One tenth hardness quenching and tempering and annealing technique for chilled steel strip

An annealing process and steel strip technology, which is applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems that the plastic deformation cannot be met, and the cold-rolled steel strip cannot meet the high-strength technical requirements, so as to increase the elongation and reduce the processing cost. The effect of low and short annealing cycle

Inactive Publication Date: 2009-07-01
TANGSHAN JIANLONG IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, industries such as pipe making and furniture are developing rapidly, and high-strength and high-plasticity requirements are put forward for the use of cold-rolled steel strip products. Although the hard steel belt can meet the high strength, it cannot meet the demand of plastic deformation

Method used

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  • One tenth hardness quenching and tempering and annealing technique for chilled steel strip
  • One tenth hardness quenching and tempering and annealing technique for chilled steel strip
  • One tenth hardness quenching and tempering and annealing technique for chilled steel strip

Examples

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Effect test

Embodiment 1

[0034] Example 1: Variety 08AL, specifications: thickness 0.35-0.70mm, width 430-610mm, technological process; a section of heating steel strip is heated from normal temperature to 450°C, and the heating rate is 3°C / min; a section of holding temperature is 450°C, holding time 1.5 hours, purge time 1.5 hours, purge flow 7m 3 / h; the second-stage heating steel strip continues to be heated to 500°C, the heating rate is 0.4°C / min, the second-stage holding temperature is 500°C, the holding time is 5 hours, and the purge flow rate is 8m 3 / h, and the purging time is 3 hours; the furnace is sprayed with water to cool to a temperature of 300°C, and the furnace is air-cooled to 100°C, and then it is discharged from the furnace.

Embodiment 2

[0035] Example 2: Variety Q195, specifications: thickness 0.71-1.40mm, width 610-720mm, technological process: a section of heating steel strip is heated from normal temperature to 455°C, and the heating rate is 3°C / min; a section of holding temperature is 455°C, holding time 1.8 hours, purge time 1.8 hours, purge flow 7m 3 / h; the second-stage heating steel strip continues to be heated to 505°C, the heating rate is 0.45°C / min, the second-stage holding temperature is 505°C, the holding time is 5.5 hours, and the purge flow rate is 8m 3 / h, the purging time is 3 hours; the furnace is sprayed with water to cool to a temperature of 310°C, and the furnace is air-cooled to 110°C before being discharged from the furnace.

Embodiment 3

[0036] Embodiment 3: variety Q195L, specifications: thickness 1.41-2.00 mm, width 720-830 mm. see figure 1 , process: a period of heating time is t 1 , the steel strip is heated from room temperature to temperature T 1 is 460°C, and the heating rate is 3°C / min; 2 -t 1 ) temperature T 1 460°C, holding time 2 hours, purge time 2 hours, purge flow 7m 3 / h; second stage temperature rise (t 3 -t 2 ) The steel strip continues to be heated to T 2 is 510°C, the heating rate is 0.5°C / min, the second stage (t 4 -t 3 ) holding temperature T 2 The temperature is 510℃, the holding time is 6 hours, and the purge flow rate is 8m 3 / h, the purging time is 3 hours; the furnace is sprayed with water to cool to a temperature of 305°C, and the furnace is air-cooled to a temperature of T 3 105°C, out of the oven.

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Abstract

The invention relates to a 1 / 10 hardness quenching and tempering annealing process for a chilled steel strip, which belongs to the technical field of metal heat treatment and is used to solve the problem of how to achieve high strength and high plasticity after the chilled steel strip is annealed. In particular, the method includes the first stage of heating to 450°C ± 10°C; the first stage of heat preservation and purging; the second stage of temperature rise to 500°C + 10°C; the second stage of heat preservation and purging; cooling out of the furnace and other steps. The method of the invention can be used in cold-rolled nitrogen-hydrogen and full-hydrogen bell-type bright annealing furnaces, and is suitable for quenching and tempering annealing of ordinary carbon steel, low-carbon steel and high-quality low-carbon steel chilled steel strips. The process method can eliminate the internal stress of steel strip rolling, improve the plasticity and toughness of the steel strip, and meet the use requirements of high strength and high plasticity of the steel strip. After inspection, the main mechanical property indexes of the products processed by this method are: Rockwell hardness (HRB) 80-94; tensile strength 660-720MPa. In addition, the invention also has the advantages of short annealing period and low processing cost.

Description

technical field [0001] The invention relates to an annealing method, in particular to a 1 / 10 hardness quenching and tempering annealing process for a chilled steel strip, and belongs to the technical field of metal heat treatment. Background technique [0002] The cold-rolled hard steel strip produced in the early stage can hardly be further processed due to the strong deformation strengthening effect. In recent years, in order to improve product use and meet product standard requirements, 1 / 2, 1 / 4, 1 / 8 quenching and tempering annealing is used for steel strip annealing to ensure the Rockwell hardness (HRB) value of cold-rolled steel strip products and meet the Use performance requirements, called quenching and tempering annealing. After the quenching and tempering annealing of the hardness of the chilled steel strip, the product needs to be leveled to improve the shape of the strip to meet the technical requirements for the flatness of the steel strip. [0003] At present...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/26C21D9/52C21D11/00
Inventor 伍永锐刘江伟杨海江耿素芬孟丽李代明
Owner TANGSHAN JIANLONG IND CO LTD
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