production method of martensitic stainless steel seamless steel pipe.
Background technology:
Martensitic stainless steel such as 1Cr13 and 1Cr12Mo, have preferably advantages such as decay resistance, high toughness and cold deformation performance be good, and its vibration damping is good, be widely used in the dynamic and static blade of steam turbine, compressor guide vane and other corrosion-resistant parts, as generator water tank, water tank ring, central tube, water swivel flange etc., also can be applicable to key areas such as nuclear industry,, can use below 450 ℃ according to its heat resistance.But, because the yield tensile ratio of this class material is higher, cause it to be difficult to processing, in the production method of existing martensitic stainless steel seamless steel pipe, in perforation and technology such as rolling, take hot piercing in conjunction with hot rolling or continuous casting and rolling more, for example disclosed Chinese patent CN96116963.X, CN90109547.8, CN200510059854.8, the CN200610038586.6 disclosed method, and these methods focus on the adjustment or the quenching of trace element in the material---in the improvement of technologies such as tempering, but still all there is defective in these existing manufacturing technique: the external diameter and the wall thickness tolerance of processing back steel pipe are bigger, surface quality is relatively poor, is usually expressed as rough surface, injustice has crackle etc. concurrently.
Especially the acid pickling step of prior art all adopts acetum or hydrochloric acid solution as pickle, and the temperature of pickle is controlled at below 60 ℃, but because the corrosivity of the pickle of acetic acid or hydrochloric acid is not enough, and the intractable that produces oxide skin in martensitic stainless steel such as 1Cr13 and the 1Cr12Mo process is strong, thereby there is the situation that oxide skin etc. is not washed clean all the time, causes tube surfaces of poor quality.
Summary of the invention:
Technical problem to be solved by this invention is, overcome the defective of above-mentioned prior art and a kind of precision height is provided, the production method of martensitic stainless steel seamless steel pipe that the steel tube surface quality that makes is good.
For achieving the above object, the present invention takes following design:
The production method of martensitic stainless steel seamless steel pipe of the present invention comprises the heating of pipe, and perforation, rolling, pickling and aligning step, in described acid pickling step, uses 20～30% sulfuric acid solutions as pickle.
According to the production method of martensitic stainless steel seamless steel pipe provided by the invention, also have following attached technical characterictic:
In described pickle, also be incorporated as 0.5～5% sodium chloride (NaCl) and 1～10% sodium nitrate (NaNO
3) as sustained release agent.
In institute's acid pickling step, described pickle is heated to 50～80 ℃.
The production technology of described perforation step is continuous, isometrical hot piercing.
Described perforation step is made hollow forging for the described pipe after the heating is carried out continuous, isometrical hot piercing process.
The top of using in described hot piercing process is not for there being the top of wearing and tearing.
After described perforation step is finished, enter described rolling step immediately, described rolling step is for to carry out the cold rolling pipe fitting of being processed into to described hollow forging.
In described cold rolling processing, the deflection of described hollow forging is single pass 1.4～1.6mm.
In described cold rolling processing, the wall thickness reducing amount of described hollow forging: sizing reduction is greater than 1:3.
In the described aligning step, before aligning, earlier described pipe fitting is heated to 100～200 ℃.
In the described aligning step, before described pipe fitting enters straightener, described pipe fitting is heated by induction heating circle.
Advantage of the present invention is:
At first, because the present invention adopts sulfuric acid solution as pickle, and in sulfuric acid pickling solution, also add 0.5～5% NaCl and 1～10% NaNO
3As sustained release agent, simultaneously, in acid pickling step, earlier pickle is heated to 50～80 ℃, this kind method technology can either be cleaned the oxide skin on pipe fitting surface, can be so that smooth surface can be controlled pipe fitting again not by overpickling.
Secondly, in addition, the present invention has also taked continuous, isometrical hot piercing process, and adopt the cold-rolling process of large deformation in the operation of rolling, so, can prevent effectively that tubing from producing inhomogeneous deformation, and the outer diameter of steel pipes of producing and wall thickness tolerance are little, the precision height, surface quality is better, Paint Gloss.
In addition, the present invention has also adopted temperature correction technology in the aligning step, before pipe enters straightener, by induction heating circle pipe is heated to 100～200 ℃, making seamless steel pipe be difficult for rectifying splits, and the steel pipe of producing is directly spent well, and flexibility has improved product percent of pass greatly less than 1.5mm/m.
