CN104907353B - The production method of high chromium content ferrite stainless steel seamless steel pipe blank - Google Patents
The production method of high chromium content ferrite stainless steel seamless steel pipe blank Download PDFInfo
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- CN104907353B CN104907353B CN201510334811.XA CN201510334811A CN104907353B CN 104907353 B CN104907353 B CN 104907353B CN 201510334811 A CN201510334811 A CN 201510334811A CN 104907353 B CN104907353 B CN 104907353B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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Abstract
The invention belongs to metallurgical technology field, and in particular to a kind of production method of high chromium content ferrite stainless steel 2Cr25N seamless steel pipe blanks.The present invention provides a kind of production method of high chromium content ferrite stainless steel seamless steel pipe blank, and its technological process includes：Strip off the skin round billet → heating forging stock → perforation, wherein：Enter eleven punch 11 to round billet using punching machine and form hollow billet blank；In perforation process, overall diameter reduction ratio is 8~12%, top front reduction ratio≤4%, and ovality is 1.06~1.14.The method of the present invention has with short production cycle, the low feature of preparation cost；The Tube yield that gained blank is prepared is high.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to a kind of high chromium content ferrite stainless steel 2Cr25N seamless steel pipe blanks
Production method.
Background technology
High chromium content ferrite stainless steel 2Cr25N, height is measured containing Cr, and inoxidizability is better than the ferrite of Cr13 and Cr18 types not
Rust steel, is particularly suitable for being used under conditions of the fierce fluctuation of temperature.Work various can be produced under more than 950 DEG C loading condictions
Heat-resistant component.In traditional production technology, ferrite stainless steel pipe is mainly produced by the way of extrusion forming, specifically
Technological process is：It is main to use " strip off the skin forging stock → bore hole → sensing heating → reaming → sensing heating → extruding "；It is therein " to take off
Skin forging stock → bore hole → sensing heating → reaming " is its blank preparatory process, and this production process is relatively long, while bore hole, expansion
Hole process, in addition to its operation processing charges, while there is larger lumber recovery to lose.
The content of the invention
For drawbacks described above, the present invention provides a kind of life of new chromium 2Cr25N ferritic stainless seamless steel tube blanks high
Product method, the method for the present invention has with short production cycle, the low feature of preparation cost.
Technical scheme：
The present invention provides a kind of production method of high chromium content ferrite stainless steel seamless steel pipe blank, and its technological process includes：
Strip off the skin round billet → heating forging stock → perforation, wherein：
Enter eleven punch 11 to round billet using punching machine and form hollow billet blank；In perforation process, overall diameter reduction ratio be 8~
12%, top front reduction ratio is≤4%, and ovality is 1.06~1.14.
Further, rotary heating furnace, roller hearth type heating furnace or sensing heating are used in the heating forging stock operation.
In heating forging stock operation, using annular-heating stove heat, rotary heating furnace is followed successively by heat from charging end to discharge end
Exhausting section, preheating section, bringing-up section, soaking zone；Wherein, heat-recovery section temperature (i.e. forging stock material charging temperature) is less than 800 DEG C, preheating
Section temperature control at 1000~1030 DEG C, bringing-up section temperature≤1250 DEG C, soaking zone temperature control is at 1230 DEG C~1260 DEG C.One
As, heat-recovery section is set at annular furnace charging aperture, heat-recovery section is using preheating section, bringing-up section, the soaking for setting behind
The heat energy that the waste heat flue gas and high temperature section that the heat supply burner combustion of section is produced are brought is carried out to the pipe by heat-recovery section
Preheating.
It is furthermore preferred that heating forging stock operation uses annular-heating stove heat, rotary heating furnace from charging end to discharge end according to
Secondary is heat-recovery section, preheating section, bringing-up section, soaking zone；Bringing-up section is divided into 1 section of heating, 2 sections of heating, wherein, forging stock material is returned in heat
Section, preheating section, 1 section of 5~7 hours heat time of (i.e. low-temperature zone) of heating are received, in 2 sections of heating, soaking zone (i.e. high temperature section)
Heat time is less than 1.5~2 hours, so that overall heating-up temperature is uniform, forging stock intensity is suitable for the solid of perforation formation
Blank.
Further, perforation is using two roller oblique milling bevel-type punches, cartridge type punch or cone mill.
Preferably, to blank endoporus nitrogen blowing and sandblasting before being rolled after perforation, to eliminate inner surface oxide skin and prevent
Oxidation.
