CN112593059A - Thermal deformation method for reducing delta ferrite content in martensitic stainless steel - Google Patents
Thermal deformation method for reducing delta ferrite content in martensitic stainless steel Download PDFInfo
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- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 48
- 229910001105 martensitic stainless steel Inorganic materials 0.000 title claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 57
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 49
- 239000010959 steel Substances 0.000 claims abstract description 49
- 238000005242 forging Methods 0.000 claims abstract description 48
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims description 13
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 241000007534 Acacia tetragonophylla Species 0.000 abstract 1
- 239000011651 chromium Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000004321 preservation Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 238000000265 homogenisation Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- OIGNJSKKLXVSLS-VWUMJDOOSA-N prednisolone Chemical compound O=C1C=C[C@]2(C)[C@H]3[C@@H](O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 OIGNJSKKLXVSLS-VWUMJDOOSA-N 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052729 chemical element Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Forging (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention belongs to the technical field of steel thermal deformation, and particularly relates to a thermal deformation method for reducing the content of delta ferrite in martensitic stainless steel. At present, no report that the ferrite content in martensitic stainless steel is further reduced by a hot deformation method exists, and the invention provides a hot deformation method for reducing the delta ferrite content in martensitic stainless steel, which comprises the following steps: a. placing a martensitic stainless steel ingot in a heating furnace, heating to 1180-1200 ℃ at a heating rate of less than or equal to 60 ℃/h, and keeping the temperature for more than or equal to 8 h; b. discharging and performing quick forging, wherein the quick forging adopts an upsetting and drawing process, upsetting is performed for 1 time, and drawing is performed for 1 time; c. placing the billet in a heating furnace, heating to 1200 ℃ at the speed of less than or equal to 60 ℃/h, and preserving heat for 8-12 h; d. finish forging of steel billet at the temperature not lower than 900 deg.c. The method adopts the methods of upsetting, drawing and homogenizing heat treatment, finally reduces the area percentage content of delta ferrite in the martensitic stainless steel billet to about 1.5 percent, and is suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of steel thermal deformation, and particularly relates to a thermal deformation method for reducing the content of delta ferrite in martensitic stainless steel.
Background
The 05Cr17NiCu4Nb steel is a novel martensite precipitation hardening ultra-high strength stainless steel which is widely used in the last-stage and the next-stage blades of a steam turbine, the front and back mounting edges and valve parts of an engine turbine, and fasteners of missiles in the manufacture of aircraft and military products. Meanwhile, the composite material can also be applied to aerospace industry, aerospace turbine blades, important structural parts in nuclear reactors and the like. The 05Cr17NiCu4Nb steel contains ferrite-forming elements such as Cr, Mo, V, Si, etc., and these elements are difficult to balance with austenite-forming elements, so that a delta-ferrite structure harmful to the material is generated during the smelting and heating processes.
The delta-ferrite is mainly distributed at the prior austenite grain boundary, and generates coarse carbide at the boundary with the matrix, and the carbide seriously weakens the strengthening effect of the grain boundary, becomes a crack initiation source of cracks, causes the reduction of the toughness of the material, and is also a key index for determining the product quality. At present, the area percentage of delta ferrite of 05Cr17NiCu4Nb steel in the market is generally less than or equal to 5 percent, and because the market requirement is continuously upgraded, the production of 05Cr17NiCu4Nb steel with lower delta ferrite and more excellent performance becomes more important.
At present, with respect to reducing delta ferrite in 05Cr17NiCu4Nb steel, studies have been made to predict the formation of delta-F by a method that combines chemical components and hot working temperature, and to reduce the content of ferrite-forming elements and increase the content of austenite-forming elements, thereby obtaining a lower chromium equivalent and reducing the formation of delta-F phases.
