Forming method of large-diameter thin-wall high-barrel type ultrahigh-strength steel D406A ring forging

Abstract

The invention discloses a forming method of a large-diameter thin-wall high-barrel type ultrahigh-strength steel D406A ring forging, and belongs to the technical field of high-strength steel forming. According to the technical scheme, the method is characterized by comprising the following steps that S1, blanking is performed, and a blank is obtained; S2, the blank is upset into a cake, and punching is performed; S3, a ring blank is obtained through blank making; S4, the ring blank is rolled into a ring; S5, heat treatment is performed on the ring blank; S6, physical and chemical detection is performed on the ring blank; S7, spheroidizing annealing is performed on the ring blank; S8, rough machining is performed on the ring blank; S9, ultrasonic flaw detection is performed on the ring blank; S10, stress relief annealing is performed on the ring blank; S11, finish machining is performed on the ring blank. The method has the advantage that the accuracy, the quality stability and the reliability of the ring forging are improved.

Description

technical field

[0001] The invention relates to the technical field of high-strength steel forming, in particular to a method for forming a large-diameter, thin-walled and high-tube type ultra-high-strength steel D406A ring forging. Background technique

[0002] D406 is a model of low-alloy ultra-high-strength steel designed and developed by my country. It is widely used in large solid rocket and missile engine casing materials. In order to improve the reliability of its application in large solid rocket and missile engines, it is developed on the basis of D406A steel was adopted, and the toughness was improved by reducing the carbon content and double vacuum (VIM+VAR) smelting technology.

[0003] With the development of my country's aerospace and new strategic missiles, large maneuverability, long range, high flight speed, and long flight time have become the development direction of aerospace weapons, which makes the use environment of D406A forgings increasingly harsh. Ma...

Examples

Embodiment 1

[0026] Embodiment 1: A method for forming a large-diameter, thin-walled, high-tube type ultra-high-strength steel D406A ring forging, such as figure 1 shown, including the following steps:

[0027] S1: blanking to obtain a blank, the size of the blank is Φ400(+3 / 0)mm*330(+3 / 0)mm, and the weight is 325kg.

[0028] S2: Billet upsetting and punching. It includes two working steps: the first working step: the billet is put into the furnace under the condition of less than 750°C, the temperature is raised to 1080°C at a rate of 250°C / h, and then kept for 120 minutes. The second working step: billet upsetting, punching to size: Φ465±10*Φ300±10*380±5mm. Avoid heating up too fast, and produce Widmanstatten structure in the blank structure, resulting in a decrease in the toughness of the structure. The reason why the heat treatment temperature is selected at 1080°C is that as the temperature increases, the degree of refinement of the martensite grains increases, and the finer grains...

Embodiment 2

[0040] Embodiment 2: A method for forming a large-diameter, thin-walled, high-tube type ultra-high-strength steel D406A ring forging, the steps different from those in Embodiment 1 are:

[0041] S2: Billet upsetting and punching. The first step: the billet is put into the furnace at a temperature of less than 750°C, and the temperature is raised to 1080°C at a rate of 320°C / h, and then kept for 120 minutes.

[0042] S4: ring blank rolling ring. It includes two working steps. The first working step: put the ring billet into the furnace at a temperature of less than 750°C, raise the temperature to 1080°C at a rate of 320°C / h, and then hold it for 30 minutes.

[0043] S5: Heat treatment of the ring billet. Including two working steps, normalizing: put the ring billet into the furnace at room temperature, raise the temperature to 720°C at a rate of 300°C / h, then keep it for 2 hours, then raise the temperature to 930°C again, keep it for 3 hours, and take it out of the furnace an...

Embodiment 3

[0045] Embodiment 3: A method for forming a large-diameter, thin-walled, high-tube type ultra-high-strength steel D406A ring forging, the steps different from those in Embodiment 1 are:

[0046] S2: Billet upsetting and punching. The first step: the billet is put into the furnace at a temperature of less than 750°C, and the temperature is raised to 1080°C at a rate of 400°C / h, and then kept for 120 minutes.

