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Sulfur-containing ferritic stainless steel and manufacturing method thereof

A manufacturing method and stainless steel technology, applied in the field of stainless steel smelting and hot working, can solve the problems of poor transverse mechanical properties of free-cutting ferritic stainless steel, and achieve the effects of improving transverse mechanical properties, prolonging tool life and obvious spheroidizing effect.

Active Publication Date: 2021-11-02
DAYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide sulfur-containing ferritic stainless steel and its manufacturing method to solve the problem of poor transverse mechanical properties of free-cutting ferritic stainless steel in my country, improve the pressure-bearing range of free-cutting ferritic stainless steel, and expand the free-cutting ferritic stainless steel. Application fields of body stainless steel

Method used

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  • Sulfur-containing ferritic stainless steel and manufacturing method thereof
  • Sulfur-containing ferritic stainless steel and manufacturing method thereof
  • Sulfur-containing ferritic stainless steel and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0099] The present embodiment provides a manufacturing method of sulfur-containing ferritic stainless steel: the manufacturing method includes the following steps:

[0100] (1) Electric furnace primary smelting process: heating and melting raw materials to obtain primary molten steel.

[0101] (2) LF refining process: adding a slag-forming material and a deoxidizer to the primary molten steel to obtain a refined molten steel. According to the mass percentage, the refined molten steel includes the following chemical components: C: 0.15, Si: 0.30, Mn: 1.25, P: 0.025, S: 0.20%, Cr: 16.5, Ni: 0.40; Mo: 0.40; V: 0.10.

[0102] (3) VD degassing process: First, the refined molten steel is hoisted to the VD station, evacuated to 0.2 Torr, the temperature is controlled at 1650°C, the vacuum degree requirement: 67Pa, the vacuum holding time is 15min, and the total vacuum time is 25min.

[0103] Then, break the vacuum, feed the tellurium alloy cored wire into the wire feeding machine a...

Embodiment 2

[0127] This embodiment provides a method for manufacturing sulfur-containing ferritic stainless steel. The process of the manufacturing method is the same as that of Embodiment 1, and the difference is only in raw material components and quenching and tempering process parameters. According to the mass percentage, the billet in this implementation contains the following chemical composition: C: 0.16%; Si: 0.42%; Mn: 1.25%; P: 0.017%; S: 0.21%; Cr: 16.4%; Ni: 0.45%; Mo: 0.44%; V: 0.11%; Te: 0.025%; Ca: 0.025%. The diameter of the billet is 135×145.

[0128] In this example, by changing the process parameters of the quenching and tempering process, the properties of the sulfur-containing ferritic stainless steel samples prepared under different quenching and tempering process parameters were tested, as shown in Table 2. In the quenching process, the specific changes are the heating temperature and holding time of the fifth stage. In the tempering process, the specific changes a...

Embodiment 3

[0134] This embodiment provides a method for manufacturing sulfur-containing ferritic stainless steel. The process of the manufacturing method is the same as that in Embodiment 1, and the difference is only in the composition of the raw materials.

[0135] In this example, experimental design schemes with different formulations were adopted to test the properties of sulfur-containing ferritic stainless steel samples prepared under different experimental formulations, as shown in Table 3 and Table 4.

[0136] The mass percent of each chemical element in the steel of table 3 embodiment 3.1-3.9

[0137] Numbering C Si mn P S Cr Ni Mo V Ca Te Example 3.1 0.12 0.30 1.25 0.025 0.16 16.5 0.40 0.40 0.10 0.04 0.01 Example 3.2 0.12 0.30 1.25 0.025 0.20 16.5 0.40 0.40 0.10 0.04 0.03 Example 3.3 0.12 0.30 1.25 0.025 0.26 16.5 0.40 0.40 0.10 0.04 0.05 Example 3.4 0.17 0.30 1.25 0.025 0.20 16.5 0.40 0.40 ...

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Abstract

The invention belongs to the field of stainless steel smelting and hot working, and particularly relates to sulfur-containing ferritic stainless steel and a manufacturing method thereof. The manufacturing method comprises the following working procedures of electric furnace primary smelting, LF refining, VD degassing, die casting, forging cogging, forging forming, quenching and tempering, straightening and destressing, wherein in the VD degassing process, tellurium alloy core-spun yarns are added into molten steel in a VD furnace, and the adding amount of tellurium in the tellurium alloy core-spun yarns is 0.009%-0.045% of the mass of the molten steel. By means of the manufacturing method, the transverse mechanical property of the sulfur-containing ferritic stainless steel can be greatly improved, the transverse elongation is increased to 14% from 3%, and the transverse area reduction rate is increased to 17% from 2%. The prepared sulfur-containing ferritic stainless steel can be applied to high-pressure and high-humidity coal seam electro-hydraulic controllers in China, and the maximum use pressure can reach 41.5 MPa. Localization of coal mechanical bottleneck key materials is achieved, and import replacement is achieved.

Description

technical field [0001] The invention belongs to the field of stainless steel smelting and thermal processing, and in particular relates to a sulfur-containing ferritic stainless steel and a manufacturing method thereof. Background technique [0002] Free-cutting stainless steel is widely used in household appliances, mechanical equipment, auto parts, instruments and meters, electronic communication equipment and other industries, but the mature grades in my country that are included in the national standard are very limited, only 6 kinds, mature application of free-cutting ferrite There is only one kind of stainless steel, the grade is Y10Cr17 (S11717), which is a sulfur-containing ferritic stainless steel with good cutting performance. It mainly improves the cutting performance of ferritic stainless steel on automatic machine tools by adding sulfur wire. [0003] However, there are two main problems in this sulfur-containing ferritic stainless steel: first, the MnS inclusion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/44C22C38/46C22C38/02C22C38/04C21C7/10C21C7/00C21D1/25C21D1/30C21D8/00C22C33/06
Inventor 雷应华刘尚潭张军郭畅郑文超
Owner DAYE SPECIAL STEEL CO LTD
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