CN111206146A - Preparation process of high-corrosion-resistance low-carbon steel - Google Patents
Preparation process of high-corrosion-resistance low-carbon steel Download PDFInfo
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- CN111206146A CN111206146A CN202010123433.1A CN202010123433A CN111206146A CN 111206146 A CN111206146 A CN 111206146A CN 202010123433 A CN202010123433 A CN 202010123433A CN 111206146 A CN111206146 A CN 111206146A
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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
- C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/04—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering with simultaneous application of supersonic waves, magnetic or electric fields
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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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
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
- C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
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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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Abstract
The invention relates to the technical field of material preparation, in particular to a preparation process of high-corrosion-resistance low-carbon steel. The process of the invention ensures that the corrosion rate of the final low-carbon steel in the acetic acid solution with the pH value of 3.0 and the concentration of 0.056mol/L reaches the optimum, and the average reduction of the corrosion rate is 11.45 percent.
Description
Technical Field
The invention relates to the technical field of material preparation, in particular to a preparation process of high-corrosion-resistance low-carbon steel.
Background
The low-carbon steel mainly comprises Fe and C elements, is usually subjected to heat treatment to obtain tempered low-carbon martensite, pearlite or ferrite and cementite structures, has yield strength of 300-1200 MPa, and is widely applied to the fields of ships, bridges, vehicles, boilers and the like.
The corrosion damage is a common damage form of low-carbon steel materials in the using process, can cause huge direct loss to the low-carbon steel, and is an important problem to be solved urgently in the material science. The cause of corrosion is the chemical and electrochemical reaction of low carbon steel materials with environmental media (such as water, steam, air, gas, coal gas, and the like). The improvement of the corrosion resistance of the low-carbon steel material is beneficial to prolonging the service life of a structure made of the low-carbon steel, thereby achieving the purposes of saving energy and fully exerting the potential of the low-carbon steel material.
At present, some studies on the improvement of the corrosion resistance of a low-carbon steel welded joint have been conducted by researchers, but studies on the improvement of the corrosion resistance of the whole low-carbon steel material have not been reported. Therefore, it is necessary to search for improvement in corrosion resistance of the entire low carbon steel material.
Disclosure of Invention
The invention aims to overcome the technical problems and provides a preparation process of high-corrosion-resistance low-carbon steel, which effectively improves the corrosion resistance of the low-carbon steel material while ensuring the inherent plasticity and toughness of the low-carbon steel, can prolong the service life of the low-carbon steel material structure, and achieves the purposes of saving energy and fully exerting the potential of the low-carbon steel material.
The technical scheme for solving the technical problems is as follows:
a preparation process of high-corrosion-resistance low-carbon steel comprises the steps of adding a magnetic treatment working section after a low-carbon steel slab smelting working section is completed to obtain a magnetic treatment slab, rolling the magnetic treatment slab, carrying out a continuous annealing process on the rolled slab to obtain a low-carbon steel semi-finished product, and carrying out a laser impact process on the surface of the low-carbon steel semi-finished product to obtain the high-corrosion-resistance low-carbon steel.
Further, the low-carbon steel comprises the following components in percentage by mass: 0.06-0.22% of carbon, 0.04-0.09% of silicon, 0.05-0.45% of manganese, 0.03-0.05% of phosphorus, 0.01-0.03% of sulfur and the balance of iron.
Furthermore, the magnetic field direction of the magnetic treatment section is parallel to the surface of the plate blank to be magnetically treated.
In the magnetic treatment section, a low-frequency intermittent magnetic field is adopted for treatment, the frequency of the magnetic field of each square plate blank is 3.0-5.5Hz, and the treatment time is 8-15 min.
The magnetic treatment device comprises a special magnetic treatment power supply and a magnetic yoke, the magnetic yoke is connected with the special magnetic treatment power supply through a coil, the coil is wound on the magnetic yoke, and two ends of the coil are respectively connected with the positive electrode and the negative electrode of the special magnetic treatment power supply.
Further, the magnetic yoke is a U-shaped magnetic yoke.