Specific embodiments:
The production method of a kind of martensitic stainless steel seamless steel pipe of the present invention, comprise steps such as heating of pipe blank, perforation, rolling, pickling and aligning, in the middle of existing technology, acid pickling step all adopts acetum or hydrochloric acid solution as pickle, and the temperature of pickle is controlled at below 60 ℃, thereby there is the situation that oxide skin etc. is not washed clean all the time, causes tube surfaces of poor quality.The pickle of acid pickling step of the present invention adopts and adds 0.5～5% NaCl and 1～10%NaNO
3As 20～30% sulfuric acid solutions of sustained release agent, and pickle is heated to 60～80 ℃ situation carries out pickling.The applicant has broken through those of ordinary skill and has thought that sulfuric acid corrosion resistance is too strong and can not more can not be as the common understanding of pickle as the sulfuric acid solution of pickle, especially heating, by a large amount of tests, under the situation that adds sustained release agent, successfully adopt the sulfuric acid solution of heating as pickle, played good technical effect, both can clean defectives such as oxide skin well, can guarantee again that pipe fitting was not by overpickling.
In addition, in the hot piercing step, this patent has adopted the isometrical perforation that is different from the prior art extension diameter perforation, and when perforation used top for there not being the top of wearing and tearing, cause the thin defective of steel pipe tube wall thereby overcome existing extension diameter perforation.
In rolling step, the present invention adopts the cold rolling of large deformation, be different from the hot rolling or the continuous casting and rolling of prior art, and it is very compact to rolling step rhythm in hot piercing, be to enter rolling step after the hot piercing immediately, thereby make the product external diameter produce and wall thickness tolerance is little, surface quality is good, overcome the defective of prior art.The cold rolling step of described large deformation, the deflection that is exactly single pass is 1.4～1.6mm, the wall thickness reducing amount that guarantees simultaneously hollow forging in the operation of rolling and the ratio of sizing reduction are greater than 1:3.Therefore because of the yield tensile ratio of martensitic stainless steels such as 1Cr13 and 1Cr12Mo is bigger, before this patent, those of ordinary skill in the art thinks that all deflection is less relatively good in the operation of rolling, and can not carry out cold rolling.But the applicant is by test of many times, but find not only can carry out to this class material cold rolling, and adopt the single pass large deformation rolling can also effectively overcome in the past defectives such as crackle, distortion be inhomogeneous appear in the operation of rolling easily.Processing method before this patent, in rolling step single pass heavy deformation all less than 1.3mm, and the application's applicant finds that by test single pass can adopt the deflection of 1.4～1.6mm fully, so not only can realize cold rolling, and can effectively prevent inhomogeneous deformation, and rolling back tube surfaces quality is fine.For pipe quality in the better assurance operation of rolling, the ratio that also requires wall thickness reducing amount and sizing reduction is greater than 1:3, if the ratio of the wall thickness reducing amount of steel pipe and sizing reduction is less than 1:3, be that wall thickness reducing amount is too small and words that sizing reduction is excessive, crackle appears in then rolling easily, sizing reduction is too small if opposite wall thickness reducing amount is excessive, then is difficult to realize smoothly cold rolling step.
The present invention for pickling after the aligning of tubing, be not the normal temperature aligning that adopts usually, but adopt load coil that seamless steel pipe is added to the aligning that carries out again after 100～200 ℃, promptly be referred to as described temperature correction.Because martensitic stain less steel has characteristics such as the strong coefficient height of bending, notch sensitivity height, then align at normal temperatures to be difficult to align the level of needs or to be rectified and split.The application is straight by the band temperature correction that a large amount of tests draw the application, not only can realize aligning easily, obtains standard-required, but also does not ftracture.But the temperature of heating is difficult for too high again, if too high, sticking easily smoothing roll causes the pipe fitting surface quality poor all the better.
Applicant of the present invention has carried out repeatedly many group tests, and has obtained following data, has fully verified beneficial effect of the present invention.
Embodiment 1:
The production method of martensitic stainless steel seamless steel pipe of the present invention, comprise the heating of pipe, and perforation, rolling, pickling and aligning step, in described acid pickling step, use 20～30% sulfuric acid solutions as pickle, and, in described pickle, also add 0.5～5% NaCl and 1～10% NaNO
3As sustained release agent, in addition, in institute's acid pickling step described pickle is heated to 50～80 ℃ temperature.Can clean scale surface like this, and smooth surface, not overpickling.
Applicant of the present invention has carried out repeatedly many group tests, and has obtained following data to confirm beneficial effect of the present invention.
