CN1861827A - Half high speed steel composite roller and preparation process thereof - Google Patents
Half high speed steel composite roller and preparation process thereof Download PDFInfo
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Abstract
This invention relates to a roller for the breaking down of hot-rolling band mill and its preparation method. Its characteristic is that it contains three parts working lining, spheroidal graphite transition lining and the core. The working lining contains C 1.0-2.0wt%, Si 0.6-1.0wt%, Mn 0.2-1.0wt%, Ni 0.5-1.5wt%, Cr 4.0-6.0wt%, Mo 2.0-3.5wt%, V 2.0-4.0wt%, W 1.0-2.5wt%, Re 0.01-0.1wt%, B 0.03-0.08wt%, Al 0.03-0.1wt%, P<=0.03wt%, S<=0.015wt%, the other is Fe and some inevitable impurity. Because the content of C and alloys in the working lining are less than that in the working lining of high speed steel, so it can increase the toughness of the material, resistance of the heat shock and crack, fracture toughness property of the material. The material in the working lining is not easy to rupture fragilely and failure because of fatigue, the fatigue resistance is good, it is suitable to make of the roller of the hot plate hoop mill and the yield of the steel rolling is high.
Description
Background technology
The present invention relates to a kind ofly be used for the rolling mill for hot rolled planks and strips roughing with roll and preparation method, relate in particular to the preparation of roll working layer and roll.
Background technology
The general rolling pressure of pony roughing mill working roll is big, thermal shocking is big, requires roll to have high heat resistanceheat resistant crack performance, high red hardness, high wear resistance and high anti-fatigue performance.Finishing stand, rolling pressure is less relatively, be equivalent to about 2/3 of roughing as finish rolling leading portion rolling pressure, finish rolling back segment rolling pressure is equivalent to roughing about 1/2, and the calendering amount is less relatively, blank surface specification of quality height, the roll wear resistance is had relatively high expectations relatively, and what roll was especially paid attention to is that hardness requires and the cracking resistance line.Thereby two kinds of rolls are different to the material requirement, and the former more pays attention to high heat resistanceheat resistant crack performance, high anti-fatigue performance; The latter more pays attention to hardness and requires and the cracking resistance line.
The disclosed centrifugal composite high-speed steel roller of China CN97100083.2, the outer rapid steel that adopts, the core material of roll is an alloy nodular cast iron.The working lining chemical constitution is C1.2-2.5wt%, Si0.3-1.5wt%, Mn0.4-1.0wt%, Ni＜3.0wt%, Cr3.0-8.0wt%, Mo2.0-7.0wt%, V2.0-7.0wt%, W1.0-5.0wt%, Re0.01-0.5wt%, P＜0.05wt%, S＜0.05wt%, surplus is an iron.This roll working layer is because higher C and alloying element cause the toughness plasticity of material poor, and thermal shock resistance is poor, and brittle rupture takes place working lining easily, thereby is not suitable for the pony roughing mill roll, can only be used for finish rolling leading portion and excellent wire roll.And outer molten steel only adopts the single rare earth processing of going bad, and modification effect is not obvious.
The disclosed rapid steel roll for hot-rolling of China CN97190674.2, its outer composition of layer is: C2.4-2.9%, Si1% are following, Mn1% following, Cr12-18%, Mo3-9%, V3-8%, Nb0.5-4%, and satisfy 0.27≤Mo (%)/Cr (%)≤0.7 and C (%)+0.2Cr (%)≤6.2 simultaneously, all the other are Fe and unavoidable impurities.Same this working lining causes the toughness plasticity of material poor because its C and alloy content are higher, and thermal shock resistance is poor, and brittle rupture takes place working lining easily, thereby is not suitable for the shaping roll working lining, and patent is reported also for being used for the back segment finishing roll.
