CN114210893A - Method for manufacturing large-diameter stainless steel round pipe blank - Google Patents

Method for manufacturing large-diameter stainless steel round pipe blank Download PDF

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Publication number
CN114210893A
CN114210893A CN202111494742.0A CN202111494742A CN114210893A CN 114210893 A CN114210893 A CN 114210893A CN 202111494742 A CN202111494742 A CN 202111494742A CN 114210893 A CN114210893 A CN 114210893A
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blank
forging
stainless steel
heating
continuous casting
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CN114210893B (en
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方旭东
孙铭山
夏焱
赵建伟
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Shanxi Taigang Stainless Steel Co Ltd
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Shanxi Taigang Stainless Steel Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • 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
    • B21J5/002—Hybrid process, e.g. forging following casting
    • 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
    • B21K1/00—Making machine elements
    • B21K1/14—Making machine elements fittings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K15/00—Electron-beam welding or cutting
    • B23K15/06—Electron-beam welding or cutting within a vacuum chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

The invention belongs to the field of stainless steel, and discloses a method for manufacturing a large-diameter stainless steel round pipe blank, which comprises the following steps of: the method comprises the following steps: preparing a casting blank; step two: constructing a multilayer composite blank; step three: heating with fire. The large-diameter stainless steel circular tube blank produced by the method has good internal structure and can meet the requirements of hot processing performance including subsequent forging, rolling, hot piercing, hot extrusion, hot expanding and the like.

Description

Method for manufacturing large-diameter stainless steel round pipe blank
Technical Field
The invention belongs to the field of stainless steel, and relates to a method for manufacturing a large-diameter stainless steel round pipe blank.
Background
With the rapid development of national economy, in view of safety, high efficiency and the like, the energy industries such as petroleum and petrochemical industry put forward higher quality requirements on key pipelines, such as boiler pipes, fluid conveying pipes and the like, and the large-diameter thick-wall stainless steel seamless steel pipe is in vigorous demand.
The large-diameter stainless steel round pipe blank is used as a raw material for producing a large-diameter thick-wall seamless pipe, and is produced by adopting a process of 'die-casting large-size steel ingots and forging' at present. Compared with carbon steel and low alloy steel, stainless steel has the characteristics of high alloy content and poor molten steel fluidity, the inevitable shrinkage cavity generated at the head of the steel ingot is more serious with the increase of the size of the cast steel ingot, and when key process parameters such as casting temperature, casting speed and the like are controlled unreasonably, secondary shrinkage cavity is generated outside the serious shrinkage cavity near a riser of the steel ingot, and the secondary shrinkage cavity can penetrate through the head and the tail of the steel ingot to cause the rejection of the steel ingot. When the forging ratio (or the compression ratio) is controlled unreasonably or the heating temperature or heating is uneven in the steel ingot forging process (especially for the tube blank products with the specification of more than or equal to phi 375 mm), the defects can not be welded effectively, but are kept in the round tube blank continuously to form residual shrinkage cavities or layered defects, so that the problems of poor uniformity of internal tissues of the round tube blank, low flaw detection qualification rate and the like are caused, and the production difficulty of subsequent tube making is increased.
The construction of a multi-layer composite blank is commonly seen in the production of composite plates, and generally refers to the production of composite plates from two (layers) of materials with different materials and properties by adopting an explosion method or a rolling method. Different from a composite plate rolling process, a circular tube blank (or a section) is produced by composite forging, and in the blank making links such as forging or rolling, the influence of the size of a workpiece and a deformation process needs to be considered, so that the production process needs to be carried out by using a multi-layer continuous casting blank compounding method. In addition, the compounded round pipe blank (or profile) also needs to meet various deformation requirements of subsequent forging (or rolling), hot piercing, hot extrusion, hot expansion and the like, wherein the most severe deformation process is the deformation process of multi-axis alternating shear stress borne by the material in the hot piercing process, and the hot piercing cracking and the scrapping are easily caused. By referring to relevant data, the method is still blank internationally in the aspect of multilayer compounding, and particularly in the aspect of stainless steel, experience and cases can not be referred.