Specifically, the specification of the high chromium content ferrite stainless steel seamless steel pipe blank is 225 × 16.2mm of Ф, its technique stream
Journey includes：Strip off the skin round billet → heating forging stock → perforation, wherein：
In perforation process, eleven punch 11 is entered using two-high cone shape piercing machine, penetrating parameter is：8.5 ° of feed angle, roll off angle
14 °, roll spacing 179.55mm, lead 202mm push up the amount of stretching 150mm, godet speed 1.5m/s, and mill speed 0.4~1.0 is (preferably
0.55m/s)m/s。
Heating forging stock operation in, using rotary heating furnace mode of heating, rotary heating furnace from charging end to discharge end successively
It is heat-recovery section, preheating section, bringing-up section, soaking zone；Wherein, forging stock material charging temperature (i.e. heat-recovery section) is less than 800 DEG C；Preheating
Section temperature control is 1230 DEG C~1260 DEG C in 1000~1030 DEG C, bringing-up section temperature≤1250 DEG C, soaking zone temperature control, is protected
Card 2Cr25N blank heatings are uniform.
Beneficial effects of the present invention：
The present invention by suitable tool and mould and parameters adjusting, the technological innovation in production procedure, using " forging stock that strips off the skin →
The mode of annular stove heat → punch perforation " carries out the preparation of its blank pipe, reaches raising lumber recovery, reduces blank cost
Purpose.
Specific embodiment
The present invention provides a kind of production method of high chromium content ferrite stainless steel seamless steel pipe blank, and its technological process includes：
Strip off the skin round billet → heating forging stock → perforation, wherein：
Enter eleven punch 11 to round billet using punching machine and form hollow billet blank；In perforation process, overall diameter reduction ratio be 8~
12%, top front reduction ratio≤4%, ovality is 1.06~1.14；Wherein, blank is most in overall diameter reduction ratio=deformation process
Minor diameter/original blank diameter × 100%；Top front reduction ratio=blank just contacts blank diameter/original blank during top
Diameter × 100%；Ovality=lead/roll spacing；The high chromium content ferrite stainless steel is 2Cr25N steel.
The round billet that strips off the skin refer to outer surface is machined out or the treatment such as reconditioning circular blank.
Perforation principle is the rarefaction for being split using pipe center metal and not broken, top is placed in into puffs and is worn
Hole, so as to obtain the optimal resultant effect of the mechanics of perforation procedure, kinematics and quality of hollow billet.The adjustment of piercing process parameter will
The characteristics of from austenitic stainless steel, reach two purposes：One is to create good deformation condition, it is ensured that perforation procedure it is suitable
Profit is carried out, and two is to prevent surfaces externally and internally defect.
Top front reduction ratio：When i.e. blank just contacts top, blank diameter and original blank diameter ratio.People's custom is used
Top front reduction ratio come represent pipe formed vestibule degree of danger, and with this parameter as determination punch hole type design and top
One of important evidence of position adjustment；Top front reduction ratio is too small, then cannot realize that the secondary of perforation is nipped；It is excessive, then easily formed
Vestibule, causes infolding；The strength degree of steel is different with plasticity, and its critical compresibility is also different, at the same it is produced influence because
Element is including macrostructure, mirco structure and heating quality etc.；But because blank is smaller, and high temperature hot deformation resistance is big, pipe
During deformation, acutely, top front reduction ratio is difficult to set excessive for center rubbing.
Ovality：Ovality is the ratio of guidance disc distance and roll distance, and ovality influences quality of hollow billet, is nipped
Condition, axial slip, punching rate, expanding amount, rolls card and hollow billet size Control etc.；More bright particularly is influenceed on quality of hollow billet
During aobvious, ovality is bigger, increases metal transversely deforming, and axial deformation reduces, and metal transversely deforming increase can cause pipe
The tension increase of heart district, promotes the formation of pipe center bore；Too small ovality can cause the pipe blank rotary that roll is formed
It is short of power during offsetting its frictional force with top resistance with what is advanced, then can causes stall, roll card；It can be seen that, ovality sets
Put various situations such as the quality, drag, unit capacity and the production specification that should be taken into account blank.Stainless steel spreads bigger than carbon steel,
Therefore ovality selection is more slightly larger than carbon steel (generally 1.08).
Roll rotational speed：The speed of rolls of control punch machine is critically important to suppressing hollow billet heat, and punching rate is faster, hair
The temperature of pipe, especially internal surface temperature are higher, cause the increase of defect in inner surface and the abrasion of rolling tool；Stainless steel tube is
Perforation general speed is unsuitable too fast.
