CN106269869A - A kind of production method of Valve Steel 53Cr21Mn9Ni4N polishing bar - Google Patents
A kind of production method of Valve Steel 53Cr21Mn9Ni4N polishing bar Download PDFInfo
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- CN106269869A CN106269869A CN201610722947.2A CN201610722947A CN106269869A CN 106269869 A CN106269869 A CN 106269869A CN 201610722947 A CN201610722947 A CN 201610722947A CN 106269869 A CN106269869 A CN 106269869A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/46—Roll speed or drive motor control
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- 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
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
- B21C37/042—Manufacture of coated wire or bars
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
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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
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- 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
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
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- Heat Treatment Of Steel (AREA)
- Continuous Casting (AREA)
Abstract
The present invention proposes the production method of a kind of Valve Steel 53Cr21Mn9Ni4N polishing bar, that includes the smelting of Valve Steel, continuous casting, high speed wire rolling, be heat-treated to the complete procedure of finished product, its technological process is: electric furnace smelting → external refining → continuous casting → heating → high-speed wire rolling → heat treatment (off-line type/online two kinds) → aligning → polishing → inspection → warehouse-in.The production method of the present invention uses the pouring type of continuous casting, overcome the feature that 53Cr21Mn9Ni4N high-temp plastic is poor, resistance of deformation is difficult to greatly continuous casting, direct continuous casting billet rolls, and greatly reduces the materials processing loss in this link and energy consumption, improves the lumber recovery of blank；Have employed continuous casting billet direct high-speed rod precision rolling technology, improve production efficiency, mill product wire rod dimension control is also greatly improved, it is achieved that " one-heating forming " of 53Cr21Mn9Ni4N steel continuous casting billet Direct Rolling to wire rod；And heat treatment achieves off-line and online two ways, can require to carry out unrestricted choice according to Customer Quality.
Description
Technical field
The present invention relates to smelting iron and steel technical field, be specifically related to the polishing bar of a kind of Valve Steel 53Cr21Mn9Ni4N
Production method.
Background technology
Valve Steel 53Cr21Mn9Ni4N is the one in GB GB/T12773-2008 in austenite Valve Steel, referred to as
21-4N, contains following component: C:0.48～0.58% with weight percentage；Si :≤0.35%；Mn:8.00～10.00%；P:
≤ 0.040%；S≤0.030%；Ni:3.25～4.50%；Cr:20.00～22.00%；N:0.35～0.50%；Cu :≤
0.30%；C+N >=0.90%.
The austenitic heat-resistance steel that 53Cr21Mn9Ni4N steel is is precipitation-hardening phase with carbide, this steel grade poor thermal conductivity, heat
Swollen coefficient is big, and resistance of deformation is big, and the general austenitic heat-resistance steel of plasticity ratio is poor, belongs to austenaging steel, the most often incorporates in difficulty
Deformation steel grade, production difficulty is big.Because it contains higher manganese, nickel, carbon, nitrogen and chromium, there is austenitic microstructure and high knot
Brilliant temperature, thus there is high elevated temperature strength, improving heat-proof corrosion-resistant performance, high manganese content and chrome content make steel at room temperature
There is austenite structure；Higher carbon, nitrogen content, produce stronger precipitation-hardening effect, enhances intensity, hardness and wear-resisting
Property.It is generally used in the middling speed of 850 DEG C of work, load engine high-power, middle, at home and abroad car exhaust valve has obtained wide
General application.
The characteristic that 53Cr21Mn9Ni4N Valve Steel has due to it, the production procedure of its metallic article bar the most domestic
Generally: electric furnace smelting → external refining → molding → reconditioning → heating → cogging (rolling cogging or forging cogging) → peeling or reconditioning
Process → heating → rolling → heat treatment → aligning → polishing → inspection → warehouse-in.53Cr21Mn9Ni4N product quality requires tight
Lattice, its production process is complicated, takes rolling or hammer cogging, and the phenomenons such as heating reconditioning loss is big, cracking take place frequently, and cause into
Material rate is low, particularly crackle occurs in hot-working, and always manufacturer pays close attention to and stubborn problem, for small dimension
Valve Steel, dimensional tolerance, dimension control difficulty are bigger.Factors above directly results in Valve Steel 53Cr21Mn9Ni4N
Product rate is low, affects the economic benefit of manufacturing enterprise.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of production technology new for Valve Steel 53Cr21Mn9Ni4N, improve raw
Produce efficiency, mill product wire rod dimension control is also greatly improved, and overcome 53Cr21Mn9Ni4N high-temp plastic poor, change
Shape drag is difficult to greatly the feature of continuous casting.
