CN106086697A - A kind of based on ferro-boron casting mill guide wheel and heat treatment method thereof - Google Patents
A kind of based on ferro-boron casting mill guide wheel and heat treatment method thereof Download PDFInfo
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- CN106086697A CN106086697A CN201610695888.4A CN201610695888A CN106086697A CN 106086697 A CN106086697 A CN 106086697A CN 201610695888 A CN201610695888 A CN 201610695888A CN 106086697 A CN106086697 A CN 106086697A
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D9/34—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tyres; for rims
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/002—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
- C22C38/06—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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of based on ferro-boron casting mill guide wheel and heat treatment method thereof.Chemical composition and weight/mass percentage composition (%) thereof including mill guide wheel be: C 1.25 1.45, Cr 21.0 25.0, B 9.0 9.5, Mo 1.5 1.8, Mn 2.8 3.5, Al 0.50 0.630, RE 0.08 0.120, Mg 0.04 0.06, V 0.15 0.210, N 0.01 0.03, Ti 0.210 0.320, Nb 0.11 0.20, and 0.45≤Ti+Nb≤0.55, Si ＜ 1.0, S ＜ 0.05, P ＜ 0.05, surplus is Fe.Mill guide wheel of the present invention has high ferro-boron, boron solid solution capacity in the base is the lowest, primarily enter in carbide, form hardness height, the type carbon-boron compound of Heat stability is good, also generation hardness height, the type borocarbide of Heat stability is good is combined with ferrum, thus improve wearability and the rigidity of structure of mill guide wheel, and then improve the service life of mill guide wheel.
Description
Technical field
The invention belongs to mill guide wheel technical field, particularly relate to a kind of based on ferro-boron casting mill guide wheel and
Heat treatment method.
Background technology
Guide wheel is the important spare part that consumption is bigger in hot rolled rod production line, is the crucial portion in steel rolling guide assembly
Part, the shadow land measure equal to fifteen mu in most parts of the Northeast the technical-economic indexes such as operating rate of rolling mill.The a lot of guide and guard part heat resistances used are not enough, occur that steel bonding etc. shows
As, also have some process conditions wearabilities, thermal fatigue property bad, have impact on service life and mill bar quality.
The physical essence of hardness abrasion is the fracture process of a kind of specific form, occurs at the top layer of wear-out part and Ya Biao
Layer.When considering hardness number, it is impossible to simply think that hardness more high-wearing feature is the best, its under various regimes hard to be taken into full account
Degree.Such as: the hardness changed due to Surface hardened layer or softening in work process；Surface is made owing to contacting with high temperature rolled piece
Temperature raises, and will consider temperature hardness.
Toughness rolls the fracture of guide wheel and is generally brittle fracture.For preventing the generation of brittle failure, resisting of material to be improved constantly
Fracture energy.
In steel, add 0.07%B be remarkably improved the quenching degree of steel.Warp in the rustless steel of boron addition 18%Cr, 8%Ni
Cross process and can make precipitation-hardening, improve elevated temperature strength and hardness.In cast iron, boron can affect graphitization, thus increases the deep of spoken parts in traditional operas
Degree makes it chill wear-resisting.In malleable cast iron, add the boron of 0.001%～0.005%, advantageously form spheroidal graphite and improve its distribution
Situation.Current low aluminum, low-carbon (LC) ferro-boron are the main raw material(s)s of amorphous alloy.
Summary of the invention
It is an object of the invention to provide a kind of based on ferro-boron casting mill guide wheel and heat treatment method thereof, by leading
Defending guide wheel and have high ferro-boron, boron solid solution capacity in the base is the lowest, primarily enters in carbide, forms hardness high, thermally-stabilised
Property good type carbon-boron compound, be also combined with ferrum that generation hardness is high, the type borocarbide of Heat stability is good, thus improve guide and guard
The wearability of guide wheel and the rigidity of structure, and then improve the service life of mill guide wheel.
For solving above-mentioned technical problem, the present invention is achieved by the following technical solutions:
The present invention is a kind of based on ferro-boron casting mill guide wheel, including chemical composition and the quality hundred thereof of mill guide wheel
Point content (%) is: C 1.25-1.45, Cr 21.0-25.0, B 9.0-9.5, Mo 1.5-1.8, Mn 2.8-3.5, Al
0.50-0.630、RE 0.08-0.120、Mg 0.04-0.06、V 0.15-0.210、N 0.01-0.03、Ti 0.210-
0.320, Nb 0.11-0.20, and 0.45≤Ti+Nb≤0.55, Si ＜ 1.0, S ＜ 0.05, P ＜ 0.05, surplus is Fe.
