WO2024136120A1 - Ferritic stainless steel with improved workability and ridging resistance and manufacturing method thereof - Google Patents

Abstract

The present invention pertains to a ferritic stainless steel with improved workability and ridging resistance, and a manufacturing method thereof. A ferritic stainless steel with improved workability and ridging resistance according to an embodiment of the present invention contains, in wt%, 0.0005-0.02% of carbon (C), 0.01-0.2% of nitrogen (N), 0.01-1.0% of silicon (Si), 0.01-1.0% of manganese (Mn), 0.001-0.05% of phosphorus (P), 13.0-20.0% of chromium (Cr), and 0.05-0.2% of titanium (Ti), with the remainder comprising iron (Fe) and inevitable impurities, satisfies expression (1), and may have a grain size of 20 to 25 µm. Expression (1): 2*[Ti]/[N] ≤ 2.3 In expression (1), [Ti] and [N] refer to the content (in wt%) of the respective elements.

Description

Ferritic stainless steel with improved machinability and anti-scratch properties and manufacturing method thereof

The present invention relates to a ferritic stainless steel with improved processability and anti-scratch properties and a method of manufacturing the same.

Ferritic stainless steel has excellent corrosion resistance while adding a small amount of expensive alloy elements, making it more cost-competitive than austenitic stainless steel. Ferritic stainless steels are used in building materials, transportation equipment, home appliances, and kitchen appliances.

Ferritic stainless steel cold-rolled products have a problem in that stripe-shaped ridging defects occur during forming processing such as deep drawing. These ridging defects not only worsen the appearance of the product, but also increase the manufacturing cost because a polishing process is added after molding when severe ridging occurs.

To solve ridging defects, various manufacturing methods have been proposed in the past, such as hot rolling at extremely low temperatures, two-speed rolling, and cold rolling re-pressing. However, the conventionally proposed manufacturing method has the problem of being difficult to apply in the field and increasing manufacturing costs, thereby reducing product productivity.

The present invention aims to provide a ferritic stainless steel with improved processability and ridging and a manufacturing method thereof by controlling the crystal grain size of the final cold-rolled annealed material by optimizing the steel components and manufacturing process to improve the processability of cold-rolled products. .

However, the problem to be solved by the present application is not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

The ferritic stainless steel with improved processability and resistance to scuffing according to an aspect of the present invention has, in weight percent, carbon (C): 0.0005 to 0.02%, nitrogen (N): 0.01 to 0.2%, and silicon (Si): 0.01 to 0.02%. 1.0%, manganese (Mn): 0.01 to 1.0%, phosphorus (P): 0.001 to 0.05%, chromium (Cr): 13.0 to 20.0%, titanium (Ti): 0.05 to 0.2%, remaining iron (Fe) and inevitable It contains impurities, satisfies the following equation (1), and has a crystal grain size of 20 to 25 ㎛.

Equation (1): 2*[Ti]/[N] ≤ 2.3

In formula (1), [Ti] and [N] mean the weight percent content of each element.

In the ferritic stainless steel with improved processability and anti-ringing properties according to one embodiment, the ridging height measured after being stretched by 15% may be 10 ㎛ or less.

Ferritic stainless steel with improved processability and anti-stinging properties according to one embodiment may have an elongation of 32% or more.

The method for manufacturing ferritic stainless steel with improved processability and resistance to scuffing according to an aspect of the present invention includes, in weight percent: carbon (C): 0.0005 to 0.02%, nitrogen (N): 0.01 to 0.2%, silicon (Si): 0.01 to 1.0%, manganese (Mn): 0.01 to 1.0%, phosphorus (P): 0.001 to 0.05%, chromium (Cr): 13.0 to 20.0%, titanium (Ti): 0.05 to 0.2%, remainder iron (Fe) and manufacturing a slab containing unavoidable impurities and satisfying the following formula (1); reheating the slab; Hot rolling and then hot rolling annealing the reheated slab; And it may include the step of cold rolling the hot rolled material and then cold rolling and annealing it at 800 to 850°C.

