CN1721753A - Manufacturing method of ferritic stainless steel seamless pipe with small diameter - Google Patents
Manufacturing method of ferritic stainless steel seamless pipe with small diameter Download PDFInfo
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- CN1721753A CN1721753A CN 200410019977 CN200410019977A CN1721753A CN 1721753 A CN1721753 A CN 1721753A CN 200410019977 CN200410019977 CN 200410019977 CN 200410019977 A CN200410019977 A CN 200410019977A CN 1721753 A CN1721753 A CN 1721753A
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Abstract
This invention relates to a process method to make stainless steel tube without gap, which comprises the following steps: providing the required steel ingot; forging; heating tube blank; drilling and rolling; processing the rolling, empty sinking, cold-drawing; again empty sinking, final product annealing and final product making.
Description
Technical field
The invention belongs to the metal manufacture field, relate in particular to the manufacturing of ferrite stainless steel pipe, be specially adapted to the manufacturing of minor diameter Ferritic Stainless Steel weldless tube.
Background technique
Ferritic Stainless Steel means that chromium content at 11%-30%, has body-centered cubic crystal structure, under user mode based on the stainless steel of ferritic structure.Ferritic Stainless Steel is except that having rustless property and anti-general corrosion performance, local etchings such as the importantly anti-spot corrosion of its burn into of anti-chloride stress cracking the, slit and corrosion resistant are more good, the intensity height of its Ferritic Stainless Steel, thermal expansion coefficient is low, the laudatory title that the joint nickel and stainless steel is arranged again, though its advantage the more but purposes is wideless, reason is, Ferritic Stainless Steel plasticity is poor, the cold working difficulty, particularly the high chromium-stainless steel difficult forming easily cracks in the course of working, and up-to-standard rate is quite low, strengthen cost, restricted the industry application.
Industry has a lot of achievements in the stainless-steel seamless pipe manufacturing, disclose a kind of manufacturing equipment of making the method for seamless steel pipe and being used to implement this manufacture method as Chinese patent 95195732.5, this method can have good producibility and the seamless steel pipe that is better than the performance of existing product with low manufacture cost manufacturing by manufacturing process and the manufacturing equipment of simplifying.This method by comprise continuous successively 1. following～8. operation constitutes, the operation that is fabricated onto product from steel billet is connected by a continuous circuit with manufacturing equipment.1. be the operation of the steel billet of circle by continuous casting manufactured transverse shape; Steel billet is cooled to Ar#-[1] operation of the following temperature of transformation temperature; Steel billet is heated to the operation of the temperature that can bore a hole; 4. carry out the operation of drilling/rolling, manufacturing hollow bloom with the rate of straining below 200/ second; 5. by continuous elongating mill and finishing mill directly with being connected the milling train of configuration, with predetermined mean strain speed, degree of finish and finishing temperature thereby hollow bloom is extended the operation that steel pipe is made in rolling and finish rolling; 6. at Ar#-[3] temperature more than the transformation temperature carries out the operation of crystallization treatment again to steel pipe; From Ar#-[3] temperature more than the transformation temperature operation that steel pipe is quenched; Steel pipe is carried out the operation of temper.
Known techniques does not still have good plan for the ferritic stainless seamless steel tube manufacturing, especially to the manufacturing of high chromium content ferrite stainless steel minor diameter seamless steel tube, can't solve steel pipe inner and outer surface crackle, the problem that the deep processing productivity is quite low.
Summary of the invention
Problem to be solved by this invention is to overcome the above-mentioned defective that aforementioned techniques exists, and a kind of manufacture method of minor diameter Ferritic Stainless Steel weldless tube is provided.
Primary and foremost purpose of the present invention is to provide a kind of technological method that is suitable for processing high chromium content ferrite minor diameter stainless-steel seamless pipe.
