CN100374241C - OOCr22Ni5MO3N high-nitrogen steel seamless steel pipe manufacturing method - Google Patents
OOCr22Ni5MO3N high-nitrogen steel seamless steel pipe manufacturing method Download PDFInfo
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- CN100374241C CN100374241C CNB2005100251443A CN200510025144A CN100374241C CN 100374241 C CN100374241 C CN 100374241C CN B2005100251443 A CNB2005100251443 A CN B2005100251443A CN 200510025144 A CN200510025144 A CN 200510025144A CN 100374241 C CN100374241 C CN 100374241C
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 100
- 239000010959 steel Substances 0.000 title claims abstract description 100
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 69
- 238000005097 cold rolling Methods 0.000 claims abstract description 50
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 28
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 28
- 239000004571 lime Substances 0.000 claims abstract description 28
- 239000012188 paraffin wax Substances 0.000 claims abstract description 3
- 238000005482 strain hardening Methods 0.000 claims description 49
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 27
- 235000014121 butter Nutrition 0.000 claims description 23
- 238000005554 pickling Methods 0.000 claims description 18
- 238000005096 rolling process Methods 0.000 claims description 17
- 238000005242 forging Methods 0.000 claims description 15
- 239000007787 solid Substances 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 5
- 238000005461 lubrication Methods 0.000 claims description 4
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 8
- 230000001050 lubricating effect Effects 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 238000010622 cold drawing Methods 0.000 abstract 5
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000003760 tallow Substances 0.000 abstract 1
- 229910001220 stainless steel Inorganic materials 0.000 description 31
- 239000010935 stainless steel Substances 0.000 description 30
- 239000000047 product Substances 0.000 description 29
- 239000011265 semifinished product Substances 0.000 description 11
- 239000000463 material Substances 0.000 description 7
- 239000002585 base Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000000137 annealing Methods 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000003359 percent control normalization Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 241000370738 Chlorion Species 0.000 description 1
- 229910000593 SAF 2205 Inorganic materials 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000004276 ovality control Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
The present invention relates to a pipe making technical method for seamless steel pipes made of OOCr22Ni5MO3N high nitrogen steel. The method is characterized in that the method adopts a hot processing perforating step together with a cold drawing or cold rolling cold processing step to produce OOCr22Ni5MO3N high nitrogen steel seamless pipes. The method has the technical scheme that firstly, the perforation is carried out, and the heating temperature of a pipe blank is from 1100 to 1130 DEG C; the ovality is regulated from 1.07 to 1.09; secondly, the cold processing is carried out, which comprises (1) pass deformation quantity whose cold drawing is at most 30% and cold rolling is at most 60%, (2) cold drawing and (3) cold rolling; when the cold drawing is carried out for a coreless rod, a layer of tallow lime is made on the surface of the pipe blank in a former lubricating step and then is erased for coating paraffin, and a cover die is arranged in the front of a finished product die; when the cold drawing is carried out for a core rod, the wall quantity of a steel pipe is reduced by 0.5 to 0.75mm, and simultaneously the lime is used for lubricating the inner wall and the outer wall of the steel pipe; in the step of cold rolling, a semi-circular hole type cold rolling pipe machine is adopted, and the width B of a hole-shaped opening is from 2*R+3 to 3.2mm; when the cold rolling is carried out for a finished product, a deformation zone is rolled by reducing diameters and wall thicknesses and then is moved backwards; thirdly, other steps are carried out according to normal technologies. The method has the advantages of reasonable technology, strong operability, 56.79% of high pipe making finished product rate, low production cost, stable quality of a finished steel pipe and obvious economic and social benefits.
Description
Technical field
The present invention relates to relate to pressure processing (tube-making process) production method of metallurgy industry stainless-steel seamless pipe, refer in particular to the tube-making process method of nitrogen bearing duplex stainless steel seamless steel pipe.
Background technology
Stainless-steel seamless pipe is common metallurgical metallic article.The tube-making process production method is: the finishing in hot-working (extruding, perforation) or bore hole operation and road, back (tack, pickling, lubricated etc.) operation, solid pipe is processed into semi-finished product cold working (cold-drawn or cold rolling) operation and necessary " deoil, anneal, aligning, finishing (tack, pickling, lubricated etc.) " operation of hollow hollow billet (hollow forging) → multi-pass, pipe is processed into semi-finished product steel pipe → finished product cold working (cold-drawn or cold rolling; Be circulated to finished product by the finished product size) operation and necessary later process, be processed into specification, the standard compliant fished pipe of quality with the semi-finished product steel pipe.
