CN111424150A - SPHC hot-rolled pickled plate without transverse crease defect and production method thereof - Google Patents
SPHC hot-rolled pickled plate without transverse crease defect and production method thereof Download PDFInfo
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- CN111424150A CN111424150A CN202010393905.5A CN202010393905A CN111424150A CN 111424150 A CN111424150 A CN 111424150A CN 202010393905 A CN202010393905 A CN 202010393905A CN 111424150 A CN111424150 A CN 111424150A
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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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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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
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- 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
- C21D2211/005—Ferrite
-
- 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
- C21D2211/009—Pearlite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention provides an SPHC hot-rolled pickled plate without transverse crease defect and a production method thereof, and the SPHC hot-rolled pickled plate comprises the following components: less than or equal to 0.10 percent of C, less than or equal to 0.05 percent of Si, less than or equal to 0.60 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, and the balance of Fe and inevitable impurities. Compared with the prior art, the invention can ensure that the common acid-washing carbon steel obtains good surface quality through reasonable component design, smelting, continuous casting, heating, hot rolling, cooling, coiling and acid washing process optimization, the surface of the strip steel has no transverse crease mark, and the product quality after the hot-rolling low-carbon steel is uncoiled is effectively improved; the production efficiency and the product percent of pass are improved, and the method has good popularization value. The method is mainly used for manufacturing small household appliances, automobile structural parts and the like. Moreover, the application does not increase the production cost.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to an SPHC hot-rolled pickled plate without transverse crease defects and a production method thereof.
Background
Along with the adjustment of the yield and the product structure of the pickling line, the requirement of the market on the surface quality of the soft steel SPHC of the household appliance board is gradually improved, the requirement of customers on the surface quality of the pickling board is higher and higher, and the manufacturers of the household appliance industry have zero tolerance on the cross-folding printing. In order to meet the requirements of customers, the transverse crease defect needs to be solved urgently. In the conventional SPHC pickling strip steel hot rolling production, because the pinning effect of the Coriolis air mass formed by interstitial atoms on the slippage can generate a yield platform and the yield strength is low (usually about 200 MPa), the stress of the hot rolling strip steel is easy to exceed the yield platform in the subsequent uncoiling process to generate a transverse crease mark, so that the surface quality of the strip steel is seriously affected, and a plurality of quality complaints or objections are caused.
The patent on the hot-rolled pickled plate soft steel SPHC without transverse crease defects and the production method is less. For example: patent publication No. CN108160715B discloses a control method of hot-rolled low-carbon steel uncoiling transverse crease, comprising the following steps: step 1, detecting the diameter of a hot-rolled low-carbon steel coil to be uncoiled; step 2, calculating the reduction of the deep bending roll according to the diameter of the hot-rolled low-carbon steel coil measured in the step 1; and 3, pressing down the deep bending roll according to the reduction value of the deep bending roll calculated in the step 2, and uncoiling the hot-rolled low-carbon steel coil. This patent mainly reduces the probability that the cross-crease appeared through relying on the decoiling equipment, can not fundamentally avoid the production of cross-crease completely.
At present, the problem of cross-folding marks is not solved in the prior art on the premise of not increasing the production cost.
Disclosure of Invention
The invention aims to provide an SPHC hot-rolled pickled plate without transverse crease defects, which realizes the non-transverse crease defects on the surface of soft steel SPHC and meets the requirements of users of household appliance plates.
The invention also aims to provide a production method of the SPHC hot-rolled pickled plate without the transverse crease defects, and the hot-rolled pickled SPHC without the transverse crease defects with good surface quality is produced through reasonable chemical component design, rolling process and pickling process.
The specific technical scheme of the invention is as follows:
the invention provides a production method of an SPHC hot-rolled pickled plate without transverse crease defects, which comprises the following steps: converter smelting, RH furnace refining, continuous casting, heating, rolling, cooling, coiling and acid washing.
