Preparation method of stainless steel for elevator sill and stainless steel elevator sill

Abstract

The invention discloses a preparation method of stainless steel for an elevator sill and the stainless steel elevator sill. The preparation method of a modified stainless steel profile for the elevator sill comprises the following steps: smelting raw materials in a furnace according to a formula, and continuously casting to obtain a stainless steel billet; carrying out homogenization treatment on the stainless steel billet ingot; the stainless steel billet obtained after homogenization treatment is rolled and formed, and a stainless steel profile in a preset shape is obtained; carrying out heat treatment on the stainless steel profile with the preset shape; and performing surface treatment on the stainless steel profile subjected to heat treatment to obtain the modified stainless steel profile for the elevator sill. Wherein the surface treatment comprises the steps of carrying out surface nanocrystallization treatment and ion nitriding treatment on the stainless steel profile subjected to heat treatment. According to the modified stainless steel profile for the elevator sill, the tensile strength is larger than or equal to 529 MPa, the yield strength is larger than or equal to 210 MPa, and the ten-thousand-time abrasion loss is smaller than or equal to 0.09 mm.

Description

Technical Field

[0001] The present invention relates to the technical field of stainless steel materials, and in particular to a method for preparing a stainless steel profile for an elevator sill and a stainless steel elevator sill. Background Art

[0002] The elevator sill is an important component of the elevator system. Located below the landing door and car door, the elevator sill guides the door leaf opening and closing, prevents foreign objects from entering the shaft, and bears part of the load. The performance of the elevator sill directly affects the reliability, safety, and service life of the elevator.

[0003] 304 stainless steel has good processing properties and can be easily made into the required shape and size through cutting, welding, and forming. Its corrosion resistance and mechanical strength can also meet the requirements of elevator components. However, since elevator doors open and close many times a day, especially in places with high passenger flow, the wear between the guide shoe and the sill may cause the sill surface flatness to decrease, thereby affecting the smoothness of the elevator operation. Therefore, it is necessary to improve the stainless steel used for elevator sills to improve the wear resistance while meeting the mechanical properties and corrosion resistance. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for preparing stainless steel for elevator sills and a stainless steel elevator sill. The tensile strength of the modified stainless steel profile for the elevator sill prepared is ≥529MPa, the yield strength is ≥210MPa, and the wear amount after 10,000 times is ≤0.09mm.

[0005] In order to solve the above problems, the present invention discloses a method for preparing a modified stainless steel profile for an elevator sill, comprising the following steps:

[0006] The raw materials are charged into a furnace for melting according to a formula, and then continuously cast to obtain a stainless steel ingot; wherein the raw material formula, in weight percentage, is as follows: C 0.03% to 0.08%, Cr 18.5% to 20.5%, Ni 8.5% to 10.5%, Mo 0.8% to 3.5%, N 0.15% to 0.25%, Cu 1.2% to 1.8%, Nb 0.05% to 0.12%, Ce ≤ 0.05%, La ≤ 0.05%, and the balance is Fe and unavoidable impurities;

[0007] homogenizing the stainless steel ingot;

[0008] The homogenized stainless steel ingot is rolled and formed to obtain a stainless steel profile of a preset shape;

[0009] performing heat treatment on the stainless steel profile of the preset shape;

[0010] The heat-treated stainless steel profile is subjected to surface treatment to obtain the modified stainless steel profile for the elevator sill; wherein the surface treatment includes surface nano-processing and ion nitriding treatment of the heat-treated stainless steel profile.

[0011] As an improvement of the above technical solution, ultrasonic shot blasting or shot peening is used for the surface nano-treatment, with an ultrasonic impact frequency of 25kHz to 35kHz, a current of 0.6A to 0.8A, a pre-pressure of 0.25MPa to 0.45MPa, a feed speed of 1500mm / min to 1800mm / min, and a step distance of 0.1mm to 0.3mm.

[0012] As an improvement of the above technical solution, low-temperature pulse ion nitriding is used for the ion nitriding treatment, with a voltage of 600V to 900V, a duty cycle of 0.6 to 0.8, a flow ratio of N2 to H2 of 1:(2.5 to 4), a heating temperature of 400°C to 450°C, and a holding time of 4h to 6h.

