Free-cutting ferritic stainless steel

A ferrite and stainless steel technology, applied in the field of stainless steel manufacturing, can solve problems such as air leakage, scrap loss of solenoid valve parts, production of solenoid valve parts, inconvenience in production organization, etc., and achieve good weldability

Inactive Publication Date: 2008-04-02
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, 0Cr18Mo2Ca and 00Cr17MoTi materials may leak after welding
[0010] Third, the first type of stainless steel material for making the core iron and the second type of stainless steel material for making the iron stopper are two different stainless steel types, which brings inconvenience to the production and production organization of solenoid valve parts. Once the materials are mixed, it will cause scrap loss of solenoid valve parts and components
[0011] To sum up, none of the first-class or second-class stainless steel materials currently produced can satisfy the high performance of the material at the same time (while satisfying the corrosion resistance, machinability, weldability, coercive force, Magnetic induction intensity, salt spray corrosion and other conditions) requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] The production process flow that free-cutting ferritic stainless steel of the present invention adopts is as follows:

[0031] Process 1:

[0032] 1 t Vacuum induction furnace smelting→casting 360kg round ingot→forging billet (90×100mm)→hot-rolled bar→inspection→packing→storage.

[0033] Process 2:

[0034] 20 t EA F +18tAOD→Initial rolling (160×160×8000~10000mm)→Long profile hot-rolled wire rod→(annealing)→(pickling)→inspection→packaging→warehousing.

[0035] Process 3:

[0036] 60 t EA F +60tAOD+LF→continuous casting (160×160×8000~10000mm)→long profile hot-rolled wire rod→(annealing)→(pickling)→inspection→packaging→warehousing.

[0037] Note: The process in brackets depends on the needs of users.

[0038] Implement the present invention, through test (1 t The vacuum induction furnace has been trial-produced. After the cast steel ingot is forged and opened, the hot-rolled bar is handed over to the user for inspection and testing of relevant indicators), and t...

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PUM

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Abstract

The invention discloses an easy-cutting ferritic stainless steel relating to the easy-cutting ferritic stainless steel material used for making electromagnetic valve, etc., wherein, the chemical composition weight percent of the steel is as follows: less than or equal to 0.03 percent of C, 1.0 percent to 1.5 percent of Si, 0.6 percent to 1.0 percent of Mn, 0.15 percent to 0.30 percent of S, less than or equal to 0.04 percent of P, 16.5 percent to 18.0 percent of Cr, 0.75 percent to 1.25 percent of Mo, 0.20 percent to 0.50 percent of Ti and the rest, Fe and other inevitable impurities. Through reasonable improvement in composition proportion, the invention ensures that the ferritic stainless steel has excellent machinability, ferromagnetism and weldability and can meet the requirements of performances such as corrosion resistance, coercive force, magnetic induction and salt spray corrosion, thereby according with the requirements of electromagnetic valve manufacturers.

Description

technical field [0001] The invention relates to stainless steel manufacturing technology, in particular to free-cutting ferritic stainless steel materials such as solenoid valves. Background technique [0002] Stainless steel is a common alloy steel, which has become a metal material widely used in economy and life; from the perspective of steel structure, stainless steel can be divided into martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, duplex stainless steel, Precipitation hardening stainless steel and other five major steels. The stainless steel used to make solenoid valve materials must have good magnetic properties, and ferritic stainless steel is generally used. [0003] Ferritic stainless steel is made of Cr as the main alloying element. The content of Cr is generally in the range of 10.5-30%. In addition to the stainless steel and general corrosion resistance of ferritic stainless steel, its excellent local corrosion resistance s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28
Inventor 徐惠松
Owner BAOSHAN IRON & STEEL CO LTD
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