A high nickel content stainless steel manufacturing process and application

Abstract

The present invention discloses a high-nickel content stainless steel manufacturing process and application, wherein a high-nickel content stainless steel manufacturing process comprises the following steps: S1, raw material preparation, obtaining waste 316L stainless steel according to 3% to 8% mass fraction, obtaining high carbon ferrochrome raw material according to 0.8% to 1.2% mass fraction, mixing the two components of raw materials to obtain a stainless steel mixed raw material, and at the same time, obtaining alloy elements according to mass fraction; S2, smelting and pouring, adding the stainless steel mixed raw material to a high-temperature electric furnace for smelting, melting the stainless steel mixed raw material by high-temperature melting, and then adding the alloy elements to the molten stainless steel mixed raw material. The present invention manufactures high-nickel content stainless steel by adopting cold and hot mixing treatment and heat treatment, which greatly reduces the adverse effects of heat treatment on the quality of high-nickel content stainless steel, improves the mechanical strength, ductility and corrosion resistance of high-nickel content stainless steel, and improves the manufacturing quality of high-nickel content stainless steel.

Description

Technical Field

[0001] The invention belongs to the technical field of stainless steel manufacturing, and in particular relates to a manufacturing process and application of stainless steel with high nickel content. Background Art

[0002] High nickel content stainless steel refers to a type of stainless steel with a nickel content of 20% to 25%. This type of stainless steel has the advantages of good oxidation resistance, corrosion resistance, high temperature resistance and wear resistance. It is widely used in the processing and manufacturing of high temperature equipment, chemical equipment, automotive industry and marine equipment.

[0003] At present, the common manufacturing process of high-nickel content stainless steel is to use electric furnace to dissolve waste 316L stainless steel and high-carbon ferrochrome raw materials into molten steel, and then remove impurities from the molten steel and adjust the composition for processing and manufacturing, or to use blast furnace molten iron and metal alloy raw materials for smelting. The processing and manufacturing process usually consists of several steps: selecting raw materials, smelting, hot rolling and heat treatment.

[0004] Among them, hot rolling is an important step in the manufacturing process of high-nickel stainless steel. The hot rolling process plays a vital role in the physical, chemical properties and corrosion resistance of high-nickel stainless steel. In the prior art, the manufacturing process of high-nickel stainless steel usually only uses hot working to process the smelted high-nickel stainless steel. The single hot working method makes the mechanical strength, ductility and corrosion resistance of high-nickel stainless steel poor, and the steel is prone to cracks, resulting in poor manufacturing quality of high-nickel stainless steel.

[0005] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0006] The purpose of the present invention is to provide a high-nickel content stainless steel manufacturing process and application, which can perform hot and cold mixing treatment on the high-nickel content stainless steel, thereby improving the mechanical strength, ductility and corrosion resistance of the high-nickel content stainless steel.

[0007] In order to achieve the above object, a technical solution provided by a specific embodiment of the present invention is as follows:

[0008] A high nickel content stainless steel manufacturing process comprises the following steps:

[0009] S1. Raw material preparation: obtaining scrap 316L stainless steel at a mass fraction of 3% to 8%, obtaining high carbon ferrochrome raw material at a mass fraction of 0.8% to 1.2%, mixing the two components of raw materials to obtain a stainless steel mixed raw material, and obtaining alloy elements at a mass fraction;

[0010] S2, smelting and pouring, adding the stainless steel mixed raw materials into a high-temperature electric furnace for smelting, melting the stainless steel mixed raw materials by high-temperature melting, then adding alloy elements to the molten stainless steel mixed raw materials, and continuously stirring them, and forming a stainless steel blank after secondary smelting;

[0011] S3, hot rolling treatment, using a high-temperature heating furnace to continuously heat the stainless steel blank, and using a step-by-step heating method to hot-roll the stainless steel blank to form a stainless steel slab with a high nickel content;

[0012] S4, cold rolling treatment, pickling, cold rolling, cold drawing and cold forging of the high nickel content stainless steel slab;

[0013] S5. Heat treatment processing, annealing, quenching and aging treatment are performed on the high nickel content stainless steel slab after cold forging to form high nickel content stainless steel.