Disclosure of Invention
The invention aims to solve the problems and provides a method for manufacturing a large-diameter stainless steel round pipe blank.
The purpose of the invention is realized as follows: a method for manufacturing a large-diameter stainless steel round pipe blank comprises the following steps: the method comprises the following steps: preparing a casting blank: selecting a continuous casting slab with a proper specification according to the specification of the finished pipe blank, and cleaning the surface of the continuous casting slab to be constructed;
step two: constructing a multilayer composite blank: welding the continuous casting plate blank by adopting a vacuum electron beam welding method, wherein the single-side welding width is 40-70mm, and the aspect ratio of the deep-built multilayer composite blank is 0.5-2.49;
step three: heating by using a fire: heating to a target temperature before upsetting, wherein the target temperature is 100 ℃ below a solidus and 150 ℃, and the heat preservation time is 1.0min/mm-1.5min/mm according to the cross section size;
step four: forging: the method is characterized by adopting processes of upsetting and forging drawing for production, returning to a furnace after upsetting for multi-fire heat compensation, wherein the heating temperature is consistent with the target temperature of one-fire heating, the time is 1-1.5min/mm, forging drawing is carried out after multi-fire heat compensation, the initial deformation of forging drawing is less than or equal to 5%, a workpiece after upsetting is forged into a square shape or an octagonal shape, and then subsequent forging is carried out.
Furthermore, the requirement of the continuous casting slab in the step one is that the machined surface smoothness is Ra less than or equal to 3.4 μm.
Further, the surface of the continuously cast slab planned to be constructed is cleaned with acetone or ethanol.
And further, in the second step, the vacuum electron beam welding method is adopted, namely, the continuous casting plate blank which is planned to be constructed is placed into a vacuum chamber, the vacuum degree of the vacuum chamber is pumped to be less than or equal to 30Pa, and after the vacuum chamber is maintained for 10min-2h, the continuous casting plate blank is welded block by adopting an electron beam welding gun.
The invention has the beneficial effects that: the large-diameter stainless steel circular tube blank produced by the method has good internal structure and can meet the requirements of hot processing performance including subsequent forging, rolling, hot piercing, hot extrusion, hot expanding and the like.
Detailed Description
In order to overcome the defects of the existing method for processing the large-diameter stainless steel round pipe blank, the invention provides a method for manufacturing the large-diameter stainless steel round pipe blank by constructing a multi-layer composite blank and controlling key process parameters in the forming process.
The invention provides a manufacturing method which adopts a stainless steel continuous casting plate blank with mature process, stable quality and good economical efficiency as a raw material, constructs a multi-layer continuous casting plate blank into a composite blank through vacuum welding, and then processes the constructed composite blank into a large-diameter stainless steel round pipe blank by adopting a forging process of upsetting and drawing. The overall process flow is as follows: casting blank preparation → construction of multilayer composite blank → heating → forging → inspection → packaging → delivery. The details are as follows.
Preparation of casting blank
Compared with the traditional process, the invention adopts the stainless steel continuous casting plate blank with mature process, stable quality and good economical efficiency as the raw material. Compared with the mold injection process, the molten steel solidification speed of the continuous casting process is far higher than that of the mold injection process, in addition, the continuous casting process can implement cooling with different strengths at different stages of casting blank solidification, and the reasonable use of one or more combined electromagnetic stirring technical measures including a crystallizer, a secondary cooling section and a solidification tail end, and the control capability of the continuous casting blank on the internal quality and the appearance quality is far higher than that of the mold injection. Therefore, the stainless steel continuous casting plate blank with mature process, stable quality and good economy is adopted as the raw material of the composite blank to be constructed, and the solidification defects of shrinkage cavity, layering and the like existing in the traditional large-size steel ingot can be improved from essence, so that the quality of the real object is improved.
