CN113957341A - Pump shell forging for furnace water circulating pump and manufacturing method - Google Patents
Pump shell forging for furnace water circulating pump and manufacturing method Download PDFInfo
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- 238000005242 forging Methods 0.000 title claims abstract description 66
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 28
- 239000010959 steel Substances 0.000 claims description 28
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 12
- 238000013461 design Methods 0.000 claims description 11
- 230000009467 reduction Effects 0.000 claims description 10
- 238000007514 turning Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 5
- 229910001339 C alloy Inorganic materials 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 abstract description 15
- 239000002994 raw material Substances 0.000 abstract description 8
- 230000007547 defect Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 8
- 229910052804 chromium Inorganic materials 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 238000005496 tempering Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K3/00—Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Forging (AREA)
Abstract
The invention relates to a pump shell forging for a furnace water circulation pump, which can effectively reduce the cost of raw materials and the machining allowance, can also reduce the manufacturing process, quicken the manufacturing progress, and ensure that the manufacturing quality meets the requirements of ASTM A388& ASME III, Division II and Paragraph3.3.4, and a manufacturing method thereof, wherein the mass fraction is as follows: less than or equal to 0.25 percent of C, 0.15-0.35 percent of Si, 0.60-0.90 percent of Mn, 0.44-0.65 percent of Mo, 0.10-0.20 percent of Cr0.10-0.20 percent of Ni, less than or equal to 0.035 percent of P, and less than or equal to 0.035 percent of S. The advantages are that: firstly, ultrasonic flaw detection of the pump shell forging piece does not find any standard exceeding defect, and all technical parameters meet or exceed the requirements specified by ASTM A388& ASME III, Division II and Paragraph 3.3.4; secondly, the raw material cost is greatly reduced, and a large amount of machining allowance is reduced for the subsequent machining of the spherical section; thirdly, the forging density of the forge piece is ensured, meanwhile, the production flow is reduced, and the manufacturing progress is accelerated.
Description
Technical Field
The invention relates to a pump shell forging for a furnace water circulation pump, which can effectively reduce the cost of raw materials and machining allowance, can reduce the manufacturing process, quickens the manufacturing progress and ensures that the manufacturing quality meets the requirements of ASTM A388& ASME III, Division II and Paragraph3.3.4, and a manufacturing method thereof, belonging to the field of manufacturing of specific forgings.
Background
The Haywardtyler group has a history of nearly 200 years, and main products of the Haywardtyler group are non-sealing wet stator pumps which are distributed all over the world, are applied to the fields of nuclear power generation, thermal power generation and the like, and are global high-quality manufacturers in the aspects of pumps and motors in the professional field. The Hawood Taylor is an expert in the aspects of installation, prevention, maintenance and overhaul of furnace water circulating pumps in the world, provides more than 500 pieces of furnace water circulating pump equipment for China and southeast Asia regions, and bears a large amount of installation, debugging, maintenance and after-sale technical support works.
The boiler water circulating pump is a large-flow, low-lift single-stage centrifugal pump which is arranged in a boiler evaporation system and bears high temperature and high pressure to make working media perform forced flow, and structurally comprises a pump shell, an impeller, a bearing and a heat insulator. Boiler water circulation pumps are commonly used in start-up systems for forced circulation drum boilers and once-through boilers.
The pump casing is one of the parts bearing high temperature and high pressure, is a spherical retting ball structure, and is characterized by smaller wall thickness and less corresponding thermal stress. However, the inner cavity of the larger sphere is not matched with the impeller of the pump, so that the structure of a hydraulic part of the pump is complex, and the pump shell is heavy.
