Tool steel roller for rolling medium-thickness plate and manufacturing method thereof

A manufacturing method and tool steel technology, which is applied in the manufacture of tools, rolls, metal rolling, etc., can solve the problems of easy thermal cracking, insufficient wear resistance of rolls, and poor surface quality, so as to avoid cracking and increase the millimetric rolling capacity , Improve the effect of wear resistance

Active Publication Date: 2014-01-22

SINOSTEEL XINGTAI MACHINERY & MILL ROLL

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AI-Extracted Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is to provide a medium plate tool steel roll and its production method to so...

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Abstract

The invention discloses a tool steel roller for rolling a medium-thickness plate and a manufacturing method thereof. The tool steel roller comprises a core part of nodular cast iron, a roller neck and a roller body work layer, wherein the roller body work layer comprises the following chemical components in percentage by weight: 1.60-2.2% of C, 0.50-1.00% of Si, 0.50-1.00% of Mn, 10.00-15.00% of Cr, 0.20-1.80% of Ni, 0.20-1.50% of Mo, 0.20-1.00% of V, less than or equal to 0.03% of S, less than or equal to 0.05% of P and the balance of Fe and unavoidable impurities. According to the tool steel roller and manufacturing method disclosed by the invention, by designing a reasonable alloy composition and processing technology, the mechanical properties of a working roller of a rolling mill are effectively improved, and the wear resistance and millimeter rolling amount of the roller are increased; moreover, the tool steel roller has good hot-crack resistance, and the working efficiency of a medium-thickness plate rolling mill can be remarkably improved.

Application Domain

RollsMetal rolling arrangements

Technology Topic

Tool steelChemical composition +8

Examples

Experimental program(5)

Example Embodiment

[0022] Example 1:

[0023] A tool steel roll for rolling medium and heavy plates, including the core and roll neck of ductile iron and the outer layer of tool steel. The alloy composition and weight percentage of the outer layer of tool steel are designed to be: C1.60~1.80 %, Si0.90~1.00%, Mn0.80~1.00%, Cr14.00~15.00%, Ni0.20~0.50%, Mo1.0~1.3%, V0.30~0.50%, S≤0.03%, P ≤0.05%, the rest is Fe and unavoidable impurities.

[0024] The manufacturing method of the tool steel roll is as follows:

[0025] a) Smelting: The working layer of the roll body is made of high-quality scrap and appropriate alloy as raw materials, and is smelted in an induction furnace at a smelting temperature of 1500℃~1600℃; the molten steel is deoxidized with aluminum before being discharged, and the amount of aluminum added is molten steel 0.5%~1% by weight, reaction temperature is 1500℃~1560℃;

[0026] The core of the roll is ductile iron, pig iron is used as raw material, smelted in a blast furnace, the smelting temperature is 1460℃~1500℃, inoculant and spheroidizing agent are added to the molten iron before the furnace, the inoculant is ferrosilicon, the addition amount is 0.4% ~0.8%, the spheroidizing agent is rare earth magnesium alloy, and the addition amount is 1%~1.3%;

[0027] b) Centrifugal casting: first cast the working layer of the roll body, the casting temperature of molten steel is 1500℃~1560℃, the speed of the centrifuge during casting is 700~800 rpm, when the molten steel of the working layer of the roll body is poured, the centrifuge speed Adjust it to 450-550 rpm, until the outer layer temperature of casting is cooled to 1350℃~1400℃;

[0028] c) Combining box casting core and roll neck: Combine the sand box where the working layer of the roll body is cast and the sand box used to cast the roll neck; cast the processed molten iron into the combined sand box, and the casting temperature is 1360℃~1420℃;

[0029] d) Boxing and sand removal: After the casting is slowly cooled in the sand box for 120 to 150 hours, open the sand box to take out the casting and clean the sand attached to the surface of the casting;

[0030] e) Preliminary heat treatment: the casting is subjected to stress relief annealing, the annealing temperature is 400 ℃ ~ 600 ℃, the holding time is 120 to 200 hours, and the furnace is cooled after the heat preservation is completed; then the size and precision required for mechanical processing;

[0031] f) Final heat treatment: heat treatment on the roll surface by differential temperature quenching, quenching temperature 800℃~1100℃, quenching holding time 2 hours~10 hours, spray cooling method; tempering temperature 450℃~550℃, tempering time A total of 150 hours to 200 hours.

[0032] Analyze the chemical composition of molten steel in step a), and obtain the chemical composition and weight percentage of molten molten steel: C1.60%, Si0.94%, Mn0.85%, Cr15.00%, Ni0 .20%, Mo1.2%, V0.31%, S0.01%, P0.03%, the rest is Fe and unavoidable impurities.