[0013] As an improvement of the above technical solution, the ion nitriding treatment includes the following steps:

[0014] Control the flow ratio of N2 to H2 to be 1:(2.5-4), heat to 380℃-420℃, and keep warm for 3.5h-5.5h;

[0015] Control the flow ratio of N2 to H2 to 1:(2.5-4), continue heating to 480℃-520℃, and keep warm for 1.5h-3.5h;

[0016] Evacuate and fill with Ar or N2 for protection, then cool to room temperature.

[0017] As an improvement of the above technical solution, the treatment temperature of the homogenization treatment is 1200° C. to 1300° C., and the treatment time is 2 hours to 8 hours.

[0018] As an improvement of the above technical solution, the starting rolling temperature is 1100°C to 1200°C, and the finishing rolling temperature is 950°C to 1000°C;

[0019] The number of rolling passes is 10 to 20, the holding time between each pass is 10 to 15 minutes, and the total rolling deformation is 50% to 75%.

[0020] As an improvement of the above technical solution, the heat treatment includes a first stage heat treatment and a second stage heat treatment. The treatment temperature of the first stage heat treatment is 1050℃~1100℃, and the treatment time is 30min~40min; the treatment temperature of the second stage heat treatment is 550℃~650℃, and the treatment time is 2h~4h.

[0021] As an improvement of the above technical solution, the raw material formula in weight percentage is as follows: C 0.03%-0.05%, Cr 18.5%-19.5%, Ni 8.5%-9.5%, Mo 1.2%-1.5%, N 0.15%-0.2%, Cu 1.2%-1.8%, Nb 0.08%-0.1%, Ce 0.01%-0.05%, La 0.01%-0.03%, and Ce / La=1:(0.3-0.5), and the balance is Fe and unavoidable impurities.

[0022] As an improvement of the above technical solution, the modified stainless steel profile used for the elevator sill has a tensile strength of ≥529MPa, a yield strength of ≥210MPa, and a wear loss of ≤0.09mm after 10,000 times.

[0023] Correspondingly, the present invention further discloses a stainless steel elevator sill, the stainless steel elevator sill comprising a sill body and a support frame supporting the sill body, the sill body being fixedly connected to the support frame, and the sill body being manufactured by the above-mentioned manufacturing method;

[0024] The sill body includes a bottom plate portion, a side plate portion and an extension portion, which are respectively bent vertically upward along both sides of the bottom plate portion to form the side plate portion, and bent horizontally along the top of the side plate portion to the side away from the bottom plate portion to form the extension portion, and the bottom plate portion and the side plate portion form a guide groove.

[0025] The implementation of the present invention has the following beneficial effects:

[0026] 1. The present invention rationally regulates the raw material formula and effectively improves the mechanical properties of stainless steel profiles by adjusting the element ratio and adding rare earth elements.

[0027] 2. The present invention effectively improves the wear resistance of stainless steel through a surface strengthening process. After surface nano-treatment, the grains on the surface of the stainless steel profile are refined, providing channels for the diffusion of nitrogen atoms. Combined with ion nitriding, the surface hardness and wear resistance of austenitic stainless steel are simultaneously improved.

[0028] 3. The present invention combines the optimization of raw material formula, homogenization process, rolling process, heat treatment process and surface treatment process to obtain stainless steel for elevator sill. The tensile strength of the obtained stainless steel elevator sill is ≥529MPa, the yield strength is ≥210MPa, and the wear amount after 10,000 times is ≤0.09mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a flow chart of a method for preparing stainless steel for elevator sills provided by an embodiment of the present invention;

[0030] Figure 2 is a top view of a stainless steel elevator sill provided by an embodiment of the present invention;

[0031] Figure 3 yes Figure 2 AA cross-section diagram. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is described in further detail below.

[0033] See also Figure 1 The present invention provides a method for preparing a modified stainless steel profile for an elevator sill, comprising the following steps:

[0034] S1. Smelting raw materials according to a formula, and continuously casting to obtain a stainless steel ingot. The raw material formula, in weight percentage, is as follows: C 0.03%-0.08%, Cr 18.5%-20.5%, Ni 8.5%-10.5%, Mo 0.8%-2.5%, N 0.15%-0.25%, Cu 1.2%-1.8%, Nb 0.05%-0.12%, Ce ≤ 0.05%, La ≤ 0.05%, and the balance is Fe and unavoidable impurities.

[0035] Carbon (C) significantly improves austenite strength and high- and low-temperature resistance through solid solution strengthening. Carbon and chromium can form a series of compounds. A higher C mass fraction consumes more Cr, which in turn reduces the Cr mass fraction in the solid solution and reduces corrosion resistance. In one embodiment, the C content is 0.03% to 0.08%, preferably 0.03% to 0.05%.