The pickling record of L8013Cr
| Time | Steel pipe sizes mm | Solution composition | Temperature ℃ | Time | Effect |
| On May 17th, 2007 | 73×5.5 | H 2SO 4：16～18％ NaCl：1～2％ NaNO 3：5％ | 70～85 | 3 hours | Surfaces externally and internally oxide skin can wash clean, but overpickling is uneven |
| On May 18th, 2007 | 73×5.5 | H 2SO 4：16～18％ NaCl：1～2％ NaNO 3：2.5％ | 70～80 | 1 hour | Surfaces externally and internally oxide skin substantially can wash clean |
Embodiment 2:
The main distinction of present embodiment and the foregoing description is perforation and the rolling step in the seamless steel tube production process, described perforation step is continuous, isometrical hot piercing process, and the top in described hot piercing process is not for there being the top of wearing and tearing, utilize isometrical piercing process also to make the tube wall of steel pipe once thick, in addition, described rolling step is cold rolling, Continuous Heat piercing process of the present invention is meant and enters cold rolling step immediately after hot piercing, and described cold rolling step adopts aximal deformation value, single pass is 1.4～1.6mm, and require the wall thickness reducing amount of steel pipe simultaneously: sizing reduction is greater than 1:3.。
The inventor adopts the hollow forging of 90 * 7.5mm, is rolled into the seamless steel pipe of 73 * 6mm, and sample size is 5, and concrete data see following table for details: unit: mm
| Sequence number | Roll preceding size | Mill product | Outside dimension (4 points) | Wall thickness tolerance (4 points) |
| 1 | 90×7.5 | 73×6 | 73.32，73.1，72.7，72.9 | 6.25，6.35，6.28，6.05 |
| 2 | 90×7.5 | 73×6 | 73.28，73.14，72.7，72.85 | 6.4，6.31，6.11，5.68 |
| 3 | 90×7.5 | 73×6 | 73.35，73.2，73.01，72.9 | 6.3，6.02，5.92，5.73 |
| 4 | 90×7.5 | 73×6 | 73.2，73.03，73.8，73.9 | 6.27，5.98，5.97，5.66 |
| 5 | 90×7.5 | 73×6 | 73.25，73.1，72.9，72.62 | 6.20，5.99，5.67，5.58 |
Embodiment 3:
The main distinction of present embodiment and the foregoing description is the aligning step in the seamless steel tube production process, wherein in described aligning step, before aligning, earlier with heating of pipe blank to 100～200 ℃.More specifically, before pipe enters straightener, by induction heating circle pipe is heated to 100～200 ℃ and aligns again afterwards.This kind technology makes steel pipe be difficult for strong splitting, and the straight degree of steel pipe behind aligning is better, and flexibility is less than 1.5mm/m.
The applicant adopts the tubing of 50 2Cr13,73 * 6mm to divide 5 groups to align, and obtains the result of following table:
| Specification (mm) | Radical | Heating-up temperature | Flexibility (mm/m) | Surface quality |
| 73 * 6 | 10 | Normal temperature, do not heat | 2.5,2.8,3.0,3.1,3.05 | Two strong splitting are arranged |
| 73 * 6 | 10 | 100 ℃ | 1.05,1.1,0.9,1.3,1.5 | Still can in the surface |
| 73 * 6 | 10 | 150 ℃ | 1.4,1.2,1.0,0.9,0.95 | The surface better |
| 73 * 6 | 10 | 200 ℃ | 1.3,1.0,1.1,0.8,1.1 | Still can in the surface |
| 73 * 6 | 10 | 250 ℃ | 1.2,1.0,0.9,0.8,1.1 | Sticking smoothing roll, there are some pits on the surface. |
Obviously, those of ordinary skill in the art can be applied to the production process of various types of heavy alloy pipes with the production method of martensitic stainless steel seamless steel pipe of the present invention.
The foregoing description is only for the usefulness that the present invention is described; and be not to be limitation of the present invention; the those of ordinary skill in relevant technologies field; under the situation that does not break away from the spirit and scope of the present invention; can also make various variations and distortion; therefore all technical schemes that are equal to also should belong to category of the present invention, and scope of patent protection of the present invention should be limited by each claim.
Claims (10)
1, the production method of martensitic stainless steel seamless steel pipe comprises the heating of pipe, and perforation, rolling, pickling and aligning step, it is characterized in that: in described acid pickling step, use 20～30% sulfuric acid solution as pickle.
2, the production method of martensitic stainless steel seamless steel pipe according to claim 1 is characterized in that: also add 0.5～5% sodium chloride (NaCl) and 1～10% sodium nitrate (NaNO in described pickle
3) as sustained release agent.
3, the production method of martensitic stainless steel seamless steel pipe according to claim 2 is characterized in that: in institute's acid pickling step, described pickle is heated to 50～80 ℃.
4, the production method of martensitic stainless steel seamless steel pipe according to claim 1 is characterized in that: described perforation step is made hollow forging for the described pipe after the heating is carried out continuous, isometrical hot piercing process.
5, the production method of martensitic stainless steel seamless steel pipe according to claim 4 is characterized in that: the top of using in described hot piercing process is not for there being the top of wearing and tearing.
6, the production method of martensitic stainless steel seamless steel pipe according to claim 1 is characterized in that: after described perforation step, enter rolling step immediately, described rolling step is for to carry out the cold rolling pipe fitting of being processed into to described hollow forging.
