CN114774784A - Large-caliber alloy steel pipe fitting and machining process thereof - Google Patents

Large-caliber alloy steel pipe fitting and machining process thereof Download PDF

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Publication number
CN114774784A
CN114774784A CN202210356198.1A CN202210356198A CN114774784A CN 114774784 A CN114774784 A CN 114774784A CN 202210356198 A CN202210356198 A CN 202210356198A CN 114774784 A CN114774784 A CN 114774784A
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percent
caliber
alloy steel
steel pipe
treatment
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CN114774784B (en
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沈磊
刘叶佳
周秋华
陆楠
卢佳
徐鹏飞
陈盼
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Jiangsu Longshan Pipe Fittings Co ltd
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Jiangsu Longshan Pipe Fittings Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • 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
    • 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
    • C21D8/10—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
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/40—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates
    • C23C22/42—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates containing also phosphates
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/02—Pretreatment of the material to be coated

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  • Crystallography & Structural Chemistry (AREA)
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Abstract

The invention discloses a large-caliber alloy steel pipe fitting, and particularly relates to the technical field of flange bolts, which comprises the following raw materials: carbon, silicon, manganese, chromium, aluminum, zirconium, molybdenum, nickel, niobium, lead, cerium, strontium, calcium, sulfur, phosphorus, and the balance of iron and unavoidable impurities. The aluminum-silicon phase has higher specific strength, specific stiffness, corrosion resistance and fatigue resistance, and lead is used as a plastic soft metal, so that the compressibility of the material can be improved, gaps among powder particles can be filled, the lead can be used as a lubricant to be filled into the aluminum-silicon phase to reduce the friction coefficient of the material, the friction resistance of the alloy steel pipe is improved, and the lead and the calcium can form Pb in the alloy steel3The Ca fine grain precipitates, the mechanical property of the alloy steel can be improved, the corrosion resistance effect is better, the service life of the electroslag remelting steel microalloyed by zirconium and calcium is prolonged, and the grindability is improved.

Description

Large-caliber alloy steel pipe fitting and machining process thereof
Technical Field
The invention relates to the technical field of alloy steel pipe fittings, in particular to a large-caliber alloy steel pipe fitting and a processing technology thereof.
Background
Steel pipes have a hollow cross section and are used in large numbers as pipes for transporting fluids, such as oil, gas, water and certain solid materials. Compared with solid steel such as round steel, the steel tube has the advantages of same bending strength and torsion strength and lighter weight, is steel with an economic section, is widely used for manufacturing structural parts and mechanical parts, such as petroleum drill rods, automobile transmission shafts, bicycle frames, steel scaffold used in building construction and the like, is used for manufacturing annular parts by using the steel tube, can improve the material utilization rate, simplifies the manufacturing process, saves materials and processing time, and is widely manufactured by using the steel tube. At present, the proportion of the consumption of the large-diameter alloy steel pipes in the total amount of steel products in China is only half of that of the large-diameter alloy steel pipes in developed countries, and the application field of the large-diameter alloy steel pipes is expanded to provide wider space for the development of industries.
Along with the increase of the alloy content in the processing process of the existing large-caliber alloy steel pipe, the processing plasticity of alloy steel is reduced, the deformation resistance is increased, the processing is difficult, the mechanical property is insufficient, and the service life is short.
Disclosure of Invention
In order to overcome the above defects in the prior art, embodiments of the present invention provide a large-caliber alloy steel pipe fitting and a processing technology thereof, and the present invention aims to solve the following problems: how to improve the processing property and the mechanical property of the large-caliber alloy steel pipe fitting, and improve the yield and the service life of the large-caliber alloy steel pipe fitting.
In order to achieve the purpose, the invention provides the following technical scheme: a large-caliber alloy steel pipe fitting comprises the following raw materials in percentage by weight: 0.05 to 0.2 percent of carbon, 0.1 to 0.3 percent of silicon, 0.2 to 0.6 percent of manganese, 0.5 to 1.5 percent of chromium, 0.2 to 0.8 percent of aluminum, 0.1 to 0.3 percent of zirconium, 0.25 to 0.4 percent of molybdenum, 0.05 to 0.15 percent of nickel, 0.1 to 0.3 percent of niobium, 0.2 to 0.5 percent of lead, 0.05 to 0.25 percent of cerium, 0.15 to 0.35 percent of strontium, 0.04 to 0.1 percent of calcium, less than or equal to 0.015 percent of sulfur, less than or equal to 0.015 percent of phosphorus, and the balance of iron and inevitable impurities.
