CN108660361A - Hot rolled seamless steel tube high speed steel roll collar and preparation method thereof - Google Patents
Hot rolled seamless steel tube high speed steel roll collar and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/36—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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Abstract
Hot rolled seamless steel tube high speed steel roll collar and preparation method thereof belongs to steel tube fabrication technique field.Melting high-speed steel molten steel in medium-frequency induction furnace, and adjust the chemical composition of high-speed steel molten steel：3.22 3.45%C, 1.07 1.22%W, 2.39 2.61%Mo, 1.55 1.86%V, 12.44 12.67%Cr, 0.37 0.54%Mn, 0.63 0.87%Si, 0.29 0.41%Al,<0.035%S,<0.035%P, surplus Fe, when liquid steel temperature reaches 1,586 1609 DEG C, molten steel is come out of the stove to ladle, it is previously added multi-nary alloy particles in ladle, and containing calcium silicon barium zinc particle is added with stream in pouring molten steel, after casting is thermally treated and mechanical processing, the excellent high speed steel roll collar of availability, promoting and applying has good economic and social benefit.
Description
Technical field
The invention discloses a kind of high speed steel roll collar and preparation method thereof, more particularly to a kind of hot rolled seamless steel tube high speed
Steel rider ring and preparation method thereof belongs to steel tube fabrication technique field.
Background technology
Seamless steel pipe plays an important role in industrial and agricultural production with construction.Seamless steel pipe is made of block of metal
, non-jointed steel pipe, referred to as seamless steel pipe on surface.According to production method, seamless steel pipe divides hot-rolled pipe, cold rolled tube, cold
Tube drawing, extruded tube, push pipe etc..According to section configuration, two kinds of seamless steel pipe cyclotomy shape and abnormity, special pipe have it is rectangular, oval,
Triangle, hexagon, melon seeds shape, star, band finned tube Various Complex shape.Wherein hot rolled seamless steel tube be recrystallization temperature with
On the seamless steel pipe that is rolled.Seamless steel pipe is that hollow billet, then hot rolled, cold rolling is made with steel ingot or solid pipe billet perforated
Or cold group be made.
Hot rolled seamless steel tube has consequence in China's steel pipe industry, and the raw material of hot rolled seamless steel tube is circular pipe blank,
Circular pipe blank will pass through the blank for being cut into length and being about 1 meter of cutting machine, and communicated band is sent to heating in smelting furnace.Steel billet
It is admitted to heating in smelting furnace, temperature is about 1200 degrees Celsius.Circular pipe blank will carry out wearing sky after coming out of the stove by press piercing mill.One
As more typical punch be cone type piercer, this punch production efficiency is high, and good product quality, expanding amount of perforating is big,
Various steels can be worn.After perforation, circular pipe blank just successively by roller trio skew rolling, tandem rolling, extruding, will take off pipe sizing after extruding.Sizing mill
Enter the punching of steel embryo by taper bit high speed rotation, forms steel pipe.Pipe diameter is determined by the outer diameter length of sizing mill drill bit.
Steel pipe is after sizing, and into cooling tower, by water-spraying control, steel pipe is after cooling it is necessary to being straightened.Steel pipe after aligning by
Conveyer belt send to metal defect detection machine (or hydrostatic test) and carries out internal flaw detection.Wherein roller trio skew rolling is the key that hot rolled seamless steel tube
Process, collars are the main consumption spare parts during roller trio skew rolling.
In order to improve milling train production operational availability during roller trio skew rolling, the collars for developing high quality is extremely urgent.Middle promulgated by the State Council
Bright patent CN 104226919 discloses a kind of casting technique of period rolling mill roller, includes the following steps：1., installation mould
Tool；2., 15-25mm high temperature resistant molding sand is hung in the pass of mold, it is molding sand Chong is solid, and scrape roll pass circular arc, 24-48
Hour brushes the coating that 2-3mm zirconium silver powder is allocated again after drying in the shade, then dry into baking oven；3., for molten iron configure chemical composition, cast
After obtain roller blank；4., to roller blank roughing, then carry out high-temperature heat treatment；5., blank roll after heat treatment
Lower roll neck end face area slice does stretching and impact test, and the tensile strength and section for verifying roll roll toughness；6., meet the requirements after
It is axial to full roller, radial to be detected a flaw, detect metallographic process, finally roll and pass are finished.The roll of invention casting
Forging rolling toughness, wearability, the comprehensive performances such as heat resistanceheat resistant crack performance, be all significantly increased.Chinese utility model CN
204052362 disclose a kind of oblique milling roller arrangement of pipe mill, including work housing, are installed in the bearing on the work housing
There is oblique milling roller, safety device is installed at the oblique milling roller, workbench is connected between the oblique milling roller, the workbench is fixed
On work housing, two heads are connected with driving crank axis by connecting rod by driving crank axis on the oblique milling roller, described oblique
