CN116020963A - Forging process of 50Mn18Cr4V steel guard ring - Google Patents
Forging process of 50Mn18Cr4V steel guard ring Download PDFInfo
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- CN116020963A CN116020963A CN202211723713.1A CN202211723713A CN116020963A CN 116020963 A CN116020963 A CN 116020963A CN 202211723713 A CN202211723713 A CN 202211723713A CN 116020963 A CN116020963 A CN 116020963A
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Abstract
The invention discloses a forging process of a 50Mn18Cr4V steel guard ring, which comprises the following steps: s1, preheating a forging piece, heating and preserving the guard ring electroslag ingot, preserving the temperature for 3-6 h at 380-450 ℃, preserving the temperature for 6-9 h at 720-780 ℃ and preserving the temperature for 6-12 h at 1140-1200 ℃, and adopting an upper V-shaped anvil and a lower V-shaped anvil to lightly forge the whole guard ring electroslag ingot to form a guard ring billet; s2, upsetting the forged piece, upsetting the guard ring steel billet subjected to the treatment, wherein the upsetting ratio H/H is smaller than 2, and the ratio D1/D of the diameter to the aperture after upsetting is larger than or equal to 2.5; s3, stamping the forged piece, namely punching the guard ring steel billet processed in the previous step, and drawing the guard ring steel billet after punching, wherein the drawing ratio is less than 50%; s4, reaming the beam, and immediately cooling the beam in water after forging; the high-manganese austenitic steel guard ring prepared by the method has high enough yield strength, good stress corrosion resistance and fatigue failure resistance, and is not easy to crack.
Description
Technical Field
The invention relates to the technical field of steel forging, in particular to a forging process of a 50Mn18Cr4V steel guard ring.
Background
The protecting ring is an important part for fastening the coil at the end of the rotor winding of the generator, and is subjected to huge centrifugal force and bending stress of alternating action when the rotor rotates at high speed, stops and starts, and has the functions of assembly stress, temperature stress, concentrated stress and heavy and complex stress. The guard ring is in the environment of strong magnetic field and corrosion speed medium, so that stress corrosion, brittle fracture and fatigue damage are easy to occur.
Thermal deformation characteristics of high manganese austenitic steel: (1) a high tendency to deformation and hardening: as the deformation amount increases, the strength index increases rapidly, i.e. the deformation hardening tendency is large; (2) high plasticity at normal temperature and semi-thermal state; (3) carbide precipitation at medium temperature; (4) low thermal conductivity; (5) high overheat sensitivity.
Carbide is precipitated from the high manganese steel at about 750 ℃ to reduce plasticity, and the strengthening effect is reduced due to the reduction of carbon content in solid solution; the high manganese steel can lead to rapid grain growth when the temperature is higher than 1150 ℃, so the heat preservation time at high temperature is not suitable to be excessively long.
Disclosure of Invention
The invention aims to provide a forging process of a 50Mn18Cr4V steel guard ring, which aims to solve the problems in the prior art.
In order to achieve the above purpose, the present invention is realized by the following technical means:
a forging process of a 50Mn18Cr4V steel guard ring comprises the following steps:
s1, preheating a forging piece, heating and preserving the temperature of a guard ring electroslag ingot, preserving the temperature of 380-450 ℃ for 3-6 h, preserving the temperature of 720-780 ℃ for 6-9 h, controlling the temperature rising speed to be not more than 65 ℃/h, preserving the temperature of 1140-1200 ℃ for 6-12 h, controlling the temperature rising speed to be not more than 85 ℃/h, and adopting an upper V-shaped anvil and a lower V-shaped anvil to lightly forge the whole guard ring electroslag ingot to form a guard ring steel billet;
s2, upsetting the forged piece, upsetting the guard ring steel billet subjected to the treatment, wherein the upsetting ratio H/H is smaller than 2, and the ratio D1/D of the diameter to the aperture after upsetting is larger than or equal to 2.5;
s3, stamping the forged piece, namely punching the guard ring steel billet processed in the previous step, and after punching, drawing the guard ring steel billet, wherein the drawing ratio is less than 50%, and the rotation is uniform;
s4, reaming the beam, namely reaming the beam on the guard ring steel billet treated by the method, wherein the wall thickness is uniform, cracks are prevented from being generated, and water is added for cooling immediately after forging.
Further, the upper and lower V-shaped anvils used in step S1 may be replaced with upper and lower circular arc anvils.
Further, the final forging temperature of the guard ring electroslag ingot in the step S1 is 850-901 ℃.
Further, the deformation of the guard ring electroslag ingot in the step S1 is chamfered by 30-50 mm with small rolling reduction before large deformation forging, so as to forge the subsurface defect, improve the plasticity and strength of the surface layer, prevent cracks from being generated during large deformation, ensure that the pre-poking forging ratio is more than or equal to 1.4, ensure that the blanking size is less than 2.5, ensure that the end face is flat and vertical to the axis, and not allow burrs.
