CN106086372B - The heating means of seamless steel pipe - Google Patents
The heating means of seamless steel pipe Download PDFInfo
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- CN106086372B CN106086372B CN201610631342.2A CN201610631342A CN106086372B CN 106086372 B CN106086372 B CN 106086372B CN 201610631342 A CN201610631342 A CN 201610631342A CN 106086372 B CN106086372 B CN 106086372B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a kind of heating means of seamless steel pipe, temperature schedule, heating time, pressure regime, atmosphere system including rotary heating furnace.The present invention can form uniform austenite structure, reduce oxidization burning loss, all eliminate yield strength, the relatively low defect of impact strength performance indicator.
Description
Technical field
The present invention relates to a kind of metal-pressed machine technologies, specifically, are related to a kind of heating means of seamless steel pipe.
Background technology
Blank needs to be heated to suitable rolling temperature in rotary heating furnace before the rolling, is then rolled into pipe.Structure
The technology requirement of pipe is high-yield strength, high impact toughness, in blank chemical composition uniformity, carbide homogeneity has sternly
Lattice requirement.Structural tube structural state under room temperature is ferrite+cementite, and the heating process of blank is actually carbide diffusion
With dissolving and the process of austenite homogenization.Blank heating method has vital effect to improving properties of product.If
Heating process is unreasonable, it is impossible to form uniform austenite, will cause the performance indicators such as yield strength, impact flexibility that cannot meet
Standard requirement.
During blank heating, raise and undergo phase transition with temperature.After steel temperature is more than phase critical point, blank interior tissue will
Two-phase structure's state under from room temperature is changed into homogeneous structure austenite.The plasticity of steel is preferable at this time, and resistance of deformation greatly drops
It is low, it is easy to carry out pressure processing.It is thus determined that rational blank heating temperature scope, is conducive to improve the plasticity of steel, reduces and become
Shape drag.
Using thick in the blank rolling 322mm series, 403mm series, 482mm series of 350mm, 390mm, 430mm diameter
Wall steel pipe, roll-force is relatively small during rolling, and blank is susceptible to the characteristics of distribution of carbides is uneven, the yield strength of steel pipe, punching
It is relatively low to hit toughness index.This just needs to use rational technique during cold, cooling control after rolling is controlled in blank heating, rolling, rolling,
Cannot occur blank overheat and burning simultaneously.Therefore rational heating means how are formulated, is uniformly distributed austenite, should avoid
The overheat of steel, burning.Cross that grain growth inside hot blank is excessive, grain structure combination power reduces, the surrender for causing steel pipe is strong
The performance indicators such as degree, impact flexibility degenerate.
The content of the invention
Technical problem solved by the invention is to provide a kind of heating means of seamless steel pipe, can eliminate blank carbide
The problem of uneven, crystal grain thinning degree prevent crystal grain from growing up.
Technical solution is as follows：
A kind of heating means of seamless steel pipe, temperature schedule, heating time including rotary heating furnace, pressure regime, gas
Atmosphere system；
In temperature schedule, extend preheating section, preheating section requirement Close All burner reduces low-temperature heat area temperature in heating zone
Degree, low-temperature heat area temperature are 800 DEG C -1100 DEG C, and slow heating, firing rate is 50-160 DEG C/h, heating time 1-
3 it is small when；Strengthen the temperature in the high-temperature heating area in heating zone, quick heating, firing rate after blank temperature is more than 600 DEG C
Scope is 250-270 DEG C/h, until surface temperature quickly rises to required temperature of coming out of the stove；Soaking zone carries out soaking, adds
Thermal velocity is 5-60 DEG C/h, and when soaking time 0.8-4 is small, the surface temperature of steel no longer raises at this time, makes central temperature gradual
Rise, the temperature difference on shrink sector；Control come out of the stove blank perforation after temperature, after perforation temperature be 1160-1250 DEG C；
By controlling the tapping interval 50~200 seconds of heating furnace, come heating time when ensureing that 3-11 is small；
In pressure regime, control the furnace gas pressure near furnace bottom, take micro-pressure operation, furnace pressure control for 0.5~
15Pa；
In atmosphere system, preheating section and bringing-up section atmosphere are weak oxide atmosphere, and weak oxide atmosphere makes to be harmful to gas in steel
Body is excluded by means of High temperature diffusion effect；It is mingled with or banded structure acts on being dissolved by High temperature diffusion or dispersion, with
Profit is uniformly precipitated after rolling；
Soaking zone is weakly reducing atmosphere, and to reduce the oxidization burning loss of blank, atmosphere system is the air-fuel by adjusting fuel
Than being realized with coefficient of excess air.