The disclosed composite roller operational layer high-speed antiwear cast steel that is applicable to of Chinese patent CN00103223.2, chemical ingredients (weight %) is: C1.8-4.2%, W2-12%, Mo3-12%, Cr4-15%, Co0-10%, V2.5-10%, Nb0.3-2.5%, Si0.5-1.5%, Mn0.3-0.8%, Al0.2-0.6%, N0.02-0.10%, S≤0.03%, P≤0.03%, all the other are iron.Because C and alloy content are higher, cause the toughness plasticity of material poor equally, thermal shock resistance is poor, and brittle rupture takes place working lining easily, is not suitable for the shaping roll working lining.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned prior art, a kind of strip roughing heat crack resistance excellence is provided, the red hardness height, wear resistance reaches the good half high speed steel composite roller of fatigue resistance well.
Another object of the present invention is to provide a kind of preparation method of above-mentioned roll.
The general rolling pressure of pony roughing mill working roll is big, thermal shocking is big, improves the toughness plasticity of roll working lining with this relative will the lacking of add-on of this alloying element and carbon in the composition design, reduces the risk of brittle rupture.Half high speed steel composite roller of the present invention comprises working lining and spheroidal graphite cast iron core, and its feature consists of in said working lining: C1.0-2.0wt%, Si0.6-1.0wt%, Mn0.2-1.0wt%, Ni0.5-1.5wt%, Cr4.0-6.0wt%, Mo2.0-3.5wt%, V2.0-4.0wt%, W1.0-2.5wt%, Re0.01-0.1wt%, B0.03-0.08wt%, Al0.03-0.1wt%, P≤0.03wt%, S≤0.015wt%, surplus is iron and unavoidable impurities element.
Among the present invention, for adapting to the roughing mill job requirement:
Find in the alloy material increase in test along with carbon content, the also corresponding increase of the amount of carbide precipitate, the toughness of carbide is almost 0, and easy fragmentation is dropped when being squeezed in rolling process, forms formation of crack, and cracks.Therefore taked the higher speed steel to reduce the carbon content measure, carbon has been controlled at 1.0-2.0%wt%.
The increase of Mn content, the toughness of material can descend, and is more obvious to the decline of toughness of material when surpassing 1% content, so Mn content should be controlled at below the 1%wt%.
Si is a deoxidant element, can play reinforced ferrite when low levels, and Si increases the tempering resistance.But when content in steel＞1wt% is found in test, easily produce fragility, therefore preferably be controlled at 0.6-1.0%wt%.
B can obviously improve the hardening capacity of material in steel, reduce the hardness drop of working lining, but can cause that toughness of material descends during too high levels, causes the brittle rupture of roll working lining, is suitably 0.03-0.08wt%.
When Cr content hanged down, hardenability was bad, easily formed (Fe, Cr) 3C reticulated carbon thing, cause that toughness of material descends, easily crack, when greater than 7%wt% at cancellated edge, the amount of chromium carbide is excessive, can cause the obvious decline of material fracture toughness, and Cr content preferably is controlled at 4-6%wt%.
Al is general in steel to be played desoxydatoin and obtains the inherent fine grain steel, but during too high levels, can cause the obvious decline of toughness of material, and the risk of material fragility fracture strengthens, and preferably is controlled at 0.03-0.1wt%.
Mo and W and C generate M2C or M6C type carbide, and solid solution makes matrix strengthening in matrix, increase wear resistance and tempering resistance, and be too much as content, and then the M6C carbide increases, and is unfavorable to toughness and surface smoothness.In addition, the density of wolfram varbide is bigger, is easy to generate segregation at centrifugal casting process, causes that components of working layer and tissue odds are even, so Mo preferably is controlled at 2.0-3.5wt%, W preferably is controlled at 1.0-2.5wt%.
V and C generate VC, increase wear resistance, the microhardness of VC is higher, in material, distribute in pelletized form, in rolling process along with around softer matrix be worn, come out with regard to emergence, cause the change of roller surface frictional coefficient and the decline of surface smoothness, and scratch the operation of base surface and deterioration milling train easily; The density of VC is less in addition, easily produces segregation and cause the inhomogeneous of components of working layer and tissue in centrifugal casting process, and V preferably is controlled at 2.0-4.0wt%.
Re has crystal grain thinning in steel, the form and the desulfurization dephosphorization effect of control inclusion, but cause the decline of toughness of material and the deterioration of anti-fatigue performance easily during too high levels, Re preferably is controlled at 0.03-0.1%wt%.
