Corrosion-resistant steel pipe material for high-pressure boiler and preparation method thereof

A high-pressure boiler, corrosion-resistant technology, applied in furnaces, furnace types, heat treatment furnaces, etc., can solve the problems of reducing the unique performance of high-temperature creep stress resistance, low grain size series, production safety accidents, etc., and achieve impact toughness Good, good economic benefits, excellent corrosion resistance effect

Inactive Publication Date: 2016-01-13
安徽鼎德智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the grain size series of existing seamless steel pipes is low, which leads to the corrosion resistance and steam oxidation resistance of seamless steel pipes in high temperature environments, and at the same time reduces the unique performance of high temperature creep stress resistance, resulting in failure of high pressure boilers , causing production safety accidents and causing large economic losses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] (1) According to the chemical composition, the following mass percentages are satisfied: C0.015-0.035, Si0.4-0.6, Cr8.0-12.0, Ni3.6-5.2, Mn0.5-1.5, Sn0.3-0.6, Sb0. 2-0.4, Mo0.15-0.25, W0.1-0.2, V0.05-0.15, N0.003-0.006, P≤0.02, S≤0.01, the balance is Fe for batching; add the prepared charge to the arc Smelt in the furnace, the smelting temperature is 1570℃, after the charge is melted more than 80%, adjust the molten steel temperature to 1620℃, add 16kg / t steel slagging agent, keep the temperature for 35min, remove the slag, then adjust the temperature to 1640℃, add an appropriate amount Deoxidize the ferro-titanium and ferromanganese for 20 minutes, sample and analyze and adjust the composition. When the temperature of the molten steel reaches 1660℃, the steel can be tapped, and the aluminum cake of 1.2kg / t steel is inserted into the molten steel within 3 minutes from the furnace for final deoxidation;

[0015] (2) The molten steel is calmed in the ladle for 4 minutes and ...

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Abstract

The invention discloses a corrosion-resistant steel tube material for high-pressure boilers and a preparation method thereof. The corrosion-resistant steel tube material comprises the following chemical components in percentage by mass: 0.015-0.035% of C, 0.4-0.6% of Si, 8.0-12.0% of Cr, 3.6-5.2% of Ni, 0.5-1.5% of Mn, 0.3-0.6% of Sn, 0.2-0.4% of Sb, 0.15-0.25% of Mo, 0.1-0.2% of W, 0.05-0.15% of V, 0.003-0.006% of N, at most 0.02% of P, at most 0.01% of S and the balance of Fe. The steel tube material has the advantages of excellent corrosion resistance, excellent steam oxidation resistance, excellent stress creep properties, high high-temperature strength, favorable impact toughness and high durability, and completely satisfies the performance requirements for steel tube materials for high-pressure boilers. The production technique is simple to operate, has the advantages of low cost and favorable economic benefit, and is suitable for large-scale industrial production.

Description

Technical field [0001] The invention relates to a corrosion-resistant steel pipe material for a high-pressure boiler and a preparation method thereof, and belongs to the field of metallurgical materials. Background technique [0002] Seamless steel pipe is a round, square and rectangular steel with a hollow section and no joints on the periphery. Seamless steel pipes are made of steel ingots or solid tube billets through perforation to make capillary tubes, and then made by hot rolling, cold rolling or cold drawing. Seamless steel pipes have a hollow section and are used in large quantities as pipes for conveying fluids. Compared with solid steel such as round steel, steel pipes have the same bending and torsion strength and lighter weight. They are economical cross-section steels and are widely used in manufacturing structures. Parts and mechanical parts. Seamless steel pipes are widely used in high-pressure boilers. However, the existing seamless steel pipe has a low grain s...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22C38/60B21B37/78C21D9/08
Inventor王德志王宗义朱先玉王德泉卢秉林
Owner安徽鼎德智能科技有限公司