阅读说明：本技术 一种应用于环保厨房用钢及其制备方法 (Steel applied to environment-friendly kitchen and preparation method thereof ) 是由 吴刚 文小明 韩宇 陈红远 薛文辉 徐勇 于 2020-03-24 设计创作，主要内容包括：本发明提供了一种应用于环保厨房用钢及其制备方法,其中,提高加热温度,缩短保温时间,实验室模拟试验结果显示,加热温度1200-1250℃,保温时间30分钟,保证了合金元素充分的融入和低碳钢在轧制时有较好的塑性以及良好的板型,满足轧制工艺要求,精轧压缩比3以上,改善成品的金相组织和物理性能,提高产品质量。中、低温卷取,获得细小均匀的组织和合适的氧化铁皮结构。这种钢材制造成本比铝锅、不锈钢锅节省1.5～3.0倍,应用于大酒点炒锅上,可满足技术性能要求,可降低原材料制造成本,提高相关产业经济效益,促进了环保行业发展和科学技术进步。同时可以节省大量不锈钢材、铝材等,减轻有色金属冶金造成的环境污染和能耗。(The invention provides an environment-friendly kitchen steel and a preparation method thereof, wherein the heating temperature is increased, the heat preservation time is shortened, and laboratory simulation test results show that the heating temperature is 1200-. And coiling at medium and low temperature to obtain fine and uniform tissues and proper iron scale structures. The manufacturing cost of the steel is saved by 1.5-3.0 times compared with an aluminum pot and a stainless steel pot, and the steel can meet the technical performance requirement when being applied to a large-wine-point frying pot, can reduce the manufacturing cost of raw materials, improves the economic benefit of related industries, and promotes the development of the environmental protection industry and the scientific and technical progress. Meanwhile, a large amount of stainless steel, aluminum materials and the like can be saved, and the environmental pollution and energy consumption caused by non-ferrous metallurgy are reduced.)

1. The steel applied to the environment-friendly kitchen is characterized by comprising the following chemical components in percentage by mass: c: 0.005-0.08%, Si: 0.01-0.05%, Mn: 0.10-0.40%, S: 0.001-0.008%, P: 0.003-0.015%, Al: 0.015 to 0.06%, Ni: 0.001-0.10%, Cr: 0.03-0.20%, Ca: 0.0005-0.0060%, N: 0.0010-0.0060% and the balance of Fe and other inevitable impurities.

2. The preparation method of the steel for the environment-friendly kitchen according to claim 1, comprising the steps of:

1) pre-desulphurisation of molten iron

Heavy scrap steel is adopted, the slag is required to be removed completely, and S in molten iron fed into a furnace is less than or equal to 0.003 percent;

2) converter steelmaking

The converter draws carbon for one time, and avoids point blowing; tapping adopts high manganese and ferrosilicon; argon purging is carried out on a steel ladle before tapping, a tapping hole is controlled, the flow scattering is avoided, and steel ladle Als is controlled according to 0.010-0.055%; the N content of the steel ladle is required to be less than or equal to 30 ppm;

3) refining procedure

The RH process is adopted, the gas content in steel is strictly controlled, and calcium silicate wire calcium treatment is adopted, so that inclusions are fully spheroidized, and the product performance is improved;

4) continuous casting procedure

Before casting, argon is adopted to purge the tundish, protective casting is carried out in the whole process, no molten steel is exposed in the casting process, the water mouth is strictly controlled to absorb N, and the increase of N is controlled to be less than or equal to 4 ppm; the slag is wrapped in the high alkalinity, which is beneficial to removing the impurities in the steel; the soft reduction function is put into the steel casting process; the constant drawing speed is kept in the steel casting process; the control target of the superheat degree of continuous casting is not more than 25 ℃. Hot overheating and loading the plate blanks, and placing the rest plate blanks in a slow cooling area in a warehouse;

5) heating furnace section

The heating temperature is 1200-1250 ℃, the target tapping temperature is 1220-1250 ℃, the furnace chamber atmosphere of the heating furnace is controlled, the generation of casting blank iron scale is reduced, the uniform heating temperature is ensured, and a foundation is provided for ensuring the plate shape;

6) rolling and coiling part

Selecting a 3+3 mode for control in the rough rolling pass; load distribution of a finish rolling model is well done, and rolling stability is guaranteed; the finishing temperature is as follows: not less than 850; coiling temperature: 550 and 650. the cooling mode adopts a sixth-group cooling and front-section cooling mode. The accurate control of the finish rolling and coiling temperature is ensured; and optimizing and adjusting the control of the cooling water amount between the racks according to the actual condition of the surface of the strip steel.

