CN109530429B - Rolling process for stably producing martensite air valve steel rolled blank - Google Patents
Rolling process for stably producing martensite air valve steel rolled blank Download PDFInfo
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- CN109530429B CN109530429B CN201811350695.0A CN201811350695A CN109530429B CN 109530429 B CN109530429 B CN 109530429B CN 201811350695 A CN201811350695 A CN 201811350695A CN 109530429 B CN109530429 B CN 109530429B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 68
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 51
- 239000010959 steel Substances 0.000 title claims abstract description 51
- 229910000734 martensite Inorganic materials 0.000 title claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000005520 cutting process Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000000137 annealing Methods 0.000 claims abstract description 9
- 238000009749 continuous casting Methods 0.000 claims abstract description 8
- 230000011218 segmentation Effects 0.000 claims abstract description 3
- 239000000498 cooling water Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 9
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 238000010008 shearing Methods 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000005336 cracking Methods 0.000 abstract description 6
- 239000000126 substance Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 239000012496 blank sample Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/04—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing in a continuous process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
- B21B27/106—Heating the rolls
-
- 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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a rolling process for stably producing a martensite gas valve steel rolled blank, which comprises the following process steps of 320, 425/280, 280 square continuous casting blank → heating of a stepping heating furnace → a cogging mill → 1# hydraulic shear for head cutting, tail cutting → 160F continuous rolling unit → 2# hydraulic shear for head cutting, segmentation → annealing of a trolley furnace; the problem of surface cracking of a martensite air valve steel rolled blank can be well solved, and the production efficiency can be ensured.
Description
Technical Field
The invention belongs to the technical field of rolling control and cooling control of steel rolling, and relates to a rolling process for stably producing a martensite air valve steel rolled blank.
Background
The martensite air valve steel is a non-negligible one of the current special steel varieties, is a common material for an air valve of an internal combustion engine, does not peel at the temperature of below 900 ℃, has good oxidation resistance and high-temperature strength at the temperature of 600-700 ℃, is widely applied to exhaust valve parts of small and medium diesel engines and trucks, and plays a vital role in the manufacture and development of automobiles. The martensite air valve steel belongs to high alloy steel, and in order to guarantee the product quality in the rolling process, the contact between cooling water and the steel surface is avoided as much as possible. The rolling is a necessary link in the production process of the martensite gas valve steel, and the rolling quality directly influences the comprehensive performance of the finished product steel. The prior rolling process of the martensite air valve steel rolling blank mainly adopts the traditional rolling blank rolling process for production, the traditional rolling process is relatively extensive, high-pressure water descaling, roller cooling and the like can cause the steel to be contacted with water in the rolling process, and the surface of the product is cracked due to the natural cooling mode of the rolling blank, so that the prior rolling process can not meet the requirement of fine rolling of the air valve steel, and a rolling and cooling control process suitable for the martensite air valve steel is absolutely required.
The traditional process flow is as follows:
320 × 425/280 × 280 square continuous casting billet → heating of a stepping heating furnace → high-pressure water descaling → an cogging mill (in a conventional rolling process, the cooling water of a roller is in a normally open state) → 1# hydraulic shear (cutting head and cutting tail) → a continuous rolling mill group (the cooling water of the roller is in a normally open state) → 2# hydraulic shear (cutting head and segmenting) → a cold bed (natural cooling).