The heating is as follows: the heating temperature is 1200-1250 ℃, and the furnace time is not more than 210 min.
Removing phosphorus by high-pressure water after heating; and 4, all the phosphorus removal equipment is put into use.
And (3) rolling: the initial rolling temperature of rough rolling is 1100-; the initial rolling temperature of the finish rolling is 930-1080 ℃, and the final rolling temperature is 880-920 ℃.
And (3) cooling: adopting front-section cooling, and cooling the rolled steel plate at a cooling speed of less than or equal to 40 ℃/second.
And (3) coiling: the coiling temperature is 580-620 ℃, and the air cooling is carried out to the room temperature after coiling.
In the design of a hot rolling process, the heating temperature is controlled to be less than or equal to 1250 ℃, the main purpose is to take account of the generation amount and energy consumption of surface iron scale, the heating temperature is too high, the amount of the generated primary iron scale is more, the removal difficulty of the iron scale is increased, and the improvement of the surface quality of the strip steel is not facilitated; removing scales by high-pressure water, and completely using a dephosphorization device to remove primary and secondary iron scales on the surface of the steel strip, thereby providing favorable conditions for acid washing; the final rolling temperature is controlled to be less than or equal to 920 ℃, the load of each stand for finish rolling is favorably reduced, the rolling stability is improved, simultaneously, the steel billet is ensured to rapidly enter a ferrite phase region after being rolled to separate out partial ferrite, a front-stage cooling process is adopted after rolling, the water cooling speed is less than or equal to 40 ℃/s, the coiling temperature is less than or equal to 620 ℃, and the purpose is to enable the material to rapidly enter a ferrite phase transition region to obtain a ferrite structure with a certain proportion.
The acid bath concentration of the acid bath of the 1-3# acid bath is less than or equal to 165 g/L.
Furthermore, in acid cleaning, the elongation of the withdrawal and straightening machine is less than or equal to 2.2 percent;
further, in acid washing, the pressure of the crease-resist roller is more than or equal to 15 percent.
In the design of the pickling process, the elongation of the tension leveler is less than or equal to 2.2 percent, and the large tension leveler elongation can increase the scale breaking effect and provide favorable conditions for pickling; the pressure of the crease-resist roller is more than or equal to 15 percent, and the method aims to eliminate the yield platform of the strip steel, reduce the work hardening and eliminate the light defects of the surface part of the strip steel.
The invention provides an SPHC hot-rolled pickled plate without transverse crease defects, which is produced by adopting the production method and comprises the following components in percentage by mass: less than or equal to 0.10 percent of C, less than or equal to 0.05 percent of Si, less than or equal to 0.60 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, and the balance of Fe and inevitable impurities.
Preferably, the SPHC hot-rolled pickled plate without the transverse crease defects comprises the following components in percentage by mass: 0.05 to 0.10 percent of C, less than or equal to 0.035 percent of Si, 0.40 to 0.60 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, and the balance of Fe and inevitable impurities.
The invention adopts a C-Mn component system in component design, and strictly controls the content of P, S and other impurity elements. C. Mn is used as a basic element in steel, plays a very important role in improving the yield strength of the steel, and in order to obtain good plasticity and extensibility, the content of C must be ensured to be below 0.10 percent, if the content of C is too high, ferrite with required quantity is difficult to obtain in the cooling process after hot rolling, so that the steel has poor plasticity; mn is used as a strengthening element of steel, the strength and the hardenability of the steel can be improved, the Mn content is controlled to be more than 0.4 percent, but the Mn content cannot be too high, the casting blank segregation probability is increased along with the increase of the Mn content, and the required amount of ferrite is not easy to form after rolling, thereby having adverse effect on the forming performance of the steel; si not only can play a role in solid solution strengthening, increases the strength of steel, but also can promote ferrite formation, expand the process window of ferrite formation and purify ferrite, but the content of Si is not too high, and red iron oxide scales are easily generated on the surface of the steel due to too high content of Si, and the iron oxide scales have strong structural adhesiveness and cannot be removed after acid pickling, so that the surface quality of a product is seriously influenced; p, S as the impurity element adversely affects the formability of the steel and should be controlled strictly, the lower the content, the better.