In a preferred embodiment, the composition comprises the following raw materials in percentage by weight: 0.1 to 0.15 percent of carbon, 0.15 to 0.25 percent of silicon, 0.3 to 0.5 percent of manganese, 0.8 to 1.2 percent of chromium, 0.4 to 0.6 percent of aluminum, 0.15 to 0.25 percent of zirconium, 0.3 to 0.35 percent of molybdenum, 0.08 to 0.12 percent of nickel, 0.15 to 0.25 percent of niobium, 0.3 to 0.4 percent of lead, 0.1 to 0.2 percent of cerium, 0.2 to 0.3 percent of strontium, 0.06 to 0.08 percent of calcium, less than or equal to 0.015 percent of sulfur, less than or equal to 0.015 percent of phosphorus, and the balance of iron and inevitable impurities.
In a preferred embodiment, the material comprises the following raw materials in percentage by weight: 0.125% of carbon, 0.2% of silicon, 0.4% of manganese, 0.1% of chromium, 0.5% of aluminum, 0.2% of zirconium, 0.32% of molybdenum, 0.1% of nickel, 0.2% of niobium, 0.35% of lead, 0.15% of cerium, 0.25% of strontium, 0.07% of calcium, less than or equal to 0.015% of sulfur, less than or equal to 0.015% of phosphorus, and the balance of iron and inevitable impurities.
In a preferred embodiment, said unavoidable impurities are 0.005% or less and said contents of sulfur and phosphorus are not zero.
A processing technology of a large-caliber alloy steel pipe fitting comprises the following specific preparation steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, putting the weighed scrap steel into an electric furnace for heating and melting, adding the weighed carbon, silicon, manganese, chromium, aluminum, sulfur, phosphorus and molybdenum into the electric furnace for heating and continuous melting, adding a deoxidizer for deoxidation after the melting is finished, adding the weighed zirconium, nickel, niobium, lead, cerium, strontium and calcium into the electric furnace for continuous heating and melting after the deoxidation, and then sampling and measuring the percentage content of each element to obtain mixed molten steel;
step two: injecting the mixed molten steel obtained in the step one into a mold for vacuum degassing casting, obtaining a steel billet after casting, heating the obtained steel billet to 1300-1400 ℃, and then performing center punching to obtain a large-diameter hollow pipe blank;
step three: putting the large-caliber hollow pipe blank obtained in the step two into an annealing furnace for primary annealing treatment, and then carrying out acid pickling treatment on the large-caliber hollow pipe blank after the primary annealing is finished;
step four: carrying out high-pressure descaling treatment on the large-diameter hollow pipe blank subjected to the acid pickling treatment in the step three, and carrying out carburizing and quenching treatment after the high-pressure descaling is finished;
step five: performing cold rolling treatment on the large-caliber hollow pipe blank obtained in the fourth step by using a cold rolling mill, performing cold drawing treatment on the large-caliber hollow pipe blank after cold rolling, and adjusting the diameter of the large-caliber hollow pipe blank and the length of a drawn steel pipe;
step six: and (5) placing the large-caliber hollow pipe blank subjected to cold rolling and cold drawing in the fifth step into an annealing furnace for secondary annealing treatment, cooling to room temperature after the secondary annealing treatment, and then polishing to obtain the large-caliber alloy steel pipe fitting.
In a preferred embodiment, the internal temperature of the electric furnace in the first step is 1400-.
In a preferred embodiment, the internal temperature of the annealing furnace in the third step is 780-850 ℃, the heat preservation time is 2-4h, the pickling treatment in the third step is carried out by soaking in a pickling solution for 15-30min, and the water is used for washing after the pickling is finished.
In a preferred embodiment, during the high-pressure dephosphorization in the fourth step, the outer side wall and the inner side wall of the large-caliber hollow shell are washed by using a phosphating solution under the pressure of 3-8Pa, the phosphating solution is preheated at the temperature of 60-70 ℃ before use, and the carburizing and quenching in the fourth step are carried out at the temperature of 820-.
In a preferred embodiment, the number of cold drawing in the step five is 2-4, and the phosphating solution in the step three comprises the following components in percentage by weight: 10-15% of phosphoric acid, 2-4% of zinc oxide, 1-3% of sodium dihydrogen phosphate, 1.5-2% of ammonium molybdate, 1-2% of oxidation promoter, 0.5-1.2% of low-temperature promoter, 3-6% of phytic acid and 10-18% of water.
