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Low-cost Nb-free thin-gauge sulfuric acid dew point corrosion resisting steel and production method thereof

A production method and dew point corrosion technology, which is applied in the field of metallurgy, can solve problems such as surface defects of unsuitable sulfuric acid dew point corrosion resistant steel, and achieve the effects of avoiding surface defects, reducing residues, and good surface quality

Inactive Publication Date: 2016-02-24
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to the knowledge of the inventor, the existing literature (research on the production process characteristics of 304 stainless steel hot rolling, master's thesis of Northeastern University, 2009) reported that by adjusting and optimizing the heating process system, a reasonable heating temperature control range was determined to be between 1230 and 1260 °C time, it can solve the quality defects of 304 stainless steel surface oxide scale and roll traces, but this method is not suitable for solving the surface defects of low-cost Nb-free thin gauge sulfuric acid dew point corrosion-resistant steel, in addition to increasing the heating temperature, it is also necessary to adopt an appropriate phosphorus removal process , the combination of the two can achieve the best effect

Method used

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  • Low-cost Nb-free thin-gauge sulfuric acid dew point corrosion resisting steel and production method thereof
  • Low-cost Nb-free thin-gauge sulfuric acid dew point corrosion resisting steel and production method thereof
  • Low-cost Nb-free thin-gauge sulfuric acid dew point corrosion resisting steel and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0020] This embodiment provides a method for producing 8mm low-cost, Nb-free, thin-gauge sulfuric acid dew point corrosion-resistant steel;

[0021] The chemical composition of the steel is shown in Table 1

[0022] Table 18mm steel plate composition performance (%)

[0023]

[0024] Main process steps:

[0025] Rolling: The temperature in the heating section of the heating furnace is 1219°C, the temperature in the soaking section is 1206°C, 3 passes for rough rolling and descaling (1st pass, turning pass, last pass) and 1-2 passes for finishing rolling and descaling ( 1st pass, 3rd or 4th pass), the initial rolling temperature of the first stage of rough rolling is 1088°C, the final rolling temperature is 853°C, the thickness of the intermediate billet is greater than or equal to 3 times the thickness of the finished product, and the cooling is controlled: the water inlet temperature is 753°C, and the reddening temperature 626°C, cooling bed: shorten the residence time i...

Embodiment 2

[0027] This embodiment provides a 10mm low-cost Nb-free thin-gauge sulfuric acid dew point corrosion-resistant steel production method

[0028] The chemical composition of the steel is shown in Table 2

[0029] Table 210mm steel plate composition performance (%)

[0030]

[0031] Main process steps:

[0032] Rolling: heating furnace heating section temperature 1220°C, soaking section temperature 1220°C, rough rolling descaling 3 passes (1st pass, turning pass, last 1 pass) finish rolling descaling pass 1-2 ( 1st pass, 3rd or 4th pass), the starting temperature of rough rolling stage I is 1100°C, the final rolling temperature is 834°C, and the thickness of the intermediate billet is greater than or equal to 3 times the thickness of the finished product.

[0033] Controlled cooling: water inlet temperature is 773°C, red return temperature is 601°C. Cooling bed: shorten the residence time in the cooling bed, and the steel plate can be rolled off the production line quickly....

Embodiment 3

[0035] This embodiment provides a 12mm low-cost Nb-free thin specification sulfuric acid dew point corrosion-resistant steel production method

[0036] The chemical composition of the steel is shown in Table 3

[0037] Table 312mm steel plate composition performance (%)

[0038]

[0039] Main process steps:

[0040] Rolling: The temperature in the heating section of the heating furnace is 1232°C, the temperature in the soaking section is 1210°C, 3 passes for rough rolling and descaling (1st pass, turning pass, last 1 pass) and 1-2 passes for finishing rolling and descaling ( 1st pass, 3rd or 4th pass), the starting temperature of rough rolling stage I is 1112°C, the final rolling temperature is 840°C, the thickness of the intermediate billet is greater than or equal to 3 times the thickness of the finished product, and the cooling is controlled: the water inlet temperature is 772°C, and the reddening temperature 612°C, cooling bed: shorten the residence time in the coolin...

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Abstract

The invention provides low-cost Nb-free thin-gauge sulfuric acid dew point corrosion resisting steel. The steel is characterized by comprising the following elements in percentage by mass: smaller than or equal to 0.12% of C, smaller than or equal to 0.55% of Si, 0.75% to 1.20% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.025% of S, 0.50% to 1.2% of Cr, 0.20% to 0.50% of Cu, smaller than or equal to 0.25% of Ni, 0.05% to 0.15% of Sb, smaller than or equal to 0.025% of Ti, smaller than or equal to 0.010% of V, 0.020% to 0.050% of Alt and 0.0005% to 0.0035% of Ca. The tissues of the steel disclosed by the invention are ferrite and pearlite; the heating temperature is increased; generation of relatively thick iron oxide scale is facilitated; transient temperature reduction of the surface iron oxide scale is increased during descaling of high-pressure water, so that shrinkage of the surface iron oxide scale is intensified, the iron oxide scale is easier to remove from a base body, the descaling efficiency is improved, and iron oxide scale residues are fundamentally reduced.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a low-cost Nb-free thin gauge sulfuric acid dew point corrosion-resistant steel and a production method thereof. Background technique [0002] In order to achieve the strength requirement of 345MPa yield strength, the traditional process uses controlled rolling and Nb microalloying elements to carry out fine-grain strengthening to increase strength. However, as the steel industry market continues to weaken, steel prices plummet, and alloy elements should be appropriately reduced. The production cost can be reduced to a certain extent by reducing the content or improving the process. The development of a low-cost Nb-free thin-gauge sulfuric acid dew point corrosion-resistant steel and its production method is very important for how to effectively reduce the cost. [0003] Sulfuric acid dew point corrosion-resistant steel contains alloying elements such as Mn, Cr, Cu, Sb, etc. During the he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C21D8/02
Inventor 秦玉荣王军
Owner NANJING IRON & STEEL CO LTD
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