CN113492151B - Manufacturing method of iron-nickel-based alloy hot-rolled coil - Google Patents
Manufacturing method of iron-nickel-based alloy hot-rolled coil Download PDFInfo
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- CN113492151B CN113492151B CN202110808201.4A CN202110808201A CN113492151B CN 113492151 B CN113492151 B CN 113492151B CN 202110808201 A CN202110808201 A CN 202110808201A CN 113492151 B CN113492151 B CN 113492151B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
Abstract
The invention discloses a method for manufacturing an iron-nickel-based alloy hot-rolled coil, which comprises the following steps: (1) Loading the iron-nickel base alloy plate blank into a heating furnace, and sequentially treating the iron-nickel base alloy plate blank through a heating section and a soaking section of the heating furnace, wherein the furnace temperature of the heating section is 1200-1250 ℃, and the furnace temperature of the soaking section is 1250-1290 ℃; (2) Inputting the heated iron-nickel base alloy plate blank into a rough rolling unit and a finish rolling unit in sequence, and performing five-pass rough rolling and seven-pass finish rolling to obtain a hot-rolled coil; and (3) cooling and coiling the hot-rolled coil.
Description
Technical Field
The invention relates to the technical field of manufacturing of iron-nickel-based alloys, in particular to a method for manufacturing an iron-nickel-based alloy hot-rolled coil.
Background
The iron-nickel-based alloy has excellent comprehensive properties of high-temperature oxidation resistance, corrosion resistance and the like, and is widely applied to the fields of petrochemical industry, energy sources, heating and the like. With the rapid development of the industry, the demand of iron-nickel-based alloy products is increasing.
Because the iron-nickel base alloy contains more alloying elements, the casting blank is easy to generate solute segregation, the high-temperature deformation resistance is large, the thermal deformation activation energy is high, the recrystallization condition generated in the hot working process is harsh, meanwhile, the brittleness is increased due to the addition of the alloying elements and the precipitation of a complex second phase, the thermoplasticity of the alloy is poor, and the hot working process window is narrow. Therefore, for the iron-nickel-based alloy coil products, the die casting (cogging) or the slab continuous casting and the steckel mill are mainly adopted for rolling production in the prior art, and for the modern hot continuous rolling unit with higher rolling efficiency for rolling the iron-nickel-based coil, the method has the remarkable advantages of high production efficiency and good surface quality of the coil, but the hot rolled coil is easy to have edge crack, the yield is seriously influenced, even waste products are caused, and the larger economic loss is caused.
Disclosure of Invention
In view of the above problems, the present invention has been made in order to provide a method of manufacturing an iron-nickel based alloy hot rolled coil that overcomes or at least partially solves the above problems.
Specifically, the invention is realized by the following technical scheme:
a method for manufacturing an iron-nickel base alloy hot-rolled coil comprises the following steps:
(1) Loading the iron-nickel base alloy plate blank into a heating furnace, and sequentially treating the iron-nickel base alloy plate blank through a heating section and a soaking section of the heating furnace, wherein the furnace temperature of the heating section is 1200-1250 ℃, and the furnace temperature of the soaking section is 1250-1290 ℃;
(2) Inputting the heated iron-nickel base alloy plate blank into a rough rolling unit and a finishing rolling unit in sequence, and carrying out rough rolling and finish rolling to obtain a hot-rolled coil;
(3) And cooling and coiling the hot rolled coil.
Optionally, in the step (1), the time of the iron-nickel based alloy slab in the heating section and the soaking section is (0.45-0.65) × D min, wherein D is the thickness of the iron-nickel based alloy slab and the unit is millimeter.
Optionally, in the step (1), the residual oxygen amount of the heating furnace is less than or equal to 4 percent, and the mixed gas H 2 S content is less than or equal to 150mg/m 3 。
Optionally, in the step (2), during the rough rolling, the deformation amount of the first two passes is 20-25%, and the strain rate is 1.5-3.5 s -1 (ii) a The subsequent pass deformation is 30-35%, and the strain rate is 10.0-15.0 s -1 。
Optionally, in the step (2), the rough rolling start temperature is 1150-1180 ℃, and the rough rolling outlet temperature is 1120-1150 ℃.
