CN115141977B - High-wear-resistance hot rolled strip steel and steel tube for casting blank production pump truck and manufacturing method thereof - Google Patents
High-wear-resistance hot rolled strip steel and steel tube for casting blank production pump truck and manufacturing method thereof Download PDFInfo
- Publication number
- CN115141977B CN115141977B CN202210727796.5A CN202210727796A CN115141977B CN 115141977 B CN115141977 B CN 115141977B CN 202210727796 A CN202210727796 A CN 202210727796A CN 115141977 B CN115141977 B CN 115141977B
- Authority
- CN
- China
- Prior art keywords
- equal
- casting blank
- hot rolled
- temperature
- rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 103
- 239000010959 steel Substances 0.000 title claims abstract description 103
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 61
- 238000005266 casting Methods 0.000 title claims abstract description 49
- 238000003723 Smelting Methods 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 66
- 238000010438 heat treatment Methods 0.000 claims description 35
- 238000000137 annealing Methods 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 30
- 238000010791 quenching Methods 0.000 claims description 22
- 230000000171 quenching effect Effects 0.000 claims description 22
- 238000001816 cooling Methods 0.000 claims description 20
- 238000005496 tempering Methods 0.000 claims description 18
- 238000010583 slow cooling Methods 0.000 claims description 17
- 238000009749 continuous casting Methods 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 8
- 229910000734 martensite Inorganic materials 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 abstract description 6
- 238000013461 design Methods 0.000 description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000011651 chromium Substances 0.000 description 6
- 239000011572 manganese Substances 0.000 description 6
- 238000005275 alloying Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000002356 single layer Substances 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000009785 tube rolling Methods 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- 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
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
-
- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses high-wear-resistance hot rolled strip steel and steel tube for a casting blank production pump truck and a manufacturing method thereof, and belongs to the technical field of steel smelting. The high-wear-resistance hot rolled strip steel for the casting blank production pump truck comprises the following raw materials in percentage by mass: c:1.0-1.2, si:0.20-0.40, mn:0.20-0.35, cr:1.20-1.40, alt:0.010-0.020, P is less than or equal to 0.010, S is less than or equal to 0.002, and C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15 is less than or equal to 1.48. The invention optimizes the element composition and the mass ratio of the hot rolled strip steel, thereby effectively ensuring the hardness and the wear resistance of the strip steel, and ensuring that the strip steel is well matched with the strength and toughness of the welded steel pipe, and further ensuring that the strip steel can effectively meet the requirements of the pipeline for the pump truck with larger specification (5 mm) on the wear resistance and the service life.
Description
Technical Field
The invention belongs to the technical field of steel smelting, and particularly relates to high-wear-resistance hot rolled strip steel and steel tube for a casting blank production pump truck and a manufacturing method thereof.
Background
Along with the vigorous development of society, the skyscraper is visible everywhere in the city, and these modern super high-rise buildings are all cast high building frameworks with concrete, and the concrete adopts the high-pressure pump to carry through the pipeline to pour the height, and the pressure is big in the conveyer pipe, and the inner wall is very easy wearing and tearing.
At present, a single-layer hardening wear-resistant pipe is mainly adopted as a concrete conveying pipe, and the single-layer hardening wear-resistant pipe is short in service life and causes larger waste of resources due to the fact that hardness and toughness are both required. In order to avoid the defects of single-layer wear-resistant steel pipes, bimetallic composite wear-resistant steel pipes are developed at present, the hardness and the toughness of the bimetallic composite wear-resistant steel pipes are divided into two parts, and the bimetallic composite wear-resistant steel pipes consist of an inner pipe and an outer pipe which are independent of each other. The inner pipe has high hardness and good wear resistance, but has lower toughness, and is used for bearing erosion and abrasion of concrete, and the outer pipe has low hardness and good toughness so as to ensure the toughness of the whole conveying pipe. The design of the thin inner pipe has the potential to affect the service life of the pipeline, thereby increasing the cost of concrete delivery. The design of the thick inner tube can cause the support fracture of the conveying framework to cause safety accidents, so that the selection of the proper thickness of the pipeline, namely the proper thickness of the strip steel is particularly important.
