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Method for producing alloy plastic die steel using direct hot delivery and hot charging technique

A technology for producing plastic mold steel and alloys, which is applied in the field of medium and thick steel plates, can solve the problems of high cost and low yield, and achieve the effects of increasing yield and yield, reducing energy consumption, and shortening the production cycle

Inactive Publication Date: 2009-07-08
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The production of alloy plastic mold steel usually belongs to the field of special steel. The more professional mold steel production lines at home and abroad generally adopt the die casting method. The ingot is billeted and rolled and then heat treated. The yield is low and the cost is high.

Method used

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  • Method for producing alloy plastic die steel using direct hot delivery and hot charging technique
  • Method for producing alloy plastic die steel using direct hot delivery and hot charging technique
  • Method for producing alloy plastic die steel using direct hot delivery and hot charging technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The liquidus temperature of the molten steel with the composition shown in Table 1 is 1490°C. A billet with a cross-section of 220×1800mm is poured on the slab continuous casting machine. The superheat degree during normal pouring is controlled at 10-30°C. , the casting speed is 0.9m / min; when 10≤ΔT<25℃, the casting speed is 0.8m / min; when 25≤ΔT<30℃, the casting speed is 0.75m / min. Under the matching of the temperature and the casting speed, the solidification of the slab is realized through automatic water distribution and cooling.

[0017] Table 1 Billet Chemical Composition of Example 1, %

[0018]

[0019] Using the above process, the P20 steel billet with a section of 220×1800mm was cast on the slab continuous casting machine. The surface of the billet has no defects and does not need to be cleaned, which meets the requirements of hot delivery and hot charging of the billet.

Embodiment 2

[0021] The temperature of the steel billet during online cutting is above 850°C. After cutting, the billet is directly sent to the heating furnace through the hot-feeding roller table. At the bainite transformation temperature, the bainite transformation before entering the furnace can be avoided.

[0022] The P20 steel ingot smelted in a 100kg vacuum furnace was used to simulate the hot delivery and hot charging of the continuous casting slab. The composition of the steel ingot is shown in Table 2.

[0023] The steel ingot composition of table 2 embodiment 2, %

[0024]

[0025]

[0026] Such as figure 1 As shown, the bainite transformation temperature range of the experimental steel ingot is 300-470°C, and the bainite transformation will occur under air-cooling conditions.

[0027] 1# steel ingot is annealed at 550°C after demoulding, and the annealed cold ingot is heated in a heating furnace. The temperature in the soaking section of the heating furnace is 400-500°C...

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Abstract

A method which adopts direct hot feeding and hot charging technique for manufacturing alloy plastic mold steel belongs to the technical field of medium steel plate. The technique comprises the steps of furnace revolving, LF desulfurizing, RH vacuum degassing, continuous casting, cutting, hot feeing, hot charging and heating. The continuous casting sheet billet with thickness of 200-380mm is hot fed and hot charged into a heating furnace after wire cutting without slowly cooling or annealing. The superheat degree of continuous casing pouring is controlled to 10-30 DEG C. The pulling rate is matched with superheat degree and is controlled to 0.7-1.0m / min. The plate bank is directly fed to a heating furnace through the hot feeding roller conveyor after linear fixed-length cutting. The plate blank can be executed with the hot charging technique after linear fixed-length cutting if surface checking or other production organization problem occurs. The plate blank is hotly charged into the heating furnace at a temperature which is larger than or equal to 550 DEG C after checking out of production line. When the plate blank is charged into the heating furnace, the temperature of heating furnace is between 500 and 700 DEG C, and the temperature of preheating section is between 450 and 600 DEG C. The method of the invention has the advantages of excellent heating quality of plate blank according to the technique, shorted production period, and reduced energy consumption of heating furnace.

Description

technical field [0001] The invention belongs to the technical field of medium and heavy plate steel plates, and in particular provides a method for producing alloy plastic mold steel by adopting direct hot delivery (DHCR) and hot charging (HCR) techniques, which change the production process before steel billet rolling. The original process needs to occupy the slow cooling pit or annealing furnace, which is time-consuming and laborious to schedule. Through the optimization of the production process, the production rhythm and process flow have been changed, and the alloy plastic mold steel can achieve better heating while the production is going smoothly. quality. Background technique [0002] The production of alloy plastic mold steel usually belongs to the field of special steel. The more professional mold steel production lines at home and abroad generally adopt the die casting method. The ingot is billeted and rolled and then heat treated. The yield is low and the cost is...

Claims

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Application Information

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IPC IPC(8): B23P17/00C22C38/44
Inventor 金茹吕延春麻庆申宋增强姜中行高彩茹沈一平白学军王东柱朱志远杨建平张跃飞王立坚
Owner SHOUGANG CORPORATION
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