CN111020146A - Steel rolling heating method for controlling 82B net carbon - Google Patents
Steel rolling heating method for controlling 82B net carbon Download PDFInfo
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- CN111020146A CN111020146A CN201911383534.6A CN201911383534A CN111020146A CN 111020146 A CN111020146 A CN 111020146A CN 201911383534 A CN201911383534 A CN 201911383534A CN 111020146 A CN111020146 A CN 111020146A
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- heating
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- section
- burner
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 59
- 238000005096 rolling process Methods 0.000 title claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 27
- 239000010959 steel Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 20
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 230000033764 rhythmic process Effects 0.000 claims abstract description 12
- 229910001567 cementite Inorganic materials 0.000 claims abstract description 9
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000002791 soaking Methods 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 239000003034 coal gas Substances 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000005204 segregation Methods 0.000 description 2
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- -1 net carbon for short Chemical compound 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Classifications
-
- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- 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
- C21D1/34—Methods of heating
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a steel rolling heating method for controlling 82B net carbon, which comprises the following steps of (1) preheating section temperature range of 650-750 ℃ and heating time duration of 40 minutes; the temperature range of the heating section is 1150-1180 ℃, and the heating time is 50 minutes; the temperature range of the soaking section is 1040-1060 ℃, and the heating time is 40 minutes; the initial rolling temperature is 970-980 ℃; the rolling time of the four sections is 75 s/piece, and the rolling rhythm is 25 s; (2) the heating method of the 82B stranded wire steel comprises the following steps: the temperature on the section and the length must be ensured to have better uniformity in the billet heating process, the generation of reticular cementite due to uneven tissue in the rolling controlled cooling process is avoided, and the control standard is as follows: the temperature difference of the cross section is less than 30 ℃, the longitudinal temperature difference of the head and the tail is less than 30 ℃, and (3) the rolling rhythm is determined, the original final rolling speed is reduced from 32 m/s to 29 m/s according to a heating temperature system, the rolling time of each steel is improved from 68 s to 75s, and the rolling rhythm is calculated to be 25s according to the heating time length and the number of the steel billets in the furnace.
Description
Technical Field
The invention relates to a steel rolling heating method for controlling 82B net carbon.
Background
At present, when 82B products are produced, according to a common heating mode, C, Mn and Cr elements are seriously segregated, a central net-shaped cementite, namely net carbon for short, is easily formed, and the later deep processing of the products is influenced because the pen-point-shaped fracture defect is easily caused when the products are drawn in the next procedure. This heating method is less effective in suppressing or reducing the carbon content of the center net.
Disclosure of Invention
The invention aims to provide a method for controlling the heating of 82B net carbon in rolled steel, which can effectively inhibit or eliminate the generation of 82B net carbon and improve the comprehensive performance of products.
The invention aims to realize the purpose, and the method for controlling the heating of the 82B net carbon in the rolled steel is operated according to the following steps: (1) determining a heating temperature control standard and a heating time control standard of 82B stranded steel: the temperature range of the preheating section is 650-750 ℃, and the heating time is 40 minutes; the temperature range of the heating section is 1150-1180 ℃, and the heating time is 50 minutes; the temperature range of the soaking section is 1040-1060 ℃, and the heating time is 40 minutes; the initial rolling temperature is 970-980 ℃; the rolling time of the four sections is 75 s/piece, and the rolling rhythm is 25 s; (2) the heating method of the 82B stranded wire steel comprises the following steps: the temperature on the section and the length must be ensured to have better uniformity in the billet heating process, the generation of reticular cementite due to uneven tissue in the rolling controlled cooling process is avoided, and the control standard is as follows: the temperature difference of the cross section is less than 30 ℃, the longitudinal temperature difference of the head and the tail is less than 30 ℃, and the control parameters of the steel burning mode are as follows: a. a preheating section, wherein the calorific value of the coal gas is 2400 Kcal/kg; b. a heating section: the opening of the upper adjusting valve is 50 percent, the burner is fully opened, the opening of the burner butterfly valve is 30 percent, the opening of the lower adjusting valve is 30 percent, the burner is fully opened, the opening of the burner butterfly valve is 40 percent, and the calorific value of coal gas is 2400 Kcal/kg; c. a soaking section: the opening of the upper uniform regulating valve is 10%, the first row of burners are fully opened, the opening of the burner butterfly valve is 10%, the other rows of burners from 2 nd to 4 th are fully closed, and the opening of the burner butterfly valve is 0%; the opening of a lower uniform left and right adjusting valve is 10%, the opening of a lower uniform left and right burner is fully opened, the opening of a burner butterfly valve is 5%, the opening of a lower uniform middle adjusting valve is 5%, the opening of a lower uniform middle burner is fully opened, the opening of a lower uniform middle burner butterfly valve is 2%, and the calorific value of coal gas is 2400 Kcal/kg; (3) determining the rolling rhythm, reducing the original finishing speed from 32 m/s to 29 m/s according to a heating temperature system, increasing the rolling time of each steel from 68 s to 75s, and calculating the rolling rhythm to be 25s according to the heating time length and the number of the billets in the furnace.