To achieve the object of the present invention, the production method of a kind of Valve Steel 53Cr21Mn9Ni4N polishing bar of the present invention
Comprise the following steps:
S1: allocate steel scrap and high carbon ferro-chrome, nickel iron alloys material in electric arc furnace into, carries out melting and just refines, and tapping temperature >=
1600 DEG C, P≤0.040%；
S2:AOD smelts, and the nitrogen flushing heat of oxidation is smelted with oxygen, when temperature reaches >=1660 DEG C, during C≤0.60%, is initially added into
Ferrosilicon amount restoring operation, nitrogen blowing alloying, adjust alloying component；When composition meets standard-required, go out during temperature T >=1490 DEG C
Steel, turns LF refine；
S3:LF refine, finely tunes composition, temperature, keeps white slag operation, after molten steel temperature reaches continuous casting bull ladle temperature
Tapping；
S4: billet caster continuous casting, bull ladle temperature is: continuous casting first wraps 1490～1510 DEG C, even bag 1480～1500 DEG C；
In casting cycle, superheat of liquid steel controls between 25～35 DEG C, during cast, uses the combination of crystallizer and end electromagnetic agitation
Mode；During ejection, mark carried out by continuous casting billet, and air cooling is stacked；
S5: roll front heating, heats in pusher-type furnace or walking beam furnace；
S6: high-speed wire rolling, start rolling temperature: 1160～1190 DEG C, finish to gauge laying temperature controls >=1050 DEG C, after weaving silk
Water spray is used to force cooling；Enter after cooling and collect volume, carry out packing and transporting after collection and enter heat treatment step；
S7: heat treatment；
S8: aligning, after 53Cr21Mn9Ni4N wire rod heat treatment, immerses wire rod in Calx coating solution and keeps a moment,
Pull-out, natural drying, it is dried with face coat, turning white is as the criterion；Wire rod uses seven roller straighteners to align, linearity≤1mm/
m；And
S9: polishing, uses centerless grinder processing, first roughly grinds, and then carries out fine grinding and reaches to design requirement.
Preferably, in step s 4, temperature during cast is 1415-1430 DEG C, and pulling rate is 1.3-1.0m/min.
Further preferably, in step s 4, cooling control mode is the mode that two cold-zones use syllogic subregion water distribution, when drawing
When speed is less than 1.0m/min, two three sections, cold-zone water are all turned on, and the ratio of the water distribution quantity of three sections of water is 50%:30%:20%；Ratio
The water yield is along with pulling rate Auto-matching；During normal pulling rate scope 1.0～1.2m/min, front two sections of water yields are only opened in two cold-zones, its
Allocation proportion is 55%:45%, and it is 0.27～0.32L/Kg steel that total specific water controls.
Further preferably, in step s 5, continuous casting square billet heating and temperature control is: preheating section≤1050 DEG C；Bringing-up section: 1030
～1080 DEG C；Soaking zone: 1170～1210 DEG C.
Further preferably, in described step S6, the speed controlling of wire rod rolling is: rolling outlet section mill speed in one is 1.10
～1.15m/s；Pre-finish rolling outlet section speed is 4.78～5.64m/s, and outlet finishing speeds is 28～33m/s.
Further preferably, the heat treatment of described step S7 is divided into off-line type heat treatment and online heat treatment, wherein said from
Wire type heat treatment method is: by the solution treatment of 53Cr21Mn9Ni4N hot rolling dish unit, solid solubility temperature 1040-1150 DEG C, time 30-
60min；The type of cooling: water-cooled；Grain size controls requirement and is narrower than 6 grades, and sample end hardness is 32～37HRC；Described online
Heat treatment method is: rolled through fast mill by 53Cr21Mn9Ni4N continuous casting billet, and rolling heating technique need to meet step 5 and be chatted
The requirement stated, wire rod uses burning optimization on line mode after weaving silk, and i.e. enters water cooling, and grain size controls requirement and is narrower than 8 grades, sample
End hardness is 31～36HRC.