Good metallurgical binding for fine control working lining and support core, and improving core intensity, roll of the present invention better adopts the rotational casting three-layer composite structure, be working lining, intermediate layer and core, wherein intermediate layer and core are spheroidal graphite cast iron material of the same race.
Half high speed steel composite roller preparation of the present invention; comprise melting respectively; centrifugal casting working lining and spheroidal graphite cast iron core; it is characterized in that working lining consists of: C1.0-2.0wt%; Si0.6-1.0wt%; Mn0.2-1.0wt%, Ni0.5-1.5wt%, Cr4.0-6.0wt%; Mo2.0-3.5wt%; V2.0-4.0wt%, W1.0-2.5wt%, Re0.01-0.1wt%; B0.03-0.08wt%; Al0.03-0.1wt%, P≤0.03wt%, S≤0.015wt%; surplus is iron and unavoidable impurities element; melting adds rare earth before the tapping; the silico-calcium compound modifier adds covering slag; the rotational casting working lining is then with the spheroidal graphite cast iron centrifugal casting intermediate layer and the core that melt.
Three layers of cast of the present invention, a kind of working lining that is preferably adopts sphere singly to water to chew pouring head, and the middle layer is adopted sphere to divide equally (120 °) three and is watered and chew pouring head, and core adopts cruciform to water and chews pouring head.
The present invention's test shows that the cast working lining suitably reduces liquid steel temperature, helps improving the quality of products, and test determines that the working lining teeming temperature is comparatively suitable with 1450～1460 ℃.The middle layer teeming temperature is suitably L
Liquid+ 15～25 ℃, temperature is on the low side during the cast of middle layer, and is less with working lining bonded fusion area, and the working lining of high alloy content is difficult for dissolving each other with the middle layer molten iron, helps improving core intensity.The core teeming temperature is suitably L
Liquid+ 30～40 ℃, the middle relatively floor height of core molten steel pouring temperature makes middle layer and core can reach metallurgical binding completely, and helps the core deslagging, and roll material inside metallurgical quality improves, and also helps improving core intensity.(L
LiquidRepresent the molten iron liquidus temperature)
Half high speed steel composite roller working lining of the present invention, than finish rolling rapid steel working lining, morely reduce C and alloying element, thereby increased the toughness plasticity of material, improved the thermal shock resistance and the heat resistanceheat resistant crack performance of material, and fracture toughness property, working layer is difficult for taking place brittle rupture, and anti-fatigue performance can be good, is difficult for taking place fatigue failure, be applicable to rolling mill for hot rolled planks and strips roughing working roll, and the steel rolling amount is big.
Three layers of roll employings are compound, and the middle layer helps controlling the width of key coat, and bonding strength, and the core molten iron is not being poured into a mould under the curdled appearance fully in the middle layer, with core material of the same race, can make middle layer and core can reach metallurgical binding completely, all more help improving core material intensity.
Add rare earth, silico-calcium compound modifier in the molten steel, help controlling carbide morphology, prevent that effectively carbide network in the working lining process of setting from forming and the form of inclusion changes, make tissue obtain refinement, thereby obtain good as-cast structure, make the working layer of rotary casting have higher fatigue resistance and mechanical property.
The working lining sphere is singly watered and is chewed pouring head, and steel flow can touch the casting mold internal surface rapidly reposefully, and spreads out at the casting mold internal surface rapidly, makes the hardness of cast form of roll working lining more even, and drop is little; The middle layer sphere is divided equally three and is watered and chew pouring head, and molten iron is little to the internal surface scouring force that working lining has just solidified, be difficult for forming in the part pit and working lining excessive fuse into the middle layer, and cause the mechanical properties decrease of material; The core cruciform waters chews pouring head, and molten iron slows down the impact of casting mold bottom, is difficult for dashing the casting mold of striding the bottom, can avoid anti-material to enter in the core molten iron, inclusion content in the favourable minimizing core molten iron, the metallurgical quality of raising core molten iron.
Below in conjunction with several embodiments, further specify the present invention.
Embodiment
Embodiment: adopt working lining of the present invention and method vertical centrifugal to pour into a mould five of compound semi-high speed steel roughing working rolls, five roughing working roll working lining molten steel and middle layer and core hot metal composition see Table 1, and gained vertical centrifugal composite roll processing parameter sees Table 2.