Because 82B stranded steel has high carbon content and belongs to eutectoid steel, the segregation of elements such as C, Mn, Cr and the like is easy to generate reticular cementite, and the steel is easy to brittle fracture during drawing and twisting and mainly shows a pen-point fracture and a cup-cone fracture. To eliminate or reduce the generation of 82B net carbon, the main control means is to control the segregation degree of a casting blank in steel making, and on the other hand, the heating temperature and the cooling speed are controlled by a steel rolling link to avoid the occurrence of central net cementite, so that a large proportion of sorbite is obtained to ensure the comprehensive performance of a wire rod.
Under the condition that the rolling process and the cooling mode are not changed, the practice of the heating mode is carried out, the temperature difference of the cross section of the billet discharged from the heating furnace is 25 ℃, the temperature difference of the longitudinal length is 30 ℃, the target temperature is reached, the Soxhlet rate of the finished product of the 12.5mm82B product reaches 85% from the original 80%, the tensile strength is increased to 1180MPa from the original 1160MPa, the crystal phase of the cross section of the product is shown as Soxhlet and a small amount of pearlite, the metallographic graph shows that no reticular cementite appears in a 98% area, the tissue distribution proportion of the reticular cementite is less than 2%, the plasticity and the mechanical property are obviously improved, and the comprehensive property is greatly improved.
The specific implementation mode is as follows:
a method for controlling the heating of 82B net carbon in rolled steel is carried out according to the following steps: (1) determining a heating temperature control standard and a heating time control standard of 82B stranded steel: according to the heating characteristics of the 82B product, temperature control ranges of a preheating section, a heating section and a soaking section of the 82B blank in a three-section walking beam type heating furnace are set, the temperature range of the preheating section is 650-; the temperature range of the heating section is 1150-1180 ℃, and the heating time is 50 minutes; the temperature range of the soaking section is 1040-1060 ℃, and the heating time is 40 minutes; the initial rolling temperature is 970-980 ℃; the rolling time of the four sections is 75 s/piece, and the rolling rhythm is 25 s; (2) the heating method of the 82B stranded wire steel comprises the following steps: the temperature on the section and the length must be ensured to have better uniformity in the billet heating process, the generation of reticular cementite due to uneven tissue in the rolling controlled cooling process is avoided, and the control standard is as follows: the temperature difference of the cross section is less than 30 ℃, the longitudinal temperature difference of the head and the tail is less than 30 ℃, and the control parameters of the steel burning mode are as follows: a. a preheating section, wherein the calorific value of the coal gas is 2400 Kcal/kg; b. a heating section: the opening of the upper adjusting valve is 50 percent, the burner is fully opened, the opening of the burner butterfly valve is 30 percent, the opening of the lower adjusting valve is 30 percent, the burner is fully opened, the opening of the burner butterfly valve is 40 percent, and the calorific value of coal gas is 2400 Kcal/kg; c. a soaking section: the opening of the upper uniform regulating valve is 10%, the first row of burners are fully opened, the opening of the burner butterfly valve is 10%, the other rows of burners from 2 nd to 4 th are fully closed, and the opening of the burner butterfly valve is 0%; the opening of a lower uniform left and right adjusting valve is 10%, the opening of a lower uniform left and right burner is fully opened, the opening of a burner butterfly valve is 5%, the opening of a lower uniform middle adjusting valve is 5%, the opening of a lower uniform middle burner is fully opened, the opening of a lower uniform middle burner butterfly valve is 2%, and the calorific value of coal gas is 2400 Kcal/kg; (3) determining the rolling rhythm, reducing the original finishing speed from 32 m/s to 29 m/s according to a heating temperature system, increasing the rolling time of each steel from 68 s to 75s, and calculating the rolling rhythm to be 25s according to the heating time length and the number of the billets in the furnace.
The method adopts a three-section walking beam type heating furnace for heating, the distribution mode of the burners is the prior art, and the structure performance of the product can be effectively ensured according to the heating control method.
