CN116103579A - Wear-resistant ERW welded steel pipe for concrete pump truck and manufacturing method thereof - Google Patents
Wear-resistant ERW welded steel pipe for concrete pump truck and manufacturing method thereof Download PDFInfo
- Publication number
- CN116103579A CN116103579A CN202310169797.7A CN202310169797A CN116103579A CN 116103579 A CN116103579 A CN 116103579A CN 202310169797 A CN202310169797 A CN 202310169797A CN 116103579 A CN116103579 A CN 116103579A
- Authority
- CN
- China
- Prior art keywords
- steel pipe
- wear
- resistant
- concrete pump
- pump truck
- 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.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 98
- 239000010959 steel Substances 0.000 title claims abstract description 98
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000010791 quenching Methods 0.000 claims abstract description 19
- 230000000171 quenching effect Effects 0.000 claims abstract description 18
- 239000012535 impurity Substances 0.000 claims abstract description 11
- 230000006698 induction Effects 0.000 claims abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 4
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 38
- 238000003466 welding Methods 0.000 claims description 37
- 238000005096 rolling process Methods 0.000 claims description 31
- 238000005266 casting Methods 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- 238000005496 tempering Methods 0.000 claims description 13
- 238000009628 steelmaking Methods 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 238000009749 continuous casting Methods 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 39
- 230000000694 effects Effects 0.000 description 10
- 229910000734 martensite Inorganic materials 0.000 description 9
- 238000005728 strengthening Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 238000001556 precipitation Methods 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910000859 α-Fe Inorganic materials 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 4
- 229910001562 pearlite Inorganic materials 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 229910000510 noble metal Inorganic materials 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910006639 Si—Mn Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 150000003568 thioethers Chemical class 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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
- 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
- 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
-
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- 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
- Y02P10/25—Process efficiency
Abstract
The invention provides a wear-resistant ERW welded steel pipe for a concrete pump truck and a manufacturing method thereof, wherein the components are as follows: c:0.30% -0.40%, si:0.15% -0.30%, mn:1.00% -1.80%, P is less than or equal to 0.015%, S is less than or equal to 0.0080%, cr:0.10% -0.30%, als:0.020% -0.050%, nb:0.020% -0.050%, V:0.030% -0.050%, N: less than or equal to 0.0080 percent, H: less than or equal to 0.0003 percent; the balance of Fe and unavoidable impurities; the Ceq0.54-0.70 and the Pcm0.36-0.46 of the steel have good weldability and lower crack sensitivity, and the steel pipe is subjected to induction quenching treatment to obtain a hardening structure to improve the hardness of the inner wall so as to obtain good wear resistance, thereby meeting the requirement of a concrete pump truck on the long distance or high conveying capacity of the wear-resistant pipe.
Description
Technical Field
The invention belongs to the field of metal materials, and particularly relates to a wear-resistant ERW welded steel pipe for a concrete pump truck and a manufacturing method thereof, which are mainly applied to manufacturing of a concrete wear-resistant conveying steel pipe for the concrete pump truck.
Background
With the stable development of the global engineering machinery industry, the requirements of various industries such as engineering machinery, construction and the like on steel materials are increasingly greater, and the requirements on the comprehensive properties of the materials are also increasingly higher. Wherein the demand of the conveying pipe in the concrete pump truck is hundreds of thousands of tons. The wear resistance of the concrete conveying pipe as a pipeline in flowing contact with concrete is related to the service life of the concrete conveying pipe.
At present, a concrete pump truck conveying pipeline is generally produced by adopting seamless pipes made of materials such as 20#, 45Mn, 55Mn, 65MnCr and the like, the conveying capacity of a common concrete conveying pipe is about 1.5-2 ten thousand cubic meters, the service life of the conveying pipe made of the high-wear-resistant 65MnCr material is prolonged by about 2-4 times, and the service life is about 3 ten thousand cubic meters.
The wear resistance of the material mainly depends on the hardness of the material, obviously, the wear resistance of the material is improved along with the increase of the carbon content in steel, the content of proeutectoid ferrite in a structure is reduced, and the hardenability is also improved. However, as the carbon content in steel increases, the strength of the material increases, the elongation decreases, the cold formability decreases significantly, and the weldability decreases significantly. Therefore, from the point of matching the components and the heat treatment process, the wear-resistant pipe material with better welding performance and equivalent or higher hardness of the finished wear-resistant pipe and the production method thereof are researched, and the method has important economic and social benefits for improving the processing performance of the steel pipe, ensuring the welding quality, prolonging the service life, saving energy and reducing consumption.