At present, the master operation of domestic stainless-steel seamless pipe hollow forging production is that (production process of seamless steel pipe hollow forging has three kinds to the hot-working perforation process: hot-working extruding, hot-working perforation or bore hole.The bore hole operation is: bore hole → hollow billet → comprise tack, pickling, finishing measure such as lubricated; Its advantage is: varietal adaptation is strong, can process the high alloy material of some thermoplasticity differences, and shortcoming is: the lumber recovery of making hollow billet all is lower than 40%, and the processing charges of bore hole is high again, the cycle is long, inapplicable production in enormous quantities.The hot-working extrusion process is: raw material preparation → heating → extruding → hollow billet → comprise tack, pickling, finishing measure such as lubricated; Be characterized in: the extruding hollow billet need bore a hole that almost penetrates on pipe, and then the interior external mold of making by special material is at the squeeze pressure compacted under hollow billet of several kilotons; Advantage is: deformation condition is better, and varietal adaptation is strong, but the relatively poor high alloy material of production thermoplasticity, shortcoming is: the equipment investment of extruder is very big, and tool and mould, the required preparation machine of extruding are all quite huge, domestic also few the application.): raw material preparation → heating → perforation → hollow billet → finishing (tack, pickling, lubricated etc.); Its advantage is: invest little, production cost is low, and shortcoming is: because the particularity of perforation deformation condition, varietal adaptation is narrower, can produce general ferrite, austenite, the seamless hollow billet of ferrite+austenitic stainless steel, be unfavorable for the high alloy material of production thermoplasticity difference.Therefore, the stainless-steel seamless pipe of hot-working perforation process production all is a thermoplasticity material preferably, the cold-forming property of these materials is also better, and an important indicator of judge cold deformation ability, be exactly that (thermoplasticity is material preferably for yield strength, yield strength is also lower), be 200～300Mpa as the yield strength of austenitic stainless steel.
(yield strength is higher than austenitic stainless steel to two phase stainless steel, thermoplasticity is relatively poor) be more special stainless steel, have high strength, superior corrosion resistance energy and characteristics such as anticorrosion stress-resistant performance, pitting resistance, the two-phase stainless steel seamless steel tube also more and more is subjected to the favor of industry such as petrochemical industry, urea and system alkali.(production method of hollow forging all adopts extruder production in the external two phase stainless steel tube-making technology to produce the domestic tube-making technology of two-phase stainless steel seamless steel tube with " hot-working perforation process+cold working (cold-drawn or cold rolling) operation ", cold deformation is in cold rolling mode) only limit to general common two phase stainless steel (about yield strength 400Mpa), the main trade mark has: 0Cr17Mn13Mo2N (A4), 00Cr18Ni5Mo3Si2 (3RE60), and 00Cr22Ni5Mo3N hangs down N steel (S31803; The content 0.08%～0.20% of N element is generally by 0.10% control).And domestic and external steel and iron industry is compared with technical elements (especially for high-grade stainless steel) at total quality, still has a certain distance.Homemade high-grade two phase stainless steel steel pipe is in blank or follow-up state substantially in the application in the energy, chemical industry Important Project field.
Continuous increase along with national energy gross demand, the contradiction of resource structures irrational distribution is outstanding day by day, and the multinomial national energy (for example projects to divert gas and electricity from the western to the eastern regions etc.) Important Project construction need be used a large amount of high-quality stainless steel materials (as: China National Petroleum Corporation (CNPC) hold in the Kuerle, Xinjiang " West-east Gas surface construction project non-standard equipment is with the high N two-phase stainless of 00Cr22Ni5Mo3N steel seamless steel tube).The service condition harshness ((be on close level in SAF2205 by the high N steel of 00Cr22Ni5Mo3N of chlorion 〉=100677mg/L); The content 0.15%～0.30% of N element, general by 0.20% control), because N content is higher, under the invigoration effect of N element, the general two phase stainless steel of its yield strength ratio is higher, yield strength will surpass 500Mpa (along with the increase of deflection in the cold working process, its yield strength will be above 1000Mpa), so no matter processing characteristics is relatively poor (is hot-working, still cold working), this is now domestic to produce the cold deformation steel pipe production equipment of austenite stainless steel seamless steel tube, tool and mould, technology can't be obtained, domestic do not have the successful precedent of application in batches (in the actual tubulation production, lumber recovery is extremely low, mainly scraps reason to be: perforated pipe has face crack and steel bonding, defective such as cracking end to end; Broken end during cold-drawn, plucking and load mould; When cold rolling roll folding, the cracking.And during actual tubulation is produced, the tool and mould well damage of cold pilger mill).
