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

[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. ...

[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.

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[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.

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