CN103691903B - Manufacturing process for centrifugal casting of multi-element eutectic high-alloy rolls - Google Patents

Manufacturing process for centrifugal casting of multi-element eutectic high-alloy rolls Download PDF

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Publication number
CN103691903B
CN103691903B CN201310738682.1A CN201310738682A CN103691903B CN 103691903 B CN103691903 B CN 103691903B CN 201310738682 A CN201310738682 A CN 201310738682A CN 103691903 B CN103691903 B CN 103691903B
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China
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roll
molten metal
working lining
casting
eutectic
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CN201310738682.1A
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Chinese (zh)
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CN103691903A (en
Inventor
那顺桑
孙宝平
汪允春
王素平
孙春生
张自立
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唐山联强冶金轧辊有限公司
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Abstract

The invention relates to a manufacturing process for centrifugal casting of multi-element eutectic high-alloy rolls, and belongs to the technical field of metallurgical rolls. The technical scheme includes that eutectic compositions are selected as materials of a roll working layer, and besides five elements of C, Mn, Si, P and S commonly existing in steel, the alloying elements of Cr, Ni, Mo, V, Nb, W and B need to be added into the roll materials to form a multi-element alloying state; carbon content of the roll materials is controlled to be 1.3%-2.8% in mass percent. The manufacturing process is small in solidification temperature range of the eutectic compositions, and particularly suitable for obtaining high-quality castings under the circumstance that feeding conditions are insufficient; the castings are crystallized simultaneously, and optimal in composition uniformity, concentrated cavity shrinkage is formed, metallic yield by casting moulding is high; the metal is solidified at the same time, and casting stress in the process of solidification is minimum; the eutectic compositions in alloy are lowest in melting point, and smelting cost is also low; liquid of the eutectic compositions is best in fluidity; castability is improved, and abrasion resistance and heat resistance are taken into consideration.

