CN113265588A - Chromium-molybdenum alloy steel forging capable of improving impact performance and manufacturing process thereof - Google Patents
Chromium-molybdenum alloy steel forging capable of improving impact performance and manufacturing process thereof Download PDFInfo
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- 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
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- 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
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- 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
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- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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Abstract
The invention discloses a chromium-molybdenum alloy steel forging capable of improving impact property, which comprises the following chemical components: 0.12 to 0.16 percent of C, 0.51 to 0.55 percent of Si, 0.30 to 0.80 percent of Mn, 1.15 to 1.50 percent of Cr, 0.60 to 0.645 percent of Mo, less than or equal to 0.30 percent of Ni, less than or equal to 0.20 percent of Cu, 0.001 to 0.005 percent of P, less than or equal to 0.010 percent of S, and the balance of iron. Also discloses a manufacturing process of the chromium-molybdenum alloy steel forging, which comprises the following steps: forging: the raw material is subjected to multiple upsetting-drawing, reverse forging is carried out to form a forging with the chemical composition as in claim 1, and the forging ratio is more than or equal to 4.5; carrying out two times of pretreatment; and (3) heat treatment: sequentially quenching and tempering the forged forging, delivering the forged forging in a quenched and tempered state, cooling the forged forging by using PAG quenching liquid with the concentration of 10% at the quenching temperature of 920 +/-10 ℃, and cooling the forged forging at the tempering temperature of 650-710 ℃. By the mode, the contents of P, Si and Mo in the invention play a key role in the temper brittleness resistance of the material, and the contents are adjusted to an optimal value; the forging process is improved by adopting modes of turning forging, increasing forging ratio and the like, and the forging effect is improved.
Description
Technical Field
The invention relates to the technical field of alloy steel forging, in particular to a chromium-molybdenum alloy steel forging capable of improving impact property and a manufacturing process thereof.
Background
Because of its high-quality performance, the chromium-molybdenum steel is often used for manufacturing high-temperature and high-pressure resistant flanges, valves and other parts, and is widely used in the fields of petrochemical industry, energy, machinery and the like. The chromium-molybdenum steel has the defects of tempering brittleness, the phenomenon that the impact toughness is reduced when a workpiece works in the temperature range of 370-695 ℃ for a long time, and petrochemical hydrogen equipment just works in the temperature range for a long time, so that the technical conditions of the petrochemical hydrogen equipment forge piece require that a forge piece is subjected to a simulation test before leaving a factory, and the forge piece is prevented from being brittle when used in the temperature range in future. After simulation tests, the impact value of the traditional chromium-molybdenum alloy steel forging is very low, only 10 joules, and the performance requirements cannot be met.
Disclosure of Invention
The invention mainly solves the technical problem of providing a chromium molybdenum alloy steel forging piece capable of improving impact property and a manufacturing process thereof, and the impact property of the forging piece can be greatly improved.
In order to solve the technical problems, the invention adopts a technical scheme that: the chromium-molybdenum alloy steel forging capable of improving the impact property comprises the following chemical components: 0.12 to 0.16 percent of C, 0.50 to 0.60 percent of Si, 0.30 to 0.80 percent of Mn, 1.15 to 1.50 percent of Cr, 0.50 to 0.65 percent of Mo, less than or equal to 0.30 percent of Ni, less than or equal to 0.20 percent of Cu, less than or equal to 0.005 percent of P, less than or equal to 0.010 percent of S, and the balance of Fe.
Preferably, the following chemical components are contained: 0.12 to 0.16 percent of C, 0.51 to 0.55 percent of Si, 0.30 to 0.80 percent of Mn, 1.15 to 1.50 percent of Cr, 0.60 to 0.645 percent of Mo, less than or equal to 0.30 percent of Ni, less than or equal to 0.20 percent of Cu, 0.001 to 0.003 percent of P, less than or equal to 0.010 percent of S, and the balance of iron.
The chromium-molybdenum alloy steel is an alloy with chromium and molybdenum as main alloy elements, wherein the chromium element can improve the strength of the material and can also improve the hardenability. The molybdenum element can prevent temper brittleness, and the hardenability of the material can be improved strongly by the molybdenum element, so that the chromium-molybdenum steel has a deeper hardening layer. The molybdenum element can also keep the material with stronger heat intensity.