The invention of publication No. CN101602079A published in 12 months and 16 days in 2009 discloses a method for manufacturing a wear-resistant steel pipe by adopting a hot rolled coil, wherein the hot rolled coil comprises the chemical components of 0.10-0.22% of C, 0.15-0.70% of Si, 0.70-1.40% of Mn, 0.01-0.40% of Ni, 0.05-0.40% of Cr, 0.10-0.60% of Mo, 0-0.35% of Cu, 0-0.050% of Nb, 0-0.050% of V, 0-0.030% of Ti, 0.010-0.075% of Al, 0.0005-0.0040% of B, 0-0.0005% of Zr, less than or equal to 0.020% of P, less than or equal to 0.010% of S, less than or equal to 0.0080% of N, and the balance of Fe, and finally the wear-resistant steel pipe with good wear resistance is obtained through the procedures of slitting, ERW welding, heat treatment and the like. The wear-resistant tube with different hardness of HBW360-HBW450 (about HRC39-HRC 47) can be finally obtained through the matching adjustment of components and processes, but 0.15-0.35% Mo is required to be added while the higher hardness of the HBW450 is obtained, so that the material cost is obviously increased.
The invention of publication No. CN102747290A published in 10 month and 24 year 2012 discloses an economic abrasion-resistant steel pipe and a manufacturing method thereof, wherein the economic abrasion-resistant steel pipe comprises 0.42-0.60% of C, 0.10-0.40% of Si, 0.60-1.40% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.20-0.80% of Cr, 0.010-0.080% of Al, 0.005-0.040% of Ti, 0.0010-0.0050% of Ca, less than or equal to 0.0015% of B, 0.0030-0.0100% of N and the balance of Fe and unavoidable impurities, and the steel plate coil is subjected to the procedures of parting, ERW welding, quenching, tempering and the like to obtain the abrasion-resistant welded pipe with high hardness and high abrasion resistance, and is suitable for equipment which is easy to abrade in engineering machinery, such as concrete pump truck conveying pipes. The wear-resistant tube with different hardness of HBW360-HBW450 (about HRC39-HRC 47) can be finally obtained through the matching adjustment of components and processes, but 0.15-0.35% Mo is required to be added while the higher hardness of the HBW450 is obtained, so that the material cost is obviously increased. Ceq=0.56-0.99, pcm=0.46-0.72, and the welding difficulty of the material is high and the crack sensitivity is high, in addition, due to the fact that the carbon content is high, the segregation of carbon is heavy, carbide on a material matrix is uneven, so that the welding property of a pipe is poor, the steel pipe is easy to crack in the subsequent quenching process, and the wear resistance is unstable in the later use process due to the fact that the brittleness is high.
The patent CN111020370A of 17-month-4 in 2020 discloses a single-layer wear-resistant seamless steel pipe for a concrete pump truck and a manufacturing method thereof, wherein the single-layer wear-resistant seamless steel pipe comprises 0.50-0.60% of C, 0.15-0.35% of Si, 0.60-0.90 Mn, 0.25-0.50 Cr, 0.010-0.030% of Ti, the balance of Fe and unavoidable impurities, and the seamless wear-resistant pipe blank with hardness reaching HRC55-HRC62 on a hardening layer is obtained by normalizing and quenching the rolled steel pipe in sequence, the mortar conveying amount reaches 4 ten thousand cubes, and a better effect is obtained. However, the seamless tube blank perforated at high temperature has low dimensional accuracy and large wall thickness difference, and the tube blank is subjected to quenching treatment after normalizing treatment at 800-830 ℃ in the working procedure, so that the production efficiency is reduced, and the production cost is increased; in addition, ceq=0.65-0.85, pcm=0.55-0.68, the welding difficulty of the material is high, the crack sensitivity is high, in addition, due to the fact that the carbon content is high, the segregation of carbon is heavy, carbide on a material matrix is uneven, the welding property of a pipe is poor, the pipe is easy to crack during subsequent quenching, and the abrasion resistance is unstable in the later use process due to the fact that the brittleness is high.
Disclosure of Invention
The invention aims to provide a wear-resistant ERW welded steel pipe for a concrete pump truck and a manufacturing method thereof, wherein the wear-resistant ERW welded steel pipe for the concrete pump truck is obtained through comprehensive design of components and a heat treatment process, the components are designed by adopting C-Si-Mn+Nb-V-Cr components, and noble metals with higher cost such as Mo, rare earth elements and the like are not added, so that the material alloy cost is effectively reduced, and the economy is good; and the produced steel has better welding performance and better crack resistance sensitivity.