More specifically, the laser shock process parameters are 10-20ns of laser pulse width, 3-5mm of spot diameter and 8-18J of shock energy.
The invention has the beneficial effects that:
the invention provides a preparation process of high corrosion-resistant low-carbon steel, which is characterized in that a magnetic treatment working section is added after a low-carbon steel slab smelting working section is completed, namely the magnetic treatment working section is added before a rolling working section, the corrosion resistance of a low-carbon steel slab is improved under the action of a magnetic field, and the corrosion resistance of the low-carbon steel is optimized by optimizing the technological parameters and the form of the magnetic field, so that the service life of the low-carbon steel is prolonged. And then the surface of the low-carbon steel semi-finished product is combined to carry out a laser shock process, so that the corrosion rate of the final low-carbon steel in an acetic acid solution with the pH value of 3.0 and the concentration of 0.056mol/L reaches the optimum, and the average reduction of the corrosion rate is 11.45%.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic view of a magnetic treatment apparatus according to the present invention;
in the figure, 1 is a yoke, 2 is a power supply dedicated to magnetic processing, and 3 is a coil.
Detailed Description
Example 1:
as shown in figure 1, the preparation process of the high corrosion-resistant low carbon steel comprises the steps of adding a magnetic treatment working section after a low carbon steel slab smelting working section is completed to obtain a magnetic treatment slab, then rolling the magnetic treatment slab, carrying out a continuous annealing process on the rolled slab to obtain a low carbon steel semi-finished product, and then carrying out a laser shock process on the surface of the low carbon steel semi-finished product to obtain the high corrosion-resistant low carbon steel.
The low-carbon steel comprises the following components in percentage by mass: 0.22% of carbon, 0.04% of silicon, 0.45% of manganese, 0.03% of phosphorus, 0.01% of sulfur and the balance of iron.
The magnetic field direction of the magnetic treatment section is parallel to the surface of the plate blank to be magnetically treated.
In the magnetic treatment section, a low-frequency intermittent magnetic field is adopted for treatment, the frequency of the magnetic field of each square plate blank is 5.5Hz, and the treatment time is 8 min.
The magnetic treatment working section is to carry out magnetic treatment on the surface of the plate blank by adopting a magnetic treatment device, the magnetic treatment device comprises a special magnetic treatment power supply and a U-shaped magnetic yoke, the U-shaped magnetic yoke and the special magnetic treatment power supply are connected through a coil, the coil is wound on the magnetic yoke, and two ends of the coil are respectively connected with the positive electrode and the negative electrode of the special magnetic treatment power supply.
The laser shock process parameters are 10ns of laser pulse width, 5mm of spot diameter and 18J of shock energy.
Example 2:
a preparation process of high-corrosion-resistance low-carbon steel comprises the steps of adding a magnetic treatment working section after a low-carbon steel slab smelting working section is completed to obtain a magnetic treatment slab, rolling the magnetic treatment slab, carrying out a continuous annealing process on the rolled slab to obtain a low-carbon steel semi-finished product, and carrying out a laser impact process on the surface of the low-carbon steel semi-finished product to obtain the high-corrosion-resistance low-carbon steel.
The low-carbon steel comprises the following components in percentage by mass: 0.06% of carbon, 0.09% of silicon, 0.05% of manganese, 0.05% of phosphorus, 0.03% of sulfur and the balance of iron.
The magnetic field direction of the magnetic treatment section is parallel to the surface of the plate blank to be magnetically treated.
In the magnetic treatment section, a low-frequency intermittent magnetic field is adopted for treatment, the frequency of the magnetic field of each square plate blank is 3.0Hz, and the treatment time is 15 min.
The magnetic treatment working section is to perform magnetic treatment on the surface of the plate blank by adopting a magnetic treatment device, the magnetic treatment device comprises a special magnetic treatment power supply and a magnetic yoke, the magnetic yoke is connected with the special magnetic treatment power supply through a coil, the coil is wound on the magnetic yoke, and two ends of the coil are respectively connected with the positive electrode and the negative electrode of the special magnetic treatment power supply.
The laser shock process parameters are laser pulse width 20ns, light spot diameter 3mm and shock energy 8J.
