CN115255302A - Full-process crack control method for high-carbon high-alloy steel - Google Patents
Full-process crack control method for high-carbon high-alloy steel Download PDFInfo
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- CN115255302A CN115255302A CN202211047163.6A CN202211047163A CN115255302A CN 115255302 A CN115255302 A CN 115255302A CN 202211047163 A CN202211047163 A CN 202211047163A CN 115255302 A CN115255302 A CN 115255302A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1213—Accessories for subsequent treating or working cast stock in situ for heating or insulating strands
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/163—Controlling or regulating processes or operations for cutting cast stock
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Heat Treatment Processes (AREA)
Abstract
The invention relates to the technical field of metallurgy, in particular to a full-flow crack control method for high-carbon high-alloy steel, which comprises the following steps of sending a continuous casting blank into a heating furnace at a high temperature (higher than 600 ℃) after being off-line, or sending the continuous casting blank into a rolling furnace after being quickly stacked and slowly cooled for 24-48h after being off-line, wherein the charging temperature of the slowly cooled casting blank is higher than 400 ℃; the temperature of the heating section 1 after entering the heating furnace is controlled to be 800-950 ℃, and the heating speed is 80 ℃/h; the temperature of the heating section 2 is controlled to be 920-1150 ℃, and the heating speed is 120 ℃/h; the temperature of the heating section 3 is controlled to be 1120-1200 ℃, the heating speed is 150 ℃/h, and the temperature of the soaking section is controlled to be 1150-1250 ℃; after rolling, the steel plates are quickly stacked and slowly cooled, wherein the stacking temperature is 300-400 ℃, and the cutting temperature is 180-250 ℃. The temperature difference between the inner part and the outer part of the casting blank and the steel plate is always kept in a reasonable range, so that internal cracks, surface cracks and cutting cracks caused by stress concentration are avoided, and the good plate shape of a product is kept.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a full-process crack control method for high-carbon high-alloy steel.
Background
The die steel is generally high in C (C is more than 0.3%), cr (Cr is more than 0.8%) and Mo (Mo is more than 0.1%), has high crack sensitivity, is easy to cause the phenomena of billet and steel plate fracture or local fracture of a cutting surface due to fire cleaning, furnace heating, cutting, straightening and the like in a cold state, and needs to be specially controlled in the heating or cooling process.
Disclosure of Invention
The invention aims to provide a full-process crack prevention control method for high-carbon high-alloy steel, which can reduce the stress difference between the inside and the outside of a casting blank and avoid internal cracks, surface cracks and cutting cracks caused by stress concentration.
The technical scheme adopted by the invention for solving the technical problem is as follows: a full-flow crack control method for high-carbon high-alloy steel comprises the following steps:
(1) The section of the casting blank is 300 × 1820-2200mm, the continuous casting blank is delivered into a heating furnace at high temperature after being taken off line, the furnace temperature is more than 600 ℃, or the continuous casting blank is rapidly stacked and slowly rolled for 24-48h after being taken off line, and the charging temperature of the slowly-cooled casting blank is more than 400 ℃;
(2) The temperature of the post-heating section 1 of the heating furnace is controlled to be 800-950 ℃, and the heating speed is 80 ℃/h; the temperature of the heating section 2 is controlled to be 920-1150 ℃, and the heating speed is 120 ℃/h; the temperature of the heating section 3 is controlled to be 1120-1200 ℃, the heating speed is 150 ℃/h, and the temperature of the soaking section is controlled to be 1150-1250 ℃;
(3) Rapidly stacking and slowly cooling the rolled steel plates at the stacking temperature of 300-400 ℃;
(4) Cutting the steel plate at 180-250 ℃ with temperature;
(5) And the ultrasonic flaw detection is adopted to detect the internal quality of the steel plate, and the surface quality of the steel plate is detected by a meter detector.
The invention has the following beneficial effects: the invention carries out temperature control in the links of steel billet feeding, heating system, cooling of rolled steel plates and the like which are easy to generate rapid cooling and rapid heating, combines the characteristics of products, adopts high-temperature feeding and rolling or carries out feeding and rolling after rapid stacking and slow cooling for 24-48h after the products are off line, the charging temperature of the slowly-cooled casting blank is more than 400 ℃, the production efficiency can be improved, and the energy can be saved; the heating speed and the heating temperature are controlled, the product is guaranteed to be heated uniformly and slowly, the stress difference between the inside and the outside of a casting blank is reduced, meanwhile, steel plate stacking slow cooling and warm cutting are adopted, delayed cutting cracks of the product are avoided, the product is guaranteed to be free of defects, the uniformity of product performance is facilitated, and the product is kept in a good plate shape.
Detailed Description
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the scope of the present invention is not limited to these examples. All changes, modifications and equivalents that do not depart from the spirit of the invention are intended to be included within the scope thereof.