Equation (1): 2*[Ti]/[N] ≤ 2.3

In formula (1), [Ti] and [N] mean the weight percent content of each element.

In the method for manufacturing ferritic stainless steel with improved processability and anti-scorching properties according to an embodiment, the reheating step may be performed at 1,000 to 1,300°C.

In a method of manufacturing ferritic stainless steel with improved processability and anti-scratch properties according to an embodiment, the stainless steel may have a crystal grain size within the range of 20 to 25 ㎛.

In a method of manufacturing a ferritic stainless steel with improved processability and resistance to ridging according to an embodiment, the ridging height of the stainless steel measured after being stretched by 15% may be 10 ㎛ or less.

In a method of manufacturing ferritic stainless steel with improved processability and resistance to scuffing according to an embodiment, the stainless steel may have an elongation of 32% or more.

The present invention can provide a ferritic stainless steel with improved processability and ridging and a manufacturing method thereof by controlling the crystal grain size of the final cold-rolled annealed material by optimizing the steel components and manufacturing process to improve the processability of cold-rolled products. there is.

Figure 1 is a graph showing the ridging height (solid line) and elongation (dotted line) according to annealing temperature when manufacturing stainless steel according to an embodiment.

Figure 2a is a photograph showing the crystal grain size of stainless steel manufactured at a cold rolling annealing temperature of 750°C.

Figure 2b is a photograph showing the crystal grain size of stainless steel manufactured at a cold rolling annealing temperature of 800°C.

Figure 2c is a photograph showing the crystal grain size of stainless steel manufactured at a cold rolling annealing temperature of 850°C.

Figure 2d is a photograph showing the crystal grain size of stainless steel manufactured at a cold rolling annealing temperature of 900°C.

Figure 2e is a photograph showing the crystal grain size of stainless steel manufactured at a cold rolling annealing temperature of 950°C.

The ferritic stainless steel with improved processability and scratch resistance according to an embodiment includes, in weight percent, carbon (C): 0.0005 to 0.02%, nitrogen (N): 0.01 to 0.2%, silicon (Si): 0.01 to 1.0%, Manganese (Mn): 0.01 to 1.0%, phosphorus (P): 0.001 to 0.05%, chromium (Cr): 13.0 to 20.0%, titanium (Ti): 0.05 to 0.2%, including the remaining iron (Fe) and inevitable impurities. and satisfies the following equation (1), and the crystal grain size may satisfy the range of 20 to 25 ㎛.

Equation (1): 2*[Ti]/[N] ≤ 2.3

In formula (1), [Ti] and [N] mean the weight percent content of each element.

Hereinafter, preferred embodiments of the present invention will be described. However, the embodiments of the present invention may be modified into various other forms, and the technical idea of the present invention is not limited to the embodiments described below. Additionally, the embodiments of the present invention are provided to more completely explain the present invention to those with average knowledge in the relevant technical field.

The terms used in this application are only used to describe specific examples. Therefore, for example, a singular expression includes a plural expression, unless the context clearly requires it to be singular. In addition, terms such as “comprise” or “comprise” used in the present application are used to clearly indicate the presence of features, steps, functions, components, or combinations thereof described in the specification, and are not used to indicate other features. It should be noted that it is not used to preliminarily rule out the existence of any elements, steps, functions, components, or combinations thereof.

Meanwhile, unless otherwise defined, all terms used in this specification should be viewed as having the same meaning as generally understood by those skilled in the art to which the present invention pertains. Therefore, unless clearly defined in this specification, specific terms should not be interpreted in an overly idealistic or formal sense. For example, in this specification, singular expressions include plural expressions unless the context clearly dictates otherwise.

