CN104263901A - Cold-rolled strip steel continuous annealing production system and method for refrigerated welded pipes as well as strip steel and welded pipes - Google Patents
Cold-rolled strip steel continuous annealing production system and method for refrigerated welded pipes as well as strip steel and welded pipes Download PDFInfo
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- CN104263901A CN104263901A CN201410482246.7A CN201410482246A CN104263901A CN 104263901 A CN104263901 A CN 104263901A CN 201410482246 A CN201410482246 A CN 201410482246A CN 104263901 A CN104263901 A CN 104263901A
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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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- 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
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a cold-rolled strip steel continuous annealing production system and method for refrigerated welded pipes as well as strip steel and welded pipes, belonging to the technical field of engineering materials. According to the system and the method, the annealing refers to continuous annealing, the temperature of the heating section is 760+/-10 DEG C, the annealing temperature is 760+/-10 DEG C, the temperature of a slow cooling outlet is 640+/-10 DEG C, the temperature of a rapid cooling outlet is 410+/-10 DEG C, the overaging temperature is 375+/-10 DEG C, the temperature of a finish cooling outlet is 175+/-10 DEG C, and the cold rolled reduction ratio is 72-82 percent. The strip steel is produced by the system and the method, and comprises the following components in percentage by mass: 0.035-0.045 percent of C, 0.6-0.8 percent of Mn, less than or equal to 0.03 percent of Si, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.04 percent of Als, 0.0030-0.0050 percent of N and the balance of Fe. The refrigerated welded pipes are prepared by the strip steel. The strip steel and the welded pipes produced by the system and the method have low temperature brittleness resistance.
Description
Technical field
The present invention relates to engineering materials technical field, particularly one refrigeration welded tube cold rolled strip steel production system and method, this band steel and welded tube.
Background technology
In prior art, refrigeration welded tube cold rolled strip annealing process is in process of production generally adopt bell-type annealing.And the existing research to refrigeration welded tube cold rolled strip is normally hit in the control of its chemical composition, under the prerequisite meeting the requirement of cold-reduced sheet annealing punching performance, by the strict control to its chemical composition, reduce the low temperature brittleness of band steel.Almost do not study is that annealing process for this refrigeration welded tube cold rolled strip carries out.
Summary of the invention
For solving the problem, the present invention proposes a kind of refrigeration welded tube cold rolled strip steel production system and method adopting continuous annealing process in process of production, apply refrigeration welded tube cold rolled strip that this production system and production method produce and apply the refrigeration welded tube that this cold rolled strip makes.
The production system of refrigeration welded tube cold rolled strip provided by the invention comprises Hot Rolling Mill, cold mill complex, annealing furnace and levelling machine, refrigeration welded tube strand obtains refrigeration welded tube cold rolled strip successively after described Hot Rolling Mill, cold mill complex, annealing furnace and levelling machine, and described annealing furnace is continuous annealing furnace;
The scope of the cold rolling draft of described cold mill complex is 72 ~ 82%;
Described continuous annealing furnace heating zone temperature is 760 ± 10 DEG C, and annealing temperature is 760 ± 10 DEG C, and slow cooling temperature out is 640 ± 10 DEG C, and rapid cooling temperature out is 410 ± 10 DEG C, and overaging temperature is 375 ± 10 DEG C, and cold temperature out is 175 ± 10 DEG C eventually.
As preferably, the smooth unit elongation of described levelling machine is 0.74% ~ 0.80%.
As preferably, the Heating temperature of described Hot Rolling Mill is 1250 ± 20 DEG C; Finishing temperature is 930 ± 20 DEG C; Coiling temperature is 730 ± 20 DEG C.
The production method of refrigeration welded tube cold rolled strip provided by the invention comprises hot rolling, cold rolling, annealing and smooth step successively, and the step of described annealing is continuous annealing;
In described cold rolling step, the scope of cold rolling draft is 72 ~ 82%;
In described continuous annealing step, heating zone temperature is 760 ± 10 DEG C, and annealing temperature is 760 ± 10 DEG C, and slow cooling temperature out is 640 ± 10 DEG C, and rapid cooling temperature out is 410 ± 10 DEG C, and overaging temperature is 375 ± 10 DEG C, and cold temperature out is 175 ± 10 DEG C eventually.
As preferably, the smooth unit elongation of described planarization step is 0.74% ~ 0.80%.
As preferably, the Heating temperature of described hot-rolled step is 1250 ± 20 DEG C; Finishing temperature is 930 ± 20 DEG C; Coiling temperature is 730 ± 20 DEG C.