The hot rolled steel plate with the thickness specification of 1.6-6.0mm produced by the method has a microstructure of ferrite and pearlite, wherein the volume fraction of the ferrite is 92-96%, the volume fraction of the pearlite is 4-8%, the yield strength of the product is 250-320MPa, the tensile strength is more than 390MPa, the elongation A50 is 40-48%, the product is qualified when the 180-degree longitudinal bending test D is 0a, and the surface of the strip steel has no transverse crease defect.
Compared with the prior art, the invention can ensure that the common acid-washing carbon steel with less than or equal to 0.10 percent of C, less than or equal to 0.60 percent of Mn and less than or equal to 0.05 percent of Si obtains good surface quality by reasonably optimizing the component design, heating, hot rolling, cooling, coiling and acid washing processes, has no transverse crease on the surface of the strip steel, and effectively improves the product quality of the hot-rolled low-carbon steel after uncoiling; the production efficiency and the product percent of pass are improved, and the method has good popularization value. The method is mainly used for manufacturing small household appliances, automobile structural parts and the like. Moreover, the application does not increase the production cost.
Drawings
FIG. 1 is the metallographic structure of the product of example 1;
FIG. 2 is a metallographic structure of the product of example 1 after enlargement;
FIG. 3 is a surface of the product of example 1, without cross-crease defects;
fig. 4 shows the surface of the product of comparative example 1, which has cross-crease defects.
Detailed Description
Example 1 to example 3
A production method of SPHC hot-rolled pickled plate without transverse crease defects comprises the following steps: converter smelting, RH furnace refining, continuous casting, heating, rolling, cooling, coiling and acid washing.
The heating is as follows: the heating temperature is 1200-1250 ℃, and the furnace time is not more than 210 min.
And (3) rolling: the initial rolling temperature of rough rolling is 1100-; the initial rolling temperature of the finish rolling is 930-1080 ℃, and the final rolling temperature is 880-920 ℃.
And (3) cooling: adopting front-section cooling, and cooling the rolled steel plate at a cooling speed of less than or equal to 40 ℃/second.
And (3) coiling: the coiling temperature is 580-620 ℃, and the air cooling is carried out to the room temperature after coiling.
The acid pickling process includes pickling 1-3# acid tank with acid solution concentration not higher than 165 g/L, withdrawal and straightening machine elongation not higher than 2.2% and crease-resist roller pressure not lower than 15%.
The chemical compositions of molten steel in the SPHC hot-rolled pickled plate production process without crossmark defects described in examples 1 to 3 are shown in table 1, and the balance of Fe and inevitable impurity elements are not shown in table 1. Specific production process parameters of SPHC hot-rolled pickled plates without crossmark defects as described in examples 1-3 are shown in table 2.
Comparative examples 1 to 2
The production method of the SPHC hot-rolled pickled plate has the same process flow as that of the working example, the difference is the components and the process parameters of the steel in the specific production process, the chemical components of the molten steel of comparative examples 1-2 are shown in the table 1, and the balance of Fe and inevitable impurity elements which are not listed in the table 1. The specific production process parameters of the hot-rolled pickled plate of comparative example 1-comparative example 2 are shown in table 2.
TABLE 1 chemical composition (wt%) of examples and comparative examples
| Numbering | C | Si | Mn | P | S |
| Example 1 | 0.062 | 0.012 | 0.45 | 0.013 | 0.006 |
| Example 2 | 0.060 | 0.011 | 0.48 | 0.009 | 0.008 |
| Example 3 | 0.063 | 0.010 | 0.50 | 0.011 | 0.007 |
| Comparative example 1 | 0.005 | 0.030 | 0.55 | 0.034 | 0.010 |
| Comparative example 2 | 0.058 | 0.008 | 0.30 | 0.012 | 0.019 |
The hot rolling and pickling process parameters of the steel coil are shown in table 2.