From the element components of the existing pump shell forging material, the material is low-carbon alloy steel, and the alloy component only contains about 0.50% of Mo element. After heat treatment, the material can meet the strength index of American standard A182 and additionally meet the requirement of impact toughness at the temperature of-20 ℃. And from the structural feature of product, the cross-section of this pump casing forging, wall thickness are big, and the degree of difficulty that satisfies the mechanical properties requirement is fairly difficult. The traditional production process scheme of the pump shell forging is that after two upsetting and two drawing processes are carried out on a steel ingot, a material is printed and distributed, two parts are continuously forged, a finished product is finished, and then the spherical section is processed through subsequent machining. The disadvantages of this solution are: firstly, although the traditional process enables the whole forging process to be convenient and fast, the weight of a blank of each forging piece is increased by nearly 900Kg, the loss of raw materials is increased by 1 ton, and the cost is increased linearly; secondly, when the cost of raw materials is increased, the spherical section of the pump shell forging piece needs to be realized by a machining means, so that the production period is greatly prolonged, and the manufacturing cost is increased; thirdly, the excessive blank allowance of the pump shell forging can cause the internal structure of the forging to be incapable of being fully forged and compacted, the internal quality of the forging is directly influenced, and the impact toughness value measured at the temperature of 20 ℃ below zero is unstable through the conventional positive tempering heat treatment scheme, so that the requirement that AKv is more than or equal to 27J cannot be met.
Disclosure of Invention
The design purpose is as follows: the defects in the background technology are avoided, and the pump shell forging for the furnace water circulation pump and the manufacturing method thereof are designed, wherein the raw material cost and the machining allowance can be effectively reduced, the manufacturing process can be reduced, the manufacturing progress is accelerated, and the manufacturing quality is ensured to meet the requirements of ASTM A388& ASME III, Division II and Paragraph 3.3.4.
The design scheme is as follows: the pump shell forging is an important part in a furnace water circulating pump system, and the quality of the pump shell forging directly influences the service life of the furnace water circulating pump. The invention aims to produce a pump shell forging with low manufacturing cost and high product quality. The applicant is dedicated to develop a pump body type forging for years, keeps years of business cooperation with American many pump production enterprises such as Foss, China electric construction, Hawood Taylor and the like, develops a novel high-quality pump shell forging by technological innovation and optimization process according to the product requirements of the enterprises, pushes the forging to the market and obtains good customer feedback. In the design of the technical scheme: (1) in order to meet the requirement of the product on strength and meet the standard of impact toughness value at the low temperature of minus 20 ℃, the method is realized by adopting a scheme of optimizing the content of material elements. By adding the alloying elements Cr and Ni, Cr has many valuable properties: high hardness, high strength, high yield point, high wear resistance, and good plasticity and toughness; mo is combined with Cr and Ni to greatly improve hardenability, refine crystal grains, improve toughness and facilitate forging. Therefore, the optimized chemical composition (% by mass) is as follows:
C≤0.25、Si 0.15～0.35、Mn 0.60～0.90、Mo0.44～0.65、Cr 0.10～0.20、Ni 0.10～0.20、P≤0.035、S≤0.035 。
1. the Cr element is added to the steel to form a Cr-C compound which is the smallest of various carbides and is uniformly distributed in the steel, thereby providing the steel with high strength, hardness, yield point and wear resistance, and also providing good plasticity and toughness because of its fine and uniform distribution of the structure.
2. The combination of Cr and Mo increases the retained austenite content of the steel, and contributes to obtaining a carbide phase of a desired degree of pulverization. Thereby refining crystal grains, improving toughness and greatly improving hardenability.
3. After Ni element is added, it can strengthen ferrite and refine and increase pearlite, thereby improving the strength of steel. And it can reduce critical transformation temperature, reduce diffusion rate of each element in steel, thus raise hardenability.
4. Since the above functions can be realized in a low alloy range (i.e., the total amount of alloy elements is < 3%) due to the high superiority of the alloy elements of Cr, Ni, and Mo, the optimized amounts of the alloy elements of Cr and Ni are determined to be relatively small 0.1 to 0.2% in view of the cost and the weldability of the workpiece. Mo is combined with Cr and Ni to greatly improve hardenability, refine crystal grains, improve toughness and facilitate forging.