[0036] As a major alloying element, Cr is key to stainless steel's corrosion resistance. The addition of Cr forms a stable CrO2 oxide film on the stainless steel surface, isolating the corrosive medium from the substrate. This reduces the steel's passivation current, increases the substrate's electrode potential, lowers the electromotive force of the galvanic cell, and improves the steel's corrosion resistance. However, increasing the Cr content in austenitic stainless steel accelerates the precipitation of secondary phases such as σ and χ phases, and also forms CrN with nitrogen. In one embodiment, the Cr content is 18.5% to 20.5%, preferably 18.5% to 19.5%.

[0037] Ni effectively stabilizes the austenite phase and can effectively curb structural changes during processing by lowering the transformation temperature of martensite. In one embodiment, Ni is 8.5% to 10.5%, preferably 8.5% to 9.5%.

[0038] Nitrogen is an austenite-stabilizing element that promotes the formation of austenite in stainless steel, improving its strength without significantly compromising its plasticity and toughness. Nitrogen also makes the chromium distribution in the steel more uniform, mitigating the effects of carbon on intergranular corrosion. In one embodiment, the nitrogen content is 0.15% to 0.25%, preferably 0.15% to 0.2%.

[0039] Mo has a significant solid solution strengthening effect in austenite, improving the strength and high and low temperature resistance of austenite. In one embodiment, Mo is 0.8% to 2.5%, preferably, Mo is 1.2% to 1.5%.

[0040] Cu is an austenite-forming element and can be combined with other elements to improve austenite strength and high and low temperature resistance. In one embodiment, Cu is 1.2% to 1.8%, preferably, Cu is 1.2% to 1.8%.

[0041] Ce and La can refine grains, change the properties, morphology, and distribution of inclusions in austenite, and accumulate at grain boundaries and within grains, strengthening the grain boundaries and increasing their strength and corrosion resistance, thereby improving the hot working properties of stainless steel. In one embodiment, Ce ≤ 0.05%, La ≤ 0.05%, preferably Ce 0.01% to 0.05%, La 0.01% to 0.03%, and Ce / La = 1:(0.3 to 0.5). By controlling the mass ratio of Ce to La, hot working properties can be improved while ensuring corrosion resistance.

[0042] Nb can be used to fix carbon, reducing uneven strength in stainless steel and improving the oxidation resistance and strength of austenitic stainless steel. Furthermore, the combined action of Ce, La, and Nb dissolved in the steel pins the grains within the steel and at the grain boundaries, achieving dual refinement. This reduces the segregation of impurity elements at grain boundaries, strengthens the grain boundaries, and improves corrosion resistance and mechanical properties. In one embodiment, the Nb content is 0.05% to 0.12%, preferably 0.08% to 0.1%.

[0043] The composition of existing 304 stainless steel is: C ≤ 0.08%, Si ≤ 1%, Mn ≤ 2%, P ≤ 0.035%, S ≤ 0.03%, Cr 18%-20%, Ni 8%-11%, with the balance being Fe and unavoidable impurities. The present invention reduces the use of ferrite-stabilizing elements, controls the proportion of austenite-stabilizing elements, and adds trace amounts of rare earth elements, ensuring that the profile possesses excellent mechanical properties, wear resistance, and corrosion resistance. Furthermore, achieving the above technical effects requires the use of the present invention's subsequent preparation method.

[0044] S2. homogenizing the stainless steel ingot.

[0045] In one embodiment, the homogenization treatment is performed at a temperature of 1200°C to 1300°C for 2 to 8 hours. Homogenization can eliminate component segregation and dissolve harmful precipitates, thereby improving processability and mechanical properties. This facilitates subsequent forming during processing, ultimately resulting in a stainless steel billet with stable performance and good processability. In a preferred embodiment, the heating rate is 50°C / h to 150°C / h. The heating rate is controlled to reduce element segregation and promote sufficient dendritic ablation while avoiding excessive grain growth and billet oxidation.

[0046] S3. Rolling and forming the homogenized stainless steel ingot to obtain a stainless steel profile of a preset shape.

[0047] In one embodiment, the rolling start temperature is 1100°C to 1200°C, and the final rolling temperature is 950°C to 1000°C. The number of rolling passes is 10 to 20, with a holding time between passes of 10 to 15 minutes. The total rolling deformation is 50% to 75%. Multiple hot rolling passes control the dynamic recrystallization of the stainless steel, thereby refining the grain size and avoiding coarse and uneven grains.

