CN105296887A - Boiler tube and manufacturing process thereof - Google Patents

Abstract

The invention discloses a boiler tube. The boiler tube is prepared from the following components in percentage by weight: 18-22% of Cr, 5-10% of Mo, 8-10% of Ni, 1-2% of W, 13-16% of Co, 0.1-0.3% of Ti, 0.3-0.5% of Al, 0.5-1% of Zr, 0.5-2% of Cu, 0.1-0.3% of C, 0.1-0.3% of Mn, 0.01-0.03% of V, less than 0.015% of P+S and the balance of Fe and inevitable impurities. The invention further discloses a manufacturing process for the boiler tube. The manufacturing process comprises the steps of steel ingot manufacturing, uniform annealing, cross piercing and thermal treatment forming. The boiler tube disclosed by the invention is resistant to a high temperature and corrosion, and has good strength and plasticity, good stability and a long service life.

Description

A kind of boi1er tube and manufacture craft thereof

Technical field

The present invention relates to a kind of boi1er tube and manufacture craft thereof.

Background technology

Industrial Boiler is in high temperature and high pressure environment for a long time, and boi1er tube, under the effect of high-temperature flue gas and water vapor, oxidation and corrosion easily occurs, and therefore requires that boi1er tube has higher intensity, corrosion-and high-temp-resistant and structure stability.

Boi1er tube is in the market of a great variety, can select different models according to different demands, but considers for economy and security standpoint, and the performance and used life improving boi1er tube is a long-term task.

Summary of the invention

The object of this invention is to provide a kind of boi1er tube, this boi1er tube intensity is high, have very high tolerance performance, and structure stability is strong to high temperature and corrosion.

The composition of this boi1er tube is by weight percentage: Cr:18-22%, Mo:5-10%, Ni:8-10%, W:1-2%, Co:13-16%, Ti:0.1-0.3%, Al:0.3-0.5%, Zr:0.5-1%, Cu:0.5-2%, C:0.1-0.3%, Mn:0.1-0.3%, V:0.01-0.03%, P+S < 0.015%, surplus is Fe and inevitable impurity.

The manufacture craft of above-mentioned boi1er tube comprises the steps:

1) steel ingot is made: adopt continuous metal cast process to make steel ingot, then carry out homogenizing annealing, annealing temperature is 1150 DEG C, insulation 16h;

2) cross piercing: adopt the mode of cross piercing to make boi1er tube, rolling temperature is 1050 DEG C;

3) thermal treatment: carry out solid solution at the temperature of 1150 DEG C, water-cooled after insulation 30min, after being then incubated 16h at 500 DEG C, air cooling is to room temperature.

Advantage of the present invention and beneficial effect are:

1) this boi1er tube have employed Ni-Mo-Cr-Fe-W alloy, can long term operation under high temperature more than 600 DEG C and certain stress condition, the highest high temperature that can tolerate 950 DEG C;

2) have stronger resistance to corrosion, structure stability is high, and in contain hazardous substance few.

Embodiment

Below in conjunction with embodiment, the specific embodiment of the present invention is further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.

The technical scheme that the present invention specifically implements is:

A kind of boi1er tube, its composition is by weight percentage: Cr:18-22%, Mo:5-10%, Ni:8-10%, W:1-2%, Co:13-16%, Ti:0.1-0.3%, Al:0.3-0.5%, Zr:0.5-1%, Cu:0.5-2%, C:0.1-0.3%, Mn:0.1-0.3%, V:0.01-0.03%, P+S < 0.015%, surplus is Fe and inevitable impurity.

The manufacture craft of above-mentioned boi1er tube comprises the steps:

1) steel ingot is made: adopt continuous metal cast process to make steel ingot, then carry out homogenizing annealing, annealing temperature is 1150 DEG C, insulation 16h;

2) cross piercing: adopt the mode of cross piercing to make boi1er tube, rolling temperature is 1050 DEG C;

3) thermal treatment: carry out solid solution at the temperature of 1150 DEG C, water-cooled after insulation 30min, after being then incubated 16h at 500 DEG C, air cooling is to room temperature.

The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (2)

1. a boi1er tube, is characterized in that, composition is by weight percentage: Cr:18-22%, Mo:5-10%, Ni:8-10%, W:1-2%, Co:13-16%, Ti:0.1-0.3%, Al:0.3-0.5%, Zr:0.5-1%, Cu:0.5-2%, C:0.1-0.3%, Mn:0.1-0.3%, V:0.01-0.03%, P+S < 0.015%, surplus is Fe and inevitable impurity.

2. a manufacture craft for boi1er tube as described in claim 1, is characterized in that, comprises the steps:

1) steel ingot is made: adopt continuous metal cast process to make steel ingot, then carry out homogenizing annealing, annealing temperature is 1150 DEG C, insulation 16h;

2) cross piercing: adopt the mode of cross piercing to make described boi1er tube, rolling temperature is 1050 DEG C;

3) thermal treatment: carry out solid solution at the temperature of 1150 DEG C, water-cooled after insulation 30min, after being then incubated 16h at 500 DEG C, air cooling is to room temperature.