Two heads are made of several rolls on roll, and the axis of the oblique milling roller is in 120 ° of angle in vertical plane.The reality
It will not be cracked during steel pipe rolling with the oblique milling roller arrangement of novel pipe mill, to be broken, ensure roll
Working life, the final working efficiency for improving pipe mill, and safe and reliable during the work time.Chinese utility model
CN202290728 also discloses a kind of roll device of hot pipe mill.Mainly solves existing sizing roll device carrying energy
The problem that power is low, huge structure and occupied space are big.It is characterized in that：Three rolls (4) are separately fixed at drive shaft (2) and two
On a driven shaft (3), axis is mounted between drive shaft (3) and rack (1) and between two driven shafts (3) and rack (1)
It holds (5), each bevel gear (6) is separately mounted on drive shaft (2) and two driven shafts (3), the both ends point of drive shaft (2)
Not by 1 between two pairs of identical bevel gears (6) and two driven shafts (3)：1 transmits torque, and drive shaft (2) rotation drives two
Driven shaft (3) rotates synchronously, and makes three rolls (4) while being rotated to rolling in hole.The roll device of the hot pipe mill is not increasing
It is empty that the outer diameter of drive shaft and two driven shafts is increased while appearance and size, have compact-sized, bearing capacity high and is occupied
Between small feature.Chinese utility model CN201244575 also discloses a kind of roll profile of rotary rolling pipe mill, existing to solve
The problem that the roll shape operation of rolling is unstable, rolling accuracy is not high；The roll is in truncated cone, and roll centre is equipped with axis hole, rolls
The outer diameter D of roller larger diameter end ranging from 350~1300mm, length L ranging from 350~750mm, on the conical surface of the roll
Equipped with entrance circular angle area L1, approach cone area L2, wall-thickness reduction zone L3, Runout area L4, outlet cone area L5 and outlet fillet area L6；The practicality
The roll shape operation of rolling of novel offer is stable, rolling accident is few, and the expanding of steel pipe rolling process, sizing reduction can reach >=
15%；The effect of eccentricity≤(5~8) %, to improve the composite technology performance of existing oblique tube mill.Middle promulgated by the State Council
Bright patent CN86105420.2 disclose on tube slope rolling machine use tapered roller, from geometrically see tapered roller be two or two with
The assembly of the upper frustum of a cone.It is characterized in that its meridian (contour line) is folding linear.The new roller of the invention is characterized in
Its meridian is particular curve shape, is described by specific equation, and another feature of the invention is and metal deformation of rolled wire area
Space contacts everywhere, and the new roller of the invention is suitable for graceful being this graceful Mannesmann piercing machine, intersects punch (bacterium formula oblique milling
Machine), A Saier milling trains, the skew rolling mill of diesel pipe mill etc. is also suitable the transformation of these skew rolling mills.Chinese invention patent
CN87105039.0 also discloses a kind of roller for pipe-hot rolling mill with 3 rollers.The roller shape by sizing reduction section, wall-reducting section, expansion section, release
Put section, five part of round gauge section composition.It not only can acquire respective rollers shape by theoretical calculation formula according to actual needs, also can be
It is restructured on the basis of existing three-roll pipe mill roll, three-roll pipe mill is used for according to the roll of the new roll contour design of the invention
Group can compared with the three-high pipe mill designed at present according to process characteristics such as change feed angle, hole-lifting throat, reduction mill speeds
To reduce equipment investment, simplify device structure and rolling process, improves roll working life, product quality and milling train production
Rate, high financial profit.Chinese invention patent CN101239359 also disclose it is a kind of be made of mandrel, inner ring, outer shroud it is recyclable
The ring roller and manufacturing method utilized, in the axle body part of mandrel interference fit have by inner ring, outer shroud it is fused made of double gold
Belong to collars.It is 1600- using being put into heating in intermediate frequency furnace to be fused into temperature as the high-speed steel of outer shroud raw material or high nickel cast iron etc.
1650 DEG C of alloy molten steel, using the seamless steel pipe after cleaning or low-carbon cast steel pipe are preheating to 300-800 DEG C and put again as inner ring
Enter in sand mold, high temperature alloy molten steel is cast in sand mold to and is kept 1490-1540 DEG C of cast temperature, in solidification of molten steel mistake
Bimetallic collars is fused by outer shroud and inner ring in journey, is interference fitted into ring roller, structure with mandrel after thermally treated processing
Stablize, service life is long.
But the various collars generally existing hardness developed at present are low, wear no resistance and course of hot rolling in, collars
The deficiencies of being easily adhered to each other with seamless steel pipe seriously affects the presentation quality of seamless steel pipe.
Invention content
The present invention manufactures hot rolled seamless steel tube collars using high speed steel material, and seamless steel pipe is adhered to collars in order to prevent
Surface, the tiny graphite of original position diffusion-precipitation distribution, reduces the friction coefficient between collars and seamless steel pipe in collars.The present invention
It can be realized by following processing step.