Difference melting working lining molten steel, middle layer and core molten iron in two middle frequency furnaces.The working lining molten steel adopts smelting scrap steel, after molten steel melts clearly, and the sample examination composition, the iron alloy of allocating respective amount according to the result of laboratory test of former molten steel into makes chemical ingredients reach the target component requirement.Middle layer and core magnesium iron water, adopt steel scrap and pig iron melting, after molten iron melts clearly, the sample examination composition, allocate the iron alloy of respective amount according to the result of laboratory test of base iron into and adjust its chemical ingredients to the target component requirement, and adopt rare earth silicon and magnesium and pure magnesium to carry out spheroidizing, adopt ferrosilicon to carry out inoculation (all belonging to prior art).Drop into oxygenant before the tapping of working lining molten steel and carry out oxide treatment, and in baked rare earth, silico-calcium and the aluminium block input ladle, the add-on of rare earth, silico-calcium and aluminium block is respectively 0.02～0.2wt%, 0.05～0.15wt%, the 0.05-0.2wt% of tapping weight, and (effect of rare earth and silico-calcium is dephosphorization, desulfurization, degasification and to the molten steel processing of going bad, the effect of aluminium block is to deoxidation of molten steel, and effect is to obtain the inherent fine grain steel in addition).The scarfing cinder in ladle of working lining molten steel finishes the back by 15kg/ ton steel input DLF101 covering slag (prior art), after slag to be protected and molten steel fully react, molten steel is carried out thermometric, makes liquid steel temperature begin centrifugal (vertical) cast in the time of 1450～1460 ℃.Working lining adopts Φ 60 or above sphere singly to water and chews, and carries out stopper pouring (amount is sufficient big, guarantees molten steel table expansion rapidly in casting mold rapidly, helps controlling uniformity of hardness) by usual method, makes mold temperature during cast between 80～200 ℃.When the working lining molten steel cools arrives interface temperature, begin to pour into a mould middle layer magnesium iron water, middle layer cast thickness is 50～100mm, teeming temperature is L
Liquid+ 15～25 ℃, middle layer cast is adopted Φ 45 or above sphere to divide equally three and is watered and chew cast.Cast finishes in half curdled appearance (for example 5～10 minutes), begins to pour into a mould core magnesium iron water, and the core cast is adopted cruciform to water and chewed, and teeming temperature is L
Liquid+ 30～40 ℃.After cast finishes, casting mold is hung in the holding pit internal cooling, the insulation cooling is the unpacking demoulding after 7 days, and the blank roll is carried out roughing, heat-treats after the completion of processing, carries out precision work after thermal treatment finishes.
According to the roll size, pouring head size of the present invention can change.
The test roller send the examination of A and B factory to roll respectively, and former A steel mill uses half steel roughing working roll in the hot rolling broadband, and the overall average steel transportation amount is about 180,000 tons, and high chromium steel roughing working roll is used in B steel mill hot rolling broadband, and the overall average steel transportation amount is about 280,000 tons.Adopt working lining of the present invention and method vertical centrifugal to pour into a mould five of compound semi-high speed steel roughing working rolls, wherein (1, No. 2) is offered A steel mill use; (3,4, No. 5) three offer B steel mill and use, and 1 and No. 2 the total steel transportation amount of roll reaches 57.6 ten thousand tons and 57.3 ten thousand tons respectively, and 3,4 and No. 5 the total steel transportation amount of roll reaches 60.3 ten thousand tons, 59.7 ten thousand tons and 61.2 ten thousand tons respectively, and amount of rolling is much higher than former roll.