The present invention solves its technical problem and takes following technological scheme to realize, according to a kind of minor diameter Ferritic Stainless Steel weldless tube manufacture method provided by the invention, wherein, comprises following operation:
1. smelt grain size evenly, the steel ingot that scabs of flawless, nothing, and meet:
The Chemical composition of steel ingot: carbon C≤0.12%; Silicon Si＜1.0%; Manganese Mn≤0.8%; Sulphur S≤0.03%; Phosphorus P＜0.0035%; Chromium Cr24-27%; Titanium Ti5c-0.8%, all the other are Fe, 5c is 5 times a Kohlenstoffgehalt;
The Chemical composition of steel ingot satisfies: chromium Cr content is controlled at the 24-25% scope,
The gas content of steel ingot is a nitrogen N
2, hydrogen H
2, oxygen O
2All at 30ppm;
The sonims permitted value of steel ingot: do not allow silicate or oxide to become band or netted;
The macrostructure of steel ingot, the degree of depth of shrinkage cavity and center porosity is no more than the 4-5% of steel ingot height;
II. the operation of Duan Zaoing, compression ratio is 8-12; The initial forging temperature that forges processing is 1050 ℃-1120 ℃, 800 ℃-850 ℃ of final forging temperatures;
III. the bore a hole operation of hot rolling,
(1). will forge rod and be processed as pipe;
(2). the operation of heating of pipe blank,
A. evenly heat pipe with stove, heated 2 hours, to 600 ℃;
B. when rising to 900 ℃, furnace temperature is incubated holding time 20-30 minute;
C. continue heating, make furnace temperature rise to 1050 ℃-1100 ℃;
(3) operation of perforation hot rolling,
A. to III. (2). the pipe perforation after the preface heating,
B. to the pipe continuously hot rolling of (3) .a preface perforation, 850 ℃ of finishing temperatures, amount of deformation is controlled at 45%;
IV. cold worked operation
To the tubing of preface III. (3) preface hot-roll forming carry out cold rolling, empty sinking successively, cold-drawn subtracts wall, empty sinking again, finished products, makes the Ferritic Stainless Steel weldless tube;
The present invention solves its technical problem and can also take following technological scheme further to realize:
Aforesaid minor diameter Ferritic Stainless Steel weldless tube manufacture method, wherein, described smelting procedure is to use vacuum induction furnace smelting, its degree of vacuum is the 10-3 torr.
Aforementioned minor diameter Ferritic Stainless Steel weldless tube manufacture method, wherein, chromium content is controlled at 24-25%.
Aforementioned minor diameter Ferritic Stainless Steel weldless tube manufacture method, wherein, the concrete operation of cold working is:
First preface is rolling, and through aligning, reconditioning, cut off, go up mill milling after the pickling, amount of deformation is controlled at 40.5%;
Second preface is rolling, and the first preface milling material is annealed, and goes up the mill milling amount of deformation after aligning, the pickling and is controlled at 45%;
The 3rd preface is rolling, the second preface milling material annealed, and mill milling after the aligning pickling, amount of deformation is controlled at 45%;
The 4th preface empty sinking is annealed to the 3rd preface milling material, empty sinking again, and amount of deformation is controlled at 14.5%;
The 5th preface cold-drawn subtracts wall, and the 4th preface empty sinking pipe is annealed, and aligns, cuts off, subtracts wall again, and amount of deformation is controlled at 29.5%;
The 6th preface cold-drawn subtracts wall, and the 5th preface empty sinking pipe is annealed, and aligns, cuts off, subtracts wall again, and amount of deformation is controlled at 21.5%;
The 7th preface empty sinking subtracts the wall pipe to the cold-drawn of the 6th preface and anneals, empty sinking again, and amount of deformation is controlled at 13.5%;
The 8th preface empty sinking is annealed to the empty sinking pipe of the 7th preface, empty sinking again, and amount of deformation is controlled at 18.5%;
The 9th preface empty sinking is annealed to the empty sinking pipe of the 8th preface, empty sinking again, and amount of deformation is controlled at 24.5%,
The tenth preface is rolling, and the empty sinking pipe of the 9th preface is annealed, and aligning, pickling roll out finished product again, and amount of deformation is controlled at 47.5%;
The 11 preface finished products carries out vacuum annealing to the production tube of the tenth preface.
