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A kind of steel for enamel heat transfer element with corrosion resistance and its manufacturing method

A heat transfer element and corrosion resistance technology, applied in the field of steel materials, can solve the problems of enamel surface defects, reduced service life, devitrification, etc., and achieve the effect of good corrosion resistance, high corrosion resistance, and resistance to sulfuric acid dew point corrosion

Active Publication Date: 2017-05-31
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present application provides a corrosion-resistant steel for enamel heat transfer elements and its manufacturing method, which solves the problem that enamel surface defects may occur during the manufacturing process of enamel heat transfer elements in the prior art, and may also occur during installation and use. Partial porcelain collapse or de-ceramic phenomenon occurs, which greatly reduces the technical problem of service life

Method used

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  • A kind of steel for enamel heat transfer element with corrosion resistance and its manufacturing method
  • A kind of steel for enamel heat transfer element with corrosion resistance and its manufacturing method

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Embodiment 1

[0027] In order to solve the technical problem that the enamel heat transfer element in the prior art may produce enamel surface defects during the manufacturing process, and local chipping or devitrification may occur during installation and use, which greatly reduces the service life. A corrosion-resistant steel for enamel heat transfer elements is provided. The steel plate itself has good corrosion resistance, and at the same time, the surface of the steel plate can be coated with enamel. The enamel heat transfer element manufactured by using the steel plate of the present invention has no scale explosion and enamel adhesion Good, low pinhole rate, and still has good corrosion resistance under the condition of partial enamel damage.

[0028] The chemical composition weight percent of the steel for enamelled heat transfer elements is: C≤0.010%, Mn 0.40-0.60%, Si≤0.10%, P≤0.02%, S≤0.02%, Als 0.02%-0.06%, Cu 0.20 %~0.40%, Cr0.70%~1.10%, Sb 0.04%~0.10%, Ti 0.02%~0.05%, Nb 0.01%...

Embodiment 2

[0044] Based on the same inventive concept, the present application also provides a method for manufacturing a corrosion-resistant enamel heat transfer element steel, the method comprising the following steps:

[0045] Step S101: smelting and continuous casting into slabs, specifically including: molten iron pretreatment, converter smelting, refining and continuous casting;

[0046] Step S102: performing continuous hot rolling on the slab, wherein the heating temperature of the continuous hot rolling is 1230°C-1300°C, the finishing temperature is 850°C-950°C, and the coiling temperature is 680°C-730°C;

[0047] Step S103: continuous cold rolling, the reduction rate of the continuous cold rolling is 65%-80%;

[0048] Step S104: bell annealing, the annealing temperature is 700°C-760°C, the annealing time is 20h-30h, and the flat elongation is 0.5%-1.3%.

[0049] Specifically, before step 104, the method further includes pickling.

[0050] Specifically, after step 104, the meth...

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Abstract

The invention discloses steel for an enamel heat transfer element having corrosion resistance and a manufacturing method thereof. The steel comprises the following chemical components in percentage by weight: not more than 0.010% of C, 0.40-0.60% of Mn, not more than 0.10% of Si, not more than 0.02% of P, not more than 0.02% of S, 0.02-0.06% of Als, 0.20-0.40% of Cu, 0.70-1.10% of Cr, 0.04-0.10% of Sb, 0.02-0.05% of Ti, 0.01-0.03% of Nb, 0.01-0.03% of Ni, and the balance of Fe and inevitable impurities. As such elements as Cu, Cr, Ni, Sb and Ti are added to the steel, the metal corrosion potential is deviated to a passivation area, a compact protective film is easy to be formed on the surface, the steel is excellent in corrosion resistance in a smoke environment, and the corrosion resistance is obviously better than that of a general low-carbon steel plate; and as the contents of C and Si in the steel are reduced and such proper alloy elements as Nb and Ti are added in the steel, the microstructure is reasonably controlled, the enamel coating quality of the steel plate is effectively improved, the steel plate can be applied to the surface enamel coating production, and such surface defect problems as enamel scale explosion, foaming and pinholes easily generated in traditional acid-resistant steel are solved.

Description

technical field [0001] The invention relates to the technical field of steel materials, in particular to a steel for enamel heat transfer elements and a manufacturing method thereof. Background technique [0002] The heat transfer element in the air preheater operates in a harsh environment such as smoke and dust, and needs to have good corrosion resistance. It is generally made of Corten steel, stainless steel or enameled steel. Because enamel has excellent acid and alkali corrosion resistance, and the cost is lower than stainless steel, more and more air preheaters use enamel heat transfer elements. [0003] At present, enamel heat transfer elements are made by enamelling a certain thickness of enamel on low-carbon steel. Many invention patents of cold-rolled enamel steel sheets have been published at home and abroad, for example, Chinese invention patents CN01802486.6, CN200810200579.0, CN201010179312. 5. CN201410337333.3, etc. The composition and process design of these...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/60C21D8/02
Inventor 宋乙峰杨宏武杜蓉白会平雷泽红黄道兵董蓓涂元强
Owner 武汉钢铁有限公司
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