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Supporting steel pipe of high-temperature equipment, and production method thereof

A technology of high-temperature equipment and production method, applied in the field of high-temperature smelting, can solve problems such as long supply period, high price, product quality problems, etc., and achieve the effects of stable size and quality, improved anti-oxidation performance, and improved durable performance

Inactive Publication Date: 2017-09-12
HEFEI MINGYOU HIGH TEMPERATURE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the high-temperature-resistant and high-pressure steel pipes used by domestic boiler manufacturers are mainly supplied from abroad. Foreign manufacturers mostly use periodic pipe rolling, which not only has low production efficiency, but also has serious problems in product quality. At the same time, the supply period is long and the price is expensive. , seriously restricting the development of my country's electric power industry
In China, the method of forging and boring is used to produce steel pipes. Although it can ensure the removal of defects in the center of the pipe blank, the yield of this method is quite low, so it is only suitable for the production of thick-walled steel pipes. At the same time, the internal defects of the pipe body cannot be eliminated, and the quality of the steel pipes is improved If it is not guaranteed, the durable strength often cannot meet the standard requirements, which seriously restricts its development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A steel pipe for high temperature equipment, the steel pipe is composed of the following elements by weight percentage: C: 0.12%, Si: 0.30%, Mn: 0.45%, P: 0.01%, S: 0.006%, Ni: 0.12%, Cr: 5.25%, Mo: 0.90%, Cu: 0.07%, Al: 0.05%, V: 0.26%, Nb: 0.06%, Ti: 0.008%, N: 0.06%, and the balance is Fe.

[0024] The production method of the above-mentioned high temperature equipment supporting steel pipe includes the following steps:

[0025] (1) Select high-quality scrap or return material and sponge iron or molten iron as raw materials for steelmaking according to the above-mentioned weight percentages, and melt them in an electric arc furnace at 1600°C, and perform rough adjustment of the composition; the molten steel is refined outside the furnace by feeding silicon calcium The barium deoxidizer is used to deoxidize to reduce the generation of inclusions in the molten steel; then the molten steel is vacuum treated with VD for 15 minutes to ensure that the inclusions are fully float...

Embodiment 2

[0029] A steel pipe for high temperature equipment, the steel pipe is composed of the following elements by weight percentage: C: 0.10%, Si: 0.28%, Mn: 0.45%, P: 0.01%, S: 0.007%, Ni: 0.09%, Cr: 4.50%, Mo: 0.92%, Cu: 0.07%, Al: 0.05%, V: 0.24%, Nb: 0.05%, Ti: 0.007%, N: 0.06%, and the balance is Fe.

[0030] The production method of the above-mentioned high temperature equipment supporting steel pipe includes the following steps:

[0031] (1) Select high-quality scrap or return material and sponge iron or molten iron as raw materials for steelmaking according to the above-mentioned weight percentages, melt them in an electric arc furnace at 1700°C, and perform rough adjustment of the composition; the molten steel is refined outside the furnace by feeding silicon calcium The barium deoxidizer is used for deoxidation to reduce the generation of inclusions in the molten steel; then the molten steel is vacuum treated with VD for 10 minutes to ensure that the inclusions float fully, and...

Embodiment 3

[0035] A steel pipe for high temperature equipment, the steel pipe is composed of the following elements by weight percentage: C: 0.15%, Si: 0.35%, Mn: 0.44%, P: 0.01%, S: 0.009%, Ni: 0.13%, Cr: 5.60%, Mo: 1.0%, Cu: 0.06%, Al: 0.05%, V: 0.27%, Nb: 0.03%, Ti: 0.009%, N: 0.08%, and the balance is Fe.

[0036] The production method of the above-mentioned high temperature equipment supporting steel pipe includes the following steps:

[0037] (1) Select high-quality scrap or return material and sponge iron or molten iron as raw materials for steelmaking according to the above-mentioned weight percentages, melt them in an electric arc furnace at 1700°C, and perform rough adjustment of the composition; the molten steel is refined outside the furnace by feeding silicon calcium The barium deoxidizer is used for deoxidation to reduce the generation of inclusions in the molten steel; then the molten steel is vacuum treated with VD for 20 minutes to ensure that the inclusions float fully, and ...

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PUM

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Abstract

The invention discloses a supporting steel pipe of high-temperature equipment, and a production method thereof. The steel pipe comprises: by weight, 0.10-0.16% of C, 0.26-0.35% of Si, 0.42-0.48% of Mn, 0.01-0.03% of P, 0.005-0.01% of S, 0.08-0.15% of Ni, 3.84-6.58% of Cr, 0.85-1.06% of Mo, 0.05-0.13% of Cu, 0.02-0.06% of Al, 0.20-0.28% of V, 0.02-0.08% of Nb, 0.005-0.01% of Ti, 0.03-0.09% of N and the balance Fe. The production technology of the steel pipe comprises the steps of VD vacuum treatment, argon blowing protection, pipe blank sizing, true fire tempering and other energy-saving and environmental-protection steelmaking procedures, and the temperature of heating, casting and calcination is controlled accurately, so that the size and stable quality of the steel pipe are ensured. The steel pipe disclosed by the invention is high in high-temperature resistance, toughness, endurance strength and oxidation resistance, and applicable to high-temperature and high-pressure environment, such as 600-700 DEG C and 30-40 MPa, and suitable as supporting steel pipes of high-temperature equipment, such as boilers and steam engines.

Description

Technical field [0001] The invention relates to the technical field of high-temperature smelting, in particular to a steel pipe supporting high-temperature equipment and a production method thereof. Background technique [0002] Heat-resistant steel refers to alloy steel with high strength and good chemical stability at high temperatures. It includes two types of anti-oxidation steel (or non-skinned steel at high temperature) and hot-strength steel. Anti-oxidation steel generally requires better chemical stability, but bears lower loads. Hot-strength steel requires higher high-temperature strength and corresponding oxidation resistance. Heat-resistant steel is often used to manufacture parts and components that work at high temperatures in industrial sectors such as boilers, steam turbines, power machinery, industrial furnaces, and aviation and petrochemical industries. In addition to high-temperature strength and high-temperature oxidation and corrosion resistance, these part...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/42C22C38/06C22C38/46C22C38/48C22C38/50C21D8/10C21C7/06C21C7/10
CPCC22C38/02C21C7/06C21C7/10C21D8/105C22C38/001C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 王虎
Owner HEFEI MINGYOU HIGH TEMPERATURE TECH CO LTD
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