The specific technical scheme of the invention is as follows:
the wear-resistant ERW welded steel pipe for the concrete pump truck comprises the following components in percentage by mass:
c:0.30% -0.40%, si:0.15% -0.30%, mn:1.00% -1.80%, P is less than or equal to 0.015%, S is less than or equal to 0.0080%, cr:0.10% -0.30%, als:0.020% -0.050%, nb:0.020% -0.050%, V:0.030% -0.050%, N: less than or equal to 0.0080 percent, H: less than or equal to 0.0003 percent; the balance being Fe and unavoidable impurities.
The components of the wear-resistant ERW welded steel pipe for the concrete pump truck also meet the following conditions:
a value=37×c+5×cr+8×si+5×mn+10×nb, and an a value of 20 or less is 26 or less; the A value formula mainly contains material strengthening elements, and mainly ensures the strength of the material, the ideal hardness of the quenched material and the wear resistance of the tube blank.
The components of the wear-resistant ERW welded steel pipe for the concrete pump truck also meet the following conditions:
d value=53×Nb+10×Mn-53×N-12×S-11×Als, D value 11.ltoreq.D value 16; the D value formula is intended to take into account inclusion control.
The components of the wear-resistant ERW welded steel pipe for the concrete pump truck also meet the following conditions: ceq:0.54 to 0.70;
Ceq＝C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15；
the components of the wear-resistant ERW welded steel pipe for the concrete pump truck also meet the following conditions: pcm is 0.36-0.46;
Pcm＝C+Si/30+(Cr+Mn+Cu)/20+Ni/60+Mo/15+V/10。
in the above calculation formula, the index value of each element=the content of the element in steel×100.
The invention provides a manufacturing method of a wear-resistant ERW welded steel pipe for a concrete pump truck, which comprises the following process flows:
molten iron pretreatment, steelmaking, alloy fine adjustment station, LF, RH, continuous casting, casting blank hot charging, hot continuous rolling, laminar cooling, coiling, slitting, ERW pipe welding, quenching, tempering and finished product.
The steelmaking is suitable for smelting in a converter, an electric furnace or an induction furnace;
the continuous casting is carried out, casting blanks are produced, a stable speed casting method and a uniform cooling process with the fluctuation of the molten steel surface of a crystallizer within +/-5 mm are adopted, dynamic soft reduction is put into use, and electromagnetic rollers are used for stirring to enable impurities to float upwards so as to obtain good internal quality of the casting blanks;
in order to further ensure the quality of the casting blank, reduce the cracks of the casting blank, save energy consumption at the same time, and adopt a casting blank hot-charging mode for assembly; the heating temperature of the casting blank is 1180-1230 ℃, and the heat preservation is carried out for 2-3 hours, so that the rolling deformation resistance is effectively reduced, and the thicknesses of decarburized layers and oxide layers on the surfaces of the casting blank and the steel plate are reduced;
the hot continuous rolling and rough rolling are carried out for 3+3 times, descaling water is fully started, rough rolling is carried out until the thickness of the intermediate blank is 30-50mm, and the rough rolling reduction is not lower than 75%; 7 passes of finish rolling were performed on a 2250mm hot continuous rolling mill with a finish rolling inlet temperature of 960-1060 ℃. In order to ensure the surface quality of the hot rolled product, the product needs to be changed in rollers before finish rolling, the product needs to be rolled in the first 1/2 period (namely 45 Km) of one rolling period, the final rolling temperature is controlled between 840 and 900 ℃, and the product is rolled to strip steel with the thickness of 2.5 to 6.0mm and the width of 1000 to 1500 mm;
the laminar cooling is carried out, the finished strip steel is subjected to front-stage intensive laminar cooling, the cooling speed is controlled to be 15-35 ℃/s, coiling is carried out within the range of 640-680 ℃, and air cooling is carried out to room temperature;
the cooled structure after hot rolling and coiling is a ferrite and pearlite structure, wherein the area proportion of pearlite is 55% -70%, the grain size is more than or equal to 11 levels, the band-shaped structure is less than or equal to 2.5 levels, the tensile strength is 680-750MPa, the yield strength is 450-500MPa, and the elongation is more than or equal to 26%; the requirement of the material on the capacity of welding production line equipment is reduced, the quality of the welding seam is convenient to control, and the occurrence of the defects of cold joint or unfused joint caused by large deformation resistance after welding is avoided.
After coiling, the steel coil is split and ERW welded.
