CN113249642B - Large-thickness SA299GrB steel plate for steam drum end socket and manufacturing method thereof - Google Patents
Large-thickness SA299GrB steel plate for steam drum end socket and manufacturing method 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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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
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
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- 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
Abstract
The invention relates to a large-thickness SA299GrB steel plate for a steam drum end socket and a manufacturing method thereof, wherein the steel plate comprises the following chemical components in percentage by mass: c:0.20 to 0.27 percent; si:0.10-0.30%; mn:1.30-1.50%; p: less than or equal to 0.010 percent; s: less than or equal to 0.005 percent; al: not less than 0.030%; ni:0.30-0.40%; cr + Mo:0.25 to 0.32 percent; nb:0.035 to 0.040 percent; ni, mo, cr and Cu are less than or equal to 1.0 percent; h is less than or equal to 1ppm; as + Sb + Bi + Sn + Pb is less than or equal to 0.10 percent; the balance being Fe and unavoidable impurities. The smelting process of the steel grade adopts a converter, LF external refining, RH vacuum treatment, CC continuous casting blank with the thickness specification of 450mm, blank stack slow cooling, blank compounding and blank stack slow cooling; the rolling process adopts soaking pit heating-differential temperature rolling-temperature control rolling process for production; the heat treatment process adopts normalizing heat treatment by a trolley furnace. The SA299GrB steel plate with the thickness of 150-210mm for the steam pocket end socket meets the requirements of ASME SA299 in performance.
Description
Technical Field
The invention relates to a large-thickness SA299GrB steel plate for a steam drum end socket and a manufacturing method thereof. Belongs to the technical field of large-thickness (150-210 mm) carbon steel plates.
Background
The SA299GrB is a steel plate widely applied to the field of steam drums, and the steam drum mainly comprises two parts, namely a seal head and a cylinder body. The conventional SA299GrB steel plate is manufactured, and is delivered in a normalized or normalized and tempered state, and the normalizing temperature range is usually 860-910 ℃ (higher than the Ac3 temperature by 30-80 ℃). If the steel plate is used for manufacturing the end socket, the subsequent end socket manufacturing process is to press the end socket by the steel plate at high temperature, and then attempt to recover the performance of the steel plate through normalizing or normalizing plus tempering.
Along with the increasing volume of the steam drum, the thickness of a steel plate for manufacturing the end socket is correspondingly increased, and the current thickest end socket exceeds 150mm; the increase of the thickness also leads to the increase of the deformation resistance of the steel plate, is limited by the pressing capability of the end socket press, and the steel plate must be heated to a high enough temperature, usually reaching 960 ℃ or even higher, so as to reduce the deformation strength of the steel plate and be beneficial to the press forming of the end socket; if the end socket after the compression molding is subjected to water cooling at high temperature, the molded end socket is easy to deform irreversibly, so that the end socket is cooled in air after being subjected to compression deformation.
If the conventional SA299GrB steel plate is used for manufacturing the steam pocket end socket, the actual heating temperature for pressing the end socket by the steel plate is already higher than the normalizing temperature of the steel plate in the manufacturing process and is far higher than the Ac3 temperature, the grains of the end socket steel plate grow rapidly due to long-time high-temperature heating, the structure coarsening phenomenon is obvious, and even if the conventional normalizing or normalizing plus tempering heat treatment process is adopted subsequently, the performance of the steel plate is expected to be obviously changed compared with the performance of a base metal; then, the mechanical property of the pressed seal head can not be continued by the mechanical property of the steel plate, even the original mechanical property of the steel plate can not be referred to, that is, the conventional large-thickness SA299GrB steel plate base metal is not suitable for manufacturing the seal head, and the requirement of redesigning the steel plate for manufacturing the large-thickness steam pocket seal head is met.
Lin Mingxin et al (entitled "production method of SA299 steel plate for steam drum of power station boiler", no. CN 102851473B; "development of Steel plate for steam drum of dancing Steel SA299GrA boiler", wide and Thick plate ", 2013.1) use steel ingot as raw material, develop 299 SA steel plate for cylinder, and study it, the result shows that the property of SA299GrA steel plate with thickness of 165mm and simulating postweld heat treatment state can meet the ASME SA299 requirement. Yang Hongquan and other scholars (SA 299 special thick plate performance test research, electric welder, 2010.2) have studied SA299GrA steel plate for cylinder with 178mm thickness specification, and the results show that the high-temperature tensile strength is yet to be improved.