(2) The innovative production process scheme of the pump shell forging is as follows: before forging, the two pump shell forgings and the two pump body branch forgings are spliced, and particularly, a main body with a spherical section is forged by adopting a step type design. In the forging process, steel ingots are adopted for twice upsetting, after the steel ingots are drawn to the maximum size of the spherical section, triangular number printing and material separation are carried out, steps are pressed out, and a finished product is obtained after finishing (see a blank form diagram after the forging in the following diagram). After forging, the pump shell and the pump shell branches are sawed two by two. The technical scheme overcomes the defects of the traditional technical scheme, greatly reduces the cost of raw materials, and reduces a large amount of machining allowance for the subsequent machining of the spherical section. And (3) processing an inner hole of phi 229 mm by using the two pump housings together through a deep hole processing method, and finally separating the two pump housings connected together through a sawing method by using a sawing machine. The forging density of the forge piece is ensured, meanwhile, the production flow is reduced, and the manufacturing progress is accelerated.
(3) Firstly, normalizing and tempering a forged pump housing forging blank, then roughly machining the two forged pump housing forging blanks together, machining a middle deep hole to phi 210 mm, sawing the deep hole into two single parts, finally performing quenching at 880 +/-10 ℃, preserving heat for 12 hours and cooling with water for 60 minutes; the tempering adopts a heat treatment process scheme of 700 +/-10 ℃ and air cooling after 20 hours of heat preservation, so that the comprehensive mechanical property of the product is far higher than that of a pump shell forging piece in a normalizing and tempering heat treatment state, and particularly, the impact toughness value at a low temperature of-20 ℃ is more stable under the condition of meeting the standard requirement.
The technical scheme 1: a pump shell forging for a furnace water circulation pump is characterized in that (mass fraction): less than or equal to 0.25 percent of C, 0.15-0.35 percent of Si, 0.60-0.90 percent of Mn, 0.44-0.65 percent of Mo, 0.10-0.20 percent of Cr0.10-0.20 percent of Ni, less than or equal to 0.035 percent of P, and less than or equal to 0.035 percent of S.
The technical scheme 2 is as follows: a method for manufacturing a pump shell forging for a furnace water circulation pump comprises the following steps: the design technological parameters of the pump shell forging are as follows: the low-carbon alloy steel material of claim 1 is forged and formed, the weight of a forged piece is 7.18t, the material specification is 21.5t of ingot, two pump shell forged pieces and two pump body branch forged pieces are forged by one ingot, the forging ratio is 4.6, and the forging temperature is as follows: 1240 ℃ to 800 ℃; the first fire time: after the steel ingot is taken out of the furnace, a riser is pressed on a jaw, then steel ingot upsetting is carried out, after the steel ingot is upset to the diameter phi of 1680mm, a flat plate is forged, the blank is drawn out to be about 2100mm long in the eight direction of 1150mm under large reduction, and the steel ingot is returned to the furnace for heating; the second fire time: upsetting the steel ingot for the second time to diameter phi 1680mm, drawing the blank to 1130mm eight directions under large reduction of a forged flat plate, and marking and distributing the blank; drawing out the pressing table, and finishing to obtain a finished product; 2. rough machining: after forging, reserving 7.5mm allowance on the single side of the finish turning size for rough turning, and performing ultrasonic flaw detection after rough turning to ensure that the forging meets the requirements of ASTM A388& ASME III, Division II and Paragraph 3.3.4; 3. performance heat treatment: heating the finished forged piece to 880 +/-10 ℃ along with a furnace, preserving heat for 12 hours, and then cooling with water for 60 minutes; then the temperature is raised to 700 +/-10 ℃ along with the furnace, and the temperature is kept for 20 hours, and then the mixture is air-cooled and discharged from the furnace.
Compared with the background technology, the invention has the advantages that firstly, the impact toughness value measured at the temperature of-20 ℃ is stable, and the requirement that AKv is more than or equal to 27J is met; secondly, ultrasonic flaw detection of the pump shell forging piece does not find any standard exceeding defect, and all technical parameters meet or exceed the requirements specified by ASTM A388& ASME III, Division II and Paragraph 3.3.4; thirdly, the cost of raw materials is greatly reduced, and a large amount of machining allowance is reduced for the subsequent machining of the spherical section; fourthly, the two pump housings are processed into an inner hole with diameter phi of 229 mm by a deep hole processing method, and finally the two pump housings connected together are separated by a sawing method of a sawing machine. The forging density of the forge piece is ensured, meanwhile, the production flow is reduced, and the manufacturing progress is accelerated.