[0048] It is understood that after rolling, the stainless steel sheet is processed into a preset shape through processes such as bending. Figure 2 and Figure 3 As shown, in one embodiment of the invention, a stainless steel elevator sill includes a sill body 1 and a support frame 2 supporting the sill body 1, the sill body 1 is fixedly connected to the support frame 2, and the sill body 1 is manufactured by the above-mentioned preparation method.

[0049] The sill body 1 includes a bottom plate portion 11, a side plate portion 12 and an extension portion 13. The side plate portions 12 are vertically bent upward along both sides of the bottom plate portion 11, and the extension portion 13 is horizontally bent along the top of the side plate portion 12 toward the side away from the bottom plate portion 11. The bottom plate portion 11 and the side plate portion 12 form a guide groove.

[0050] Furthermore, the support frame 2 can be made of aluminum alloy or stainless steel. In a preferred embodiment, the support frame 2 is manufactured using the aforementioned manufacturing method. Specifically, the support frame 2 includes a horizontal support portion 21 and vertical support portions 22 formed by vertically bending upward along both sides of the horizontal support portion 21. It is understood that the bottom plate portion 11 and the horizontal support portion 21 are fixedly connected by fasteners, and the extension portion 13 is welded to the vertical support portion 22.

[0051] S4. Heat treating the stainless steel profile of the preset shape.

[0052] In one embodiment, the heat treatment includes a first stage heat treatment and a second stage heat treatment, wherein the treatment temperature of the first stage heat treatment is 1050°C to 1100°C, and the treatment time is 30min to 40min; the treatment temperature of the second stage heat treatment is 450°C to 480°C, and the treatment time is 3h to 4h.

[0053] Heat treatment is combined with rolling process to further refine the stainless steel grains and eliminate stress.

[0054] S5. Surface treatment is performed on the heat-treated stainless steel profile to obtain the modified stainless steel profile for the elevator sill. The surface treatment includes surface nano-crystallization and ion nitriding treatment of the heat-treated stainless steel profile. Specifically, the surface treatment includes the following steps:

[0055] S51. Use ultrasonic shot blasting or shot peening to perform the surface nano-treatment, with an ultrasonic impact frequency of 25kHz to 35kHz, a current of 0.6A to 0.8A, a pre-pressure of 0.25MPa to 0.45MPa, a feed speed of 1500mm / min to 1800mm / min, and a step distance of 0.1mm to 0.3mm.

[0056] Frequency determines both impact energy and coverage uniformity. If the frequency is too low, surface plastic deformation is minimal, resulting in poor grain refinement and hindering nitrogen diffusion. If the frequency is too high, surface roughness may increase, affecting nitriding uniformity. By using a higher frequency and lower current to balance surface activity and roughness, and lower preload and faster feed speeds to ensure uniform contact and energy transfer between the shot and the stainless steel profile, high coverage can be achieved through parameter adjustment.

[0057] S52. Use low-temperature pulse ion nitriding to perform the ion nitriding treatment, with a voltage of 600V to 900V, a duty cycle of 0.6 to 0.8, a flow ratio of N2 to H2 of 1:(2.5 to 4), a heating temperature of 400°C to 450°C, and a holding time of 4h to 6h.

[0058] Ion nitriding promotes the formation of a compound layer (γ'-Fe4N or ε-Fe2-3N). Excessive N2 content can lead to brittleness, while excessive H2 content can reduce the nitriding rate. If the heating temperature is too low, the nitriding efficiency is low; if the heating temperature is too high, chromium nitride (CrN) precipitates from the stainless steel, reducing corrosion resistance. Parameter adjustment can be used to increase the nitriding rate and depth while preventing the excessive formation of brittle phases.

[0059] In a preferred embodiment, the ion nitriding treatment comprises the following steps:

[0060] S521. Control the flow ratio of N2 to H2 to 1:(2.5-4), heat to 380°C-420°C, and keep warm for 3.5h-5.5h.

[0061] S522. Control the flow ratio of N2 to H2 to 1:(2.5-4), continue heating to 480°C-520°C, and keep warm for 1.5h-3.5h.

[0062] S523. Evacuate and fill with Ar or N2 for protection, then cool to room temperature.

