CN107779580A - It is a kind of to prevent high crack-sensitivity index steel plate from producing the production technology that side is split - Google Patents
It is a kind of to prevent high crack-sensitivity index steel plate from producing the production technology that side is split Download PDFInfo
- Publication number
- CN107779580A CN107779580A CN201610785450.5A CN201610785450A CN107779580A CN 107779580 A CN107779580 A CN 107779580A CN 201610785450 A CN201610785450 A CN 201610785450A CN 107779580 A CN107779580 A CN 107779580A
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- China
- Prior art keywords
- steel plate
- time
- split
- cutting
- rolling
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Classifications
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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
- C21D8/0226—Hot rolling
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
Abstract
It is a kind of to prevent high crack-sensitivity index steel plate from producing the production technology that side is split, it is characterised in that to specifically include herein below：1) slab rolling using high temperature, at a slow speed, big pressing operation；2) slow cooling as early as possible after rolling；3) heat treatment time interval is short；4) chamfered edge reconditioning after cutting.Compared with prior art, the beneficial effects of the invention are as follows：The ratio that steel plate produces edge cracks is reduced to less than 0.5%, thoroughly solves F20 steel plates and the problem split on side is produced in production, cutting, handling and storage process, avoid the generation of a large amount of waste products, realize maximizing the benefits.
Description
Technical field
The present invention relates to a kind of hot rolled strip technique.
Background technology
Blindage protection is with carbon equivalent in steel F20 composition designs more than 0.5%, and steel plate hardness is big, intensity is high, and crack-sensitivity refers to
Number is very high, and cold cracking inclination is very strong.How to avoid F20 steel plates from producing side in production, cutting, handling and storage process to split, be
The problem that enterprise is badly in need of emphasis tackling key problem, solved.
The content of the invention
Prevent high crack-sensitivity index steel plate from producing the production technology that side is split it is an object of the invention to provide a kind of.
To achieve the above object, the present invention is achieved through the following technical solutions：
It is a kind of to prevent high crack-sensitivity index steel plate from producing the production technology that side is split, specifically include herein below：
1) slab rolling using high temperature, at a slow speed, big pressing operation：
High temperature：Steel plate finishing temperature control is more than 960 DEG C；
At a slow speed：Roll linear velocity≤2.5m/s；
Big pressing operation：250mm thick stocks material requires that the reduction ratio of continuous 2 passage reaches more than 30%；200mm thick stocks material will
The reduction ratio of continuous 2 passage is asked to reach more than 25%.
2) slow cooling as early as possible after rolling：
Steel plate enters burial pit stacking slow cooling in time after rolling, enters to cheat temperature >=300 DEG C；Long steel plate puts down face, and short steel plate is put
Above, it is intended to put other hot steel plates up and down, slow cooling goes out to cheat stacking after 36 hours (burial pit will keep drying, without heating).
3) heat treatment time interval is short：
Steel plate uses quenching+lonneal technique, and quenching and lonneal time interval be necessary≤and 8 hours；
Quenching：Hardening heat：920 DEG C ± 10 DEG C, total time inside furnace：1.4min/mm (heating-up time)+3.0min/mm is (net
Soaking time), water cooling of coming out of the stove；
Lonneal：Temperature：225 DEG C ± 10 DEG C, total time inside furnace：2.56min/mm (heating-up time)+4.0min/mm
(net soaking time), air cooling of coming out of the stove；
4) chamfered edge reconditioning after cutting：
All corners must be subjected to chamfered edge grinding process after steel plate cutting scale, be produced with avoiding cutting micro-crack.
Compared with prior art, the beneficial effects of the invention are as follows：
After the program is implemented, the ratio that F20 steel plates produce edge cracks is reduced to less than 0.5%, thoroughly solves F20 steel
Plate produces the problem split on side in production, cutting, handling and storage process, avoids the generation of a large amount of waste products, realizes benefit maximum
Change.
Embodiment
Technical scheme is described in further detail below by specific embodiment.
It is a kind of to prevent high crack-sensitivity index steel plate from producing the production technology that side is split, specifically include herein below：
1) slab rolling using high temperature, at a slow speed, big pressing operation：
High temperature：Steel plate finishing temperature control is more than 960 DEG C；
At a slow speed：Roll linear velocity≤2.5m/s；
Big pressing operation：250mm thick stocks material requires that the reduction ratio of continuous 2 passage reaches more than 30%；200mm thick stocks material will
The reduction ratio of continuous 2 passage is asked to reach more than 25%.
2) slow cooling as early as possible after rolling：
Steel plate enters burial pit stacking slow cooling in time after rolling, enters to cheat temperature >=300 DEG C；Long steel plate puts down face, and short steel plate is put
Above, it is intended to put other hot steel plates up and down, slow cooling goes out to cheat stacking after 36 hours (burial pit will keep drying, without heating).