Description

The manufacturing process of centrifugal casting multi-element eutectic high alloy roll
Technical field
The present invention relates to a kind of manufacturing process of centrifugal casting multi-element eutectic high alloy roll, belong to metallurgical roller technical field.
Background technology
Roll is the important consumable tool of metallurgy industry steel rolling link.The condition of work of roll is severe, bears significant load, and business capital occupancy is large, and the performance of the remarkable influence of rolled product of roll quality and index, in strip production, roll consumption takies significant proportion.The ability of present domestic production roll is more than 1,000,000 tons.Roll quality is uneven, and consumption indicators height is different, and roll industry competition is fierce.The method of roll manufacture mainly contains following several at present in China: forging roller, conventional cast roll, centrifugal casting roll, injection molding roll, electroslag remelting roll, continuous pouring outer formable layer, assembly roller etc.Wherein centrifugal casting roll output and consumption maximum.Divide by material category: cast steel roll, cast iron and steel, forged steel roll, ferrosteel roll, carbide collars, powder metallurgy roll, spheroidal graphite roll, bainite roll, indefinite chill roll, Producing Graphite Steel Rollers, high-speed steel roll, etc.
When discussing roll condition of work, all can expect that roll works under the complex stress conditions such as bending stress, distorting stress, friction stree, contact stress.In addition, work under being also subject to bending fatigue stress, torsional fatigue stress, contact fatigue stress, fatigue under scrubbing stress, the effect of temperature (heat) fatigue stress.This is broad sense.Discussion of the present invention be the problem that roll bears applied stress on different milling train, for China the most general 18 framves arrangement bar materials on continuous rolling mill illustratively roll condition of work.During current 18 rolling mill rolled bar material, raw material majority is 150mm × 150mm square billet.When milling train is divided into roughing mills, intermediate mill, pre-finishing mill group and mm finishing mill unit, mill speed, draught pressure, roll duty are differentiated.Wherein typical a few rolling mill information summary arrangement in table 1.
As seen from Table 1, roll load difference on different sortie of bearing is very large.We can be interpreted as roll thermal shock number of times and stress fatigue parameter that column data of roll rotational speed in addition.Learn that roll works under complex environment a very wide range of stress with very.Basic principle is: roughing mill roll completes the large pressure of high temperature, long for time of contact with rolled piece, and thermic load is large, and thermal stability requirement is high, and rolling load (in table unit width rolling pressure) is relatively little, and workpiece measurement required precision is also low.Intermediate mill, rolling load increases, with the time of contact of rolled piece shorter, roller diameter starts to diminish, and wearability requires higher.So need wearability and heat resistance to take into account.Mm finishing mill unit works under the condition of running up.Mainly high speed, stably bright and clean, the accurate in size rolled piece product in rolling ejecting plate face under large concentrated load.The requirement mainly wearability of breaker roll.
Background technology Problems existing is: roll strength is poor, and the life-span is low, and wearability and heat resistance can not be taken into account, and making, transport, keeping each side quite bother, and user uses also very difficult.
Summary of the invention
The object of the invention is to provide a kind of manufacturing process of centrifugal casting multi-element eutectic high alloy roll, improve casting character, adopt multi-element alloyed, roll working layer selects eutectic composition, wearability and heat resistance are taken into account, and solve the problems referred to above existed in background technology.
Technical scheme of the present invention is:
The manufacturing process of centrifugal casting multi-element eutectic high alloy roll, comprises smelting metal liquid, cast, moulding operation, and each operation concrete steps are as follows:
1. smelting metal liquid; Roll working layer selects eutectic composition, and so-called eutectic composition is that the temperature spot that alloy is determined at when crystallization completes crystallization, is formed and obtains eutectic structure; The acquisition of eutectic composition is under the condition added in multiple element compound, calculates according to thermodynamic principles; In roll material except often depositing Elements C, the large element of Mn, Si, P, S five in steel, add Cr, Ni, Mo, V, Nb, W, B alloying element, come from different backgrounds and possess different abilities alloyed state; The phosphorus content controlling roll material is 1.3% ~ 2.8%(mass percent);
Describedly add alloying element, according to roll condition of work, determine alloying element content, finally obtain eutectic composition; Roll condition of work is middle milling train, and the concrete kind of alloying element is C, Cr, Ni, Mo, V, Nb, W, B, and mass percentage is respectively: 1.3-2.8%, 5-20%, 2-6%, 1-10%, 1-10%, 0.5-5%, 0-8%, 0-1.2%; Roll condition of work is finishing mill, and the concrete kind of alloying element is C, Cr, Ni, Mo, V, Nb, W, B, and mass percentage is respectively: 1.3-2.8%, 5-30%, 3-6%, 1-10%, 1-10%, 0.5-5%, 0-8%, 0-1.2%;
With electric arc furnaces or induction furnace melting molten metal, adopt high temperature melting technique, higher than normal melting temperature 20 DEG C, temperature range is 1520-1600 DEG C, is smelted into roll working lining molten metal;
2. pour into a mould; Tap a blast furnace according to high temperature, the principle of cast cold carries out the centrifugal casting of roll working lining; Before centrifugal casting, select the centrifugal mold matched with roller diameter, at centrifugal mold inner brushing heat proof material coating, centrifugal mold is put into drying oven drying and dewatering; Bake out temperature 400-450 DEG C, after moisture is got rid of completely in heat proof material, take out centrifugal mold, install end cap, end cap middle with hole, so that casting of molten metal, with set bolt by end cap fixation, is put on centrifuge and rotates; Molten metal cup is installed in centrifuge end, and cup is positioned at end cap central bore place, prevents from colliding with the centrifugal mold rotated;
Start centrifuge, roll working lining molten metal is poured under centrifugal mold rotary state, after casting complete, be oxidized for preventing molten metal inner surface, be sprinkled into glass dregs, the amount of being sprinkled into is the 2-10%(mass ratio of the roll working lining molten metal amount of pouring into), glass dregs covers working lining metallic interior surface, form melt liquid (because glass dregs fusing point is more much lower than molten metal), cover roll working lining molten metal inner surface; Roll working lining molten metal completes and solidifies under centrifugal mold rotary state; After roll working lining pouring metal melt, centrifugal mold continues to rotate 15-60 minute, ensures that molten metal solidifies completely, forms roll working lining;
3. moulding; Melting roller neck material and core of the roll material, roller neck material is identical with core of the roll material, and makes them solidify synchronous with roll working lining molten metal; Roll casting mold is vertical, and namely die cavity from bottom to top: lower roll neck, the body of roll, upper roll neck, rising head; Pour into a mould core of the roll, roll working lining, roll neck simultaneously, complete after solidifying cooling, unpack, roughing, heat treatment is refined to finished product.
Beneficial effect of the present invention: eutectic alloy has features and advantage, and solidification temperature range is little, obtains superior in quality foundry goods under being particularly suitable for the not enough situation of feeding condition; Foundry goods crystallization simultaneously, homogeneity of ingredients is best; Form concentrating shrinkage cavity, moulding by casting recovery rate of iron is high; Metal solidifies simultaneously, and the casting stress of process of setting is minimum; Eutectic composition fusing point is in the alloy minimum, and melting cost is also low; The mobility of eutectic composition liquid is also best; The present invention improves casting character, adopts multi-element alloyed, and roll working layer selects eutectic composition, not only has crystalline structure densification, advantage that crystal defect is few, and wearability and heat resistance are taken into account.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention process chart.
Detailed description of the invention
Below in conjunction with accompanying drawing, by embodiment, the invention will be further described.
In embodiment, concrete technology step is with reference to accompanying drawing, embodiment product tool after certain company Bar Plant uses increases significantly roll campaign effect: on the 16 rolling mill (cutting sortie, scene is called K3 milling train) of three-line syncopate, single groove steel transportation amount reaches 1366 tons.And the common roll list groove steel transportation amount of same position only has 300 ~ 400 tons (average 370 tons) on this production line of bar, improve roll campaign more than 3 times.