A full-process anti-crack control method for high-carbon high-alloy steel comprises the following steps:
(1) The section of the casting blank is 300 × 1820-2200mm, the continuous casting blank is delivered into a heating furnace at high temperature (more than 600 ℃) after being off line, or is delivered into a rolling way after being rapidly stacked and slowly stacked for 24-48 hours after being off line, and the charging temperature of the slowly-cooled casting blank is more than 400 ℃;
(2) The temperature of the post-heating section 1 of the heating furnace is controlled to be 800-950 ℃, and the heating speed is 80 ℃/h; the temperature of the heating section 2 is controlled to be 920-1150 ℃, and the heating speed is 120 ℃/h; the temperature of the heating section 3 is controlled to be 1120-1200 ℃, the heating speed is 150 ℃/h, and the temperature of the soaking section is controlled to be 1150-1250 ℃;
(3) After rolling, the steel plates are quickly stacked and slowly cooled, and the stacking temperature is 300-400 ℃;
(4) Cutting the steel plate at 180-250 ℃ with temperature;
(5) And the ultrasonic flaw detection is adopted to detect the internal quality of the steel plate, and the surface quality of the steel plate is detected by a meter detector.
According to the invention, the high-temperature feeding of the casting blank, the slow cooling, the slow heating and the cutting with temperature are ensured by controlling the steel feeding mode, the feeding temperature of the casting blank, the heating temperature and the heating speed of each section, the stacking temperature of the steel plate and the cutting temperature of the steel plate, and the internal and external temperature difference of the casting blank and the steel plate is always kept in a reasonable range, so that internal cracking, surface cracking and cutting cracking caused by stress concentration are avoided.
Example 1: a full-process anti-crack control method for high-carbon high-alloy steel comprises the following specific processes:
300 x 1820mm of the section of a casting blank, cutting the casting blank off line and sizing the casting blank by online flame cutting, measuring by a handheld temperature measuring gun, after secondary cutting, the upper surface center temperature of the casting blank is 756 ℃, sizing the casting blank, then rapidly feeding the casting blank into steel rolling through a roller way, heating the steel by a stepping heating furnace, measuring the upper surface temperature of the casting blank by an online pyrometer in front of the heating furnace, averaging, feeding the temperature into the furnace to be 638 ℃, heating the casting blank at a speed of 80 ℃/h, heating the casting blank for 2h to 800 ℃, heating the heating section two at a speed of 120 ℃/h, heating the heating section two at a speed of 1.25h to 950 ℃, heating the heating section three at a speed of 150 ℃/h, stacking the casting blank for 1.4h to 1160 ℃, feeding the steel into a soaking section, preserving heat for 1 h, then tapping the steel at a temperature of 1160 ℃, after secondary rolling, discharging the steel from a cooling bed, stacking the steel plate at a temperature of 325 ℃, detecting the temperature, cutting the steel plate when the surface temperature of the steel plate is 200 ℃, and feeding the steel plate to sizing the casting blank into a heat treatment furnace for heat treatment.
And (3) cooling the steel plate after heat treatment to room temperature, and performing ultrasonic flaw detection on the surface of the steel plate, wherein the flaw detection grade of the steel plate meets the secondary flaw detection requirement of GB/T2970 customers, the surface quality of the steel plate is good, and the plate type meets the requirement of 5 mm/m.
Example 2: a full-process crack control method for high-carbon high-alloy steel comprises the following specific processes:
300 x 2000mm of the section of a casting blank, cutting the casting blank off line, performing online flame cutting sizing, measuring by a handheld temperature measuring gun, after secondary cutting, keeping the upper center temperature of the casting blank at 760 ℃, stacking after sizing, slowly cooling for 24h, then sending to rolling, heating by a stepping heating furnace, measuring the upper surface temperature of the casting blank by an online pyrometer in front of the heating furnace, averaging, heating at 426 ℃ at a speed of 80 ℃/h, heating at a speed of 80 ℃/h for 5.9h to 900 ℃, heating at a speed of 120 ℃/h in a second heating section, heating at a speed of 1092 ℃ after 1.6h, heating at a speed of 150 ℃/h in a third heating section, heating at a speed of 1197 h, entering a soaking section, preserving heat for 0.5 h, tapping at a temperature of 1200 ℃, after two-stage rolling, taking off line from a cooling bed, stacking at a temperature of 362 ℃ of a steel plate, cooling for 27h, detecting the stacking temperature, cutting at a temperature of 220 ℃ of the surface of the steel plate, sizing, and sending to a heat treatment furnace for heat treatment.
And (3) cooling the steel plate after heat treatment to room temperature, and performing ultrasonic flaw detection on the surface of the steel plate, wherein the flaw detection grade of the steel plate meets the secondary flaw detection requirement of GB/T2970 customers, the surface quality of the steel plate is good, and the plate type meets the requirement of 4 mm/m.