Aforementioned minor diameter Ferritic Stainless Steel weldless tube manufacture method, wherein, described cold working operation:
Second preface is rolling, 500 ℃ of the charging temperatures of described annealing, and when furnace temperature rose to 850 ℃, holding time was at 50 minutes, the water-cooled of coming out of the stove;
The 3rd preface is rolling, 500 ℃ of the charging temperatures of described annealing, and when furnace temperature rose to 850 ℃, holding time was at 40 minutes, the water-cooled of coming out of the stove;
The 4th preface is rolling, 500 ℃ of the charging temperatures of described annealing, and when furnace temperature rose to 850 ℃, holding time was at 30 minutes, the water-cooled of coming out of the stove;
The 5th preface cold-drawn subtracts wall, 500 ℃ of the charging temperatures of described annealing, and when furnace temperature rose to 850 ℃, holding time was at 25 minutes, the water-cooled of coming out of the stove;
The 6th preface cold-drawn subtracts wall, 500 ℃ of the charging temperatures of described annealing, and when furnace temperature rose to 850 ℃, holding time was at 23 minutes, the water-cooled of coming out of the stove;
The 7th preface cold-drawn subtracts wall, 500 ℃ of the charging temperatures of described annealing, and when furnace temperature rose to 850 ℃, holding time was at 20 minutes, the water-cooled of coming out of the stove;
The 8th preface empty sinking, 500 ℃ of the charging temperatures of described annealing, when furnace temperature rose to 850 ℃, holding time was at 15 minutes, the water-cooled of coming out of the stove;
The 9th preface empty sinking, 500 ℃ of the charging temperatures of described annealing, when furnace temperature rose to 850 ℃, holding time was at 13 minutes, the water-cooled of coming out of the stove;
The tenth preface is rolling, 500 ℃ of the charging temperatures of described annealing, and when furnace temperature rose to 850 ℃, holding time was at 10 minutes, the water-cooled of coming out of the stove;
The 11 preface finished products, 500 ℃ of the charging temperatures of described vacuum annealing when furnace temperature rises to 880 ℃, are incubated 30 minutes, the air cooling of coming out of the stove.
The present invention compared with prior art has significant advantage and beneficial effect:
By above technological scheme as can be known, the present invention has following advantage at least under the structural arrangements of excellence:
Process configuration of the present invention effectively solved the fragility problem of Ferritic Stainless Steel, reduces even avoided the precipitation of carbon, nitrogen compound to separate out, and improves the high-temperature brittleness problem greatly, effectively prevents sensitization, avoids the appearance of intergranular corrosion problem; Adopt the mode of cold-drawn and cold-rolling process combination further to solve the problem that the Ferritic Stainless Steel weldless tube easily goes out crackle of producing.The present invention can improve production Ferritic Stainless Steel weldless tube yield rate greatly, reduces production costs, and has significant technological progress and important economic implications with comparing of prior art, is easy to the industry promotion and application.
Description of drawings
Heat treated holding time curve diagrammatic sketch among Fig. 1 the present invention;
Fig. 2 process flow diagram of the present invention;
Fig. 3 ferrite shaped steel and austenite shaped steel vary with temperature the comparison diagram of grain size alligatoring;
Fig. 4 finished product metallographic microscope of the present invention.
The specific embodiment of the present invention is provided in detail by following most preferred embodiment:
Embodiment
Below in conjunction with preferred embodiment, to according to embodiment provided by the invention, feature and effect thereof, describe in detail as after; For simple and purpose clearly, hereinafter appropriate omission the description of known technology, in order to avoid those unnecessary details influences are to the description of the technical program.
Make a kind of AISI446 Ferritic Stainless Steel weldless tube, specification is Φ 6.3 * 0.3mm, and external diameter is 0.3-0.35mm, length 58.5 ± 0.1mm for ± 0.1mm, wall thickness; Do not allow crackle during performance requirement: HV＜200 deep processings, and the processing back is extended consistent.
A kind of minor diameter Ferritic Stainless Steel weldless tube manufacture method wherein, comprises following operation:
I. the operation of Ye Lianing adopts the vacuum induction furnace smelting, and degree of vacuum is 10
-3Torr is produced steel ingot, also can adopt the VOD method to smelt;
The Chemical composition of steel ingot satisfies: carbon C≤0.12%; Silicon Si＜1.0%; Manganese Mn≤0.8%; Sulphur S≤0.03%; Phosphorus P＜0.0035%; Chromium Cr24-27%; Titanium Ti5c-0.8%, all the other are Fe, and 5c is 5 times a Kohlenstoffgehalt, and chromium Cr content is controlled at the 24-25% scope, the easier cold working of carrying out the back;
The gas content of steel ingot is a nitrogen N
2, hydrogen H
2, oxygen O
2All at 30ppm;
The sonims permitted value of steel ingot: do not allow silicate or oxide to become band or netted;
The macrostructure of steel ingot, the degree of depth of shrinkage cavity and center porosity is no more than the 4-5% of steel ingot height;
The grain size of steel ingot is even, and the surface does not allow crackle, scabs;
II. the operation of Duan Zaoing, compression ratio K is defined as between the 8-12, to guarantee the favorable mechanical performance of pipe;
1050 ℃-1120 ℃ of the initial forging temperatures of forging processing, 800 ℃-850 ℃ of final forging temperatures to obtain the ingot rod of thin grain structure, prevent fragility;
III. the bore a hole operation of hot rolling,
(1) will forge rod and be processed as pipe, and select minimum perforation unit for use, Φ 35 Mannesmann piercing units and Φ 30 three-roll hot-rolling mill groups are to reduce the processing passage;
(2) operation of heating of pipe blank,
Pipe is heated, and according to low temperature evenly heating at a slow speed, the principle of high temperature rapid heating generates with the fragility that effectively overcomes steel, avoids heating to crack, specifically:
A. pipe heats with stove, and 600 ℃ of slowly evenly heating were in the past heated 2 hours;
B. furnace temperature rises to 900 ℃ and is incubated holding time 20-30 minute;
C. continue heating, when furnace temperature rises to 1050 ℃-1100 ℃;
According to preorder can effectively make on the pipe section and length on homogeneous heating, avoid the appearance of Carbide network; Avoid too high because of temperature rise, thick grain structure appears in steel pipe, reduces the high-temp plastic of steel.