[0014] In one or more embodiments of the present invention, the alloy elements include, by mass percentage: carbon (C) ≤ 0.08%, silicon (Si) ≤ 1.50%, manganese (Mn) ≤ 2.00%, phosphorus (P) ≤ 0.045%, sulfur (S) ≤ 0.030%, chromium (Cr) 24.00-26.00%, and nickel (Ni) 19.00-22.00%.

[0015] In one or more embodiments of the present invention, the stainless steel mixed raw material is subjected to blast furnace reduction and desulfurization treatment before smelting and pouring.

[0016] In one or more embodiments of the present invention, the melting temperature of the stainless steel mixed raw material is 1600°C to 1700°C, and the furnace temperature of the stainless steel blank is 1450°C to 1500°C.

[0017] In one or more embodiments of the present invention, the temperature of the secondary smelting is 1700° C. to 1750° C., and the alloy elements and the stainless steel mixed raw material are cooled after secondary smelting and then taken out of the furnace to form a stainless steel blank.

[0018] In one or more embodiments of the present invention, the hot rolling treatment includes hot rolling, hot drawing and hot forging, the step-by-step heating includes a hot rolling heating zone, a hot forging heating zone and a hot drawing heating zone, the temperature of the hot rolling heating zone is 1100°C to 1150°C, the zone width of the hot rolling heating zone is 6m, and the travel speed of the stainless steel blank in the hot rolling heating zone is 8 to 10m / h.

[0019] In one or more embodiments of the present invention, the temperature of the hot drawing heating zone is 1150°C to 1250°C, the zone width of the hot rolling heating zone is 6m, and the traveling speed of the stainless steel blank in the hot rolling heating zone is 8-10m / h.

[0020] In one or more embodiments of the present invention, the temperature of the hot forging heating zone is 1100°C to 900°C, the zone width of the hot rolling heating zone is 10m, and the traveling speed of the stainless steel blank in the hot rolling heating zone is 6-8m / h.

[0021] In one or more embodiments of the present invention, the cold rolling temperature is room temperature, the stainless steel slab is surface cleaned and impurities removed before pickling, and the pickling solution is a mixture of nitric acid and hydrofluoric acid.

[0022] The invention discloses an application of high-nickel content stainless steel prepared by a high-nickel content stainless steel manufacturing process in high-temperature equipment.

[0023] Compared with the prior art, the present invention manufactures high-nickel-content stainless steel by adopting cold-hot mixed treatment and heat treatment, which greatly reduces the adverse effects of heat treatment on the quality of high-nickel-content stainless steel, improves the mechanical strength, ductility and corrosion resistance of high-nickel-content stainless steel, and improves the manufacturing quality of high-nickel-content stainless steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a flow chart of a process for manufacturing stainless steel with high nickel content according to an embodiment of the present invention;

[0026] Figure 2 This is a ratio diagram of high nickel content stainless steel in one embodiment of the present invention;

[0027] Figure 3 A comparative parameter diagram of a stainless steel with a high nickel content in one embodiment of the present invention;

[0028] Figure 4 This is a performance comparison chart of high nickel content stainless steel in one embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0030] like Figures 1 to 4 As shown, a high nickel content stainless steel manufacturing process in one embodiment of the present invention includes the following steps:

[0031] S1. Raw material preparation: obtaining scrap 316L stainless steel according to 3% to 8% by mass, obtaining high carbon ferrochrome raw material according to 0.8% to 1.2% by mass, mixing the two components of raw materials to obtain a stainless steel mixed raw material, and at the same time, obtaining alloy elements according to mass fraction.

[0032] S2, smelting and pouring, the stainless steel mixed raw materials are subjected to blast furnace reduction and stripping treatment, and then the stainless steel mixed raw materials are added to a high-temperature electric furnace for smelting at a temperature of 1600° C. to 1700° C., the stainless steel mixed raw materials are melted by high-temperature melting, and then alloy elements are added to the molten stainless steel mixed raw materials, and the mixture is continuously stirred, mixed at a temperature of 1700° C. to 1750° C., and then smelted twice to form a stainless steel blank.