At present, a domestic concrete pump truck conveying pipeline is generally produced by adopting 65Mn and NM600 seamless pipes or alloy Cr, ti and Re elements are added on the basis of the production. The production process mainly comprises the steps of steel pipe, cold drawing (compounding), stress relief annealing, blanking, welding, heat treatment, sand blasting and embedding. However, the average wear-resisting life of the steel pipe is only 1.5-3 ten thousand cubic meters due to the poor wear resistance of the steel pipe.
Many steel mills in China are researching the production process of hot rolled plate strip steel, most of the research is focused on stress in plate strip steel production, conventional mechanical properties of the plate strip steel and the like, but less research is conducted on high wear resistance of the hot rolled strip steel and service performance of products made of the strip steel, and the application of the products in the published patent documents in practical engineering is very little.
The publication number is: the application CN111974801a discloses a method for producing hot rolled strip steel, which obtains better mechanical properties through a reasonable hot rolling production process, but the application does not describe the component design concept throughout, and the rolling process mainly describes a heating and cooling process to improve the stress distribution of the narrow strip steel.
The publication number is: the application of CN105239011A discloses a manufacturing method of a wear-resistant seamless steel pipe for a concrete pump truck, which comprises the following steps: (1) steelmaking: desulfurating molten iron, revolving furnace/electric furnace, LF refining furnace, VD vacuum treatment and continuous casting of round billets; (2) tube rolling: heating the tube blank in an annular furnace, heating the tube blank at 1150-1230 ℃, and then performing perforation, tube rolling mill rolling, reducing diameter setting and straightening by a stretch reducer to finish rolling the tube blank; and (3) stress relief annealing of the steel pipe: and (5) annealing treatment is carried out by adopting a continuous furnace. The application adopts the process of 'VD continuous casting billet → hot rolling → stress relief annealing → flaw detection → subsequent treatment', can stably produce the wear-resistant seamless steel tube for concrete pump truck transportation, greatly improves the product yield, reduces the production cost, and the produced seamless steel tube has high hardness and high wear resistance. However, the raw materials used in the application are round billets, and the production difficulty is high.
Disclosure of Invention
1. Problems to be solved
The invention aims to provide high-wear-resistance hot rolled strip steel and steel pipe for pump trucks and a manufacturing method thereof, which meet the requirements of large-specification (5 mm in thickness) hot rolled strip steel welded pipes for pump trucks on mechanical properties such as surface hardness, wear resistance and the like, and provide guiding significance for manufacturing pump truck conveying pipes with long service life.
2. Technical proposal
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the invention relates to high-wear-resistance hot rolled strip steel for a casting blank production pump truck, which comprises the following raw materials in percentage by mass: c:1.0-1.2, si:0.20-0.40, mn:0.20-0.35, cr:1.20-1.40, alt:0.010-0.020, P is less than or equal to 0.010, S is less than or equal to 0.002, and C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15 is less than or equal to 1.48.
The invention optimizes the element composition and the mass ratio of the hot rolled strip steel, namely, through the design of alloying components of high carbon, low manganese and 1.30 percent Cr, and controls C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15 to be less than or equal to 1.48, thereby effectively ensuring the hardness and the wear resistance of the strip steel, and ensuring the toughness of the strip steel after pipe welding to be well matched, and further ensuring that the strip steel can effectively meet the requirements of a large-specification (5 mm) pump truck pipeline on the wear resistance and the service life.
Further preferably, the mass percentage of Cr element in the strip steel is controlled to be 1.30%.
The high-wear-resistance hot rolled steel strip for casting blank production pump vehicles is manufactured by adopting the hot rolled steel strip to be sampled and welded into a pipe, the thickness of the hot rolled steel strip is 5mm, the metallographic structure of the hot rolled steel strip is low-temperature tempered martensite+carbide, the surface hardness is more than or equal to 70HRC, and the pumping speed is more than or equal to Fang Liang and more than or equal to 7 ten thousand cubic meters.