[0033] After testing, the final roll surface hardness can reach HSD75~77. Under the same experimental conditions, the line wear is 55% of the high nickel-chromium roll, which is 40% lower than that of the high-chromium iron roll. The millimeter rolling volume is high nickel-chromium 1.7 times of rolls, 1.3 times of high-chromium iron rolls.

Example Embodiment

[0034] Example 2:

[0035] The difference from Example 1 is:

[0036] The design targets for the alloy composition and weight percentage of the outer layer of tool steel are: C1.70~1.90%, Si0.80~1.00%, Mn0.70~0.90%, Cr11.00~13.00%, Ni1.50~1.80% , Mo0.20~0.50%, V0.40~0.60%, S≤0.03%, P≤0.05%, the rest is Fe and unavoidable impurities.

[0037] The amount of aluminum added during the smelting process is 0.8% of the molten steel weight, the addition amount of the inoculant is 0.5%, and the addition amount of the spheroidizing agent is 1.1%; during the centrifugal casting process, the centrifuge rotates at 750 rpm. After the molten steel in the working layer of the roll body is poured, the centrifuge speed is adjusted to 500 rpm; the annealing temperature of the preliminary heat treatment is 500 ℃, and the holding time is 180 hours; the quenching temperature of the final heat treatment is 900 ℃, and the quenching holding time is 5 hours, and it is cooled by a powerful blow Method: Tempering temperature is 520℃, tempering time is 180 hours in total.

[0038] The chemical composition of molten steel is analyzed, and the chemical composition and weight percentage of the molten molten steel are: C1.80%, Si1.0%, Mn0.80%, Cr12.40%, Ni1.80%, Mo0 .20%, V0.5%, S0.02%, P0.04%, the rest is Fe and unavoidable impurities.

[0039] After testing, the final roll surface hardness can reach HSD76-78. Under the same experimental conditions, the line wear is 60% lower than that of high nickel-chromium rolls, and 43% lower than that of high-chromium iron rolls. Millimeter rolling volume is high nickel-chromium 1.75 times of rolls, 1.4 times of high chromium iron rolls.

Example Embodiment

[0040] Example 3:

[0041] The difference from Example 1 is:

[0042] The alloy composition and weight percentage design targets of the outer layer of tool steel are: C1.80~2.00%, Si 0.70~0.90%, Mn0.60~0.80%, Cr12.00~14.00%, Ni0.80~1.10%, Mo1.30~1.50%, V0.60~0.80%, S≤0.03%, P≤0.05%, the rest is Fe and unavoidable impurities.

[0043] During the smelting process, the amount of aluminum added is 1% of the molten steel weight, the addition amount of the inoculant is 0.4%, and the addition amount of the nodulizer is 1.3%; during the centrifugal casting process, the centrifuge rotates at 700 rpm. After the molten steel is poured in the working layer of the roll body, the centrifuge speed is adjusted to 450 rpm; the annealing temperature of the preliminary heat treatment is 580°C, and the holding time is 200 hours; the quenching temperature of the final heat treatment is 1000°C, and the quenching holding time is 8 hours. Method: The tempering temperature is 500℃, and the tempering time is 170 hours in total.

[0044] Analyzing the chemical composition of molten steel, the chemical composition and weight percentage of the refined molten steel are: C1.88%, Si0.83%, Mn0.68%, Cr13.10%, Ni0.97%, Mo1 .50%, V0.7%, S0.02%, P0.04%, the rest is Fe and unavoidable impurities.

[0045] After testing, the surface hardness of the final rolls can reach HSD76~80. Under the same experimental conditions, the line wear is 64% lower than that of high nickel-chromium rolls and 48% lower than that of high-chromium iron rolls. The millimeter rolling volume is high nickel-chromium 1.9 times of rolls, 1.47 times of high-chromium iron rolls.

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PUM

Property	Measurement	Unit
Surface hardness	75.0 ~ 77.0
Surface hardness	75.0 ~ 78.0
Surface hardness	78.0 ~ 80.0
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Single-core cable insulating rubber for low-smoke and zero-halogen flame-resistant rail vehicle with rated voltage of 3000V

ActiveCN101914244ASmall compression deformationImprove mechanical propertiesRubber insulatorsInsulated cablesHalogenFlame resistance

Owner:JIANGSU JUYE CABLE

Classification and recommendation of technical efficacy words

Improve mechanical properties
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Tool steel roller for rolling medium-thickness plate and manufacturing method thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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