Optionally, in the step (2), in the finish rolling process, the total deformation is less than or equal to 85 percent, the deformation of the first two times is 30 to 35 percent, and the strain rate is 5 to 10s -1 (ii) a The deformation of the third and fourth passes is 20-25%, and the strain rate is 15-25 s -1 (ii) a The subsequent pass deformation is 10-20%, and the strain rate is 30-50 s -1 。
Optionally, in the step (2), the finish rolling inlet temperature is more than or equal to 1000 ℃, and the finish rolling outlet temperature is 1000-1030 ℃.
Optionally, in step (2), a coil box is provided between the roughing mill train and the finishing mill train.
Optionally, the iron-nickel based alloy is an alloy with a designation NS 1101.
Compared with the prior art, the manufacturing method of the iron-nickel-based alloy hot-rolled coil has the following beneficial effects:
by reasonably matching the heating process, the atmosphere in the furnace, the rough rolling process parameters, the finish rolling process parameters and the like, the problem of edge crack of the hot continuous rolling iron-nickel base alloy coil is effectively solved, the yield is improved, the production cost is reduced, the production efficiency is improved, and the stable batch production of the iron-nickel base alloy hot rolling coil product is realized.
Detailed Description
The invention will be described in detail with reference to the following detailed description for fully understanding the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
Aiming at the defects existing in the production process of the iron-nickel base alloy hot rolled coil and the product quality problems caused by the process defects, the inventor of the invention carries out deep analysis and research on the production process and provides a manufacturing method of the iron-nickel base alloy hot rolled coil, and the manufacturing method is mainly based on the following research findings and inventive concepts:
by adopting a manufacturing process of a continuous casting slab and a hot continuous rolling unit, solute atoms segregated among dendrites in a casting blank are fully diffused and have uniform components by reasonably designing a casting blank heating system according to the hot processing characteristics of the alloy, so that the thermoplasticity of the casting blank raw material is improved; by reasonably designing the temperature in the rough rolling process and reasonably matching the deformation and the strain rate of each pass of the rough rolling, the full crushing of the as-cast structure and the full occurrence of dynamic recrystallization are ensured, and the intermediate blank has a uniform near-equiaxial crystal structure after the rough rolling is finished, so that a good tissue foundation is provided for finish rolling; and optimally designing the process parameters of each pass of finish rolling, providing a proper thermal deformation condition for the intermediate blank, so that the intermediate blank is thermally deformed under a thermal processing safety process window, and effectively preventing the thermal curling part from cracking.
Specifically, the manufacturing method of the iron-nickel-based alloy hot-rolled coil is particularly suitable for the alloy with the mark of NS1101, and the iron-nickel-based alloy hot-rolled coil comprises the following elements in percentage by weight:
less than or equal to 0.030 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 0.70 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.001 percent of S, 19.00-23.00 percent of Cr, 30.0-35.0 percent of Ni, 0.15-0.60 percent of Al, 0.15-0.60 percent of Ti, less than or equal to 0.50 percent of Cu, less than or equal to 0.010 percent of N, and the balance of iron and inevitable impurities.
Specifically, the manufacturing method of the iron-nickel-based alloy hot-rolled coil comprises the following steps:
(1) Heating of slabs
The manufacturing method of the invention has no special requirements on the plate blank, and the iron-nickel base alloy plate blank which meets the element composition can be applied to the manufacturing method of the invention. As a preferred embodiment, the "EAF + AOD + LF" method may be used to smelt iron-nickel-based alloys, and then continuously cast the smelted iron-nickel-based alloys to obtain continuous cast slabs, for example, by using a vertical slab caster, although other types of continuous casting equipment may be used. The thickness of the slab may be 160 to 180mm.
As a preferable embodiment, before heating the slab, full-surface grinding is performed on the surface of the continuous casting slab to grind off surface defects, and the grinding rate of the full-surface grinding may be 3.0% to 4.0%.