TABLE 2 Process parameters for the examples and comparative examples
The mechanical properties and surface quality of the steel coils of the examples and comparative examples are shown in Table 3.
TABLE 3 Properties and surface qualities of the examples and comparative examples
As can be seen from the above examples, the hot-rolled pickled sheet mild steel SPHC has a microstructure of ferrite and pearlite, wherein the volume fraction of the ferrite is 92-96%, the volume fraction of the pearlite is 4-8%, the yield strength of the product is 250-320MPa, the tensile strength is more than 390MPa, the elongation A50 is 40-48%, the 180 DEG longitudinal bending test D is 0a qualified, and the strip steel surface has no transverse crease defect.
The above description is only for specific exemplary description of the present invention, and it should be noted that the specific implementation of the present invention is not limited by the above manner, and it is within the protection scope of the present invention as long as various insubstantial modifications are made by using the technical idea and technical solution of the present invention, or the technical idea and technical solution of the present invention are directly applied to other occasions without modifications.
Claims (10)
1. A production method of SPHC hot-rolled pickled plate without transverse crease defects comprises the following steps: converter smelting, RH furnace refining, continuous casting, heating, rolling, cooling, coiling and acid washing, and is characterized in that the pressure of a crease-resist roller is more than or equal to 15 percent in the acid washing.
2. The production method as claimed in claim 1, wherein the elongation of the withdrawal and straightening unit is not more than 2.2% during the pickling process.
3. The production method according to claim 1, wherein the acid pickling is carried out in a 1-3# acid tank acid solution concentration of 165 g/L or less.
4. The production method according to claim 1, wherein the heating: the heating temperature is 1200-1250 ℃, and the furnace time is not more than 210 min.
5. The production method according to claim 1, characterized in that the rolling: the initial rolling temperature of rough rolling is 1100-; the initial rolling temperature of the finish rolling is 930-1080 ℃, and the final rolling temperature is 880-920 ℃.
6. The production method according to claim 1, wherein the cooling: adopting front-section cooling, and cooling the rolled steel plate at a cooling speed of less than or equal to 40 ℃/second.
7. The production method according to claim 1, wherein the coiling: the coiling temperature is 580-620 ℃, and the air cooling is carried out to the room temperature after coiling.
8. The SPHC hot-rolled pickled plate without the transverse crease mark defects, which is produced by the production method of any one of claims 1 to 7, is characterized by comprising the following components in percentage by mass: less than or equal to 0.10 percent of C, less than or equal to 0.05 percent of Si, less than or equal to 0.60 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, and the balance of Fe and inevitable impurities.
9. The SPHC hot-rolled pickled plate without the transverse crease defects according to claim 8, which comprises the following components in percentage by mass: 0.05 to 0.10 percent of C, less than or equal to 0.035 percent of Si, 0.40 to 0.60 percent of Mn0.020 percent of P, less than or equal to 0.010 percent of S, and the balance of Fe and inevitable impurities.