The ERW steel pipe has an opening angle controlled to be 3-9 degrees and an extrusion amount controlled to be 1-3mm in the welding process.
The ERW welded pipe is heated to 930-970 ℃ in induction heating equipment to austenitize for 70-130s, then the steel pipe is quenched, a continuous induction heating furnace is adopted to rapidly heat the steel pipe, water is sprayed on a bench to quench after the steel pipe is discharged from the furnace, the steel pipe with a martensitic structure is obtained, then tempering treatment is carried out on the quenched steel pipe again, the tempering heating temperature is 150-300 ℃, and the tempering time is 100-160min, so that quenched martensite is converted into tempered martensite, (no other structure exists after tempering and the quenched steel pipe is pure tempered martensite). And (3) carrying out inspection such as straightening and flaw detection on the tube blank to obtain the wear-resistant steel tube with the HRC more than or equal to 55 HRC.
The structure of the steel plate after hot rolling is F+P, the material strength is relatively low, and the steel plate is convenient to roll into a steel pipe in the splitting processing and ERW welding processes; the structure of the finished pipe after the ERW welded steel pipe is tempered martensite, and the hardness and strength of the material are high, so that the finished pipe has better wear resistance than a hot rolled state, and the effect of the steel pipe is achieved.
The design idea of the invention is as follows:
c is a gap atom in steel, plays a very important role in the strength (yield and tensile strength) of materials, the welding performance and the hardness (wear resistance) of finished products after quenching, and in order to enable the wear resistance of the final finished products to meet the use requirement, the content of C must be ensured to be more than 0.30%; meanwhile, the C content cannot be too high, on one hand, the welding performance of the material is affected by the too high C content, on the other hand, the plasticity, the welding performance and the like of the material are deteriorated due to the high C content, and the tendency of quenching cracks generated at the welding seam position is increased when the finished product is quenched, so that the C content is reasonably controlled between 0.30 and 0.40 percent.
Si and Cr: silicon is the preferential element and has a high diffusion coefficient. Si and Cr are easy to be associated and enriched on the surface of the steel plate. Surface element enrichment oxidation mainly occurs when 900-1100 f is heated. The Si and Cr enriched on the surface are oxidized first and spread and grown on the interface to form a continuous compact oxide film (SiO 2 And Cr (V) 2 O 3 ) Can isolate oxygen and play an antioxidant role. Meanwhile, cr element can obviously improve the hardenability of the material, so that the finished product has higher strength. The invention considers that Si is easy to cause the surface quality defects of red iron sheet, pits and the like on the surface of the steel plate to influence the apparent quality of the steel plate and the finished product, thus the steel adopts low Si to setAnd the content of Cr is controlled to be 0.10-0.30%, and the calculated content is reasonably controlled to be 0.15-0.30%.
Mn element can improve the strength of steel through solid solution strengthening, can promote the dissolution of a carbonitride precipitation phase during heating, inhibit precipitation of the precipitation phase during rolling, is favorable for keeping more precipitation elements to be precipitated in ferrite during cooling after rolling, strengthens precipitation strengthening, can enlarge an austenite phase region, reduces the transformation temperature of a supercooled austenite phase, is favorable for refining a phase transformation structure, but the Mn content is not too high, mn segregation easily occurs during steelmaking when the Mn content is higher than 1.8%, and edge cracking easily occurs during slab continuous casting; in order to ensure the strength of the steel plate and the quality of the plate blank, the Mn content of the invention should be reasonably controlled to be 1.0-1.8%.
P, S is an impurity element in steel, the lower the content is, the better the content is, but the too low P content can increase the steelmaking cost, so that the P content is controlled below 0.015%, and the requirements of the production cost and products can be met; and S is usually combined with Mn in steel to form MnS inclusions, and the quantity and the form of sulfides in the steel directly influence the reaming performance and the tensile performance of the high-reaming steel, so that the S content is controlled below 0.008% in actual production.
Al is a deoxidizing element in steel, oxide inclusion in steel can be reduced, crystal grains can be refined, but when the Al is too high, the refining effect is weakened, casting is difficult in production, and therefore, the Als content is reasonably controlled to be 0.02-0.05%.
Nb plays a significant role in grain refinement, phase transformation behavior, and C enrichment in austenite. Nb can effectively prevent austenite grains from growing up and increase the coarsening temperature of the steel. The combination of Nb with C and N to form fine carbonitride can delay recrystallization and prevent ferrite grains from growing, thereby having strong fine grain strengthening effect and stronger precipitation strengthening effect. After Nb is separated out by strain induction in the rolling deformation process, the nucleation position of ferrite is increased, the nucleation rate is improved, and grains are refined. However, the Nb content is too high, the grain refinement and precipitation strengthening effects are not obvious, and the Nb content is reasonably controlled to be 0.020-0.050% in view of cost.