Comparing with existing production technology, the present invention has the following advantages:
(1) use the pouring type of continuous casting, overcome that 53Cr21Mn9Ni4N high-temp plastic is poor, resistance of deformation is difficult to greatly company
The feature of casting, instead of in original production procedure " at molding → reconditioning → cogging (roll cogging or forge cogging) → peeling or reconditioning
Reason-heating " link (technique i.e. molding base breaking down cogging), directly roll with continuous casting billet, greatly reduce in this link
Materials processing loss and energy consumption, improve the lumber recovery of blank；
(2) have employed continuous casting billet direct high-speed rod precision rolling technology, improve production efficiency, mill product wire rod chi
Very little precision controlling is also greatly improved, it is achieved that " one-heating forming " of 53Cr21Mn9Ni4N steel continuous casting billet Direct Rolling to wire rod；
(3) heat treatment achieves off-line and online two ways, can require to carry out unrestricted choice according to Customer Quality.
Accompanying drawing explanation
By detailed description below in conjunction with the accompanying drawings, the aforesaid objects, features and advantages with other of the present invention will become
Obviously.Wherein:
Fig. 1 show the production method schematic flow sheet of the Valve Steel 53Cr21Mn9Ni4N polishing bar of the present invention.
Detailed description of the invention
With reference to the production method schematic flow sheet of the Valve Steel 53Cr21Mn9Ni4N polishing bar of the present invention shown in Fig. 1,
Its technological process of production is summarised as: electric furnace smelting → external refining → continuous casting → heating → high-speed wire rolling → heat treatment (from
Wire type/online two kinds) → aligning → polishing → inspection → warehouse-in；That includes the smelting of Valve Steel 53Cr21Mn9Ni4N, company
Casting, high speed wire rolling, it is heat-treated to the complete production method of finished product.Describe the producer of the present invention in conjunction with specific embodiments in detail
Method is as follows.
Embodiment one
The wire rod specification producing a stove 53Cr21Mn9Ni4N is φ 6.7mm product.Its technological process of production is as follows: 25t electricity
Stove smelting → 25tAOD smelting → 25tLF refine → two stream 150 × 150mm section continuous small-billet casting → heating → high-speed rod rolls
System → off-line type heat treatment → align → polish → check qualified → finished product warehouse-in.Concrete production stage is as follows:
The first step: allocate steel scrap and high carbon ferro-chrome, nickel iron alloys material in electric arc furnace into, carries out melting just refining.Tapping temperature
Degree is 1620 DEG C, P:0.030%；
Second step: AOD smelts, and the nitrogen flushing heat of oxidation is smelted with oxygen, when temperature reaches >=1660 DEG C, when C≤0.60%, opens
Begin to add ferrosilicon amount restoring operation, nitrogen blowing alloying, adjust alloy.When composition meets standard-required, during temperature T >=1490 DEG C
Tapping, turns LF (LADLE FURNACE, i.e. ladle refining furnace) refine；
3rd step: LF refine, finely tunes composition, temperature, keeps white slag operation, after molten steel temperature reaches continuous casting bull ladle temperature
Can tap.Tapping molten steel composition is: C:0.54%；Si:0.31%；Mn:8.53%；P:0.028%；S:0.007%；Ni:
3.76%；Cr:21.80%；N:0.39%；Tapping soft blow stands bull ladle after 10min；
4th step: continuous casting bull ladle temperature is 1507 DEG C, during cast, uses the combination side of crystallizer and end electromagnetic agitation
Formula, M-EMS target component: I (electric current)=380A, f (frequency)=～3.5Hz；End electromagnetic agitation target is joined
Number: I=350A, f=7～8Hz；Two streams are opened and are watered, and start to walk pulling rate 0.5m/min, transfers liquid level to automatic after opening and watering normal 2 minutes
Control system, after liquid level is steady, slowly rise pulling rate is to 1.0m/min, and bag temperature drop situation in noting in cast works as the degree of superheat
When 30-35 DEG C, increasing pulling rate is to 1.2m/min, and low temperature draws soon as far as possible, it is ensured that continuous casting billet quality, continuous casting fixed-length 3 meters, air cooling heap
Put；
5th step: roll front heating, heats in pusher-type furnace, and continuous casting square billet heating-up temperature is by control claimed below:
Preheating section≤1050 DEG C；Bringing-up section: 1050～1080 DEG C, soaking zone: 1180～1200 DEG C；
6th step: high-speed wire rolling, start rolling temperature: 1170 DEG C, entering finishing mill temperature is 1030 DEG C, and finish to gauge is weaved silk temperature
Degree is 1120 DEG C, enters water cooling after weaving silk.