Example 3:
a preparation process of high-corrosion-resistance low-carbon steel comprises the steps of adding a magnetic treatment working section after a low-carbon steel slab smelting working section is completed to obtain a magnetic treatment slab, rolling the magnetic treatment slab, carrying out a continuous annealing process on the rolled slab to obtain a low-carbon steel semi-finished product, and carrying out a laser impact process on the surface of the low-carbon steel semi-finished product to obtain the high-corrosion-resistance low-carbon steel.
The low-carbon steel comprises the following components in percentage by mass: 0.18% of carbon, 0.06% of silicon, 0.3% of manganese, 0.04% of phosphorus, 0.02% of sulfur and the balance of iron.
The magnetic field direction of the magnetic treatment section is parallel to the surface of the plate blank to be magnetically treated.
In the magnetic treatment section, a low-frequency intermittent magnetic field is adopted for treatment, the frequency of the magnetic field of each square plate blank is 4Hz, and the treatment time is 12 min.
The magnetic treatment working section is to perform magnetic treatment on the surface of the plate blank by adopting a magnetic treatment device, the magnetic treatment device comprises a special magnetic treatment power supply and a magnetic yoke, the magnetic yoke is connected with the special magnetic treatment power supply through a coil, the coil is wound on the magnetic yoke, and two ends of the coil are respectively connected with the positive electrode and the negative electrode of the special magnetic treatment power supply.
The laser shock process parameters are laser pulse width 15ns, spot diameter 4mm and shock energy 12J.
Comparative example 1:
the method is different from the embodiment 1 in that a magnetic treatment working section is added after a low-carbon steel slab smelting working section is completed to obtain a magnetic treatment slab, then the magnetic treatment slab is rolled, and the rolled slab is subjected to a continuous annealing process to obtain low-carbon steel.
Comparative example 2:
the difference from the embodiment 1 is that a magnetic treatment working section is not added after the low-carbon steel slab smelting working section is completed, and a laser shock process does not exist after the annealing process.
And (3) corrosion test:
and the corrosion medium adopts an acetic acid solution with the pH value of 3.0 and the concentration of 0.056mol/L to carry out a full immersion corrosion test on the low carbon steel sample to be tested. Before a corrosion test, the surface of a low-carbon steel sample is polished to 150 meshes by using sand paper, no obvious scratch is generated on the surface, the surface area of the sample is measured, then the surface of the sample is cleaned and dried, and the sample is weighed by using a balance with the precision of 0.01 g. The corrosion test is carried out at room temperature, each sample is respectively soaked in a respective container, and sufficient acetic acid solution can ensure that the pH value of the sample is almost kept unchanged in the corrosion test process. The corrosion test was carried out for 72 hours under the same conditions.
After the corrosion test is finished, taking out the sample, washing away corrosion products on the surface, drying, weighing, comparing the mass change of the sample before and after the corrosion test, and calculating the corrosion efficiency of the sample in a corrosion medium according to the following formula ①:
①
wherein v is a corrosion rate (mm/a);
m0the mass (g) of the sample before the corrosion test;
m1the mass (g) of the sample after the corrosion test;
s is the total area (cm) of the sample2)；
t is the time (h) of the corrosion test;
ρ is the density of the sample (g/cm)3) The value is 7.8g/cm3。
The test results obtained, calculated according to formula ①, are shown in table 1 below:
TABLE 1 results of testing the influence of the Corrosion Performance on the Low carbon Steel samples of examples 1 to 3 and comparative examples 1 to 2
As can be seen from table 1 above, the average corrosion rate of the samples of examples 1 to 3 is 0.7084mm/a, the corrosion rate of comparative example 1 is 0.8001, and the corrosion efficiency is not much different from that of comparative example 2, and then the average reduction in corrosion rate of the low carbon steel prepared by the method of the present invention is (0.80-0.7084)/0.80-11.45% with reference to the average corrosion rates of comparative example 1 and comparative example 2.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiment according to the present invention are within the scope of the present invention.