[0033] S3, hot rolling treatment, using a high-temperature heating furnace to continuously heat the stainless steel blank, and using a step-by-step heating method to hot-roll the stainless steel blank to form a stainless steel slab with a high nickel content.

[0034] The hot rolling treatment includes hot rolling, hot drawing and hot forging. The step-by-step temperature increase is the hot rolling heating zone, the hot forging heating zone and the hot drawing heating zone. The temperature of the hot rolling heating zone is 1100°C to 1150°C. The width of the hot rolling heating zone is 6m. The travel speed of the stainless steel blank in the hot rolling heating zone is 8 to 10m / h.

[0035] The temperature of the hot drawing heating zone is 1150°C to 1250°C, the zone width of the hot rolling heating zone is 6m, and the traveling speed of the stainless steel blank in the hot rolling heating zone is 8-10m / h.

[0036] The temperature of the hot forging heating zone is 1100° C. to 900° C., the zone width of the hot rolling heating zone is 10 m, and the traveling speed of the stainless steel blank in the hot rolling heating zone is 6 to 8 m / h.

[0037] S4, cold rolling treatment, the high nickel content stainless steel slab is pickled, cold rolled, cold drawn and cold forged.

[0038] The cold rolling temperature is room temperature, and the surface of the stainless steel slab is cleaned and impurities are removed before pickling. The pickling solution is a mixture of nitric acid and hydrofluoric acid.

[0039] S5. Heat treatment processing, annealing, quenching and aging treatment are performed on the high nickel content stainless steel slab after cold forging to form high nickel content stainless steel.

[0040] Specifically, the alloy elements include by mass percentage: carbon (C) ≤ 0.08%, silicon (Si) ≤ 1.50%, manganese (Mn) ≤ 2.00%, phosphorus (P) ≤ 0.045%, sulfur (S) ≤ 0.030%, chromium (Cr) 24.00-26.00%, and nickel (Ni) 19.00-22.00%.

[0041] Among them, low-carbon design helps to improve the toughness and weldability of high-nickel content stainless steel. By adding silicon, it helps to stabilize the combination and processing performance of stainless steel. By adding manganese, it is helpful to adjust the mechanical properties of steel. By adding phosphorus and sulfur elements, it is helpful to reduce the brittleness of steel and improve corrosion resistance. By adding chromium, excellent corrosion resistance is provided and the mechanical strength in high temperature environment is enhanced. By adding nickel, the corrosion resistance and cold formability are significantly improved, and the work hardening rate is reduced.

[0042] Embodiment 1

[0043] like Figures 2 to 3 As shown, a high nickel content stainless steel manufacturing process comprises the following steps:

[0044] S1. Raw material preparation: obtaining scrap 316L stainless steel at 8% by mass, obtaining high carbon ferrochrome raw material at 1.0% by mass, mixing the two components of raw materials to obtain a stainless steel mixed raw material, and obtaining alloy elements according to mass fraction;

[0045] Alloy elements are obtained by mass percentage including: carbon (C) ≤ 0.05%, silicon (Si) ≤ 1%, manganese (Mn) ≤ 2.00%, phosphorus (P) ≤ 0.035%, sulfur (S) ≤ 0.030%, chromium (Cr) 25.00%, and nickel (Ni) 20.00%;

[0046] S2, smelting and pouring, adding the stainless steel mixed raw materials into a high-temperature electric furnace for smelting, melting the stainless steel mixed raw materials by high-temperature melting, then adding alloy elements to the molten stainless steel mixed raw materials, and continuously stirring them, and forming a stainless steel blank after secondary smelting;

[0047] S3, hot rolling treatment, using a high-temperature heating furnace to continuously heat the stainless steel blank, and using a step-by-step heating method to hot-roll the stainless steel blank to form a stainless steel slab with a high nickel content;

[0048] The hot rolling treatment includes hot rolling, hot drawing and hot forging. The step-by-step heating is the hot rolling heating zone, the hot forging heating zone and the hot drawing heating zone. The temperature of the hot rolling heating zone is 1100°C, the zone width of the hot rolling heating zone is 6m, and the travel speed of the stainless steel blank in the hot rolling heating zone is 8-10m / h.

