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

An annealing process and technology for steel strips, applied in manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems that cold-rolled steel strips cannot meet high-strength technical requirements and plastic deformation requirements, and achieve increased elongation and processing costs. The effect of low, improved plasticity and toughness index

Inactive Publication Date: 2008-02-27
TANGSHAN JIANLONG IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 present invention relates to a chilled steel strip 1 / 10 hardness hardening and tempering process, belonging to the field of metal heat treatment technology. It is characterized by that said hardening and tempering process includes the steps of first-stage heating to 450deg.C plus or minus 10deg.C, first-stage heat-insulating and sweeping, second-stage heating to 500deg.C plus or minus 10deg.C, second-stage heat-insulating and sweeping and cooling-drawing, etc.

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 Applications(China)
IPC IPC(8): C21D1/26C21D9/52C21D11/00
Inventor 李代明
Owner TANGSHAN JIANLONG IND CO LTD
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