A manufacturing process of a chromium-molybdenum alloy steel forging capable of improving impact property comprises the following steps:
forging: forging a raw material containing the chemical composition as described in claim 1 through multiple upsetting-drawing and reverse forging, wherein the forging ratio is more than or equal to 4.5;
two times of pretreatment: the normalizing temperature of the first pretreatment is 945 +/-10 ℃, and air cooling is carried out; and the normalizing temperature of the second pretreatment is 935 +/-10 ℃, and air cooling is carried out.
And (3) heat treatment: sequentially quenching and tempering the forged forgings, delivering the forgings in a quenched and tempered state, cooling the forgings by quenching liquid at the quenching temperature of 920 +/-10 ℃, keeping the tempering temperature of 650-710 ℃ for 25 hours, and then air-cooling;
and (3) performance testing: test specimens were cut out of the heat-treated forged parts, and the specimens were processed into tensile specimens and impact specimens to conduct mechanical property tests.
Preferably, in the forging step, the multiple upsetting includes three upsetting operations and three elongation operations, and the upsetting and the elongation operations are performed alternately.
Preferably, in the forging step, the direction-changing forging is to change the position relationship between the axis of the forging and the axis of the steel ingot from parallel to vertical or from vertical to parallel.
Preferably, the quenching liquid is a PAG quenching liquid with the concentration of 10%.
The invention has the beneficial effects that:
1. the content of P, Si and Mo plays a key role in the temper brittleness resistance of the material, and the temper brittleness resistance of the chromium-molybdenum alloy steel is improved by adjusting the content of the P, Si and Mo to an optimal value.
2. The method adopts the modes of turning forging, increasing the forging ratio and the like, improves the forging process, fully eliminates the as-cast structure, forges the micro defects and improves the forging effect.
3. And determining the optimal element content and the heat treatment process parameters by software simulation and test verification by using DANTE heat treatment process design analysis software based on finite element analysis and using the technical data of the chromium-molybdenum steel in a software material library.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided in conjunction with the accompanying tables so that the advantages and features of the present invention will be readily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.
Example 1:
a chromium molybdenum alloy steel forging contains the following chemical components: 0.14% of C, 0.54% of Si, 0.80% of Mn, 1.15% of Cr, 0.62% of Mo, 0.09% of Ni, 0.18% of Cu, 0.001% of P, 0.006% of S and the balance of iron.
A manufacturing process of a chromium-molybdenum alloy steel forging comprises the following steps:
forging: forging the raw material containing the chemical components into a forging piece through multiple times of upsetting and drawing and reverse forging, wherein the forging ratio is 5.5; multiple upsetting-drawing comprises three times of upsetting and three times of drawing, and upsetting and drawing are alternately carried out; the direction-changing forging is to change the position relation between the axis of the forging and the axis of the steel ingot from parallel to vertical or from vertical to parallel.
Two times of pretreatment: normalizing at 950 ℃ for the first pretreatment, and air-cooling; and the normalizing temperature of the second pretreatment is 945 ℃, and air cooling is carried out.
And (3) heat treatment: sequentially quenching and tempering the forged forging, delivering the forging in a quenched and tempered state, cooling the forging at the quenching temperature of 920 ℃ by using PAG (PolyGesom oxygen gas) quenching liquid with the concentration of 10%, keeping the tempering temperature of 650 ℃, keeping the temperature for 25 hours, and then cooling in air;
and (3) performance testing: test specimens were cut out of the heat-treated forged parts, and the specimens were processed into tensile specimens and impact specimens to conduct mechanical property tests.
Example 2:
a chromium molybdenum alloy steel forging contains the following chemical components: 0.16% of C, 0.52% of Si, 0.55% of Mn, 1.35% of Cr, 0.64% of Mo, 0.30% of Ni, 0.06% of Cu, 0.005% of P, 0.002% of S and the balance of iron.
A manufacturing process of a chromium-molybdenum alloy steel forging comprises the following steps:
forging: forging the raw material containing the chemical components into a forge piece through multiple upsetting-drawing and reverse forging, wherein the forging ratio is 5; multiple upsetting-drawing comprises three times of upsetting and three times of drawing, and upsetting and drawing are alternately carried out; the direction-changing forging is to change the position relation between the axis of the forging and the axis of the steel ingot from parallel to vertical or from vertical to parallel.
Two times of pretreatment: normalizing at 945 ℃ for the first pretreatment, and air-cooling; and the normalizing temperature of the second pretreatment is 940 ℃, and air cooling is carried out.