A kind of preparation method of hot rolled seamless steel tube high speed steel roll collar, which is characterized in that include the following steps：
1. the first melting high-speed steel molten steel in medium-frequency induction furnace, and the chemical composition of high-speed steel molten steel and its quality are divided
Number is controlled in 3.22-3.45%C, 1.07-1.22%W, 2.39-2.61%Mo, 1.55-1.86%V, 12.44-12.67%Cr,
0.37-0.54%Mn, 0.63-0.87%Si, 0.29-0.41%Al,<0.035%S,<0.035%P, surplus Fe, when molten steel temperature
Degree is when reaching 1586-1609 DEG C, and molten steel is come out of the stove to ladle, and multi-nary alloy particles, multi-nary alloy particles are previously added in ladle
Size be 4-6mm, the chemical composition and its mass fraction of multi-nary alloy particles are 6.04~7.71%Ce, 6.15-7.48%
La, 10.10-11.29%Bi, 5.02-5.31%Sb, 3.54-4.25%Mg, 22.07-26.59%Si, surplus are Fe and can not
The addition of the trace impurity avoided, multi-nary alloy particles accounts for the 1.26-1.45% into steel quality score in ladle；
2. 1. the molten steel in ladle, when temperature is down to 1452-1475 DEG C, molten steel is poured into step after skimming, standing
Casting mold, and during pouring molten steel, high Si-Ca-Ba zinc alloy granules, high Si-Ca-Ba zinc alloy granules size are poured into steel flow
1-3mm, the chemical composition and its mass fraction of high Si-Ca-Ba zinc alloy granules are：60.14-63.78%Si, 5.07-5.53%
Ca, 5.52-5.80%Ba, 11.74-12.11%Zn ,≤0.50%C ,≤0.04%P ,≤0.06%S, surplus Fe, high silicon
The addition of calcium barium zinc alloying pellet accounts for the 2.63-2.88% into steel quality score in casting mold；
3. after pouring molten steel 1-2 hours, taking-up casting of unpacking obtains high speed steel roll collar blank after sand removal of polishing, high speed
After steel roll collar workblank roughing, high-temp antioxidizing paint is coated on its surface, paint thickness 0.50-0.80mm then will coating
There is the high speed steel roll collar blank of coating with stove heat to 1120-1135 DEG C, after heat preservation 2-2.5 hours, is furnace-cooled to temperature 1020-
1035 DEG C, after keeping the temperature 90-100 minutes, the quenching oil quenching for being 60-85 DEG C in temperature cools down 20-25 minutes, then will be at a high speed
Steel rider ring is with stove heat in 300-380 DEG C of stove to 580-595 DEG C in furnace temperature, and heating speed is 8 DEG C/20 minutes, keeps the temperature 5-6
Hour, it is then furnace-cooled to temperature and is less than 200 DEG C, continue collars with 30 DEG C/30 minutes speed with stove heat to 530-545
DEG C, after keeping the temperature 8-10 hours, it is furnace-cooled to temperature and is less than 120 DEG C, come out of the stove and be air-cooled to room temperature, be finally refined to predetermined size and essence
Degree, you can obtain hot rolled seamless steel tube high speed steel roll collar.
Hot rolled seamless steel tube high speed steel roll collar of the present invention, using melting molten steel in medium-frequency induction furnace, simple process is raw
It produces efficient.The chemical composition and its mass fraction of high-speed steel molten steel are controlled in 3.22-3.45%C, 1.07-1.22%W,
2.39-2.61%Mo, 1.55-1.86%V, 12.44-12.67%Cr, 0.37-0.54%Mn, 0.63-0.87%Si, 0.29-
0.41%Al,<0.035%S,<0.035%P, surplus Fe.1.07-1.22%W, 2.39-2.61%Mo is wherein added, mainly
Using in high-temperature heat treatment process, part tungsten and molybdenum fuse into matrix, can improve matrix high temperature hardness, are conducive to improve collars
High temperature abrasion resistance.1.55-1.86%V is added, it is carbide to be primarily due to vanadium, in process of setting, Yi Sheng
At the VC of high rigidity, be conducive to improve collars wearability.12.44-12.67%Cr is added, mainly utilizes chromium solid at high temperature
It is dissolved in matrix, in tempering, is conducive to disperse educt Cr23C6, matrix hardness is improved, collars wearability is improved.In addition, chromium is in height
Temperature is lower easily to form fine and close Cr2O3Protective film can reduce in the collars operation of rolling, the frictional force with steel tube surface, so as to
Reduce power consumption when steel rolling tube.0.37-0.54%Mn and 0.63-0.87%Si is added, pre-deoxidation can be taken to make molten steel
With.0.29-0.41%Al is added, other than the final deoxidizing for playing molten steel, aluminium is non-carbide former, is solid-solution in base
Body promotes easily occur pearlite and ferrite in as-cast structure, so as to improve the processing performance of as cast condition high speed steel roll collar, Ke Yiwu
Need to anneal direct roughing, reduce energy consumption, and the high speed steel roll collar production cycle shortened.In addition the addition of aluminium also easily generates
Fine and close Al2O3Protective film can prevent the continued oxidation during high speed steel roll collar use.