Refrigeration welded tube cold rolled strip provided by the invention is produced by production system provided by the invention or production method provided by the invention, and each constituent mass percentage ratio is respectively: C, 0.035-0.045%; Mn, 0.6 ~ 0.8%; Si ,≤0.03%; P ,≤0.015%; S ,≤0.015%; Als ,≤0.04%, N, 0.0030 ~ 0.0050, surplus is Fe.
Refrigeration welded tube provided by the invention, is formed by cold rolled strip manufacture provided by the invention.
The scope that the invention provides the cold rolling draft of the production system cold mill complex of refrigeration welded tube cold rolled strip is 72 ~ 82%, the annealing temperature of continuous annealing furnace is 760 ± 10 DEG C, cold rolling draft and annealing temperature are all higher, are conducive to { the formation of 111} texture in the recrystallize after cold roller and deformed and annealing process.{ 111} texture directly affects the deep drawability of cold rolled strip, this deep drawability is weighed by its Lankford r value, and the height of this Lankford r value depends on the texture of cold rolled strip, { 111} texture is stronger, { 100} texture is more weak, then this Lankford r value is higher, and now, the deep drawability of cold rolled strip is better.In continuous annealing furnace, heating zone temperature is 760 ± 10 DEG C, annealing temperature is 760 ± 10 DEG C, slow cooling temperature out is 640 ± 10 DEG C, namely continuous annealing furnace adopts balance annealing soak temperature, and excessive grain can be avoided thick, keeps a certain amount of Carbide Precipitation to strengthen crystal boundary, reduce continuous annealing furnace rapid cooling section temperature out to 410 ± 10 DEG C simultaneously, can ensure in process of cooling, increase the bonding force of tiny second-phase at crystal boundary, anti-secondary processing brittleness ability improves.To sum up, not only deep drawability is good for the refrigeration welded tube cold rolled strip that the production system that the invention provides refrigeration welded tube cold rolled strip produces, and anti-secondary processing brittleness ability improves, when it is applied in low temperature environment, it is a kind of anti-low temperature brittleness refrigeration welded tube cold rolled strip.
The beneficial effect that the invention provides the production method of refrigeration welded tube cold rolled strip is similar with the beneficial effect that the invention provides the production system refrigerating welded tube cold rolled strip, repeats no more herein.
The invention provides refrigeration welded tube cold rolled strip adopts production system provided by the invention or production method to produce, beneficial effect in production technique with the invention provides that to refrigerate welded tube cold rolled strip be adopt the beneficial effect of production system provided by the invention or production method similar, repeat no more herein.In addition, in the moiety of band steel, C element adds mainly as strengthening element, the corresponding intensity of this cold rolled strip of principal security and hardness, the formation of acicular ferrite can be impelled, and reduce grain boundary ferrite, the acquisition of optimum tenacity be C 0.03% ~ 0.07%, along with the ratio of the increase acicular ferrite of C content increases.Within the specific limits, increase C content to toughness and intensity all useful.But carbon content more than 0.10% after, low-temperature impact toughness declines rapidly.Therefore, in order to ensure that welded tube has good low-temperature flexibility, must the strict carbon content controlled in cold rolled strip.Mn is one of main alloy element of proof strength, and this element can reduce the transition temperature of C → A effectively, suppresses the formation of crystal boundary proeutectoid ferrite, impels in weld seam and form acicular ferrite structure.Can effectively suppress crystal boundary proeutectoid ferrite and ferrite side plate in 0.6% ~ 1.6% scope, the ratio of acicular ferrite is improved, obtain very high toughness.Along with the increase of w (Mn)/w (C), toughness decreases, therefore, the reasonable disposition of C and Mn must be considered in alloy system, the content of C is 0.035-0.045%, when Mn content is 0.6-0.8%, can ensure at low ambient temperatures, the invention provides refrigeration welded tube cold rolled strip and there is higher toughness.S, P, as impurity element, can make welded tube plasticity and toughness and anti-fragility reduce, therefore will strictly control its content in weld seam, therefore, need to control at S≤0.015%, P≤0.015%.
Refrigeration welded tube provided by the invention is formed by refrigeration welded tube cold rolled strip provided by the invention manufacture, and because this cold rolled strip has the performance of anti-low temperature brittleness, therefore, this refrigeration welded tube also has the performance of anti-low temperature brittleness.
Accompanying drawing explanation
The metallographic structure photo of the refrigeration welded tube cold rolled strip that Fig. 1 provides for the embodiment of the present invention.
Embodiment
In order to understand the present invention in depth, below in conjunction with drawings and the specific embodiments, the present invention is described in detail.