(3). the operation of perforation hot rolling,
A. the pipe of III. (2) preface is bored a hole then,
B. continuously hot rolling, 850 ℃ of finishing temperatures, amount of deformation is controlled at 45%, makes pipe have good plastic working tissue and improves the metal structure performance;
Control the parameters such as upper and lower, finishing temperature, amount of deformation of heating-up temperature in the operation of perforation hot rolling well, the structure that can effectively control metal inside changes, and improves the mechanical property of steel pipe;
IV. cold worked operation
Tubing to III. (3) preface hot-roll forming carries out cold working, and step is:
First preface is rolling, and through aligning, reconditioning, cut off, go up mill milling after the pickling, amount of deformation is controlled at 40.5%;
Second preface is rolling, the first preface milling material annealed, and 500 ℃ of the charging temperatures of described annealing, when furnace temperature rose to 850 ℃, holding time was at 50 minutes, and the water-cooled of coming out of the stove goes up the mill milling amount of deformation and is controlled at 45% after aligning, the pickling;
The 3rd preface is rolling, the second preface milling material annealed, and 500 ℃ of the charging temperatures of described annealing, when furnace temperature rose to 850 ℃, holding time was at 40 minutes, the water-cooled of coming out of the stove, mill milling after the aligning pickling, amount of deformation is controlled at 45%;
The 4th preface empty sinking is annealed to the 3rd preface milling material, 500 ℃ of the charging temperatures of described annealing, and when furnace temperature rose to 850 ℃, holding time was at 30 minutes, the water-cooled of coming out of the stove, empty sinking again, amount of deformation is controlled at 14.5%;
The 5th preface cold-drawn subtracts wall, the 4th preface empty sinking pipe annealed, and 500 ℃ of the charging temperatures of annealing, when furnace temperature rose to 850 ℃, holding time was at 25 minutes, and wall is aligned, cuts off, subtracted to the water-cooled of coming out of the stove again, and amount of deformation is controlled at 29.5%;
The 6th preface cold-drawn subtracts wall, the 5th preface empty sinking pipe annealed, and 500 ℃ of the charging temperatures of annealing, when furnace temperature rose to 850 ℃, holding time was at 23 minutes, and wall is aligned, cuts off, subtracted to the water-cooled of coming out of the stove again, and amount of deformation is controlled at 21.5%;
The 7th preface empty sinking subtracts the wall pipe to the cold-drawn of the 6th preface and anneals, 500 ℃ of the charging temperatures of described annealing, and when furnace temperature rose to 850 ℃, holding time was at 20 minutes, the water-cooled of coming out of the stove, empty sinking again, amount of deformation is controlled at 13.5%;
The 8th preface empty sinking is annealed to the empty sinking pipe of the 7th preface, 500 ℃ of the charging temperatures of annealing, and when furnace temperature rose to 850 ℃, holding time was at 15 minutes, the water-cooled of coming out of the stove, empty sinking again, amount of deformation is controlled at 18.5%;
The 9th preface empty sinking is annealed to the empty sinking pipe of the 8th preface, 500 ℃ of the charging temperatures of annealing, and when furnace temperature rose to 850 ℃, holding time was at 13 minutes, the water-cooled of coming out of the stove, empty sinking again, amount of deformation is controlled at 24.5%;
The tenth preface is rolling, the empty sinking pipe of the 9th preface annealed, and 500 ℃ of the charging temperatures of annealing, when furnace temperature rose to 850 ℃, holding time was at 10 minutes, the water-cooled of coming out of the stove, aligning, pickling roll out finished product again, and amount of deformation is controlled at 47.5%;
The 11 preface finished products carries out vacuum annealing to the production tube of the tenth preface, and 500 ℃ of the charging temperatures of described vacuum annealing when furnace temperature rises to 880 ℃, are incubated 30 minutes, the air cooling of coming out of the stove.
