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Plastic mold steel 718 and production process thereof

A technology of plastic mold steel and production process, which is applied in the field of iron and steel smelting, can solve the problems of not being able to meet the performance requirements of plastic mold steel 718, and can not be applied to plastic mold steel 718, and achieve the effect of improved production technology and excellent comprehensive performance

Active Publication Date: 2018-03-13
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice shows that this production method is only suitable for low-alloy high-strength steel, and cannot be applied to the production of plastic mold steel 718, let alone meet the performance requirements of plastic mold steel 718

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 7

[0045] A kind of production technology of plastic mold steel 718, carry out according to the following steps:

[0046] a. Desulphurization of KR molten iron: Slag removal treatment is carried out on the molten iron at the station. It is required to completely remove the slag from the front and rear, and the S content in the molten iron after desulphurization is 0.002%;

[0047] b. Converter smelting: The temperature of the molten iron in the furnace is 1300°C. During the smelting process, high-Cr, high-Mo and high-Ni alloy scrap steel is added. More than 2 times, to avoid slag during the tapping process;

[0048] c. LF refining: use high iron oxide mixed slag, the mass percentage composition of the high iron oxide mixed slag is: 70% iron oxide and 30% fluorite, add 800kg of lime, control the temperature at 1620°C, and make the steel The liquid reacts fully with the slag surface, and the P content of the finished product is controlled below 0.003%;

[0049] d. VD vacuum treat...

Embodiment 8

[0059] A kind of production technology of plastic mold steel 718, carry out according to the following steps:

[0060] a. Desulphurization of KR molten iron: Slag removal treatment is carried out on the molten iron at the station. It is required to completely remove the slag from the front and rear, and the S content in the molten iron after desulphurization is 0.002%;

[0061] b. Converter smelting: the temperature of molten iron entering the furnace is 1330°C, high-Cr, high-Mo and high-Ni alloy scraps are added during the smelting process, the steel is tapped according to the mass percentage C0.15%, P0.012%, S0.003%, and the number of spot blowing is different More than 2 times;

[0062] c. LF refining: use high iron oxide mixed slag, the mass percentage composition of the high iron oxide mixed slag is: 60% iron oxide and 40% fluorite, add 600kg of lime, control the temperature at 1590°C, and make the steel The liquid reacts fully with the slag surface, and the P content of...

Embodiment 9

[0072] A kind of production technology of plastic mold steel 718, carry out according to the following steps:

[0073] a. Desulfurization of KR molten iron: Slag removal treatment is carried out on the molten iron at the station. It is required that the front and rear slags are completely removed, and the S content in the molten iron after S removal is 0.003%;

[0074] b. Converter smelting: the temperature of molten iron entering the furnace is 1315°C, high-Cr, high-Mo and high-Ni alloy scraps are added during the smelting process, the steel is tapped according to the mass percentage C0.12%, P0.012%, S0.004%, and the number of spot blowing is different More than 2 times;

[0075] c. LF refining: use high iron oxide mixed slag, the mass percentage composition of the high iron oxide mixed slag is: 80% iron oxide and 20% fluorite, add 400kg of lime, control the temperature at 1600°C, and make the steel The liquid reacts fully with the slag surface, and the P content of the fini...

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PUM

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Abstract

The invention provides plastic mold steel 718 and a production process thereof, and relates to the technical field of steel and iron smelting. The plastic mold steel 718 comprises the following chemical components in percentage by mass: 0.37-0.40% of C, 0.4-0.5 of Si, 1.4-1.5 of Mn, 1.8-2.0 of Cr, 0.4-0.5 of Mo, 1.0-1.1 of Ni, P not more than 0.008, S not more than 0.003, 0.018-0.030 of Als, and the balance of Fe and residual elements; and the thickness is 150 mm. The plastic mold steel 718 is excellent in mechanical performance, high in strength and excellent in impact resistance.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a plastic mold steel 718 and a production process thereof. Background technique [0002] 718 die steel is a brand of pre-hardened hot work die steel. This steel has excellent mechanical properties and machinability, and is widely used in the mold industry, especially in the field of plastic mold processing and production. In addition, its special production process makes 718 mold steel already have a hardness of 330~370HBW when it leaves the factory, so it can reduce the heat treatment link in the normal mold processing and production and improve economic benefits. Except that it cannot be used for plastic mold parts with corrosion resistance requirements, it is currently the most widely used typical steel grade for general-purpose plastic mold steel. Often referred to as "advanced" plastic mold steel, it is often used as a comparison model for newly developed ne...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C21D8/02C21D1/28C21C7/10C21C5/28
CPCC21C5/28C21C7/10C21D1/28C21D8/0205C21D8/0226C22C38/02C22C38/04C22C38/06C22C38/44Y02P10/20
Inventor 朱书成李亮许少普李忠波张涛杨阳杨东唐郑磊刘庆波张占杰符可义朱先兴薛艳生庞百鸣于飒董真真袁少威袁永旗石教兴蒋鹏袁继恒康文举
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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