In a preferred embodiment, the internal temperature of the annealing furnace in the sixth step is 900-950 ℃, and the heat preservation time is 2-3 h.
The invention has the technical effects and advantages that:
1. the large-caliber alloy steel pipe prepared by adopting the raw material formula disclosed by the invention is added with chromium, aluminum, molybdenum, nickel, zirconium, niobium, lead, strontium and calcium, the cutting performance of alloy steel can be improved by adding lead and calcium, the deformation resistance of the alloy steel is reduced, the yield of the alloy steel pipe is increased, the strength and the corrosion resistance of the steel pipe can be effectively improved by adding chromium, an aluminum-silicon phase has higher specific strength, specific rigidity, corrosion resistance and fatigue resistance, lead is used as a plastic soft metal, the compressibility of the material can be improved, gaps among powder particles can be filled, the lead can be used as a lubricant to be filled into the aluminum-silicon phase, the friction coefficient of the material can be reduced, the friction resistance of the alloy steel pipe is improved, and Pb and calcium lead can be formed in the alloy steel3The Ca fine grain precipitation can not only improve the mechanical property of the alloy steel, but also has better corrosion resistance effect, the service life of the electroslag remelting steel microalloyed by zirconium and calcium is prolonged, and the quality of the electroslag remelting steel is improvedThe grindability, the microalloying inoculation treatment of zirconium and calcium promote finer grains and uniform tissues, and the cerium is added, so that not only can the mechanical property of alloy steel be improved, but also the phenomena of cracking and strip breaking caused by the addition of lead element can be improved, and the processing property of the alloy steel pipe is improved;
2. according to the invention, the alloy steel pipe is prevented from cracking after two times of annealing treatment, so that the cracking problem is effectively solved, the alloy steel pipe has good processing performance, high yield and stable performance, and waste products are avoided.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the invention provides a large-caliber alloy steel pipe fitting which comprises the following raw materials in percentage by weight: 0.05% of carbon, 0.1% of silicon, 0.2% of manganese, 0.5% of chromium, 0.2% of aluminum, 0.1% of zirconium, 0.25% of molybdenum, 0.05% of nickel, 0.1% of niobium, 0.2% of lead, 0.05% of cerium, 0.15% of strontium, 0.04% of calcium, 0.01% of sulfur, 0.01% of phosphorus, and the balance iron and inevitable impurities.
In a preferred embodiment, said unavoidable impurities are 0.005% or less and said contents of sulfur and phosphorus are not zero.
A processing technology of a large-caliber alloy steel pipe fitting comprises the following specific preparation steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, putting the weighed scrap steel into an electric furnace for heating and melting, adding the weighed carbon, silicon, manganese, chromium, aluminum, sulfur, phosphorus and molybdenum into the electric furnace for heating and continuing to melt, adding a deoxidizing agent for deoxidation treatment after melting is finished, adding the weighed zirconium, nickel, niobium, lead, cerium, strontium and calcium into the electric furnace for continuing heating and melting after deoxidation, and then sampling and measuring the percentage content of each element to obtain mixed molten steel;
step two: injecting the mixed molten steel obtained in the step one into a mold for vacuum degassing casting, obtaining a steel billet after casting, heating the obtained steel billet to 1350 ℃, and then performing center piercing to obtain a large-caliber hollow pipe billet;
step three: putting the large-caliber hollow pipe blank obtained in the step two into an annealing furnace for primary annealing treatment, and then carrying out acid pickling treatment on the large-caliber hollow pipe blank after the primary annealing is finished;
step four: carrying out high-pressure descaling treatment on the large-caliber hollow pipe blank subjected to the acid pickling treatment in the third step, and carrying out carburizing and quenching treatment after the high-pressure descaling treatment is finished;
step five: performing cold rolling treatment on the large-caliber hollow pipe blank obtained in the fourth step by using a cold rolling mill, performing cold drawing treatment on the large-caliber hollow pipe blank after cold rolling, and adjusting the diameter of the large-caliber hollow pipe blank and the length of a drawn steel pipe;
step six: and (4) placing the large-caliber hollow pipe blank subjected to cold rolling and cold drawing in the step five into an annealing furnace for secondary annealing treatment, cooling to room temperature after the secondary annealing treatment, and then performing polishing treatment to obtain the large-caliber alloy steel pipe fitting.
In a preferred embodiment, the internal temperature of the electric furnace in the first step is 1450 ℃, the temperature after the first temperature rise is 1550 ℃, the temperature after the second temperature rise is 1680 ℃, and the deoxidizer in the first step is ferrosilicon.