[0063] The use of staged nitriding can improve the wear resistance of stainless steel profiles by more than 30% without surface peeling.

[0064] By adopting the preparation method provided by the present invention, the raw material formula is optimized, the use of ferrite stabilizing elements is reduced, the proportion of austenite stabilizing elements is controlled, and trace rare earth elements are added to effectively improve the mechanical strength of the stainless steel profile. Subsequently, homogenization, rolling, forming and heat treatment are carried out, and the stainless steel profile after heat treatment is surface treated to further improve the austenite microstructure, avoid ferrite formation, and at the same time improve corrosion resistance and wear resistance.

[0065] Through comprehensive adjustment of the above formula and process, a modified stainless steel profile for elevator sills with a tensile strength ≥217MPa, a yield strength ≥170MPa, and a wear amount ≤0.1mm after 10,000 times can be obtained.

[0066] The present invention will be further described below with specific embodiments:

[0067] Example 1

[0068] This embodiment provides a method for preparing a modified stainless steel profile for an elevator sill, comprising the following steps:

[0069] S100. Smelting raw materials according to a formula, and continuously casting to obtain a stainless steel ingot; wherein the raw material formula, in weight percentage, is as follows: C 0.07%, Cr 20.5%, Ni 10.5%, Mo 2.5%, N 0.25%, Cu 1.8%, Nb 0.12%, Ce 0.02%, La 0.02%, and the balance is Fe and unavoidable impurities.

[0070] S200: homogenizing the stainless steel ingot at a temperature of 1250° C. for 5 hours.

[0071] S300: The homogenized stainless steel ingot is rolled and formed to obtain a stainless steel profile of a predetermined shape. The starting rolling temperature is 1150°C, the final rolling temperature is 980°C, the number of rolling passes is 12, the holding time between each pass is 10 minutes, and the total rolling deformation is 55%.

[0072] S400: Heat treat the stainless steel profiles in the preset shape. The heat treatment includes a first stage heat treatment at a temperature of 1080°C for 35 minutes and a second stage heat treatment at a temperature of 600°C for 3 hours.

[0073] S500: Surface treatment is performed on the heat-treated stainless steel profile to obtain a modified stainless steel profile for an elevator sill. The surface treatment includes surface nano-crystallization and ion nitriding of the heat-treated stainless steel profile. The ion nitriding includes the following steps:

[0074] S510, control the flow ratio of N2 to H2 to 1:3, heat to 500°C, and keep warm for 7 hours.

[0075] S520, evacuate and fill with Ar or N2 for protection, and cool to room temperature.

[0076] Example 2

[0077] This embodiment provides a method for preparing a modified stainless steel profile for an elevator sill. This method differs from Example 1 in that the raw material formula, in weight percentage, is as follows: C 0.05%, Cr 19%, Ni 9%, Mo 1.3%, N 0.18%, Cu 1.5%, Nb 0.096%, Ce 0.04%, La 0.02%, with the balance being Fe and unavoidable impurities. All other aspects are the same as in Example 1.

[0078] Example 3

[0079] This embodiment provides a method for preparing a modified stainless steel profile for an elevator sill. The difference between this method and embodiment 2 is that the ion nitriding treatment includes the following steps:

[0080] S510, control the flow ratio of N2 to H2 to 1:3, heat to 400°C, and keep warm for 5 hours.

[0081] S520, control the flow ratio of N2 to H2 to 1:3, heat to 500°C, and keep warm for 2 hours.

[0082] S530, evacuate and fill with Ar or N2 for protection, and cool to room temperature.

[0083] The rest are the same as in Example 2.

[0084] Examples 1 to 3 were tested for tensile strength and yield strength at room temperature, with reference to GB / T 228.1-2021, "Tension Tests on Metallic Materials - Part 1: Room Temperature Test Methods." Wear was tested with reference to GB / T 12444-2006, "Wear Test Methods for Metallic Materials." A reciprocating wear tester was used with a load of 180 N, a friction pair consisting of a stainless steel sill and a nylon guide shoe, a sliding speed of 0.2 m / s, and 10,000 cycles to measure the depth of the surface wear scar.