In addition, in this specification, "about", "substantially", etc. are used in the meaning of or close to that value when manufacturing and material tolerances inherent in the stated meaning are presented, and are used accurately to aid understanding of the present invention. It is used to prevent unscrupulous infringers from unfairly exploiting disclosures where absolute figures are mentioned.

The ferritic stainless steel with improved processability and resistance to scuffing according to an aspect of the present invention has, in weight percent, carbon (C): 0.0005 to 0.02%, nitrogen (N): 0.01 to 0.2%, and silicon (Si): 0.01 to 0.02%. 1.0%, manganese (Mn): 0.01 to 1.0%, phosphorus (P): 0.001 to 0.05%, chromium (Cr): 13.0 to 20.0%, titanium (Ti): 0.05 to 0.2%, remaining iron (Fe) and inevitable May contain impurities.

Hereinafter, the reason for limiting the composition range of each alloy element will be explained. Hereinafter, unless otherwise specified, the unit is weight%.

The carbon (C) content may be 0.0005 to 0.02 wt%, preferably 0.01 to 0.02 wt%.

C is an element that greatly affects the improvement of steel strength. If the amount of carbon (C) is less than 0.0005 wt%, the refining price to produce a high-purity product may be expensive. However, if the carbon content exceeds 0.02 wt%, corrosion resistance and formability may be reduced.

The nitrogen (N) content may be 0.01 to 0.2 wt%, preferably 0.04 to 0.2 wt%.

Nitrogen is an element that forms nitride, and it exists in an interstitial form, so if it is excessively contained, it can lead to a decrease in impact toughness and formability. Considering this, the upper limit of nitrogen content is limited to 0.2 wt% or less. However, if the nitrogen (N) content is too low, TiN crystallization may be lowered and the equiaxed crystal rate of the slab may be lowered.

The content of silicon (Si) may be 0.01 to 1.0 wt%, preferably 0.05 to 0.60 wt%.

Si can be added to deoxidize molten steel during steelmaking and is an effective element in stabilizing ferrite. If the amount of silicon (Si) is less than 0.01 wt%, the refining price becomes expensive. However, if the silicon content exceeds 1.0 wt%, there is a problem that the formability decreases due to increased impurities.

The content of manganese (Mn) may be 0.01 to 1.0 wt%, preferably 0.20 to 0.95 wt%.

Mn is an effective element in improving corrosion resistance. If the amount of manganese (Mn) is less than 0.01 wt%, the refining price becomes expensive, and if it exceeds 1.0 wt%, impurities increase and formability deteriorates.

The content of phosphorus (P) may be 0.001 to 0.05 wt%, preferably 0.001 to 0.020 wt%.

If the amount of phosphorus (P) is less than 0.001 wt%, there is a problem that the refining price becomes expensive. However, if the phosphorus content exceeds 0.05 wt%, impurities increase and formability is reduced.

The content of chromium (Cr) may be 13.0 to 20.0 wt%, preferably 13.5 to 17.5 wt%.

Cr is an effective element in ensuring corrosion resistance of steel. If the amount of chromium (Cr) is less than 13.0 wt%, there is a problem that corrosion resistance deteriorates. However, if the chromium content exceeds 20.0wt%, there is a problem of poor formability.

The content of titanium (Ti) may be 0.05 to 0.2 wt%, preferably 0.05 to 0.17 wt%.

Ti is an element that can form precipitates by preferentially combining with interstitial elements such as C and N. If the amount of titanium (Ti) is less than 0.05 wt%, there may be difficulties in manufacturing forming Ti-based inclusions. If the titanium content is excessive, there may be a problem of surface defects occurring where the Ti component reacts with oxygen and turns yellow.

The remaining component of the ferritic stainless steel according to the present invention is iron (Fe). However, in the normal manufacturing process, unintended impurities from raw materials or the surrounding environment may inevitably be mixed, so this cannot be ruled out. Since these impurities are known to anyone skilled in the ordinary manufacturing process, all of them are not specifically mentioned in this specification.