In a preferred embodiment, the internal temperature of the annealing furnace in the third step is 810 ℃, the heat preservation time is 3 hours, the pickling treatment in the third step is carried out by soaking in the pickling solution for 22min, and the water is used for washing after the pickling is finished.
In a preferred embodiment, during the high-pressure dephosphorization in the fourth step, the outer side wall and the inner side wall of the large-caliber hollow pipe blank are washed by using a phosphating solution under the pressure of 5Pa, the phosphating solution is preheated at the temperature of 65 ℃ before use, and during the carburizing and quenching treatment in the fourth step, the temperature is 840 ℃ and the time is 10 min.
In a preferred embodiment, the number of cold drawing in the step five is 3, and the phosphating solution in the step three comprises the following components in percentage by weight: 13% of phosphoric acid, 3% of zinc oxide, 2% of sodium dihydrogen phosphate, 1.8% of ammonium molybdate, 1.5% of oxidation accelerator, 0.8% of low-temperature accelerator, 5% of phytic acid and 14% of water.
In a preferred embodiment, the temperature inside the annealing furnace in the sixth step is 930 ℃ and the holding time is 2.5 h.
Example 2:
different from the embodiment 1, the large-caliber alloy steel pipe fitting comprises the following raw materials in percentage by weight: 0.125% of carbon, 0.2% of silicon, 0.4% of manganese, 0.1% of chromium, 0.5% of aluminum, 0.2% of zirconium, 0.32% of molybdenum, 0.1% of nickel, 0.2% of niobium, 0.35% of lead, 0.15% of cerium, 0.25% of strontium, 0.07% of calcium, 0.01% of sulfur, 0.01% of phosphorus, and the balance iron and inevitable impurities.
Example 3:
different from the embodiments 1-2, the large-caliber alloy steel pipe fitting comprises the following raw materials in percentage by weight: 0.2% of carbon, 0.3% of silicon, 0.6% of manganese, 1.5% of chromium, 0.8% of aluminum, 0.3% of zirconium, 0.4% of molybdenum, 0.15% of nickel, 0.3% of niobium, 0.5% of lead, 0.25% of cerium, 0.35% of strontium, 0.1% of calcium, 0.01% of sulfur, 0.01% of phosphorus, and the balance of iron and inevitable impurities.
Example 4:
the invention provides a large-caliber alloy steel pipe fitting which comprises the following raw materials in percentage by weight: 0.05% of carbon, 0.1% of silicon, 0.2% of manganese, 0.5% of chromium, 0.2% of aluminum, 0.1% of zirconium, 0.25% of molybdenum, 0.05% of nickel, 0.1% of niobium, 0.05% of cerium, 0.15% of strontium, 0.01% of sulfur, 0.01% of phosphorus, and the balance of iron and inevitable impurities.
In a preferred embodiment, the unavoidable impurities are 0.005% or less, and the contents of sulfur and phosphorus are not zero.
A processing technology of a large-caliber alloy steel pipe fitting comprises the following specific preparation steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, putting the weighed scrap steel into an electric furnace for heating and melting, adding the weighed carbon, silicon, manganese, chromium, aluminum, sulfur, phosphorus and molybdenum into the electric furnace for heating and continuing to melt, adding a deoxidizing agent for deoxidation treatment after melting is finished, adding the weighed zirconium, nickel, niobium, cerium and strontium into the electric furnace for continuing heating and melting after deoxidation, and then sampling and measuring the percentage content of each element to obtain mixed molten steel;
step two: injecting the mixed molten steel obtained in the step one into a mold for vacuum degassing casting, obtaining a steel billet after casting, heating the obtained steel billet to 1350 ℃, and then performing center piercing to obtain a large-diameter hollow pipe blank;
step three: putting the large-caliber hollow pipe blank obtained in the step two into an annealing furnace for primary annealing treatment, and then carrying out acid pickling treatment on the large-caliber hollow pipe blank after the primary annealing is finished;
step four: carrying out high-pressure descaling treatment on the large-diameter hollow pipe blank subjected to the acid pickling treatment in the step three, and carrying out carburizing and quenching treatment after the high-pressure descaling is finished;
step five: performing cold rolling treatment on the large-caliber hollow pipe blank obtained in the fourth step by using a cold rolling mill, performing cold drawing treatment on the large-caliber hollow pipe blank after cold rolling, and adjusting the diameter of the large-caliber hollow pipe blank and the length of a drawn steel pipe;
step six: and (5) placing the large-caliber hollow pipe blank subjected to cold rolling and cold drawing in the fifth step into an annealing furnace for secondary annealing treatment, cooling to room temperature after the secondary annealing treatment, and then polishing to obtain the large-caliber alloy steel pipe fitting.