Further, rotary heating furnace, roller hearth type heating furnace or sensing heating are used in the heating forging stock operation.
In heating forging stock operation, using annular-heating stove heat, rotary heating furnace is followed successively by heat from charging end to discharge end
Exhausting section, preheating section, bringing-up section, soaking zone；Wherein, heat-recovery section temperature (i.e. forging stock material charging temperature) is less than 800 DEG C, preheating
Section temperature control at 1000~1030 DEG C, bringing-up section temperature≤1250 DEG C, soaking zone temperature control is at 1230 DEG C~1260 DEG C.One
As, heat-recovery section is set at annular furnace charging aperture, heat-recovery section is using preheating section, bringing-up section, the soaking for setting behind
The heat energy that the waste heat flue gas and high temperature section that the heat supply burner combustion of section is produced are brought is carried out to the pipe by heat-recovery section
Preheating.
It is furthermore preferred that heating forging stock operation uses annular-heating stove heat, rotary heating furnace from charging end to discharge end according to
Secondary is heat-recovery section, preheating section, bringing-up section, soaking zone；Bringing-up section is divided into 1 section of heating, 2 sections of heating, wherein, forging stock material is returned in heat
Section, preheating section, 1 section of 5~7 hours heat time of (i.e. low-temperature zone) of heating are received, in 2 sections of heating, soaking zone (i.e. high temperature section)
Heat time is less than 1.5~2 hours, so that overall heating-up temperature is uniform, forging stock intensity is suitable for the solid of perforation formation
Blank.In the present invention, because pyroconductivity of the stainless steel in low temperature is only the 1/3~1/2 of ordinary carbon steel, routine is significantly less than
The pyroconductivity of carbon steel, if heating is too fast, is easily caused blank bulk temperature inequality, is even ftractureed when serious；At 1000 DEG C or so
High temperature when, the two pyroconductivity is roughly the same, and during high temperature of the Cr stainless steels high more than 1100 DEG C, is also easy to produce Cr segregations,
Influence high temperature plastic, thus it is unsuitable long in the high temperature section time.
Specific embodiment of the invention is further described with reference to embodiment, is not therefore limited the present invention
System is among described scope of embodiments.
Using 4 Φ 200mm, 2Cr25N forging stocks, in the case where heating-up temperature is 1230 DEG C~1260 DEG C controls, climbing
The unit of Chengdu Gang Fan Co., Ltds of steel group 159, carries out production 89 × 5mm specification seamless steel pipes by the following method；Its blank
Specific production technology it is as follows：
Heating requirements：Rotary heating furnace mode of heating is used in heating forging stock operation, rotary heating furnace is from charging end to going out
Material end is followed successively by heat-recovery section, preheating section, bringing-up section, soaking zone；Wherein, forging stock material charging temperature (i.e. heat-recovery section) is less than
800℃；Preheating section temperature control is 1230 DEG C in 1000~1030 DEG C, bringing-up section temperature≤1250 DEG C, soaking zone temperature control
~1260 DEG C, it is ensured that the uniform each section of temperature of 2Cr25N blank heatings presses the control of 2Cr25N temperature requirements.After steel pipe goes out annular furnace,
Enter eleven punch 11 in two-high cone shape piercing machine, penetrating parameter is as shown in table 1：
Table 1
By following formula measuring and calculating overall diameter reduction ratio, top front reduction ratio and ovality under the technological parameter：
The minimum diameter of blank/original blank diameter × 100% in overall diameter reduction ratio=deformation process；
Top front reduction ratio=blank just contacts blank diameter/original blank diameter × 100% during top；
Ovality=lead/roll spacing；It is 10% to calculate overall diameter reduction ratio, and top front reduction ratio is 1.7%, and ovality is
1.122, gained hollow billet specification is 225 × 16.2mm, and length is 2~8m.It is single steel pipe (i.e. hollow billet) to be produced using the inventive method
Zhi Changdu is 2~8m, and main lumber recovery loss is scaling loss, and lumber recovery is up to more than 98%.