And (3) heat treatment: sequentially quenching and tempering the forged forging, delivering the forging in a quenched and tempered state, cooling the forging at the quenching temperature of 985 ℃ by using PAG (PolyGesom oxygen gas) quenching liquid with the concentration of 10%, keeping the tempering temperature of 675 ℃, and then carrying out air cooling after heat preservation for 25 hours;
and (3) performance testing: test specimens were cut out of the heat-treated forged parts, and the specimens were processed into tensile specimens and impact specimens to conduct mechanical property tests.
Example 3:
a chromium molybdenum alloy steel forging contains the following chemical components: 0.12% of C, 0.51% of Si, 0.40% of Mn, 1.50% of Cr, 0.635% of Mo, 0.01% of Ni, 0.12% of Cu, 0.002% of P, 0.007% of S and the balance of iron.
A manufacturing process of a chromium-molybdenum alloy steel forging comprises the following steps:
forging: forging the raw material containing the chemical components into a forging piece through multiple times of upsetting and drawing and reverse forging, wherein the forging ratio is 6.5; multiple upsetting-drawing comprises three times of upsetting and three times of drawing, and upsetting and drawing are alternately carried out; the direction-changing forging is to change the position relation between the axis of the forging and the axis of the steel ingot from parallel to vertical or from vertical to parallel.
Two times of pretreatment: normalizing at 935 ℃ for the first pretreatment, and air cooling; and the normalizing temperature of the second pretreatment is 930 ℃, and air cooling is carried out.
And (3) heat treatment: sequentially quenching and tempering the forged forging, delivering the forging in a quenched and tempered state, cooling the forging by using PAG quenching liquid with the concentration of 10 percent at the quenching temperature of 977 ℃, keeping the temperature at 660 ℃, and then cooling by air after 25 hours;
and (3) performance testing: test specimens were cut out of the heat-treated forged parts, and the specimens were processed into tensile specimens and impact specimens to conduct mechanical property tests.
Example 4:
a chromium molybdenum alloy steel forging contains the following chemical components: 0.12% of C, 0.53% of Si, 0.60% of Mn, 1.45% of Cr, 0.60% of Mo, 0.27% of Ni, 0.08% of Cu, 0.004% of P, 0.001% of S and the balance of iron.
A manufacturing process of a chromium-molybdenum alloy steel forging comprises the following steps:
forging: forging the raw material containing the chemical components into a forge piece through multiple upsetting-drawing and reverse forging, wherein the forging ratio is 7; multiple upsetting-drawing comprises three times of upsetting and three times of drawing, and upsetting and drawing are alternately carried out; the direction-changing forging is to change the position relation between the axis of the forging and the axis of the steel ingot from parallel to vertical or from vertical to parallel.
Two times of pretreatment: the normalizing temperature of the first pretreatment is 955 ℃, and air cooling is carried out; and the normalizing temperature of the second pretreatment is 940 ℃, and air cooling is carried out.
And (3) heat treatment: sequentially quenching and tempering the forged forging, delivering the forging in a quenched and tempered state, cooling the forging at the quenching temperature of 983 ℃ by using PAG (PolyGesom oxygen gas) quenching liquid with the concentration of 10%, keeping the tempering temperature of 710 ℃, and then carrying out air cooling after heat preservation for 25 hours;
and (3) performance testing: test specimens were cut out of the heat-treated forged parts, and the specimens were processed into tensile specimens and impact specimens to conduct mechanical property tests.
Example 5:
a chromium molybdenum alloy steel forging contains the following chemical components: 0.15% of C, 0.51% of Si, 0.30% of Mn, 1.30% of Cr, 0.61% of Mo, 0.18% of Ni, 0.20% of Cu, 0.005% of P, 0.010% of S and the balance of iron.
A manufacturing process of a chromium-molybdenum alloy steel forging comprises the following steps:
forging: forging the raw material containing the chemical components into a forging piece through multiple times of upsetting and drawing and reverse forging, wherein the forging ratio is 6.5; multiple upsetting-drawing comprises three times of upsetting and three times of drawing, and upsetting and drawing are alternately carried out; the direction-changing forging is to change the position relation between the axis of the forging and the axis of the steel ingot from parallel to vertical or from vertical to parallel.
Two times of pretreatment: the normalizing temperature of the first pretreatment is 940 ℃, and air cooling is carried out; and the normalizing temperature of the second pretreatment is 925 ℃, and air cooling is carried out.
And (3) heat treatment: sequentially quenching and tempering the forged forging, delivering the forging in a quenched and tempered state, cooling the forging at 970 ℃ by using PAG (PolyGesom) quenching liquid with the concentration of 10 percent, keeping the tempering temperature at 700 ℃, preserving the heat for 25 hours, and then air-cooling;
and (3) performance testing: test specimens were cut out of the heat-treated forged parts, and the specimens were processed into tensile specimens and impact specimens to conduct mechanical property tests.