The size and specification of the casting blank preparation are according to the specification of the finished product of the tube blank, and the continuous casting plate blank with the proper specification is selected according to the forging ratio of more than 3. And cleaning the surface of the casting blank which is planned to be constructed. The requirements are as follows: the smoothness of the machining surface is that Ra is less than or equal to 3.4 mu m; the machined surface is cleaned with a similar cleaning agent such as acetone or ethanol.
Construction of multi-layer composite blanks
The multilayer composite billet is formed by manufacturing two or more layers of continuous casting billets into raw material billets before hot processing by adopting an electron beam welding method under the vacuum condition. The traditional composite billet mainly welds the periphery of a steel billet planned to be welded, a notch is reserved at a certain position in the later welding stage, and the notch is welded and blocked after air between the welded steel billets is completely pumped by using a vacuum pump at the notch. The process has the advantages of simple process and low cost, but the problems of incomplete evacuation, fluctuation of batch quality of each composite blank and small quantity of weldable composite easily occur in the actual production process, and the process does not have stable batch production conditions. The invention provides a method for constructing a multilayer composite blank by vacuum electron beam welding, which comprises the steps of firstly placing a continuously cast blank to be constructed in a vacuum chamber, vacuumizing the vacuum chamber, keeping the vacuum chamber for a certain time under the vacuum condition, and then welding the periphery of the continuously cast blank to be constructed into the multilayer composite blank by adopting a vacuum electron beam welding gun block by block. The multilayer composite blank constructed by the method can solve the problems of incomplete evacuation and quality fluctuation frequently occurring in the local vacuum-pumping process after the casting blank is welded, and has stable production conditions in large batch.
According to the results of multiple tests and repeated practices, when a multilayer composite blank is constructed, the ultimate vacuum degree of a vacuum chamber is less than 67Pa, and the holding time under the ultimate vacuum degree before welding is more than 10 min. The electron beam welding is adopted, the single-side welding depth of the casting blank is 40-70mm, the quantity of the constructed multilayer composite blanks is determined according to the height-width ratio of the constructed multilayer composite blanks after welding, and the width-width ratio of the constructed multilayer composite blanks after welding is no more than 2.5.
Heating of
The heating process of the multilayer composite blank has different requirements from the traditional heating process. The traditional heating process aims to heat the material to the optimal deformation temperature and ensure that the material deforms under the condition of good natural plasticity. The heating purpose of the invention is to ensure that a plurality of (layer of) welded casting blanks are compounded into a whole after the composite blank is deformed subsequently, and simultaneously, the key process of converting the fibrous structure of the material from the as-cast structure to the hot processing into the purpose is completed. The selection of proper heating temperature and holding time are key parameters for ensuring the heating quality. If the heating temperature is too high, the composite blank is easy to overheat or overburn, so that heating waste products are generated; if the temperature is lower, the welding composite blank can not be ensured to have better recombination rate after hot processing, small-size layering and staggered-layer defects are easily generated locally, and the composite workpiece is scrapped due to poor local recombination and low recombination rate when the defects are serious.
The heating process can be divided into one-time heating and multi-fire heat compensation according to different deformation purposes. The first heating refers to the first heating before upsetting, the target heating temperature is 100-150 ℃ below the solidus of the material, the heat preservation time is more than or equal to 1.0min/mm but less than 1.5min/mm according to the cross section size, and the heating speed is executed according to the conventional process. The multi-fire heat compensation refers to heat compensation in the heating process after upsetting and the subsequent forging (rolling) process, so as to ensure that the material has better thermoplasticity as the destination heating, the heating temperature is the same as the heating target temperature before upsetting, and the time is more than or equal to 1h (the heat preservation time is more than or equal to 0.1min/mm according to the section size).