Further：Rotary heating furnace includes preheating zone and an area to 6th area, and the blank of diameter 350mm is by preheating zone and one
Preheating section, preheating zone temperature≤700 DEG C are worked as into the preheating zone of stove as preheating section, diameter 390mm and 430mm blank in area；Directly
Footpath 350mm blanks Jiang Erqu, 3rd area are set to low-temperature heat area, and two area's temperature are≤950 DEG C, and three area's temperature are≤1100 DEG C；Directly
As low-temperature heat area, area's temperature is≤950 DEG C, is controlled 2nd area for footpath 390mm and diameter 430mm blanks Jiang Yiqu, 2nd area
Temperature is≤1100 DEG C；3rd area and 4th area are high-temperature heating area, controls three area's temperature between 1050-1250 DEG C, to strengthen and heating
When 0.4-3 is small, between four area's temperature are 1200-1290 DEG C, strengthen heating time 0.4-2 it is small when, the blank of diameter 350mm is by four
Area is high-temperature heating area, and between heating temperature is 1200-1270 DEG C, the blank Jiang Sanqu of diameter 390mm and 430mm and 4th area make
To be heated at high temperature area, between three area's temperature are 1180-1250 DEG C, between four area's temperature are 1200-1290 DEG C；Control five area's temperature
For 1260-1300 DEG C, when soaking heat preservation 0.4-2 is small, control six area's temperature that soaking temperature is reduced 5-10 for 1250-1290 DEG C
When soaking time after DEG C is 0.4-2 small.
Further：The Plane Angle of preheating zone is 87 °, and the angle in an area is 41 °, and the angle in 2nd area is 43 °, the angle in 3rd area
It spends for 47 °, the angle in 4th area is 47 °, and the angle in 5th area is 40 °, and the angle in 6th area is 45 °, charging and the angle angle of discharge zone
It spends for 10 °.
Compared with prior art, the technology of the present invention effect includes：
1st, the present invention can eliminate the problem of blank carbide is uneven, refined grain size, crystal grain is prevented to grow up.It eliminates
The problem of 16Mn seamless steel pipe performance indicators are relatively low, the austenite structure stablized, yield strength, impact strength performance
The relatively low defect of index all eliminates, and properties percent of pass reaches 100%.
2nd, the present invention has taken into account two aspect of yield and quality, and the present invention also increases preheating section, and exhaust gas temperature of coming out of the stove is relatively low,
The utilization of thermal energy is preferable, and unit of fuel consumption reduces.Bringing-up section can strengthen heat supply, and quick heating reduces oxidation and decarburization,
And ensure that stove has higher productivity.
3rd, soaking zone can reduce the oxidization burning loss of blank for weakly reducing atmosphere, and burn out rate is less than 2.2%.
4th, remarkable in economical benefits enhances.
Year economic benefit：Energy-saving 1111.08 ten thousand yuan altogether.Month economic benefit：980,000 yuan of co-falling cost.
(1) moon saves heat treatment expense=ten thousand yuan of 1400*500=70.Properties percent of pass improves 1400/40000*
100%=3.5%, 40000 tons of monthly output, performance substandard product heat treatment expense is 500 yuan/ton.
(2) natural gas unit consumption is reduced：3.53m3/ ton.Reduce gas cost：40000 (monthly output) * 4.53 (moon unit consumption
Decreasing value) * 1.6 (natural gas unit price members/m3Yuan/month of)=290,000.
Description of the drawings
Fig. 1 is the subregion schematic diagram of rotary heating furnace in the present invention；
Fig. 2 is the blank metallograph that the technology of the present invention is not used in the present invention；
Fig. 3 is using the blank metallograph after the technology of the present invention in the present invention.
Specific embodiment
In order to which those skilled in the art is made to more fully understand technical scheme, it is preferably implemented with reference to the present invention
Example, carries out technical scheme clear, complete description, based on the embodiment in the application, ordinary skill
Other similar embodiments that personnel are obtained on the premise of creative work is not made should all belong to the application protection
Scope.
