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Slag pot in steel mills produced by heatproof cast iron and production method thereof

A technology of heat-resistant cast iron and slag pots, which is applied in the field of slag pots for cast iron production. It can solve the problems that the slag pots cannot be filled with slag, and are prone to cracks and cracks, so as to save production costs, reduce the number of replacements, and prolong the service life. Effect

Active Publication Date: 2016-10-12
GUANGDONG ZHONGTIAN CHUANGZHAN DUCTILE IRON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the temperature of steel slag is generally 920--1340°C, the slag tank is severely oxidized, and the bottom of the slag tank will be cracked due to the repeated rapid cooling and rapid heating of steel slag. Adhering to the slag tank, so that the slag tank cannot be filled completely, thus making the slag tank invalid and scrapped
In addition, the thermal conductivity of steel is 25W / m·K, and the thermal conductivity of heat-resistant cast iron is 45--53W / m·K. It can be seen that the thermal conductivity of steel is only 50% of that of cast iron; The temperature difference is large, although the toughness of steel is good, it is more prone to cracks due to poor heat conduction

Method used

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  • Slag pot in steel mills produced by heatproof cast iron and production method thereof
  • Slag pot in steel mills produced by heatproof cast iron and production method thereof
  • Slag pot in steel mills produced by heatproof cast iron and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] like figure 1 , 2 Shown in and 3, a steelworks slag tank produced by heat-resistant cast iron includes a tank body 1, and the tank body 1 is heat-resistant cast iron, consisting of the following components in weight percent: C: 3.4%; Si: 1.8 %; Mn: 0.80%; Cr: 2.0%; Mo: 0.60%; P<0.03%; S: 0.08%; Re: 0.03%, the balance iron.

[0020] The tank body is also provided with lifting lugs 2, and the lifting lugs 2 are cast in carbon steel; the lifting lugs 2 are composed of the following components in weight percentage: C: 0.22%; Si: 0.35%; Mn: 0.55%; P<0.035%; S:<0.035%, the balance is iron, the tensile strength of the lifting lug is 550MPa, the yield strength is 345MPa, and the elongation is 40%.

[0021] In addition, the bottom of the tank body 1 is provided with a slag tank support 3 .

[0022] Its preparation method is specifically:

[0023] The mold of the slag irrigation is made of northeast pine wood, and the molding material is furan resin sand. The proportion of ea...

Embodiment 2

[0042] Such as figure 1 and 2 As shown, a steel mill slag tank produced by heat-resistant cast iron includes a tank body 1, and the tank body 1 is heat-resistant cast iron, which is composed of the following components in weight percentage: C: 3.6%; Si: 2.2%; Mn: 0.6%; Cr: 2.2%; Mo: 0.35%; P<0.03%; S: 0.1%; Re: 0.02%, the balance is iron.

[0043] The tank body is also provided with a lifting lug 2, and the lifting lug 2 is cast in carbon steel; the lifting lug 2 is composed of the following components by weight percentage: C: 0.18%; Si: 0.45%; Mn: 0.3%; P<0.035%; S:<0.035%, the balance iron.

[0044] In addition, the bottom of the tank body 1 is provided with a slag tank support 3 .

[0045] Its preparation method is specifically:

[0046] The mold of the slag irrigation is made of northeast pine wood, and the molding material is furan resin sand. The proportion of each addition is furan resin: curing agent: sand = 1.3:0.78:100, and the tensile strength of the resin sand ...

Embodiment 3

[0056] Such as figure 1 and 2 As shown, a steel factory slag tank produced by heat-resistant cast iron includes a tank body 1, and the tank body 1 is heat-resistant cast iron, which is composed of the following components in weight percentage: C: 3.5%; Si: 2.0%; Mn: 0.7%; Cr: 2.1%; Mo: 0.5%; P<0.03%; S: 0.09%; Re: 0.025%, the balance is iron.

[0057] The tank body is also provided with lifting lugs 2, and the lifting lugs 2 are cast in carbon steel; the lifting lugs 2 are composed of the following components by weight percentage: C: 0.2%; Si: 0.4%; Mn: 0.45%; P<0.035%; S:<0.035%, balance iron.

[0058] In addition, the bottom of the tank body 1 is provided with a slag tank support 3 .

[0059] Its preparation method is specifically:

[0060] The mold of the slag irrigation is made of northeast pine wood, and the molding material is furan resin sand. The proportion of each addition is furan resin: curing agent: sand = 1.3:0.78:100, and the tensile strength of the resin san...

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Abstract

The invention discloses a slag pot in steel mills produced by heatproof cast iron. The slag pot comprises a pot body, the pot body is the heatproof cast iron, and is produced by the following components by weight percentage: 3.4-3.6% of C, 1.8-2.2% of Si, 0.60-0.80% of Mn, 2.0-2.2% of Cr, 0.35-0.60% of Mo, less than 0.03% of P, 0.08-0.10% of S, 0.02-0.03% of Re, and the balance of iron. According to the invention, the slag pot in steel mills has the advantages of good thermal conductivity, strong high-temperature resistance, strong oxidation resistance, good heat fatigue resistance, and obviously-increased service life. The invention also discloses a production method of the slag pot in steel mills produced by the heatproof cast iron.

Description

technical field [0001] The invention relates to the field of slag pots for cast iron production, in particular to a steel mill slag pot produced from heat-resistant cast iron and a preparation method thereof. Background technique [0002] The large slag tank used by steel mills to hold steel slag is a consumable and vulnerable part, usually cast in one piece with carbon steel. Since the temperature of steel slag is generally 920--1340°C, the slag tank is severely oxidized, and the bottom of the slag tank will be cracked due to the repeated rapid cooling and rapid heating of steel slag. Adhering to the slag tank, so that the slag tank cannot be filled with slag, so that the slag tank becomes invalid and scrapped. In addition, the thermal conductivity of steel is 25W / m·K, and the thermal conductivity of heat-resistant cast iron is 45--53W / m·K. It can be seen that the thermal conductivity of steel is only 50% of that of cast iron; The temperature difference is large. Although...

Claims

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Application Information

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IPC IPC(8): C21B3/10C22C37/10C22C37/06C22C38/04C22C38/02C22C33/08B22D19/16
CPCB22D19/16C21B3/10C22C33/08C22C37/06C22C37/10C22C38/02C22C38/04
Inventor 柯志敏陈永成张红林初文雄
Owner GUANGDONG ZHONGTIAN CHUANGZHAN DUCTILE IRON CO LTD
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