The invention relates to a manufacturing method of high-wear-resistance hot rolled strip steel for casting blank production pump trucks, which comprises the following steps of smelting, continuous casting, casting blank heating, rolling, curling, annealing, welding and postweld heat treatment, wherein the rolling adopts a process of controlling rough rolling, finish rolling and continuous rolling and online cooling control, the rough rolling finishing temperature is more than or equal to 1000 ℃, the finish rolling finishing temperature is 850-895 ℃, and the curling temperature is controlled to 700-850 ℃ through online cooling control.
The invention carries out alloying design on the components of the strip steel, and simultaneously carries out optimization control on the preparation process of the strip steel, in particular adopts a controlled rolling and cooling process to strictly control the finishing rolling temperature and the curling temperature of rough rolling and finish rolling, thereby effectively ensuring the mechanical property of the strip steel with large specification (the thickness is 5 mm), leading the strip steel to reach the technical standard requirement and ensuring good hardenability and higher wear resistance after pipe welding.
Further, an on-line roller hearth annealing furnace is adopted for annealing treatment, the annealing temperature is 740-780 ℃, and the annealing time is 13-15 hours; the post-heat treatment of the welded pipe adopts a quenching and tempering process, wherein the quenching temperature is 850-870 ℃, the heat preservation time is 20-30min, the quenching medium is 40-50 ℃ mechanical oil, the tempering temperature is 135-145 ℃ and the heat preservation time is 120min.
The combination of controlled rolling and cooling, on-line annealing and subsequent quenching and low-temperature tempering heat treatment is beneficial to further ensuring the service performance of the obtained welded pipe. Wherein the depth of a single-side total decarburized layer of the product after on-line annealing is less than or equal to 0.02mm, the surface hardness is 40-45HRC, the band-shaped carbide is less than or equal to 0.5 level, and the net-shaped carbide is less than or equal to 0.5 level; after the test sample is welded into a steel pipe, after quenching and low-temperature tempering heat treatment, the metallographic structure of the obtained steel pipe is low-temperature tempered martensite and carbide, the surface hardness is more than or equal to 70HRC, and pumping Fang Liang is more than or equal to 7 ten thousand cubic meters.
Furthermore, the heating temperature of the casting blank is 1120-1200 ℃, the tapping temperature is more than or equal to 1100 ℃, and the total time of the blank in the furnace is 234-286min.
Further, the final rolling temperature of rough rolling is 1000-1020 ℃, and the tapping temperature of casting blank heating is 1100-1155 ℃.
Further, after the blank is discharged from the furnace, descaling for 1 time under 17MPa, and then rough rolling is started; after finishing rough rolling, descaling for 1 time under 12MPa, then entering into 10 stand continuous rolling units for finish rolling, and after finishing finish rolling, descaling for 1 time under 7MPa, and opening an online air cooling unit for controlled cooling.
Further, after continuous casting, stacking and slow cooling the casting blanks, wherein the slow cooling temperature is controlled to be more than or equal to 700 ℃, the slow cooling time is 48 hours, and meanwhile, the temperature of the casting blanks discharged from a slow cooling pit is ensured to be 300-350 ℃.
3. Advantageous effects
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) The invention optimizes the element composition and the proportion of the strip steel through alloying design, thereby meeting the requirements of the pipeline for pump truck for producing large-specification (5 mm thickness) casting blank on the service performance, especially the hardness, the wear resistance and the service life, and further effectively overcoming the technical difficulties that the hot rolled strip steel with the thickness of 5mm is difficult to reach high wear resistance, single-side total low decarburized layer, low net band carbide and high service life under the service requirement of welding into a pipe.
