Method for producing sulfuric acid dew-point corrosion-resistant round steel 09CrCuSb

A dew-point corrosion and sulfuric acid-resistant technology, which is applied in the improvement of process efficiency and the manufacture of converters, etc., can solve problems such as sulfuric acid corrosion, and achieve the effect of saving energy, good use conditions and increasing service life.

Inactive Publication Date: 2015-12-30
TIANJIN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the sulfuric acid corrosion problem of the flue gas treatment system and develop a method for producing sulfuric acid dew point corrosion resistant round steel 09CrCuSb

Method used

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  • Method for producing sulfuric acid dew-point corrosion-resistant round steel 09CrCuSb
  • Method for producing sulfuric acid dew-point corrosion-resistant round steel 09CrCuSb
  • Method for producing sulfuric acid dew-point corrosion-resistant round steel 09CrCuSb

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Brand: 09CrCuSb, specification: Ф50mm, Ф65mm, rolling season: winter.

[0070] Hot metal pretreatment→top-bottom double-blowing converter→LF ladle refining→VD vacuum furnace→150mm×150mm billet continuous casting→turning cooling bed→slab slow cooling→slab inspection—heating furnace—high pressure water descaling→rough rolling→ 1# Cut head and tail → middle rolling → cooling bed → cutting to length → inspection → collection of finished products → slow cooling of finished products → storage.

[0071] The chemical composition of the finished product is shown in Table 2. The composition is qualified and meets the internal control requirements. The billet size of Φ50mm is 150×150×11350mm, and the billet size of Φ65mm is 150×150×11000mm.

[0072] Table 209CrCuSb round steel chemical composition (wt%)

[0073] 09CrCuSb

C

Si

mn

P

S

Cr

Cu

Sb

Ni

Fe

Φ50

0.09

0.34

0.51

0.013

0.006

0.91

0.30

0.07...

Embodiment 2

[0090] Grade: 09CrCuSb, specification: Ф50mm, Ф65mm, rolling season: spring.

[0091] Hot metal pretreatment→top-bottom double-blowing converter→LF ladle refining→VD vacuum furnace→150mm×150mm billet continuous casting→turning cooling bed→slab slow cooling→slab inspection—heating furnace—high pressure water descaling→rough rolling→ 1# Cut head and tail → middle rolling → cooling bed → cutting to length → inspection → collection of finished products → slow cooling of finished products → storage.

[0092] The chemical composition of the finished product is shown in Table 7, the composition is qualified and meets the internal control requirements. The billet size of Φ50mm is 150×150×11350mm, and the billet size of Φ65mm is 150×150×11000mm.

[0093] Table 709CrCuSb round steel chemical composition (wt%)

[0094] 09CrCuSb

C

Si

mn

P

S

Cr

Cu

Sb

Ni

Fe

Φ50

0.08

0.32

0.54

0.012

0.005

0.90

0.31

0.07...

Embodiment 3

[0117] Brand: 09CrCuSb, specification: Ф50mm, Ф60mm, rolling season: summer.

[0118] Hot metal pretreatment→top-bottom double-blowing converter→LF ladle refining→VD vacuum furnace→150mm×150mm billet continuous casting→turning cooling bed→slab slow cooling→slab inspection—heating furnace—high pressure water descaling→rough rolling→ 1# Cut head and tail → middle rolling → cooling bed → cutting to length → inspection → collection of finished products → slow cooling of finished products → storage.

[0119] The chemical composition of the finished product is shown in Table 12. The composition is qualified and meets the internal control requirements. The billet size of Φ50mm is 150×150×11350mm, and the billet size of Φ65mm is 150×150×11000mm.

[0120] Table 1209CrCuSb round steel chemical composition (wt%)

[0121] 09CrCuSb

C

Si

mn

P

S

Cr

Cu

Sb

Ni

Fe

Φ50

0.08

0.34

0.52

0.014

0.008

0.91

0.30

0....

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Abstract

The invention discloses a method for producing sulfuric acid dew-point corrosion-resistant round steel 09CrCuSb, wherein the method comprises the following steps: 1) reasonably determining the chemical composition and the inclusion control level of round steel 09CrCuSb; 2) determining the revolving furnace smelting process and N, H and O gas contents; 3) formulating an appropriate continuous casting secondary cooling schedule to make a casting blank keep away from a cracking temperature in a straightening zone, reasonably adopting crystallizer cooling water parameters and vibration negative slip parameters, and controlling casting blank surface cracks; and 4) determining a reasonable heating schedule and a rolling process, choosing low temperature for fast sintering, and reasonably distributing materials, so as to reduce enrichment of Cu elements on the steel surface and avoid the round steel from generating star-shaped cracks; and by controlling the rhythm of steel rolling, avoiding scratches of the round steel surface. By adding alloy elements such as Cr, Cu and Sb, a passivation film is formed on the steel surface; by formulating reasonable smelting, continuous casting and steel rolling processes, the round steel composition is effectively ensured, corrosion resistance can conform to relevant standards and requirements; and through the process, generation of the cracks of the copper-containing steel is avoided.

Description

technical field [0001] The invention belongs to the technical field of metallurgical analysis, in particular to a method for producing round steel 09CrCuSb resistant to sulfuric acid dew point corrosion. Background technique [0002] In petroleum, metallurgy, electric power, petrochemical and other industrial fields, flue gas treatment systems that use heavy oil or coal as the main industrial dye, such as air preheaters, heat exchange gas, economizers, flues, chimneys and Desulfurization devices, etc., generally encounter high sulfur content in fuel, which will generate SO after combustion 2 , some of which also generate SO 3 . SO 3 When the dew point temperature is reached, it combines with water vapor to form H 2 SO 4 , from thin to thick, causing corrosion of equipment, this phenomenon is called "sulfuric acid dew point corrosion". Different from ordinary atmospheric corrosion, it not only corrodes ordinary carbon steel, but also can corrode stainless pans, causing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60B22D11/18C21C5/28C21C7/10C21C7/076
CPCY02P10/20
Inventor 王成建刘桂华李维孔磊杨清山
Owner TIANJIN IRON & STEEL GRP
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