In a preferred embodiment, the internal temperature of the electric furnace in the first step is 1450 ℃, the temperature after the first temperature rise is 1550 ℃, the temperature after the second temperature rise is 1680 ℃, and the deoxidizer in the first step is ferrosilicon.
In a preferred embodiment, the internal temperature of the annealing furnace in the third step is 810 ℃, the heat preservation time is 3 hours, the pickling treatment in the third step is carried out by soaking in the pickling solution for 22min, and the water is used for washing after the pickling is finished.
In a preferred embodiment, during the high-pressure dephosphorization in the fourth step, the outer side wall and the inner side wall of the large-caliber hollow pipe blank are washed by phosphating solution under the pressure of 5Pa, the phosphating solution is preheated before being used, the preheating temperature is 65 ℃, and during the carburizing and quenching treatment in the fourth step, the temperature is 840 ℃ and the time is 10 min.
In a preferred embodiment, the number of cold drawing in the step five is 3, and the phosphating solution in the step three comprises the following components in percentage by weight: 13% of phosphoric acid, 3% of zinc oxide, 2% of sodium dihydrogen phosphate, 1.8% of ammonium molybdate, 1.5% of oxidation promoter, 0.8% of low-temperature promoter, 5% of phytic acid and 14% of water.
In a preferred embodiment, the temperature inside the annealing furnace in the sixth step is 930 ℃, and the holding time is 2.5 h.
Example 5:
the invention provides a large-caliber alloy steel pipe fitting which comprises the following raw materials in percentage by weight: 0.05% of carbon, 0.1% of silicon, 0.2% of manganese, 0.5% of chromium, 0.2% of aluminum, 0.1% of zirconium, 0.25% of molybdenum, 0.05% of nickel, 0.1% of niobium, 0.2% of lead, 0.15% of strontium, 0.04% of calcium, 0.01% of sulfur, 0.01% of phosphorus, and the balance of iron and inevitable impurities.
In a preferred embodiment, said unavoidable impurities are 0.005% or less and said contents of sulfur and phosphorus are not zero.
A processing technology of a large-caliber alloy steel pipe fitting comprises the following specific preparation steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, putting the weighed scrap steel into an electric furnace for heating and melting, adding the weighed carbon, silicon, manganese, chromium, aluminum, sulfur, phosphorus and molybdenum into the electric furnace for heating and continuous melting, adding a deoxidizer for deoxidation after the melting is finished, adding the weighed zirconium, nickel, niobium, lead, strontium and calcium into the electric furnace for continuous heating and melting after the deoxidation, and then sampling and measuring the percentage content of each element to obtain mixed molten steel;
step two: injecting the mixed molten steel obtained in the step one into a mold for vacuum degassing casting, obtaining a steel billet after casting, heating the obtained steel billet to 1350 ℃, and then performing center piercing to obtain a large-caliber hollow pipe billet;
step three: putting the large-caliber hollow pipe blank obtained in the step two into an annealing furnace for primary annealing treatment, and then carrying out acid pickling treatment on the large-caliber hollow pipe blank after the primary annealing is finished;
step four: carrying out high-pressure descaling treatment on the large-caliber hollow pipe blank subjected to the acid pickling treatment in the third step, and carrying out carburizing and quenching treatment after the high-pressure descaling treatment is finished;
step five: performing cold rolling treatment on the large-caliber hollow pipe blank obtained in the fourth step by using a cold rolling mill, performing cold drawing treatment on the large-caliber hollow pipe blank after cold rolling, and adjusting the diameter of the large-caliber hollow pipe blank and the length of a drawn steel pipe;
step six: and (5) placing the large-caliber hollow pipe blank subjected to cold rolling and cold drawing in the fifth step into an annealing furnace for secondary annealing treatment, cooling to room temperature after the secondary annealing treatment, and then polishing to obtain the large-caliber alloy steel pipe fitting.
In a preferred embodiment, the internal temperature of the electric furnace in the first step is 1450 ℃, the temperature after the first temperature rise is 1550 ℃, the temperature after the second temperature rise is 1680 ℃, and the deoxidizer in the first step is ferrosilicon.