Example 6:
a chromium molybdenum alloy steel forging contains the following chemical components: 0.13% of C, 0.55% of Si, 0.70% of Mn, 1.20% of Cr, 0.645% of Mo, 0.23% of Ni, 0.01% of Cu, 0.003% of P, 0.004% of S and the balance of iron.
A manufacturing process of a chromium-molybdenum alloy steel forging comprises the following steps:
forging: forging the raw material containing the chemical components into a forging piece through multiple times of upsetting and drawing and reverse forging, wherein the forging ratio is 8; multiple upsetting-drawing comprises three times of upsetting and three times of drawing, and upsetting and drawing are alternately carried out; the direction-changing forging is to change the position relation between the axis of the forging and the axis of the steel ingot from parallel to vertical or from vertical to parallel.
Two times of pretreatment: normalizing at 950 ℃ for the first pretreatment, and air-cooling; and the normalizing temperature of the second pretreatment is 935 ℃, and air cooling is carried out.
And (3) heat treatment: sequentially quenching and tempering the forged forging, delivering the forging in a quenched and tempered state, cooling the forging at 990 ℃ by using PAG (PolyGesom) quenching liquid with the concentration of 10%, keeping the tempering temperature at 680 ℃ for 25 hours, and then air-cooling;
and (3) performance testing: test specimens were cut out of the heat-treated forged parts, and the specimens were processed into tensile specimens and impact specimens to conduct mechanical property tests.
Comparative example 1:
a chromium molybdenum alloy steel forging contains the following chemical components: 0.13% of C, 0.65% of Si, 0.70% of Mn, 1.20% of Cr, 0.55% of Mo, 0.23% of Ni, 0.01% of Cu, 0.003% of P, 0.011% of S and the balance of iron.
A manufacturing process of a chromium-molybdenum alloy steel forging comprises the following steps:
forging: forging the raw material containing the chemical components into a forging piece through multiple times of upsetting and drawing and reverse forging, wherein the forging ratio is 8; multiple upsetting-drawing comprises three times of upsetting and three times of drawing, and upsetting and drawing are alternately carried out; the direction-changing forging is to change the position relation between the axis of the forging and the axis of the steel ingot from parallel to vertical or from vertical to parallel.
Two times of pretreatment: normalizing at 950 ℃ for the first pretreatment, and air-cooling; and the normalizing temperature of the second pretreatment is 935 ℃, and air cooling is carried out.
And (3) heat treatment: sequentially quenching and tempering the forged forging, delivering the forging in a quenched and tempered state, cooling the forging at 990 ℃ by using PAG (PolyGesom) quenching liquid with the concentration of 10%, keeping the tempering temperature at 680 ℃ for 25 hours, and then air-cooling;
and (3) performance testing: test specimens were cut out of the heat-treated forged parts, and the specimens were processed into tensile specimens and impact specimens to conduct mechanical property tests.
Comparative example 2:
a chromium molybdenum alloy steel forging contains the following chemical components: 0.13% of C, 0.55% of Si, 0.70% of Mn, 1.20% of Cr, 0.645% of Mo, 0.23% of Ni, 0.01% of Cu, 0.003% of P, 0.004% of S and the balance of iron.
The chromium molybdenum alloy steel forging in comparative example 2 was made using a conventional manufacturing process.
TABLE 1 composition percentages of Cr-Mo alloy steel forgings in examples 1-6 and comparative examples 1-2
Table 1 shows the components of the chromium-molybdenum alloy steel forgings in examples 1 to 6 and comparative examples 1 to 2, and the chromium-molybdenum alloy steel forgings prepared in each example and comparative example in table 1 were subjected to simulation tests and performance test tests, wherein each forging was subjected to three times of impact value tests, and the test results are shown in table 2.
