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Cast iron material pinch roll used for hot strip mill and manufacturing method of cast iron material pinch roll

A manufacturing method and technology for pinch rolls, which are applied in the field of roll casting, can solve problems such as cracks and wear resistance, and achieve the effects of improved wear resistance, high wear resistance, and guaranteed thermal crack resistance.

Inactive Publication Date: 2017-02-01
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain problems in the actual application process of the surfacing welding method, such as the crack problem in the surfacing welding process, and the non-wearing problem in the actual use process.

Method used

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  • Cast iron material pinch roll used for hot strip mill and manufacturing method of cast iron material pinch roll
  • Cast iron material pinch roll used for hot strip mill and manufacturing method of cast iron material pinch roll

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A pinch roll made of cast iron used in a hot strip rolling mill in this embodiment, the alloy composition and weight percentage content target of the set pinch roll is C 3.15-3.25%, Si 1.65-1.75%, Mn 0.75- 0.85%, Cr 0.65~0.75%, Ni1.85~1.95%, Mo 0.75~0.85%, P≤0.10%, S≤0.05%, and the rest are Fe and unavoidable impurities.

[0033] In this implementation, cast iron pinch rolls for hot strip mills are prepared through the steps of smelting, inoculation, spheroidization, pouring, and heat treatment. Each step is specifically,

[0034] 1) For smelting, the raw materials are placed in the induction furnace according to the proportion of the alloy composition and its weight percentage. The specific input raw materials are pig iron, scrap steel, ferromanganese, ferrochromium, ferronickel and ferromolybdenum. Electromagnetic stirring is used. Set the smelting temperature to 1400°C~1500°C, and start smelting.

[0035] 2) Inoculation and spheroidization treatment, add inoculant ...

Embodiment 2

[0041] A pinch roll made of cast iron used in a hot strip rolling mill in this embodiment, the alloy composition and weight percentage content target of the set pinch roll is C 3.55-3.60%, Si 1.95-2.00%, Mn 0.50- 0.60%, Cr 0.50~0.60%, Ni2.30~2.40%, Mo 0.95~1.00%, P≤0.10%, S≤0.05%, and the rest are Fe and unavoidable impurities.

[0042] In this implementation, cast iron pinch rolls for hot strip mills are prepared through the steps of smelting, inoculation, spheroidization, pouring, and heat treatment. Each step is specifically,

[0043] 1) For smelting, the raw materials are placed in the induction furnace according to the proportion of the alloy composition and its weight percentage. The specific input raw materials are pig iron, scrap steel, ferromanganese, ferrochromium, ferronickel and ferromolybdenum. Electromagnetic stirring is used. Set the smelting temperature to 1400°C~1500°C, and start smelting.

[0044] 2) Inoculation and spheroidization treatment, add inoculant in...

Embodiment 3

[0049] A pinch roll made of cast iron used in a hot strip rolling mill in this embodiment, the alloy composition and weight percentage content target of the set pinch roll is C 3.35-3.45%, Si 1.75-1.85%, Mn 0.50- 0.60%, Cr 0.50~0.60%, Ni1.60~1.70%, Mo 0.50~0.60%, P≤0.10%, S≤0.05%, and the rest are Fe and unavoidable impurities.

[0050] In this implementation, cast iron pinch rolls for hot strip mills are prepared through the steps of smelting, inoculation, spheroidization, pouring, and heat treatment. Each step is specifically,

[0051] 1) For smelting, the raw materials are placed in the induction furnace according to the proportion of the alloy composition and its weight percentage. The specific input raw materials are pig iron, scrap steel, ferromanganese, ferrochromium, ferronickel and ferromolybdenum. Electromagnetic stirring is used. Set the smelting temperature to 1400°C~1500°C, and start smelting.

[0052] 2) Inoculation and spheroidization treatment, add inoculant ...

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Abstract

The invention discloses a cast iron material pinch roll used for a hot strip mill. The pinch roll comprises alloy components including, by weight percent, 2.90%-3.60% of C, 1.30%-2.00% of Si, 0.40%-1.00% of Mn, 0. 50%-1.00% of Cr, 1.50%-2.50% of Ni, 0.30%-1.00% of Mo, smaller than or equal to 0.10% of P, smaller than or equal to 0.05% of S and the balance Fe and inevitable impurities. The invention further discloses a manufacturing method of the cast iron material pinch roll used for the hot strip mill. The manufacturing method includes the steps of smelting, inoculation and spheroidizing treatment, casting and heat treatment. The pinch roll can have the high wear resistance, the good heat crack resisting performance, the accident impact resisting capability and other comprehensive performance, and complex rolling conditions of the pinch roll before a reeling machine of the hot strip mill can be met.

Description

technical field [0001] The invention relates to the technical field of roll casting, in particular to a cast iron pinch roll for a hot strip mill and a manufacturing method thereof, which is used for the pinch roll before the coiler of the hot strip mill. Background technique [0002] The pinch roll is one of the key components of the steel rolling equipment. Its main function is to pull the rolled thin plate into the coiler for coiling and winding, and it also has the task of straightening and leveling the strip. When the pinch roll is working, the bending moment and contact stress of the roll surface are generally smaller than the rolling moment and contact stress of the roll on the same rolling line, but it is not replaced as frequently as the roll, and the pinch roll is only in overhaul. Can be replaced and regrinded. Due to the long time for roll change, pinch rolls are required to have higher wear resistance and service life than continuous rolling rolls. [0003] At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/08C22C37/04C22C33/10C21C1/10C21D1/26C21D5/00C21D9/38
CPCC21C1/10C21D1/26C21D5/00C21D9/38C22C33/10C22C37/04C22C37/08C22C37/10
Inventor 刘娣韩建宁朱志磊杨秀霞
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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