In a preferred embodiment, the internal temperature of the annealing furnace in the third step is 810 ℃, the heat preservation time is 3 hours, the pickling treatment in the third step is carried out by soaking in the pickling solution for 22min, and the water is used for washing after the pickling is finished.
In a preferred embodiment, during the high-pressure dephosphorization in the fourth step, the outer side wall and the inner side wall of the large-caliber hollow pipe blank are washed by phosphating solution under the pressure of 5Pa, the phosphating solution is preheated before being used, the preheating temperature is 65 ℃, and during the carburizing and quenching treatment in the fourth step, the temperature is 840 ℃ and the time is 10 min.
In a preferred embodiment, the number of cold drawing in the fifth step is 3, and the phosphating solution in the third step comprises the following components in percentage by weight: 13% of phosphoric acid, 3% of zinc oxide, 2% of sodium dihydrogen phosphate, 1.8% of ammonium molybdate, 1.5% of oxidation accelerator, 0.8% of low-temperature accelerator, 5% of phytic acid and 14% of water.
In a preferred embodiment, the temperature inside the annealing furnace in the sixth step is 930 ℃, and the holding time is 2.5 h.
Control group:
the invention provides a large-caliber alloy steel pipe fitting which comprises the following raw materials in percentage by weight: 0.15% of carbon, 0.23% of silicon, 0.55% of manganese, 0.85% of chromium, 0.01% of sulfur, 0.01% of phosphorus, and the balance of iron and inevitable impurities.
In a preferred embodiment, said unavoidable impurities are 0.005% or less and said contents of sulfur and phosphorus are not zero.
A processing technology of a large-caliber alloy steel pipe fitting comprises the following specific preparation steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, putting the weighed scrap steel into an electric furnace for heating and melting, adding the weighed carbon, silicon, manganese, chromium, sulfur and phosphorus into the electric furnace for heating and continuous melting, adding a deoxidizing agent for deoxidizing treatment after the melting is finished, and sampling and measuring the percentage content of each element to obtain mixed molten steel;
step two: injecting the mixed molten steel obtained in the step one into a mold for vacuum degassing casting, obtaining a steel billet after casting, heating the obtained steel billet to 1350 ℃, and then performing center piercing to obtain a large-caliber hollow pipe billet;
step three: putting the large-caliber hollow pipe blank obtained in the step two into an annealing furnace for primary annealing treatment, and then carrying out acid pickling treatment on the large-caliber hollow pipe blank after the primary annealing is finished;
step four: carrying out high-pressure descaling treatment on the large-caliber hollow pipe blank subjected to the acid pickling treatment in the third step, and carrying out carburizing and quenching treatment after the high-pressure descaling treatment is finished;
step five: performing cold rolling treatment on the large-caliber hollow pipe blank obtained in the fourth step by using a cold rolling mill, performing cold drawing treatment on the large-caliber hollow pipe blank after cold rolling, and adjusting the diameter of the large-caliber hollow pipe blank and the length of a drawn steel pipe;
step six: and (5) placing the large-caliber hollow pipe blank subjected to cold rolling and cold drawing in the fifth step into an annealing furnace for secondary annealing treatment, cooling to room temperature after the secondary annealing treatment, and then polishing to obtain the large-caliber alloy steel pipe fitting.
In a preferred embodiment, the internal temperature of the electric furnace in the first step is 1450 ℃, the temperature after the first temperature rise is 1550 ℃, and the deoxidizer in the first step is ferrosilicon.
In a preferred embodiment, the internal temperature of the annealing furnace in the third step is 810 ℃, the holding time is 3 hours, the acid pickling in the third step is carried out for 22min, and the water is used for rinsing after the acid pickling is finished.
In a preferred embodiment, during the high-pressure dephosphorization in the fourth step, the outer side wall and the inner side wall of the large-caliber hollow pipe blank are washed by phosphating solution under the pressure of 5Pa, the phosphating solution is preheated before being used, the preheating temperature is 65 ℃, and during the carburizing and quenching treatment in the fourth step, the temperature is 840 ℃ and the time is 10 min.
In a preferred embodiment, the number of cold drawing in the step five is 3, and the phosphating solution in the step three comprises the following components in percentage by weight: 13% of phosphoric acid, 3% of zinc oxide, 2% of sodium dihydrogen phosphate, 1.8% of ammonium molybdate, 1.5% of oxidation accelerator, 0.8% of low-temperature accelerator, 5% of phytic acid and 14% of water.
In a preferred embodiment, the temperature inside the annealing furnace in the sixth step is 930 ℃ and the holding time is 2.5 h.