Additionally, the ferritic stainless steel according to one embodiment may satisfy the following equation (1).

Equation (1): 2*[Ti]/[N] ≤ 2.3

In formula (1), [Ti] and [N] mean the weight percent content of each element.

In the present invention, in order to improve the anti-ringing properties of stainless steel, an attempt was made to obtain a fine casting structure by controlling the contents of Ti and N to form TiN precipitates. If the value of 2*[Ti]/[N] in equation (1) calculated based on the alloy composition exceeds 2.3, there is not enough N to combine with Ti, and the effect of refining the cast structure cannot be obtained.

In the formula (1), the value of 2*[Ti]/[N] may be specifically 0.5 to 2.3, more specifically 1.0 to 2.3, and more specifically 1.7 to 2.3. Within the above range, the ferritic stainless steel according to an embodiment of the present invention has a further improved effect of controlling the microstructure, and can have better processability and resistance to scuffing.

The ferritic stainless steel according to one embodiment may have a ridging height of 10 ㎛ or less measured after being stretched by 15% in a direction perpendicular to the rolling direction. In addition, the ferritic stainless steel according to one embodiment may have an elongation of 32% or more, and preferably, the cold-rolled annealed material with a thickness of about 0.4 to 0.6 mm may have an elongation of 32% or more. The higher the elongation, the better the processability can be.

For the processability of cold-rolled stainless steel products used for home appliances, both cracking resistance and elongation must be satisfied. Since the steel must be well stretched during molding, it is desirable to limit the ridging height to about 10 ㎛ or less, preferably 8.5 ㎛ or less, in order to satisfy an elongation of 32% or more, reduce streaks after processing, and have the desired gloss.

Ferritic stainless steel according to one embodiment may have a crystal grain size of 20 to 25 ㎛, preferably 20 to 23 ㎛.

If the average grain size of stainless steel is limited to 20 to 25 ㎛, the desired elongation and ridging height can be simultaneously satisfied due to the refinement of the casting structure.

Next, a method for manufacturing ferritic stainless steel with improved anti-sting properties according to another aspect of the present invention will be described.

The method for manufacturing ferritic stainless steel with improved processability and resistance to scuffing according to an aspect of the present invention includes, in weight percent: carbon (C): 0.0005 to 0.02%, nitrogen (N): 0.01 to 0.2%, silicon (Si): 0.01 to 1.0%, manganese (Mn): 0.01 to 1.0%, phosphorus (P): 0.001 to 0.05%, chromium (Cr): 13.0 to 20.0%, titanium (Ti): 0.05 to 0.2%, remaining iron (Fe) and manufacturing a slab containing unavoidable impurities and satisfying the following formula (1); reheating the slab; Hot rolling and then hot rolling annealing the reheated slab; and cold rolling the hot rolled material and then cold rolling annealing the hot rolled material.

Equation (1): 2*[Ti]/[N] ≤ 2.3

In formula (1), [Ti] and [N] mean the weight percent content of each element.

The reasons for limiting the component range values and equation (1) of each alloy composition are as described above, and each manufacturing step will be described in more detail below.

First, after manufacturing a slab that satisfies the alloy composition, it can be subjected to a series of reheating, hot rolling, hot rolling annealing, cold rolling, and cold rolling annealing processes.

First, the slab can be heated to a temperature of 1,000 to 1,300°C in a hot rolling furnace and then hot rolled to produce a hot rolled steel sheet.

If the heating temperature is low, it may be difficult to re-decompose the coarse precipitates generated during slab manufacturing. Considering this, the heating temperature may be 1,000°C or higher. However, if the heating temperature is too high, internal crystal grains may become too coarse, and surface oxidation may occur severely, causing surface defects. Considering this, the upper limit of the heating temperature may be limited to 1,300°C.

In the hot rolling, finish rolling may be performed at 700 to 900°C.