(2) The invention optimally designs the steel pipe production process based on the design of alloying components, and the mechanical property and the service life of the obtained steel pipe can be further ensured by the process combination of rolling control and cooling control, on-line annealing, quenching and low-temperature tempering postweld heat treatment, and the production process is simple, rapid and convenient to deliver and has low cost. The production process has been tried in a steel mill at home by adopting a production line of 2-roll roughing mill and 10-stand continuous rolling reversible rolling mill, and the performance of the obtained steel pipe can meet the requirements of a pump truck pipeline with the thickness of 5mm through verification, and has the advantages of high wear resistance, high hardenability and long service life.
Drawings
FIG. 1 shows the metallographic structure of a steel pipe obtained by post-weld heat treatment in example 4.
Detailed Description
Considering that the urban construction needs high-quality concrete pump trucks, high-wear-resistance hot rolled strip steel is taken as a raw material, in order to prolong the service life of the high-pressure high-delivery pump truck, the conventional low-power inclusion is well controlled, and the high-wear-resistance concrete pump truck is also required to have excellent high-wear-resistance performance, and is easy to produce and low in cost. Therefore, the inventor of the present invention has conducted a great deal of research on the chemical composition design and production process of the high wear resistance hot rolled steel strip for pump truck in the production of casting blanks, thereby obtaining the proposal of the present application.
Although publication No.: the application of CN113913705A discloses a wear-resistant steel pipe for a concrete pump truck and a preparation method thereof, which adopt continuous casting blanks to produce (2.7-3.7) 285mm narrow strip steel through reasonable smelting component design, and improve a hot rolling process, an annealing process and a quenching and tempering process, so that better hardness performance and pumping capacity conditions can be obtained, but the maximum size of the prepared steel pipe is only 3.7mm, the steel pipe cannot be well suitable for the production of steel pipes with larger specifications, and the surface hardness and pumping capacity of the steel pipe have great difference.
The invention relates to a manufacturing method of high-wear-resistance hot rolled strip steel for a large-thickness casting blank production pump truck, which mainly comprises the following steps: molten iron desulfurization pretreatment, electric furnace smelting, LF+VD refining, continuous casting, casting blank stacking slow cooling, casting blank inspection, casting blank judgment, casting blank acceptance, casting blank heating, descaling, 2 rough rolling, 10 stand-by continuous rolling, online cooling control, crimping, inspection, online annealing heat treatment, cutting, sampling, inspection, pipe welding, quenching+tempering, detection, listing identification and warehousing. Wherein:
(1) And (3) steelmaking component design: the chemical components of the paint comprise, by weight, C:1.0-1.2, si:0.20-0.40, mn:0.20-0.35, P is less than or equal to 0.010, S is less than or equal to 0.002, cr:1.20-1.40, alt:0.010-0.020, pb: not more than 0.002, cu, ni, mo and the like are residual elements, which are not intentionally added, C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15 not more than 1.48, and the balance of Fe and unavoidable impurities.
(2) And (3) blank slow cooling process: because the composition design is high-carbon and high-chromium and the carbon equivalent is high, the blank must be put into a slow cooling pit for slow cooling. The slow cooling temperature is controlled to be more than or equal to 700 ℃, the slow cooling time is 48 hours, and meanwhile, the temperature of a slow cooling pit is ensured to be higher than or equal to 700 ℃:300-350 ℃.
(3) The heating and rolling process comprises the following steps: blank heating temperature: 1120-1200 ℃, the tapping temperature is equal to or higher than 1100 ℃, and rectangular casting blanks with the thickness of 150mm multiplied by 260mm are adopted: rolling into 5mm 225mm strip steel, wherein the total time of a blank is 234-286min, after the blank is discharged from the furnace, the blank is subjected to descaling under 17MPa for 1 time, rough rolling is started, the finishing temperature of rough rolling is more than or equal to 1000 ℃, after rough rolling is finished, the blank is subjected to descaling under 12MPa for 1 time, then the blank is rapidly fed into 10 flat continuous rolling mills for finish rolling, and is subjected to descaling under 7MPa for 1 time before finishing rolling, so that no oxidized iron sheet is pressed in the surface, and the finishing temperature of finish rolling is ensured: 850-900 ℃. After finishing finish rolling, a plurality of groups of online air cooling machines are opened for cooling control (preferably 3 groups) so as to ensure the curling temperature: 700-850 ℃.