3. The environmentally friendly kitchen steel according to claim 2, wherein in step 3), the CaSi wire is fed for 450 m.

4. The environmentally friendly kitchen steel according to claim 2, wherein the step 6) further comprises the step of performing small scale removal after F1 and F2.

Technical Field

The invention relates to the field of steel manufacturing, in particular to environment-friendly kitchen steel and a preparation method thereof.

Background

Generally, a frying pan used in modern families comprises a non-stick pan, a stainless steel pan, an aluminum alloy pan, an iron pan and the like, when acid, alkaline or more salty food is cooked in the aluminum alloy pan, aluminum in the pan can be dissolved out to pollute the food, and the aluminum alloy pan is not good for human health; the stainless steel pot body is heavy and has uneven heat conduction; the non-stick pan can not be scraped by an iron shovel and a consolidation object and can not be cleaned by a steel wire ball, and if the coating is seriously damaged, the non-stick pan can not be used any more.

In the past, when a frying pan is manufactured, the cost of adopted galvanized and stainless steel raw materials is 2-3 times that of common carbon steel under the common condition, the frying pan manufacturing cost rises while the practicability and uniformity of the frying pan are solved, the production profit is reduced, particularly, the market competition at home and abroad is very fierce at present, the enterprise profit is greatly compressed, the survival crisis is faced in many times, and the research and development of a substitute material capable of meeting the actual production manufacturing and performance requirements of the environment-friendly kitchen steel are urgently needed, so that the production cost of the enterprise is reduced.

Disclosure of Invention

In order to solve the problems, the invention provides steel applied to an environment-friendly kitchen and a preparation method thereof.

The invention provides an environment-friendly kitchen steel, which comprises the following chemical components in percentage by mass: c: 0.005-0.08%, Si: 0.01-0.05%, Mn: 0.10-0.40%, S: 0.001-0.008%, P: 0.003-0.015%, Al: 0.015 to 0.06%, Ni: 0.001-0.10%, Cr: 0.03-0.20%, Ca: 0.0005-0.0060%, N: 0.0010-0.0060% and the balance of Fe and other inevitable impurities.

The invention also provides a preparation method of the environment-friendly kitchen steel, which comprises the following steps:

1) pre-desulphurisation of molten iron

Heavy scrap steel is adopted, the slag is required to be removed completely, and S in molten iron fed into a furnace is less than or equal to 0.003 percent;

2) converter steelmaking

The converter draws carbon for one time, and avoids point blowing; tapping adopts high manganese and ferrosilicon; argon purging is carried out on a steel ladle before tapping, a tapping hole is controlled, the flow scattering is avoided, and steel ladle Als is controlled according to 0.010-0.055%; the N content of the steel ladle is required to be less than or equal to 30 ppm;

3) refining procedure

The RH process is adopted, the gas content in steel is strictly controlled, and calcium silicate wire calcium treatment is adopted, so that inclusions are fully spheroidized, and the product performance is improved;

4) continuous casting procedure

Before casting, argon is adopted to purge the tundish, protective casting is carried out in the whole process, no molten steel is exposed in the casting process, the water mouth is strictly controlled to absorb N, and the increase of N is controlled to be less than or equal to 4 ppm; the slag is wrapped in the high alkalinity, which is beneficial to removing the impurities in the steel; the soft reduction function is put into the steel casting process; the constant drawing speed is kept in the steel casting process; the control target of the superheat degree of continuous casting is not more than 25 ℃. Hot overheating and loading the plate blanks, and placing the rest plate blanks in a slow cooling area in a warehouse;

5) heating furnace section

The heating temperature is 1200-1250 ℃, the target tapping temperature is 1220-1250 ℃, the furnace chamber atmosphere of the heating furnace is controlled, the generation of casting blank iron scale is reduced, the uniform heating temperature is ensured, and a foundation is provided for ensuring the plate shape;

6) rolling and coiling part

Selecting a 3+3 mode for control in the rough rolling pass; load distribution of a finish rolling model is well done, and rolling stability is guaranteed; the finishing temperature is as follows: not less than 850; coiling temperature: 550 and 650. the cooling mode adopts a sixth-group cooling and front-section cooling mode. The accurate control of the finish rolling and coiling temperature is ensured; and optimizing and adjusting the control of the cooling water amount between the racks according to the actual condition of the surface of the strip steel.