Compared with the prior art, the invention has the following beneficial effects:
the high-manganese austenitic steel guard ring prepared by the method has the advantages of high enough yield strength, certain yield ratio, good cutting property, minimum residual stress, minimum magnetic permeability, good stress corrosion resistance, fatigue failure resistance and the like, and is not easy to crack.
The specific embodiment is as follows:
in the present embodiment
A forging process of a 50Mn18Cr4V steel guard ring comprises the following steps:
s1, preheating a forging piece, heating and preserving the temperature of a guard ring electroslag ingot, preserving the temperature of 380-450 ℃ for 3-6 h, preserving the temperature of 720-780 ℃ for 6-9 h, controlling the temperature rising speed to be not more than 65 ℃/h, preserving the temperature of 1140-1200 ℃ for 6-12 h, controlling the temperature rising speed to be not more than 85 ℃/h, and adopting an upper V-shaped anvil and a lower V-shaped anvil to lightly forge the whole guard ring electroslag ingot to form a guard ring steel billet;
s2, upsetting the forged piece, upsetting the guard ring steel billet subjected to the treatment, wherein the upsetting ratio H/H is smaller than 2, and the ratio D1/D of the diameter to the aperture after upsetting is larger than or equal to 2.5;
s3, stamping the forged piece, namely punching the guard ring steel billet processed in the previous step, and after punching, drawing the guard ring steel billet, wherein the drawing ratio is less than 50%, and the rotation is uniform;
s4, reaming the beam, namely reaming the beam on the guard ring steel billet treated by the method, wherein the wall thickness is uniform, cracks are prevented from being generated, and water is added for cooling immediately after forging.
Further, the upper and lower V-shaped anvils used in step S1 may be replaced with upper and lower circular arc anvils.
Further, the final forging temperature of the guard ring electroslag ingot in the step S1 is 850-901 ℃.
Further, the deformation of the guard ring electroslag ingot in the step S1 is chamfered by 30-50 mm with small rolling reduction before large deformation forging, so as to forge the subsurface defect, improve the plasticity and strength of the surface layer, prevent cracks from being generated during large deformation, ensure that the pre-poking forging ratio is more than or equal to 1.4, ensure that the blanking size is less than 2.5, ensure that the end face is flat and vertical to the axis, and not allow burrs.
Example 1
A forging process of a 50Mn18Cr4V steel guard ring comprises the following steps:
s1, preheating a forging piece, heating and preserving the guard ring electroslag ingot, preserving the temperature for 4 hours at 400 ℃, preserving the temperature for 7 hours at 740 ℃, controlling the temperature rising speed to be 62 ℃/hour, preserving the temperature for 8 hours at 1150 ℃, controlling the temperature rising speed to be 82 ℃/hour, adopting an upper V-shaped anvil and a lower V-shaped anvil to lightly forge the whole guard ring electroslag ingot to form a guard ring steel billet, and enabling the final forging temperature of the guard ring electroslag ingot to be 860 ℃;
s2, upsetting the forged piece, upsetting the guard ring steel billet subjected to the treatment, wherein the upsetting ratio H/H1.8, and the ratio D1/d=2.8 of the diameter to the aperture after upsetting;
s3, stamping the forged piece, namely punching the guard ring steel billet processed in the previous step, and after punching, drawing the guard ring steel billet, wherein the drawing ratio is less than 50%, and the rotation is uniform;
s4, reaming the beam, namely reaming the beam on the guard ring steel billet treated by the method, wherein the wall thickness is uniform, cracks are prevented from being generated, and water is added for cooling immediately after forging.
Example two
A forging process of a 50Mn18Cr4V steel guard ring comprises the following steps:
s1, preheating a forging piece, heating and preserving the guard ring electroslag ingot, preserving the temperature for 4 hours at 420 ℃, preserving the temperature for 7 hours at 760 ℃, controlling the heating speed to 58 ℃/hour, preserving the temperature for 8 hours at 1150 ℃, controlling the heating speed to 78 ℃/hour, and adopting an upper V-shaped anvil and a lower V-shaped anvil to lightly forge the whole guard ring electroslag ingot to form a guard ring steel billet, wherein the final forging temperature of the guard ring electroslag ingot is 870 ℃;
s2, upsetting the forged piece, upsetting the guard ring steel billet subjected to the treatment, wherein the upsetting ratio H/H1.8, and the ratio D1/d=3 of the diameter to the aperture after upsetting;
s3, stamping the forged piece, namely punching the guard ring steel billet processed in the previous step, and after punching, drawing the guard ring steel billet, wherein the drawing ratio is less than 50%, and the rotation is uniform;
s4, reaming the beam, namely reaming the beam on the guard ring steel billet treated by the method, wherein the wall thickness is uniform, cracks are prevented from being generated, and water is added for cooling immediately after forging.