Forging
In order to ensure that the multilayer composite blank has high recombination rate and good structure and performance, the forging process adopts the process of upsetting and forging drawing-out. Wherein, the upsetting process is a key process for ensuring high recombination rate of a plurality of (layer) casting blanks. The bottom areas of the workpieces which can be upset are different according to the different effective working surface areas of the hammer head and the anvil of the forging machine, and the workpieces can be upset for one time or more in the upsetting process, so that the bottom areas of the workpieces after upsetting are required to be located in the effective working surface areas of the hammer head and the anvil. The forging and drawing process is a process of forging the upset composite blank into a round tube blank with a target dimension specification. The method is very important for controlling the initial pass of drawing in the process, and the deformation amount of the initial pass is properly controlled, so that the cracking generated in the forging process of the workpiece can be reduced, and the yield is improved.
Through practice, the deformation control key points in the forging process are as follows: the upsetting deformation is more than or equal to 30 percent (the upsetting deformation is (height of a forged piece before forging-height of a blank after forging)/height of the blank before forging). Forging and drawing to obtain a workpiece with initial deformation less than or equal to 5%, and forging the workpiece into a square or octagonal shape; the subsequent forging (rolling) is performed according to a conventional process.
Inspection, packaging, delivery
Produced according to the conventional process of factories.
In summary, the invention provides a method for manufacturing a large-diameter stainless steel round pipe blank, which is characterized by comprising the following steps: according to the hot processing characteristics of the alloy, the process of casting blank preparation → construction of a multi-layer composite blank → heating → forging → inspection → packaging → delivery is adopted to control the key processes of casting blank size, casting blank surface finish and cleanliness, vacuum degree of a vacuum furnace used for constructing the multi-layer composite blank, holding time under the vacuum degree, heating temperature, heating time, upsetting deformation, forging drawing initial deformation and the like, so that the large-diameter stainless steel circular tube blank with good internal structure and processability is prepared.
Examples
1. A method for manufacturing a large-diameter stainless steel round pipe blank comprises the following general process flows: casting blank preparation → construction of multilayer composite blank → heating → forging → inspection → packaging → delivery.
2. A method for manufacturing a large-diameter stainless steel round pipe blank comprises the following steps:
(1) preparing a casting blank: and selecting a continuous casting slab with a proper specification according to the specification of the finished pipe blank, and cleaning the surface of the casting blank which is planned to be constructed. The requirements are as follows: the smoothness of the machining surface is that Ra is less than or equal to 3.4 mu m; the machined surface is cleaned with acetone or similar cleaning agents.
(2) Constructing a multilayer composite blank: and (3) welding the composite blank by adopting a vacuum electron beam welding method, wherein the height-to-width ratio of the multi-layer composite blank constructed by the depth of 40-70mm of the single-side welding width is not more than 2.5.
(3) Forging: the steel is produced by adopting a process of upsetting and forging drawing. Heating the target temperature before upsetting, wherein the temperature is 100 ℃ below the solidus and 150 ℃, the heat preservation time is more than or equal to 1.0min/mm and less than 1.5min/mm according to the cross section size, and the heating speed is executed according to the conventional process. Upsetting deformation: not less than 30 percent. The workpiece is heated in a furnace after upsetting, the heating temperature is the same as the heating target temperature before upsetting, the time is more than or equal to 1h (more than or equal to 0.1 min/mm), the initial deformation of the forging drawing is less than or equal to 5 percent, and the workpiece after upsetting is forged into a square shape or an octagonal shape; the subsequent forging is performed according to a conventional process.
Example one
The specification of the tube blank is phi 600mm plus 8000mm, the material is 304, and the total process route is as follows: casting blank preparation → construction of multilayer composite blank → heating → forging → inspection → packaging → delivery. The method comprises the following specific steps:
1. preparing a casting blank: according to the specification of finished products, the specification (200) of the continuous casting slab is selected according to the requirements that the forging ratio is more than 3 and the width-height ratio of the composite blank is not more than 2.5±0.5 *900±0.5 *8000±0.5mm), machining the planned composite surface of the casting blank, wherein the surface is smooth and has Ra less than or equal to 2.5 mu m, and casting the machined composite surface by adopting acetoneAnd cleaning the surface of the blank.