Summary of the invention
The present invention develops the tube-making process method of the high nitrogen steel seamless steel tube of a kind of 00Cr22Ni5Mo3N, heating cycle, ovality control by the hot-working perforation process, the special lubricated control in the preceding road of fished pipe cold-drawn of cold working operation, and the design of the semicircle pass of cold rolling process cold pilger mill, the control of plug deformed area when finished product is rolling, produce specification, the high nitrogen steel seamless steel tube of the standard compliant finished product 00Cr22Ni5Mo3N of quality.
The tube-making process method of the high nitrogen steel seamless steel tube of 00Cr22Ni5Mo3N provided by the invention, it is characterized in that: adopt hot-working perforation process+cold-drawn or cold rolling cold working operation, solid pipe is processed into specification, the high nitrogen steel seamless steel tube of the standard compliant finished product 00Cr22Ni5Mo3N of quality.
The first, the hot-working perforation process is processed into hollow hollow billet (hollow forging) with solid pipe, and the finishing in road, back (tack, pickling, lubricated etc.) operation, and technical essential is:
The heating-up temperature of the solid pipe of the high nitrogen steel of 00Cr22Ni5Mo3N is 1100～1130 ℃, (the solid pipe heating-up temperature of the high nitrogen steel of 00Cr22Ni5Mo3N is lower than 1100 ℃ to be controlled at 1105～1125 ℃, will produce hollow billet head crackle, shorten head lifetime, influence the inner surface quality of hollow billet.If be higher than 1130 ℃, the hollow billet afterbody crackle and the cracking that promptly can occur extending cause the steel bonding of guide plate and roll, influence the outer surface quality of hollow billet.Austenitic stainless steel pipe base heating-up temperature is generally at 1060～1130 ℃, and general two phase stainless steel pipe heating-up temperature is generally at 1080～1150 ℃.The thermoplasticity of two phase stainless steel is relatively poor, and be because austenite is different with the deformational behavior of ferritic phase mutually when hot-working: the main softening process during the ferritic steel distortion is dynamically to recover when leaning on strain, and promptly the subgrain meta offsets moving; And the main softening process in austenitic stainless steel when distortion is the dynamic recrystallization when strain is higher than critical value; Because the softening process difference of two-phase, uneven stress and strain distribution causes crackle nucleation and the expansion in phase boundary easily in the hot-working austenite-ferrite two phase stainless steel.)；
Perforation adjustment ovality is controlled at 1.07～1.09, and (perforation of the high nitrogen steel pipe of 00Cr22Ni5Mo3N base is adjusted ovality less than 1.07, and is totally unfavorable to the service life of guide plate and roll; Perforation is adjusted ovality greater than 1.09, because the thermoplasticity of material is poor, hollow billet will produce serious external crack.The perforation of Austenitic stainless steel pipe base is adjusted ovality more than 1.1, and ovality about 1.1 is adjusted in general two phase stainless steel pipe perforation.)；
Other Austenitic stainless steel pipe base hot-working perforation processes are routinely carried out;
Through the hollow hollow billet (hollow forging) that the hot-working perforation process is produced, enter the road, back and handle;
The tack in back road, pickling, finishing procedure Austenitic stainless steel pipe production process routinely such as lubricated are carried out.