Preferably, in the step 3), the CaSi wire is fed for 450 meters.

Further preferably, the step 6) further comprises the step of performing small scale removal after F1 and F2 machines.

The steel applied to the environment-friendly kitchen has good oxidation resistance and stripping resistance, wherein the alloy elements play a decisive role in the following steps:

(1) the adhesiveness of the iron scale is increased;

(2) the phase structure and the variety of the iron scale are influenced, and the growth of a rust layer is hindered;

(3) the anti-stripping capability of the steel plate is increased;

(4) the oxidation resistance of the steel plate is increased;

(5) the alloying elements and their compounds hinder the generation of cracks and defects.

The content ranges and functions of the chemical element components forming the steel are as follows:

c: 0.005 to 0.08%, C is an element for improving the strength of steel, and the content of C is required to be 0.005 wt% or more in order to achieve a steel strength equivalent to that of structural carbon steel, but if it exceeds 0.10 wt%, it is not preferable because it is detrimental to the spalling resistance of steel and affects the weldability, cold brittleness, cold stamping property, etc. of steel, and therefore, the content of C is preferably in the range of 0.005 to 0.08 wt%.

P: 0.003-0.015 wt% P is detrimental in general steels, high P content tends to cause cold shortness in steel, and P content exceeding 0.015 wt% in steel greatly lowers toughness, so that P content of 0.003-0.015 wt% is preferable.

Cr: 0.03-0.20 wt%. Cr can form a compact oxide film on the surface of steel, thereby improving the passivation capability of the steel, and in order to improve the adhesiveness of iron oxide scales, a proper amount of Cr is added into the steel, and in addition, the Cr improves the corrosion resistance of the steel. The preferable Cr content in the present invention is in the range of 0.03 to 0.20 wt%.

Ni: 0.001-0.10 wt%. Ni is a relatively stable element, the addition of Ni can improve the mechanical strength of steel, change the self-corrosion potential of steel to the positive direction, increase the stability of steel, and the addition of a proper amount of Ni in steel can also improve the adhesiveness of iron scales on the surface of steel and avoid the phenomenon of iron scale falling off in the cold forming process. The Ni content is preferably 0.001 to 0.10 wt% in the present invention.

Si: 0.01-0.05 wt%. Si is usually added as a deoxidizer to improve the strength of the steel material, and since Si content is low to improve cold formability of the steel material and toughness of the steel material, Si content of 0.01 to 0.05 wt% is preferable.

Ca: 0.0005-0.0060 wt%. The addition of a trace amount of Ca into the steel can improve the form of inclusions in the steel and avoid the harmful effect of long-strip-shaped inclusions on steel, and the addition of a trace amount of Ca into the steel can form CaO and CaS which are dissolved in a thin electrolyte film on the surface of the steel, so that the alkalinity of a corrosion interface is increased, the corrosivity of the corrosion interface is reduced, and a rust layer is promoted to be converted into a compact protective film with good protection. The Ca content of the present invention is preferably 0.0005 to 0.0060 wt%.

Mn: 0.10-0.40 wt%. Mn is one of indispensable elements in steel, and improves the corrosion resistance of steel to some extent, and an excessive amount of Mn reduces the toughness and weldability of steel, so the content is preferably 0.10-0.40 wt%.

S: the S content of 0.001-0.008 wt% is liable to play a hot-shortness role in steel and a harmful role in general steel, and is controlled to be 0.001-0.008 wt%.

Al: 0.015-0.060 wt%. Al is an element added in steel as a deoxidizer, a certain amount of aluminum is added into molten steel, aluminum and oxygen react to generate aluminum oxide under the condition of high temperature, the aluminum oxide floats on the surface of the molten steel in the form of residues, and then the residues are removed to control the oxygen content in the molten steel, thereby playing an important role in reducing impurities in the steel and improving the quality of the steel. The preferable content range is 0.015 to 0.060 wt%.

N: 0.0010-0.0060 Wt%. In smelting, adding N is beneficial to removing harmful gas impurities and mechanical impurities generated in steel smelting, improving the performance of steel and improving the quality of steel, and if the content of N is too high, the impact toughness of steel is influenced, and in addition, failure hardening is easily caused. Therefore, the N content is preferably 0.0010 to 0.0060 Wt%.