Outlet section mill speed 1.15m/s is rolled in one；Pre-finish rolling outlet section speed controlling rolls at 5.60m/s, outlet section
Speed controlling is at 33m/s, and specification is φ 6.7mm ± 0.15mm, after Forced water cooling of weaving silk after Stanermo wind-cooling linear cools down
Entering and collect volume, after collection, packing and transporting enters heat treatment step；
7th step: heat treatment, uses off-line type solution treatment, solid solubility temperature 1060-1080 DEG C, time 50min.Cooling side
Formula: water-cooled.Grain size: 8-10 level, sample end hardness: 32～35HRC；
8th step: aligning, immerses wire rod in Calx coating solution and keeps a moment, and pull-out, natural drying, with face coat
Be dried, turning white is as the criterion, and wire rod uses seven roller straighteners to align, and controls linearity≤1mm/m；
9th step: polishing, uses M1080 centerless grinder, three thick essences, finally obtains specification φ 6.7mm light rod.
Mechanical performance index after light rod heat treatment (solid solution+Ageing Treatment) is as follows:
Embodiment two
The wire rod specification producing a stove 53Cr21Mn9Ni4N is φ 6.5mm product.Its technological process of production is as follows: EBT electricity
Stove smelting → AOD smelting → LF refine → two stream 150 × 150mm continuous small-billet casting → heating → high-speed wire rolling → hot online
Process → align → polish → check qualified → finished product warehouse-in.Concrete production stage is:
The first step: allocate steel scrap and high carbon ferro-chrome, nickel iron alloys material in electric arc furnace into, carries out melting just refining.Tapping temperature
Degree is 1610 DEG C, P:0.036%；
Second step: AOD smelts, and the nitrogen flushing heat of oxidation is smelted with oxygen, when temperature reaches >=1660 DEG C, when C≤0.60%, opens
Begin to add ferrosilicon amount restoring operation, nitrogen blowing alloying, adjust alloy.When composition meets standard-required, during temperature T >=1490 DEG C
Tapping, turns LF refine；
3rd step: LF refine, finely tunes composition, temperature, keeps white slag operation, after molten steel temperature reaches continuous casting bull ladle temperature
Can tap.Tapping molten steel composition is: C:0.53%；Si:0.25%；Mn:8.67%；P:0.032%；S:0.005%；Ni:
3.83%；Cr:21.05%；N:0.41%；Tapping soft blow stands bull ladle after 15min；
4th step: continuous casting bull ladle temperature is 1500 DEG C, during cast, M-EMS parameter is set to: I=380A, f
=～3.5Hz；End stirring parameter is set to: I=350A, f=7～8Hz；Starting pulling rate 0.6m/min, waits to open and just waters
Transferring automatic control system for liquid level to after normal 3 minutes, after liquid level is steady, slowly rise pulling rate is to 1.1m/min, in noting in cast
Bag temperature drop situation, when the degree of superheat is 25-30 DEG C, strengthens pulling rate and draws soon to 1.2m/min, low temperature, it is ensured that continuous casting billet quality, even
Strand scale 3 meters, air cooling is stacked；
5th step: roll front heating, heats in walking beam furnace, and continuous casting square billet heating-up temperature is by control claimed below:
Preheating section≤1050 DEG C；Bringing-up section: 1030～1060 DEG C, soaking zone: 1170～1190 DEG C；
6th step: high-speed wire rolling, start rolling temperature is 1180 DEG C, and finish to gauge laying temperature is 1110 DEG C, enters water after weaving silk
Cooling.Rolling outlet section mill speed in one is 1.10m/s；Pre-finish rolling outlet section speed controlling is in 5.30m/s, outlet section rolling speed
Degree controls at 28m/s, and specification is φ 6.5mm ± 0.15mm, enters after water-cooled of weaving silk after Stanermo wind-cooling linear cools down
Collecting volume, after collection, packing and transporting enters heat treatment step；
7th step: enter water cooling online.Grain size: 10-12 level, sample end hardness: 34～37HRC；
8th step: aligning, immerses wire rod in Calx coating solution and keeps a moment, and pull-out, natural drying, with face coat
Be dried, turning white is as the criterion, and wire rod uses seven roller straighteners to align, and controls linearity≤1mm/m；
9th step: polishing, uses M1080 centerless grinder, finally obtains specification φ 6.5mm light rod.