In the present invention, the rotary heating furnace for heating seamless steel pipe amounts to You Qige areas, using (preheating section, bringing-up section, soaking
Section) Three-section type heating, the optimal heating temperature of each section of use of rotary heating furnace, heating time, firing rate, pressure regime, gas
Atmosphere system.
As shown in Figure 1, it is the subregion schematic diagram of rotary heating furnace in the present invention.
The rotary heating furnace of heating seamless steel pipe amounts to You Qige areas, including preheating zone and an area to 6th area, wherein in advance
The Plane Angle of hot-zone is 87 °, and the angle in an area is 41 °, and the angle in 2nd area is 43 °, and the angle in 3rd area is 47 °, the angle in 4th area
It spends for 47 °, the angle in 5th area is 40 °, and the angle in 6th area is 45 °, and the angle angle of charging and discharge zone is 10 °.Three-stage adds
Thermal system had both considered the danger of heating initial stage temperature stress, it is contemplated that mid-term quickly heats and the uniformity of end temperature,
Two aspect of yield and quality is taken into account.For rotary heating furnace due to there is preheating section, exhaust gas temperature of coming out of the stove is relatively low, the utilization of thermal energy compared with
Good, unit of fuel consumption is low.Bringing-up section can strengthen heat supply, and quick heating reduces oxidation and decarburization, and ensure stove have compared with
High productivity.
1st, temperature schedule.
(1) preheating section is extended, preheating section requirement Close All burner, exhaust gas temperature can be reduced by closing burner, beneficial to section
Energy.
The blank of diameter 350mm is using preheating zone and an area as preheating section, and diameter 390mm and 430mm blank are by stove
Preheating zone is used when preheating section, preheating zone temperature≤700 DEG C.
(2) low-temperature heat area temperature in heating zone is reduced, low-temperature heat area temperature is 800 DEG C -1100 DEG C, slow heating,
Firing rate is 50-160 DEG C/h, and when heating time is 1-3 small, at this moment temperature stress is small, will not generate crack due to thermal stress.
Its plasticity is poor when most of steel grade is below 600 DEG C, therefore should take low temperature slow heat, reduces low temperature
Heating Zone Temperature, slow heating, general steel temperature should 50-200 degree lower than stove galvanic couple temperature.Therefore diameter 350mm blanks will
2nd area, 3rd area are set to low-temperature heat area, and two area's temperature are≤950 DEG C, and three area's temperature are≤1100 DEG C；Diameter 390mm and diameter
As low-temperature heat area, area's temperature is≤950 DEG C for 430mm blanks Jiang Yiqu, 2nd area, and it is≤1100 to control two area's temperature
℃。
(3) temperature in the high-temperature heating area in heating zone is strengthened.
After blank temperature is more than 600 DEG C, it into plastic range, at this moment can quickly heat, refer to table 3, heat
Velocity interval is 250-270 DEG C/h, until surface temperature quickly rises to required temperature of coming out of the stove.Diameter 390mm and
The blank of 430mm, control three area's temperature between 1050-1250 DEG C, strengthen heating 0.4-3 it is small when, four area's temperature are 1200-
Between 1290 DEG C, when reinforcing heating time 0.4-2 is small.With the raising of heating temperature, atoms permeating rate is drastically accelerated so that difficult to understand
Family name's body speed greatly increases, and shortens the time required to being formed.When heating temperature is identical, firing rate is faster, and the degree of superheat is bigger, difficult to understand
Family name's body is actually formed that temperature is higher, and the increase of nucleation rate is more than coarsening rate, makes austenite grain more tiny.Therefore using fast
Fast heating process obtains ultra fine grain.
4th area are high-temperature heating area by the blank of diameter 350mm, between heating temperature is 1200-1270 DEG C；Diameter 390mm
With the blank Jiang Sanqu of 430mm and 4th area as high-temperature heating area, between three area's temperature are 1180-1250 DEG C, four area's temperature are
Between 1200-1290 DEG C.
(4) soaking zone carries out soaking.
Soaking zone is the critical stage of homogeneity of austenite component.After cementite just all incorporates austenite, Ovshinsky
Internal concentration of carbon is still non-uniform, and only experience keeping the temperature for a long time or continuing to heat, and allows the acute sufficient diffusion of carbon atom
The uniform austenite of ingredient could be obtained.