Drawings
FIG. 1 is a pump housing forging blank forming view.
FIG. 2 is a pump housing forging roughing sizing view.
FIG. 3 is a drawing of a pump housing forging temper heat treatment process.
Detailed Description
Example 1: a pump shell forging for a furnace water circulation pump is characterized in that (mass fraction): less than or equal to 0.25 percent of C, 0.15-0.35 percent of Si, 0.60-0.90 percent of Mn, 0.44-0.65 percent of Mo, 0.10-0.20 percent of Cr0.10-0.20 percent of Ni, less than or equal to 0.035 percent of P, and less than or equal to 0.035 percent of S.
Example 2: in addition to example 1, C0.20, si0.23, mn0.72, cr0.15, mo0.50, ni0.15, P0.007, and S0.002.
Tensile strength Rm598 MPa, yield strength ReL445 MPa, elongation A29.0%, reduction of area Z74.0%, -20 ℃ impact absorption energy Kv2182/185/132J, average value 166J.
Tensile strength Rm592 MPa, yield strength ReL435 MPa, elongation A30.0%, reduction of area Z76.0%, -20 deg.C impact absorption energy Kv2178/182/164J, mean 174J.
Example 3: reference is made to figures 1-3 of the drawings. On the basis of embodiment 1, a method for manufacturing a pump shell forging for a furnace water circulation pump, 1, a forging process: the design technological parameters of the pump shell forging are as follows: the low-carbon alloy steel material of claim 1 is forged and formed, the weight of a forged piece is 7.18t, the material specification is 21.5t of ingot, two pump shell forged pieces and two pump body branch forged pieces are forged by one ingot, the forging ratio is 4.6, and the forging temperature is as follows: 1240 ℃ to 800 ℃;
the first fire time: after the steel ingot is taken out of the furnace, a riser is pressed on a jaw, then steel ingot upsetting is carried out, after the steel ingot is upset to the diameter phi of 1680mm, a flat plate is forged, the blank is drawn out to be about 2100mm long in the eight direction of 1150mm under large reduction, and the steel ingot is returned to the furnace for heating;
the second fire time: upsetting the steel ingot for the second time to diameter phi 1680mm, drawing the blank to 1130mm eight directions under large reduction of a forged flat plate, and marking and distributing the blank; drawing out the pressing table, and finishing to obtain a finished product;
2. rough machining: after forging, reserving 7.5mm allowance on the single side of the finish turning size for rough turning, and performing ultrasonic flaw detection after rough turning to ensure that the forging meets the requirements of ASTM A388& ASME III, Division II and Paragraph 3.3.4;
3. performance heat treatment: heating the finished forged piece to 880 +/-10 ℃ along with a furnace, preserving heat for 12 hours, and then cooling with water for 60 minutes; then the temperature is raised to 700 +/-10 ℃ along with the furnace, and the temperature is kept for 20 hours, and then the mixture is air-cooled and discharged from the furnace.
It is to be understood that: although the above embodiments have described the design idea of the present invention in more detail, these descriptions are only simple descriptions of the design idea of the present invention, and are not limitations of the design idea of the present invention, and any combination, addition, or modification without departing from the design idea of the present invention falls within the scope of the present invention.
Claims (5)
1. A pump shell forging for a furnace water circulation pump is characterized in that (mass fraction%: less than or equal to 0.25 percent of C, 0.15-0.35 percent of Si, 0.60-0.90 percent of Mn, 0.44-0.65 percent of Mo, 0.10-0.20 percent of Cr0.10-0.20 percent of Ni, less than or equal to 0.035 percent of P, and less than or equal to 0.035 percent of S.
2. The pump housing forging for the boiler water circulation pump according to claim 1, wherein: c0.20, Si0.23, Mn0.72, Cr0.15, Mo0.50, Ni0.15, P0.007, S0.002.