Table 2 impact value test results of chromium molybdenum alloy steel forgings in examples 1 to 6 and comparative examples 1 to 2
As can be seen from Table 2, the impact value of the forging in the examples 1-6 is far greater than that of the forging in the comparative examples 1-2. In the embodiments 1-6, the forgings are made of the chemical components and the manufacturing process, and the impact values are all above 120J. Comparative example 1 adopts conventional chemical components, but the impact value of the manufacturing process of the invention is smaller than that of examples 1-6, which shows that the manufacturing process of the invention is beneficial to improving the impact value. Comparative example 2 is prepared by using the chemical components of the present invention and using a conventional manufacturing process, and the impact value is smaller than that of examples 1 to 6, which shows that the chemical components of the present invention are advantageous for improving the impact value.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent flow transformations that may be applied to the present specification and tables, or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (6)
1. A chromium-molybdenum alloy steel forging capable of improving impact property is characterized by comprising the following chemical components: 0.12 to 0.16 percent of C, 0.50 to 0.60 percent of Si, 0.30 to 0.80 percent of Mn, 1.15 to 1.50 percent of Cr, 0.50 to 0.65 percent of Mo, less than or equal to 0.30 percent of Ni, less than or equal to 0.20 percent of Cu, less than or equal to 0.005 percent of P, less than or equal to 0.010 percent of S, and the balance of Fe.
2. The manufacturing process of the chromium molybdenum alloy steel forging capable of improving the impact property as claimed in claim 1, wherein the chromium molybdenum alloy steel forging comprises the following chemical components: 0.12 to 0.16 percent of C, 0.51 to 0.55 percent of Si, 0.30 to 0.80 percent of Mn, 1.15 to 1.50 percent of Cr, 0.60 to 0.645 percent of Mo, less than or equal to 0.30 percent of Ni, less than or equal to 0.20 percent of Cu, 0.001 to 0.003 percent of P, less than or equal to 0.010 percent of S, and the balance of iron.
3. A manufacturing process of a chromium-molybdenum alloy steel forging capable of improving impact property is characterized by comprising the following steps:
forging: forging a raw material containing the chemical composition as described in claim 1 or 2 through multiple upsetting-drawing and reverse forging to form a forging with a forging ratio of 4.5 or more;
two times of pretreatment: the normalizing temperature of the first pretreatment is 945 +/-10 ℃, and air cooling is carried out; and the normalizing temperature of the second pretreatment is 935 +/-10 ℃, and air cooling is carried out.
And (3) heat treatment: sequentially quenching and tempering the forged forgings, delivering the forgings in a quenched and tempered state, cooling the forgings by quenching liquid at the quenching temperature of 920 +/-10 ℃, keeping the tempering temperature of 650-710 ℃ for 25 hours, and then air-cooling;
and (3) performance testing: test specimens were cut out of the heat-treated forged parts, and the specimens were processed into tensile specimens and impact specimens to conduct mechanical property tests.
4. The manufacturing process of the chromium molybdenum alloy steel forging capable of improving the impact property as claimed in claim 3, wherein the manufacturing process comprises the following steps: in the forging step, the multiple upsetting-drawing includes three times of upsetting and three times of drawing, and the upsetting and the drawing are alternately performed.
5. The manufacturing process of the chromium molybdenum alloy steel forging capable of improving the impact property as claimed in claim 3, wherein the manufacturing process comprises the following steps: in the forging step, the direction-changing forging is to change the position relation between the axis of the forging and the axis of the steel ingot from parallel to vertical or from vertical to parallel.
6. The manufacturing process of the chromium molybdenum alloy steel forging capable of improving the impact property as claimed in claim 3, wherein the manufacturing process comprises the following steps: the quenching liquid is PAG quenching liquid with the concentration of 10%.
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| CN114411058A (en) * | 2022-01-06 | 2022-04-29 | 南京钢铁股份有限公司 | Heat-resistant steel plate for longitudinal submerged arc welded pipe and production method thereof |
| CN115094350A (en) * | 2022-07-13 | 2022-09-23 | 江油市长祥特殊钢制造有限公司 | Preparation method of nuclear power SA182F316L valve body forging |
| CN115595506A (en) * | 2022-11-01 | 2023-01-13 | 伊莱特能源装备股份有限公司（Cn） | High-quality low-alloy high-strength plate steel forging and preparation method thereof |
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| CN114318162B (en) * | 2021-12-27 | 2024-06-04 | 中航卓越锻造（无锡）有限公司 | Flange forging for high-impact-performance water turbine and manufacturing method thereof |
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| CN115094350A (en) * | 2022-07-13 | 2022-09-23 | 江油市长祥特殊钢制造有限公司 | Preparation method of nuclear power SA182F316L valve body forging |
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| CN115595506A (en) * | 2022-11-01 | 2023-01-13 | 伊莱特能源装备股份有限公司（Cn） | High-quality low-alloy high-strength plate steel forging and preparation method thereof |
| CN115595506B (en) * | 2022-11-01 | 2024-04-09 | 伊莱特能源装备股份有限公司 | High-quality low-alloy high-strength plate steel forging and preparation method thereof |
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