[0049] The temperature of the hot drawing heating zone is 1150°C, the zone width of the hot rolling heating zone is 6m, and the traveling speed of the stainless steel blank in the hot rolling heating zone is 8-10m / h.

[0050] The temperature of the hot forging heating zone is 1100°C, the area width of the hot rolling heating zone is 10m, and the travel speed of the stainless steel blank in the hot rolling heating zone is 6-8m / h;

[0051] S4, cold rolling treatment, pickling, cold rolling, cold drawing and cold forging of the high nickel content stainless steel slab;

[0052] S5. Heat treatment processing, annealing, quenching and aging treatment are performed on the high nickel content stainless steel slab after cold forging to form high nickel content stainless steel.

[0053] Embodiment 2

[0054] like Figures 2 to 3 As shown, a high nickel content stainless steel manufacturing process comprises the following steps:

[0055] S1. Raw material preparation: obtaining scrap 316L stainless steel at a mass fraction of 6%, obtaining high carbon ferrochrome raw material at a mass fraction of 1.2%, mixing the two components of raw materials to obtain a stainless steel mixed raw material, and obtaining alloy elements according to mass fraction;

[0056] Alloy elements are obtained by mass percentage including: carbon (C) ≤ 0.04%, silicon (Si) ≤ 1.5%, manganese (Mn) ≤ 1.80%, phosphorus (P) ≤ 0.045%, sulfur (S) ≤ 0.025%, chromium (Cr) 24.00%, and nickel (Ni) 21.00%;

[0057] S2, smelting and pouring, adding the stainless steel mixed raw materials into a high-temperature electric furnace for smelting, melting the stainless steel mixed raw materials by high-temperature melting, then adding alloy elements to the molten stainless steel mixed raw materials, and continuously stirring them, and forming a stainless steel blank after secondary smelting;

[0058] S3, hot rolling treatment, using a high-temperature heating furnace to continuously heat the stainless steel blank, and using a step-by-step heating method to hot-roll the stainless steel blank to form a stainless steel slab with a high nickel content;

[0059] The hot rolling treatment includes hot rolling, hot drawing and hot forging. The step-by-step temperature increase is the hot rolling heating zone, the hot forging heating zone and the hot drawing heating zone. The temperature of the hot rolling heating zone is 1125°C, the zone width of the hot rolling heating zone is 6m, and the travel speed of the stainless steel blank in the hot rolling heating zone is 8-10m / h.

[0060] The temperature of the hot drawing heating zone is 1200°C, the zone width of the hot rolling heating zone is 6m, and the traveling speed of the stainless steel blank in the hot rolling heating zone is 8-10m / h.

[0061] The temperature of the hot forging heating zone is 1050°C, the area width of the hot rolling heating zone is 10m, and the travel speed of the stainless steel blank in the hot rolling heating zone is 6-8m / h;

[0062] S4, cold rolling treatment, pickling, cold rolling, cold drawing and cold forging of the high nickel content stainless steel slab;

[0063] S5. Heat treatment processing, annealing, quenching and aging treatment are performed on the high nickel content stainless steel slab after cold forging to form high nickel content stainless steel.

[0064] Embodiment 3

[0065] like Figures 2 to 3 As shown, a high nickel content stainless steel manufacturing process comprises the following steps:

[0066] S1. Raw material preparation: obtaining scrap 316L stainless steel at a mass fraction of 5%, obtaining high carbon ferrochrome raw material at a mass fraction of 0.8%, mixing the two components of raw materials to obtain a stainless steel mixed raw material, and obtaining alloy elements according to mass fraction;

[0067] Alloy elements are obtained by mass percentage including: carbon (C) ≤ 0.06%, silicon (Si) ≤ 1.2%, manganese (Mn) ≤ 1.95%, phosphorus (P) ≤ 0.040%, sulfur (S) ≤ 0.020%, chromium (Cr) 26.00%, and nickel (Ni) 22.00%;

[0068] S2, smelting and pouring, adding the stainless steel mixed raw materials into a high-temperature electric furnace for smelting, melting the stainless steel mixed raw materials by high-temperature melting, then adding alloy elements to the molten stainless steel mixed raw materials, and continuously stirring them, and forming a stainless steel blank after secondary smelting;