The formation of delta-ferrite is predicted by a method taking chemical components and hot working temperature into consideration, the fact that E delta F is determined by ECr and ET together is confirmed, the content of E delta F can be effectively limited by controlling ECr and ET to be low, experiments prove that the content of ECr is controlled to be below 8.5, and the forging temperature is controlled to be below 1300 ℃ so as to ensure low E delta F. The content of austenite forming elements is improved by reducing the content of ferrite forming elements, so that lower chromium equivalent is obtained, and the formation of delta-ferrite is reduced.
In addition, on the basis of determining reasonable chemical components, the formation of a ferrite phase in the hot working process is reduced by controlling the forging temperature, the ferrite is correspondingly controlled within 10 percent in China generally, and the ferrite phase can be controlled within 5 percent by adopting the measures.
Therefore, at present, the chemical components of steel grades are generally controlled in the industry, ferrite formation is controlled in the smelting process, and the ferrite formation can be generally controlled within 5%, so that the ferrite content is extremely difficult to further reduce.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: at present, no report exists for further reducing the ferrite content of martensitic stainless steel by a hot deformation method.
The technical scheme for solving the technical problems comprises the following steps: a hot deformation method for reducing the content of delta ferrite in martensitic stainless steel is provided. The method comprises the following steps:
a. placing a martensitic stainless steel ingot in a heating furnace, heating to 1180-1200 ℃ at a heating rate of less than or equal to 60 ℃/h, and keeping the temperature for more than or equal to 8 h;
b. b, discharging the electroslag ingot obtained in the step a from a furnace, and quickly forging, wherein the forging temperature is more than or equal to 1050 ℃, and the final forging temperature is more than or equal to 900 ℃; the rapid forging adopts an upsetting and drawing process, wherein upsetting is performed for 1 time, and drawing is performed for 1 time;
c. b, placing the steel billet subjected to the rapid forging in the step b into a heating furnace, heating to 1200 ℃ at a speed of less than or equal to 60 ℃/h, and preserving heat for 8-12 h;
d. and c, carrying out precision forging on the steel billet obtained in the step c, wherein the finish forging temperature is more than or equal to 900 ℃.
In the above thermal deformation method for reducing the content of δ ferrite in martensitic stainless steel, the martensitic stainless steel in step a is 05Cr17NiCu4Nb steel.
In the above thermal deformation method for reducing the content of δ ferrite in martensitic stainless steel, the chemical composition of the 05Cr17NiCu4Nb steel includes: c, according to weight percentage: 0.045-0.060%, Si: 0.15-0.40%, Mn: 0.25 to 0.50%, Cr: 15.15-15.45%, Ni: 4.30-4.60%, Cu: 3.20 to 3.50 percent, and the balance of Fe and inevitable impurities.
Further, in the above hot deformation method for reducing the content of δ ferrite in martensitic stainless steel, the inevitable impurities include P and S.
Furthermore, in the hot deformation method for reducing the content of the delta ferrite in the martensitic stainless steel, P is less than or equal to 0.015 percent and S is less than or equal to 0.0025 percent in the inevitable impurities.
In the thermal deformation method for reducing the content of delta ferrite in the martensitic stainless steel, the upsetting in the step b requires that the height of the upset billet is less than or equal to 1/2 of the original height of the electroslag ingot.
In the thermal deformation method for reducing the content of delta ferrite in the martensitic stainless steel, the drawing in the step b requires that the diameter of the billet after drawing is the diameter of the electroslag ingot before upsetting.
The invention has the beneficial effects that:
the invention provides a thermal deformation method for reducing the content of delta ferrite in martensitic stainless steel, which is characterized in that steel components are reasonably controlled, and a method of upsetting, drawing and homogenizing heat treatment is adopted, so that the area percentage content of the delta ferrite in a martensitic stainless steel billet subjected to homogenizing heat treatment after thermal deformation is greatly reduced to about 1.5%.