If the finish rolling temperature is less than 700°C, sticking may occur on the surface of the slab during hot rolling. However, if the finish rolling temperature exceeds 900°C, coarse ferrite crystal grains may be formed, which may result in poor anti-sting properties.

Hot rolled materials recrystallize the casting structure through hot rolling annealing. At this time, hot rolling annealing can be performed at a temperature of 700 to 900°C.

If the hot rolling annealing temperature is low, the stress formed during hot rolling may not be sufficiently removed and workability may be reduced. However, if the hot rolling annealing temperature is too high, the strength may decrease due to grain coarsening and the resistance to cracking may decrease.

The hot rolled annealed material can be cold rolled and then cold rolled and annealed to produce a cold rolled steel sheet. At this time, cold rolling annealing can be performed at a temperature of 800 to 850°C.

By satisfying the cold rolling annealing temperature, the crystal grain size can be controlled to 20 to 25 ㎛. When the cold rolling annealing temperature exceeds 850°C, the crystal grain size becomes coarse, and as a result, a {001}/ND crystal orientation structure that reduces the resistance to cracking grows. When the {001}/ND crystal orientation structure grows, the plastic anisotropy with the matrix increases, which not only reduces the resistance to scratching but also reduces the surface roughness. However, when the cold rolling annealing temperature is less than 800°C, recrystallization does not occur, which may result in both elongation and anti-stiffness being inferior.

As described above, by optimizing the reheating, hot rolling annealing, and cold rolling annealing processes as well as the alloy components and component relations, grain refinement within the casting structure can be realized to secure the anti-ringing properties and elongation of ferritic stainless steel.

Stainless steel manufactured according to one embodiment may have a crystal grain size in the range of 20 to 25 ㎛. By satisfying the above grain size range, stainless steel with excellent machinability and desired machinability and anti-ringing properties can be obtained.

Stainless steel manufactured according to one embodiment may have a ridging height of 10 ㎛ or less measured after being stretched by 15% in a direction perpendicular to the rolling direction. By satisfying the above ridging height range, it is possible to obtain stainless steel with fewer streaks after processing and the desired glossiness.

Stainless steel manufactured according to one embodiment may have an elongation of 32% or more. By satisfying the above elongation range, the steel material is easily stretched during forming, and stainless steel with excellent formability can be obtained.

Hereinafter, the present invention will be described in more detail through examples. However, the following examples are intended to illustrate the present invention in more detail, and the scope of the present invention is not limited by the following examples.

[Example]

Slabs were manufactured in a vacuum induction melting furnace for various alloy composition ranges shown in Table 1 below. The manufactured slab was reheated in a furnace at 1,100°C, then hot rolled to produce a hot rolled steel sheet, and then air cooled. The air-cooled hot-rolled steel sheet was hot-rolled and annealed at 850°C, then cold-rolled to a thickness of 0.5 mm, and then cold-rolled and annealed to the temperature shown in Table 2 below to prepare a cold-rolled steel sheet specimen.

In addition, the following equation (1) was calculated and the value of equation (1) was shown in Table 1 below.

Equation (1): 2*[Ti]/[N]

In formula (1), [Ti] and [N] mean the weight percent content of each element.

division	Alloy composition (% by weight)							Equation (1)	note
	C	Si	Mn	P	Cr	Ti	N
River 1	0.020	0.11	0.50	0.001	14.0	0.20	0.062	6.45	Comparative example
River 2	0.010	0.20	0.28	0.001	16.8	0.19	0.066	5.76
River 3	0.020	0.24	0.81	0.006	16.2	0.17	0.196	1.73	invention example
River 4	0.015	0.15	0.88	0.007	15.8	0.30	0.080	7.50	Comparative example
strong 5	0.020	0.20	0.64	0.001	14.9	0.14	0.146	1.92	invention example
River 6	0.018	0.28	0.70	0.003	16.5	0.16	0.150	2.13
River 7	0.008	0.09	0.94	0.008	13.9	0.18	0.149	2.42	Comparative example
River 8	0.014	0.17	0.73	0.010	17.2	0.18	0.138	2.61
River 9	0.020	0.55	0.90	0.015	16.0	0.05	0.045	2.23	invention example