[0069] S3, hot rolling treatment, using a high-temperature heating furnace to continuously heat the stainless steel blank, and using a step-by-step heating method to hot-roll the stainless steel blank to form a stainless steel slab with a high nickel content;

[0070] The hot rolling treatment includes hot rolling, hot drawing and hot forging. The step-by-step temperature increase is the hot rolling heating zone, the hot forging heating zone and the hot drawing heating zone. The temperature of the hot rolling heating zone is 1150°C, the zone width of the hot rolling heating zone is 6m, and the travel speed of the stainless steel blank in the hot rolling heating zone is 8-10m / h.

[0071] The temperature of the hot drawing heating zone is 1250°C, the zone width of the hot rolling heating zone is 6m, and the traveling speed of the stainless steel blank in the hot rolling heating zone is 8-10m / h.

[0072] The temperature of the hot forging heating zone is 1000°C, the width of the hot rolling heating zone is 10m, and the travel speed of the stainless steel blank in the hot rolling heating zone is 6-8m / h;

[0073] S4, cold rolling treatment, pickling, cold rolling, cold drawing and cold forging of the high nickel content stainless steel slab;

[0074] S5. Heat treatment processing, annealing, quenching and aging treatment are performed on the high nickel content stainless steel slab after cold forging to form high nickel content stainless steel.

[0075] Embodiment 4

[0076] like Figures 2 to 3 As shown, a high nickel content stainless steel manufacturing process comprises the following steps:

[0077] S1. Raw material preparation: obtaining scrap 316L stainless steel at a mass fraction of 3%, obtaining high carbon ferrochrome raw material at a mass fraction of 1.0%, mixing the two components of raw materials to obtain a stainless steel mixed raw material, and obtaining alloy elements according to mass fraction;

[0078] Alloy elements are obtained by mass percentage including: carbon (C) ≤ 0.08%, silicon (Si) ≤ 0.8%, manganese (Mn) ≤ 1.60%, phosphorus (P) ≤ 0.030%, sulfur (S) ≤ 0.015%, chromium (Cr) 25.00%, and nickel (Ni) 19.00%;

[0079] S2, smelting and pouring, adding the stainless steel mixed raw materials into a high-temperature electric furnace for smelting, melting the stainless steel mixed raw materials by high-temperature melting, then adding alloy elements to the molten stainless steel mixed raw materials, and continuously stirring them, and forming a stainless steel blank after secondary smelting;

[0080] S3, hot rolling treatment, using a high-temperature heating furnace to continuously heat the stainless steel blank, and using a step-by-step heating method to hot-roll the stainless steel blank to form a stainless steel slab with a high nickel content;

[0081] The hot rolling treatment includes hot rolling, hot drawing and hot forging. The step-by-step heating is the hot rolling heating zone, the hot forging heating zone and the hot drawing heating zone. The temperature of the hot rolling heating zone is 1100°C, the zone width of the hot rolling heating zone is 6m, and the travel speed of the stainless steel blank in the hot rolling heating zone is 8-10m / h.

[0082] The temperature of the hot drawing heating zone is 1225°C, the zone width of the hot rolling heating zone is 6m, and the traveling speed of the stainless steel blank in the hot rolling heating zone is 8-10m / h.

[0083] The temperature of the hot forging heating zone is 900°C, the area width of the hot rolling heating zone is 10m, and the travel speed of the stainless steel blank in the hot rolling heating zone is 6-8m / h;

[0084] S4, cold rolling treatment, pickling, cold rolling, cold drawing and cold forging of the high nickel content stainless steel slab;

[0085] S5. Heat treatment processing, annealing, quenching and aging treatment are performed on the high nickel content stainless steel slab after cold forging to form high nickel content stainless steel.

[0086] like Figure 4 As shown, in summary, the tensile strength of the high nickel content stainless steel in Example 1 is 510MPa, the extension strength is 200MPa, and the elongation is 35%; the tensile strength of the high nickel content stainless steel in Example 2 is 525MPa, the extension strength is 205MPa, and the elongation is 40%; the tensile strength of the high nickel content stainless steel in Example 3 is 505MPa, the extension strength is 195MPa, and the elongation is 38%; the tensile strength of the high nickel content stainless steel in Example 4 is 520MPa, the extension strength is 210MPa, and the elongation is 38%.