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a rolling process for stably producing a martensite gas valve steel rolled blank, which can not only well solve the problem of surface cracking of the martensite gas valve steel rolled blank, but also ensure the production efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows: a rolling process for stably producing a martensite gas valve steel rolled blank comprises the following process steps of 320, 425/280, 280 square continuous casting blank → heating of a stepping heating furnace → a cogging mill → 1# hydraulic shear for head cutting, tail cutting → 160F tandem mill group → 2# hydraulic shear for head cutting, and segment → annealing of a trolley furnace; the method comprises the following specific steps:
the first step is as follows: the blank library checks 320 × 425/280 × 280 square continuous casting blanks to ensure that the surface quality of the blanks meets the appearance quality requirement;
the second step is that: putting the steel billet into a heating furnace for heating, and tapping when the heating temperature and time meet the process requirements;
the third step: the high-pressure water is closed to remove phosphorus, and the martensite air valve steel billet does not remove phosphorus;
the fourth step: before rolling by a cogging mill, slotting by using other billets; during rolling, a soft reduction rolling process is adopted, and cooling water of a roller and a roller way is closed; after each piece of steel is rolled, the roller is air-cooled for about 2 minutes, then the roller is started to cool water for 2 minutes, the flow of the cooling water is controlled according to 35 percent and is about 62 cubic meters per hour, and then the roller is closed to cool the water and pass the steel;
the fifth step: 1# hydraulic shearing head and tail, closing the heat-insulating cover before continuous rolling;
and a sixth step: adjusting the cooling water of the rolling mill before the cooling water is extracted, reducing the cooling water of the rolling mill as much as possible on the premise of ensuring the cooling of the rolling mill, closing the cooling water after the cooling water is reduced, closing the cooling water of the rolling mill before a rolled piece is not bitten into the rolling mill, and automatically opening the cooling water of the rolling mill by a program after the rolled piece is bitten into the rolling mill; after rolling is finished, closing the cooling water of the roller;
the seventh step: the hot saw adopts a No. 2 hydraulic shearing head, segmentation and sampling without cutting the tail;
eighth step: and after finishing and receiving the rolled blank, quickly putting the rolled blank into a furnace for stress relief annealing.
The invention has the positive effects that: the process has the advantages that the front groove of the rolled air valve steel can effectively preheat the roller, the roller cooling water, the high-pressure dephosphorization water and the control continuous rolling cooling water are closed during cogging, molten steel contact can be avoided to the greatest extent, the rolled blank is put into a furnace for stress relief annealing after rolling, residual stress in the rolled blank can be effectively eliminated, and the process well solves the problem of surface cracking of the rolled blank of the martensite air valve steel on the premise of ensuring various physical and chemical properties of the martensite air valve steel.
Detailed Description
The present invention will be further described with reference to the following examples.
The embodiment of the invention takes the quality of the rolled surface of 9 pieces of martensite valve steel as an example, and specifically comprises the following steps:
the first step is that 9 martensitic air valve steel continuous casting billets and 3 martensitic 45 steel continuous casting billets are selected, the section is 320mm × 425mm, and the surface of the billets is guaranteed to meet the appearance quality requirement;
the second step is that: arranging 3 branches of 45 steel in front of 9 branches of air valve steel, sequentially loading into a heating furnace, and normally heating according to a heating process standard;
the third step: after heating is finished, rolling 3 pieces of 45 steel according to the traditional rolling process to prepare for slotting before rolling the martensite air valve steel by a cogging mill;
the fourth step: closing the phosphorus removal device in front of the furnace, wherein the martensite air valve steel does not remove phosphorus;
the fifth step: changing a soft reduction rolling process for the cogging mill, closing the cooling water of the roller when rolling the air valve steel, and performing air cooling for 2 minutes and then discharging the next roller after rolling;
and a sixth step: 1# hydraulic shearing head and tail, closing the heat-insulating cover before continuous rolling;
the seventh step: the program automatically boils water after the billet is bitten into K4 (the first rolling mill for continuous rolling), and similarly, the program automatically boils water after the billet is bitten into K3, K2 and K1 (the last rolling mill for continuous rolling), and simultaneously the cooling water of the roller is reduced as small as possible. When the steel billet is separated from K4, K3, K2 and K1, the cooling water is automatically closed in the program;
eighth step: and after the rolling of the rolled blank is finished, the No. 2 hydraulic shear passes through the cooling bed in sections and rapidly enters the trolley furnace for stress relief annealing. Finishing rolling 9 pieces of martensite air valve steel according to the step;