Mechanical performance index after light rod heat treatment (solid solution+Ageing Treatment) is as follows:
The production method of the Valve Steel 53Cr21Mn9Ni4N polishing bar of the present invention, uses the pouring type of continuous casting, overcomes
53Cr21Mn9Ni4N high-temp plastic is poor, resistance of deformation is difficult to greatly continuous casting feature, instead of " molding in original production procedure
→ reconditioning → cogging (rolling cogging or forging cogging) → peeling or reconditioning process-heating " link (the i.e. work of molding base breaking down cogging
Skill), directly roll with continuous casting billet, greatly reduce the materials processing loss in this link and energy consumption, improve blank
Lumber recovery；All need to carry out the heat treated of blank before conventional production uses rolling or hammer cogging, cogging and rolling, be commonly called as
" two pyrogene materials "；The manufacturing process of the present invention have employed continuous casting billet direct high-speed rod precision rolling technology, improve production
Efficiency, mill product wire rod dimension control is also greatly improved, it is achieved that 53Cr21Mn9Ni4N steel continuous casting billet Direct Rolling arrives
" one-heating forming " of wire rod；Heat treatment achieves off-line and online two ways, can require to carry out free choosing according to Customer Quality
Select.
The invention is not limited in described embodiment, those skilled in the art is in the spirit without departing from the present invention i.e. public affairs
In the range of opening, still can make some revise or change, therefore the scope of the present invention with claims limit in the range of
Accurate.
Claims (6)
1. the production method of Valve Steel 53Cr21Mn9Ni4N polishing bar, it is characterised in that described production method include with
Lower step:
S1: allocate steel scrap and high carbon ferro-chrome, nickel iron alloys material in electric arc furnace into, carries out melting just refining, tapping temperature >=1600
DEG C, P≤0.040%；
S2:AOD smelts, and the nitrogen flushing heat of oxidation is smelted with oxygen, when temperature reaches >=1660 DEG C, during C≤0.60%, is initially added into ferrosilicon
Amount restoring operation, nitrogen blowing alloying, adjust alloying component；When composition meets standard-required, tap during temperature T >=1490 DEG C,
Turn LF refine；
S3:LF refine, finely tunes composition, temperature, keeps white slag operation, can go out after molten steel temperature reaches continuous casting bull ladle temperature
Steel；
S4: billet caster continuous casting, bull ladle temperature is: continuous casting first wraps 1490～1510 DEG C, even bag 1480～1500 DEG C；Casting
During, superheat of liquid steel controls between 25～35 DEG C, during cast, uses the combination side of crystallizer and end electromagnetic agitation
Formula；During ejection, mark carried out by continuous casting billet, and air cooling is stacked；
S5: roll front heating, heats in pusher-type furnace or walking beam furnace；
S6: high-speed wire rolling, start rolling temperature: 1160～1190 DEG C, finish to gauge laying temperature controls >=1050 DEG C, uses after weaving silk
Water spray forces cooling；Enter after cooling and collect volume, carry out packing and transporting after collection and enter heat treatment step；
S7: heat treatment；
S8: aligning, after 53Cr21Mn9Ni4N wire rod heat treatment, immerses wire rod in Calx coating solution and keeps a moment, draw
Go out, natural drying, be dried with face coat, turning white is as the criterion；Wire rod uses seven roller straighteners to align, linearity≤1mm/m；
And
S9: polishing, uses centerless grinder processing, first roughly grinds, and then carries out fine grinding and reaches to design requirement.