Claims (1)
1. A steel rolling heating method for controlling 82B net carbon is characterized in that: the operation is carried out according to the following steps:
(1) determining a heating temperature control standard and a heating time control standard of 82B stranded steel: the temperature range of the preheating section is 650-750 ℃, and the heating time is 40 minutes; the temperature range of the heating section is 1150-1180 ℃, and the heating time is 50 minutes; the temperature range of the soaking section is 1040-1060 ℃, and the heating time is 40 minutes; the initial rolling temperature is 970-980 ℃; the rolling time of the four sections is 75 s/piece, and the rolling rhythm is 25 s;
(2) the heating method of the 82B stranded wire steel comprises the following steps: the temperature on the section and the length must be ensured to have better uniformity in the billet heating process, the generation of reticular cementite due to uneven tissue in the rolling controlled cooling process is avoided, and the control standard is as follows: the temperature difference of the cross section is less than 30 ℃, the longitudinal temperature difference of the head and the tail is less than 30 ℃, and the control parameters of the steel burning mode are as follows:
a. a preheating section, wherein the calorific value of the coal gas is 2400 Kcal/kg;
b. a heating section: the opening of the upper adjusting valve is 50 percent, the burner is fully opened, the opening of the burner butterfly valve is 30 percent, the opening of the lower adjusting valve is 30 percent, the burner is fully opened, the opening of the burner butterfly valve is 40 percent, and the calorific value of coal gas is 2400 Kcal/kg;
c. a soaking section: the opening of the upper uniform regulating valve is 10%, the first row of burners are fully opened, the opening of the burner butterfly valve is 10%, the other rows of burners from 2 nd to 4 th are fully closed, and the opening of the burner butterfly valve is 0%; the opening of a lower uniform left and right adjusting valve is 10%, the opening of a lower uniform left and right burner is fully opened, the opening of a burner butterfly valve is 5%, the opening of a lower uniform middle adjusting valve is 5%, the opening of a lower uniform middle burner is fully opened, the opening of a lower uniform middle burner butterfly valve is 2%, and the calorific value of coal gas is 2400 Kcal/kg;
(3) determining the rolling rhythm, reducing the original finishing speed from 32 m/s to 29 m/s according to a heating temperature system, increasing the rolling time of each steel from 68 s to 75s, and calculating the rolling rhythm to be 25s according to the heating time length and the number of the billets in the furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911383534.6A CN111020146A (en) | 2019-12-27 | 2019-12-27 | Steel rolling heating method for controlling 82B net carbon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911383534.6A CN111020146A (en) | 2019-12-27 | 2019-12-27 | Steel rolling heating method for controlling 82B net carbon |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111020146A true CN111020146A (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911383534.6A Pending CN111020146A (en) | 2019-12-27 | 2019-12-27 | Steel rolling heating method for controlling 82B net carbon |
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| Country | Link |
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| CN (1) | CN111020146A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113600623A (en) * | 2021-08-06 | 2021-11-05 | 新疆八一钢铁股份有限公司 | Method for inhibiting high-carbon steel wire rod SWRH82B core net-shaped cementite |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU286725A1 (en) * | 1969-04-21 | 1981-03-23 | Институт черной металлургии | Method of rod material treatment |
| CN102240672A (en) * | 2011-05-25 | 2011-11-16 | 西安盛日机电科技有限公司 | Process for producing high-speed wire rod by adopting grooveless rolling |
| CN102876983A (en) * | 2012-09-29 | 2013-01-16 | 攀钢集团成都钢钒有限公司 | Production process for 82B wire rod used for high strength prestressed steel wire and wire rod thereof |
| CN104084421A (en) * | 2014-06-19 | 2014-10-08 | 西安盛日机电科技有限公司 | Production process for grooveless rolling of 82B wire rod by high-speed wire mill |
| CN104789880A (en) * | 2015-03-03 | 2015-07-22 | 张家港联峰钢铁研究所有限公司 | Steel strand wire rod with characteristics of low carbon, high strength and high toughness, and production process thereof |
-
2019
- 2019-12-27 CN CN201911383534.6A patent/CN111020146A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU286725A1 (en) * | 1969-04-21 | 1981-03-23 | Институт черной металлургии | Method of rod material treatment |
| CN102240672A (en) * | 2011-05-25 | 2011-11-16 | 西安盛日机电科技有限公司 | Process for producing high-speed wire rod by adopting grooveless rolling |
| CN102876983A (en) * | 2012-09-29 | 2013-01-16 | 攀钢集团成都钢钒有限公司 | Production process for 82B wire rod used for high strength prestressed steel wire and wire rod thereof |
| CN104084421A (en) * | 2014-06-19 | 2014-10-08 | 西安盛日机电科技有限公司 | Production process for grooveless rolling of 82B wire rod by high-speed wire mill |
| CN104789880A (en) * | 2015-03-03 | 2015-07-22 | 张家港联峰钢铁研究所有限公司 | Steel strand wire rod with characteristics of low carbon, high strength and high toughness, and production process thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113600623A (en) * | 2021-08-06 | 2021-11-05 | 新疆八一钢铁股份有限公司 | Method for inhibiting high-carbon steel wire rod SWRH82B core net-shaped cementite |
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Application publication date: 20200417 |