A kind of sulfur-containing ferritic stainless steel and its manufacturing method

A manufacturing method and stainless steel technology, which is applied in the fields of stainless steel smelting and thermal processing, can solve the problems of poor transverse mechanical properties of free-cutting ferritic stainless steel, achieve the effects of improving transverse mechanical properties, reducing aspect ratio, and improving transverse mechanical properties

Active Publication Date: 2022-03-18
DAYE SPECIAL STEEL CO LTD
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  • Abstract
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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

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  • A kind of sulfur-containing ferritic stainless steel and its manufacturing method
  • A kind of sulfur-containing ferritic stainless steel and its manufacturing method
  • A kind of sulfur-containing ferritic stainless steel and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0100] (1) Primary smelting process in electric furnace: heat and melt raw materials to obtain primary molten steel.

[0101] (2) LF refining process: adding slagging material and deoxidizer to the primary molten steel to obtain refined molten steel. According to 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, hoist the refined molten steel to the VD station, vacuumize to 0.2 Torr, control the temperature at 1650°C, vacuum degree requirement: 67Pa, vacuum holding time 15min, total vacuum time 25min.

[0103] Then, break the vacuum, feed the tellurium alloy cored wire into the wire feeding machine according to the test ratio, and study the influence of th...

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 thermal processing, and in particular relates to a sulfur-containing ferritic stainless steel and a manufacturing method thereof. The manufacturing method includes the following steps: electric furnace primary smelting, LF refining, VD degassing, die casting, forging billet opening, forging, quenching and tempering, straightening and stress relief; wherein, in the VD degassing process, the VD A tellurium alloy cored wire is added to the molten steel in the furnace, and the amount of tellurium element added to the tellurium alloy cored wire is 0.009-0.045% of the mass of the molten steel. The invention can greatly improve the transverse mechanical properties of the sulfur-containing ferritic stainless steel, increase the transverse elongation from 3% to 14%, and increase the transverse section shrinkage from 2% to 17%. The sulfur-containing ferritic stainless steel prepared by the invention can be applied to electro-hydraulic controllers of high-pressure and high-humidity coal seams in my country, and the maximum operating pressure can reach 41.5 MPa. The localization of key materials in coal machinery has been solved, and import substitution has been realized.

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 Patents(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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