The production system of refrigeration welded tube cold rolled strip provided by the invention comprises Hot Rolling Mill, cold mill complex, annealing furnace and levelling machine, refrigeration welded tube strand obtains refrigeration welded tube cold rolled strip successively after Hot Rolling Mill, cold mill complex, annealing furnace and levelling machine, and annealing furnace is continuous annealing furnace; The scope of the cold rolling draft of cold mill complex is 72 ~ 82%; Continuous annealing furnace heating zone temperature is 760 ± 10 DEG C, and annealing temperature is 760 ± 10 DEG C, and slow cooling temperature out is 640 ± 10 DEG C, and rapid cooling temperature out is 410 ± 10 DEG C, and overaging temperature is 375 ± 10 DEG C, and cold temperature out is 175 ± 10 DEG C eventually.
The scope that the invention provides the cold rolling draft of the production system cold mill complex of refrigeration welded tube cold rolled strip is 72 ~ 82%, the annealing temperature of continuous annealing furnace is 760 ± 10 DEG C, cold rolling draft and annealing temperature are all higher, are conducive to { the formation of 111} texture in the recrystallize after cold roller and deformed and annealing process.{ 111} texture directly affects the deep drawability of cold rolled strip, this deep drawability is weighed by its Lankford r value, and the height of this Lankford r value depends on the texture of cold rolled strip, { 111} texture is stronger, { more weak then this Lankford r value of 100} texture is higher, now, the deep drawability of cold rolled strip is better.In continuous annealing furnace, heating zone temperature is 760 ± 10 DEG C, annealing temperature is 760 ± 10 DEG C, slow cooling temperature out is 640 ± 10 DEG C, namely continuous annealing furnace adopts balance annealing soak temperature, and excessive grain can be avoided thick, keeps a certain amount of Carbide Precipitation to strengthen crystal boundary, reduce continuous annealing furnace rapid cooling section temperature out to 410 ± 10 DEG C simultaneously, can ensure in process of cooling, increase the bonding force of tiny second-phase at crystal boundary, anti-secondary processing brittleness ability improves.To sum up, not only deep drawability is good for the refrigeration welded tube cold rolled strip that the production system that the invention provides refrigeration welded tube cold rolled strip produces, and anti-secondary processing brittleness ability improves, when it is applied in low temperature environment, it is a kind of anti-low temperature brittleness refrigeration welded tube cold rolled strip.
Wherein, the smooth unit elongation of levelling machine is 0.74% ~ 0.80%.The smooth elongation control of levelling machine is 0.74% ~ 0.80%, the yield point elongation of refrigeration welded tube cold-rolled steel strip products can be eliminated, prevent refrigeration welded tube cold-rolled steel strip products from punching course, occurring Lüders bands, the harm of Lüders bands is, Lüders bands can cause product particularly stamping parts surface quality reduction, waste product, substandard products can be caused, its appearance be prevented.Therefore, the production system of refrigeration welded tube cold rolled strip provided by the invention can improve the ageing resistance performance of refrigeration welded tube cold-rolled steel strip products.
Wherein, as a kind of concrete implementation of Hot Rolling Mill in this production system, the Heating temperature of Hot Rolling Mill is 1250 ± 20 DEG C; Finishing temperature is 930 ± 20 DEG C; Coiling temperature is 730 ± 20 DEG C.
The production method of refrigeration welded tube cold rolled strip provided by the invention comprises hot rolling, cold rolling, annealing and smooth step successively, and the step of annealing is continuous annealing; In cold rolling step, the scope of cold rolling draft is 72 ~ 82%; In continuous annealing step, heating zone temperature is 760 ± 10 DEG C, and annealing temperature is 760 ± 10 DEG C, and slow cooling temperature out is 640 ± 10 DEG C, and rapid cooling temperature out is 410 ± 10 DEG C, and overaging temperature is 375 ± 10 DEG C, and cold temperature out is 175 ± 10 DEG C eventually.