Because the high wear-resistant hot rolled strip steel needs to have excellent wear resistance, the production method adopts finish rolling continuous rolling besides high carbon and high chromium in component design, and adopts air cooling as a cooling control means, thereby solving the problem of strip steel curling temperature control production method.
(4) The heat treatment process comprises the following steps: in order to control the size of hot rolled net band carbide, the rolled net band carbide enters an online roller bottom type annealing furnace after being curled, and the annealing temperature is as follows: 740-780 ℃, annealing time: 13-15 hours, preferably 15 hours; and sampling and detecting the size and the surface hardness of the banded carbide. Meanwhile, in order to facilitate subsequent processing and detection, after sampling, the sample is welded into a steel pipe, and quenching and tempering heat treatment is carried out on the steel pipe. Quenching temperature: the temperature is kept between 850 and 870 ℃ for a period of time: 20-30min, preferably 30min; quenching medium: mechanical oil at 50 ℃; tempering temperature: preserving heat for 120min at 135-145 ℃.
The depth of the unilateral total decarburized layer of the product after on-line annealing is less than or equal to 0.02mm, the surface hardness is 40-45HRC, the band-shaped carbide is less than or equal to 0.5 level, and the net-shaped carbide is less than or equal to 0.5 level. After the test sample is welded into a steel pipe, after quenching and low-temperature tempering heat treatment, the metallographic structure is low-temperature tempered martensite and carbide, the surface hardness is more than or equal to 70HRC, the pumping Fang Liang is more than or equal to 7 ten thousand cubic meters, and the steel pipe has good hardenability and high wear resistance.
The invention is further described below in connection with specific embodiments.
Examples 1 to 5
The manufacturing method of the high-wear-resistance hot rolled steel strip for the pump truck for producing the casting blank with the large thickness in the embodiments 1-5 mainly comprises the processes of smelting, LF+VD refining, continuous casting, casting blank stacking slow cooling, casting blank heating, descaling, 2 rough rolling, 10 stand-by continuous rolling, on-line cooling control, curling, on-line annealing heat treatment, sampling, welding pipe, quenching and tempering, wherein:
(1) The chemical compositions of the high wear resistance hot rolled steel strips for casting production pump vehicles are shown in the following table 1 respectively. Wherein, C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15 in examples 1-5 are 1.32, 1.43, 1.48, 1.39 and 1.48, respectively.
TABLE 1 chemical Components (wt%) in examples 1-5
| C | Si | Mn | P | S | Ni | Cr | Mo | ALt | Cu | |
| Example 1 | 1.0 | 0.25 | 0.30 | 0.008 | 0.001 | 0.03 | 1.38 | 0.02 | 0.01 | 0.06 |
| Example 2 | 1.15 | 0.20 | 0.25 | 0.008 | 0.002 | 0.05 | 1.2 | 0.03 | 0.015 | 0.05 |
| Example 3 | 1.2 | 0.38 | 0.20 | 0.010 | 0.001 | 0.03 | 1.22 | 0.05 | 0.02 | 0.05 |
| Example 4 | 1.05 | 0.40 | 0.35 | 0.008 | 0.001 | 0.03 | 1.4 | 0.03 | 0.013 | 0.04 |
| Example 5 | 1.18 | 0.25 | 0.28 | 0.008 | 0.001 | 0.05 | 1.25 | 0.05 | 0.018 | 0.05 |
(2) Casting blank heating process
The casting billet heating process parameters in examples 1 to 5 are shown in the following Table 2, respectively.