The scholars make outstanding contribution to the development of the steam-wrapped plate, but we should see that (1) the developed product is mainly of SA299GrA grade, and the strength grade of the SA299GrA grade is lower than that of the SA299GrB grade; (2) these contributions have mainly been focused on the field of large-thickness drum bodies, while in the field of drum heads, no literature report has been found; (3) the steel ingot is adopted as the steel plate raw material for production, and no other raw material literature reports are found.
Aiming at the problems, the patent provides a novel 150-210mm large-thickness SA299GrB steel plate used in the field of steam drum end sockets; from the use angle, more preference is given to ensuring the performance of the end socket after the large-thickness steel plate is pressed at high temperature and subjected to thermal forming; from the product manufacturing perspective, the patent innovatively proposes to utilize the composite blank as a raw material.
Disclosure of Invention
The invention aims to solve the technical problem of providing the SA299GrB steel plate for the steam drum end socket with large thickness (150-210 mm) and the manufacturing method thereof aiming at the prior art, and the invention ensures the performance of the end socket after the large-thickness steel plate is pressed and hot-formed at high temperature.
The technical scheme adopted by the invention for solving the problems is as follows: a large-thickness SA299GrB steel plate for a steam drum end socket comprises the following chemical components in percentage by mass: c:0.20 to 0.27 percent; si:0.10-0.30%; mn:1.30-1.50%; p: less than or equal to 0.010 percent; s: less than or equal to 0.005 percent; al: not less than 0.030%; ni:0.30-0.40%; cr + Mo:0.25-0.32%; nb:0.035 to 0.040 percent; ni, mo, cr and Cu are less than or equal to 1.0 percent; h is less than or equal to 1ppm; as + Sb + Bi + Sn + Pb is less than or equal to 0.10 percent; the balance being Fe and unavoidable impurities.
The steel plate has the following chemical composition design principle:
carbon: carbon is the main strengthening element in steel, and in the patent, the content of carbon is 0.20-0.27%, and the main consideration is to ensure the strength of the steel plate.
Niobium: the niobium has extremely strong bonding capacity with carbon and nitrogen, forms second phase particles of Nb (C, N), refines crystal grains in the controlled rolling process and prevents the structure from coarsening; because the steel plate is used in the field of large-thickness end sockets, the hot forming temperature of the end sockets is high, and more Nb (C, N) second-phase particles are needed to participate, the niobium content in the steel plate is designed to be 0.035-0.040%.
Nickel: the nickel and the iron can be dissolved in each other infinitely, are elements capable of improving low-temperature toughness obviously, have obvious influence on impact toughness and ductile-brittle transition temperature, and the content of the elements in the patent is designed to be 0.30-0.40%.
Chromium and molybdenum: the chromium and the molybdenum can improve the strength of the steel plate, particularly the mechanical property at high temperature, the content of the Cr and the Mo is controlled to be 0.30-0.32%, and the mechanical property stability of the SA299GrB end socket steel plate in the high-temperature service process is mainly ensured.
Copper: copper dissolves in ferrite and precipitates in the SA299GrB steel sheet, and a strengthening effect is produced.
The smelting process of the steel grade adopts a converter, LF external refining, RH vacuum treatment, CC continuous casting blank with the thickness specification of 450mm, blank stacking and slow cooling, blank compounding and blank stacking and slow cooling.
The rolling process adopts soaking pit heating, differential temperature rolling and temperature control rolling.
The heat treatment process adopts normalizing heat treatment by a trolley furnace.
Preparing smelting raw materials according to the chemical composition, sequentially carrying out KR molten iron pretreatment, converter top and bottom combined blowing smelting, LF external refining, RH vacuum refining, ca treatment and continuous casting to produce high-purity molten steel, and producing a continuous casting plate blank with low center segregation and porosity and 450mm thickness by using an optimized continuous casting process to prepare for subsequent steel plate compounding.
And (3) carrying out further expanding H treatment on the blank with a warm cover, slowly cooling the blank to 150-250 ℃, taking out the blank, milling the surface, trimming, and compounding two continuous casting billets into a plate blank with the thickness of 880mm by utilizing vacuum electron beam welding, so that the requirement of minimum triple compression ratio of ASME is met. Compared with the conventional steel ingot, the composite billet has better internal quality, higher yield and lower production cost; compared with a continuous casting billet, the composite billet is larger in thickness, and a thicker steel plate can be produced.