The large-caliber alloy steel pipe fittings prepared in the embodiments 1-5 are respectively taken as an experiment group 1, an experiment group 2, an experiment group 3, an experiment group 4 and an experiment group 5, alloy steel pipe fittings produced by a comparison group (the comparison group raw material is similar to 20Cr alloy steel raw material) are respectively used as a comparison group for testing, the tensile strength, the yield strength, the abrasion resistance and the corrosion resistance of the selected large-caliber alloy steel pipe fittings are respectively tested (the tensile strength and the yield strength adopt GB/T228-02, ASTME8M-08, ISO 6892- The alloy steel pipe is soaked and corroded, the corrosion rate is measured in the same time), and the yield of the product is recorded. The test results are shown in table one:
Figure BDA0003583029060000111
Figure BDA0003583029060000121
watch 1
As can be seen from table one, the large-caliber alloy steel pipe fitting produced by the invention has stronger tensile strength and yield strength compared with the traditional Cr20 alloy steel pipe, better wear resistance and corrosion resistance effects and high yield, example 4 is less in lead and calcium in comparison with example 1, the tensile strength and yield strength of the large-caliber alloy steel pipe fitting are less in change compared with example 1, the wear resistance and corrosion resistance are reduced, and the yield is reduced, while example 5 is less in addition of cerium in comparison with example 1, the tensile strength, yield strength, wear resistance and corrosion resistance of the large-caliber alloy steel pipe fitting are reduced, and the yield is reduced in comparison with example 1; therefore, the alloy steel is added with chromium, aluminum, molybdenum, nickel, zirconium, niobium, lead, strontium and calcium, the cutting performance of the alloy steel can be improved by adding lead and calcium, the deformation resistance of the alloy steel is reduced, the yield of alloy steel pipes is increased, the strength and the corrosion resistance of steel pipe fittings can be effectively improved by adding chromium, the aluminum-silicon phase has higher specific strength, specific rigidity, corrosion resistance and fatigue resistance, lead is used as a plastic soft metal, the compressibility of the material can be improved, gaps among powder particles can be filled, the lead can be used as a lubricant to be filled into the aluminum-silicon phase, the friction coefficient of the material can be reduced, the friction resistance of the alloy steel pipes is improved, and Pb and calcium can form Pb in the alloy steel3The Ca fine grain precipitation can not only improve the mechanical property of the alloy steel, but also has better corrosion resistance effect, the zirconium and calcium microalloyed electroslag remelting steel improves the service life and the grindability,the microalloying inoculation treatment of zirconium and calcium promotes finer grains and uniform tissues, and cerium is added, so that the mechanical property of alloy steel can be improved, the phenomena of cracking and strip breaking caused by addition of lead elements can be improved, and the processing property of the alloy steel pipe is improved.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A heavy-calibre alloy steel pipe fitting which is characterized in that: comprises the following raw materials in percentage by weight: 0.05 to 0.2 percent of carbon, 0.1 to 0.3 percent of silicon, 0.2 to 0.6 percent of manganese, 0.5 to 1.5 percent of chromium, 0.2 to 0.8 percent of aluminum, 0.1 to 0.3 percent of zirconium, 0.25 to 0.4 percent of molybdenum, 0.05 to 0.15 percent of nickel, 0.1 to 0.3 percent of niobium, 0.2 to 0.5 percent of lead, 0.05 to 0.25 percent of cerium, 0.15 to 0.35 percent of strontium, 0.04 to 0.1 percent of calcium, less than or equal to 0.015 percent of sulfur, less than or equal to 0.015 percent of phosphorus, and the balance of iron and inevitable impurities.
2. A large-caliber alloy steel pipe fitting according to claim 1, characterized in that: comprises the following raw materials in percentage by weight: 0.1 to 0.15 percent of carbon, 0.15 to 0.25 percent of silicon, 0.3 to 0.5 percent of manganese, 0.8 to 1.2 percent of chromium, 0.4 to 0.6 percent of aluminum, 0.15 to 0.25 percent of zirconium, 0.3 to 0.35 percent of molybdenum, 0.08 to 0.12 percent of nickel, 0.15 to 0.25 percent of niobium, 0.3 to 0.4 percent of lead, 0.1 to 0.2 percent of cerium, 0.2 to 0.3 percent of strontium, 0.06 to 0.08 percent of calcium, less than or equal to 0.015 percent of sulfur, less than or equal to 0.015 percent of phosphorus, and the balance of iron and inevitable impurities.