Example 3: a full-process crack control method for high-carbon high-alloy steel comprises the following specific processes:
300 x 2200mm in section of the casting blank, cutting the casting blank off line, carrying out online flame cutting sizing, measuring by a handheld temperature measuring gun, controlling the upper surface center temperature of the casting blank to be 760 ℃ after secondary cutting, rapidly feeding the casting blank into steel rolling through a roller way after sizing, heating by a stepping heating furnace, measuring the upper surface temperature of the casting blank by an online pyrometer in front of the heating furnace, taking an average value, controlling the feeding temperature to be 652 ℃, heating at a speed of 80 ℃/h, heating for 3.7h to 948 ℃, heating at a speed of 120 ℃/h in a second heating section, heating for 1.6h to 1140 ℃, heating at a speed of 150 ℃/h in a third heating section, heating for 0.4h to 1200 ℃, entering a soaking section, preserving heat for 0.5 h, tapping at 1210 ℃, rolling in a second stage, taking off line from a cooling bed, stacking at a temperature of 384 ℃, slowly cooling for 30h, detecting the stacking temperature, cutting sizing when the surface temperature of the steel plate reaches 246 ℃, and feeding into a heat treatment furnace for heat treatment.
And (3) cooling the steel plate after heat treatment to room temperature, and then carrying out ultrasonic flaw detection on the surface of the steel plate, wherein the flaw detection grade of the steel plate meets the secondary flaw detection requirement of a client GB/T2970, the surface quality of the steel plate is good, and the plate type meets the requirement of 5 mm/m.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (1)
1. A full-flow crack control method for high-carbon high-alloy steel is characterized by comprising the following steps:
(1) The section of the casting blank is 300 × 1820-2200mm, the continuous casting blank is delivered into a heating furnace at high temperature after being taken off line, the furnace temperature is higher than 600 ℃, the continuous casting blank is rapidly stacked after being taken off line and is delivered and rolled after being slowly stacked for 24-48h, and the charging temperature of the slowly cooled casting blank is higher than 400 ℃;
(2) The temperature of the post-heating section 1 of the heating furnace is controlled to be 800-950 ℃, and the heating speed is 80 ℃/h; the temperature of the heating section 2 is controlled to be 920-1150 ℃, and the heating speed is 120 ℃/h; the temperature of the heating section 3 is controlled to be 1120-1200 ℃, the heating speed is 150 ℃/h, and the temperature of the soaking section is controlled to be 1150-1250 ℃;
(3) Rapidly stacking and slowly cooling the rolled steel plates at the stacking temperature of 300-400 ℃;
(4) Cutting the steel plate at a temperature of 180-250 ℃ with the aid of a belt temperature;
(5) And the ultrasonic flaw detection is adopted to detect the internal quality of the steel plate, and the surface quality of the steel plate is detected by a meter detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211047163.6A CN115255302A (en) | 2022-08-29 | 2022-08-29 | Full-process crack control method for high-carbon high-alloy steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211047163.6A CN115255302A (en) | 2022-08-29 | 2022-08-29 | Full-process crack control method for high-carbon high-alloy steel |
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| CN115255302A true CN115255302A (en) | 2022-11-01 |
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| CN202211047163.6A Pending CN115255302A (en) | 2022-08-29 | 2022-08-29 | Full-process crack control method for high-carbon high-alloy steel |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0255612A (en) * | 1988-08-17 | 1990-02-26 | Kobe Steel Ltd | Gradually cooling device for steel material on cooling floor |
| CN103602775A (en) * | 2013-12-09 | 2014-02-26 | 南京钢铁股份有限公司 | Method for effectively controlling generation of central cracks in medium-carbon steel plate |
| CN111673059A (en) * | 2020-07-28 | 2020-09-18 | 攀钢集团西昌钢钒有限公司 | Converter pretreatment and cold charging heating method for high-carbon high-alloy continuous casting billet |
| CN113278878A (en) * | 2021-04-01 | 2021-08-20 | 江阴兴澄特种钢铁有限公司 | Hydrogen-induced cracking resistant pressure vessel steel plate with thickness of more than 200-250 mm and manufacturing method thereof |
| CN113564457A (en) * | 2021-06-25 | 2021-10-29 | 江苏沙钢集团有限公司 | Tempered and pre-hardened plastic die steel plate and preparation method thereof |
-
2022
- 2022-08-29 CN CN202211047163.6A patent/CN115255302A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0255612A (en) * | 1988-08-17 | 1990-02-26 | Kobe Steel Ltd | Gradually cooling device for steel material on cooling floor |
| CN103602775A (en) * | 2013-12-09 | 2014-02-26 | 南京钢铁股份有限公司 | Method for effectively controlling generation of central cracks in medium-carbon steel plate |
| CN111673059A (en) * | 2020-07-28 | 2020-09-18 | 攀钢集团西昌钢钒有限公司 | Converter pretreatment and cold charging heating method for high-carbon high-alloy continuous casting billet |
| CN113278878A (en) * | 2021-04-01 | 2021-08-20 | 江阴兴澄特种钢铁有限公司 | Hydrogen-induced cracking resistant pressure vessel steel plate with thickness of more than 200-250 mm and manufacturing method thereof |
| CN113564457A (en) * | 2021-06-25 | 2021-10-29 | 江苏沙钢集团有限公司 | Tempered and pre-hardened plastic die steel plate and preparation method thereof |
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