TABLE 2 casting blank heating process parameters
The experimental steel has the characteristic of high wear resistance, the size of a rectangular casting blank is 150 x 260, in order to reduce the size of banded carbide in the core of the casting blank, a rolling mode of controlling rough rolling, finish rolling and air cooling is adopted for controlling the rolling temperature of a steel plate, the grain growth speed in a high-temperature state is reduced, the discharging temperature of the casting blank selected by the production method is high Wen Chulu, namely the temperature is more than or equal to 1100 ℃, and the alloy is controlled by heating coefficient of 0.9-1.1min/mm according to the maximum thickness of the casting blank in furnace time because of chromium and a small amount of manganese, so that the temperature of the casting blank is ensured to be uniform, the capability of rolling and penetrating into the core is increased, the core deformability is improved, and the grain size of the core structure is reduced.
(3) Controlled rolling process
The rolling process parameters in examples 1-5 are shown in Table 3 below, respectively.
TABLE 3 Rolling Process parameters
(4) On-line annealing process
The in-line annealing process parameters in examples 1-5 are shown in table 4 below, respectively.
Table 4 in-line annealing process parameters
The performance parameters of the strip after in-line annealing are shown in table 5 below.
TABLE 5 Performance parameters after in-line annealing
(5) After the test pieces were welded into steel pipes of 5mm (pipe thickness) 225mm (pipe height), the test pieces were subjected to quenching and tempering heat treatment, and the quenching and tempering process parameters of examples 1 to 5 are shown in tables 6 and 7, respectively.
Table 6 quenching process parameters
TABLE 7 tempering process parameters
The performance parameters of the test pieces after the tube was welded and quenched and tempered are shown in Table 8 below. As can be seen from the table, the invention has the advantages that through the design of alloying components, and through the controlled rolling and controlled cooling, the on-line annealing and the subsequent quenching and low-temperature tempering heat treatment, the metallographic structure of the obtained steel pipe is low-temperature tempered martensite and carbide (the metallographic structure after the postweld heat treatment in the example 4 is shown in the figure 1), the surface hardness is more than or equal to 70HRC, the pumping Fang Liang is more than or equal to 7 ten thousand cubic meters, the quenching degree is good, the wear resistance is high, and the mesh belt carbide grade, the surface hardness and the pumping capacity index of the obtained steel pipe all meet the technical standard requirements. Because the high-wear-resistance hot rolled strip steel is influenced by the development of the smelting quality of rectangular casting blanks, the requirements of the consistent performance of the mesh-belt carbide on the size, the high hardness and the high wear resistance are met, in the actual industrial mass production process, the defects of coarse original grain size and even mixed crystal phenomenon are easily caused to avoid the occurrence of heating cracking in the production process, so that the surface hardness performance is seriously influenced, the slow cooling process, the curling temperature control process and the online annealing process of blanks are subjected to fuzzing optimization after a sample is welded, and the requirements are stipulated, so that the high-wear-resistance pump truck strip steel can be produced by adopting lower production equipment conditions in industrial mass production.
TABLE 8 Performance parameters after quenching and tempering
Claims (9)
1. The manufacturing method of the high-wear-resistance hot-rolled steel strip pipe for the casting blank production pump truck is characterized in that the raw materials of the high-wear-resistance hot-rolled steel strip pipe for the casting blank production pump truck comprise the following components in percentage by mass: c:1.0-1.2, si:0.20-0.40, mn:0.20-0.35, cr:1.20 to 1.40, alt:0.010 to 0.020, P is less than or equal to 0.010, S is less than or equal to 0.002, and C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15 is less than or equal to 1.48; the manufacturing method comprises smelting, continuous casting, casting blank heating, rolling, curling, annealing, welding and postweld heat treatment, wherein the rolling adopts a process of controlling rough rolling, finish rolling, continuous rolling and online cooling control, the final rolling temperature of rough rolling is more than or equal to 1000 ℃, the final rolling temperature of finish rolling is 850-895 ℃, and the curling temperature is 700-850 ℃ through online cooling control.
2. The method for manufacturing a high wear resistance hot rolled steel strip pipe for a casting blank production pump truck according to claim 1, characterized by: the depth of the unilateral total decarburized layer of the strip steel is less than or equal to 0.02mm, the surface hardness is 40-45HRC, the band-shaped carbide is less than or equal to 0.5 level, and the net-shaped carbide is less than or equal to 0.5 level.