The scope that the invention provides the cold rolling draft in the production method cold rolling step of refrigeration welded tube cold rolled strip is 72 ~ 82%, annealing temperature in continuous annealing step is 760 ± 10 DEG C, cold rolling draft and annealing temperature are all higher, are conducive to { the formation of 111} texture in the recrystallize after cold roller and deformed and annealing process.{ 111} texture directly affects the deep drawability of cold rolled strip, this deep drawability is weighed by its Lankford r value, and the height of this Lankford r value depends on the texture of cold rolled strip, { 111} texture is stronger, { more weak then this Lankford r value of 100} texture is higher, now, the deep drawability of cold rolled strip is better.In continuous annealing step, heating zone temperature is 760 ± 10 DEG C, annealing temperature is 760 ± 10 DEG C, slow cooling temperature out is 640 ± 10 DEG C, namely continuous annealing furnace adopts balance annealing soak temperature, and excessive grain can be avoided thick, keeps a certain amount of Carbide Precipitation to strengthen crystal boundary, reduce continuous annealing step rapid cooling section temperature out to 410 ± 10 DEG C simultaneously, can ensure in process of cooling, increase the bonding force of tiny second-phase at crystal boundary, anti-secondary processing brittleness ability improves.To sum up, not only deep drawability is good for the refrigeration welded tube cold rolled strip that the production method that the invention provides refrigeration welded tube cold rolled strip produces, and anti-secondary processing brittleness ability improves, when it is applied in low temperature environment, it is a kind of anti-low temperature brittleness refrigeration welded tube cold rolled strip.
Wherein, in planarization step, smooth unit elongation is 0.74% ~ 0.80%.Smooth elongation control is 0.74% ~ 0.80%, the yield point elongation of refrigeration welded tube cold-rolled steel strip products can be eliminated, prevent refrigeration welded tube cold-rolled steel strip products from punching course, occurring Lüders bands, the harm of Lüders bands is, Lüders bands can cause product particularly stamping parts surface quality reduction, waste product, substandard products can be caused, its appearance be prevented.Therefore, the production method of refrigeration welded tube cold rolled strip provided by the invention can improve the ageing resistance performance of refrigeration welded tube cold-rolled steel strip products.
Wherein, as a kind of concrete implementation of hot-rolled step in this production method, the Heating temperature of hot-rolled step is 1250 ± 20 DEG C; Finishing temperature is 930 ± 20 DEG C; Coiling temperature is 730 ± 20 DEG C.
Refrigeration welded tube cold rolled strip provided by the invention is produced by production system provided by the invention or production method provided by the invention, and each constituent mass percentage ratio is respectively: C, 0.035-0.045%; Mn, 0.6 ~ 0.8%; Si ,≤0.03%; P ,≤0.015%; S ,≤0.015%; Als ,≤0.04%, N, 0.0030 ~ 0.0050, surplus is Fe.
The invention provides refrigeration welded tube cold rolled strip adopts production system provided by the invention or production method to produce, beneficial effect in production technique with the invention provides that to refrigerate welded tube cold rolled strip be adopt the beneficial effect of production system provided by the invention or production method similar, repeat no more herein.In addition, in the moiety of band steel, C element adds mainly as strengthening element, the corresponding intensity of this cold rolled strip of principal security and hardness, the formation of acicular ferrite can be impelled, and reduce grain boundary ferrite, the acquisition of optimum tenacity be C 0.03% ~ 0.07%, along with the ratio of the increase acicular ferrite of C content increases.Within the specific limits, increase C content to toughness and intensity all useful.But carbon content more than 0.10% after, low-temperature impact toughness declines rapidly.Therefore, in order to ensure that welded tube has good low-temperature flexibility, must the strict carbon content controlled in cold rolled strip.Mn is one of main alloy element of proof strength, and this element can reduce the transition temperature of C → A effectively, suppresses the formation of crystal boundary proeutectoid ferrite, impels in weld seam and form acicular ferrite structure.Can effectively suppress crystal boundary proeutectoid ferrite and ferrite side plate in 0.6% ~ 1.6% scope, the ratio of acicular ferrite is improved, obtain very high toughness.Along with the increase of w (Mn)/w (C), toughness decreases, therefore, the reasonable disposition of C and Mn must be considered in alloy system, the content of C is 0.035-0.045%, when Mn content is 0.6-0.8%, can ensure at low ambient temperatures, the invention provides refrigeration welded tube cold rolled strip and there is higher toughness.S, P, as impurity element, can make welded tube plasticity and toughness and anti-fragility reduce, therefore will strictly control its content in weld seam, therefore, need to control at S≤0.015%, P≤0.015%.See accompanying drawing 1, refrigeration welded tube cold rolled strip provided by the invention metallographic structure is typical ferrite equi-axed crystal, and grain fineness number is 8.5 grades, crystal grain is dispersed with the cementite particle of disperse, and the block perlite of a small amount of intercrystalline precipitation.
Refrigeration welded tube provided by the invention is formed by refrigeration welded tube cold rolled strip provided by the invention manufacture, and because this cold rolled strip has the performance of anti-low temperature brittleness, therefore, this refrigeration welded tube also has the performance of anti-low temperature brittleness.
Embodiment 1 ~ 5
It is as shown in table 1 that the embodiment of the present invention 1 ~ 5 to refrigerate in welded tube cold rolled strip each parameter in each component and production system or production method.