In addition, the present invention is when liquid steel temperature reaches 1586-1609 DEG C, molten steel is come out of the stove to ladle, in ladle in advance plus
Enter multi-nary alloy particles, the size of multi-nary alloy particles is 4-6mm, and the chemical composition and its mass fraction of multi-nary alloy particles are
6.04~7.71%Ce, 6.15-7.48%La, 10.10-11.29%Bi, 5.02-5.31%Sb, 3.54-4.25%Mg,
22.07-26.59%Si, surplus are Fe and inevitable trace impurity, and the addition of multi-nary alloy particles is accounted for into ladle
The 1.26-1.45% of steel quality score.The main purpose of multi-nary alloy particles is added, mainly utilizes in multi-nary alloy particles
6.04~7.71%Ce, 6.15-7.48%La carry out desulfurization, deoxidation, and thinning solidification structure contains in multi-nary alloy particles
3.54-4.25%Mg has the function of promoting eutectic carbide fracture and realizes the growth of eutectic carbide isolation, is conducive to carry
The intensity and toughness of high high speed steel roll collar.10.10-11.29%Bi and 5.02-5.31%Sb in multi-nary alloy particles, mainly
Because when Sb and Bi coexists in appropriate proportions with rare earth element, variation graphite can be eliminated, graphite form can be effectively improved, increased
Number of graphite ball reduces or eliminates the variation graphite of collars center portion.Molten steel is after skimming, standing, when temperature is down to 1452-1475 DEG C
When, molten steel is poured into casting mold, and during pouring molten steel, high Si-Ca-Ba zinc alloy granules, high Si-Ca-Ba are poured into steel flow
Zinc alloy granules size 1-3mm, the chemical composition and its mass fraction of high Si-Ca-Ba zinc alloy granules are：60.14-63.78%
Si, 5.07-5.53%Ca, 5.52-5.80%Ba, 11.74-12.11%Zn ,≤0.50%C ,≤0.04%P ,≤0.06%S,
Surplus is Fe, and the addition of high Si-Ca-Ba zinc alloy granules accounts for the 2.63-2.88% into steel quality score in casting mold.It is added
The main function of high Si-Ca-Ba zinc alloy granules is to promote that tiny graphite is precipitated in collars process of setting.In addition, high silico-calcium barium zinc
The addition of alloying pellet can also further refining eutectic carbide, be conducive to further increase collars obdurability.Pouring molten steel
It after 1-2 hours, unpacks and takes out casting, after sand removal of polishing, obtain high speed steel roll collar blank, high speed steel roll collar blank directly slightly adds
After work, common high-temp antioxidizing paint is coated on its surface, paint thickness 0.50-0.80mm can prevent collars to be heated at high temperature
Severe oxidation and decarburization occurs when with heat preservation.Then the high speed steel roll collar blank of coating is coated with stove heat to 1120-
1135 DEG C, after keeping the temperature 2-2.5 hours, primarily to promoting the further precipitation of graphite.Furnace cooling is needed after heat preservation, because
1120-1135 DEG C of direct quenching, the alloying element being dissolved in austenite under high temperature is too many, and a large amount of residuals are will appear in quenching structure
Austenite will be greatly reduced collars hardness and wearability.After soak processing, need to be furnace-cooled to 1020-1035 DEG C of temperature,
After heat preservation 90-100 minutes, the quenching oil quenching for being 60-85 DEG C in temperature cools down 20-25 minutes, primarily to obtaining high
The martensitic matrix of hardness.It is then with stove heat in 300-380 DEG C of stove to 580-595 DEG C in furnace temperature by high speed steel roll collar,
Heating speed is 8 DEG C/20 minutes, keeps the temperature 5-6 hours, is chiefly to facilitate the decomposition of retained austenite, and collars performance is promoted to stablize.
It is then furnace-cooled to temperature and is less than 200 DEG C, continue collars with 30 DEG C/30 minutes speed with stove heat to 530-545 DEG C, heat preservation
It after 8-10 hours, is furnace-cooled to temperature and is less than 120 DEG C, come out of the stove and be air-cooled to room temperature, primarily to eliminating collars internal stress, stabilizing roller
Ring tissue, it is ensured that collars is used safely.Finally it is refined to predetermined size and precision, you can obtain hot rolled seamless steel tube high speed
Steel rider ring.
Compared with prior art, the present invention haing the following advantages.
1) high speed steel roll collar of the present invention has lower be produced into without expensive alloying elements such as niobium, cobalt, nickel
This；
2) high speed steel roll collar of the present invention has poured into high Si-Ca-Ba zinc alloy granules during pouring molten steel with steel flow,
Promote indigenous graphite in collars as-cast structure, in high-temperature heat treatment process, so that Graphite Precipitation amount is further increased, microscopic structure
The percentage by volume of middle graphite reaches 6.3-6.7%, it is ensured that steel bonding phenomenon will not occur when high speed steel roll collar rolling seamless steel pipe；
3) high speed steel roll collar hardness of the present invention is more than 82HSD, and impact flexibility is more than 25J/cm2, and tensile strength is more than
1550Mpa has excellent using effect, is used on hot rolled seamless steel tube milling train, and high speed steel roll collar of the present invention uses the longevity
Life improves 5 times or more than high nickel chromium triangle infinitely chilled ductile cast iron collars, and production cost only improves 30% or so, and promoting and applying has well
Economic and social benefit.
