Method for producing extremely-thick carbon die steel plate

A production method and steel plate technology, applied in the direction of manufacturing tools, auxiliary arrangements, metal rolling, etc., can solve the problems of increasing the manufacturing cost of extra-thick steel plates, complicated production processes, and complicated processes, so as to improve the pass rate of flaw detection and increase economic benefits , highly operable effect

Active Publication Date: 2017-05-24
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process is complicated, and the thickness specifications cannot meet the demand for extra-thick steel plates.
Publication No. CN102240894A discloses "a composite manufacturing method for extra-thick steel plates". The "high-temperature hydrogen reduction + hot rolling" method is used to produce extra-thick steel plates. Because the high-temperature hydrogen reduction process is complicated to operate, it has certain risks and reduces the process. operability, and will increase the manufacturing cost of extra-thick steel plates
[0005] To sum up, there are still the following deficiencies in the production of extra-thick steel plates using composite blanks: First, the product thickness specifications are small, which cannot meet the demand for thicker extra-thick steel plates, especially for carbon mold steel plates. The thickest thickness required can reach More than 500mm
Second, the production process is complicated, the operability is poor, and the production cost is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Three pieces of 300mm thick carbon mold steel continuous casting slabs are used to produce 420mm thick carbon mold steel plates. The melting composition is: C: 0.46%, Si: 0.23%, Mn: 0.73%, P: 0.011, S: 0.005%, Als: 0.022%.

[0023] 2. Clean the surface to be compounded and the oxide scales on the four sides of the above continuous casting slabs. After cleaning, the length difference of the three continuous casting slabs is 3.5 mm, the width difference is 2 mm, and the roughness of the surface to be compounded is 7.5 μm.

[0024] 3. Stack the processed mother blanks together, align them, and then use a vacuum electron beam welding machine to weld the composite surface of the mother blanks. The vacuum degree of the vacuum chamber during welding is 5×10 -3 Pa, welding current 200mA, welding speed 7mm / min, so that the area between the composite surfaces of the mother blank is sealed in a vacuum state, and the welded composite blank is left in a vacuum chamber for 3 hours...

Embodiment 2

[0030] 1. Three pieces of 300mm thick carbon mold steel continuous casting slabs are used to produce 500mm thick carbon mold steel plates. The weight percentages of the smelted components are: C: 0.48%, Si: 0.23%, Mn: 0.73%, P: 0.012%, S: 0.007%, Als: 0.022%.

[0031] 2. Clean the surface to be compounded and the oxide scales on the four sides of the above continuous casting slabs. After cleaning, the maximum difference in length and width of the three continuous casting slabs is 4mm and 2.5mm, and the roughness of the surface to be compounded is 7.9 μm.

[0032] 3. Stack the mother blanks that have been processed above, align them, and then use a vacuum electron beam welding machine to weld the composite surface of the mother blanks. The vacuum degree of the vacuum chamber during welding is 4.5×10 -3 Pa, welding current 400mA, welding speed 8mm / min, so that the area between the composite surfaces of the mother blank is sealed in a vacuum state, and the welded composite blank...

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Abstract

The invention provides a method for producing an extremely-thick carbon die steel plate. According to the method, roughness of the to-be-compounded surface of each mother blank is larger than 7.0 microns; a vacuum electron beam welder is adopted, and the vacuum degree of a vacuum chamber is larger than 2*10<2>Pa; spot welding is performed at first, then welding in the sequence from short edges to long edges is carried out, the welding current is 100-800mA, the speed is 6-10mm / min, and the depth of fusion is 20-60mm; a composite blank is heated, and the temperature rises at the speed of 5-10 DEG C / min below 700 DEG C; the temperature rises at the speed of 10-30 DEG C / min above 700 DEG C, and heat preservation lasts for 4-7h when the composite blank is heated to 1180-1220 DEG C; the rolling starting temperature of the composite blank is 1130-1150 DEG C, the roller speed is 16-20r / min, the rolling reduction in the first three passes is larger than 40mm, and the finished rolling temperature is higher than 900 DEG C; and as for steel plate slow cooling, a stacking mode of 'down-paving and up-covering' of the hot steel plate is adopted, the slow cooling temperature is 400-500 DEG C, and time is longer than 24h. By the adoption of the method, the thickness specification of the carbon die steel plate produced through a continuous casting can be increased to 400mm or above, and the flaw detection percent of pass and yield of the steel plate are both increased.

Description

technical field [0001] The invention belongs to the field of metal material processing, and in particular relates to a production method of a carbon mold steel plate with a thickness >400mm. Background technique [0002] Carbon mold steel represented by 45# and 50# steel can be used to manufacture plastic forming molds, mold bases, top columns and some other parts that do not require high dimensional accuracy and surface roughness. The requirements for mold steel are becoming more and more stringent, and the demand for specifications with a thickness of more than 200mm is increasing. [0003] The methods for producing extra-thick steel plates mainly include continuous casting slab direct rolling, ingot casting method, and one-way solidification method. At present, the production of carbon die steel plate is mainly carried out by the method of direct rolling of continuous casting slab. However, due to the limitation of the original thickness and compression ratio of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/38B21B47/00C22C38/02C22C38/04C22C38/06
CPCB21B1/38B21B47/00B21B2001/386C22C38/02C22C38/04C22C38/06
Inventor 李广龙李黎明于海岐
Owner ANGANG STEEL CO LTD
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