5. the specific embodiment of cold worked operation is:
The car optical wand perforation of Φ 35 is the tubing of Φ 35.5 * 4.5-5, is rolled into the tubing of Φ 30 * 3; Through aligning, reconditioning, cut off, after the pickling processes, last LD-30 milling train rolls into Φ 26 * 2, amount of deformation is 40.5% tubing; Anneal again, behind the aligning, pickling, last LD-30 milling train rolls into Φ 23 * 1.2, amount of deformation is 45% tubing; Anneal again, behind the aligning, pickling, last LD-30 milling train rolls into Φ 21 * 0.7, amount of deformation is 45% tubing; Anneal again, empty sinking is to Φ 17 * 0.75, amount of deformation is 14.5% tubing; After annealing, align, cutting off, subtracting wall with long plug is Φ 16.1 * 0.55, and amount of deformation is 29.5% tubing; After annealing, align, cutting off, subtracting wall with long plug again is Φ 15.4 * 0.45, and amount of deformation is 21.5% tubing; Anneal again, empty sinking is to Φ 12.7 * 0.48, amount of deformation is 13.5% tubing; Continue annealing, empty sinking to Φ 9.7 * 0.5, amount of deformation is 18.5% tubing; Continuation annealing, empty sinking are 24.5% tubing to Φ 7.1 * 0.55 amount of deformation; Continue annealing, aligning, pickling, it is 47.5% tubing that last LDD6-12 milling train rolls into Φ 6.3 * 0.3-0.35 amount of deformation; Production tube is carried out vacuum annealing, and 500 ℃ of charging temperatures when furnace temperature rises to 880 ℃, are incubated 30 minutes, the air cooling of coming out of the stove.
Make difficult principal element below in conjunction with the Ferritic Stainless Steel weldless tube, set forth the corresponding measure of this method:
The fragility problem of Ferritic Stainless Steel
1. α fragility
Known, α is mutually hard and crisp, contains the alloy of chromium in the 15-70% scope, will produce α fragility by 540-815 ℃ of heating, and heating produces the fastest of α fragility about 700-800 ℃; Contain chromium and get over high alloy, α fragility is big more; Molybdenum Mo, silicon Si, niobium Ni, manganese Mn etc. can promote α to generate mutually, and carbon C, nitrogen N suppress its generation; And contain the steel (as 446 steel) of chromium up to 25-30%, when heat treatment,, just can cause this fragility if rate of cooling is slow; The generation of α phase fragility improves the hardness of steel, has but significantly reduced the plasticity of steel, and notch toughness and corrosion resisting property bring problem for processing and use.
The present invention's method with water-cooled in cold worked annealing in process has solved this problem emphatically, when α phase phenomenon occurs, can be by being heated to temperature more than 800 ℃, the insulation certain hour makes its dissolving back water-cooled fast, be cooled to room temperature, eliminate α phase phenomenon with this.
2.475 ℃ fragility
Known, contain the ferrite shaped steel of chromium more than 12%, heating is when 340 ℃ of-540 ℃ of temperature, behind certain hour, the hardness of steel increases, impact toughness significantly reduces, and the most serious during especially with 475 ℃, hardness is the highest, 27 chromium steel are after heating in 475 ℃ * 100 hours, the tensile strength of its normal temperature increases by 50%, and yield strength increases by 150%, and specific elongation is vanishing then; The existence of elements such as aluminium Al, silicon Si, molybdenum Mo, niobium Nb, titanium Ti, manganese Mn, vanadium V in the steel will promote this fragility to produce.
The present invention is in the annealing process of cold machining process, science with holding time determines to have solved emphatically this problem, when 475 ℃ of fragility problems occurring, can be by steel being heated to more than 600 ℃, and the insulation regular hour, the way that is chilled to room temperature is fast eliminated, and it is easy more that the high more fragility of temperature is eliminated, and normally is treated to suitable between 700-800 ℃.