Table 2 below shows the average grain size in the cast structure at each cold rolling annealing temperature for steels having the alloy composition of Table 1, and the ridging height and elongation measured after being stretched by 15%. In addition, Figure 1 shows the correlation between the ridging height and elongation at each cold rolling annealing temperature for steel materials having an alloy composition of steel 3. Crystal grain size was measured by photographing the cast structure using OM (optical microscopy). Figures 2a to 2e are photographs of the crystal grain size of stainless steel obtained by processing a steel material with an alloy composition of Steel 3 at cold rolling annealing temperatures of 750°C, 800°C, 850°C, 900°C, and 950°C, respectively. The ridging height is determined by measuring the size of the specimen. After tensing the specimen by 15% in the direction perpendicular to the rolling direction, the ridging bending height was measured using a surface roughness machine.

The elongation rate was calculated from the amount elongated until the moment of fracture when a cold-rolled stainless steel product was uniaxially stretched, divided by the initial length.

ingredient	Cold rolled annealing Temperature (℃)	Crystal grain size (㎛)	Rising height (㎛)	Elongation (%)	note
River 1	800	28.4	16.8	29.0	Comparative example
	820	33.3	22.3	29.5
	850	41.9	29.2	32.6
River 2	800	30.6	15.3	30.3	Comparative example
	820	38.4	18.2	32.6
	850	45.5	18.9	33.5
River 3	750	unredetermination	12.5	16.9	Comparative example
	800	20.8	8.4	32.0	invention example
	820	21.3	8.2	32.2
	850	22.1	7.9	32.6
	880	28.5	10.1	33.4	Comparative example
	900	31.2	10.3	34.2
	920	40.4	12.3	34.3
	950	44.8	12.8	34.5
	960	49.2	13.9	35.0
River 4	800	31.2	18.2	28.6	Comparative example
	820	39.8	19.6	33.1
	850	48.7	20.3	34.0
strong 5	800	20.9	8.6	32.3	invention example
	820	21.5	8.9	33.5
	850	23.4	9.3	33.9
River 6	800	21.3	9.0	32.0	invention example
	820	21.9	9.2	32.5
	850	22.5	9.6	33.0
River 7	800	29.0	19.2	30.0	Comparative example
	820	31.5	19.5	30.9
	850	36.0	22.8	32.4
River 8	800	32.6	18.4	31.1	Comparative example
	820	38.8	19.9	31.3
	850	44.1	22.6	32.5
River 9	800	22.6	9.2	32.3	invention example
	820	23.9	9.5	32.5
	850	24.0	9.7	33.0

Referring to Tables 1 and 2 above, steels 3, 5, 6, and 9 satisfy the alloy composition, component range, and equation (1) presented in the present invention, and if they satisfy the cold rolling annealing temperature, the casting structure The crystal grain size was refined to 20 to 25 ㎛ (see FIGS. 2B and 2C), the ridging height was 10 ㎛ or less, and the elongation was 32% or more. In other words, it can be confirmed that the invention example that satisfies all of the alloy composition, component range, equation (1), and cold rolling annealing temperature is excellent in both workability and anti-ringing properties. However, the alloy composition, component range, and equation ( Even if 1) was satisfied, in the case of the comparative example in which the cold rolling annealing temperature was not satisfied, one or more physical properties among crystal grain size, ridging height, or elongation were not satisfied.

Specifically, referring to Figures 1 and 2a, when the cold rolling annealing temperature was less than 800°C, recrystallization was not formed, so the ridging height exceeded 10 ㎛ and the elongation was significantly reduced.

