Forging method of 06Cr18Ni11Ti
By mixing raw material components and precisely controlling the forging temperature, the problem of complex phase precipitation of Cr-Ni austenitic stainless steel during high-temperature forging is solved, and the tensile strength and yield strength of 06Cr18Ni11Ti material are improved, as well as the consideration of corrosion resistance and plasticity.
Patent Information
- Application Number
- CN202411789810.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-03-11
AI Technical Summary
Cr-Ni austenitic stainless steel is prone to precipitate complex phases, such as Cr23C6, σ phase and Laves phase, resulting in a decrease in the corrosion resistance and plasticity of the material.
By mixing raw material components, the Ti content is increased to reduce the precipitation of Cr23C6, and the temperature is always higher than 800℃ during the forging process to avoid the precipitation of complex phases. At the same time, technical means such as multi-fire forging, water-cooling treatment, thermal insulation coatings and channel-type induction heaters are used to accurately control the forging temperature and reduce the precipitation of complex phases.
It effectively improves the tensile strength and yield strength of 06Cr18Ni11Ti material, while taking into account the corrosion resistance and plasticity of the material, significantly improving the performance of the material.
Smart Images
Figure CN119592774A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of stainless steel forging, in particular to a forging method of 06Cr18Ni11Ti. Background Art
[0002] Cr-Ni austenitic stainless steel, also known as 304 stainless steel or 18-8 stainless steel, is a commonly used austenitic stainless steel. It has excellent corrosion resistance, good mechanical properties and oxidation resistance. It has been widely used in the fields of petroleum, chemical industry, nuclear power, etc.
[0003] However, the strength and hardness of Cr-Ni austenitic stainless steel are relatively low, and it is not suitable for equipment or components that bear heavy loads and have requirements for hardness and wear resistance. The strength of Cr-Ni austenitic stainless steel can be improved by cold deformation. However, the temperature of cold deformation strengthening is low, the plasticity of the material is low, the internal stress of the strengthened material increases, and the internal deformation is uneven. Therefore, the temperature of the material is increased, and warm deformation is used to strengthen Cr-Ni austenitic stainless steel. The commonly used warm deformation forging temperature is 200-800℃. When Cr-Ni austenitic stainless steel is between 450 and 800℃, a large number of complex phases will precipitate, such as Cr23C6, σ phase, Laves phase, etc. Among them, Cr23C6 causes chromium depletion at the grain boundary and reduces corrosion resistance. σ phase and Laves phase are hard and brittle phases, which deteriorate the plasticity of the material.
[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention
[0005] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a forging method of 06Cr18Ni11Ti, so as to improve the tensile strength and yield strength of 06Cr18Ni11Ti while taking into account the corrosion resistance and plasticity of the material.
[0006] The technical solution of the present invention is as follows:
[0007] A forging method of 06Cr18Ni11Ti comprises the following steps:
[0008] Raw material smelting steps: prepare raw material components, counted by weight percentage: C: 0.06-0.08%, Mn: 1.8-2.0%, Ti: 0.55-0.7%;
[0009] The first forging step: forging the forgings in multiple fires, stretching and upsetting the forgings; the forging temperature is 1130-1230°C, and the final forging temperature of each fire is greater than 850°C;
[0010] The first heat treatment step: after forging, put into water and cool to below 260°C;
[0011] Surface treatment step: coating the surface of the forging with a thermal insulation coating;
[0012] The second forging step: performing warm pressing deformation on the forging; the forging temperature is 800-850°C, and the final forging temperature is greater than 800°C; during the forging process, the temperature of the forging is monitored and the forging is supplemented with temperature;
[0013] The second heat treatment step: the forging is subjected to residual heat solution treatment and then cooled in water to below 260°C.
[0014] A further technical solution is that when executing the second forging step, a channel-type induction heater is arranged on the forging; when the second forging step starts, the distance between the forging and the channel-type induction heater is ≤10mm; the second forging step lengthens the forging, and the deformation of the forging is 30-40%.