The balance consisting of Fe and other impurities.

The invention has the following beneficial effects:

(1) in the aspect of chemical composition design, the content of the added alloy is low, the steel quality is pure, and the cost is saved on the basis of ensuring excellent performance.

(2) The anti-oxidation iron sheet on the surface of the steel plate has the stripping performance, and the use requirement of a user is met.

(3) The mechanical property is small, various indexes meet the requirements, and the elongation after fracture is large.

(4) In the aspect of controlling the structure of the iron scale, the process is ensured by adopting measures such as reasonable higher heating temperature, proper finish rolling temperature, moderate temperature coiling temperature and the like, and the plate shape is excellent.

(5) The special steel for the frying pan produced by the process completely meets the use requirements of users through excellent performance and good iron scale structure and plate type.

(6) The special steel for the frying pan, which is produced by the technology, reduces the cost of enterprises, embodies higher finished product quality and yield and has good economic benefit.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The embodiment provides the environment-friendly kitchen steel which comprises the following chemical components in percentage by mass: c: 0.005-0.08%, Si: 0.01-0.05%, Mn: 0.10-0.40%, S: 0.001-0.008%, P: 0.003-0.015%, Al: 0.015 to 0.06%, Ni: 0.001-0.10%, Cr: 0.03-0.20%, Ca: 0.0005-0.0060%, N: 0.0010-0.0060% and the balance of Fe and other inevitable impurities.

The invention also provides a preparation method of the steel applied to the environment-friendly kitchen, which comprises the following steps:

1) pre-desulphurisation of molten iron

Heavy scrap steel is adopted, the slag is required to be removed completely, and S in molten iron fed into a furnace is less than or equal to 0.003 percent;

2) converter steelmaking

The converter draws carbon for one time, and avoids point blowing; tapping adopts high manganese and ferrosilicon; argon purging is carried out on a steel ladle before tapping, a tapping hole is controlled, the loose flow is avoided, the Als of the steel ladle is controlled according to 0.010-0.055%, and the N of the steel ladle is required to be less than or equal to 30 ppm;

3) refining procedure

The RH process is adopted, the gas content in steel is strictly controlled, calcium silicate wire calcium treatment is adopted, and CaSi wire 450 meters is fed, so that inclusions are fully spheroidized, and the product performance is improved;

4) continuous casting procedure

Before casting, argon is adopted to purge the tundish, protective casting is carried out in the whole process, no molten steel is exposed in the casting process, the water mouth is strictly controlled to absorb N, and the increase of N is controlled to be less than or equal to 4 ppm; the slag is wrapped in the high alkalinity, which is beneficial to removing the impurities in the steel; the soft reduction function is put into the steel casting process; the constant drawing speed is kept in the steel casting process; the control target of the superheat degree of continuous casting is not more than 25 ℃. Hot overheating and loading the plate blanks, and placing the rest plate blanks in a slow cooling area in a warehouse;

5) heating furnace section

The heating temperature is 1200-1250 ℃, the target tapping temperature is 1220-1250 ℃, the furnace chamber atmosphere of the heating furnace is controlled, the generation of casting blank iron scale is reduced, the uniform heating temperature is ensured, and a foundation is provided for ensuring the plate shape;

6) rolling and coiling part

Selecting a 3+3 mode for control in the rough rolling pass; load distribution of a finish rolling model is well done, and rolling stability is guaranteed; the finishing temperature is as follows: not less than 850; coiling temperature: 550 and 650. the cooling mode adopts a sixth-group cooling and front-section cooling mode. The accurate control of the finish rolling and coiling temperature is ensured; according to the actual condition of the surface of the strip steel, the small scale removal is carried out after the F1 machine and the F2 machine are selectively put into the strip steel, and the control of the cooling water quantity between the frames is optimized and adjusted.

The following performance tests were performed on the steels produced by the methods provided in the above examples and on steels produced by other processes, and the results are shown in table 1:

table 1 results of performance testing

Number plate	Yield strength Rt0.5	Tensile strength Rm	Elongation% A50
				N400MS	≤260	≤360	≥26
The process	230	320	42
				Other processes	331	425	32

And (4) conclusion: from experimental results of examples and comparative examples, the steel for environment-friendly kitchens provided by the application has better toughness and plasticity under the condition that the strength of the product meets the standard and sufficient margin is provided.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.