CN1380154A

CN1380154A - Production method of built-in water-cooling channel cast steel component

Info

Publication number: CN1380154A
Application number: CN 02103931
Authority: CN
Inventors: 于荣滨; 高英民; 段安生; 李世珺; 李世明; 贾彦明; 董清仪; 陈洪波; 刘含友; 王林平
Original assignee: Anyang Iron and Steel Group Co Ltd
Current assignee: Anyang Iron and Steel Group Co Ltd
Priority date: 2002-02-09
Filing date: 2002-02-09
Publication date: 2002-11-20
Anticipated expiration: 2022-02-09
Also published as: CN1187151C

Abstract

The production method of internal water cooling channel steel-casting is characterized by that two layers of spiral internal chill are winded round external periphery of steel pipe, in which first layer of spiral internal chill is winded round the steel pipe, and second layer of spiral internal chill is winded round first layer of spiral internal chill, at the same time, when it is poured, the low-temp. nitrogen gas is blown into the steel pipe, the nitrogen gas inlet temp. is -5- -10 deg.C, the nitrogen gas pressure is less than or equal to 0.2 MPa. After the pouring is completed, the low-temp. nitrogen gas is further blown into the steel pipe for 2-4 min. so that the steel pipe will not be melted through and can not be deformed when the molten metal whose melting point is identical to that of steel pipe is poured, therefore there is not gap or thermoresistance layer between steel pipe and base body.

Description

A kind of manufacture method of built-in water-cooling channel cast steel component

Technical field

The present invention is a kind of manufacture method of built-in water-cooling channel foundry goods, is applicable to that the aquaporin steel pipe of products such as blast furnace cooling stave, throat armour is cast into, and the water-cooled guide rail of conticaster cold bed belongs to field of material engineering technology.

Background technology

Be cast into aquaporin in steel-casting inside, not only cooling performance is good, and intensity, toughness and thermal shock resistance also all be better than other products, still, because steel pipe is cast into high-temperature liquid metal and is not solved, and hampers the widespread usage of steel-casting built-in water-cooling channel product always.At present, domestic had research unit and manufacturer being engaged in the development and research of built-in water-cooling channel cast steel component, provide the blast furnace cast steel cooling wall that a kind of matrix of being made by cast steel and cooling water pipe are formed as CN99246862.0, but it is still gapped between matrix and the water pipe, steel pipe is cast in 1550～1600 ℃ the molten steel, because of the influence of its fluid temperature, very easily with the steel pipe burn through or make it distortion, it is improper to take measures, and will reduce the heat conductivility of product greatly.

Summary of the invention

The objective of the invention is to provide a kind of manufacture method of built-in water-cooling channel cast steel component.The present invention is blown into low temperature nitrogen to steel pipe simultaneously by at steel pipe outer setting spiral internal densener when cast, thereby when making steel pipe in being cast into the metal liquid suitable with its fusing point, steel pipe is burn through, indeformable not, and steel pipe and matrix do not have gap, no thermoresistance layer.

The object of the present invention is achieved like this:

1, earlier the steel pipe cylindrical is eliminated rust;

2, twine two helical layer internal denseners on the steel pipe cylindrical, ground floor spiral internal densener is entwined with the iron wire spirality of diameter 3～4mm, and pitch is 6～8mm, and spiral internal diameter is greater than outer diameter of steel pipes 2～3mm; Second layer spiral internal densener is entwined with the wire rod spirality of diameter 5～7mm, and pitch is 10～15mm, and spiral internal diameter is greater than described ground floor spiral internal densener external diameter 3～4mm.Ground floor spiral internal densener is wrapped on the steel pipe, and second layer spiral internal densener is wrapped on the ground floor spiral internal densener;

3, the steel pipe that will be tied with the spiral internal densener is inserted in the casting sand type, and high-temperature metal liquid pouring temperature is 1550 ℃-1600 ℃, and molten metal is injected into the rising head place and waters slowly, generally arrives rising head 1/3 place, and casting sand type inclination 8～10 degree are arranged;

4, be blown into low temperature nitrogen during casting of molten metal in steel pipe, the low temperature nitrogen inlet temperature is-5～-10 ℃, is blown into nitrogen gas pressure≤0.2Mpa, after cast finishes, blows low temperature nitrogen again 2～4 minutes.