Claims (7)
1. A preparation process of high-corrosion-resistance low-carbon steel is characterized in that a magnetic treatment working section is added after a low-carbon steel slab smelting working section is completed to obtain a magnetic treatment slab, the magnetic treatment slab is rolled, the rolled slab is subjected to a continuous annealing process to obtain a low-carbon steel semi-finished product, and the surface of the low-carbon steel semi-finished product is subjected to a laser shock process to obtain the high-corrosion-resistance low-carbon steel.
2. The process for preparing the high corrosion-resistant low carbon steel according to claim 1, wherein the low carbon steel consists of the following components in percentage by mass: 0.06-0.22% of carbon, 0.04-0.09% of silicon, 0.05-0.45% of manganese, 0.03-0.05% of phosphorus, 0.01-0.03% of sulfur and the balance of iron.
3. The process for preparing the high corrosion-resistant low carbon steel according to claim 1, wherein the magnetic field direction of the magnetic treatment section is parallel to the surface of the slab to be magnetically treated.
4. The process for preparing the high corrosion-resistant low carbon steel according to claim 1, wherein in the magnetic treatment section, a low-frequency intermittent magnetic field is adopted for treatment, the frequency of the magnetic field per square plate blank is 3.0-5.5Hz, and the treatment time is 8-15 min.
5. The process for preparing the high corrosion-resistant low carbon steel according to claim 1, wherein the magnetic treatment section is to perform magnetic treatment on the surface of the slab by using a magnetic treatment device, the magnetic treatment device comprises a magnetic treatment special power supply and a magnetic yoke, the magnetic yoke is connected with the magnetic treatment special power supply through a coil, the coil is wound on the magnetic yoke, and two ends of the coil are respectively connected with the positive electrode and the negative electrode of the magnetic treatment special power supply.
6. The process for preparing the high corrosion resistance low carbon steel according to claim 5, wherein the magnetic yoke is a U-shaped magnetic yoke.
7. The process for preparing the high corrosion resistance low carbon steel according to claim 1, wherein the laser shock process parameters are laser pulse width 10-20ns, spot diameter 3-5mm and shock energy 8-18J.
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| CN202010123433.1A CN111206146A (en) | 2020-02-27 | 2020-02-27 | Preparation process of high-corrosion-resistance low-carbon steel |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08283898A (en) * | 1995-04-12 | 1996-10-29 | Nippon Steel Corp | Multi-layered steel sheet excellent in corrosion resistance, weldability, and fatigue characteristic and its production |
| CN1600904A (en) * | 2003-09-24 | 2005-03-30 | 湘潭大学 | Mickel coated steel strap for deep drawing and preparation method |
| CN103924060A (en) * | 2014-04-11 | 2014-07-16 | 武汉理工大学 | Magnetic treatment method for controlling bearing assembly machining residual stress |
| CN110735020A (en) * | 2019-10-29 | 2020-01-31 | 深圳万佳互动科技有限公司 | Heat treatment method of low-carbon steel structural parts |
-
2020
- 2020-02-27 CN CN202010123433.1A patent/CN111206146A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08283898A (en) * | 1995-04-12 | 1996-10-29 | Nippon Steel Corp | Multi-layered steel sheet excellent in corrosion resistance, weldability, and fatigue characteristic and its production |
| CN1600904A (en) * | 2003-09-24 | 2005-03-30 | 湘潭大学 | Mickel coated steel strap for deep drawing and preparation method |
| CN103924060A (en) * | 2014-04-11 | 2014-07-16 | 武汉理工大学 | Magnetic treatment method for controlling bearing assembly machining residual stress |
| CN110735020A (en) * | 2019-10-29 | 2020-01-31 | 深圳万佳互动科技有限公司 | Heat treatment method of low-carbon steel structural parts |
Non-Patent Citations (3)
| Title |
|---|
| 华健 等: "《现代汽车制造工艺学》", 31 May 2012 * |
| 林健 等: "磁处理改善低碳钢焊接接头的耐腐蚀性能", 《焊接学报》 * |
| 胡洪林 等: "冷轧低碳冲压门板用钢的生产研发", 《新疆钢铁》 * |
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