Further, described following steps:
Step one, melts steel scrap, ferrochrome and molybdenum-iron Hybrid Heating, adds ferromanganese, be warming up to 1480-after molten steel is melting down
When 1500 DEG C, add aluminum, be then sequentially added into ferro-boron, ferrotianium and ferro-niobium, after stokehold adjusting component is qualified, liquid steel temperature risen to
1520-1550 DEG C, come out of the stove after skimming；
Step 2, by V content be 70-85wt%, leaded wastewater be V-N alloy breaks down to the granularity of 15-30wt% be 3-8mm
Fritter, with thickness less than 0.8mm steel disc parcel tight, tapping 40-60% time, the V-N alloy wrapped is poured with molten steel
Casting ladle；
Step 3, by the fritter of magnesium-rare earth abrasive particle degree 0.01-0.5mm, after less than 220 DEG C dry, is placed in casting ladle
Bottom, pours method molten steel is carried out compound modification treatment in bag；
Step 4, pours into a mould mill guide wheel, pouring molten steel temperature 1420-1460 DEG C；
Step 5, heat treatment: the Technology for Heating Processing of guide and guard is: as cast condition guide and guard are heated to 980-1020 DEG C, it is incubated 1-4h
After, mass ratio >=10 of cooling 0.5-2.0h, quenching oil and foreplate in the temperature quenching oil less than 60 DEG C: 1, finally heated
To 180-220 DEG C, after insulation 3-6h, air is cooled to room temperature；
The Technology for Heating Processing of guide wheel is: by as cast condition guide wheel roller after 880-920 DEG C of soft annealing 2-4h, and stove is cooled to temperature and is
When 500-550 DEG C, air cooling, then carry out roughing；Again the Roll Collar after roughing is heated to 980-1020 DEG C, is incubated 1-4h
After, in temperature is less than the quenching oil of 60 DEG C, cool down 0.5-2.0h, mass ratio >=10 of quenching oil and guide wheel: 1, finally heated extremely
180-220 DEG C, after insulation 3-6h, air is cooled to room temperature, is machined to given size and precision.
The method have the advantages that
The mill guide wheel of the present invention has high ferro-boron, and boron solid solution capacity in the base is the lowest, primarily enters in carbide,
Form hardness height, the type carbon-boron compound of Heat stability is good, be also combined generation hardness height, the type boron carbonization of Heat stability is good with ferrum
Compound, thus improve wearability and the rigidity of structure of mill guide wheel, and then improve the service life of mill guide wheel.
Certainly, the arbitrary product implementing the present invention it is not absolutely required to reach all the above advantage simultaneously.
Detailed description of the invention
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described,
Obviously, described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based in the present invention
Embodiment, all other embodiments that those of ordinary skill in the art are obtained under not making creative work premise, all
Belong to the scope of protection of the invention.
A kind of based on ferro-boron casting mill guide wheel, including chemical composition and the weight/mass percentage composition thereof of mill guide wheel
(%) be: C 1.25-1.45, Cr 21.0-25.0, B 9.0-9.5, Mo 1.5-1.8, Mn2.8-3.5, Al 0.50-0.630,
RE 0.08-0.120、Mg 0.04-0.06、V 0.15-0.210、N 0.01-0.03、Ti 0.210-0.320、Nb 0.11-
0.20, and 0.45≤Ti+Nb≤0.55, Si ＜ 1.0, S ＜ 0.05, P ＜ 0.05, surplus is Fe.
A kind of heat treatment method based on ferro-boron casting mill guide wheel, comprises the steps:
Step one, melts steel scrap, ferrochrome and molybdenum-iron Hybrid Heating, adds ferromanganese, be warming up to 1480-after molten steel is melting down
When 1500 DEG C, add aluminum, be then sequentially added into ferro-boron, ferrotianium and ferro-niobium, after stokehold adjusting component is qualified, liquid steel temperature risen to
1520-1550 DEG C, come out of the stove after skimming；
Step 2, by V content be 70-85wt%, leaded wastewater be V-N alloy breaks down to the granularity of 15-30wt% be 3-8mm
Fritter, with thickness less than 0.8mm steel disc parcel tight, tapping 40-60% time, the V-N alloy wrapped is poured with molten steel
Casting ladle；
Step 3, by the fritter of magnesium-rare earth abrasive particle degree 0.01-0.5mm, after less than 220 DEG C dry, is placed in casting ladle
Bottom, pours method molten steel is carried out compound modification treatment in bag；
Step 4, pours into a mould mill guide wheel, pouring molten steel temperature 1420-1460 DEG C；
Step 5, heat treatment: the Technology for Heating Processing of guide and guard is: as cast condition guide and guard are heated to 980-1020 DEG C, it is incubated 1-4h
After, mass ratio >=10 of cooling 0.5-2.0h, quenching oil and foreplate in the temperature quenching oil less than 60 DEG C: 1, finally heated
To 180-220 DEG C, after insulation 3-6h, air is cooled to room temperature；
The Technology for Heating Processing of guide wheel is: by as cast condition guide wheel roller after 880-920 DEG C of soft annealing 2-4h, and stove is cooled to temperature and is
When 500-550 DEG C, air cooling, then carry out roughing；Again the Roll Collar after roughing is heated to 980-1020 DEG C, is incubated 1-4h
After, in temperature is less than the quenching oil of 60 DEG C, cool down 0.5-2.0h, mass ratio >=10 of quenching oil and guide wheel: 1, finally heated extremely
180-220 DEG C, after insulation 3-6h, air is cooled to room temperature, is machined to given size and precision.