The mechanical performance index that the embodiment of the present invention 1 ~ 5 refrigerates welded tube cold rolled strip corresponding is as shown in table 2.
The embodiment of the present invention 1 ~ 5 refrigerates metallographic structure photo corresponding to welded tube cold rolled strip as shown in Figure 1.
Table 1 embodiment 1 ~ 5 to refrigerate in welded tube cold rolled strip each parameter in each component and production system or method
Table 2 embodiment 1 ~ 5 refrigerates mechanical performance index corresponding to welded tube cold rolled strip
As can be seen from Table 2, refrigeration welded tube cold rolled strip provided by the invention is 130 ~ 140J at the shock absorption energy of-10 DEG C, be 120 ~ 130J at the shock absorption energy of-20 DEG C, be 100 ~ 105J at the shock absorption energy of-25 DEG C, ReL is at 190 ~ 220MPa, A50 is in 43% ~ 45%, r value 1.5 ~ 1.6, and mechanical property meets the requirement of low temperature flux-cored wire steel.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. one kind refrigerates the production system of welded tube cold rolled strip, comprise Hot Rolling Mill, cold mill complex, annealing furnace and levelling machine, refrigeration welded tube strand obtains refrigeration welded tube cold rolled strip successively after described Hot Rolling Mill, cold mill complex, annealing furnace and levelling machine, it is characterized in that, described annealing furnace is continuous annealing furnace;
The scope of the cold rolling draft of described cold mill complex is 72 ~ 82%;
Described continuous annealing furnace heating zone temperature is 760 ± 10 DEG C, and annealing temperature is 760 ± 10 DEG C, and slow cooling temperature out is 640 ± 10 DEG C, and rapid cooling temperature out is 410 ± 10 DEG C, and overaging temperature is 375 ± 10 DEG C, and cold temperature out is 175 ± 10 DEG C eventually.
2. production system according to claim 1, is characterized in that, the smooth unit elongation of described levelling machine is 0.74% ~ 0.80%.
3. production system according to claim 1 and 2, is characterized in that, the Heating temperature of described Hot Rolling Mill is 1250 ± 20 DEG C; Finishing temperature is 930 ± 20 DEG C; Coiling temperature is 730 ± 20 DEG C.
4. refrigerate a production method for welded tube cold rolled strip, comprise hot rolling, cold rolling, annealing and smooth step successively, it is characterized in that, the step of described annealing is continuous annealing;
In described cold rolling step, the scope of cold rolling draft is 72 ~ 82%;
In described continuous annealing step, heating zone temperature is 760 ± 10 DEG C, and annealing temperature is 760 ± 10 DEG C, and slow cooling temperature out is 640 ± 10 DEG C, and rapid cooling temperature out is 410 ± 10 DEG C, and overaging temperature is 375 ± 10 DEG C, and cold temperature out is 175 ± 10 DEG C eventually.
5. production method according to claim 4, is characterized in that, the smooth unit elongation of described planarization step is 0.74% ~ 0.80%.
6. the production method according to claim 4 or 5, is characterized in that, the Heating temperature of described hot-rolled step is 1250 ± 20 DEG C; Finishing temperature is 930 ± 20 DEG C; Coiling temperature is 730 ± 20 DEG C.
7. the refrigeration welded tube cold rolled strip produced by arbitrary described production method in described production system arbitrary in claims 1 to 3 or claim 4 ~ 6, it is characterized in that, each constituent mass percentage ratio is respectively: C, 0.035-0.045%; Mn, 0.6 ~ 0.8%; Si ,≤0.03%; P ,≤0.015%; S ,≤0.015%; Als ,≤0.04%, N, 0.0030 ~ 0.0050, surplus is Fe.
8. refrigerate a welded tube, it is characterized in that, formed by cold rolled strip manufacture according to claim 7.
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| CN113416821A (en) * | 2021-06-24 | 2021-09-21 | 新疆八一钢铁股份有限公司 | Annealing process for Q235-W steel grade of spiral welded pipe |
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| CN111663077A (en) * | 2020-06-03 | 2020-09-15 | 新余钢铁股份有限公司 | Light panel steel strip and manufacturing method thereof |
| CN112760462A (en) * | 2020-12-17 | 2021-05-07 | 包头钢铁（集团）有限责任公司 | Preparation method of steel for flux-cored wire |
| CN113416821A (en) * | 2021-06-24 | 2021-09-21 | 新疆八一钢铁股份有限公司 | Annealing process for Q235-W steel grade of spiral welded pipe |
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Application publication date: 20150107 |