3. The method for manufacturing a high wear resistance hot rolled steel strip pipe for a casting blank production pump truck according to claim 1 or 2, characterized by: the mass percentage of Cr element contained in the strip steel is 1.30%.
4. The method for manufacturing a high wear resistance hot rolled steel strip pipe for a casting blank production pump truck according to claim 1 or 2, characterized by: annealing treatment is carried out by adopting an online roller hearth annealing furnace, wherein the annealing temperature is 740-780 ℃, and the annealing time is 13-15 hours; the postweld heat treatment adopts a quenching and tempering process, wherein the quenching temperature is 850-870 ℃, the heat preservation time is 20-30min, the quenching medium is 40-50 ℃ mechanical oil, the tempering temperature is 135-145 ℃ and the heat preservation time is 120min.
5. The method for manufacturing a high wear resistance hot rolled steel strip pipe for a casting blank production pump truck according to claim 4, characterized by: the heating temperature of the casting blank is 1120-1200 ℃, the tapping temperature is more than or equal to 1100 ℃, and the total time of the blank in the furnace is 234-286min.
6. The method for manufacturing a high wear resistance hot rolled steel strip pipe for a casting blank production pump truck according to claim 5, characterized by: the final rolling temperature of rough rolling is 1000-1020 ℃, and the tapping temperature of casting blank heating is 1100-1155 ℃.
7. The method for manufacturing a high wear resistance hot rolled steel strip pipe for a casting blank production pump truck according to claim 5, characterized by: after the blank is discharged from the furnace, descaling for 1 time under 17MPa, and then rough rolling; after finishing rough rolling, descaling for 1 time under 12MPa, then entering into 10 stand continuous rolling units for finish rolling, and after finishing finish rolling, descaling for 1 time under 7MPa, and opening an online air cooling unit for controlled cooling.
8. The method for manufacturing a high wear resistance hot rolled steel strip pipe for a casting blank production pump truck according to claim 7, characterized by: after continuous casting, stacking and slow cooling the casting blank, wherein the slow cooling temperature is controlled to be more than or equal to 700 ℃, the slow cooling time is 48 hours, and meanwhile, the temperature of a slow cooling pit is ensured to be 300-350 ℃.
9. The utility model provides a casting blank production pump truck is with high wearability hot rolled steel strip pipe which characterized in that: the steel pipe is manufactured by the method of any one of claims 1-8, the thickness of the hot rolled steel strip pipe is 5mm, the metallographic structure of the hot rolled steel strip pipe is low-temperature tempered martensite+carbide, the surface hardness is more than or equal to 70HRC, and the pumping speed is more than or equal to Fang Liang and is more than or equal to 7 ten thousand cubic meters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210727796.5A CN115141977B (en) | 2022-06-24 | 2022-06-24 | High-wear-resistance hot rolled strip steel and steel tube for casting blank production pump truck and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210727796.5A CN115141977B (en) | 2022-06-24 | 2022-06-24 | High-wear-resistance hot rolled strip steel and steel tube for casting blank production pump truck and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115141977A CN115141977A (en) | 2022-10-04 |
| CN115141977B true CN115141977B (en) | 2023-05-05 |
Family
ID=83407306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210727796.5A Active CN115141977B (en) | 2022-06-24 | 2022-06-24 | High-wear-resistance hot rolled strip steel and steel tube for casting blank production pump truck and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115141977B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004190127A (en) * | 2002-11-28 | 2004-07-08 | Jfe Steel Kk | Wire rod and steel bar for bearing having spherodized carbide structure, and manufacturing method therefor |
| JP5030695B2 (en) * | 2007-07-19 | 2012-09-19 | 住友金属工業株式会社 | High carbon steel excellent in break separation and production method thereof |