In a preferred embodiment, when heating the slab, the slab is charged into a heating furnace and sequentially subjected to a heating zone and a soaking zone of the heating furnace. The furnace may be a walking beam furnace, although this is exemplary only and other types of furnaces may be used in the present invention. The temperature in the heating zone of the heating furnace is 1200 to 1250 ℃, for example, 1200 ℃, 1210 ℃, 1220 ℃, 1230 ℃, 1240 ℃ or 1250 ℃. The temperature of the soaking section of the heating furnace is 1250 to 1290 ℃, for example 1250 ℃, 1260 ℃, 1270 ℃, 1280 ℃ or 1290 ℃ and the like. The time for processing the slab in the heating section and the soaking section of the heating furnace is determined according to the thickness of the slab, and is specifically (0.45-0.65) multiplied by D min, wherein D is the thickness of the iron-nickel base alloy slab and is a unit of millimeter. As for the time for the heating section and the soaking section to perform the treatment respectively, those skilled in the art can make a reasonable choice according to the actual production conditions.
As a preferred embodiment, the atmosphere in the furnace is selected to have a residual oxygen content of 4% by volume or less and the mixed gas H is mixed with the gas 2 S content is less than or equal to 150mg/m 3 . By limiting the atmosphere in the heating furnace, the degree of oxidation of the surface of the continuous casting slab can be reduced, the iron scale is prevented from being pressed in, and low-melting-point sulfide is prevented from being precipitated at grain boundaries to cause grain boundary embrittlement, so that the thermoplasticity of the alloy is reduced.
The inventors have made intensive studies on the hot workability of the iron-nickel based alloy and have devised the above-mentioned slab heating system. The temperatures of the heating section and the soaking section of the heating furnace are respectively set to be 1200-1250 ℃ and 1250-1290 ℃, and the time in the heating section and the soaking section is set to be (0.45-0.65) multiplied by D min, so that solute atoms segregated among dendrites in the slab are fully diffused and have uniform components, and the thermoplasticity of the slab raw material is improved.
(2) Slab rolling
Before rolling the plate blank, high-pressure water dephosphorization can be carried out on the plate blank output by the heating furnace, the descaling pressure is controlled to be 25-35 MPa, and 1 main descaling is carried out. And then, sequentially inputting the plate blank into a rough rolling unit and a finish rolling unit for rolling.
As a preferred embodiment, the rough rolling is set to 5 or 7 passes. Preferably, the rough rolling is set to 5 passes, the initial rolling temperature of the rough rolling is 1150-1180 ℃ (1150 ℃, 1160 ℃, 1170 ℃ or 1180 ℃ and the like), the deformation amount of the first two passes is 20-25% (e.g. 20%, 21%, 22%, 23%, 24% or 25% and the like), and the strain rate is controlled to be 1.5-3.5 s -1 (1.5s -1 、2.0s -1 、2.5s -1 、3.0s -1 Or 3.5s -1 Etc.); the deformation amount of the last three passes is 30-35% (e.g. 30%, 31%, 32%, 33%, 34%, or 35%), and the strain rate is controlled to be 10.0-15.0 s -1 (10.0s -1 、11.0s -1 、12.0s -1 、13.0s -1 、14.0s -1 Or 15.0s -1 Etc.), the rough rolling outlet temperature is 1120 ℃ to 1150 ℃ (for example, 1120 ℃, 1130 ℃, 1140 ℃,1150 ℃, etc.).
Through intensive research, the temperature in the rough rolling process is reasonably designed, and the deformation and the strain rate of each pass of rough rolling are reasonably matched, so that the fully crushed cast structure and the fully generated dynamic recrystallization are ensured, the uniform near-equiaxial crystal structure of the intermediate blank is ensured after the rough rolling is finished, and a good structure foundation is provided for finish rolling.