The second, the semi-finished product cold-drawn of multi-pass or cold rolling cold working operation, and necessary " deoil, anneal, aligning, finishing (tack, pickling, lubricated etc.) " operation are processed into the semi-finished product steel pipe with hollow forging; Finished product cold-drawn of a time or cold rolling cold working operation, and necessary " deoil, anneal, aligning, finishing (tack, pickling, lubricated etc.) " operation are processed into fished pipe with the semi-finished product steel pipe; Technical essential is:
(1) cold working cold-drawn operation can be divided into sink drawing and two kinds of situations of plug draw are arranged
(A) pass deformation 20～30%, pass deformation be exactly a cold working passage pipe deflection summation (for austenitic stainless steel, the pass deformation 30～40% of cold-drawn operation.This be because: the yield strength of austenitic stainless steel is 200～300Mpa, and the yield strength of general two phase stainless steel is more than two times of austenitic stainless steel, reaches about 400Mpa; Because of the invigoration effect of N element, 00Cr22Ni5Mo3N is high, and the N two phase stainless steel is higher than general two phase stainless steel, reaches more than the 500Mpa, and along with the increase of deflection in the cold working process, its yield strength will be above 1000Mpa.In addition, two phase stainless steel flow harden effect is bigger, especially be difficult for surrender at the distortion initial stage, and resilience is also big in deformation process, compares austenitic stainless steel and should adopt less deflection as far as possible.)；
(B) sink drawing (can be used for the steel pipe semi-finished product cold working of big specification and than the steel pipe finished product cold working of small dimension, is particularly suitable for the steel pipe finished product cold working than small dimension.Because pass deformation is less, the production cycle is long, the general less steel pipe semi-finished product cold working that is used for big specification.Because the cold worked deflection of steel pipe finished product is less, and can avoid the mandrel fracture phenomenon of plug cold-drawn, through being usually used in the cold working of steel pipe finished product) when manufacturing a finished product steel pipe, can be " wiping two road butter lime ", also can be " paraffine when wiping one butter lime+cover die+draw ", prevent pipe plucking and load mould." wiping two road butter lime " is meant: in the lubricated operation in the preceding road of steel pipe finished product cold working, wipe behind one butter lime on the pipe surface, go up butter lime again one, wipe again that (annealing operation in road is to carry out after the cold working of steel pipe finished product under protective atmosphere, the butter lime on pipe surface can not be removed in annealing operation, must wipe; It is the best method that guarantees end product quality.Shortcoming is that process period is longer, and production cost is higher)." paraffine when wiping one butter lime+cover die+draw " is meant: in the lubricated operation in the preceding road of steel pipe finished product cold working, behind one butter lime, wipe on the pipe surface; During the finished product cold-drawn, coat paraffin (increasing the processing and lubrication of pipe) on the pipe surface, and in 1 cover die of finishing die front arrangement (active length of prolongation pipe deformed area, under the constant situation of pass deformation, reduce the short time set amount of pipe), improve product quality (the rational method of steel pipe finished product.Can guarantee the gross of finished product, and the production process cycle is shorter, production cost is lower, saves time and manpower).
(C) there is the plug draw (to can be used for the steel pipe semi-finished product cold working of big specification, be not suitable for steel pipe finished product cold working than small dimension.This be because: be used for cold worked plug, head is thinner, and afterbody is thicker; When finished product steel pipe specification hour, as φ 19 * 3.0mm steel pipe, the thinnest place of plug head diameter is 13mm only, and is fragile) time: the steel pipe wall thickness reducing amount is controlled at 0.5-0.75mm and (if wall thickness reducing amount is bad greater than 1mm or steel pipe inside and outside wall lubricating quality, internal hair and outer hair even broken end phenomenon promptly occurs.Conventional austenitic stainless steel steel pipe wall thickness reducing amount is controlled at more than the 1mm.); Simultaneously, adopt the inside and outside wall of the lubricated steel pipe of lime, guarantee the lubricating quality (steel pipe inside and outside wall lubricating quality is good, the 00Cr22Ni5Mo3N two phase stainless steel steel pipe that draw is qualified continuously) of steel pipe inside and outside wall;