Meanwhile, referring to FIGS. 1, 2D, and 2E, when the cold rolling annealing temperature exceeded 850°C, the elongation was improved, but the crystal grains in the cast structure were coarsened and the ridging height exceeded 10 ㎛. In other words, it can be seen that as the cold rolling annealing temperature increases, the elongation improves, but the casting structure becomes coarse, and the ridging height tends to increase accordingly.

In addition, steels 1, 2, 4, 7, and 8 have a low content of N that can combine with Ti, even though the value of equation (1) exceeds 2.3 and the cold rolling annealing temperature satisfies 800 to 850°C, resulting in equiaxed crystal grain refinement. could not be implemented. Accordingly, it can be confirmed that the jing resistance is also poor.

In the foregoing, exemplary embodiments of the present invention have been described, but the present invention is not limited thereto, and a person skilled in the art will recognize the present invention within the scope and spirit of the following claims. You will understand that various changes and modifications are possible.

According to the present invention, in order to improve the processability of cold-rolled products, ferritic stainless steel with improved processability and ridging is provided by optimizing the steel components and manufacturing process and controlling the crystal grain size of the final cold-rolled annealed material, and a manufacturing method thereof. As it is possible, industrial applicability is recognized.

Claims (8)

1. In weight percent: Carbon (C): 0.0005 to 0.02%, Nitrogen (N): 0.01 to 0.2%, Silicon (Si): 0.01 to 1.0%, Manganese (Mn): 0.01 to 1.0%, Phosphorus (P): 0.001 to 0.05%, chromium (Cr): 13.0 to 20.0%, titanium (Ti): 0.05 to 0.2%, including the remaining iron (Fe) and inevitable impurities,

   It satisfies the following equation (1),

   Ferritic stainless steel with improved machinability and anti-ringing properties that satisfies the range of 20 to 25 ㎛ grain size:

   Equation (1): 2*[Ti]/[N] ≤ 2.3

   In formula (1), [Ti] and [N] mean the weight percent content of each element.
2. According to paragraph 1,

   A ferritic stainless steel with improved processability and ridging resistance, with a ridging height of 10 ㎛ or less measured after being stretched by 15%.
3. According to paragraph 1,

   A ferritic stainless steel with an elongation of 32% or more and improved machinability and resistance to scuffing.
4. In weight percent: Carbon (C): 0.0005 to 0.02%, Nitrogen (N): 0.01 to 0.2%, Silicon (Si): 0.01 to 1.0%, Manganese (Mn): 0.01 to 1.0%, Phosphorus (P): 0.001 to 0.05%, chromium (Cr): 13.0 to 20.0%, titanium (Ti): 0.05 to 0.2%, the remaining iron (Fe) and inevitable impurities, and manufacturing a slab that satisfies the following formula (1);

   reheating the slab;

   Hot rolling and then hot rolling annealing the reheated slab; and

   A method of manufacturing ferritic stainless steel with improved workability and anti-stinging, comprising the step of cold rolling the hot rolled material and then cold rolling and annealing it at 800 to 850°C:

   Equation (1): 2*[Ti]/[N] ≤ 2.3

   In formula (1), [Ti] and [N] mean the weight percent content of each element.
5. According to clause 4,

   The reheating step is performed at 1,000 to 1,300°C. A method of manufacturing ferritic stainless steel with improved processability and anti-singing properties.
6. According to clause 4,

   A method of manufacturing a ferritic stainless steel with improved processability and anti-ringing properties, wherein the stainless steel satisfies a crystal grain size of 20 to 25 ㎛.
7. According to clause 4,

   A method of manufacturing a ferritic stainless steel with improved processability and ridging resistance, wherein the stainless steel has a ridging height of 10 ㎛ or less measured after being stretched by 15%.
8. According to clause 4,

   The stainless steel is a method of manufacturing a ferritic stainless steel with improved machinability and anti-ringing properties, wherein the stainless steel has an elongation of 32% or more.

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