A manufacturing process of annealing-free medium and high carbon steel plate

A manufacturing process, medium and high carbon technology, applied in the field of steel rolling process, can solve the problems of medium and high carbon steel plate hardness reduction, double production cycle, difficulty in deep processing deformation, etc., and achieve the effect of increased elongation and high plasticity

Active Publication Date: 2014-10-15
HEBEI IRON AND STEEL
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  • 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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  • A manufacturing process of annealing-free medium and high carbon steel plate
  • A manufacturing process of annealing-free medium and high carbon steel plate
  • A manufacturing process of annealing-free medium and high carbon steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Steel mills refine qualified molten steel and continuously cast it into a slab of 72*1500mm. 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 slab is heated by a 230m tunnel-type heating furnace, and the heating temperature is 1080°C. Intermediate cooling down to 830°C, after finishing rolling and descaling, enter 5 finishing mills for rolling, the thickness of the finished product is 5.0mm, immediately enter the laminar flow cooling section after finishing rolling, cool down to 680±20°C for coiling, after coiling Heap 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 shown in Table 3.

Embodiment 2

[0016] Example 2: Steel mills refine qualified molten steel and continuously cast it into a slab of 72*1250mm. 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 slab is heated by a 230m tunnel-type heating furnace, and the heating temperature is 1090°C. Intermediate cooling down to 840°C, after finishing rolling and descaling, enter 5 finishing mills for rolling, the thickness of the finished product is 5.0mm, immediately enter the laminar flow cooling section after finishing rolling, cool down to 680±20°C for coiling, after coiling Heap 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 shown in Table 3.

Embodiment 3

[0017] Example 3: Refining qualified molten steel in a steel factory, and continuously casting it into a slab of 72*1500mm, 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 slab is heated by a 230m tunnel-type heating furnace, and the heating temperature is 1070°C. Intermediate cooling down to 810°C, after finish rolling and descaling, enter 5 finishing mills for rolling, the thickness of the finished product is 4.5mm, immediately enter the laminar flow cooling section after finishing rolling, cool down to 680±20°C for coiling, after coiling Heap 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 shown in Table 3.

[0018] Table 1

[0019]

[0020] Table 2

[0021]

[0022] table 3

[0023]

[0024] In the medium-high carbon steel plate produced by the anneali...

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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 an annealing-free medium-high carbon steel plate manufacturing process, which belongs to the technical field of steel rolling process. Background technique [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, difficulty in 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 it is a production process that can reduce the hardness of medium and high carbon steel plates. Conte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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