7, the production method of martensitic stainless steel seamless steel pipe according to claim 6 is characterized in that: in described cold rolling processing, the deflection of described hollow forging is single pass 1.4～1.6mm.
8, the production method of martensitic stainless steel seamless steel pipe according to claim 7 is characterized in that: in described cold rolling processing, the wall thickness reducing amount of described hollow forging: sizing reduction is greater than 1:3.
9, the production method of martensitic stainless steel seamless steel pipe according to claim 1 is characterized in that: in the described aligning step, before aligning, earlier described pipe fitting is heated to 100～200 ℃.
10, the production method of improved stainless-steel seamless pipe according to claim 9 is characterized in that: in the described aligning step, shown in before pipe fitting enters straightener, by induction heating circle described pipe fitting is heated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710147955XA CN101376134B (en) | 2007-08-27 | 2007-08-27 | Method for producing martensitic stainless steel seamless steel pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710147955XA CN101376134B (en) | 2007-08-27 | 2007-08-27 | Method for producing martensitic stainless steel seamless steel pipe |
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|---|---|
| CN101376134A true CN101376134A (en) | 2009-03-04 |
| CN101376134B CN101376134B (en) | 2010-09-29 |
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| CN200710147955XA Expired - Fee Related CN101376134B (en) | 2007-08-27 | 2007-08-27 | Method for producing martensitic stainless steel seamless steel pipe |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101829703A (en) * | 2010-05-17 | 2010-09-15 | 彭敦林 | Martensitic gapless stainless steel tube and manufacturing method thereof |
| CN102010961A (en) * | 2010-09-27 | 2011-04-13 | 苏州奕欣特钢管业有限公司 | Process for producing steel tubes |
| CN102489944A (en) * | 2011-11-29 | 2012-06-13 | 常熟市无缝钢管有限公司 | Processing method of 2Cr13 rectangular pipe |
| CN103789522A (en) * | 2014-01-26 | 2014-05-14 | 重庆无缝管件厂 | Novel process for coldly rolling small-diameter stainless steel pipe |
| CN105033584A (en) * | 2015-07-31 | 2015-11-11 | 湖州高林不锈钢管制造有限公司 | Method for manufacturing heat-resisting stainless steel seamless steel tube |
| CN109047529A (en) * | 2018-08-31 | 2018-12-21 | 江苏宏宝优特管业制造有限公司 | A kind of stable steel pipe punch apparatus |
| CN109513766A (en) * | 2018-11-15 | 2019-03-26 | 南通金尼新材料科技有限公司 | A kind of manufacturing method of high concentricity martensitic stainless steel seamless pipe material |
| CN112792123A (en) * | 2020-12-04 | 2021-05-14 | 天津钢铁集团有限公司 | Production process of sulfuric acid dew point corrosion resistant hot rolled round steel 09CrCuSb |
-
2007
- 2007-08-27 CN CN200710147955XA patent/CN101376134B/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101829703A (en) * | 2010-05-17 | 2010-09-15 | 彭敦林 | Martensitic gapless stainless steel tube and manufacturing method thereof |
| CN102010961A (en) * | 2010-09-27 | 2011-04-13 | 苏州奕欣特钢管业有限公司 | Process for producing steel tubes |
| CN102010961B (en) * | 2010-09-27 | 2013-09-04 | 苏州奕欣特钢管业有限公司 | Process for producing steel tubes |
| CN102489944A (en) * | 2011-11-29 | 2012-06-13 | 常熟市无缝钢管有限公司 | Processing method of 2Cr13 rectangular pipe |
| CN103789522A (en) * | 2014-01-26 | 2014-05-14 | 重庆无缝管件厂 | Novel process for coldly rolling small-diameter stainless steel pipe |
| CN105033584A (en) * | 2015-07-31 | 2015-11-11 | 湖州高林不锈钢管制造有限公司 | Method for manufacturing heat-resisting stainless steel seamless steel tube |
| CN109047529A (en) * | 2018-08-31 | 2018-12-21 | 江苏宏宝优特管业制造有限公司 | A kind of stable steel pipe punch apparatus |
| CN109513766A (en) * | 2018-11-15 | 2019-03-26 | 南通金尼新材料科技有限公司 | A kind of manufacturing method of high concentricity martensitic stainless steel seamless pipe material |
| CN112792123A (en) * | 2020-12-04 | 2021-05-14 | 天津钢铁集团有限公司 | Production process of sulfuric acid dew point corrosion resistant hot rolled round steel 09CrCuSb |
| CN112792123B (en) * | 2020-12-04 | 2022-08-16 | 天津钢铁集团有限公司 | Production process of sulfuric acid dew point corrosion resistant hot rolled round steel 09CrCuSb |
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| CN101376134B (en) | 2010-09-29 |
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