| CN101186960B (en) * | 2007-12-05 | 2010-07-28 | 南京钢铁股份有限公司 | Method for producing wear-resisting hot-rolling steel plate by using furnace rolling machine and steel plate prepared by the same method |
| EP3447156B1 (en) * | 2016-04-19 | 2019-11-06 | JFE Steel Corporation | Abrasion-resistant steel sheet and method for producing abrasion-resistant steel sheet |
| CN105925909B (en) * | 2016-06-24 | 2017-11-14 | 邢台钢铁有限责任公司 | A kind of bearing steel wire rod and its production method |
| CN111349859B (en) * | 2020-05-09 | 2021-07-30 | 安徽工业大学 | Large-thickness 500 MPa-level high-Z-direction laminar-performance low-temperature container steel plate rolled by composite blank and manufacturing method thereof |
| CN113774275A (en) * | 2021-08-05 | 2021-12-10 | 莱芜钢铁集团银山型钢有限公司 | Easily-formed high-wear-resistance steel plate for silt conveying pipeline and preparation method thereof |
| CN113913705A (en) * | 2021-09-18 | 2022-01-11 | 南京钢铁股份有限公司 | Wear-resistant steel pipe for concrete pump truck and preparation method thereof |
-
2022
- 2022-06-24 CN CN202210727796.5A patent/CN115141977B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN115141977A (en) | 2022-10-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110438414B (en) | Method for eliminating surface cracks of ultra-wide ferritic stainless steel medium plate | |
| CN112981235B (en) | Hardened and tempered steel plate with yield strength of 420MPa grade for building structure and production method thereof | |
| CN110184525B (en) | High-strength Q500GJE quenched and tempered steel plate for building structure and manufacturing method thereof | |
| CN101928876B (en) | TRIP/TWIP high-strength plastic automobile steel with excellent processability and preparation method thereof | |
| CN112226699A (en) | Production method of acid-resistant pipeline steel | |
| CN110453148A (en) | Ultra-wide economical double-phase stainless steel medium plate and manufacturing method thereof | |
| US20240253099A1 (en) | Method for rolling high-toughness high-strength low-alloy steel | |
| CN105624382A (en) | Hot-rolling method for V-Ti microalloyed steel | |
| CN111349859B (en) | Large-thickness 500 MPa-level high-Z-direction laminar-performance low-temperature container steel plate rolled by composite blank and manufacturing method thereof | |
| CN114015847A (en) | Method for producing 45 steel for direct cutting by controlled rolling and controlled cooling process | |
| CN114411061A (en) | High-strength anti-seismic steel bar and preparation method thereof | |
| CN104018063B (en) | The production method of low-alloy high-strength Q420C medium plates | |
| CN109913749A (en) | Economical wear-resistant seamless steel tube and manufacturing method thereof | |
| CN113084132A (en) | Production method for reducing surface defects of ferritic stainless steel plate | |
| CN115141977B (en) | High-wear-resistance hot rolled strip steel and steel tube for casting blank production pump truck and manufacturing method thereof | |
| CN111534744A (en) | Steel for die casting wear-resistant chain plate and manufacturing method thereof | |
| CN106513439A (en) | Manufacturing method for hot-rolled high-carbon steel sheet strip with single-face decarburized layer ratio smaller than 0.7% | |
| CN110964971A (en) | Production method of X65M-grade pipeline steel plate with thin specification and high crack resistance | |
| CN110747408A (en) | Thin-specification ASNZS 3678-350L15 structural steel plate and manufacturing method thereof | |
| CN112522594A (en) | Thin-specification fire-resistant weather-resistant steel plate/belt and production method thereof | |
| CN116083806A (en) | Cold heading steel hot rolled wire rod for delayed fracture resistant 14.9-grade quenched and tempered bolt and preparation method thereof | |
| CN111235479B (en) | Manufacturing method of economical pipeline steel | |
| CN110527903B (en) | Roller for galvanized aluminum plate and preparation method thereof | |
| CN111118276A (en) | Heat treatment process for ultra-deep quench-hardened cold roll | |
| CN116103579B (en) | Wear-resistant ERW welded steel pipe for concrete pump truck and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |