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Hot work die steel H13 and continuous casting and rolling manufacturing process thereof

A technology of hot work die steel and manufacturing process, which is applied in the field of steel manufacturing, can solve the problems of high viscosity of molten steel, unqualified round steel flaw detection, high alloy content, etc., and achieve the effect of reducing slag after tapping

Inactive Publication Date: 2021-11-30
JIANGSU LIANFENG ENERGY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The content of H13 alloy is relatively high, the central looseness and shrinkage cavity of continuous casting round billet and round steel are more serious than that of general steel, especially the influence of V content, which is about 1.0%, resulting in high viscosity of molten steel and insufficient feeding during solidification, which is the cause The direct cause of unqualified flaw detection of round steel

Method used

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  • Hot work die steel H13 and continuous casting and rolling manufacturing process thereof
  • Hot work die steel H13 and continuous casting and rolling manufacturing process thereof
  • Hot work die steel H13 and continuous casting and rolling manufacturing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 Shown, the production process of H13 continuous casting and rolling round of the present invention is shown in the appendix figure 1 , including the following steps:

[0036] Step S1, molten steel smelting: the blast furnace smelts coke and ore into molten iron, then puts molten iron and steel scrap into the electric furnace, blows oxygen into the molten pool of the electric furnace, adds lime to form slag, and the proportion of molten iron mixed into the electric furnace is not less than the total amount of molten iron and steel scrap. 85% of the quality. When the temperature is 1560°C, the phosphorus content in the steel is removed by slag replacement and furnace door slag flow. The mass ratio of tapping carbon is controlled at 0.10-0.15%, and the mass ratio of tapping phosphorus is controlled below 0.005%. The steel is tapped at the eccentric bottom of the furnace. When the molten steel reaches 1 / 4 of the ladle, lime, metal manganese, and low Ca...

Embodiment 2

[0053] A manufacturing process of high-quality hot work die steel H13 continuous casting and rolling round, its chemical composition, smelting method, and rolling process are all the same as in Example 1, the differences are as follows:

[0054] (1) if figure 2 The specification of continuous casting round billet is The casting speed is 0.65m / min, using the combination of M-EMS, S-EMS, and F-EMS, the parameters are: 250A / 2Hz, 200A / 8Hz, 1100A / 8Hz, in which S-EMS adopts forward and reverse rotation, and stops in the middle The time is 12 seconds. The samples were taken from the continuous casting tundish, and the chemical composition is shown in Table 4.

[0055] Table 4 Chemical composition wt%

[0056] Furnace batch number C Si mn P S Cr Ni Cu Mo V Nb Ti 3343 0.37 1.00 0.34 0.007 0.001 5.19 0.04 0.04 1.35 0.99 0.013 0.0041 Furnace batch number Al Ca B N H O Pb As sn Sb Bi ∑ five evils 3343 0.025 0.0...

Embodiment 3

[0063] A kind of manufacturing process of high-quality hot work die steel H13 continuous casting and rolling round, its chemical composition, smelting method, rolling process are all the same as Embodiment 1 and 2, the difference is as follows:

[0064] (1) The specification of continuous casting round billet is The casting speed is 0.36m / min, and the combination of M-EMS, S-EMS, and F-EMS is used. The parameters are: 250A / 2Hz, 600A / 5Hz, and 1100A / 8Hz, and the electromagnetic stirring is all forward. The samples were taken from the continuous casting tundish, and the chemical composition is shown in Table 6.

[0065] Table 6 Chemical composition wt%

[0066]

[0067]

[0068] (2) When the continuous casting slab is between 550-650°C, it is sent into the heating furnace. The actual performance of the heating furnace is shown in Table 7.

[0069] Table 7 Heating performance

[0070]

[0071] (3) After the round steel has been annealed, straightened, rolled and inspe...

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Abstract

The invention discloses a hot work die steel H13 and a continuous casting and rolling manufacturing process thereof. The continuous casting and rolling manufacturing process comprises the steps of molten steel smelting, LF refining, VD vacuum treatment, continuous casting and steel rolling, wherein the molten iron is produced through blast furnace smelting, so that the molten iron with a low content of harmful elements can be obtained, after the obtained molten steel is subjected to refining and VD vacuum treatment, molten steel containing a low content of harmful elements such as P, S, Cu, Ni, As, Sb and Sn is obtained, a continuous casting round billet with good internal quality is obtained by adopting three-stage electromagnetic stirring and setting the reasonable degree of superheat, casting speed and cooling process, a steel rod obtained through rolling is heated through four temperature sections, and then the steel rod with the compact interior and the good surface quality is obtained. Besides, the flaw detection qualification rate is greatly increased.

Description

technical field [0001] The invention relates to the technical field of iron and steel manufacturing, in particular to an H13 continuous casting round billet and continuous rolling manufacturing process for ultra-low phosphorus and ultra-low sulfur hot-working dies. Background technique [0002] H13 for hot work dies has high hardenability, good toughness and thermal cracking resistance, and the service temperature is not higher than 540 ° C. It is used to manufacture forging dies with large impact loads, hot extrusion dies, precision forging dies, Aluminum, copper and their alloy die-casting molds can also be used to make important components in the aviation industry. [0003] The content of H13 alloy is relatively high, the central looseness and shrinkage cavity of continuous casting round billet and round steel are more serious than that of general steel, especially the influence of V content, which is about 1.0%, resulting in high viscosity of molten steel and insufficien...

Claims

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Application Information

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IPC IPC(8): C22C33/06C22C38/02C22C38/04C22C38/24C22C38/06C22C38/22B22D11/115C21C7/06C21C7/064C21C7/10
CPCC22C33/06C22C38/02C22C38/04C22C38/24C22C38/06C22C38/22B22D11/115C21C7/06C21C7/064C21C7/10
Inventor 张新文江宏亮李占春孟祥岩许民朱康宁
Owner JIANGSU LIANFENG ENERGY EQUIP
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