Detailed Description
The invention provides a thermal deformation method for reducing the content of delta ferrite in martensitic stainless steel, which comprises the following steps:
a. placing a martensitic stainless steel ingot in a heating furnace, heating to 1180-1200 ℃ at a heating rate of less than or equal to 60 ℃/h, and keeping the temperature for more than or equal to 8 h;
b. b, discharging the electroslag ingot obtained in the step a from a furnace, and quickly forging, wherein the forging temperature is more than or equal to 1050 ℃, and the final forging temperature is more than or equal to 900 ℃; the rapid forging adopts an upsetting and drawing process, wherein upsetting is performed for 1 time, and drawing is performed for 1 time;
c. b, placing the steel billet subjected to the rapid forging in the step b into a heating furnace, heating to 1200 ℃ at a speed of less than or equal to 60 ℃/h, and preserving heat for 8-12 h;
d. and c, carrying out precision forging on the steel billet obtained in the step c, wherein the finish forging temperature is more than or equal to 900 ℃.
In the above thermal deformation method for reducing the content of δ ferrite in martensitic stainless steel, the martensitic stainless steel in step a is 05Cr17NiCu4Nb steel.
In the above thermal deformation method for reducing the content of δ ferrite in martensitic stainless steel, the chemical composition of the 05Cr17NiCu4Nb steel includes: c, according to weight percentage: 0.045-0.060%, Si: 0.15-0.40%, Mn: 0.25 to 0.50%, Cr: 15.15-15.45%, Ni: 4.30-4.60%, Cu: 3.20 to 3.50 percent, and the balance of Fe and inevitable impurities.
Further, in the above hot deformation method for reducing the content of δ ferrite in martensitic stainless steel, the inevitable impurities include P and S.
Furthermore, in the hot deformation method for reducing the content of the delta ferrite in the martensitic stainless steel, P is less than or equal to 0.015 percent and S is less than or equal to 0.0025 percent in the inevitable impurities.
In order to avoid cracking of the martensitic stainless steel in the heating process, the heating rate is controlled to be less than or equal to 60 ℃/h particularly during heating in the step a, meanwhile, the heating temperature is controlled to be 1180-1200 ℃, and the heat preservation time is controlled to be more than or equal to 8 h. The heating temperature is too low, the heat preservation time is too short, and the steel billet is easy to crack; if the heating temperature is too high and the heat preservation time is too long, delta ferrite is easily formed, which is not beneficial to the control of subsequent ferrite.
The invention particularly adopts an upsetting and drawing process in the thermal deformation process, and aims to change the shape and distribution of delta ferrite, reduce the size of the ferrite, increase the specific surface area of an interface between the ferrite and a martensite substrate and contribute to the full diffusion of elements. In order to fully break the original ferrite, a large number of tests show that the effect is best when the height of the upset billet is less than or equal to 1/2 of the original height of the electroslag ingot and the diameter of the drawn billet is the diameter of the electroslag ingot before upset.
Because the non-equilibrium delta ferrite is the component segregation caused by the over-high cooling speed and insufficient component diffusion, the invention also carries out heat treatment to eliminate the component segregation. After the process of upsetting and drawing out, the invention also carries out special homogenization treatment. The steel ingot after the first heading and the first drawing is subjected to the homogenization heat treatment at 1200 ℃, so that the full diffusion of chemical elements due to concentration difference can be promoted in a proper and sufficient heat preservation time, and the segregation of chemical element components is reduced, thereby further reducing the percentage content of delta ferrite. Through the steps, the volume percentage of delta ferrite in the final martensitic stainless steel is enabled to be less than or equal to 2 percent.
The following examples are intended to illustrate specific embodiments of the present invention without limiting the scope of the invention to the examples.
Example 1 martensitic stainless steel is heat treated by the method of the invention
Example 1 a 05Cr17Ni4Cu4Nb steel was used, the steel composition being: c: 0.050%, Si: 0.30%, Mn: 0.35%, Cr: 15.20%, Ni: 4.40%, Cu 3.30%, and the balance Fe and inevitable impurities. The outer diameter of the steel after forging is required to be phi 550 mm.