Description of the drawings
Fig. 1 is the picture of indigenous graphite in the high speed steel roll collar that present invention design example 1 obtains.
Specific implementation mode
The present invention is further described with reference to embodiments, but the present invention is not limited to following embodiments.Height used
Warm antioxidizing paint is the antioxidizing paint of routine, as (Huangyan, Zhejiang spy applies the limited public affairs of new material for Huangyan, Zhejiang sapecial coating factory
Department) 202 high temperature anti-oxidation coatings of production, the RLHY-33 shaped steel iron heating of Beijing Rong Li Heng Ye Science and Technology Ltd.s production be anti-
Oxidation coating.
Embodiment 1：
Hot rolled seamless steel tube high speed steel roll collar and preparation method thereof, feature are molten using 500 kilograms of medium-frequency induction furnaces
Refining, specific step of preparation process come as follows：
1. the first melting high-speed steel molten steel in medium-frequency induction furnace, and the chemical composition of high-speed steel molten steel and its quality are divided
Number control is in 3.22%C, 1.22%W, 2.39%Mo, 1.86%V, 12.44%Cr, 0.37%Mn, 0.87%Si, 0.29%
Al, 0.032%S, 0.034%P, surplus Fe comes out of the stove molten steel to ladle when liquid steel temperature reaches 1586 DEG C, pre- in ladle
Multi-nary alloy particles are first added, the size of multi-nary alloy particles is 4-6mm, the chemical composition and its quality point of multi-nary alloy particles
Number is 6.04%Ce, 7.48%La, 10.10%Bi, 5.31%Sb, 3.54%Mg, 26.59%Si, and surplus is Fe and can not keep away
The addition of the trace impurity exempted from, multi-nary alloy particles accounts for 1.26% into steel quality score in ladle；
1. 2. molten steel, when temperature is down to 1452 DEG C, is poured into casting mold to step by the molten steel in ladle after skimming, standing,
And during pouring molten steel, high Si-Ca-Ba zinc alloy granules, high Si-Ca-Ba zinc alloy granules size 1- are poured into steel flow
3mm, the chemical composition and its mass fraction of high Si-Ca-Ba zinc alloy granules are：60.14%Si, 5.53%Ca, 5.52%Ba,
12.11%Zn, 0.39%C, 0.033%P, 0.047%S, surplus Fe, the addition of high Si-Ca-Ba zinc alloy granules account for entrance
The 2.63% of steel quality score in casting mold；
3. after pouring molten steel 1 hour, taking-up casting of unpacking obtains high speed steel roll collar blank, high-speed steel after sand removal of polishing
After roll collar workblank roughing, high-temp antioxidizing paint is coated on its surface, then paint thickness 0.50mm is coated with coating
High speed steel roll collar blank, to 1120 DEG C, after keeping the temperature 2.5 hours, is furnace-cooled to 1020 DEG C of temperature with stove heat, after keeping the temperature 100 minutes,
The quenching oil quenching for being 60 DEG C in temperature cools down 25 minutes, then by high speed steel roll collar in the stove that furnace temperature is 300-330 DEG C
With stove heat to 595 DEG C, heating speed is 8 DEG C/20 minutes, keeps the temperature 6 hours, is then furnace-cooled to temperature and is less than 200 DEG C, continue by
Collars with 30 DEG C/30 minutes speed with stove heat to 545 DEG C, heat preservation 8 hours after, be furnace-cooled to temperature be less than 120 DEG C, sky of coming out of the stove
It is cooled to room temperature, is finally refined to predetermined size and precision, you can obtains hot rolled seamless steel tube high speed steel roll collar, mechanical property
1 can be shown in Table.