Table 1 embodiment roll working lining, middle layer and core chemical ingredients (wt%)
| Example | The position | Chemical ingredients (wt%) | ||||||||||||
| C | Si | Mn | P | S | Cr | Mo | B | Ni | V | W | Re | Mg | ||
| 1 | Working lining | 1.21 | 0.61 | 0.45 | 0.025 | 0.011 | 5.20 | 1.82 | 0.03 5 | 0.63 | 2.74 | 1.03 | 0.02 5 | |
| Middle layer and core | 2.92 | 2.74 | 0.31 | 0.063 | 0.008 | 0.025 | 0.008 | 0.054 | ||||||
| 2 | Working lining | 1.35 | 0.80 | 0.50 | 0.021 | 0.013 | 5.80 | 1.91 | 0.05 6 | 0.85 | 2.93 | 1.12 | 0.03 1 | |
| Middle layer and core | 3.00 | 2.81 | 0.35 | 0.067 | 0.011 | 0.031 | 0.007 | 0.061 | ||||||
| 3 | Working lining | 1.30 | 0.62 | 0.55 | 0.017 | 0.010 | 5.30 | 2.00 | 0.07 2 | 0.75 | 2.84 | 1.17 | 0.02 1 | |
| Middle layer and core | 3.20 | 2.50 | 0.36 | 0.069 | 0.007 | 0.03 | 0.008 | 0.066 | ||||||
| 4 | Working lining | 1.28 | 0.79 | 0.52 | 0.021 | 0.010 | 5.10 | 1.94 | 0.04 3 | 0.88 | 2.81 | 1.12 | 0.03 2 | |
| Middle layer and core | 3.27 | 2.84 | 0.33 | 0.076 | 0.009 | 0.045 | 0.008 | 0.062 | ||||||
| 5 | Working lining | 1.24 | 0.63 | 0.50 | 0.027 | 0.013 | 5.50 | 1.93 | 0.03 8 | 0.76 | 2.95 | 1.08 | 0.02 7 | |
| Middle layer and core | 3.18 | 2.76 | 0.34 | 0.058 | 0.010 | 0.041 | 0.007 | 0.064 | ||||||
Surplus is iron and unavoidable impurities element.
Table 2 embodiment vertical centrifugal compound casting technique parameter
Claims (8)
1, half high speed steel composite roller comprises working lining and spheroidal graphite cast iron core, and its feature consists of in said working lining: C1.0-2.0wt%, Si0.6-1.0wt%, Mn0.2-1.0wt%, Ni0.5-1.5wt%, Cr4.0-6.0wt%, Mo2.0-3.5wt%, V2.0-4.0wt%, W1.0-2.5wt%, Re0.01-0.1wt%, B0.03-0.08wt%, Al0.03-0.1wt%, P≤0.03wt%, S≤0.015wt%, surplus is iron and unavoidable impurities element.
2 according to the described half high speed steel composite roller of claim 1, it is characterized in that roll is by working lining, spheroidal graphite cast iron material intermediate layer with core is compound forms.
3,, it is characterized in that the middle transition layer thickness is 50～100mm according to the described half high speed steel composite roller of claim 2.
4; the half high speed steel composite roller preparation; comprise melting respectively; centrifugal casting working lining and spheroidal graphite cast iron core; it is characterized in that working lining consists of: C1.0-2.0wt%; Si0.6-1.0wt%; Mn0.2-1.0wt%, Ni0.5-1.5wt%, Cr4.0-6.0wt%; Mo2.0-3.5wt%; V2.0-4.0wt%, W1.0-2.5wt%, Re0.01-0.1wt%; B0.03-0.08wt%; Al0.03-0.1wt%, P≤0.03wt%, S≤0.015wt%; surplus is iron and unavoidable impurities element; melting adds rare earth before the tapping; the silico-calcium compound modifier adds covering slag; the rotational casting working lining is then with the spheroidal graphite cast iron centrifugal casting intermediate layer and the core that melt.
5, according to the described half high speed steel composite roller preparation of claim 4, it is characterized in that 1450～1460 ℃ of working lining teeming temperatures.
6, according to the described half high speed steel composite roller preparation of claim 4, it is characterized in that the intermediate layer teeming temperature is L
Liquid+ 15～25 ℃.
7, according to the described half high speed steel composite roller preparation of claim 4, it is characterized in that the core teeming temperature is L
Liquid+ 30～40 ℃.
8, according to claim 4,5, the preparation of 6 or 7 described half high speed steel composite rollers, it is characterized in that pouring into a mould working lining and adopt sphere singly to water to chew pouring head, intermediate layer adopts sphere to divide equally three and waters and chew pouring head, and core adopts cruciform to water and chews pouring head.
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