Mill guide wheel has high ferro-boron, and boron solid solution capacity in the base is the lowest, primarily enters in carbide, forms hardness
High, the type carbon-boron compound of Heat stability is good, is also combined generation hardness height, the type borocarbide of Heat stability is good with ferrum, from
And improve wearability and the rigidity of structure of mill guide wheel, and then improve the service life of mill guide wheel.
Chromium adds in steel, and part is combined generation high rigidity carbide with carbon, is conducive to improving the wearability of mill guide wheel, portion
Dividing and be dissolved in matrix, can improve the non-oxidizability of matrix, chromium content is too low, and the antioxygenic property of mill guide wheel is low, causes guide and guard to make
By the lost of life, chromium too high levels, the chromium amount of solid solution in matrix is too much, owing to chromium is the element reducing γ phase region, causes quenching
Occurring the ferrite of soft, on the contrary infringement guide and guard wearability in matrix, chromium content controls, when 12.0-15.0%, to quench
Fire is organized based on martensite, and the most a small amount of retained austenite has good combination property.
In mill guide wheel, add appropriate molybdenum, be conducive to improving the mechanical behavior under high temperature of guide and guard, improve guide and guard using effect,
Also can alleviate the temper brittleness of guide and guard, but molybdenum element is expensive, addition is too much, will increase guide and guard production cost, and therefore close
Suitable molybdenum content is 0.5-0.8%.
Vanadium, nitrogen, niobium, titanium: high-boron cast alloy uses VN alloy to have the effect of fining austenite grains, the most permissible
Properly increase hardening heat, reduce superheated susceptivity during Quench heating.The addition of vanadium, titanium and niobium, can form VC, TiC, NbC
Etc. dystectic particle, add chromium eutectic carbide and boride crystallization nuclei quantity, refine as-cast grain, make alloy carbide
Thing trends towards granular, alloy boride and trends towards suspension and isolated distribution, favourable to the intensity of steel and the raising of toughness.
In the description of this specification, the description of reference term " embodiment ", " example ", " concrete example " etc. means
Specific features, structure, material or feature in conjunction with this embodiment or example description is contained at least one enforcement of the present invention
In example or example.In this manual, the schematic representation to above-mentioned term is not necessarily referring to identical embodiment or example.
And, the specific features of description, structure, material or feature can be to close in any one or more embodiments or example
Suitable mode combines.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.Preferred embodiment is the most detailed
Describe all of details, be also not intended to the detailed description of the invention that this invention is only described.Obviously, according to the content of this specification,
Can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is to preferably explain the present invention
Principle and actual application so that skilled artisan can be best understood by and utilize the present invention.The present invention is only
Limited by claims and four corner thereof and equivalent.
Claims (2)
1. one kind casts mill guide wheel based on ferro-boron, it is characterised in that the chemical composition of described mill guide wheel and quality thereof
Percentage composition (%) is: C 1.25-1.45, Cr 21.0-25.0, B 9.0-9.5, Mo 1.5-1.8, Mn 2.8-3.5, Al
0.50-0.630、RE 0.08-0.120、Mg 0.04-0.06、V 0.15-0.210、N 0.01-0.03、Ti 0.210-
0.320, Nb 0.11-0.20, and 0.45≤Ti+Nb≤0.55, Si ＜ 1.0, S ＜ 0.05, P ＜ 0.05, surplus is Fe.
