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Boron-containing semi-high speed steel cold roller and manufacturing method thereof

A technology of semi-high-speed steel and manufacturing method, which is applied in the field of steel rolling, and can solve problems such as poor hardenability and shallow hardened layer

Inactive Publication Date: 2009-04-15
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the small addition of alloy elements in the semi-high-speed steel roll, there are disadvantages of poor hardenability and shallow hardened layer

Method used

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  • Boron-containing semi-high speed steel cold roller and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The boron-containing semi-high-speed steel cold roll is smelted by a 1000 kg intermediate frequency electric furnace, and the manufacturing process steps are as follows:

[0037] 1) First, the semi-high speed steel containing boron is melted in an electric furnace, that is, scrap steel, ferrochromium, pig iron, ferrosilicon, ferromanganese, ferromolybdenum, nickel plate and copper plate are mixed and melted. When the temperature of molten steel rises to 1596 ℃, deoxidize with aluminum and alloying, then add ferrovanadium, ferroniobium, ferrotitanium and ferroboron in sequence, and heat the molten steel to 1617°C. After adjusting the composition before the furnace, pour the molten steel into the ladle, and the ladle is pre-placed with particle size 8 -10mm ferrochromium nitride.

[0038] 2) Purify molten steel by blowing argon gas at the bottom of the ladle, and the flow rate of argon gas blowing at the bottom of the ladle is 10Nm 3 / h, the argon blowing time is 8min. ...

Embodiment 2

[0046] The boron-containing semi-high-speed steel cold roll is smelted by a 1500 kg intermediate frequency electric furnace, and the manufacturing process steps are as follows:

[0047] 1) First, the semi-high speed steel containing boron is melted in an electric furnace, that is, scrap steel, ferrochromium, pig iron, ferrosilicon, ferromanganese, ferromolybdenum, nickel plate and copper plate are mixed and melted. When the temperature of molten steel rises to 1554℃, deoxidize with aluminum and alloying, then add ferrovanadium, ferroniobium, ferrotitanium and ferroboron in sequence, and heat the molten steel to 1601 °C. After adjusting the composition before the furnace, pour the molten steel into the ladle, and the ladle is pre-placed with particle size 8 -10mm ferrochromium nitride.

[0048] 2) Purify molten steel by blowing argon gas at the bottom of the ladle, and the flow rate of argon gas blowing at the bottom of the ladle is 6Nm 3 / h, the argon blowing time is 5min.

...

Embodiment 3

[0056] The boron-containing semi-high-speed steel cold roll is smelted by a 750 kg intermediate frequency electric furnace, and the manufacturing process steps are as follows:

[0057] 1) First, the semi-high speed steel containing boron is melted in an electric furnace, that is, scrap steel, ferrochromium, pig iron, ferrosilicon, ferromanganese, ferromolybdenum, nickel plate and copper plate are mixed and melted. When the temperature of molten steel rises to 1573 °C, deoxidize with aluminum. and alloying, then add ferrovanadium, ferroniobium, ferrotitanium and ferroboron in sequence, and heat the molten steel to 1612 °C. After adjusting the composition before the furnace, pour the molten steel into the ladle, and the ladle is pre-placed with particle size 8 -10mm ferrochromium nitride.

[0058] 2) Purify molten steel by blowing argon gas at the bottom of the ladle, and the flow rate of argon gas blowing at the bottom of the ladle is 12Nm 3 / h, argon blowing time 4min.

[00...

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Abstract

The invention relates to a boron-containing semi high-speed steel cold roller and a manufacturing method thereof and belongs to the field of steel rolling technology. The existing cold rollers have the problems of poor wear-resistance, high production cost and the like. The invention obtains the boron-containing semi high-speed steel cold roller by pouring the molten steel with the compositions of the following weight percentages of 0.30 to 0.45 of C, 3.8 to 4.2 of Cr, 0.2 to 0.6 of Si, 0.2 to 0.6 of Mn, 0.5 to 0.8 of Mo, 0.2 to 0.4 of Ni, 0.3 to 0.6 of Cu, 0.6 to 1.0 of B, 0.3 to 0.7 of V, 0.6 to 0.8 of Ti, 0.1 to 0.3 of Nb, 0.03 to 0.10 of N, 0.25 to 0.45 of Al, less than 0.03 of S, less than 0.04 of P and the residual quantity of Fe into an outer layer of the cold roller and adopting ductile cast iron as a core part or directly pouring the molten steel into ingots. The roller has the advantages of high hardness and intensity, good toughness and wear-resistance, simple production process, low cost, etc.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, in particular to a cold rolling roll material and a manufacturing method thereof, in particular to a boron-containing semi-high-speed steel cold rolling roll and a manufacturing method thereof. Background technique [0002] Cold rolling work rolls (often referred to as cold rolling rolls) are the main consumable parts of cold rolling mills. During the working process, due to the relatively large deformation resistance of the extruded material, the working part of the roll is subjected to strong friction and extrusion, and its quality The quality of the cold-rolled sheet plays a very important role in the quality, cost and output, so the cold-rolled roll should have high strength, hardness and wear resistance. With the development of modern cold rolling mills towards large-scale and high-speed development, the steel for cold rolling rolls has changed from traditional chromium steel series (s...

Claims

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Application Information

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IPC IPC(8): C22C38/54C21C5/52C21C7/072C21D9/38
CPCY02P10/20
Inventor 符寒光雷永平邢建东尹恩生田玉铁
Owner BEIJING UNIV OF TECH