Heating the composite blank in a soaking furnace, heating the high-temperature section to 1180-1280 ℃, preserving heat for 8-10 hours, and promoting the composite surface to form a primary metallurgical bonding surface under the combined action of atom diffusion and tissue phase change under the action of high temperature and phase change.
When the conventional continuous casting billet is used for rolling an extra-thick steel plate, the compression deformation in the thickness direction is difficult to penetrate into the center of the plate blank, so that the deformation of the center of the plate blank is very small, and even no plastic deformation exists. After the composite plate blank is taken out of the furnace, the rolling force is strived to permeate the core part of the steel plate, so the rolling process of the composite plate blank is divided into two stages for rolling.
Step I, reducing the surface temperature of the plate blank by using high-pressure water, wherein the surface cooling rate of the plate blank is more than or equal to 15 ℃/s, so that the upper surface layer and the lower surface layer in the thickness direction of the plate blank are in a low-temperature state, and the central layer still maintains a high-temperature distribution state; the temperature of the upper surface and the lower surface is lower than that of the core, the deformation resistance is large, the steel plate is not easy to deform, the core temperature is high, the steel plate is easy to deform, the deformation penetrates into the core of the steel plate during rolling, the fusion of a composite surface is promoted, and the overall performance, particularly the core performance, of the super-thick steel plate is further improved.
In the stage II, the initial rolling temperature is 960-980 ℃, and the initial rolling temperature is mainly matched with the end socket hot forming temperature; the stage is a finish rolling stage; refining grains by the pinning effect of Nb (C, N); after rolling, controlled cooling; and (5) taking the line down.
Off-line normalizing the off-line steel plate, wherein the normalizing is carried out in a trolley furnace at 860-910 ℃ for 1.5-2.5min/mm, and the steel plate is air-cooled after being discharged.
The invention uses reasonable chemical component design aiming at the urgent need of the SA299GrB steel plate for the large-thickness steam drum end socket; producing a composite blank with the thickness specification of 880 mm; differential hot rolling is adopted in the rough rolling stage, the starting rolling temperature in the finish rolling stage is 960-980 ℃, and the temperature is higher than the heating temperature of the end enclosure, so that the SA299GrB steel plate for the steam pocket end enclosure with the thickness of 150-210mm is manufactured.
The obtained steel plate has good delivery state and performance after thermal forming of a simulated seal head, the components and mechanical properties meet the quality requirement of an ASME SA299 product, wherein the yield strength Rel is more than or equal to 310Mpa, the tensile strength Rm is 550-690Mpa, and the elongation rate A is 50 Not less than 20 percent; in addition, the 350 ℃ high-temperature tensile property meets the S7 additional requirement of ASME, and Rp0.2 is more than or equal to 517MPa.
Compared with the prior art, the invention has the advantages that:
1) The composite addition technology of Cr, mo, ni and Cu is adopted to improve the room temperature strength and the high temperature strength of the steel plate.
2) The content of Nb is 0.035-0.040, and the content of Nb (C, N) second phase particles in the reinforced steel is added.
3) The composite blank is adopted as a plate rolling raw material, and compared with a continuous casting blank, the composite blank can be used for producing a thicker steel plate and meets the requirement of the minimum triple compression ratio of ASME; compared with steel ingots, the composite blank has better internal quality, higher yield and lower production cost.
4) The SA299GrB steel plate with the thickness of 150-210mm and used for the steam pocket end socket manufactured by the steel plate meets the requirements of ASME SA 299.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
The steel sheet of example 1 had a thickness of 165mm.
The production process of the SA299GrB steel plate for the drum head with the thickness of 165mm comprises the following steps:
preparing smelting raw materials according to the chemical composition of the steel plate, and sequentially performing KR molten iron pretreatment, BOF converter smelting, LF external refining, RH vacuum refining, 450mm continuous casting, continuous casting billet covering slow cooling, continuous casting billet compounding, composite billet slow cooling, blank charging and heating, blank high-temperature heat preservation treatment, blank discharging, slab high-pressure water descaling and cooling control, rough rolling, finish rolling, steel plate cooling control and steel plate heat treatment.
And (3) covering and stacking the high-temperature slab out of the continuous casting machine for slow cooling, wherein the covering inlet temperature is not lower than 900 ℃, the slow cooling time is not lower than 96H, the covering outlet temperature is 150-250 ℃, and the slow cooling step aims at reducing the H content in the steel.
And (4) compounding the continuous casting plate blank after the cover is taken out by using a vacuum electron beam welding mode to form a composite plate blank with the thickness of 880 mm.