3) heat treatment time interval is short：
Steel plate uses quenching+lonneal technique, and quenching and lonneal time interval be necessary≤and 8 hours；
Quenching：Hardening heat：920 DEG C ± 10 DEG C, total time inside furnace：1.4min/mm (heating-up time)+3.0min/mm is (net
Soaking time), water cooling of coming out of the stove；
Lonneal：Temperature：225 DEG C ± 10 DEG C, total time inside furnace：2.56min/mm (heating-up time)+4.0min/mm
(net soaking time), air cooling of coming out of the stove；
4) chamfered edge reconditioning after cutting：
All corners must be subjected to chamfered edge grinding process after steel plate cutting scale, be produced with avoiding cutting micro-crack.
Claims (1)
1. a kind of prevent high crack-sensitivity index steel plate from producing the production technology that side is split, it is characterised in that specifically includes in following
Hold：
1) slab rolling using high temperature, at a slow speed, big pressing operation：
High temperature：Steel plate finishing temperature control is more than 960 DEG C；
At a slow speed：Roll linear velocity≤2.5m/s；
Big pressing operation：250mm thick stocks material requires that the reduction ratio of continuous 2 passage reaches more than 30%；200mm thick stocks material requires to connect
The reduction ratio of continuous 2 passages reaches more than 25%；
2) slow cooling as early as possible after rolling：
Steel plate enters burial pit stacking slow cooling in time after rolling, enters to cheat temperature >=300 DEG C；Long steel plate puts down face, and short steel plate puts face,
It is intended to put other hot steel plates up and down, slow cooling goes out to cheat stacking after 36 hours；Burial pit will keep drying, without heating；
3) heat treatment time interval is short：
Steel plate uses quenching+lonneal technique, and quenching and lonneal time interval be necessary≤and 8 hours；
Quenching：Hardening heat：920 DEG C ± 10 DEG C, total time inside furnace：The net soaking time 3.0min/ of heating-up time 1.4min/mm+
Mm, water cooling of coming out of the stove；
Lonneal：Temperature：225 DEG C ± 10 DEG C, total time inside furnace：The net soaking time 4.0min/ of heating-up time 2.56min/mm+
Mm, air cooling of coming out of the stove；
4) chamfered edge reconditioning after cutting：
All corners must be subjected to chamfered edge grinding process after steel plate cutting scale, be produced with avoiding cutting micro-crack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610785450.5A CN107779580B (en) | 2016-08-31 | 2016-08-31 | It is a kind of to prevent high crack-sensitivity index steel plate from generating the production technology that side is split |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610785450.5A CN107779580B (en) | 2016-08-31 | 2016-08-31 | It is a kind of to prevent high crack-sensitivity index steel plate from generating the production technology that side is split |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107779580A true CN107779580A (en) | 2018-03-09 |
| CN107779580B CN107779580B (en) | 2019-06-25 |
Family
ID=61450998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610785450.5A Active CN107779580B (en) | 2016-08-31 | 2016-08-31 | It is a kind of to prevent high crack-sensitivity index steel plate from generating the production technology that side is split |
Country Status (1)
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| CN (1) | CN107779580B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07233415A (en) * | 1994-02-22 | 1995-09-05 | Nippon Steel Corp | Production of high tensile strength steel plate excellent in sour resistance and low temperature toughness |
| CN101962741A (en) * | 2009-07-24 | 2011-02-02 | 宝山钢铁股份有限公司 | Quenched and tempered steel sheet and manufacturing method thereof |
| CN102061424A (en) * | 2010-12-21 | 2011-05-18 | 南阳汉冶特钢有限公司 | Super-thick Q390GJC-Z35 steel plate for high-rise buildings and production method thereof |
| CN102851616A (en) * | 2011-06-30 | 2013-01-02 | 宝山钢铁股份有限公司 | 60 Kg-scale low temperature-quenched and tempered steel plate with good weldability and manufacture method thereof |
| CN103866187A (en) * | 2014-03-24 | 2014-06-18 | 济钢集团有限公司 | Steel plate for 500MPa-level pressure container for resisting sulfide stress corrosion cracking and production method thereof |
-
2016
- 2016-08-31 CN CN201610785450.5A patent/CN107779580B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07233415A (en) * | 1994-02-22 | 1995-09-05 | Nippon Steel Corp | Production of high tensile strength steel plate excellent in sour resistance and low temperature toughness |
| CN101962741A (en) * | 2009-07-24 | 2011-02-02 | 宝山钢铁股份有限公司 | Quenched and tempered steel sheet and manufacturing method thereof |
| CN102061424A (en) * | 2010-12-21 | 2011-05-18 | 南阳汉冶特钢有限公司 | Super-thick Q390GJC-Z35 steel plate for high-rise buildings and production method thereof |
| CN102851616A (en) * | 2011-06-30 | 2013-01-02 | 宝山钢铁股份有限公司 | 60 Kg-scale low temperature-quenched and tempered steel plate with good weldability and manufacture method thereof |
| CN103866187A (en) * | 2014-03-24 | 2014-06-18 | 济钢集团有限公司 | Steel plate for 500MPa-level pressure container for resisting sulfide stress corrosion cracking and production method thereof |
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| Publication number | Publication date |
|---|---|
| CN107779580B (en) | 2019-06-25 |
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