Embodiment 2：
Hot rolled seamless steel tube high speed steel roll collar and preparation method thereof, feature are molten using 1000 kilograms of medium-frequency induction furnaces
Refining, specific step of preparation process come as follows：
1. the first melting high-speed steel molten steel in medium-frequency induction furnace, and the chemical composition of high-speed steel molten steel and its quality are divided
Number control is in 3.45%C, 1.07%W, 2.61%Mo, 1.55%V, 12.67%Cr, 0.54%Mn, 0.63%Si, 0.41%
Al, 0.028%S, 0.033%P, surplus Fe comes out of the stove molten steel to ladle when liquid steel temperature reaches 1609 DEG C, pre- in ladle
Multi-nary alloy particles are first added, the size of multi-nary alloy particles is 4-6mm, the chemical composition and its quality point of multi-nary alloy particles
Number is 7.71%Ce, 6.15%La, 11.29%Bi, 5.02%Sb, 4.25%Mg, 22.07%Si, and surplus is Fe and can not keep away
The addition of the trace impurity exempted from, multi-nary alloy particles accounts for 1.45% into steel quality score in ladle；
1. 2. molten steel, when temperature is down to 1475 DEG C, is poured into casting mold to step by the molten steel in ladle after skimming, standing,
And during pouring molten steel, high Si-Ca-Ba zinc alloy granules, high Si-Ca-Ba zinc alloy granules size 1- are poured into steel flow
3mm, the chemical composition and its mass fraction of high Si-Ca-Ba zinc alloy granules are：63.78%Si, 5.07%Ca, 5.80%Ba,
11.74%Zn, 0.45%C, 0.037%P, 0.041%S, surplus Fe, the addition of high Si-Ca-Ba zinc alloy granules account for entrance
The 2.88% of steel quality score in casting mold；
3. after pouring molten steel 2 hours, taking-up casting of unpacking obtains high speed steel roll collar blank, high-speed steel after sand removal of polishing
After roll collar workblank roughing, high-temp antioxidizing paint is coated on its surface, then paint thickness 0.80mm is coated with coating
High speed steel roll collar blank, to 1135 DEG C, after keeping the temperature 2 hours, is furnace-cooled to 1035 DEG C of temperature, after keeping the temperature 90 minutes, in temperature with stove heat
Degree cools down 20 minutes for 85 DEG C of quenching oil quenching, is then in 350-380 DEG C of stove with stove in furnace temperature by high speed steel roll collar
580 DEG C are heated to, heating speed is 8 DEG C/20 minutes, keeps the temperature 5 hours, is then furnace-cooled to temperature and is less than 200 DEG C, continues collars
With 30 DEG C/30 minutes speed with stove heat to 530 DEG C, after keeping the temperature 10 hours, it is furnace-cooled to temperature and is less than 120 DEG C, come out of the stove air-cooled
To room temperature, it is finally refined to predetermined size and precision, you can obtain hot rolled seamless steel tube high speed steel roll collar, mechanical property
It is shown in Table 1.
Embodiment 3：
Hot rolled seamless steel tube high speed steel roll collar and preparation method thereof, feature are molten using 1500 kilograms of medium-frequency induction furnaces
Refining, specific step of preparation process come as follows：
1. the first melting high-speed steel molten steel in medium-frequency induction furnace, and the chemical composition of high-speed steel molten steel and its quality are divided
Number control is in 3.37%C, 1.17%W, 2.48%Mo, 1.69%V, 12.50%Cr, 0.46%Mn, 0.69%Si, 0.35%
Al, 0.031%S, 0.025%P, surplus Fe comes out of the stove molten steel to ladle when liquid steel temperature reaches 1597 DEG C, pre- in ladle
Multi-nary alloy particles are first added, the size of multi-nary alloy particles is 4-6mm, the chemical composition and its quality point of multi-nary alloy particles
Number is 6.93%Ce, 6.84%La, 10.79%Bi, 5.08%Sb, 3.74%Mg, 24.06%Si, and surplus is Fe and can not keep away
The addition of the trace impurity exempted from, multi-nary alloy particles accounts for 1.30% into steel quality score in ladle；
1. 2. molten steel, when temperature is down to 1461 DEG C, is poured into casting mold to step by the molten steel in ladle after skimming, standing,
And during pouring molten steel, high Si-Ca-Ba zinc alloy granules, high Si-Ca-Ba zinc alloy granules size 1- are poured into steel flow
3mm, the chemical composition and its mass fraction of high Si-Ca-Ba zinc alloy granules are：62.53%Si, 5.36%Ca, 5.72%Ba,
11.95%Zn, 0.27%C, 0.029%P, 0.051%S, surplus Fe, the addition of high Si-Ca-Ba zinc alloy granules account for entrance
The 2.70% of steel quality score in casting mold；
3. after pouring molten steel 1.5 hours, taking-up casting of unpacking obtains high speed steel roll collar blank after sand removal of polishing, high speed
After steel roll collar workblank roughing, high-temp antioxidizing paint is coated on its surface, then paint thickness 0.65mm is coated with coating
High speed steel roll collar blank with stove heat to 1130 DEG C, after heat preservation 2.5 hours, be furnace-cooled to 1030 DEG C of temperature, after heat preservation 90 minutes,
The quenching oil quenching for being 74 DEG C in temperature cools down 23 minutes, then by high speed steel roll collar in the stove that furnace temperature is 330-365 DEG C
With stove heat to 585 DEG C, heating speed is 8 DEG C/20 minutes, keeps the temperature 6 hours, is then furnace-cooled to temperature and is less than 200 DEG C, continue by
Collars with 30 DEG C/30 minutes speed with stove heat to 540 DEG C, heat preservation 9 hours after, be furnace-cooled to temperature be less than 120 DEG C, sky of coming out of the stove
It is cooled to room temperature, is finally refined to predetermined size and precision, you can obtains hot rolled seamless steel tube high speed steel roll collar, mechanical property
1 can be shown in Table.