The specific process of the heating, controlled rolling and cooling stages for rolling the composite blank into the steel plate comprises the following steps: heating the blank to 1180-1280 ℃, preserving heat for 10 hours, removing scale by high-pressure water after discharging, and controlling cooling to 1100 +/-20 ℃ within 20 seconds; then, the steel is rolled in two stages, wherein the finish rolling start temperature is 972 ℃, and the start rolling thickness is 231mm; and (4) cooling the rolled steel plate to below 662 ℃.
And (3) putting the completely cooled steel plate into a trolley furnace for normalizing heat treatment, wherein the heating temperature is 900 +/-10 ℃, the furnace time is 360min, and the steel plate is cooled in static air after the heating time is up.
The finished steel plates obtained by the manufacturing process are excellent in comprehensive performance, and the details are shown in tables 1-4.
Example 2
Example 2 relates to a steel sheet having a thickness of 185mm.
The production process of the SA299GrB steel plate for the drum head with the thickness specification of 185mm comprises the following steps:
steel plate making and slab stacking slow cooling and compounding are consistent with example 1.
The specific process of the heating, controlled rolling and cooling stages for rolling the composite blank into the steel plate comprises the following steps: heating the blank to 1180-1280 ℃, preserving heat for 9 hours, removing scale by high-pressure water after discharging, and controlling cooling to 1100 +/-20 ℃ within 20 seconds; then rolling in two stages, wherein the finish rolling initial rolling temperature is 967 ℃, and the initial rolling thickness is 259mm; and (5) controlling the cooling of the rolled steel plate to be lower than 653 ℃.
And (3) putting the completely cooled steel plate into a trolley furnace for normalizing heat treatment, heating at 900 +/-10 ℃, keeping the furnace for 400min, and cooling in static air after the time.
The finished steel plates obtained by the manufacturing process are excellent in comprehensive performance, and the details are shown in tables 1-4.
Example 3
Example 3 relates to a steel sheet having a thickness of 210mm.
The production process of the SA299GrB steel plate for the steam pocket end socket with the thickness of 210mm comprises the following steps:
steel plate making and slab stacking slow cooling and compounding are consistent with example 1.
The specific process of the heating, controlled rolling and cooling stages for rolling the composite blank into the steel plate comprises the following steps: heating the blank to 1180-1280 ℃, preserving heat for 10 hours, removing scale by high-pressure water after discharging, and controlling cooling to 1100 +/-20 ℃ within 20 seconds; then rolling in two stages, wherein the initial rolling temperature of finish rolling is 971 ℃, and the initial rolling thickness is 284.5mm; and (4) cooling the rolled steel plate to the temperature of 660 ℃ below the line.
And (3) putting the completely cooled steel plate into a trolley furnace for normalizing heat treatment, heating at 900 +/-10 ℃, keeping the furnace for 450min, and cooling in static air after the time.
The finished steel plates obtained by the manufacturing process are excellent in comprehensive performance, and the details are shown in tables 1-4.
TABLE 1 analysis of chemical composition (wt%) of finished steel sheet
| C | Si | Mn | P | S | Ni | Al | Nb | Cr+Mo | |
| Example 1 | 0.27 | 0.23 | 1.46 | 0.008 | 0.001 | 0.36 | 0.035 | 0.036 | 0.32 |
| Example 2 | 0.27 | 0.24 | 1.49 | 0.009 | 0.001 | 0.38 | 0.036 | 0.038 | 0.31 |
| Example 3 | 0.28 | 0.23 | 1.47 | 0.008 | 0.001 | 0.36 | 0.039 | 0.037 | 0.32 |
TABLE 2 mechanical Properties of delivery Steel sheets
TABLE 3 simulation of mechanical properties of steel plate after head thermoforming
Note: the simulation end socket thermal forming process sequentially comprises the following steps: (1) simulating the thermal forming temperature to 970 ℃, keeping the temperature for 1.5min/mm, and air-cooling; (2) normalizing the recovery performance at 900 ℃, keeping the temperature for 2min/mm, and cooling in air.
TABLE 4 high temperature tensile Properties at 350 ℃ of the Steel sheets
Note: the simulation end socket thermal forming process sequentially comprises the following steps: (1) simulating the thermal forming temperature to 970 ℃, keeping the temperature for 1.5min/mm, and air-cooling; (2) normalizing the recovery performance at 900 ℃, keeping the temperature for 2min/mm, and cooling in air.