Claims (1)

1. a manufacturing process for centrifugal casting multi-element eutectic high alloy roll, it is characterized in that comprising smelting metal liquid, cast, moulding operation, each operation concrete steps are as follows:
1. smelting metal liquid; Roll working layer selects eutectic composition, and so-called eutectic composition is that the temperature spot that alloy is determined at when crystallization completes crystallization, is formed and obtains eutectic structure; The acquisition of eutectic composition is under the condition added in multiple element compound, calculates according to thermodynamic principles; In roll material except often depositing Elements C, the large element of Mn, Si, P, S five in steel, add Cr, Ni, Mo, V, Nb, W, B alloying element, come from different backgrounds and possess different abilities alloyed state; The phosphorus content controlling roll material is 1.3% ~ 2.8%(mass percent);
Add described alloying element, according to roll condition of work, determine alloying element content, finally obtain eutectic composition; Roll condition of work is middle milling train, and the concrete kind of alloying element is C, Cr, Ni, Mo, V, Nb, W, B, and mass percentage is respectively: 1.3-2.8%, 5-20%, 2-6%, 1-10%, 1-10%, 0.5-5%, 0-8%, 0-1.2%; Roll condition of work is finishing mill, and the concrete kind of alloying element is C, Cr, Ni, Mo, V, Nb, W, B, and mass percentage is respectively: 1.3-2.8%, 5-30%, 3-6%, 1-10%, 1-10%, 0.5-5%, 0-8%, 0-1.2%;
With electric arc furnaces or induction furnace melting molten metal, adopt high temperature melting technique, higher than normal melting temperature 20 DEG C, temperature range is 1520-1600 DEG C, is smelted into roll working lining molten metal;
2. pour into a mould; Tap a blast furnace according to high temperature, the principle of cast cold carries out the centrifugal casting of roll working lining; Before centrifugal casting, select the centrifugal mold matched with roller diameter, at centrifugal mold inner brushing heat proof material coating, centrifugal mold is put into drying oven drying and dewatering; Bake out temperature 400-450 DEG C, after moisture is got rid of completely in heat proof material, take out centrifugal mold, install end cap, end cap middle with hole, so that casting of molten metal, with set bolt by end cap fixation, is put on centrifuge and rotates; Molten metal cup is installed in centrifuge end, and cup is positioned at end cap central bore place, prevents from colliding with the centrifugal mold rotated;
Start centrifuge, roll working lining molten metal is poured under centrifugal mold rotary state, after casting complete, be oxidized for preventing molten metal inner surface, be sprinkled into glass dregs, the amount of being sprinkled into is the 2-10%(mass ratio of the roll working lining molten metal amount of pouring into), glass dregs covers working lining metallic interior surface, form melt liquid, cover roll working lining molten metal inner surface; Roll working lining molten metal completes and solidifies under centrifugal mold rotary state; After roll working lining pouring metal melt, centrifugal mold continues to rotate 15-60 minute, ensures that molten metal solidifies completely, forms roll working lining;
3. moulding; Melting roller neck material and core of the roll material, roller neck material is identical with core of the roll material, and makes them solidify synchronous with roll working lining molten metal; Roll casting mold is vertical, and namely die cavity from bottom to top: lower roll neck, the body of roll, upper roll neck, rising head; Pour into a mould core of the roll, roll working lining, roll neck simultaneously, complete after solidifying cooling, unpack, roughing, heat treatment is refined to finished product.
CN201310738682.1A 2013-12-30 2013-12-30 Manufacturing process for centrifugal casting of multi-element eutectic high-alloy rolls CN103691903B (en)

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CN103962526B (en) * 2014-05-26 2016-01-20 乐山斯堪纳机械制造有限公司 The method of trough of belt casting ductile iron roll
CN104384470B (en) * 2014-10-24 2016-07-06 唐山联强冶金轧辊有限公司 A kind of manufacturing process of bimetallic composite ring
CN105112813A (en) * 2015-07-15 2015-12-02 江苏永昊高强度螺栓有限公司 Zinc-plating bolt
CN105112792A (en) * 2015-07-15 2015-12-02 江苏永昊高强度螺栓有限公司 High-strength bolt
CN105951004B (en) * 2016-05-09 2017-12-19 吴军旺 Wear resistant corrosion resistant composite alloy roll roller production technology
CN106282838A (en) * 2016-08-23 2017-01-04 合肥东方节能科技股份有限公司 A kind of roll wear resistant alloy material and roll Technology for Heating Processing

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CN1006861B (en) * 1986-10-30 1990-02-21 四川省冶金机械厂 A roller of centrifugal composite vanadium titanium cast iron and its casting method
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CN102371273B (en) * 2010-08-20 2015-02-18 鞍钢重型机械有限责任公司 Improved high-chromium iron roller and production method thereof
CN102950269B (en) * 2012-11-28 2014-12-10 江苏共昌轧辊股份有限公司 Manufacturing method of vertical centrifugal composite cast steel supporting roll
CN103056164B (en) * 2013-01-04 2015-02-25 江苏钢宝轧辊有限公司 Reinforced chilled roll and preparation method thereof
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