The steel is subjected to heat treatment, and the specific operation steps are as follows:
(1) heating an electroslag ingot: placing an electroslag ingot with the diameter of 730mm in a chamber type heating furnace, heating to 1200 ℃ at the heating rate of 50 ℃/h, and finally preserving heat for 12 hours.
(2) And (3) quick forging of an electroslag ingot: firstly, compressing the steel ingot along the axial direction until the length of the blank is 1/2 the height of the original electroslag ingot; and then, forging and pressing the upset steel ingot along the direction vertical to the axial direction until the diameter of the blank is the diameter of the original electroslag ingot. The open forging temperature is 1050 ℃, and the finish forging temperature is not lower than 900 ℃.
(3) Homogenizing and heat treating: and returning the fast forged blank to a chamber furnace, heating to 1200 ℃ at a heating rate of 70 ℃, and preserving heat for 12 hours.
(4) And (3) precision forging and rolling into a material: and (3) forging the blank subjected to the homogenization heat treatment and heat preservation into a steel ingot with the diameter of phi 550mm by a precision forging machine.
The steel ingots having a diameter of phi 550mm obtained in the examples had a ferrite content of 2.8%.
Example 2 heat treatment of martensitic stainless steel using the method of the invention
Example 2 a 05Cr17Ni4Cu4Nb steel was used, the steel composition being: c: 0.055%, Si: 0.35%, Mn: 0.40%, Cr: 15.25%, Ni: 4.45%, Cu 3.25%, and the balance Fe and inevitable impurities. The outer diameter of the forged steel is required to be phi 450 mm.
The steel is subjected to heat treatment, and the specific operation steps are as follows:
(1) heating an electroslag ingot: placing the electroslag ingot with the diameter of 630mm in a chamber type heating furnace, heating to 1195 ℃ at the heating rate of 50 ℃/h, and finally preserving the heat for 12 hours.
(2) And (3) quick forging of an electroslag ingot: firstly, compressing the steel ingot along the axial direction until the length of the blank is 1/2 the height of the original electroslag ingot; and then, forging and pressing the upset steel ingot along the direction vertical to the axial direction until the diameter of the blank is the diameter of the original electroslag ingot. The open forging temperature is 1050 ℃, and the finish forging temperature is not lower than 900 ℃.
(3) Homogenizing and heat treating: and returning the fast forged blank to a chamber furnace, heating to 1200 ℃ at a heating rate of 60 ℃, and preserving heat for 12 hours.
(4) And (3) precision forging and rolling into a material: and forging the blank subjected to the homogenization heat treatment and heat preservation into a steel ingot with the diameter of phi 450mm by a precision forging machine.
The steel ingots having a diameter of 450mm obtained in the examples had a ferrite content of 2.0%.
Example 3 martensitic stainless steel was heat treated by the method of the invention
Example 3 a 05Cr17Ni4Cu4Nb steel was used, the steel composition being C: 0.050%, Si: 0.25%, Mn: 0.45%, Cr: 15.20%, Ni: 4.50%, Cu 3.30%, and the balance Fe and inevitable impurities. The outer diameter of the forged steel is required to be phi 350 mm.
The steel is subjected to heat treatment, and the specific operation steps are as follows:
(1) heating an electroslag ingot: placing the electroslag ingot with the diameter of 550mm in a chamber type heating furnace, heating to 1190 ℃ at the heating rate of 60 ℃/h, and finally preserving the heat for 12 hours.
(2) And (3) quick forging of an electroslag ingot: firstly, compressing the steel ingot along the axial direction until the length of the blank is 1/2 the height of the original electroslag ingot; and then, forging and pressing the upset steel ingot along the direction vertical to the axial direction until the diameter of the blank is the diameter of the original electroslag ingot. The open forging temperature is 1050 ℃, and the finish forging temperature is not lower than 900 ℃.
