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Production process of hot-rolled round steel 09CrCuSb with sulphuric acid dew point corrosion resistance

A technology of dew point corrosion and production process, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve problems such as sulfuric acid corrosion

Active Publication Date: 2021-05-14
TIANJIN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems existing in the prior art, the present invention provides a production process for solving the sulfuric acid corrosion problem of the flue gas treatment system and developing a sulfuric acid dew point corrosion-resistant hot-rolled round steel 09CrCuSb

Method used

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  • Production process of hot-rolled round steel 09CrCuSb with sulphuric acid dew point corrosion resistance
  • Production process of hot-rolled round steel 09CrCuSb with sulphuric acid dew point corrosion resistance
  • Production process of hot-rolled round steel 09CrCuSb with sulphuric acid dew point corrosion resistance

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Brand: 09CrCuSb, specification: Ф50mm, Ф65mm, rolling season: winter.

[0052] 150mm×150mm continuous casting billet inspection→feeding→heating furnace→high pressure water descaling→rough rolling unit→1# shearing machine cut head and tail→intermediate rolling unit→diameter measuring instrument→2# shearing machine cut scale→ Apron roller table → cooling bed → cutting to length → double roller table → three-section chain transmission and inspection → finished product collection → packaging → weighing → label → slow cooling → storage.

[0053] 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.

[0054] Table 2 Chemical composition of 09CrCuSb round steel (wt%)

[0055] 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

[0073] Grade: 09CrCuSb, specification: Ф50mm, Ф65mm, rolling season: spring.

[0074] 150mm×150mm continuous casting billet inspection→feeding→heating furnace→high pressure water descaling→rough rolling unit→1# shearing machine cut head and tail→intermediate rolling unit→diameter measuring instrument→2# shearing machine cut scale→ Apron roller table → cooling bed → cutting to length → double roller table → three-section chain transmission and inspection → finished product collection → packaging → weighing → label → slow cooling → storage.

[0075] 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.

[0076] Table 7 09CrCuSb round steel chemical composition (wt%)

[0077]

[0078]

[0079] The billet is heated in three stages. The heating system is as follows: the temperature of the preh...

Embodiment 3

[0097] Brand: 09CrCuSb, specification: Ф50mm, Ф60mm, rolling season: summer.

[0098] 150mm×150mm continuous casting billet inspection→feeding→heating furnace→high pressure water descaling→rough rolling unit→1# shearing machine cut head and tail→intermediate rolling unit→diameter measuring instrument→2# shearing machine cut scale→ Apron roller table → cooling bed → cutting to length → double roller table → three-section chain transmission and inspection → finished product collection → packaging → weighing → label → slow cooling → storage.

[0099] 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.

[0100] Table 12 Chemical composition of 09CrCuSb round steel (wt%)

[0101] 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 production process of hot-rolled round steel 09CrCuSb with sulphuric acid dew point corrosion resistance. The round steel 09CrCuSb comprises the following chemical components in percentage by weight: 0.06 percent to 0.09 percent of C, 0.26 percent to 0.38 percent of Si, 0.48 percent to 0.60 percent of Mn, 0.90 percent to 1.00 percent of Cr, 0.30 percent to 0.40 percent of Cu, 0.07 percent to 0.09 percent of Sb, less than or equal to 0.015 percent of P, less than or equal to 0.008 percent of S, less than or equal to 0.15 percent of Ni, less than or equal to 0.0060 percent of N, less than or equal to 0.0002 percent of H, less than or equal to 0.0020 percent of O, and the balance of equivalent amount of Fe. Through scientific design of the chemical components, a passive film on the surface of steel is formed, and the corrosion resistant performance meets the using requirement; suitable and effective heating, steel rolling and cooling technologies are formulated, so that production of copper-containing steel cracks is effectively avoided, the industry breakthrough of the replacement of polished materials by corrosion-resistant steel 09CrCuSb AR(as rolled) hot-rolled materials is realized, and the material yield ratio is increased by more than 5 percent.

Description

technical field [0001] The invention belongs to the technical field of metallurgical manufacture, in particular to a production process of sulfuric acid dew point corrosion-resistant hot-rolled round steel 09CrCuSb. Background technique [0002] In petroleum, metallurgy, electric power, petrochemical and other industrial fields, the flue gas treatment system that uses heavy oil or coal as the main industrial fuel, such as air preheater, heat exchange gas, economizer, flue, chimney 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 p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/16B21B15/00C22C33/04C22C38/00C22C38/02C22C38/04C22C38/42C22C38/60
CPCB21B1/16B21B15/0007C22C33/04C22C38/02C22C38/04C22C38/60C22C38/42C22C38/001Y02P70/10
Inventor 刘桂华冯治胜邓再兴李树杰
Owner TIANJIN IRON & STEEL GRP
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