In a preferred embodiment, the finish rolling is performed in 7 passes, the total deformation of the finish rolling is controlled to be 85% or less, the deformation of the former two passes is controlled to be 30% to 35% (e.g., 30%, 31%, 32%, 33%, 34% or 35%, etc.), and the strain rate is controlled to be 5 to 10s -1 (5.0s -1 、6.0s -1 、7.0s -1 、8.0s -1 、9.0s -1 Or 10.0s -1 Etc.); the deformation of the third and fourth passes is 20-25% (e.g. 20%, 21%, 22%, 23%, 24% or 25%), and the strain rate is controlled to be 15-25 s -1 (15.0s -1 、16.0s -1 、17.0s -1 、18.0s -1 、19.0s -1 、20.0s -1 、21.0s -1 、22.0s -1 、23.0s -1 、24.0s -1 Or 25.0s -1 Etc.); the deformation of the fifth to seventh passes is 10 to 20 percent, and the strain rate is controlled to be between 30 and 50s -1 (30.0s -1 、31.0s -1 、32.0s -1 、33.0s -1 、34.0s -1 、35.0s -1 、36.0s -1 、37.0s -1 、38.0s -1 、39.0s -1 、40.0s -1 、41.0s -1 、42.0s -1 、43.0s -1 、44.0s -1 、45.0s -1 、46.0s -1 、47.0s -1 、48.0s -1 、49.0s -1 Or 50.0s -1 ). The inlet temperature of the finish rolling is not less than 1000 ℃ and the outlet temperature of the finish rolling is 1000 to 1030 ℃ (for example, 1000 ℃, 1010 ℃, 1020 ℃ or 1030 ℃ and the like).
The inventor optimizes and designs the process parameters of each pass of finish rolling through deep research, thereby providing proper thermal deformation conditions for the intermediate blank, enabling the intermediate blank to be thermally deformed under a safe hot processing process window, and effectively preventing the thermal curling part from cracking.
As a preferable embodiment, a coil box is put between the rough rolling and finishing rolling train, in order to improve the temperature uniformity of the whole coil of the iron-nickel based alloy and to allow time for dynamic recrystallization of the deformed structure of the cast slab after rolling, thereby providing a good thermoplastic structure basis for finish rolling.
(3) Cooling and coiling
And (3) putting the hot-rolled coil obtained in the step (2) into laminar cooling, and controlling the coiling temperature to be 650-700 ℃.
By adopting the manufacturing method of the invention, the iron-nickel base alloy coiled plate with the width of 1000-1250 mm and the thickness of 5.0-6.0 mm can be prepared.
By optimizing the heating system and the technological parameters of rough rolling and finish rolling and by means of the mutual promotion effect between the steps and the technology, good quality of the edge part and the surface of the rolled plate is realized.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
Example 1:
the NS1101 alloy is smelted by adopting an EAF, AOD and LF method, and then a vertical slab caster is adopted for continuous casting to obtain a continuous casting slab, wherein the section specification of the slab is 1245 multiplied by 180mm. And (3) grinding the surface of the continuous casting billet, wherein the grinding amount is 3.0%, and the thickness of the casting billet after grinding is 175mm.
Heating and preserving the temperature of the continuous casting slab by adopting a stepping heating furnace, wherein the furnace temperature of a heating section is 1230 ℃, and the furnace temperature of a soaking section is 127The time of the heating section and the soaking section is 95min at 0 ℃. Oxygen content in the furnace was 2.5%, H 2 The S content is 130mg/m 3 。
And removing oxide skin on the surface of the casting blank by adopting high-pressure phosphorus removal equipment, wherein the phosphorus removal pressure is 25MPa, and the phosphorus is removed for 1 channel mainly.
5 rough rolling passes are carried out, the initial rolling temperature is 1160 ℃, and the deformation and the strain rate of each pass are sequentially as follows: 23%/1.9s -1 ，25％/3.3s -1 ，33％/10.9s -1 ，33％/14.1s -1 ，30％/12.9s -1 The rough rolling outlet temperature is 1140 ℃, and the thickness of the rough rolled blank is 31.5mm.
And putting the hot coil box between the rough rolling mill group and the finishing rolling mill group.