3. high-temperature brittleness
High-temperature brittleness is to be accompanied by grain enlargement and the fragility brought, when steel are heated to 950 ℃ more than-1000 ℃, be chilled to room temperature and will produce this high-temperature brittleness, the steel chromium content is high more, this fragility is serious more, as 446 steel, when heating in 1000 ℃ * 100 hours, the bend angle under the normal temperature is zero, so High Chrome Steel is when heat treatment, it is overheated to avoid most, the fundamental cause that produces high-temperature brittleness is a carbon, the bond of interstitial elements such as nitrogen is separated out at crystal boundary, therefore, reduces the carbon in the steel, nitrogen content, reduce even avoid carbon, the precipitation of nitrogen compound is separated out, and can improve high-temperature brittleness greatly.The present invention is defined as 850-880 ℃ with annealing temperature and has just solved this problem emphatically in the annealing operation of cold machining process.
4. intergranular corrosion
The stainless intergranular corrosion of ferrite type, heating-up temperature was cooled off fast in time more than 860 ℃, material by sensitization after, can produce intergranular corrosion, otherwise, if slowly cooling just can not produce sensitization.Heating-up temperature is in the time of 700-800 ℃, and heating can recover material through the short time, if slow cool down, even temperature increases, tubing does not produce intergranular corrosion yet.Add titanium Ti or niobium Nb, and when Ti 〉=6 * (C+N) or Nb 〉=8 * (C+N), just can prevent sensitization.When more than the machining object heating-up temperature to 860 ℃, cooling has just solved this problem emphatically fast in the cold working operation in the present invention.
The control problem of grain size
System of heat treatment process of the present invention is that follow-up cold working is had laid a good foundation.Growing up of crystal grain is relevant with the cold deformation before the material processed.When cold deformation is about 5%, just produce very large crystal grain after the heating, it is high more to contain chromium, and it is big more that crystal grain is grown.Therefore, for cold deformation, annealing temperature and holding time are all wanted strict requirement.Thickization of crystal grain, material will become fragile, and through deep-draw, after the cold working such as bending, is easy to generate rough surface and crackle, and intergranular corrosion is also serious.Intermediate annealing should be carried out as far as possible at low temperatures, and must guarantee its amount of deformation about 30% again, and heat-treatment of annealing system of the present invention has well solved this problem.
Plasticity is poor, difficult processing problems
Because the plasticity of Ferritic Stainless Steel is very poor, as 446 steel, according to the cold-drawn principle, flow of metal is in one to drawing and two stress phases to pressure, owing to have tensile stress in the stress phase, plastic deformation is poor during draw, yet relatively more difficult to inductile metal draw; According to cold rolling principle, the flow of metal process has reflected the material compressive stress state, it is poor to be fit to make plasticity, the tubing of drawing difficulty, cold rolling efficient is low, cost height, the efficient height of cold-drawn, so at making the very poor ferrite stainless steel pipe of plasticity, the present invention uses cold-drawn, cold rolling combination in cold machining process technology has solved this problem emphatically.
The present invention has solved the steel ingot problem of materials that meets this method condition emphatically in the operation of smelting, lay a good foundation for solving other each problems of producing the Ferritic Stainless Steel weldless tube.
After the preferred embodiment that describes in detail, be familiar with this technology personage and can clearly understand, can carry out various variations and modification not breaking away under following claim and the spirit, and the present invention also is not subject to the mode of execution of illustrated embodiment in the specification.
Claims (5)
1. minor diameter Ferritic Stainless Steel weldless tube manufacture method wherein, comprises following operation:
I. smelt grain size evenly, the steel ingot that scabs of flawless, nothing, and meet:
The Chemical composition of steel ingot: carbon C≤0.12%1; Silicon Si＜1.0%; Manganese Mn≤0.8%; Sulphur S≤0.03%; Phosphorus P＜0.0035%; Chromium Cr24-27%; Titanium Ti5c-0.8%, all the other are Fe, 5c is 5 times a Kohlenstoffgehalt;
The gas content of steel ingot is a nitrogen N
2, hydrogen H
2, oxygen O
2All at 30ppm;
The sonims permitted value of steel ingot: it is banded or netted not allow silicate or oxide to become to have;
The macrostructure of steel ingot, the degree of depth of shrinkage cavity and center porosity is no more than the 4-5% of steel ingot height;
II. the operation of Duan Zaoing, compression ratio is 8-12; The initial forging temperature that forges processing is 1050 ℃-1120 ℃, 800 ℃-850 ℃ of final forging temperatures;
III. the bore a hole operation of hot rolling,
(1). will forge rod and be processed as pipe;
(2). the operation of heating of pipe blank,
A. evenly heat pipe with stove, heated 2 hours, to 600 ℃;
B. when rising to 900 ℃, furnace temperature is incubated holding time 20-30 minute;
C. continue heating, make furnace temperature rise to 1050 ℃-1100 ℃;
(3) operation of perforation hot rolling,
A. to III. (2). the pipe perforation after the preface heating,
B. to the pipe continuously hot rolling of (3) .a preface perforation, 850 ℃ of finishing temperatures, amount of deformation is controlled at 45%;
IV. cold worked operation
To the tubing of preface III. hot-roll forming carry out cold rolling, empty sinking successively, cold-drawn subtracts wall, empty sinking again, finished products, makes the Ferritic Stainless Steel weldless tube.