[0047] S4: ring blank rolling ring. It includes two working steps. The first working step: put the ring billet into the furnace at a temperature of less than 750°C, raise the temperature to 1080°C at a rate of 400°C / h, and then hold it for 30 minutes.

[0048] S5: Heat treatment of the ring billet. Including two working steps, normalizing: put the ring billet into the furnace at room temperature, raise the temperature to 720°C at a rate of 400°C / h, then keep it for 2 hours, then raise the temperature to 930°C again, keep it for 3 hours, and take it out of the furnace and ...

technical field

[0001] The invention relates to the technical field of high-strength steel forming, in particular to a method for forming a large-diameter, thin-walled and high-tube type ultra-high-strength steel D406A ring forging. Background technique

[0002] D406 is a model of low-alloy ultra-high-strength steel designed and developed by my country. It is widely used in large solid rocket and missile engine casing materials. In order to improve the reliability of its application in large solid rocket and missile engines, it is developed on the basis of D406A steel was adopted, and the toughness was improved by reducing the carbon content and double vacuum (VIM+VAR) smelting technology.

[0003] With the development of my country's aerospace and new strategic missiles, large maneuverability, long range, high flight speed, and long flight time have become the development direction of aerospace weapons, which makes the use environment of D406A forgings increasingly harsh. Ma...

Examples

Embodiment 1

[0026] Embodiment 1: A method for forming a large-diameter, thin-walled, high-tube type ultra-high-strength steel D406A ring forging, such as figure 1 shown, including the following steps:

[0027] S1: blanking to obtain a blank, the size of the blank is Φ400(+3 / 0)mm*330(+3 / 0)mm, and the weight is 325kg.

[0028] S2: Billet upsetting and punching. It includes two working steps: the first working step: the billet is put into the furnace under the condition of less than 750°C, the temperature is raised to 1080°C at a rate of 250°C / h, and then kept for 120 minutes. The second working step: billet upsetting, punching to size: Φ465±10*Φ300±10*380±5mm. Avoid heating up too fast, and produce Widmanstatten structure in the blank structure, resulting in a decrease in the toughness of the structure. The reason why the heat treatment temperature is selected at 1080°C is that as the temperature increases, the degree of refinement of the martensite grains increases, and the finer grains...

Embodiment 2

[0040] Embodiment 2: A method for forming a large-diameter, thin-walled, high-tube type ultra-high-strength steel D406A ring forging, the steps different from those in Embodiment 1 are:

[0041] S2: Billet upsetting and punching. The first step: the billet is put into the furnace at a temperature of less than 750°C, and the temperature is raised to 1080°C at a rate of 320°C / h, and then kept for 120 minutes.

[0042] S4: ring blank rolling ring. It includes two working steps. The first working step: put the ring billet into the furnace at a temperature of less than 750°C, raise the temperature to 1080°C at a rate of 320°C / h, and then hold it for 30 minutes.

[0043] S5: Heat treatment of the ring billet. Including two working steps, normalizing: put the ring billet into the furnace at room temperature, raise the temperature to 720°C at a rate of 300°C / h, then keep it for 2 hours, then raise the temperature to 930°C again, keep it for 3 hours, and take it out of the furnace an...

Embodiment 3

[0045] Embodiment 3: A method for forming a large-diameter, thin-walled, high-tube type ultra-high-strength steel D406A ring forging, the steps different from those in Embodiment 1 are:

[0046] S2: Billet upsetting and punching. The first step: the billet is put into the furnace at a temperature of less than 750°C, and the temperature is raised to 1080°C at a rate of 400°C / h, and then kept for 120 minutes.

[0047] S4: ring blank rolling ring. It includes two working steps. The first working step: put the ring billet into the furnace at a temperature of less than 750°C, raise the temperature to 1080°C at a rate of 400°C / h, and then hold it for 30 minutes.

[0048] S5: Heat treatment of the ring billet. Including two working steps, normalizing: put the ring billet into the furnace at room temperature, raise the temperature to 720°C at a rate of 400°C / h, then keep it for 2 hours, then raise the temperature to 930°C again, keep it for 3 hours, and take it out of the furnace and ...

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