And (3) carrying out finish rolling for 7 passes, wherein the total deformation of the finish rolling is 81%, the inlet temperature of the finish rolling is 1015 ℃, and the deformation and the strain rate of each pass are sequentially as follows: 33%/5.1s -1 ，31％/9.1s -1 ，25％/15.1s -1 ，20％/21.9s -1 ，15％/30.3s -1 ，11％/35.4s -1 ，10％/44.3s -1 The finish rolling outlet temperature was 1000 ℃.
And (4) after finishing the finish rolling, feeding laminar flow for cooling, wherein the coiling temperature is 670 ℃.
And 5 rolls of NS1101 alloy hot coils are continuously rolled, the thickness of the finished product is 6.0mm, and the hot coils have no edge crack and good surface quality through detection. After heat treatment, the grain size of the hot rolled plate is 6 grades, the structure is single austenite, and the structure performance is uniform.
Example 2:
NS1101 alloy is smelted by adopting an EAF + AOD + LF method, and then continuous casting is carried out by adopting a vertical slab caster to obtain a continuous casting slab, wherein the specification of the section of the slab is 1238 multiplied by 180mm. And (3) grinding the surface of the continuous casting blank, wherein the grinding amount is 3.5%, and the thickness of the casting blank after grinding is 172mm.
And heating and preserving heat of the continuous casting slab by using a stepping heating furnace, wherein the furnace temperature of a heating section is 1230 ℃, the furnace temperature of a soaking section is 1280 ℃, and the time of the heating section and the soaking section is 100min. Oxygen content in the furnace was 2.3%, H 2 The S content is 135mg/m 3 。
And removing oxide skin on the surface of the casting blank by adopting high-pressure phosphorus removal equipment, wherein the phosphorus removal pressure is 27MPa, and the phosphorus is removed for 1 channel mainly.
Rough rolling for 5 passes, wherein the initial rolling temperature is 1150 ℃, and the deformation and the strain rate of each pass are as follows in sequence: 23%/1.8s -1 ，25％/3.0s -1 ，34％/11.1s -1 ，34％/14.2s -1 ，32％/13.2s -1 The rough rolling outlet temperature is 1130 ℃, and the thickness of the rough rolled blank is 30mm.
And putting the hot coil box between the rough rolling mill group and the finishing mill group.
And (3) carrying out finish rolling for 7 passes, wherein the total deformation of the finish rolling is 83%, the inlet temperature of the finish rolling is 1010 ℃, and the deformation and the strain rate of each pass are sequentially as follows: 32%/5.1s -1 ，33％/9.4s -1 ，23％/15.4s -1 ，21％/21.7s -1 ，19％/35.4s -1 ，18％/46.8s -1 ，11％/48.8s -1 The finish rolling outlet temperature was 1010 ℃.
And (4) after finishing the finish rolling, feeding laminar flow for cooling, wherein the coiling temperature is 670 ℃.
The NS1101 alloy hot coil with 6 coils rolled continuously has the finished product thickness of 5.0mm, and the hot coil has no edge crack and good surface quality through detection. After heat treatment, the grain size of the hot rolled plate is 5.5 grade, the structure is single austenite, and the structure performance is uniform.
Example 3:
NS1101 alloy is smelted by adopting an EAF + AOD + LF method, and then continuous casting is carried out by adopting a vertical slab caster to obtain a continuous casting slab, wherein the specification of the section of the slab is 1238 multiplied by 160mm. And (3) grinding the surface of the continuous casting blank, wherein the grinding amount is 4.0%, and the thickness of the casting blank after grinding is 153mm.
And heating and preserving heat of the continuous casting slab by using a stepping heating furnace, wherein the furnace temperature of a heating section is 1250 ℃, the furnace temperature of a soaking section is 1280 ℃, and the time of the heating section and the soaking section is 90min. Oxygen content in the furnace was 2.5%, H 2 The S content is 138mg/m 3 。
And removing oxide skin on the surface of the casting blank by adopting high-pressure dephosphorization equipment, wherein the dephosphorization pressure is 29MPa, and 1 way of dephosphorization is mainly carried out.