3. The large-caliber alloy steel pipe fitting according to claim 1, wherein: comprises the following raw materials in percentage by weight: 0.125% of carbon, 0.2% of silicon, 0.4% of manganese, 0.1% of chromium, 0.5% of aluminum, 0.2% of zirconium, 0.32% of molybdenum, 0.1% of nickel, 0.2% of niobium, 0.35% of lead, 0.15% of cerium, 0.25% of strontium, 0.07% of calcium, less than or equal to 0.015% of sulfur, less than or equal to 0.015% of phosphorus and the balance of iron and inevitable impurities.
4. A large-caliber alloy steel pipe fitting according to claim 1, characterized in that: the content of the inevitable impurities is less than or equal to 0.005 percent, and the content of the sulfur and the phosphorus is not zero.
5. A processing technology of a large-caliber alloy steel pipe fitting is characterized by comprising the following steps: the preparation method comprises the following specific steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, putting the weighed scrap steel into an electric furnace for heating and melting, adding the weighed carbon, silicon, manganese, chromium, aluminum, sulfur, phosphorus and molybdenum into the electric furnace for heating and continuing to melt, adding a deoxidizing agent for deoxidation treatment after melting is finished, adding the weighed zirconium, nickel, niobium, lead, cerium, strontium and calcium into the electric furnace for continuing heating and melting after deoxidation, and then sampling and measuring the percentage content of each element to obtain mixed molten steel;
step two: injecting the mixed molten steel obtained in the step one into a mold for vacuum degassing casting, obtaining a steel billet after casting, heating the obtained steel billet to 1300-1400 ℃, and then performing center piercing to obtain a large-diameter hollow pipe blank;
step three: putting the large-caliber hollow pipe blank obtained in the step two into an annealing furnace for primary annealing treatment, and then carrying out acid pickling treatment on the large-caliber hollow pipe blank after the primary annealing is finished;
step four: carrying out high-pressure descaling treatment on the large-diameter hollow pipe blank subjected to the acid pickling treatment in the step three, and carrying out carburizing and quenching treatment after the high-pressure descaling is finished;
step five: performing cold rolling treatment on the large-caliber hollow pipe blank obtained in the fourth step by using a cold rolling mill, performing cold drawing treatment on the large-caliber hollow pipe blank after cold rolling, and adjusting the diameter of the large-caliber hollow pipe blank and the length of a drawn steel pipe;
step six: and (4) placing the large-caliber hollow pipe blank subjected to cold rolling and cold drawing in the step five into an annealing furnace for secondary annealing treatment, cooling to room temperature after the secondary annealing treatment, and then performing polishing treatment to obtain the large-caliber alloy steel pipe fitting.
6. The machining process of the large-caliber alloy steel pipe fitting according to claim 5, characterized in that: the internal temperature of the electric furnace in the first step is 1400-1450 ℃, the temperature after the first temperature rise is 1520-1580 ℃, the temperature after the second temperature rise is 1650-1700 ℃, and the deoxidizer in the first step is ferrosilicon.
7. The machining process of the large-caliber alloy steel pipe fitting according to claim 5, characterized in that: the internal temperature of the annealing furnace in the third step is 780-850 ℃, the heat preservation time is 2-4h, the annealing furnace is soaked in the pickling solution for 15-30min during the pickling treatment in the third step, and the annealing furnace is washed by water after the pickling is finished.
8. The machining process of the large-caliber alloy steel pipe fitting according to claim 5, characterized in that: and in the fourth step, during high-pressure dephosphorization, the outer side wall and the inner side wall of the large-diameter hollow pipe blank are washed by using phosphating solution under the pressure of 3-8Pa, the phosphating solution is preheated at the temperature of 60-70 ℃ before use, and the carburizing and quenching treatment in the fourth step is carried out at the temperature of 820-860 ℃ for 8-12 min.
9. The machining process of the large-caliber alloy steel pipe fitting according to claim 8, characterized in that: the number of cold drawing in the step five is 2-4, and the phosphating solution in the step three comprises the following components in percentage by weight: 10-15% of phosphoric acid, 2-4% of zinc oxide, 1-3% of sodium dihydrogen phosphate, 1.5-2% of ammonium molybdate, 1-2% of oxidation promoter, 0.5-1.2% of low-temperature promoter, 3-6% of phytic acid and 10-18% of water.
10. The machining process of the large-caliber alloy steel pipe fitting according to claim 5, characterized in that: the internal temperature of the annealing furnace in the sixth step is 900-950 ℃, and the heat preservation time is 2-3 h.
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