[0015] A further technical solution is to use a temperature measuring gun to monitor the temperature of the forging; during the first forging step, measure the temperature of the forging at intervals of 3 minutes; during the second forging step, continuously measure the temperature of the forging.
[0016] A further technical solution is that the raw material components after preparation are counted by weight percentage: C: 0.06-0.08%, Mn: 1.8-2.0%, P: ≤0.03%, S: ≤0.003%, Si: ≤0.5%, Cr: 18.0-19.0%, Ni: 9.0-12.0%, Ti: 0.55-0.7%, B: ≤0.0018%, Co: ≤0.06%, O: ≤35ppm, H: ≤2ppm, and the balance is Fe and impurities.
[0017] Its further technical solution is that the first forging step includes a first fire; the first fire is to lightly roll the outer circle to lengthen and upset the forging; the anvil angle during the rolling process is 5-10°, and the anvil amount is 150-200mm; the upsetting pressing rate is 10-20mm / s; the forging temperature of the first fire is 1220-1230°C, the single forging pressing amount is 5%-10% of the diameter of the forging, and the deformation rate is 30-40mm / s; the deformation amount of the first fire is 40-50%, the forging ratio is 1.7-2.2, and after forging, the furnace is returned to the furnace for insulation at 1150-1160°C, and the furnace insulation time is 1-1.2min / mm.
[0018] Its further technical solution is that the first forging step includes a second fire; the second fire stretches the forging, and the stretching ratio is 1.5 to 2.0; the forging temperature of the second fire is 1150 to 1160°C, and after the second fire forging, the forging is returned to the furnace for insulation at 1150 to 1160°C, and the return to the furnace for insulation time is 0.2 to .03 min / mm.
[0019] Its further technical solution is that the second fire adopts FM method for drawing, the single forging pressure is controlled at 15-20%, and the deformation rate is controlled at 30-50mm / s; the anvil width ratio during forging is 0.4-0.7, and the anvil connection amount is 100-150mm.
[0020] Its further technical solution is that the first forging step includes a third fire; the third fire upsetting the forging, the pressing rate is 30-40 mm / s, the deformation is 40-50%, and the forging ratio is 1.7-2.2; the forging temperature of the third fire is 1150-1160°C, and after forging, the temperature is returned to the furnace for insulation at 1150-1160°C, and the return to the furnace for insulation time is 0.2-0.4 min / mm.
[0021] Its further technical solution is that the first forging step includes a fourth fire; the fourth fire uses upper and lower anvils to lengthen the forging, the anvil width is 400mm, the pressing rate is 50-70mm / s, the single deformation is 10-15%, and the total deformation is 30-60%; the forging temperature of the fourth fire is 1130-1140℃, and 30-40% deformation is left.
[0022] A further technical solution is that in the first heat treatment step and the second heat treatment step, the water cooling time of the forging is ≤90s.
[0023] The beneficial technical effects of the present invention are as follows
[0024] (1) The forging method of 06Cr18Ni11Ti in the present invention firstly prepares the composition of the raw materials before forging. Compared with ordinary 06Cr18Ni11Ti, the Ti content in the raw materials is increased to solidify C, so as to reduce the precipitation of Cr23C6, thereby reducing the influence of Cr23C6 on the corrosion resistance of the forging. During the forging process, the forging temperature is always controlled to be higher than 800°C, so as to avoid the forging temperature falling into the range of 450-800°C to precipitate complex phases, thereby avoiding the influence of these complex phases on the forging performance. During the forging process, the forging is cooled by water cooling. Water cooling cools down rapidly, reducing the time that the forging stays in the temperature range of 450-800°C. At the same time, during the forging process, a thermal insulation coating is applied to the surface of the forging. The temperature of the forging is monitored and the forging is supplemented in real time to ensure the temperature of the forging. Through water cooling, thermal insulation coating, temperature monitoring and supplementation, the temperature of the forging of 06Cr18Ni11Ti material during the forging process is accurately controlled, greatly reducing the precipitation of complex phases in the forging. Forging improves the tensile strength and yield strength of forgings made of 06Cr18Ni11Ti material while taking into account the corrosion resistance and plasticity of the forgings.