2. minor diameter Ferritic Stainless Steel weldless tube manufacture method according to claim 1, it is characterized in that: described smelting procedure is to use vacuum induction furnace smelting, its degree of vacuum is 10
-3Torr.
3. minor diameter Ferritic Stainless Steel weldless tube manufacture method as claimed in claim 2, it is characterized in that: chromium content is controlled at 24-25%.
4. as the described minor diameter Ferritic Stainless Steel of one of claim 1-3 weldless tube manufacture method, it is characterized in that: the concrete operation of described cold working is:
First preface is rolling, and through aligning, reconditioning, cut off, go up mill milling after the pickling, amount of deformation is controlled at 40.5%;
Second preface is rolling, and the first preface milling material is annealed, and goes up the mill milling amount of deformation after aligning, the pickling and is controlled at 45%;
The 3rd preface is rolling, the second preface milling material annealed, and mill milling after the aligning pickling, amount of deformation is controlled at 45%;
The 4th preface empty sinking is annealed to the 3rd preface milling material, empty sinking again, and amount of deformation is controlled at 14.5%,
The 5th preface cold-drawn subtracts wall, and the 4th preface empty sinking pipe is annealed, and aligns, cuts off, subtracts wall again, and amount of deformation is controlled at 29.5%,
The 6th preface cold-drawn subtracts wall, and the 5th preface empty sinking pipe is annealed, and aligns, cuts off, subtracts wall again, and amount of deformation is controlled at 21.5%,
The 7th preface empty sinking subtracts the wall pipe to the cold-drawn of the 6th preface and anneals, empty sinking again, and amount of deformation is controlled at 13.5%,
The 8th preface empty sinking is annealed to the empty sinking pipe of the 7th preface, empty sinking again, and amount of deformation is controlled at 18.5%,
The 9th preface empty sinking is annealed to the empty sinking pipe of the 8th preface, empty sinking again, and amount of deformation is controlled at 24.5%,
The tenth preface is rolling, and the empty sinking pipe of the 9th preface is annealed, and aligning, pickling roll out finished product again, and amount of deformation is controlled at 47.5%,
The 11 preface finished products carries out vacuum annealing to the production tube of the tenth preface.
5. minor diameter Ferritic Stainless Steel weldless tube manufacture method as claimed in claim 4 is characterized in that: described cold working operation:
Second preface is rolling, 500 ℃ of the charging temperatures of described annealing, and when furnace temperature rose to 850 ℃, holding time was at 50 minutes, the water-cooled of coming out of the stove;
The 3rd preface is rolling, 500 ℃ of the charging temperatures of described annealing, and when furnace temperature rose to 850 ℃, holding time was at 40 minutes, the water-cooled of coming out of the stove;
The 4th preface is rolling, 500 ℃ of the charging temperatures of described annealing, and when furnace temperature rose to 850 ℃, holding time was at 30 minutes, the water-cooled of coming out of the stove;
The 5th preface cold-drawn subtracts wall, 500 ℃ of the charging temperatures of described annealing, and when furnace temperature rose to 850 ℃, holding time was at 25 minutes, the water-cooled of coming out of the stove;
The 6th preface cold-drawn subtracts wall, 500 ℃ of the charging temperatures of described annealing, and when furnace temperature rose to 850 ℃, holding time was at 23 minutes, the water-cooled of coming out of the stove;
The 7th preface cold-drawn subtracts wall, 500 ℃ of the charging temperatures of described annealing, and when furnace temperature rose to 850 ℃, holding time was at 20 minutes, the water-cooled of coming out of the stove;
The 8th preface empty sinking, 500 ℃ of the charging temperatures of described annealing, when furnace temperature rose to 850 ℃, holding time was at 15 minutes, the water-cooled of coming out of the stove;
The 9th preface empty sinking, 500 ℃ of the charging temperatures of described annealing, when furnace temperature rose to 850 ℃, holding time was at 13 minutes, the water-cooled of coming out of the stove;
The tenth preface empty sinking, 500 ℃ of the charging temperatures of described annealing, when furnace temperature rose to 850 ℃, holding time was at 10 minutes, the water-cooled of coming out of the stove;
The 11 preface finished products, 500 ℃ of the charging temperatures of described vacuum annealing when furnace temperature rises to 880 ℃, are incubated 30 minutes, the air cooling of coming out of the stove.