Example III
A forging process of a 50Mn18Cr4V steel guard ring comprises the following steps:
s1, preheating a forging piece, heating and preserving the guard ring electroslag ingot, carrying out heat preservation at 440 ℃ for 4h, carrying out heat preservation at 770 ℃ for 7h, controlling the temperature rising speed to 55 ℃/h, carrying out heat preservation at 1150 ℃ for 8h, controlling the temperature rising speed to 75 ℃/h, carrying out light forging on the whole guard ring electroslag ingot by adopting an upper V-shaped anvil and a lower V-shaped anvil to form a guard ring steel billet, wherein the final forging temperature of the guard ring electroslag ingot is 860 ℃;
s2, upsetting the forged piece, upsetting the guard ring steel billet subjected to the treatment, wherein the upsetting ratio H/H1.8, and the ratio D1/d=3 of the diameter to the aperture after upsetting;
s3, stamping the forged piece, namely punching the guard ring steel billet processed in the previous step, and after punching, drawing the guard ring steel billet, wherein the drawing ratio is less than 50%, and the rotation is uniform;
s4, reaming the beam, namely reaming the beam on the guard ring steel billet treated by the method, wherein the wall thickness is uniform, cracks are prevented from being generated, and water is added for cooling immediately after forging.
Mechanical property parameters of high manganese austenitic steel (50 Mn18Cr 4V):
the high-manganese austenitic steel guard ring prepared by the method has the advantages of high enough yield strength, certain yield ratio, good cutting property, minimum residual stress, minimum magnetic permeability, good stress corrosion resistance, fatigue failure resistance and the like, and is not easy to crack.
The disclosed embodiments fall within the scope of the appended claims, and are intended to be illustrative of the scope of the invention as defined by the claims, which should not be construed as limiting the scope of the claims.
When values or ranges of values, preferred ranges or a list of lower and upper preferred values are provided, it is to be understood that any range formed from any smaller range limit or preferred value and any pair of values for any larger range limit or preferred value, whether or not the ranges are separately disclosed. Where the specification describes a numerical range, unless the specification states otherwise, the range is intended to include both the end of the range and all integers and fractions within the range.
When the terms "about" or "about" are used to describe the end of a numerical value or range, the disclosure should be interpreted to include the particular numerical value or end of the range concerned.
The use of "a" and "an" are used to describe elements of the invention for convenience and to give a general description of the invention. Unless explicitly stated otherwise, the description should be understood as including one or at least one.
Claims (4)
1. A forging process of a 50Mn18Cr4V steel guard ring is characterized by comprising the following steps of: the method comprises the following steps:
s1, preheating a forging piece, heating and preserving the temperature of a guard ring electroslag ingot, preserving the temperature of 380-450 ℃ for 3-6 h, preserving the temperature of 720-780 ℃ for 6-9 h, controlling the temperature rising speed to be not more than 65 ℃/h, preserving the temperature of 1140-1200 ℃ for 6-12 h, controlling the temperature rising speed to be not more than 85 ℃/h, and adopting an upper V-shaped anvil and a lower V-shaped anvil to lightly forge the whole guard ring electroslag ingot to form a guard ring steel billet;
s2, upsetting the forged piece, upsetting the guard ring steel billet subjected to the treatment, wherein the upsetting ratio H/H is smaller than 2, and the ratio D1/D of the diameter to the aperture after upsetting is larger than or equal to 2.5;
s3, stamping the forged piece, namely punching the guard ring steel billet processed in the previous step, and after punching, drawing the guard ring steel billet, wherein the drawing ratio is less than 50%, and the rotation is uniform;
s4, reaming the beam, namely reaming the beam on the guard ring steel billet treated by the method, wherein the wall thickness is uniform, cracks are prevented from being generated, and water is added for cooling immediately after forging.
2. The forging process of the 50Mn18Cr4V steel guard ring according to claim 1, wherein: the upper and lower V-shaped anvils adopted in step S1 may be replaced with upper and lower arc anvils.
3. The forging process of the 50Mn18Cr4V steel guard ring according to claim 1, wherein: and in the step S1, the final forging temperature of the guard ring electroslag ingot is 850-901 ℃.
4. The forging process of the 50Mn18Cr4V steel guard ring according to claim 1, wherein: in the step S1, the deformation of the guard ring electroslag ingot is chamfered by 30-50 mm with small reduction before large deformation forging so as to forge the subsurface defect, improve the plasticity and strength of the surface layer, prevent cracks from being generated during large deformation, ensure that the pre-poking forging ratio is more than or equal to 1.4, ensure that the blanking size is less than 2.5, ensure that the end face is flat and vertical to the axis, and not allow burrs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211723713.1A CN116020963A (en) | 2022-12-30 | 2022-12-30 | Forging process of 50Mn18Cr4V steel guard ring |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211723713.1A CN116020963A (en) | 2022-12-30 | 2022-12-30 | Forging process of 50Mn18Cr4V steel guard ring |
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| CN116020963A true CN116020963A (en) | 2023-04-28 |
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| CN202211723713.1A Pending CN116020963A (en) | 2022-12-30 | 2022-12-30 | Forging process of 50Mn18Cr4V steel guard ring |
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