[0025] (2) Furthermore, the temperature of the forging is supplemented by a channel induction heater. The channel induction heater can be arranged around the forging to supplement the temperature of the forging evenly in the circumferential direction, ensure the uniform temperature of the forging, and guarantee the forging effect of the forging. Moreover, the channel induction heater directly heats the metal through an electromagnetic field, which can achieve uniform heating. The channel induction heater does not need to contact the forging and will not affect the forging of the forging.
[0026] (3) Furthermore, the forging process includes multiple firings. By performing multiple firings forging, the temperature of the material can be better controlled, ensuring that the forging is processed within a preset temperature range, and reducing the precipitation of complex phases in the forging. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 A flow chart of the forging method of 06Cr18Ni11Ti of the present invention is shown.
[0028] Figure 2 The phase transformation curve of 06Cr18Ni11Ti in the forging method of 06Cr18Ni11Ti of the present invention is shown.
[0029] Figure 3 The figure shows the grain size detection diagram of the forging obtained by the forging method of 06Cr18Ni11Ti of the present invention.
[0030] Figure 4 The non-metallic inclusion diagram in the end frame obtained by the forging method of 06Cr18Ni11Ti of the present invention is shown.
[0031] Figure 5The intergranular corrosion test specimen of the forging obtained by the forging method of 06Cr18Ni11Ti of the present invention is shown. DETAILED DESCRIPTION
[0032] In order to make the purpose, technical scheme and advantages of the present invention clearer, the device proposed by the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings adopt a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated by the accompanying drawings of this specification are only used to match the content disclosed in the specification, so that people familiar with this technology can understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they do not have technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.
[0033] In the description of the present invention, the orientations or positional relationships indicated by terms such as “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, and “circumferential” are defined as orientations or positional relationships based on those shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.
[0034] Figure 1 A flow chart showing the forging method of 06Cr18Ni11Ti of the present invention is shown in FIG. Figure 1 The forging method of 06Cr18Ni11Ti comprises the following steps:
[0035] S1. Raw material smelting step: prepare the raw material components, and the prepared raw material components are counted by weight percentage: C: 0.06-0.08%, Mn: 1.8-2.0%, P: ≤0.03%, S: ≤0.003%, Si: ≤0.5%, Cr: 18.0-19.0%, Ni: 9.0-12.0%, Ti: 0.55-0.7%, B: ≤0.0018%, Co: ≤0.06%, O: ≤35ppm, H: ≤2ppm, and the balance is Fe and impurities. Compared with ordinary 06Cr18Ni11Ti, this raw material smelting step increases the Ti content in the raw material and solidifies C to reduce the precipitation of Cr23C6 in the forging during the subsequent forging process, thereby reducing the influence of Cr23C6 on the corrosion resistance of the forging.
[0036] Figure 2 The phase transformation curve of 06Cr18Ni11Ti in the forging method of 06Cr18Ni11Ti of the present invention is shown in FIG. Figure 2 The phase diagram was fitted using Jmat software, from which the complex phase precipitation of 06Cr18Ni11Ti at different temperatures can be obtained.
[0037] S2. The first forging step: forging the forgings in multiple fires, stretching and upsetting the forgings. Forging by multiple fires can better control the temperature of the material, ensure that the forgings are processed within the preset temperature range, and reduce the precipitation of complex phases in the forgings. The forging temperature is 1130-1230°C, and the final forging temperature of each fire is >850°C. The forging temperature in the first forging step is always set to be greater than 850°C to prevent the temperature of the forgings from falling into the temperature range of 450-800°C, thereby preventing the forgings from precipitating a large number of complex phases in the temperature range of 450-800°C, and preventing the forgings from being affected by the complex phases. Referring to the weight of the forgings, a 20MN free forging fast forging equipment is used for forging in the first forging step. Compared with the transmission forging machine tool, the free forging fast forging equipment has high forging efficiency, which can greatly shorten the production cycle and improve production efficiency. In addition, the free forging block segment machine has an ideal temperature deformation effect, a high forming rate of forgings, and a high yield rate.