V has fine grain strengthening effect, can obviously improve the yield strength and tensile strength of the material, simultaneously improves the low-temperature impact toughness, and can play roles of precipitation strengthening and solid solution strengthening in steel grades. In addition, the strength and toughness of the steel can be improved during the tempering heat treatment. However, too high an alloy cost is increased, so that the V content of the invention should be controlled to be 0.03% -0.05%.
N, H is a harmful element in steel, and therefore, it can be generalized as an impurity element, in which solid solution N has a strong effect of pinning dislocation and has an adverse effect on toughness, and H element causes adverse effects such as blowholes during welding, so that the lower the content is, the better, but the excessively low content of N, H increases the steelmaking cost, so that the N content is controlled to be 0.0080% or less and the H content is controlled to be 0.0003% or less.
In order to reduce the material cost, the component design adopts the component design of C-Si-Mn+Nb-V-Cr, does not add noble metals such as Mo, rare earth elements and the like with higher cost, effectively reduces the material alloy cost and has good economy. In order to ensure that the material has better welding performance and better crack resistance sensitivity, ceq is controlled to be 0.54-0.70, and pcm is controlled to be 0.36-0.46; in addition, in order to facilitate roll forming before ERW welding, the raw material structure is a ferrite+pearlite structure, and inclusion is controlled; the grain size is more than or equal to 11 levels, the banded structure is less than or equal to 2.5 levels, the tensile strength is less than or equal to 750MPa, the requirement of the material on the capability of welding production line equipment is reduced, the quality of a welding seam is convenient to control, and the occurrence of false welding or unfused defects caused by large deformation resistance after welding of the welding seam is avoided. In the welding process of the steel pipe, the joint opening angle is controlled to be 3-9 degrees, and the extrusion amount is 1-3mm; the ERW welded pipe is subjected to quenching and tempering treatment, the hardness of a finished product is more than or equal to 55HRC, and good wear resistance is obtained.
Ceq provided by the invention: 0.54-0.70, pcm:0.36-0.46, and the hardening structure is obtained by carrying out induction hardening treatment on the steel pipe to improve the hardness of the inner wall so as to obtain good wear resistance, thereby meeting the requirement of a concrete pump truck on the long distance or high conveying capacity of the wear-resistant pipe. Compared with the prior art, the wear-resistant ERW welded steel pipe for the concrete pump truck, which is produced by the raw materials prepared according to the components and the process, has good weldability and formability because of lower Ceq and low strength of a hot rolled finished product (tensile strength is less than or equal to 750 MPa), can obtain hardness which is more than or equal to 55HRC after the welded pipe is subjected to quenching and tempering treatment, and ensures the wear resistance of the finished product. The method can be used for producing and manufacturing the wear-resistant steel pipe for the concrete pump truck and engineering mechanical equipment with higher wear-resistant performance requirements.
Drawings
FIG. 1 is a photograph of a structure of a steel hot rolled coil produced by the present invention;
FIG. 2 is a photograph of the structure of the ERW welded steel pipe finished product produced by the invention.
Detailed Description
The invention is further described below by means of specific examples.
Example 1-example 3
The wear-resistant ERW welded steel pipe for the concrete pump truck comprises the following components in percentage by mass: as shown in table 1, the balance not shown in table 1 is Fe and unavoidable impurities.
Comparative example 1-comparative example 3
The wear-resistant ERW welded steel pipe for the concrete pump truck comprises the following components in percentage by mass: as shown in table 1, the balance not shown in table 1 is Fe and unavoidable impurities.
Table 1 Steel pipe compositions (wt%) of each of examples and comparative examples
The manufacturing method of the wear-resistant ERW welded steel pipe for the concrete pump truck of each embodiment comprises the following process flows:
molten iron pretreatment, steelmaking, alloy fine adjustment station, LF, RH, continuous casting, casting blank hot charging, hot continuous rolling, laminar cooling, coiling, slitting, ERW pipe welding, quenching, tempering and finished product.