[0085] The specific results are as follows:

[0086]

[0087] The above is a preferred embodiment of the invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for preparing a modified stainless steel profile for an elevator sill, characterized in that: The following steps are involved: The raw materials are charged into a furnace for melting according to a formula, and then continuously cast to obtain a stainless steel ingot; wherein the raw material formula, in weight percentage, is as follows: C 0.03% to 0.08%, Cr 18.5% to 20.5%, Ni 8.5% to 10.5%, Mo 0.8% to 3.5%, N 0.15% to 0.25%, Cu 1.2% to 1.8%, Nb 0.05% to 0.12%, Ce ≤ 0.05%, La ≤ 0.05%, and the balance is Fe and unavoidable impurities; homogenizing the stainless steel ingot; The homogenized stainless steel ingot is rolled and formed to obtain a stainless steel profile of a preset shape; performing heat treatment on the stainless steel profile of the preset shape; The heat-treated stainless steel profile is subjected to surface treatment to obtain the modified stainless steel profile for the elevator sill; wherein the surface treatment includes surface nano-processing and ion nitriding treatment of the heat-treated stainless steel profile.

2. The method for preparing the modified stainless steel profile for elevator sill according to claim 1, characterized in that: The surface nano-treatment is performed by ultrasonic shot blasting or shot peening, with an ultrasonic impact frequency of 25kHz to 35kHz, a current of 0.6A to 0.8A, a preload of 0.25MPa to 0.45MPa, a feed speed of 1500mm / min to 1800mm / min, and a step distance of 0.1mm to 0.3mm.

3. The method for preparing the modified stainless steel profile for elevator sill according to claim 1, wherein: The ion nitriding treatment is carried out by low-temperature pulse ion nitriding, with a voltage of 600V to 900V, a duty cycle of 0.6 to 0.8, a flow ratio of N2 to H2 of 1:(2.5 to 4), a heating temperature of 400°C to 450°C, and a holding time of 4h to 6h.

4. The method for preparing a modified stainless steel profile for an elevator sill according to claim 3, wherein: The ion nitriding treatment comprises the following steps: Control the flow ratio of N2 to H2 to be 1:(2.5-4), heat to 380℃-420℃, and keep warm for 3.5h-5.5h; Control the flow ratio of N2 to H2 to 1:(2.5-4), continue heating to 480℃-520℃, and keep warm for 1.5h-3.5h; Evacuate and fill with Ar or N2 for protection, then cool to room temperature.

5. The method for preparing a modified stainless steel profile for an elevator sill according to claim 1, wherein: The treatment temperature of the homogenization treatment is 1200° C. to 1300° C., and the treatment time is 2 hours to 8 hours.

6. The method for preparing a modified stainless steel profile for an elevator sill according to claim 1, wherein: The starting rolling temperature is 1100°C to 1200°C, and the finishing rolling temperature is 950°C to 1000°C; The number of rolling passes is 10 to 20, the holding time between each pass is 10 to 15 minutes, and the total rolling deformation is 50% to 75%.

7. The method for preparing a modified stainless steel profile for an elevator sill according to claim 1, wherein: The heat treatment includes a first stage heat treatment and a second stage heat treatment. The treatment temperature of the first stage heat treatment is 1050° C. to 1100° C., and the treatment time is 30 min to 40 min. The treatment temperature of the second stage heat treatment is 550° C. to 650° C., and the treatment time is 2 h to 4 h.

8. The method for preparing a modified stainless steel profile for an elevator sill according to claim 1, wherein: The raw material formula in weight percentage is as follows: C 0.03%-0.05%, Cr 18.5%-19.5%, Ni 8.5%-9.5%, Mo 1.2%-1.5%, N 0.15%-0.2%, Cu 1.2%-1.8%, Nb 0.08%-0.1%, Ce 0.01%-0.05%, La 0.01%-0.03%, and Ce / La=1:(0.3-0.5), and the balance is Fe and unavoidable impurities.

9. The method for preparing a modified stainless steel profile for an elevator sill according to claim 1, wherein: The modified stainless steel profile used for the elevator sill has a tensile strength of ≥529MPa, a yield strength of ≥210MPa, and a wear loss of ≤0.09mm after 10,000 times.

10. A stainless steel elevator sill, characterized in that: The stainless steel elevator sill comprises a sill body and a support frame supporting the sill body, the sill body is fixedly connected to the support frame, and the sill body is made by the preparation method according to any one of claims 1 to 9; The sill body includes a bottom plate portion, a side plate portion and an extension portion, which are respectively bent vertically upward along both sides of the bottom plate portion to form the side plate portion, and bent horizontally along the top of the side plate portion to the side away from the bottom plate portion to form the extension portion, and the bottom plate portion and the side plate portion form a guide groove.

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