[0038] Specifically, the first forging step includes:
[0039] (1) First fire: The first fire is to lightly roll the outer circle to lengthen and upset the forging. The anvil angle during the rolling process is 5-10°, and the anvil amount is 150-200mm. The upsetting pressure rate is 10-20mm / s. The forging temperature of the first fire is 1220-1230℃, the single forging pressure is 5%-10% of the forging diameter, and the deformation rate is 30-40mm / s. The deformation of the first fire is 40-50%, and the forging ratio is 1.7-2.2. Make the forging fully deformed, reduce the work hardening during the deformation process of the forging, reduce the deformation resistance of the forging, ensure that the plastic deformation of the ingot body is fully compacted, and forge metallurgical defects are forged. After forging, return to the furnace at 1150-1160℃ for insulation, and the return to the furnace for insulation time is 1-1.2min / mm.
[0040] (2) Second fire: The second fire is used to draw the forging, and the drawing ratio is 1.5-2.0. The forging temperature of the second fire is 1150-1160℃. After the second fire forging, the forging is returned to the furnace at 1150-1160℃ for insulation, and the return and insulation time is 0.2-0.03min / mm.
[0041] Among them, the second fire adopts FM method to stretch to avoid the Mannesmann effect during forging and ensure that no tensile stress is generated in the core of the forging. The single forging pressure is controlled at 15-20%, and the deformation rate is controlled at 30-50mm / s. The anvil width ratio during forging is 0.4-0.7, and the anvil connection amount is 100-150mm.
[0042] (3) Third fire: The third fire is forging the whole upsetting forging, the pressing rate is 30-40 mm / s, the deformation is 40-50%, and the forging ratio is 1.7-2.2. The forging temperature of the third fire is 1150-1160℃, and after forging, the furnace is returned to the furnace for insulation at 1150-1160℃, and the furnace insulation time is 0.2-0.4 min / mm.
[0043] (4) Fourth fire: The fourth fire uses upper and lower anvils to lengthen the forgings, the anvil width is 400mm, the pressing rate is 50-70mm / s, the single deformation is 10-15%, and the deformation rate is 30-60% to achieve the purpose of grain refinement. The forging temperature of the fourth fire is 1130-1140℃, and 30-40% deformation is left.
[0044] During the forging process, when the anvil angle, anvil amount, pressing rate and deformation rate are too large, cracks are likely to occur on the surface of the forging; when these indicators are too small, the forging rate of the forging is affected. Clarifying the range of the above indicators can not only effectively control the occurrence of surface cracks, but also ensure that the entire forging is within a reasonable plastic deformation range, which is particularly effective in ensuring the forging quality of the forging. In addition, during the first forging process, the temperature of the forging is detected by a temperature measuring gun, and the detection frequency is 3 minutes / time. Avoid the temperature of the forging deviating from the preset temperature range.
[0045] S3. First heat treatment step: Cooling time ≤ 90s. Rapidly cool the forgings to reduce the time the forgings stay in the temperature range of 450-800°C. That is, reduce the precipitation of complex phases in the forgings.
[0046] S4. Surface treatment steps: Pre-process the upper and lower surfaces of the forgings so that the upper and lower surfaces of the forgings are flat and parallel to each other, which is convenient for the subsequent forging and shaping of the forgings. The surface of the forgings is coated with thermal insulation coating, and the thermal insulation material uses ATP-60 water-based protective coating. By coating the surface of the forgings with thermal insulation coating, the rate of temperature reduction of the forgings is effectively reduced, allowing the forgings to stay in the preset temperature range for a longer time during the forging process. After the thermal insulation coating of the forgings is applied, the forgings are placed in a warm charging furnace, and the forgings are heated to 920±10℃ by a heating resistance furnace, and the heating time is 0.3min / mm.