The method comprises the following steps:
1) Steelmaking: the method is suitable for smelting in converters, electric furnaces and induction furnaces;
2) Continuous casting: adopting continuous casting to produce casting blanks, adopting a stable speed pouring method and a uniform cooling process with the fluctuation of the molten steel surface of a crystallizer controlled within +/-5 mm, adopting dynamic soft reduction, and utilizing an electromagnetic roller to stir so as to enable impurities to float upwards to obtain good internal quality of the casting blanks;
3) Heating: in order to further ensure the quality of the casting blank, reduce cracks of the casting blank, save energy consumption and carry out assembly by adopting a casting blank hot-charging mode. The heating temperature of the casting blank is 1180-1230 ℃, and the heat preservation is carried out for 2-3 hours, so that the rolling deformation resistance is effectively reduced, and the thicknesses of decarburized layers and oxide layers on the surfaces of the casting blank and the steel plate are reduced;
4) Performing 3+3-pass rough rolling, namely fully starting descaling water, and rough rolling to obtain an intermediate blank with the thickness of 30-50 mm;
5) Performing 7 passes of finish rolling on a 2250mm hot continuous rolling mill, wherein the finish rolling inlet temperature is 960-1060 ℃, the product is required to be subjected to roller replacement before finish rolling in order to ensure the surface quality of the hot rolled product, and the product is required to be rolled in the first 1/2 cycle (namely 45 Km) of a rolling cycle; the final rolling temperature is controlled at 840-900 ℃, and the strip steel is rolled to the thickness of 2.5-6.0mm and the width of 1000-1500 mm;
6) And (3) after finish rolling, rapidly cooling in a front section cooling mode by adopting a laminar cooling mode, wherein the cooling speed is 15-35 ℃/s, coiling into a steel coil at 640-680 ℃, and air cooling to room temperature.
7) Splitting and ERW welding are carried out on the steel coil: in the welding process of the steel pipe, the joint opening angle is controlled to be 3-9 degrees, and the extrusion amount is 1-3mm.
8) Heating an ERW welded pipe in induction heating equipment to 930-970 ℃ for austenitizing, preserving heat for 70-130s, quenching the steel pipe to obtain a steel pipe with a martensitic structure, tempering the quenched steel pipe again at 150-300 ℃ for 100-160min to convert quenched martensite into tempered martensite, and carrying out straightening, flaw detection and other inspection on a pipe blank.
The production process parameters of each example and comparative example are shown in tables 2 and 3.
Table 2 process parameters for each of the examples and comparative examples
Table 3 examples and comparative examples heat treatment process parameters
The underlined data above are data which do not meet the requirements of the present invention.
From the above data, it can be seen that the steels of examples 1 to 3 controlled according to the present invention are excellent in strength, plasticity and hardness of the finished product, and the inclusion control is appropriate; the material strength and the ideal hardness of the quenched material can be ensured, and the wear resistance of the tube blank is ensured. In contrast, in comparative example 1, the strength and hardness of the material were too low due to improper control of part of the chemical components and the A value, ceq and Pcm; in the comparative example 2, although the chemical components are reasonably designed, the material is not quenched due to improper heat treatment process, and the hardness of the final finished product cannot meet the requirement; comparative example 3, although each chemical composition and heat treatment process were carried out according to the present invention, was disadvantageous in terms of ERW welding formation because of high strength and low plasticity of the hot rolled material due to improper hot rolling production process.
FIG. 1 is a structure of a hot rolled steel sheet produced by the invention, which is F+P, the area proportion of pearlite is 55% -70%, the grain size is 11 grade or more, the band-shaped structure is 2.5 grade or less, the material strength is relatively low, and the ERW welding process is convenient for rolling steel tube welding; fig. 2 shows a finished pipe after quenching, the structure of the finished pipe is tempered martensite, and the hardness and the strength of the material are high, so that the finished pipe has better wear resistance than a hot rolled state.
Compared with the patent CN101602079A, the invention can obtain higher hardness of the finished product, the wear resistance is further improved, in addition, the components of the invention do not add noble metals with higher cost such as Mo, rare earth elements and the like, the alloy cost of the material is effectively reduced, and the economy is good; compared with the patents CN102747290A and CN111020370A, the content of C in the components is low, ceq and Pcm are effectively reduced, and the Pcm is less than or equal to 0.46 in the patent, so that the sensitivity of cracks is lower during welding and quenching.
Claims (10)
1. The wear-resistant ERW welded steel pipe for the concrete pump truck is characterized by comprising the following components in percentage by mass:
c:0.30% -0.40%, si:0.15% -0.30%, mn:1.00% -1.80%, P is less than or equal to 0.015%, S is less than or equal to 0.0080%, cr:0.10% -0.30%, als:0.020% -0.050%, nb:0.020% -0.050%, V:0.030% -0.050%, N: less than or equal to 0.0080 percent, H: less than or equal to 0.0003 percent; the balance being Fe and unavoidable impurities.