There is larger temperature difference at the end of the heating phase, on blank section, it is necessary to carry out soaking into soaking period, therefore should
When slowly entering soaking zone, firing rate is 5-60 DEG C/h, and when soaking time 0.8-4 is small, the surface temperature of steel is no longer at this time
Rise, and central temperature is gradually increasing, the temperature difference on shrink sector.The appropriate temperature for reducing by two sections of soaking, beneficial to heating
The grain size grown up further refines.One section of soaking (5th areas) temperature is controlled as 1260-1300 DEG C, when soaking heat preservation 0.4-2 is small,
Two sections of soaking (6th areas) temperature is controlled as 1250-1290 DEG C, it is small for 0.4-2 that soaking temperature is reduced the soaking time after 5-10 DEG C
When.
(5) control come out of the stove blank perforation after temperature, after perforation temperature be 1160-1250 DEG C, which become metal
Shape drag is small, beneficial to plastic deformation.
2nd, heating time.
The heating time of blank refer to blank into after stove by preheating, heating and thermal process reaches required heating temperature
Necessary minimum time when spending.During blank heating, at high temperature in austenitization, except the iron element of body-centered cubic lattice
Body, which is changed into outside face-centered cubic lattice, is accompanied by the destruction of cementite dot matrix, and is dissolved in austenite, along with carbon atom
Diffusion in austenite makes the ingredient of austenite further be homogenized with tissue.Heating temperature and soaking time are longer, Ovshinsky
Body ingredient is more uniform, and crystal grain is coarseer, increases the stability of austenite.The preform heating time of science can improve the sense of organization of steel
Can, make its microstructure homogenization.The heating time of blank depends on steel grade, cross dimensions, the type of furnace, furnace temperature and distribution, blank in stove
Interior display case, steel surface degree, the thermal conductivity of steel and its firing rate etc..By the tapping interval 50 for controlling heating furnace
~200 seconds, come heating time when ensureing that 3-11 is small.
3rd, pressure regime.
Furnace pressure refers to the pressure differential between heat smoke and outside air in the rotary heating furnace of unit volume.Control stove
Gun pressure power refers to the furnace gas pressure near control furnace bottom, should take micro-pressure operation, and furnace pressure control is 0.5~15Pa.Surely
During fixed micro-pressure operation, slightly flare, but without in cold air sucking stove, can effectively subtract at fire door or other furnace bottom gaps
The upper and lower temperature difference of few burner hearth ensures that bottom temperature is stablized, is conducive to blank and is evenly heated.
4th, atmosphere system.
Preheating section and bringing-up section atmosphere are weak oxide atmosphere, and weak oxide atmosphere can make in steel pernicious gas by means of height
The diffusion of temperature is excluded；Some are mingled with or banded structure acts on being dissolved by High temperature diffusion or dispersion, are rolled with profit
It is uniformly precipitated afterwards.
Soaking zone can reduce the oxidization burning loss of blank for weakly reducing atmosphere.Atmosphere system is the air-fuel ratio by adjusting fuel
It is realized with coefficient of excess air, by the control of residual oxygen within the specific limits.
Below by taking 16Mn steel as an example, the preferred embodiment of the present invention is described further.
1st, the chemical composition of 16Mn steel is as shown in table 1.
Table 1
2nd, temperature schedule, as shown in table 2.
Table 2
3rd, heating rate and heating time, as shown in table 3.
Table 3
4th, the control of air-fuel ratio.
Air：Natural gas=9~10:1
5th, the control of coefficient of excess air, as shown in table 4.
Table 4
| Subregion | 1st area | 2nd area | 3rd area | 4th area | 5th area | 6th area |
| Coefficient of excess air value | 1.0-1.15 | 1.0-1.2 | 1.1-1.3 | 1.1-1.3 | 1.0-1.2 | 0.8-0.98 |
6th, the actual desired value of properties of product.
7th, metallograph.
As shown in Fig. 2, it is the blank metallograph that the technology of the present invention is not used in the present invention.
Before this heating means is not used, performance indicator is unqualified, and metallographic structure contains Widmannstatten structure, and microscopic structure is F (iron
Ferritic)+P (pearlite)+W (Wei Shi bodies)；Grain size is 6.5 grades.
As shown in figure 3, it is using the blank metallograph after the technology of the present invention in the present invention.
By the application of the present invention, properties of product are improved well, and performance indicator is qualified, and metallographic structure is F (iron
Ferritic)+P (pearlite)；Grain size is 7.5 grades.