(2) cold working cold rolling process
(A) pass deformation≤60% (to austenitic stainless steel two speeches, deflection≤80% of cold rolling process);
(B) cold pilger mill of semicircle pass (by the shape of the cold rolling pass of cold working, can be divided into two kinds of situations of semicircle pass and annular distance type: as be used for the LG80 cold pilger mill of cogging, belong to the semicircle pass; As be used for deciding wall SKW75, go out the KPW50 high-speed cold Pilger mill of finished product, it is the import cold pilger mill, genus annular distance type) pass design is: pass A/F B=2 * R+3～3.2mm, R is that the pass radius is (based on the semicircle pass of rolling austenitic stainless steel, A/F B=2 * R+1～1.2mm is not suitable for rolling large batch of two phase stainless steel.The yield strength of the high N two phase stainless steel of 00Cr22NiSMo3N is more than two times of austenitic stainless steel, and material is difficult for surrender when cold rolling, and resilience is also big, and the opening degree of needed pass also increases; Can produce because of the opening of pass is uncomfortable behind the rolling several tons of two phase stainless steels and roll hair and roll folding, so adding at pass increases the opening of pass 1mm man-hour, be increased to 1.2mm when above steel pipe rolling be can free play, the operation of rolling is uncontrollable, causes tool and mould to damage in advance.)；
(C) cold rolling (cold rolling process is that plug cold working is arranged than the steel pipe finished product of small dimension, what be used for cold rolling process has that round bar shape plug afterbody is thick, head is thinner, during as φ 38 * 3.75mm → cold rolling φ 19 * 3.0mm, and plug tail diameter 30mm, head diameter is 13mm only, and is fragile.) time, the distribution of rolling deformation region deformation amount is: to head, (pass deformation is the plug summation of short time set amount everywhere to the short time set amount, and under the regular situation, the short time set amount is evenly distributed along the plug afterbody.) reduce progressively that (although this has increased the load in rolling when beginning, the plug size of at this moment bearing big roll-force is thicker, and the impact that can bear, rolling alternate stress ability are also corresponding bigger.), making diameter of mandrel thinner position relatively, the short time set amount is less relatively; avoid mandrel fracture, damage (when steel pipe is cold rolling, to damage phenomenon, not only influence the product quality of processed steel pipe if mandrel fracture takes place; also to shut down the transposing plug, influence ordinary production.); Simultaneously, diameter of mandrel 〉=the 15mm in rolling deformation zone, just move behind the rolling deformation district, in other words, be exactly that the pipe tube reducing subtracts the deformed region of wall at the thicker afterbody of plug, the middle part, thinner plug head plays the effect of pipe tube reducing, mandrel fracture when avoiding steel pipe cold rolling damages (when the high N two phase stainless steel of 00Cr22Ni5Mo3N is cold rolling, consider that two phase stainless steel is much bigger than the austenitic stainless steel resistance of deformation, reduced deflection as far as possible, but because its resistance of deformation is big, resilience is big, should finish equal wall part also at Ding Bi in former deformed area, increased the original load of only being responsible for equal wall effect of this section plug, and this section plug is just thinner, can not bear additional roll-force, occur resolving the plug phenomenon, cause shorten the service life of plug);
(3) other Austenitic stainless steel pipe cold working operations are routinely carried out;
(4) other cold working later process, comprise deoil, anneal, aligning and tack, pickling, finishing procedure such as lubricated, (the lubricated operation as road after the steel pipe cold working of routine is: " last one butter lime " in Austenitic stainless steel pipe production process execution routinely, one butter lime on the pipe surface just, and look the pipe surface quality, can not wipe the butter lime on pipe surface.Because the annealing operation in road is to carry out under oxidizing atmosphere after the cold working of steel pipe semi-finished product, can remove most butter lime, even there is the butter lime of small part in the pipe surface, do not influence the semi-finished product cold working of a time down.Save activity time.)。
Compared with prior art, the present invention has following advantage:
1. the technology meter is reasonable, and is workable;
2. the cold pilger mill of annular distance type, plug use firmly, long service life;
3.00Cr22Ni5Mo3N high N two-phase stainless steel seamless steel tube, steady quality;
4. tubulation lumber recovery height, production cost is low.