Claims (5)
1. the production method of high chromium content ferrite stainless steel seamless steel pipe blank, it is characterised in that its technological process includes：Strip off the skin circle
Base → heating forging stock → perforation, wherein：
Enter eleven punch 11 to round billet using punching machine and form hollow billet blank；In perforation process, overall diameter reduction ratio is 8~12%,
Top front reduction ratio is≤4%, and ovality is 1.06~1.14；The high chromium content ferrite stainless steel is 2Cr25N steel；
In heating forging stock operation, using annular-heating stove heat, rotary heating furnace is followed successively by recuperation of heat from charging end to discharge end
Section, preheating section, bringing-up section, soaking zone；Wherein, heat-recovery section temperature is less than 800 DEG C, and preheating section temperature control is 1000~1030
DEG C, bringing-up section temperature≤1250 DEG C, soaking zone temperature control is at 1230 DEG C~1260 DEG C；Bringing-up section is divided into 1 section of heating, heating 2
Section, forging stock material in heat-recovery section, preheating section, 1 section of 5~7 hours heat times of heating, when 2 sections, the heating of soaking zone are heated
Between be less than 1.5 hours.
2. the production method of high chromium content ferrite stainless steel seamless steel pipe blank according to claim 1, it is characterised in that wear
Hole uses two roller oblique milling bevel-type punches, cartridge type punch or cone mill.
3. the production method of high chromium content ferrite stainless steel seamless steel pipe blank according to claim 1 and 2, its feature exists
In to blank endoporus nitrogen blowing and sandblasting before being rolled after perforation, to eliminate inner surface oxide skin and anti-oxidation.
4. the production method of high chromium content ferrite stainless steel seamless steel pipe blank according to claim 2, it is characterised in that institute
The specification of high chromium content ferrite stainless steel seamless steel pipe blank is stated for 225 × 16.2mm of Ф, in its technological process：
In perforation process, eleven punch 11 is entered using two roller oblique milling bevel-type punches, penetrating parameter is：8.5 ° of feed angle, roll off angle
14 °, roll spacing 179.55mm, lead 202mm push up the amount of stretching 150mm, godet speed 1.5m/s, 0.4~1.0m/s of mill speed.
5. the production method of high chromium content ferrite stainless steel seamless steel pipe blank according to claim 3, it is characterised in that institute
The specification of high chromium content ferrite stainless steel seamless steel pipe blank is stated for 225 × 16.2mm of Ф, in its technological process：
In perforation process, eleven punch 11 is entered using two roller oblique milling bevel-type punches, penetrating parameter is：8.5 ° of feed angle, roll off angle
14 °, roll spacing 179.55mm, lead 202mm push up the amount of stretching 150mm, godet speed 1.5m/s, 0.4~1.0m/s of mill speed.
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| CN106238465B (en) * | 2016-08-11 | 2019-02-05 | 攀钢集团成都钢钒有限公司 | A kind of preparation method of PH stainless steel seamless steel pipe |
| CN107774715B (en) * | 2016-08-30 | 2019-11-05 | 林州凤宝管业有限公司 | The double ruler production technology of 220 pipe of vehicle bridge pipe Φ |
| CN112570487A (en) * | 2020-11-24 | 2021-03-30 | 江苏联峰能源装备有限公司 | Molding process for producing X80 pipeline steel seamless steel tube by adopting phi 800 mm large round billet |
| CN112894276B (en) * | 2021-01-18 | 2022-04-08 | 中国兵器工业第五九研究所 | Deep blind hole cylindrical component and manufacturing method thereof |
| CN113441551B (en) * | 2021-06-30 | 2022-07-01 | 北京科技大学 | Thick-walled seamless steel pipe and preparation method thereof |
| CN113600637B (en) * | 2021-06-30 | 2022-04-15 | 北京科技大学 | Seamless steel pipe and preparation method thereof |
| CN113976628B (en) * | 2021-11-08 | 2024-05-28 | 中冶东方工程技术有限公司 | Production process and device of stainless steel seamless steel tube |
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| JPH0925541A (en) * | 1995-07-12 | 1997-01-28 | Sumitomo Metal Ind Ltd | Non-heat-treated hollow rolled bar steel having high strength and high toughness and its production |
| CN101020192A (en) * | 2007-03-21 | 2007-08-22 | 中冶东方工程技术有限公司 | Hot rolling process of seamless steel pipe |
| CN101337236A (en) * | 2007-07-06 | 2009-01-07 | 中冶东方工程技术有限公司 | Rolling mill technique of three-roller full-floating core rod tandem rolling tube |
| CN101327492A (en) * | 2008-07-30 | 2008-12-24 | 郝建庚 | Process and system for manufacturing hot-rolled seamless tube |
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