The production method of a kind of Valve Steel 53Cr21Mn9Ni4N the most as claimed in claim 1 polishing bar, it is characterised in that
In step s 4, temperature during cast is 1415-1430 DEG C, and pulling rate is 1.3-1.0m/min.
The production method of a kind of Valve Steel 53Cr21Mn9Ni4N the most as claimed in claim 2 polishing bar, it is characterised in that
In step s 4, cooling control mode is the mode that two cold-zones use syllogic subregion water distribution, when pulling rate is less than 1.0m/min,
Two three sections, cold-zone water are all turned on, and the ratio of the water distribution quantity of three sections of water is 50%:30%:20%；Specific water is automatic along with pulling rate
Coupling；During normal pulling rate scope 1.0～1.2m/min, front two sections of water yields are only opened in two cold-zones, and its allocation proportion is 55%:
45%, it is 0.27～0.32L/Kg steel that total specific water controls.
The production method of a kind of Valve Steel 53Cr21Mn9Ni4N the most as claimed in claim 1 polishing bar, it is characterised in that
In step s 5, continuous casting square billet heating and temperature control is: preheating section≤1050 DEG C；Bringing-up section: 1030～1080 DEG C；Soaking zone:
1170～1210 DEG C.
The production method of a kind of Valve Steel 53Cr21Mn9Ni4N the most as claimed in claim 1 polishing bar, it is characterised in that
In described step S6, the speed controlling of wire rod rolling is: rolling outlet section mill speed in one is 1.10～1.15m/s；Pre-finish rolling
Outlet section speed is 4.78～5.64m/s, and outlet finishing speeds is 28～33m/s.
The production method of a kind of Valve Steel 53Cr21Mn9Ni4N the most as claimed in claim 1 polishing bar, it is characterised in that
The heat treatment of described step S7 is divided into off-line type heat treatment and the online heat treatment, wherein said off-line type heat treatment method to be:
By the solution treatment of 53Cr21Mn9Ni4N hot rolling dish unit, solid solubility temperature 1040-1150 DEG C, time 30-60min；The type of cooling: water
Cold；Grain size controls requirement and is narrower than 6 grades, and sample end hardness is 32～37HRC；Described online heat treatment method is: will
53Cr21Mn9Ni4N continuous casting billet rolls through fast mill, and rolling heating technique need to meet the requirement that step 5 is described, and wire rod exists
Using burning optimization on line mode after weaving silk, i.e. enter water cooling, grain size controls requirement and is narrower than 8 grades, sample end hardness be 31～
36HRC。
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|---|---|---|---|
| CN201610722947.2A CN106269869A (en) | 2016-08-25 | 2016-08-25 | A kind of production method of Valve Steel 53Cr21Mn9Ni4N polishing bar |
| US15/682,572 US20180056348A1 (en) | 2016-08-25 | 2017-08-22 | Method for Producing Polishing Bar Made of Valve Steel 53Cr21Mn9Ni4N |
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| CN201610722947.2A CN106269869A (en) | 2016-08-25 | 2016-08-25 | A kind of production method of Valve Steel 53Cr21Mn9Ni4N polishing bar |
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| CN201610722947.2A Pending CN106269869A (en) | 2016-08-25 | 2016-08-25 | A kind of production method of Valve Steel 53Cr21Mn9Ni4N polishing bar |
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| CN108034895A (en) * | 2018-01-15 | 2018-05-15 | 江苏申源特钢有限公司 | A kind of Valve Steel 50Cr21Mn9Ni4Nb2WN polishes the production method of bright as silver bar |
| CN108220750A (en) * | 2018-01-15 | 2018-06-29 | 江苏申源特钢有限公司 | A kind of production method of the bright as silver bars of high carbon martensite Valve Steel 85Cr18Mo2V |
| CN108380835A (en) * | 2018-04-17 | 2018-08-10 | 攀钢集团江油长城特殊钢有限公司 | The low segregation air valve steel continuous casting billet of one kind and its manufacturing method |
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| CN113770652B (en) * | 2021-09-13 | 2024-04-02 | 泰州市新龙翔金属制品有限公司 | Energy-saving disc round steel processing technology |
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