Specific embodiments:
Certain iron company steel tube factory implements patent of the present invention, adopt hot-working perforation process+cold-drawn or cold rolling cold working operation, (φ 80～100mm) is processed into 243 tons of specification (trimmed size φ 19～35mm) with the solid pipe of 22 stoves (350 tons), the high nitrogen steel seamless steel tube of the standard compliant finished product 00Cr22Ni5Mo3N of quality, the high nitrogen steel seamless steel tube of finished product 00Cr22Ni5Mo3N that is processed into φ 19 * 3.0mm with the solid pipe of φ 80mm is an example: first, the finishing procedure in hot-working perforation and road, back, with φ 80mm solid pipe peeling becoming φ 78mm pipe, the more solid pipe of φ 78mm is processed into the hollow hollow billet (hollow forging) of φ 80 * 6.5mm earlier; Second, the cold-drawn of multi-pass or cold rolling cold working and necessary " deoil, anneal, aligning, finishing " operation, hollow forging is processed into specification, the standard compliant φ 19 * 3.0mm of quality fished pipe: cold machining process one, hollow billet φ 80 * 6.5mm → cold rolling φ 57 * 4mm → cold rolling φ 25 * 2.9mm → cold-drawn (no plug) φ 19 * 3.0mm; Cold machining process two, hollow billet φ 80 * 6.5mm → cold-drawn (plug is arranged) φ 71 * 5.75mm → cold-drawn (plug is arranged) φ 63 * 5.0mm → cold-drawn (plug is arranged) φ 57 * 4.25mm → cold rolling φ 25 * 2.9mm → cold-drawn (no plug) φ 19 * 3.0mm; Cold machining process three, hollow billet φ 80 * 6.5mm → cold rolling φ 57 * 4.75mm → cold rolling φ 38 * 3.75mm → cold rolling φ 19 * 3.0mm.Technical essential is:
First, the hot-working perforation process, and the finishing in road, back (tack, pickling, lubricated etc.) operation, φ 78mm pipe is processed into the hollow hollow billet of φ 80 * 6.5mm (hollow forging): the heating-up temperature of the solid pipe of the high nitrogen steel of (1) 00Cr22Ni5Mo3N is 1100～1130 ℃, is controlled at 1105～1125 ℃; (2) perforation is adjusted ovality and is controlled at 1.07～1.09; (3) other Austenitic stainless steel pipe base hot-working perforation processes are routinely carried out; (4) the hollow hollow billet of producing through the hot-working perforation process (hollow forging) enters the road, back and handles; (5) tack, pickling in road, back, finishing procedure Austenitic stainless steel pipe production process routinely such as lubricated are carried out.
The second, the cold-drawn of multi-pass or cold rolling cold working operation, and necessary " deoil, anneal, aligning, finishing (tack, pickling, lubricated etc.) " operation, be processed into fished pipe with hollow forging:
(1) cold working cold-drawn (φ 25 * 2.9mm → cold-drawn φ 19 * 3.0mm; φ 80 * 6.5mm → cold-drawn φ 71 * 5.75mm → cold-drawn φ 63 * 5.0mm → cold-drawn φ 57 * 4.25mm; ) operation: (A) pass deformation 20～30%; (B) (during steel pipe finished product cold working φ 25 * 2.9mm → cold-drawn φ 19 * 3.0mm): can be " wiping two road butter lime ", also can be " paraffine when wiping one butter lime+cover die+draw " to sink drawing; (C) (during φ 80 * 6.5mm → cold-drawn φ 71 * 5.75mm → cold-drawn φ 63 * 5.0mm → cold-drawn φ 57 * 4.25mm): the steel pipe wall thickness reducing amount is controlled at 0.5～0.75mm, adopts the inside and outside wall of the lubricated steel pipe of lime the plug draw; The lubricated operation in back road is a common process: " last one butter lime ", and one butter lime on the pipe surface just, and look the pipe surface quality, can not wipe the butter lime on pipe surface;
(2) cold working cold rolling process (φ 80 * 6.5mm → cold rolling φ 57 * 4mm → cold rolling φ 25 * 2.9mm; φ 57 * 4.25mm → cold rolling φ 25 * 2.9mm; φ 80 * 6.5mm → cold rolling φ 57 * 4.75mm → cold rolling φ 38 * 3.75mm → cold rolling φ 19 * 3.0mm): (A) pass deformation≤60%; (B) design of the pass of the cold pilger mill of semicircle pass (the LG80 cold pilger mill that is used for φ 80 * 6.5mm → cold rolling φ 57 * 4mm cogging) is: pass A/F B=2 * R+3～3.2mm; (C) than the cold rolling (φ 38 * 3.75mm → cold rolling φ 19 * 3.0mm of the steel pipe finished product of small dimension; Be used for deciding wall SKW75, go out the KPW50 annular distance type high speed import cold pilger mill of finished product) time, the distribution of rolling deformation region deformation amount is: to head, the short time set amount progressively reduces along the plug afterbody; Simultaneously, diameter of mandrel 〉=the 15mm in rolling deformation zone, just move behind the rolling deformation district, in other words, be exactly that the pipe tube reducing subtracts the deformed region of wall at the thicker afterbody of plug, middle part, thinner plug head plays pipe tube reducing (receive footpath) effect, and the mandrel fracture when avoiding steel pipe cold rolling damages;
(3) other Austenitic stainless steel pipe cold working operations are routinely carried out;
(4) other cold working later process, comprise deoil, anneal, aligning and tack, pickling, finishing procedure such as lubricated, Austenitic stainless steel pipe production process is routinely carried out.