10. The SPHC hot-rolled pickled plate without the transverse crease defects according to claim 8 or 9, wherein the microstructure of the SPHC hot-rolled pickled plate without the transverse crease defects is ferrite + pearlite, wherein the volume fraction of ferrite is 92-96% and the volume fraction of pearlite is 4-8%.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112191683A (en) * | 2020-08-28 | 2021-01-08 | 首钢京唐钢铁联合有限责任公司 | Cooling method for hot rolled steel coil after rolling |
| CN112501489A (en) * | 2020-10-31 | 2021-03-16 | 日照宝华新材料有限公司 | Production method of 300 MPa-grade low-carbon hot rolled steel without transverse fracture defect |
| CN112725694A (en) * | 2020-12-18 | 2021-04-30 | 本钢板材股份有限公司 | Hot-rolled pickled steel coil for improving flattening performance of welded pipe after cold drawing and production method thereof |
| CN113025909A (en) * | 2021-03-09 | 2021-06-25 | 马鞍山钢铁股份有限公司 | Hot-rolled pickled plate for refrigerator compressor shell and production method thereof |
| CN114160576A (en) * | 2021-11-15 | 2022-03-11 | 山东钢铁集团日照有限公司 | Control method for transverse crease of structural low-carbon steel hot-rolled commodity coil |
| CN115747666A (en) * | 2023-01-10 | 2023-03-07 | 山西建龙实业有限公司 | Low-carbon hot-rolled pickled steel and control method for transverse crease mark defects of steel strip of low-carbon hot-rolled pickled steel |
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| CN105297052A (en) * | 2014-06-12 | 2016-02-03 | 上海梅山钢铁股份有限公司 | Pickling line anti-wrinkling roller control method |
| CN110747323A (en) * | 2019-10-24 | 2020-02-04 | 马鞍山钢铁股份有限公司 | Acid-washing cold-formed steel and manufacturing method thereof |
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| CN105297052A (en) * | 2014-06-12 | 2016-02-03 | 上海梅山钢铁股份有限公司 | Pickling line anti-wrinkling roller control method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112191683A (en) * | 2020-08-28 | 2021-01-08 | 首钢京唐钢铁联合有限责任公司 | Cooling method for hot rolled steel coil after rolling |
| CN112191683B (en) * | 2020-08-28 | 2023-02-17 | 首钢京唐钢铁联合有限责任公司 | Cooling method for hot rolled steel coil after rolling |
| CN112501489A (en) * | 2020-10-31 | 2021-03-16 | 日照宝华新材料有限公司 | Production method of 300 MPa-grade low-carbon hot rolled steel without transverse fracture defect |
| CN112501489B (en) * | 2020-10-31 | 2022-05-13 | 日照宝华新材料有限公司 | Production method of 300 MPa-grade low-carbon hot rolled steel without transverse fracture defect |
| CN114645195A (en) * | 2020-10-31 | 2022-06-21 | 日照宝华新材料有限公司 | Hot-rolled pickled sheet band without transverse crease defect |
| CN114645195B (en) * | 2020-10-31 | 2023-01-31 | 日照宝华新材料有限公司 | Hot-rolled pickled sheet band without transverse crease defect |
| CN112725694A (en) * | 2020-12-18 | 2021-04-30 | 本钢板材股份有限公司 | Hot-rolled pickled steel coil for improving flattening performance of welded pipe after cold drawing and production method thereof |
| CN113025909A (en) * | 2021-03-09 | 2021-06-25 | 马鞍山钢铁股份有限公司 | Hot-rolled pickled plate for refrigerator compressor shell and production method thereof |
| CN114160576A (en) * | 2021-11-15 | 2022-03-11 | 山东钢铁集团日照有限公司 | Control method for transverse crease of structural low-carbon steel hot-rolled commodity coil |
| CN114160576B (en) * | 2021-11-15 | 2023-09-15 | 山东钢铁集团日照有限公司 | Control method for transverse fold lines of low-carbon steel hot rolled commodity coil for structure |
| CN115747666A (en) * | 2023-01-10 | 2023-03-07 | 山西建龙实业有限公司 | Low-carbon hot-rolled pickled steel and control method for transverse crease mark defects of steel strip of low-carbon hot-rolled pickled steel |
| CN115747666B (en) * | 2023-01-10 | 2023-06-23 | 山西建龙实业有限公司 | Low-carbon hot-rolled pickled steel and control method for transverse crease defect of steel strip thereof |
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Application publication date: 20200717 |