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Continuous pickling method for hot-rolled dual-phase steel

A hot-rolled dual-phase steel and pickling technology, which is applied in the field of metallurgy, can solve the problems of complex production control, numerous procedures, and high costs, and achieve the effects of simple and easy process steps, high pickling efficiency, and improved yield strength

Active Publication Date: 2018-01-26
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The pickling methods described in the above patents are all mixed acid pickling, which has the disadvantages of high cost, heavy pollution, numerous procedures, and complicated production control.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Continuous pickling of embodiment 1C-Si-Mn-Cr series hot-rolled dual-phase steel DP600 strip

[0031] The 1650 turbulent flow continuous pickling unit is used for continuous pickling of C-Si-Mn-Cr hot-rolled dual-phase steel DP600 strip. The nominal thickness of the strip raw material is 4.0mm, the nominal width is 1290mm, and the length is 630m.

[0032] The production process is: uncoiling of hot-rolled raw materials→laser welding→phosphorus breaking by tension leveling unit→turbulent pickling→rinsing→on-line leveling→edge trimming→on-line oiling→bundling→packing and storage.

[0033] After the head and tail of the front and rear coils are welded by a plasma welding machine (can be welded between different steel bells), the phosphorus is broken by the breaking and leveling unit, and the elongation of the tension and leveling is 1.5%, and then pickled in an acid tank. 1 # ,2 # 、3 # The temperature of the acid solution in the acid tank is 60°C, 55°C, 55°C, 1 # Acid ...

Embodiment 2

[0035] Continuous pickling of embodiment 2C-Si-Mn-Cr series hot-rolled dual-phase steel DP600 strip

[0036] The 1650 turbulent flow continuous pickling unit is used for continuous pickling of C-Si-Mn-Cr hot-rolled dual-phase steel DP600 strip. The nominal thickness of the strip raw material is 4.0mm, the nominal width is 1290mm, and the length is 650m.

[0037] The production process is: uncoiling of hot-rolled raw materials→laser welding→phosphorus breaking by tension leveling unit→turbulent pickling→rinsing→on-line leveling→edge trimming→on-line oiling→bundling→packing and storage.

[0038] After the head and tail of the front and rear coils are welded by a plasma welding machine (can be welded between different steel bells), the phosphorus is broken by the breaking and leveling unit, and the elongation of the tension and leveling is 1.5%, and then pickled in an acid tank. 1 # ,2 # 、3 # The temperature of the acid solution in the acid tank is 85°C, 85°C, 75°C, 1 # Acid ...

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PUM

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Abstract

The invention relates to a pickling method for hot-rolled dual-phase steel and belongs to the field of metallurgy. The invention provides a continuous pickling method for hot-rolled dual-phase steel. The steps include: uncoiling of hot-rolled raw materials, laser welding, phosphorus breaking in a tension and straightening unit, turbulent flow pickling, rinsing and online leveling, wherein turbulent flow pickling Single-acid environment pickling is used in the process. The pickling temperature is 55-85°C. Pickling is carried out in at least three stages, and the pickling conditions of each stage are controlled as follows: During the first pickling process, the Fe2+ concentration in the pickling tank is ≤ 150g / l, the concentration of the single acid is 50~120g / l; during the second pickling process, the Fe2+ concentration in the pickling tank is ≤120g / l, and the concentration of the single acid is 60~160g / l; third During the pickling process, the Fe2+ concentration in the pickling tank is ≤80g / l, and the concentration of the single acid is 80-200g / l. The process steps are simple and easy to implement, the acid liquid can be recycled and regenerated, and has certain environmental protection. It also has the characteristics of continuous large-scale production, high pickling efficiency, and low pickling cost.

Description

technical field [0001] The invention relates to a pickling method for hot-rolled dual-phase steel, belonging to the field of metallurgy. Background technique [0002] The hot-rolled pickled sheet is made of high-quality hot-rolled sheet as raw material. The oxide layer is removed, trimmed and finished by the pickling unit. treatment) → turbulent pickling → rinsing → online leveling → trimming → online oiling → bundling → packaging and storage, the surface quality and use requirements are between hot-rolled sheets and cold-rolled sheets, which are partially hot-rolled sheets An ideal substitute for steel plates and cold-rolled plates. [0003] The dual phase steel (Dual Phase Steel, referred to as DP steel) structure is composed of ferrite (F) + martensite (M) or bainite. At present, the common hot-rolled dual phase steel strip C-Si-Mn- Cr system, C-Si-Mn-Cr-Mo system, C-Si-Mn-Mo system, C-Mn-Cr system, C-Mn-Si system and C-Si-Mn system, etc., which have excellent mechanica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/08
Inventor 汪创伟李正荣陈东旭陈天荣崔凯禹
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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