(3) Homogenizing and heat treating: and returning the fast forged blank to a chamber furnace, heating to 1200 ℃ at a heating rate of 70 ℃, and preserving heat for 12 hours.
(4) And (3) precision forging and rolling into a material: and (3) forging the blank subjected to the homogenization heat treatment and heat preservation into a steel ingot with the diameter of phi 350mm by a precision forging machine.
The steel ingots having a diameter of phi 350mm obtained in the examples had a ferrite content of 1.5%.
From the above examples, it can be seen that the delta ferrite content of 05Cr17Ni4Cu4Nb steels with different compositions and different diameters can be reduced to within 2% and at least to about 1.5% by the method of the present invention, and compared with the existing method, the delta ferrite content is significantly reduced, and the method has a very high application value.
Claims (7)
1. A thermal deformation method for reducing the delta ferrite content in martensitic stainless steel, comprising the steps of:
a. placing a martensitic stainless steel ingot in a heating furnace, heating to 1180-1200 ℃ at a heating rate of less than or equal to 60 ℃/h, and keeping the temperature for more than or equal to 8 h;
b. b, discharging the electroslag ingot obtained in the step a from a furnace, and quickly forging, wherein the forging temperature is more than or equal to 1050 ℃, and the final forging temperature is more than or equal to 900 ℃; the rapid forging adopts an upsetting and drawing process, wherein upsetting is performed for 1 time, and drawing is performed for 1 time;
c. b, placing the steel billet subjected to the rapid forging in the step b into a heating furnace, heating to 1200 ℃ at a speed of less than or equal to 60 ℃/h, and preserving heat for 8-12 h;
d. and c, carrying out precision forging on the steel billet obtained in the step c, wherein the finish forging temperature is more than or equal to 900 ℃.
2. A hot deformation process to reduce the content of δ -ferrite in martensitic stainless steel as claimed in claim 1 wherein: the martensitic stainless steel of the step a is 05Cr17NiCu4Nb steel.
3. A hot deformation process to reduce the content of δ -ferrite in martensitic stainless steel as claimed in claim 2 wherein: the chemical components of the 05Cr17NiCu4Nb steel comprise: c, according to weight percentage: 0.045-0.060%, Si: 0.15-0.40%, Mn: 0.25 to 0.50%, Cr: 15.15-15.45%, Ni: 4.30-4.60%, Cu: 3.20 to 3.50 percent, and the balance of Fe and inevitable impurities.
4. A hot deformation process to reduce the content of δ -ferrite in martensitic stainless steel as claimed in claim 3 wherein: the inevitable impurities include P and S.
5. A hot deformation process to reduce the content of δ -ferrite in martensitic stainless steel as claimed in claim 3 wherein: the content of P in the inevitable impurities is less than or equal to 0.015 percent and the content of S in the inevitable impurities is less than or equal to 0.0025 percent.
6. A hot deformation process to reduce the content of δ -ferrite in martensitic stainless steel as claimed in claim 1 wherein: and c, the upsetting in the step b requires that the height of the upset billet is less than or equal to 1/2 of the original height of the electroslag ingot.
7. A hot deformation process to reduce the content of δ -ferrite in martensitic stainless steel as claimed in claim 1 wherein: and c, drawing in the step b requires that the diameter of the drawn billet is the diameter of the electroslag ingot before upsetting.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114032375A (en) * | 2021-11-09 | 2022-02-11 | 成都先进金属材料产业技术研究院股份有限公司 | Processing method of super 13Cr stainless steel forged material |
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| CN112593059B (en) | 2022-05-24 |
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Application publication date: 20210402 Assignee: PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL Co.,Ltd. Assignor: Chengdu advanced metal material industry technology Research Institute Co.,Ltd. Contract record no.: X2024980003064 Denomination of invention: Reduce the content of martensitic stainless steel d Thermal deformation method for ferrite content Granted publication date: 20220524 License type: Exclusive License Record date: 20240322 |