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Cold-rolled low-temperature acid dew point corrosion resistant steel and manufacturing method thereof

A manufacturing method and acid dew point technology, which are applied to cold-rolled low-temperature acid dew point corrosion-resistant steel and its manufacturing field, and can solve problems such as inapplicability

Inactive Publication Date: 2020-08-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above steel plates are not suitable for the mixed acid corrosion environment where sulfuric acid and hydrochloric acid coexist at low temperature

Method used

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  • Cold-rolled low-temperature acid dew point corrosion resistant steel and manufacturing method thereof
  • Cold-rolled low-temperature acid dew point corrosion resistant steel and manufacturing method thereof
  • Cold-rolled low-temperature acid dew point corrosion resistant steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Chemical composition (wt%): C: 0.086, Si: 0.30, Mn: 0.48, S: 0.006, Cu: 0.26, Cr: 0.97, Mo: 0.09, Sb: 0.079.

[0067] Manufacturing method: billet hot rolling heating temperature 1230°C, finish rolling temperature 880°C, coiling temperature 660°C, cold rolling reduction rate 50%, continuous annealing temperature 800°C, holding time 90s, smoothing rate 1.2%.

[0068] Microstructure: ferrite + pearlite, pearlite content is about 10%, such as Figure 5 As shown, granular cementite is distributed at the ferrite phase boundary.

[0069] Mechanical properties: Yield strength 289MPa, tensile strength 451MPa, elongation 38.3%.

[0070] At 70°C, 50wt.%H 2 SO 4 Soaked for 24 hours, sulfuric acid corrosion resistance rate: 5.73mg / cm 2 h.

[0071] At 60°C, 11.4wt.%H 2 SO 4 +1.2wt.%HCl+1.0wt.%FeCl 3 Soaked for 24 hours, mixed acid corrosion resistance rate: 1.02mg / cm 2 h.

[0072] According to SEM and EDS analysis, there are Cu and Sb oxides in the surface corrosion layer,...

Embodiment 2

[0075] Chemical composition (wt%): C: 0.076, Si: 0.31, Mn: 0.44, S: 0.008, Cu: 0.24, Cr: 0.94, Mo: 0.05, Sb: 0.077.

[0076]Manufacturing method: Billet heating temperature during hot rolling is 1220°C, final rolling temperature is 920°C, coiling temperature is 640°C, cold rolling reduction rate is 66.7%, continuous annealing temperature is 760°C, holding time is 95s, and smoothing rate is 1.4%.

[0077] Microstructure: ferrite + pearlite, pearlite content is about 10%.

[0078] Mechanical properties: Yield strength 283MPa, tensile strength 445MPa, elongation 36.5%.

[0079] At 70°C, 50wt.%H 2 SO 4 Soaked for 24 hours, sulfuric acid corrosion resistance rate: 5.53mg / cm 2 h.

[0080] At 60°C, 11.4wt.%H 2 SO 4 +1.2wt.%HCl+1.0wt.%FeCl 3 Soaked for 24 hours, mixed acid corrosion resistance rate: 0.67mg / cm 2 h.

Embodiment 3

[0082] Chemical composition (wt%): C: 0.053, Si: 0.27, Mn: 0.59, S: 0.015, Cu: 0.35, Cr: 0.86, Mo: 0.03, Sb: 0.067.

[0083] Manufacturing method: The billet heating temperature is 1200°C during hot rolling, the final rolling temperature is 860°C, the coiling temperature is 620°C, the cold rolling reduction rate is 75%, the continuous annealing temperature is 740°C, the holding time is 110s, and the smoothing rate is 0.8%.

[0084] Microstructure: ferrite + pearlite, pearlite content is about 10%.

[0085] Mechanical properties: Yield strength 273MPa, tensile strength 431MPa, elongation 37%.

[0086] At 70°C, 50wt.%H 2 SO 4 Soaked for 24 hours, sulfuric acid corrosion resistance rate: 5.31mg / cm 2 h.

[0087] At 60°C, 11.4wt.%H 2 SO 4 +1.2wt.%HCl+1.0wt.%FeCl 3 Soaked for 24 hours, mixed acid corrosion resistance rate: 0.97mg / cm 2 h.

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Abstract

The invention discloses a cold-rolled low-temperature acid dew point corrosion resistant steel and a manufacturing method thereof. The cold-rolled low-temperature acid dew point corrosion resistant steel comprises the following chemical components of, in percentage by mass, 0.04% to 0.12% of C, 0.25% to 0.35% of Si, 0.35% to 0.65% of Mn, less than or equal to 0.035% of P, 0.005% to 0.020% of S, 0.25% to 0.40% of Cu, 0.7% to 1.2% of Cr, 0.03% to 0.10% of Mo, 0.06% to 0.12% of Sb and the balance Fe and inevitable impurity elements. Meanwhile, the element content is controlled to meet the conditions that CR is larger than or equal to 0.25 and smaller than or equal to 0.5, CR = 0.5 w (Cu) + w (Sb) + 2w (Mo), and 10w (C)-CR is smaller than or equal to 0.8. A cold-rolled steel strip with excellent low-temperature sulfuric acid and hydrochloric acid mixed acid dew point corrosion resistance is prepared through continuous casting, hot rolling, cold rolling, continuous annealing and leveling, the yield strength is larger than or equal to 260 MPa, the tensile strength is larger than or equal to 400 MPa, the elongation is larger than or equal to 30%, and the cold-rolled steel strip is suitable for low-temperature flue gas treatment, waste heat recovery and other systems for thermal power, petrifaction, metallurgy, waste incineration and the like.

Description

technical field [0001] The invention relates to a cold-rolled low-temperature acid dew point corrosion-resistant steel and a manufacturing method thereof, which can ensure excellent corrosion resistance in the environment of low-temperature sulfuric acid and hydrochloric acid mixed acid dew point, and is suitable for flue gas treatment and waste heat in firepower, petrochemical, metallurgy, and garbage incineration. Recycling and other equipment, such as flue chimneys, air preheaters, heat exchangers, dust collectors, and desulfurization towers. Background technique [0002] Fire power, petrochemical, metallurgy and waste incineration and other combustion exhaust gases are mainly composed of moisture, sulfur oxides (SO 2 , SO 3 ), HCl, NOx, CO 2 , N 2 , O 2 And so on. For flue gas treatment and waste heat recovery systems in low temperature environments, SO 2 , SO 3 , HCl combines with water to form high-soluble sulfuric acid, hydrochloric acid, etc., which severely c...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/20C22C38/22C22C38/60C21D8/02
CPCC21D8/0226C21D8/0236C21D8/0273C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/20C22C38/22C22C38/60
Inventor 阎元媛梁高飞李永灿赵顺利张清廉
Owner BAOSHAN IRON & STEEL CO LTD
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