[0087] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0088] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A process for manufacturing stainless steel with high nickel content, characterized in that: The following steps are involved: S1. Raw material preparation: obtaining scrap 316L stainless steel at a mass fraction of 3% to 8%, obtaining high carbon ferrochrome raw material at a mass fraction of 0.8% to 1.2%, mixing the two components of raw materials to obtain a stainless steel mixed raw material, and obtaining alloy elements at a mass fraction; S2, smelting and pouring, adding the stainless steel mixed raw materials into a high-temperature electric furnace for smelting, melting the stainless steel mixed raw materials by high-temperature melting, then adding alloy elements to the molten stainless steel mixed raw materials, and continuously stirring them, and forming a stainless steel blank after secondary smelting; S3, hot rolling treatment, using a high-temperature heating furnace to continuously heat the stainless steel blank, and using a step-by-step heating method to hot-roll the stainless steel blank to form a stainless steel slab with a high nickel content; S4, cold rolling treatment, pickling, cold rolling, cold drawing and cold forging of the high nickel content stainless steel slab; S5. Heat treatment processing, annealing, quenching and aging treatment are performed on the high nickel content stainless steel slab after cold forging to form high nickel content stainless steel.

2. The process for manufacturing high nickel content stainless steel according to claim 1, characterized in that: The alloy elements include, by mass percentage: carbon (C) ≤ 0.08%, silicon (Si) ≤ 1.50%, manganese (Mn) ≤ 2.00%, phosphorus (P) ≤ 0.045%, sulfur (S) ≤ 0.030%, chromium (Cr) 24.00-26.00%, and nickel (Ni) 19.00-22.00%.

3. The process for manufacturing high nickel content stainless steel according to claim 1, characterized in that: The stainless steel mixed raw material is subjected to blast furnace reduction and desulfurization treatment before smelting and pouring.

4. The process for manufacturing high nickel content stainless steel according to claim 1, characterized in that: The melting temperature of the stainless steel mixed raw material is 1600°C to 1700°C, and the furnace-out temperature of the stainless steel blank is 1450°C to 1500°C.

5. The process for manufacturing high nickel content stainless steel according to claim 1, characterized in that: The temperature of the secondary smelting is 1700° C. to 1750° C. The alloy elements and the stainless steel mixed raw material are cooled after the secondary smelting and then taken out of the furnace to form a stainless steel blank.

6. The process for manufacturing high nickel content stainless steel according to claim 1, characterized in that: The hot rolling treatment includes hot rolling, hot drawing and hot forging. The step-by-step heating includes a hot rolling heating zone, a hot forging heating zone and a hot drawing heating zone. The temperature of the hot rolling heating zone is 1100° C. to 1150° C., the zone width of the hot rolling heating zone is 6 m, and the travel speed of the stainless steel blank in the hot rolling heating zone is 8 to 10 m / h.

7. The process for manufacturing high nickel content stainless steel according to claim 6, characterized in that: The temperature of the hot drawing heating zone is 1150° C. to 1250° C., the area width of the hot rolling heating zone is 6 m, and the traveling speed of the stainless steel blank in the hot rolling heating zone is 8 to 10 m / h.

8. The process for manufacturing high nickel content stainless steel according to claim 6, characterized in that: The temperature of the hot forging heating zone is 1100° C. to 900° C., the zone width of the hot rolling heating zone is 10 m, and the traveling speed of the stainless steel blank in the hot rolling heating zone is 6 to 8 m / h.

9. The process for manufacturing high nickel content stainless steel according to claim 1, characterized in that: The cold rolling temperature is room temperature, the stainless steel slab is surface cleaned and impurities removed before pickling, and the pickling solution is a mixture of nitric acid and hydrofluoric acid.

10. Use of high-nickel-content stainless steel prepared by the high-nickel-content stainless steel manufacturing process according to claims 1 to 9 in high-temperature equipment.

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