2. The wear-resistant ERW welded steel pipe for a concrete pump truck according to claim 1, wherein the components of the wear-resistant ERW welded steel pipe for a concrete pump truck satisfy:
a value=37×c+5×cr+8×si+5×mn+10×nb, and an a value of 20.ltoreq.26.
3. The wear-resistant ERW welded steel pipe for a concrete pump truck according to claim 1 or 2, characterized in that the composition of the wear-resistant ERW welded steel pipe for a concrete pump truck satisfies:
d value=53×Nb+10×Mn-53×N-12×S-11×Als, and D value 11.ltoreq.D value.ltoreq.16.
4. The wear-resistant ERW welded steel pipe for a concrete pump truck according to claim 1 or 2, characterized in that the composition of the wear-resistant ERW welded steel pipe for a concrete pump truck satisfies: ceq:0.54 to 0.70;
Pcm:0.36-0.46。
5. a method for manufacturing the wear-resistant ERW welded steel pipe for the concrete pump truck according to any one of claims 1 to 4, which is characterized by comprising the following process flows: molten iron pretreatment, steelmaking, alloy fine adjustment station, LF, RH, continuous casting, casting blank hot charging, hot continuous rolling, laminar cooling, coiling, slitting, ERW pipe welding, quenching, tempering and finished product.
6. The method according to claim 5, wherein the cast slab is hot-charged and the cast slab is heated at 1180 to 1230℃for 2 to 3 hours.
7. The method according to claim 5, wherein the hot continuous rolling is performed at a finish rolling inlet temperature of 960 to 1060 ℃ and a finish rolling temperature of 840 to 900 ℃.
8. The method according to claim 5, wherein the laminar cooling is performed by subjecting the finish rolled strip to a front stage intensive laminar cooling at a cooling rate controlled in the range of 15-35 ℃/s to 640-680 ℃ and air-cooling to room temperature.
9. The manufacturing method according to claim 5, wherein the ERW steel pipe is manufactured by controlling the angle of the joint to 3-9 DEG and the extrusion amount to 1-3mm during welding.
10. The method according to claim 5 or 9, wherein the quenching is performed by heating the ERW welded pipe to 930-970 ℃ in an induction heating apparatus to austenitize for 70-130s, then quenching the steel pipe, and then tempering the steel pipe at 150-300 ℃ for 100-160min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310169797.7A CN116103579B (en) | 2023-02-27 | 2023-02-27 | Wear-resistant ERW welded steel pipe for concrete pump truck and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310169797.7A CN116103579B (en) | 2023-02-27 | 2023-02-27 | Wear-resistant ERW welded steel pipe for concrete pump truck and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116103579A true CN116103579A (en) | 2023-05-12 |
| CN116103579B CN116103579B (en) | 2024-01-30 |
Family
ID=86254249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310169797.7A Active CN116103579B (en) | 2023-02-27 | 2023-02-27 | Wear-resistant ERW welded steel pipe for concrete pump truck and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116103579B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004190086A (en) * | 2002-12-10 | 2004-07-08 | Sumitomo Pipe & Tube Co Ltd | Resistance welded steel tube to be induction-hardened |
| JP2008214651A (en) * | 2007-02-28 | 2008-09-18 | Jfe Steel Kk | Wear resistant steel sheet having excellent weldability |
| CN101451219A (en) * | 2007-12-03 | 2009-06-10 | 舞阳钢铁有限责任公司 | High intensity wear-resistant steel plate and preparation method thereof |
| CN102747290A (en) * | 2012-06-29 | 2012-10-24 | 宝山钢铁股份有限公司 | Economical wear-resistant steel and manufacturing method thereof |
| CN103194688A (en) * | 2013-03-28 | 2013-07-10 | 宝山钢铁股份有限公司 | Wear-resistant steel pipe and manufacture method thereof |
| CN106567001A (en) * | 2016-11-15 | 2017-04-19 | 马鞍山钢铁股份有限公司 | Steel for re-cold-drawing of ERW welding pipe and hot rolling plate roll and preparing method of steel |
| JP6119934B1 (en) * | 2016-04-19 | 2017-04-26 | Ｊｆｅスチール株式会社 | Abrasion resistant steel sheet and method for producing the abrasion resistant steel sheet |
-
2023
- 2023-02-27 CN CN202310169797.7A patent/CN116103579B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004190086A (en) * | 2002-12-10 | 2004-07-08 | Sumitomo Pipe & Tube Co Ltd | Resistance welded steel tube to be induction-hardened |