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.
Claims (1)
1. The utility model provides a steam pocket head is with 210mm thick SA299GrB steel sheet which characterized in that: the steel plate comprises the following chemical components in percentage by mass: c:0.28 percent; si:0.23 percent; mn:1.47%; p:0.008 percent; s: 0.001 percent; al: 0.039%; ni:0.36 percent; cr + Mo: 0.32 percent; nb:0.037%; the balance of Fe and inevitable impurities;
preparing smelting raw materials according to the chemical composition of the steel plate, sequentially performing KR molten iron pretreatment, BOF converter smelting, LF external refining, RH vacuum refining, 450mm continuous casting, continuous casting billet covering slow cooling, continuous casting billet compounding, composite billet slow cooling, blank charging and heating, blank high-temperature heat preservation treatment, blank discharging, slab high-pressure water descaling and cooling control, rough rolling, finish rolling, steel plate cooling control and steel plate heat treatment,
covering and slowly cooling the high-temperature plate blank out of the continuous casting machine, wherein the covering inlet temperature is not lower than 900 ℃, the slow cooling time is not lower than 96H, the covering outlet temperature is 150-250 ℃, the slow cooling step aims at reducing the H content in steel,
the continuous casting plate blanks after being taken out of the cover are compounded by a vacuum electron beam welding mode to form composite plate blanks with the thickness of 880mm,
the specific process of the heating, controlled rolling and cooling stages for rolling the composite blank into the steel plate comprises the following steps: heating the blank to 1180-1280 ℃, preserving heat for 10 hours, removing scale by high-pressure water after discharging, and controlling cooling to 1100 +/-20 ℃ within 20 seconds; then rolling in two stages, wherein the finish rolling initial rolling temperature is 971 ℃, and the initial rolling thickness is 284.5mm; the steel plate after rolling is controlled to be cooled to 660 ℃ below the line,
and (3) putting the completely cooled steel plate into a trolley furnace for normalizing heat treatment, heating at 900 +/-10 ℃, keeping the furnace for 450min, and cooling in static air after the time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110300900.8A CN113249642B (en) | 2021-03-22 | 2021-03-22 | Large-thickness SA299GrB steel plate for steam drum end socket and manufacturing method thereof |
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| CN102851473A (en) * | 2012-08-28 | 2013-01-02 | 舞阳钢铁有限责任公司 | Method for producing heavy-gauge SA299 steel plates for boiler drums in power plants |
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| CN106834946A (en) * | 2017-02-27 | 2017-06-13 | 江阴兴澄特种钢铁有限公司 | Big thickness protects Testing Tensile Strength at Elevated Temperature steel plate SA299GrB and preparation method thereof |
| CN109207855A (en) * | 2018-10-16 | 2019-01-15 | 五矿营口中板有限责任公司 | Microstructure uniform shock has the special heavy plate and its manufacturing method of excellent toughness |
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| CN111926234A (en) * | 2020-08-12 | 2020-11-13 | 宝武集团鄂城钢铁有限公司 | Production method for producing super-thick high-strength steel plate for building with excellent thickness directivity based on continuous casting billet single frame |
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| CN102851473A (en) * | 2012-08-28 | 2013-01-02 | 舞阳钢铁有限责任公司 | Method for producing heavy-gauge SA299 steel plates for boiler drums in power plants |
| CN104962814A (en) * | 2015-06-14 | 2015-10-07 | 秦皇岛首秦金属材料有限公司 | Normalized extra-thick plate with high strength and toughness and thickness of 150mm and method for manufacturing normalized extra-thick plate |
| CN106834946A (en) * | 2017-02-27 | 2017-06-13 | 江阴兴澄特种钢铁有限公司 | Big thickness protects Testing Tensile Strength at Elevated Temperature steel plate SA299GrB and preparation method thereof |
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| CN109252108A (en) * | 2018-09-28 | 2019-01-22 | 唐山中厚板材有限公司 | A kind of 150mm thickness low compression ratio Z-direction performance steel plate and its production method |
| CN109207855A (en) * | 2018-10-16 | 2019-01-15 | 五矿营口中板有限责任公司 | Microstructure uniform shock has the special heavy plate and its manufacturing method of excellent toughness |
| CN111926234A (en) * | 2020-08-12 | 2020-11-13 | 宝武集团鄂城钢铁有限公司 | Production method for producing super-thick high-strength steel plate for building with excellent thickness directivity based on continuous casting billet single frame |
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