Table 1 hot rolled seamless steel tube high speed steel roll collar mechanical property
| Mechanical property | Hardness/HSD | Impact flexibility/J.cm-2 | Tensile strength/MPa |
| Embodiment 1 | 82.7 | 26.1 | 1570 |
| Embodiment 2 | 82.4 | 25.8 | 1625 |
| Embodiment 3 | 83.2 | 26.9 | 1610 |
The picture that the present invention designs indigenous graphite in the high speed steel roll collar that example 1 obtains is shown in Fig. 1, and embodiment 2 and 3 is similarly
Obtain the picture of the graphite of Fig. 1 precipitations.
High speed steel roll collar of the present invention has lower production cost without expensive alloying elements such as niobium, cobalt, nickel.
High speed steel roll collar of the present invention has poured into high Si-Ca-Ba zinc alloy granules during pouring molten steel, with steel flow, promotes as cast condition group
Middle indigenous graphite is knitted, in high-temperature heat treatment process, Graphite Precipitation amount is made to further increase, the volume hundred of graphite in microscopic structure
Score reaches 6.3-6.7%, it is ensured that steel bonding phenomenon will not occur when high speed steel roll collar rolling seamless steel pipe.High speed steel rider of the present invention
Ring hardness is more than 82HSD, and impact flexibility is more than 25J/cm2, tensile strength be more than 1550MPa, have excellent using effect,
It is used on hot rolled seamless steel tube milling train, the service life of high speed steel roll collar of the present invention is improved than high nickel chromium triangle infinitely chilled ductile cast iron collars
5 times or more, production cost only improves 30% or so, promotes and applies high speed steel roll collar of the present invention, can improve pipe mill operating rate,
Mitigate labor intensity, improve steel tube surface quality, reduce steel pipe's production cost, there is good economic and social benefit.
Claims (2)
1. a kind of preparation method of hot rolled seamless steel tube high speed steel roll collar, which is characterized in that include the following steps：
1. the first melting high-speed steel molten steel in medium-frequency induction furnace, and by the chemical composition of high-speed steel molten steel and its mass fraction control
It makes in 3.22-3.45%C, 1.07-1.22%W, 2.39-2.61%Mo, 1.55-1.86%V, 12.44-12.67%Cr,
0.37-0.54%Mn, 0.63-0.87%Si, 0.29-0.41%Al,<0.035%S,<0.035%P, surplus Fe, when molten steel temperature
Degree is when reaching 1586-1609 DEG C, and molten steel is come out of the stove to ladle, and multi-nary alloy particles, multi-nary alloy particles are previously added in ladle
Size be 4-6mm, the chemical composition and its mass fraction of multi-nary alloy particles are 6.04~7.71%Ce, 6.15-7.48%
La, 10.10-11.29%Bi, 5.02-5.31%Sb, 3.54-4.25%Mg, 22.07-26.59%Si, surplus are Fe and can not
The addition of the trace impurity avoided, multi-nary alloy particles accounts for the 1.26-1.45% into steel quality score in ladle；
1. 2. molten steel, when temperature is down to 1452-1475 DEG C, is poured into casting mold to step by the molten steel in ladle after skimming, standing,
And during pouring molten steel, high Si-Ca-Ba zinc alloy granules, high Si-Ca-Ba zinc alloy granules size 1- are poured into steel flow
3mm, the chemical composition and its mass fraction of high Si-Ca-Ba zinc alloy granules are：60.14-63.78%Si, 5.07-5.53%Ca,
5.52-5.80%Ba, 11.74-12.11%Zn ,≤0.50%C ,≤0.04%P ,≤0.06%S, surplus Fe, high Si-Ca-Ba
The addition of zinc alloy granules accounts for the 2.63-2.88% into steel quality score in casting mold；
3. after pouring molten steel 1-2 hours, taking-up casting of unpacking obtains high speed steel roll collar blank, high speed steel rider after sand removal of polishing
Ring blank coats high-temp antioxidizing paint after roughing, on its surface, then paint thickness 0.50-0.80mm is coated with
The high speed steel roll collar blank of coating, to 1120-1135 DEG C, after keeping the temperature 2-2.5 hours, is furnace-cooled to temperature 1020-1035 with stove heat
DEG C, after keeping the temperature 90-100 minutes, the quenching oil quenching for being 60-85 DEG C in temperature cools down 20-25 minutes, then by high speed steel rider
Ring is with stove heat in 300-380 DEG C of stove to 580-595 DEG C in furnace temperature, and heating speed is 8 DEG C/20 minutes, and heat preservation 5-6 is small
When, it is then furnace-cooled to temperature and is less than 200 DEG C, continue collars with 30 DEG C/30 minutes speed with stove heat to 530-545 DEG C,
After heat preservation 8-10 hours, it is furnace-cooled to temperature and is less than 120 DEG C, come out of the stove and be air-cooled to room temperature, be finally refined to predetermined size and precision,
It can be obtained hot rolled seamless steel tube high speed steel roll collar.