| JP2008214651A (en) * | 2007-02-28 | 2008-09-18 | Jfe Steel Kk | Wear resistant steel sheet having excellent weldability |
| CN101451219A (en) * | 2007-12-03 | 2009-06-10 | 舞阳钢铁有限责任公司 | High intensity wear-resistant steel plate and preparation method thereof |
| CN102747290A (en) * | 2012-06-29 | 2012-10-24 | 宝山钢铁股份有限公司 | Economical wear-resistant steel and manufacturing method thereof |
| CN103194688A (en) * | 2013-03-28 | 2013-07-10 | 宝山钢铁股份有限公司 | Wear-resistant steel pipe and manufacture method thereof |
| JP6119934B1 (en) * | 2016-04-19 | 2017-04-26 | Ｊｆｅスチール株式会社 | Abrasion resistant steel sheet and method for producing the abrasion resistant steel sheet |
| CN106567001A (en) * | 2016-11-15 | 2017-04-19 | 马鞍山钢铁股份有限公司 | Steel for re-cold-drawing of ERW welding pipe and hot rolling plate roll and preparing method of steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116103579B (en) | 2024-01-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108467993B (en) | Ultra-wide high-toughness hot-rolled thick plate for low-temperature pipeline and production method thereof | |
| CN110295320B (en) | Large-wall-thickness X52MS acid-resistant pipeline steel plate produced by LF-RH refining process and manufacturing method thereof | |
| CN101768698B (en) | Low cost yield strength 700MPA level non-tempering processing high strength steel plate and manufacturing method thereof | |
| CN108642381B (en) | Hot-rolled high-toughness low-temperature-resistant H-shaped steel with yield strength of 460MPa and preparation method thereof | |
| CN102560284B (en) | High-strength high-toughness X100 pipeline steel hot-rolled steel strip and manufacturing method thereof | |
| CN109097699B (en) | 900 MPa-grade hot-rolled automobile girder steel and manufacturing method thereof | |
| CN109023111B (en) | 1000 MPa-grade hot-rolled automobile girder steel and manufacturing method thereof | |
| CN111455269A (en) | Yield strength 960MPa grade very high strength marine steel plate and manufacturing method thereof | |
| CN112226676B (en) | Low-cost L320MS/X46MS hot-rolled steel strip for hydrogen sulfide corrosion resistant welded pipe and manufacturing method thereof | |
| CN111378900B (en) | Steel for wear-resistant and corrosion-resistant chain plate and manufacturing method thereof | |
| WO2022228216A1 (en) | Steel for high-temperature carburized gear shaft and manufacturing method for steel | |
| CN111575578B (en) | Hot-rolled chain plate steel strip with excellent wear resistance and manufacturing method thereof | |
| CN113528944A (en) | 1000MPa easily-formed wear-resistant steel plate and preparation method thereof | |
| CN111549274A (en) | Wear-resistant Nb-containing chain plate hot-rolled steel strip and manufacturing method thereof | |
| CN110284066B (en) | Thin-gauge low-yield-ratio pipeline steel and manufacturing method thereof | |
| CN114774770B (en) | Low-cost anti-HIC (hydrogen induced cracking) L290 hot rolled steel plate for oil and gas pipelines and manufacturing method thereof | |
| CN111321354A (en) | X70M hot-rolled steel strip and manufacturing method thereof | |
| CN111534746A (en) | Weather-resistant steel for wide 450 MPa-grade hot-rolled container and manufacturing method thereof | |
| CN114737109B (en) | Steel for X52 straight welded pipe for thick-wall HIC-resistant oil and gas pipeline and manufacturing method thereof | |
| CN112375997B (en) | Manufacturing method of X70M pipeline steel plate used under low-cost and ultralow-temperature conditions | |
| CN116103579B (en) | Wear-resistant ERW welded steel pipe for concrete pump truck and manufacturing method thereof | |
| CN110284077B (en) | Manufacturing method of thin-gauge high-toughness pipeline steel | |
| CN114341386B (en) | Steel material excellent in strength and low-temperature impact toughness and method for producing same | |
| CN115161553B (en) | Hot rolled H-shaped steel with 550 MPa-grade yield strength and low-temperature impact toughness at minus 20 ℃ in longitudinal and transverse directions and production method thereof | |
| CN113862569B (en) | Steel with low friction coefficient and excellent fatigue property for automobile hollow stabilizer bar and production 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 |