2. Constructing a multilayer composite blank: putting the continuously cast blank which is planned to be constructed into a vacuum chamber, pumping the vacuum degree of the vacuum chamber to 30Pa, keeping the vacuum chamber for 20min, welding the continuously cast blank piece by adopting an electron beam welding gun, wherein five pieces are welded into a group, the depth of a single-side welding seam is 60mm, and the size of the multi-layer composite blank after welding is as follows: 998 x 900 x 8020 mm.
3. Heating: the target temperature is 1295 ℃ + -10 ℃ (304 solidus temperature 1435 ℃), and the heating time is 1350 min. The second time of the melting back heating is 1295 +/-10 ℃, and the holding time is 90 min.
4. Forging: the steel is produced by adopting a process of upsetting and forging drawing. Upsetting deformation: 40 percent. The deformation of the initial pass of forging and drawing is 3 percent.
Example two
The specification of the tube blank is phi 500mm plus 8000mm, the material TP310, the total process route is as follows: casting blank preparation → construction of multilayer composite blank → heating → forging → inspection → packaging → delivery. The method comprises the following specific steps:
1. preparing a casting blank: according to the specification of finished products, the specification (200) of the continuous casting slab is selected according to the requirements that the forging ratio is more than 3 and the width-height ratio of the composite blank is not more than 2.5±0.5 *900±0.5 *8000±0.5mm), machining the planned composite surface of the casting blank, wherein the surface finish Ra is less than or equal to 2.0 mu m, and cleaning the surface of the machined casting blank by using acetone.
2. Constructing a multilayer composite blank: putting the continuously cast blank which is planned to be constructed into a vacuum chamber, pumping the vacuum degree of the vacuum chamber to 30Pa, keeping the vacuum chamber for 15min, welding the cast blank piece by adopting an electron beam welding gun, welding four pieces into a group, wherein the depth of a single-side welding seam is 60mm, and the size of the multi-layer composite blank after welding is as follows: 800 x 900 x 8020 mm.
3. Heating: the target temperature is 1240 ℃ plus or minus 10 ℃ (TP 310 solidus temperature 1372 ℃), and the heating time is 1200 min. The second time of the melting back heating is 1240 +/-10 ℃, and the holding time is 80 min.
4. Forging: the steel is produced by adopting a process of upsetting and forging drawing. Upsetting deformation: 35 percent. The deformation of the initial pass of forging and drawing is 3 percent.
EXAMPLE III
The specification of the tube blank is phi 800mm 10000mm or more, the material TP316L, and the total process route is as follows: casting blank preparation → construction of multilayer composite blank → heating → forging → inspection → packaging → delivery. The method comprises the following specific steps:
1. preparing a casting blank: according to the specification of finished products, the specification (200) of the continuous casting slab is selected according to the requirements that the forging ratio is more than 3 and the width-height ratio of the composite blank is not more than 2.5±0.5 *1200±0.5 *8000±0.5mm), machining the planned composite surface of the casting blank, wherein the surface finish Ra is less than or equal to 1.5 mu m, and cleaning the surface of the machined casting blank by using acetone.
2. Constructing a multilayer composite blank: putting the continuously cast blank which is planned to be constructed into a vacuum chamber, pumping the vacuum degree of the vacuum chamber to 15Pa, keeping the vacuum chamber for 30min, welding the continuously cast blank piece by adopting an electron beam welding gun, welding seven pieces into a group, welding a single-side weld joint with the depth of 60mm, and welding the multi-layer composite blank with the size as follows: 1400 × 1200 × 8020 mm.