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| CN 200410019977 CN1721753A (en) | 2004-07-14 | 2004-07-14 | Manufacturing method of ferritic stainless steel seamless pipe with small diameter |
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| CN 200410019977 CN1721753A (en) | 2004-07-14 | 2004-07-14 | Manufacturing method of ferritic stainless steel seamless pipe with small diameter |
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| CN101713019B (en) * | 2008-10-07 | 2011-05-04 | 上海高泰稀贵金属股份有限公司 | Method for manufacturing spaceflight high-temperature alloy GH3600 fine thin-wall seamless pipe |
| CN102140574A (en) * | 2011-05-11 | 2011-08-03 | 北京冶金正源科技有限公司 | Annealing process for improving deep drawability of 430 ferrite stainless steel |
| CN101708511B (en) * | 2007-12-13 | 2011-09-28 | 攀钢集团四川长城特殊钢有限责任公司 | Method for manufacturing pure titanium seamless tubes |
| CN102537531A (en) * | 2011-12-06 | 2012-07-04 | 南京宝泰特种材料股份有限公司 | Titanium/steel composite pipeline and preparation method thereof |
| CN103361473A (en) * | 2013-06-04 | 2013-10-23 | 杭州锅炉集团股份有限公司 | Thermal treatment method for preventing stainless steel from being sensitized in water chamber of high-pressure heater |
| CN103966525A (en) * | 2014-05-21 | 2014-08-06 | 攀钢集团江油长城特殊钢有限公司 | High-chromium and high-molybdenum ferrite stainless steel seamless pipe and manufacturing method thereof |
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| CN102140574A (en) * | 2011-05-11 | 2011-08-03 | 北京冶金正源科技有限公司 | Annealing process for improving deep drawability of 430 ferrite stainless steel |
| CN102140574B (en) * | 2011-05-11 | 2012-09-05 | 北京冶金正源科技有限公司 | Annealing process for improving deep drawability of 430 ferrite stainless steel |
| CN102537531A (en) * | 2011-12-06 | 2012-07-04 | 南京宝泰特种材料股份有限公司 | Titanium/steel composite pipeline and preparation method thereof |
| CN103361473A (en) * | 2013-06-04 | 2013-10-23 | 杭州锅炉集团股份有限公司 | Thermal treatment method for preventing stainless steel from being sensitized in water chamber of high-pressure heater |
| CN103966525A (en) * | 2014-05-21 | 2014-08-06 | 攀钢集团江油长城特殊钢有限公司 | High-chromium and high-molybdenum ferrite stainless steel seamless pipe and manufacturing method thereof |
| CN103966525B (en) * | 2014-05-21 | 2016-05-11 | 攀钢集团江油长城特殊钢有限公司 | A kind of chromium high molybdenum high ferritic stainless steel seamless tubular goods and manufacture method thereof |
| CN105478522A (en) * | 2015-11-19 | 2016-04-13 | 攀钢集团成都钢钒有限公司 | Small-caliber nuclear power seamless steel tube producing and machining method |
| CN106984668A (en) * | 2017-04-25 | 2017-07-28 | 周振江 | The disposable high-frequency heating method for completing solid drawn tube annealing aligning processing quenching |
| CN108517478A (en) * | 2018-04-04 | 2018-09-11 | 浙江久立特材科技股份有限公司 | A kind of manufacturing process of the small-bore accurate pipe of 718 alloy |
| CN108517478B (en) * | 2018-04-04 | 2019-10-29 | 浙江久立特材科技股份有限公司 | A kind of manufacturing process of the small-bore accurate pipe of 718 alloy |
| CN110923569A (en) * | 2019-11-11 | 2020-03-27 | 南京工程学院 | Nuclear grade high-strength high-intergranular corrosion-resistant large-section stainless steel forged pipe and manufacturing method thereof |
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