The present invention is owing to twine two helical layer internal denseners at outer wall of steel pipe, when cast high-temperature metal liquid, iron wire has stopped the thermal shock of high-temperature metal liquid to steel pipe, iron wire itself has accumulation of heat and Quench ability, make high-temperature metal liquid at the outer surface of the steel pipe crust of lowering the temperature rapidly, be coated on outer wall of steel pipe tightly with iron wire, prevented that follow-up high-temperature metal liquid to the washing away of steel pipe, having guaranteed not burn through, indeformable of steel pipe.Still exist with the iron wire form after the fusion of spiral iron wire, it impels the molten metal crust, to protect inner steel pipe not by burn through on the one hand as the intermediate layer; On the other hand, metal liquid enters internal layer by the slit between the iron wire and outer wall of steel pipe has formed good fusion, iron wire has promoted combining of molten metal and steel tube surface as skeleton, guaranteed the no gap between molten metal and the steel pipe, no thermoresistance layer, thus high thermal conductivity coefficient between steel pipe and the matrix guaranteed.Simultaneously be blown into low temperature nitrogen to steel pipe when cast, enter in the molten metal in the steel pipe as the low temperature nitrogen of cooling agent, take away heat in the steel pipe, right to use steel pipe temperature reduces, and also protects this steel pipe not melted under hot conditions.

Description of drawings

Describe the present invention below in conjunction with accompanying drawing:

Fig. 1 is the structural representation of cast steel cooling wall embodiment of the present invention.

Fig. 2 is the A-A view of Fig. 1.

Fig. 3 is steel pipe and the cutaway view of two helical layer internal denseners in cast steel substrate that is wrapped on the steel pipe.

Among the figure: 1-second layer spiral internal densener, 2-ground floor spiral internal densener, 3-steel pipe, 4-cast steel substrate.

The specific embodiment

1, steel pipe 3 cylindricals with 53mm eliminate rust;

2, twine two helical layer internal denseners 1,2 on steel pipe 3 outer walls, the iron wire spirality of ground floor spiral internal densener 2 usefulness diameter 3mm is entwined, and pitch is 7mm, and spiral internal diameter is greater than outer diameter of steel pipes 2.5mm; The wire rod spirality of second layer spiral internal densener 1 usefulness diameter 6mm is entwined, and pitch is 12mm, and spiral internal diameter is greater than described ground floor spiral internal densener 2 external diameter 3.5mm.Ground floor spiral internal densener 2 is wrapped on the steel pipe 3, and second layer spiral internal densener 1 is wrapped on the ground floor spiral internal densener 2.3 one-tenth U-shapeds of described steel pipe are cast in metallic matrix 4, and stretch out outside the matrix 4 at its U-shaped two ends, are cast into four steel pipes at matrix 4, can increase or reduce the steel pipe radical that is cast into as required.

3, the steel pipe 3 that will be tied with the spiral internal densener is inserted in the casting sand type, and high temperature cast steel liquid castable temperature is 1550 ℃, and cast steel liquid is injected into rising head 1/3 place and waters slowly, and casting sand type inclination 9 degree are arranged.

4, be blown into low temperature nitrogen during pour steel in steel pipe 3, the nitrogen inlet temperature is-8 ℃, and being blown into nitrogen gas pressure is 0.15Mpa, after cast finishes, blows low temperature nitrogen again 3 minutes.

The cast steel cooling wall that adopts the said method cast to obtain is checked, dissected, and its result is as follows:

1, through ball rate reaches 0.76 times of pipe diameter;

2, dissect the back steel pipe and do not have burn through, metaboly;

3, steel pipe, matrix, spiral internal densener fuse well, no gap, and no thermoresistance layer, so thermal conductivity factor is 48W/m ℃ basically.

4, matrix tensile strength is greater than 400N/mm ², percentage elongation reaches more than 25%, and go up on the surface and the core difference is little.

Claims

1, a kind of manufacture method of built-in water-cooling channel cast steel component is characterized in that described method is:

(1) earlier the steel pipe cylindrical is eliminated rust;

(2) twine two helical layer internal denseners on the steel pipe cylindrical, ground floor spiral internal densener is entwined with the iron wire spirality of diameter 3～4mm, and pitch is 6～8mm, and spiral internal diameter is greater than outer diameter of steel pipes 2～3mm; Second layer spiral internal densener is entwined with the wire rod spirality of diameter 5～7mm, and pitch is 10～15mm, and spiral internal diameter is greater than described ground floor spiral internal densener external diameter 3～4mm; Ground floor spiral internal densener is wrapped on the steel pipe, and second layer spiral internal densener is wrapped on the ground floor spiral internal densener;

(3) steel pipe that will be tied with the spiral internal densener is inserted in the casting sand type, and high-temperature metal liquid pouring temperature is 1550 ℃-1600 ℃, and molten metal is injected into the rising head place and waters slowly, and casting sand type inclination 8～10 degree are arranged;

(4) be blown into low temperature nitrogen during casting of molten metal in steel pipe, described low temperature nitrogen inlet temperature is-5～-10 ℃, is blown into nitrogen gas pressure≤0.2Mpa, after cast finishes, blows low temperature nitrogen again 2～4 minutes.