[0047] S5. Second forging step: Use a 36MN free forging fast forging machine and a deformation die to perform warm pressure deformation on the forging. The forging temperature is 800-850℃, and the final forging temperature is greater than 800℃. When performing the second forging step, a channel induction heater is set on the forging. The channel induction heater can be set around the forging to evenly supplement the temperature of the forging in the circumferential direction, ensure the uniform temperature of the forging, and ensure the forging effect of the forging. In addition, the channel induction heater directly heats the metal through an electromagnetic field, which can achieve uniform heating. The channel induction heater does not need to contact the forging and will not affect the forging of the forging. The temperature of the forging is continuously monitored by a temperature measuring gun, and the forging is supplemented in real time by a channel induction heater. Through water cooling, thermal insulation coating, temperature monitoring and supplementary temperature, the temperature of the forging of 06Cr18Ni11Ti material during the forging process is accurately controlled, greatly reducing the precipitation of complex phases in the forging. While forging improves the tensile strength and yield strength of the forging of 06Cr18Ni11Ti material, the corrosion resistance and plasticity of the forging are taken into account. The second forging step stretches the forging, and the deformation of the forging is 30-40%. At the beginning of the second forging step, the distance between the forging and the channel induction heater is ≤10mm. To avoid the subsequent forgings becoming thinner after forging, the distance between the forging and the channel induction heater is too far, which affects the heating effect of the forging.
[0048] S6. Second heat treatment step: forging residual heat solution treatment, the forging as a whole is returned to the furnace at 920℃±10℃ for 15-20min. Then it is cooled in water to below 260℃, and the water immersion time is ≤90s. The forging is completed.
[0049] Comprehensive mechanical testing and comparison of forgings: Results Table 1.
[0050]
[0051] It can be concluded from Table 1 that the forgings obtained by the present application meet the acceptance requirements in terms of tensile strength and yield strength, and the elongation after fracture and the cross-sectional shrinkage are significantly better than those of other control groups, indicating good plasticity.
[0052] Microscopic inspection of forgings:
[0053] Figure 3 The grain size detection diagram of the forging obtained by the forging method of 06Cr18Ni11Ti of the present invention is shown, please refer to Figure 3 Grain size detection: As shown in the figure, under a 150x electron microscope, the grain size sample at T / 2 was observed and the grain size was 5.5.
[0054] Figure 4 The non-metallic inclusion diagram in the end frame obtained by the forging method of 06Cr18Ni11Ti of the present invention is shown, please refer to Figure 4 . Under 150 times electron microscope, no Cr23C6, σ phase, Laves phase, etc. were found.
[0055] Figure 5 The intergranular corrosion test specimen of the forging obtained by the forging method of 06Cr18Ni11Ti of the present invention is shown in FIG. Figure 5 Take a 70mm*10mm*5mm intergranular corrosion sample and keep it at 700℃±10℃ for 30min, then slowly cool it to 500℃ at a rate of 60℃±5℃ in the furnace and then air cool it. Observe its curved outer surface through a 10× microscope. The sample makes a crisp metallic sound during the hammer test, and no cracks or tears appear in the bending test. It meets the corrosion test requirements.
[0056] It can be seen that the forging method of 06Cr18Ni11Ti can accurately control the temperature of the forging process of 06Cr18Ni11Ti material through water cooling, thermal insulation coating, temperature monitoring and temperature supplementation, greatly reducing the precipitation of complex phases in the forging. While forging improves the tensile strength and yield strength of the forging of 06Cr18Ni11Ti material, it also takes into account the corrosion resistance and plasticity of the forging.
[0057] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0058] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.
Claims
1. A forging method of 06Cr18Ni11Ti, characterized in that: The steps include: Raw material smelting steps: Prepare the raw material ingredients, count by weight percentage: C: 0.06-0.08%, Mn: 1.8~2.0%, Ti: 0.55~0.7%; The first forging step: forging the forgings in multiple fires, stretching and upsetting the forgings; the forging temperature is 1130-1230°C, and the final forging temperature of each fire is greater than 850°C; The first heat treatment step: after forging, put into water and cool to below 260°C; Surface treatment step: coating the surface of the forging with a thermal insulation coating; The second forging step: performing warm pressing deformation on the forging; the forging temperature is 800-850°C, and the final forging temperature is greater than 800°C; during the forging process, the temperature of the forging is monitored and the forging is supplemented with temperature; The second heat treatment step: the forging is subjected to residual heat solution treatment and then cooled in water to below 260°C.
