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Annealing-free medium-high carbon steel plate making technology

A manufacturing process, medium and high carbon technology, applied in the field of steel rolling process, can solve the problems of reduced hardness of medium and high carbon steel plates, doubled production cycle, large wear of processing equipment, etc., to achieve the effect of increased elongation and high plasticity

Active Publication Date: 2013-06-26
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Since medium and high carbon steel plates are mainly used to manufacture cutting tools and hardware tools, during the deep processing of products, there are generally problems such as high material hardness, difficult deep processing deformation, and large wear and tear of processing equipment.
It is generally believed that spheroidizing annealing is the best process to reduce the hardness of medium and high carbon steel, but it is accompanied by problems such as increased production costs, doubled production cycles, and difficulty in quality assurance during heat treatment. This field is in urgent need of a method that can eliminate the annealing process. And the production process that can reduce the hardness of medium and high carbon steel plates

Method used

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  • Annealing-free medium-high carbon steel plate making technology
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  • Annealing-free medium-high carbon steel plate making technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: The steel mill refines qualified molten steel and continuously casts into 72*1500mm slabs. The chemical composition is C: 0.48%, Si: 0.22%, Mn: 0.70%, P: 0.012%, S: 0.007%, Als: 0.020 %, the balance is Fe; the continuous casting billet is heated by a 230m tunnel heating furnace, the heating temperature is 1080 ℃, and the billet is rough-rolled and descaled after being discharged into the two rough rolling mills. The total rough rolling reduction rate is 65%. Intermediate cooling down to 830℃, after finishing rolling and descaling, it enters 5 finishing rolling mills for rolling. The thickness of the finished product is 5.0mm. After finishing rolling, it enters the laminar cooling section and the temperature is reduced to 680±20℃ for coiling. Pile cold. The chemical composition is listed in Table 1, the process parameters are listed in Table 2, and the mechanical properties and hardness of the finished product are listed in Table 3.

Embodiment 2

[0016] Example 2: The steel mill refines qualified molten steel and continuously casts into 72*1250mm slabs. The chemical composition is C: 0.49%, Si: 0.20%, Mn: 0.72%, P: 0.010%, S: 0.006%, Als: 0.022 %, the balance is Fe; the continuous casting billet is heated by a 230m tunnel heating furnace, the heating temperature is 1090℃, and the billet is rough-rolled and descaled after being discharged into the two rough rolling mills. The total rough rolling reduction rate is 65%. Intermediate cooling down to 840℃, after finishing rolling and descaling, it enters 5 finishing rolling mills for rolling. The thickness of the finished product is 5.0mm. After finishing rolling, it enters the laminar cooling section to cool down to 680±20℃ for coiling. Pile cold. The chemical composition is listed in Table 1, the process parameters are listed in Table 2, and the mechanical properties and hardness of the finished product are listed in Table 3.

Embodiment 3

[0017] Example 3: The steel mill refines qualified molten steel and continuously casts 72*1500mm slabs. The chemical composition is C: 0.51%, Si: 0.25%, Mn: 0.72%, P: 0.010%, S: 0.008%, Als: 0.024 %, the balance is Fe; the continuous casting billet is heated by a 230m tunnel heating furnace, the heating temperature is 1070℃, and the billet is rough-rolled and descaled after being discharged into the two roughing mills. The total roughing reduction rate is 65%. Intermediate cooling down to 810℃, after finishing rolling and descaling, it enters 5 finishing rolling mills for rolling. The thickness of the finished product is 4.5mm. After finishing rolling, it enters the laminar cooling section to cool down to 680±20℃ for coiling. Pile cold. The chemical composition is listed in Table 1, the process parameters are listed in Table 2, and the mechanical properties and hardness of the finished product are listed in Table 3.

[0018] Table 1

[0019]

[0020] Table 2

[0021]

[0022] tab...

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Abstract

The invention relates to an annealing-free medium-high carbon steel plate making technology, and belongs to the technical field of steel rolling technologies. A technical scheme adopted in the invention is characterized in that the technology comprises the operations of heating furnace heating, vertical roll rolling, roughing scale removal, roughing rolling, intermediate cooling, precision rolling scale removal, precision rolling, laminar cooling, reeler reeling and concentrated pile cooling, the intermediate cooling operation is carried out after the roughing rolling operation and before the precision rolling scale removal operation and is realized through cooling plate blanks by a cooling device, and the cooling capability of the cooling device makes the temperature of the plate blanks decrease to below 840DEG C. The technology has the following beneficial effects: the elongation rate after fracture of produced products obviously rises, the hardness of the products decreases by 7.2-21%, the proportion of ferrite in the structure of the products is above 60%, ferrite crystal grains are appropriately coarsened, the pearlite colony is small and dispersed, and the cementite sheet in pearlite is attenuated, fragmented and partially granulated. An annealing operation after rolling can be avoided because of the low hardness and high plasticity in order to reach an online softening purpose.

Description

Technical field [0001] The invention relates to a process for manufacturing an annealing-free medium-high carbon steel sheet, belonging to the technical field of steel rolling. Background technique [0002] Since medium and high carbon steel plates are mainly used to manufacture cutting tools and hardware tool parts, in the deep processing of products, problems such as high hardness of materials, difficulty in deep processing deformation, and large wear of processing equipment are common. It is generally believed that spheroidizing annealing is the best process for reducing the hardness of medium and high carbon steels. However, it is accompanied by increased production costs, doubling of production cycles, and difficulty in quality assurance during heat treatment. There is an urgent need in this field to eliminate the annealing process. And it can reduce the hardness of medium and high carbon steel plate. Summary of the invention [0003] The purpose of the present invention is ...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/00
Inventor 王云阁陈礼斌杨晓江刘丽萍马春红王春峰汪云辉吕长宝褚春光贾军艳李梦英张冬宇杨杰
Owner HEBEI IRON AND STEEL
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