2. the hot rolled seamless steel tube high speed steel roll collar being prepared according to the method for claim 1.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109482654A (en) * | 2018-11-23 | 2019-03-19 | 枣庄瑞兴机械制造有限公司 | For Kocks milling train composite ring and its manufacturing method |
| CN110000362A (en) * | 2019-04-10 | 2019-07-12 | 安徽环渤湾高速钢轧辊有限公司 | A kind of high tungsten vanadium high-speed steel abrasion-resistant roller and its manufacturing method |
| CN111809105A (en) * | 2020-07-22 | 2020-10-23 | 枣庄光研工业科技有限公司 | In-situ composite carbide particle reinforced wear-resistant roller and preparation method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1264749A (en) * | 2000-03-24 | 2000-08-30 | 冶金工业部钢铁研究总院 | High-speed antiwear cast steel |
| CN1424423A (en) * | 2002-12-24 | 2003-06-18 | 西安交通大学 | High-speed steel roll ring and its production |
| CN1693527A (en) * | 2005-05-10 | 2005-11-09 | 酒泉钢铁(集团)有限责任公司 | Cobalt less multi element high speed tool steel and its manufacturing method |
| CN101078090A (en) * | 2007-06-26 | 2007-11-28 | 郑州航空工业管理学院 | Low-alloy high speed steel roll material and preparation method thereof |
| CN101805869A (en) * | 2010-04-16 | 2010-08-18 | 北京工业大学 | Boron-contained high-chromium high-speed steel roller material and heat treatment method thereof |
| CN102409267A (en) * | 2011-11-14 | 2012-04-11 | 北京工业大学 | Boron-containing high speed steel roller and preparation method thereof |
| CN102703822A (en) * | 2012-01-19 | 2012-10-03 | 刘仕爽 | Preparation method of high-speed steel for composite roll collar |
| CN103624084A (en) * | 2013-11-20 | 2014-03-12 | 枣庄瑞兴机械制造有限公司 | Resource-saving type high-boron high-speed steel composite roll and manufacturing method thereof |
-
2018
- 2018-05-31 CN CN201810552806.XA patent/CN108660361B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1264749A (en) * | 2000-03-24 | 2000-08-30 | 冶金工业部钢铁研究总院 | High-speed antiwear cast steel |
| CN1424423A (en) * | 2002-12-24 | 2003-06-18 | 西安交通大学 | High-speed steel roll ring and its production |
| CN1693527A (en) * | 2005-05-10 | 2005-11-09 | 酒泉钢铁(集团)有限责任公司 | Cobalt less multi element high speed tool steel and its manufacturing method |
| CN101078090A (en) * | 2007-06-26 | 2007-11-28 | 郑州航空工业管理学院 | Low-alloy high speed steel roll material and preparation method thereof |
| CN101805869A (en) * | 2010-04-16 | 2010-08-18 | 北京工业大学 | Boron-contained high-chromium high-speed steel roller material and heat treatment method thereof |
| CN102409267A (en) * | 2011-11-14 | 2012-04-11 | 北京工业大学 | Boron-containing high speed steel roller and preparation method thereof |
| CN102703822A (en) * | 2012-01-19 | 2012-10-03 | 刘仕爽 | Preparation method of high-speed steel for composite roll collar |
| CN103624084A (en) * | 2013-11-20 | 2014-03-12 | 枣庄瑞兴机械制造有限公司 | Resource-saving type high-boron high-speed steel composite roll and manufacturing method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109482654A (en) * | 2018-11-23 | 2019-03-19 | 枣庄瑞兴机械制造有限公司 | For Kocks milling train composite ring and its manufacturing method |
| CN109482654B (en) * | 2018-11-23 | 2020-04-28 | 枣庄瑞兴机械制造有限公司 | Composite roll collar for Kocks rolling mill and manufacturing method thereof |
| CN110000362A (en) * | 2019-04-10 | 2019-07-12 | 安徽环渤湾高速钢轧辊有限公司 | A kind of high tungsten vanadium high-speed steel abrasion-resistant roller and its manufacturing method |
| CN110000362B (en) * | 2019-04-10 | 2021-01-01 | 安徽环渤湾高速钢轧辊有限公司 | High-tungsten-vanadium high-speed steel wear-resistant roller and manufacturing method thereof |
| CN111809105A (en) * | 2020-07-22 | 2020-10-23 | 枣庄光研工业科技有限公司 | In-situ composite carbide particle reinforced wear-resistant roller and preparation method thereof |
| CN111809105B (en) * | 2020-07-22 | 2021-06-25 | 枣庄光研工业科技有限公司 | In-situ composite carbide particle reinforced wear-resistant roller and preparation method thereof |
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Denomination of invention: High speed steel roll ring for hot rolled seamless steel pipe and its preparation method Effective date of registration: 20221124 Granted publication date: 20200515 Pledgee: Tongling Wanjiang Rural Commercial Bank Co.,Ltd. Jinghu Sub branch Pledgor: ANHUI HUANBOWAN HIGH SPEED STEEL MILL ROLL Co.,Ltd. Registration number: Y2022980023428 |