Moreover, it will be appreciated that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
Using specification as an entirety, the technical solutions in each embodiment can also be properly combined, forms those skilled in the art
It is appreciated that other embodiment.
Claims (2)
1. a kind of heating means of seamless steel pipe, it is characterised in that：Temperature schedule, heating time, pressure including rotary heating furnace
Power system, atmosphere system；
In temperature schedule, extending preheating section, preheating section requirement Close All burner reduces low-temperature heat area temperature in heating zone,
Low-temperature heat area temperature is 800 DEG C -1100 DEG C, slow heating, and firing rate is 50-160 DEG C/h, and heating time is small for 1-3
When；Strengthen the temperature in the high-temperature heating area in heating zone, quick heating, firing rate model after blank temperature is more than 600 DEG C
It encloses for 250-270 DEG C/h, until surface temperature quickly rises to required temperature of coming out of the stove；Soaking zone carries out soaking, heating
Speed be 5-60 DEG C/h, when soaking time 0.8-4 is small, the surface temperature of steel no longer raises at this time, make central temperature it is gradual on
It rises, the temperature difference on shrink sector；Control come out of the stove blank perforation after temperature, after perforation temperature be 1160-1250 DEG C；
By controlling the tapping interval 50 ~ 200 seconds of heating furnace, come heating time when ensureing that 3-11 is small；
In pressure regime, the furnace gas pressure near furnace bottom is controlled, takes micro-pressure operation, furnace pressure control is 0.5~15Pa；
In atmosphere system, preheating section and bringing-up section atmosphere are weak oxide atmosphere, and weak oxide atmosphere borrows pernicious gas in steel
Help High temperature diffusion effect to be excluded；It is mingled with or banded structure acts on being dissolved by High temperature diffusion or dispersion, is rolled with profit
It is uniformly precipitated afterwards；
Soaking zone is weakly reducing atmosphere, to reduce the oxidization burning loss of blank, atmosphere system be by adjusting fuel air-fuel ratio and
Coefficient of excess air is realized.
2. the heating means of seamless steel pipe as described in claim 1, it is characterised in that：Rotary heating furnace includes preheating zone and one
Area to 6th area, the Plane Angle of preheating zone is 87 °, and the angle in an area is 41 °, and the angle in 2nd area is 43 °, and the angle in 3rd area is
47 °, the angle in 4th area is 47 °, and the angle in 5th area is 40 °, and the angle in 6th area is 45 °, and feed is with the angle angle of discharge zone
10°。
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| CN112097514B (en) * | 2020-09-29 | 2022-03-18 | 江苏天淮钢管有限公司 | Ultralow-emission annular furnace |
| 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 |
| CN114273431B (en) * | 2021-11-13 | 2023-03-24 | 中南大学 | Method for reducing heating schedule of micro-alloy steel thermal cracks |
| CN116676470B (en) * | 2023-08-03 | 2023-12-01 | 成都先进金属材料产业技术研究院股份有限公司 | Heat-resistant steel seamless steel pipe and heat treatment method thereof |
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| CN105420486A (en) * | 2015-11-03 | 2016-03-23 | 邯钢集团邯宝钢铁有限公司 | Heating control method of steel rolling heating furnace applicable to pipeline steel |
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2016
- 2016-08-02 CN CN201610631342.2A patent/CN106086372B/en not_active Withdrawn - After Issue
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| CN101195853A (en) * | 2007-12-19 | 2008-06-11 | 莱芜钢铁集团有限公司 | Heating method for preventing high carbon belt steel bloom decarburization |
| KR20100001842A (en) * | 2008-06-27 | 2010-01-06 | 주식회사 포스코 | Heating method of slab for reducing red scales of hot-rolled steel sheets |
| CN101775475A (en) * | 2010-02-03 | 2010-07-14 | 无锡西姆莱斯石油专用管制造有限公司 | Hot-rolled tube billet heating process |
| CN104438334A (en) * | 2014-09-19 | 2015-03-25 | 衡阳华菱钢管有限公司 | Medium-caliber 9Ni low-temperature seamless steel tube and production method |
| CN104313298A (en) * | 2014-09-30 | 2015-01-28 | 山东钢铁股份有限公司 | Cold-charge heating method of bearing steel continuous casting billet |
| CN105420486A (en) * | 2015-11-03 | 2016-03-23 | 邯钢集团邯宝钢铁有限公司 | Heating control method of steel rolling heating furnace applicable to pipeline steel |
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