3. Heating: the target temperature is 1290 +/-10 ℃ (the TP310 solidus temperature is 1430 ℃), and the heating time is 1600 min. The second time of the melting back heating is 1290 +/-10 ℃, and the holding time is 150 min.
4. Forging: the steel is produced by adopting a process of upsetting and forging drawing. Upsetting deformation: 50 percent. The deformation of the initial pass of the forging drawing is 3.4 percent.
According to the technical performance and the operational performance characteristics of the large-diameter stainless steel round pipe blank, the invention controls the key processes of casting blank preparation, vacuum degree of a welding vacuum chamber, vacuum degree maintaining time, welding depth of an electron beam welding seam, heating temperature, heating time, upsetting deformation, forging drawing initial deformation and the like, so that the prepared large-diameter stainless steel round pipe blank has good internal structure and can meet the requirements of hot processing performance including subsequent forging, rolling, hot piercing, hot extrusion, hot expanding and the like.
The above description is only an embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.

Claims (4)

1. A method for manufacturing a large-diameter stainless steel round pipe blank is characterized by comprising the following steps: the method comprises the following steps: the method comprises the following steps: preparing a casting blank: selecting a continuous casting slab with a proper specification according to the specification of the finished pipe blank, and cleaning the surface of the continuous casting slab to be constructed;
step two: constructing a multilayer composite blank: welding the continuous casting plate blank by adopting a vacuum electron beam welding method, wherein the single-side welding width is 40-70mm, and the aspect ratio of the deep-built multilayer composite blank is 0.5-2.49;
step three: heating by using a fire: heating to a target temperature before upsetting, wherein the target temperature is 100 ℃ below a solidus and 150 ℃, and the heat preservation time is 1.0min/mm-1.5min/mm according to the cross section size;
step four: forging: the method is characterized by adopting processes of upsetting and forging drawing for production, returning to a furnace after upsetting for multi-fire heat compensation, wherein the heating temperature is consistent with the target temperature of one-fire heating, the time is 1-1.5min/mm, forging drawing is carried out after multi-fire heat compensation, the initial deformation of forging drawing is less than or equal to 5%, a workpiece after upsetting is forged into a square shape or an octagonal shape, and then subsequent forging is carried out.
2. The method for manufacturing the large-diameter stainless steel round pipe billet according to the claim 1 is characterized in that: the requirement of the continuous casting slab in the step one is that the machined surface finish Ra is less than or equal to 3.4 mu m.
3. The method for manufacturing the large-diameter stainless steel round pipe billet according to the claim 1 is characterized in that: and cleaning the surface of the continuously cast slab planned to be constructed by adopting acetone or ethanol.
4. The method for manufacturing the large-diameter stainless steel round pipe billet according to the claim 1 is characterized in that: and step two, adopting a vacuum electron beam welding method, namely putting the planned and constructed continuous casting plate blank into a vacuum chamber, pumping the vacuum degree of the vacuum chamber to be less than or equal to 30Pa, keeping for 10min-2h, and then welding the continuous casting plate blank block by adopting an electron beam welding gun.
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CN111283125A (en) * 2018-12-10 2020-06-16 天津天大高芯科技有限公司 Process method for producing core rod by directly forging continuous casting billet
CN109894473A (en) * 2019-04-03 2019-06-18 江阴华润制钢有限公司 A kind of method that continuous casting billet directly forges production hot die steel
CN112139763A (en) * 2020-09-07 2020-12-29 山东钢铁集团日照有限公司 Manufacturing method of high-carbon equivalent high-alloy super-thick steel plate
CN112935708A (en) * 2020-12-14 2021-06-11 伊莱特能源装备股份有限公司 Manufacturing process of ultra-large wheel belt forge piece
CN113399461A (en) * 2021-06-15 2021-09-17 山西太钢不锈钢股份有限公司 Method for processing niobium-containing austenitic heat-resistant stainless steel round pipe billet

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