the ninth step: after the rolled blank is subjected to stress relief annealing, taking a rolled blank sample for physical and chemical property analysis;
after annealing and tapping, the 9 martensitic gas valve steels have good surface quality and no cracking phenomenon, and all the physical and chemical properties are reported to be qualified. The rolling process can be effectively applied to the production of the rolled blank of the martensite gas valve steel, so that the surface quality of the martensite gas valve steel meets the product quality requirement, the fine control of the rolling process of the martensite gas valve steel is realized, the problem of surface cracking of the rolled blank of the martensite gas valve steel is effectively solved, and the rolling quality and the production efficiency of the martensite gas valve steel are improved to the maximum extent. By adopting the rolling process, the phenomenon of over-cracking of the surface of the martensite gas valve steel rolled blank does not occur, the method has good practicability, successfully ensures the stable production of the martensite gas valve steel rolled blank, has greater economic benefit, and can be popularized and applied on similar production lines.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A rolling process for stably producing a martensite gas valve steel rolled blank comprises the following process steps of 320, 425/280, 280 square continuous casting blank → heating of a stepping heating furnace → a cogging mill → 1# hydraulic shear for head cutting, tail cutting → 160F tandem mill group → 2# hydraulic shear for head cutting, and segment → annealing of a trolley furnace; the method is characterized in that: the method comprises the following specific steps:
the first step is as follows: the blank library checks 320 × 425/280 × 280 square continuous casting blanks to ensure that the surface quality of the blanks meets the appearance quality requirement;
the second step is that: putting the steel billet into a heating furnace for heating, and tapping when the heating temperature and time meet the process requirements;
the third step: the high-pressure water is closed to remove phosphorus, and the martensite air valve steel billet does not remove phosphorus;
the fourth step: before rolling by a cogging mill, slotting by using other billets; during rolling, a soft reduction rolling process is adopted, and cooling water of a roller and a roller way is closed; after each piece of steel is rolled, the roller is air-cooled for about 2 minutes, then the roller is started to cool water for 2 minutes, the flow of the cooling water is controlled according to 35 percent and is about 62 cubic meters per hour, and then the roller is closed to cool the water and pass the steel;
the fifth step: 1# hydraulic shearing head and tail, closing the heat-insulating cover before continuous rolling;
and a sixth step: adjusting the cooling water of the rolling mill before the cooling water is extracted, reducing the cooling water of the rolling mill as much as possible on the premise of ensuring the cooling of the rolling mill, closing the cooling water after the cooling water is reduced, closing the cooling water of the rolling mill before a rolled piece is not bitten into the rolling mill, and automatically opening the cooling water of the rolling mill by a program after the rolled piece is bitten into the rolling mill; after rolling is finished, closing the cooling water of the roller;
the seventh step: the hot saw adopts a No. 2 hydraulic shearing head, segmentation and sampling without cutting the tail;
eighth step: and after finishing and receiving the rolled blank, quickly putting the rolled blank into a furnace for stress relief annealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811350695.0A CN109530429B (en) | 2018-11-14 | 2018-11-14 | Rolling process for stably producing martensite air valve steel rolled blank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811350695.0A CN109530429B (en) | 2018-11-14 | 2018-11-14 | Rolling process for stably producing martensite air valve steel rolled blank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109530429A CN109530429A (en) | 2019-03-29 |
| CN109530429B true CN109530429B (en) | 2020-07-28 |
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| CN201811350695.0A Active CN109530429B (en) | 2018-11-14 | 2018-11-14 | Rolling process for stably producing martensite air valve steel rolled blank |
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| CN111676421B (en) * | 2020-05-20 | 2021-09-28 | 樟树市兴隆高新材料有限公司 | Rolling method of martensite air valve steel rolled blank |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2539052B2 (en) * | 1989-08-22 | 1996-10-02 | 株式会社東芝 | Method and apparatus for estimating dog bone height of rolled material |
| CN1186135C (en) * | 2003-07-29 | 2005-01-26 | 宝钢集团上海五钢有限公司 | Productive method for Cr 12 Mov rolling cogging |
| CN100450651C (en) * | 2007-04-04 | 2009-01-14 | 江苏申源特钢有限公司 | Method for producing cogging by air-valve steel rolling |
| CN102836870B (en) * | 2011-06-23 | 2015-04-01 | 宝钢特钢有限公司 | Rolling and cogging production method for large austenite stainless and heat-resistant gas valve steel 21-4N ingot |
| CN108220750A (en) * | 2018-01-15 | 2018-06-29 | 江苏申源特钢有限公司 | A kind of production method of the bright as silver bars of high carbon martensite Valve Steel 85Cr18Mo2V |
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Address after: 512123 special bar plant, MABA Town, Qujiang District, Shaoguan City, Guangdong Province Patentee after: Baowu jiefuyi Special Steel Co.,Ltd. Address before: 512123 special bar plant, MABA Town, Qujiang District, Shaoguan City, Guangdong Province Patentee before: BAOSTEEL SPECIAL STEEL SHAOGUAN Co.,Ltd. |