2. The forging method of 06Cr18Ni11Ti according to claim 1, characterized in that: When performing the second forging step, a channel induction heater is arranged on the forging; when the second forging step starts, the distance between the forging and the channel induction heater is ≤10mm; the second forging step lengthens the forging, and the deformation of the forging is 30-40%.
3. The forging method of 06Cr18Ni11Ti according to claim 1, characterized in that: The temperature of the forging is monitored by a temperature measuring gun; during the first forging step, the temperature of the forging is measured at intervals of 3 minutes; During the second forging step, the temperature of the forged piece is continuously measured.
4. The forging method of 06Cr18Ni11Ti according to claim 1, characterized in that: The components of the prepared raw materials are counted by weight percentage: C: 0.06-0.08%, Mn: 1.8-2.0%, P: ≤0.03%, S: ≤0.003%, Si: ≤0.5%, Cr: 18.0-19.0%, Ni: 9.0-12.0%, Ti: 0.55-0.7%, B: ≤0.0018%, Co: ≤0.06%, O: ≤35ppm, H: ≤2ppm, and the balance is Fe and impurities.
5. The forging method of 06Cr18Ni11Ti according to claim 1, characterized in that: The first forging step includes a first fire; the first fire is to lightly roll the outer circle to lengthen and upset the forging; the anvil angle during the rolling process is 5-10°, and the anvil amount is 150-200mm; the upsetting pressing rate is 10-20mm / s; the forging temperature of the first fire is 1220-1230°C, the single forging pressing amount is 5%-10% of the diameter of the forging, and the deformation rate is 30-40mm / s; the deformation amount of the first fire is 40-50%, the forging ratio is 1.7-2.2, and after forging, the forging is returned to the furnace for insulation at 1150-1160°C, and the return and insulation time is 1-1.2min / mm.
6. The forging method of 06Cr18Ni11Ti according to claim 1, characterized in that: The first forging step includes a second fire; the second fire stretches the forging, and the stretching ratio is 1.5 to 2.0; the forging temperature of the second fire is 1150 to 1160°C, and after the second fire forging, the forging is returned to the furnace for insulation at 1150 to 1160°C, and the return to the furnace for insulation time is 0.2 to .03 min / mm.
7. The forging method of 06Cr18Ni11Ti according to claim 6, characterized in that: The second fire adopts FM method for drawing, the single forging pressure is controlled at 15-20%, and the deformation rate is controlled at 30-50 mm / s; the anvil width ratio during forging is 0.4-0.7, and the anvil connection amount is 100-150 mm.
8. The forging method of 06Cr18Ni11Ti according to claim 1, characterized in that: The first forging step includes a third fire; the third fire upsetting the forging, the pressing rate is 30-40 mm / s, the deformation is 40-50%, and the forging ratio is 1.7-2.2; the forging temperature of the third fire is 1150-1160°C, and after forging, the furnace is returned to the temperature of 1150-1160°C for insulation, and the furnace return insulation time is 0.2-0.4 min / mm.
9. The forging method of 06Cr18Ni11Ti according to claim 1, characterized in that: The first forging step includes a fourth fire; the fourth fire uses upper and lower anvils to lengthen the forging, the anvil width is 400mm, the pressing rate is 50-70mm / s, the single deformation is 10-15%, and the total deformation is 30-60%; the forging temperature of the fourth fire is 1130-1140°C, and 30-40% of the deformation is left.
10. The forging method of 06Cr18Ni11Ti according to claim 1, characterized in that: In the first heat treatment step and the second heat treatment step, the water cooling time of the forging is ≤90s.