A kind of heat treatment method based on ferro-boron casting mill guide wheel, it is characterised in that bag
Include following steps:
Step one, melts steel scrap, ferrochrome and molybdenum-iron Hybrid Heating, adds ferromanganese, be warming up to 1480-1500 DEG C after molten steel is melting down
Time, add aluminum, be then sequentially added into ferro-boron, ferrotianium and ferro-niobium, after stokehold adjusting component is qualified, liquid steel temperature risen to 1520-
1550 DEG C, come out of the stove after skimming；
Step 2, by V content be 70-85wt%, leaded wastewater be V-N alloy breaks down to the granularity of 15-30wt% be the little of 3-8mm
Block, tight less than 0.8mm steel disc parcel with thickness, during tapping 40-60%, the V-N alloy wrapped is poured casting ladle with molten steel；
Step 3, by the fritter of magnesium-rare earth abrasive particle degree 0.01-0.5mm, after less than 220 DEG C dry, is placed in bottom casting ladle,
Pour method molten steel is carried out compound modification treatment in bag；
Step 4, pours into a mould mill guide wheel, pouring molten steel temperature 1420-1460 DEG C；
Step 5, heat treatment: the Technology for Heating Processing of guide and guard is: as cast condition guide and guard are heated to 980-1020 DEG C, after insulation 1-4h,
Temperature less than the quenching oil of 60 DEG C cools down 0.5-2.0h, mass ratio >=10 of quenching oil and foreplate: 1, finally heated extremely
180-220 DEG C, after insulation 3-6h, air is cooled to room temperature；
The Technology for Heating Processing of guide wheel is: by as cast condition guide wheel roller after 880-920 DEG C of soft annealing 2-4h, and it is 500-that stove is cooled to temperature
When 550 DEG C, air cooling, then carry out roughing；Again the Roll Collar after roughing is heated to 980-1020 DEG C, after insulation 1-4h,
In temperature is less than the quenching oil of 60 DEG C, cool down 0.5-2.0h, mass ratio >=10 of quenching oil and guide wheel: 1, finally heated extremely
180-220 DEG C, after insulation 3-6h, air is cooled to room temperature, is machined to given size and precision.
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| CN201610695888.4A CN106086697A (en) | 2016-08-19 | 2016-08-19 | A kind of based on ferro-boron casting mill guide wheel and heat treatment method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108624799A (en) * | 2018-05-14 | 2018-10-09 | 合肥东方节能科技股份有限公司 | A kind of composition metal mill guide wheel |
| CN109023146A (en) * | 2018-08-13 | 2018-12-18 | 林州凤宝管业有限公司 | One kind is based on ferro-boron casting mill guide wheel and its heat treatment method |
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| CN102383044A (en) * | 2011-10-28 | 2012-03-21 | 西安交通大学 | Multicomponent low alloy high speed steel used for preparing roller |
| CN102560258A (en) * | 2012-01-06 | 2012-07-11 | 北京工业大学 | Low-carbon high-boron cast wear-resistant alloy steel and preparation method thereof |
| CN103014516A (en) * | 2012-12-21 | 2013-04-03 | 江苏大学 | Borated low-alloy high-speed steel roller and manufacturing method thereof |
| CN103320720A (en) * | 2013-07-15 | 2013-09-25 | 四川大学 | Vanadium-containing high-boron high-chromium wear-resistant alloy and preparation method thereof |
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2016
- 2016-08-19 CN CN201610695888.4A patent/CN106086697A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101549360A (en) * | 2009-04-03 | 2009-10-07 | 北京工业大学 | A high-boron cast alloy guide and its heat treatment method |
| CN102383044A (en) * | 2011-10-28 | 2012-03-21 | 西安交通大学 | Multicomponent low alloy high speed steel used for preparing roller |
| CN102560258A (en) * | 2012-01-06 | 2012-07-11 | 北京工业大学 | Low-carbon high-boron cast wear-resistant alloy steel and preparation method thereof |
| CN103014516A (en) * | 2012-12-21 | 2013-04-03 | 江苏大学 | Borated low-alloy high-speed steel roller and manufacturing method thereof |
| CN103320720A (en) * | 2013-07-15 | 2013-09-25 | 四川大学 | Vanadium-containing high-boron high-chromium wear-resistant alloy and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108624799A (en) * | 2018-05-14 | 2018-10-09 | 合肥东方节能科技股份有限公司 | A kind of composition metal mill guide wheel |
| CN108624799B (en) * | 2018-05-14 | 2020-06-16 | 合肥东方节能科技股份有限公司 | Composite metal guide wheel |
| CN109023146A (en) * | 2018-08-13 | 2018-12-18 | 林州凤宝管业有限公司 | One kind is based on ferro-boron casting mill guide wheel and its heat treatment method |
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Application publication date: 20161109 |