5 rough rolling passes are carried out, the initial rolling temperature is 1160 ℃, and the deformation and the strain rate of each pass are sequentially as follows: 20%/1.8s -1 ，22％/3.2s -1 ，32％/10.4s -1 ，31％/13.2s -1 ，30％/12.9s -1 The rough rolling outlet temperature is 1130 ℃, and the thickness of the rough rolled blank is 31.5mm.
And putting the hot coil box between the rough rolling mill group and the finishing rolling mill group.
And (3) carrying out finish rolling for 7 passes, wherein the total deformation of the finish rolling is 83%, the inlet temperature of the finish rolling is 1020 ℃, and the deformation and the strain rate of each pass are sequentially as follows: 32%/5.1s -1 ，33％/9.5s -1 ，25％/16.4s -1 ，24.4％/21.7s -1 ，19％/36.5s -1 ，16％/45.4s -1 ，10％/49.1s -1 And the outlet temperature of the finish rolling is 1000 ℃.
And after finishing the finish rolling, feeding laminar cooling, wherein the coiling temperature is 680 ℃.
The NS1101 alloy hot coil with 5 coils rolled continuously has the thickness of a finished product of 5.0mm, and the hot coil has no edge crack and good surface quality through detection. After heat treatment, the grain size of the hot rolled plate is 6 grades, the structure is single austenite, and the structure performance is uniform
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other substitutions, modifications, combinations, changes, simplifications, etc., which are made without departing from the spirit and principle of the present invention, should be construed as equivalents and included in the protection scope of the present invention.
Claims (2)
1. A manufacturing method of an iron-nickel base alloy hot rolling coiled plate is characterized by comprising the following steps:
(1) Loading the iron-nickel base alloy plate blank into a heating furnace, and sequentially treating the iron-nickel base alloy plate blank through a heating section and a soaking section of the heating furnace, wherein the furnace temperature of the heating section is 1200-1250 ℃, the furnace temperature of the soaking section is 1270-1290 ℃, and the time of the iron-nickel base alloy plate blank in the heating section and the soaking section is (0.45-0.65) multiplied by D min, wherein D is the thickness of the iron-nickel base alloy plate blank and the unit is millimeter; wherein the residual oxygen content of the heating furnace is less than or equal to 4 percent, and the mixed gas H 2 S content is less than or equal to 150mg/m 3 ；
(2) Inputting the heated iron-nickel base alloy plate blank into a rough rolling unit and a finishing rolling unit in sequence, and carrying out 5 or 7 times of rough rolling and 7 times of finish rolling to obtain a hot-rolled coil;
(3) Cooling and coiling the hot-rolled coil;
wherein the iron-nickel base alloy comprises the following elements: less than or equal to 0.030 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 0.70 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.001 percent of S, 19.00-23.00 percent of Cr, 30.0-35.0 percent of Ni, 0.15-0.60 percent of Al, 0.15-0.60 percent of Ti, less than or equal to 0.50 percent of Cu, less than or equal to 0.010 percent of N, and the balance of iron and inevitable impurities;
wherein, in the step (2), the initial rolling temperature of rough rolling is 1150-1180 ℃, the outlet temperature of rough rolling is 1120-1150 ℃, the deformation of the first two passes is 20-25% and the strain rate is 1.5-3.5 s in the rough rolling process -1 (ii) a The subsequent pass deformation is 30-35%, and the strain rate is 10.0-15.0 s -1 ；
Wherein in the step (2), the inlet temperature of the finish rolling is more than or equal to 1000 ℃, the outlet temperature of the finish rolling is 1000-1030 ℃, the total deformation is less than or equal to 85 percent, the deformation of the first two times is 30-35 percent, and the strain rate is 5-10 s -1 (ii) a The deformation of the third and fourth passes is 20-25%, and the strain rate is 15-25 s -1 (ii) a The subsequent pass deformation is 10-20%, and the strain rate is 30-50 s -1 。
2. The method of manufacturing an iron-nickel base alloy hot rolled coil as claimed in claim 1, wherein in step (2), a coil box is provided between the roughing train and the finishing train.
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