3. The pump housing forging for the boiler water circulation pump according to claim 1, wherein: tensile strength Rm598 MPa, yield strength ReL445 MPa, elongation A29.0%, reduction of area Z74.0%, -20 ℃ impact absorption energy Kv2182/185/132J, average value 166J.
4. The pump housing forging for the boiler water circulation pump according to claim 1, wherein: tensile strength Rm592 MPa, yield strength ReL435 MPa, elongation A30.0%, reduction of area Z76.0%, -20 deg.C impact absorption energy Kv2178/182/164J, mean 174J.
5. A method for manufacturing a pump shell forging for a furnace water circulation pump is characterized by comprising the following steps:
1) the design technological parameters of the pump shell forging are as follows: the low-carbon alloy steel material of claim 1 is forged and formed, the weight of a forged piece is 7.18t, the material specification is 21.5t of ingot, two pump shell forged pieces and two pump body branch forged pieces are forged by one ingot, the forging ratio is 4.6, and the forging temperature is as follows: 1240 ℃ to 800 ℃;
the first fire time: after the steel ingot is taken out of the furnace, a riser is pressed on a jaw, then steel ingot upsetting is carried out, after the steel ingot is upset to the diameter phi of 1680mm, a flat plate is forged, the blank is drawn out to be about 2100mm long in the eight direction of 1150mm under large reduction, and the steel ingot is returned to the furnace for heating;
the second fire time: upsetting the steel ingot for the second time to diameter phi 1680mm, drawing the blank to 1130mm eight directions under large reduction of a forged flat plate, and marking and distributing the blank; drawing out the pressing table, and finishing to obtain a finished product;
2) after forging, reserving 7.5mm allowance on the single side of the finish turning size for rough turning, and performing ultrasonic flaw detection after rough turning to ensure that the forging meets the requirements of ASTM A388& ASME III, Division II and Paragraph 3.3.4;
3) performance heat treatment: heating the finished forged piece to 880 +/-10 ℃ along with a furnace, preserving heat for 12 hours, and then cooling with water for 60 minutes; then the temperature is raised to 700 +/-10 ℃ along with the furnace, and the temperature is kept for 20 hours, and then the mixture is air-cooled and discharged from the furnace.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08120398A (en) * | 1994-10-25 | 1996-05-14 | Aichi Steel Works Ltd | Non-heat treated steel for forging excellent in fatigue strength and toughness and forging method therefor |
| CN105543684A (en) * | 2015-12-23 | 2016-05-04 | 宝鼎科技股份有限公司 | Horizontal rotating base forging of adjustable propeller blade and manufacturing process of horizontal rotating base forging |
| CN107663613A (en) * | 2016-07-27 | 2018-02-06 | 株式会社日本制钢所 | The manufacture method of NiCrMo steel and NiCrMo steel |
| CN109706394A (en) * | 2018-12-31 | 2019-05-03 | 宝鼎科技股份有限公司 | Large ship cylinder cover for diesel engine and forming method |
| WO2021169941A1 (en) * | 2020-02-28 | 2021-09-02 | 宝山钢铁股份有限公司 | Chain steel for use in mine and manufacturing method therefor |
-
2021
- 2021-10-16 CN CN202111206488.XA patent/CN113957341A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08120398A (en) * | 1994-10-25 | 1996-05-14 | Aichi Steel Works Ltd | Non-heat treated steel for forging excellent in fatigue strength and toughness and forging method therefor |
| CN105543684A (en) * | 2015-12-23 | 2016-05-04 | 宝鼎科技股份有限公司 | Horizontal rotating base forging of adjustable propeller blade and manufacturing process of horizontal rotating base forging |
| CN107663613A (en) * | 2016-07-27 | 2018-02-06 | 株式会社日本制钢所 | The manufacture method of NiCrMo steel and NiCrMo steel |
| CN109706394A (en) * | 2018-12-31 | 2019-05-03 | 宝鼎科技股份有限公司 | Large ship cylinder cover for diesel engine and forming method |
| WO2021169941A1 (en) * | 2020-02-28 | 2021-09-02 | 宝山钢铁股份有限公司 | Chain steel for use in mine and manufacturing method therefor |
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