Technology of the present invention is reasonable, and is workable, and the plug of annular distance type cold pilger mill uses firmly (long service life), implements the high N two-phase stainless of the 00Cr22Ni5Mo3N steel seamless steel tube that the inventive method is produced, steady quality; The tubulation lumber recovery increases substantially, and up to 56.79%, production cost is low, and the high-grade two-phase stainless steel seamless steel tube of exploitation has been broken the situation of the long-term dependence on import of Important Project project, has tangible economic benefit and social benefit.
Claims (3)
1.00Cr22Ni5Mo3N the tube-making process method of high nitrogen steel seamless steel tube, it is characterized in that adopting hot-working perforation process+cold-drawn or cold rolling cold working operation, solid pipe be processed into specification, the high nitrogen steel seamless steel tube of the standard compliant finished product 00Cr22Ni5Mo3N of quality:
The first, the hot-working perforation process is processed into hollow hollow billet with solid pipe, hollow forging just, and the tack in road, back, pickling, finishing procedure such as lubricated, and technical essential is:
The heating-up temperature of solid pipe is 1100～1130 ℃, is controlled at 1105～1125 ℃;
Perforation is adjusted ovality and is controlled at 1.07～1.09;
Other Austenitic stainless steel pipe base hot-working perforation processes are routinely carried out;
Through the hollow hollow billet (hollow forging) that the hot-working perforation process is produced, enter the road, back and handle;
The tack in back road, pickling, finishing procedure such as lubricated, Austenitic stainless steel pipe production process is routinely carried out;
The second, the cold-drawn of multi-pass or cold rolling cold working operation, and necessary " deoil, anneal, aligning, tack, pickling, finishing such as lubricated " operation are processed into fished pipe with hollow forging; Technical essential is:
(1) cold working cold-drawn operation can be divided into sink drawing and two kinds of situations of plug draw are arranged
(A) pass deformation 20～30%, are the pipe deflection summations of a cold working passage;
When (B) sink drawing manufactures a finished product steel pipe, adopt the proper lubrication operation, prevent pipe plucking and load mould;
When (C) the plug draw being arranged: the steel pipe wall thickness reducing amount is controlled at 0.5～0.75mm; Simultaneously, adopt the inside and outside wall of the lubricated steel pipe of lime;
(2) cold working cold rolling process
(A) pass deformation≤60%;
(B) design of the pass of the cold pilger mill of semicircle pass is: pass A/F B=2 * R+3～3.2mm, R are the pass radiuses;
When (C) cold rolling than the steel pipe finished product of small dimension, the distribution of rolling deformation region deformation amount is: to head, the short time set amount progressively reduces along the plug afterbody, makes diameter of mandrel thinner position relatively, and the short time set amount is less relatively; Simultaneously, the diameter of mandrel 〉=15mm in rolling deformation zone, just tube reducing moves after subtracting the rolling deformation district of wall, in other words, be exactly the pipe tube reducing subtract wall deformed region at the thicker afterbody of plug, middle part, thinner plug head plays the effect of pipe tube reducing;
(3) other Austenitic stainless steel pipe cold working operations are routinely carried out;
(4) other cold working later process, comprise deoil, anneal, aligning and tack, pickling, finishing procedure such as lubricated, Austenitic stainless steel pipe production process is routinely carried out.
2. the tube-making process method of the high nitrogen steel seamless steel tube of 00Cr22Ni5Mo3N according to claim 1, the proper lubrication operation that it is characterized in that manufacturing a finished product the cold working sink drawing steel pipe adopts is: " wiping two road butter lime ", that is to say, in the lubricated operation in the preceding road of steel pipe finished product cold working, wipe behind one butter lime on the pipe surface, go up butter lime again one, wipe again.
3. the tube-making process method of the high nitrogen steel seamless steel tube of 00Cr22Ni5Mo3N according to claim 1, the proper lubrication operation that it is characterized in that manufacturing a finished product the cold working sink drawing steel pipe adopts is: " paraffine when wiping one butter lime+cover die+draw ", that is to say, in the lubricated operation in the preceding road of steel pipe finished product cold working, behind one butter lime, wipe, during the finished product cold-drawn on the pipe surface, coat paraffin on the pipe surface, and settle 1 cover die in the finishing die front.
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