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Corrosion-Resistant, Free-Machining, Magnetic Stainless Steel

a technology of magnetic stainless steel and free-machining, which is applied in the field of stainless steel, can solve the problems of adversely affecting the magnetic properties of magnetic stainless steel, lowering the magnetic saturation induction, and increasing the coercivity

Inactive Publication Date: 2009-10-22
KOSA THEODORE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is an alloy that meets the needs of a certain process. The alloy has specific ranges for its weight percentages. This alloy is useful for a certain process.

Problems solved by technology

However, chromium, the element most used to improve corrosion resistance in steel alloys, adversely affects the magnetic properties of magnetic stainless steel.
More specifically, increasing the amount of chromium in magnetic stainless steel typically results in lower magnetic saturation induction and higher coercivity.

Method used

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Examples

Experimental program
Comparison scheme
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working examples

[0020]In order to demonstrate the novel combination of properties provided by the alloy according to the present invention, examples of the alloy and several comparative alloys were prepared and tested. The weight percent compositions of the various heats are set forth in Table 1 below.

TABLE 1Ht. No.CMnSiPSCrNiMoCuVN874.006.291.48.014.2313.05.201.00.04.97.011907.014.281.47.015.2213.09.191.00.04.98.011908.010.261.48.014.2213.06.19.50.03.98.011909.011.271.49.014.2113.06.181.00.03.49.011910.010.271.49.015.2213.05.19.50.03.49.011868.007.941.50.014.2013.08.20.30.03.05.011869.007.301.50.015.2213.04.20.30.04.05.011870.006.291.49.014.2313.06.191.00.04.05.011871.007.301.50.014.2313.05.191.49.03.05.011872.005.301.50.015.2313.041.001.00.03.05.011873.006.301.51.014.2213.04.201.00.99.05.010906.010.951.47.014.2213.11.19.30.03.05.011867.010.381.29.016.2617.42.19.30.03.05.026914.014.371.17.015.2717.49.20.30.03.05.027

[0021]The balance of each composition is iron and usual impurities. Heats 874, 907,...

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PUM

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Abstract

A corrosion-resistant, free-machining, magnetic stainless steel alloy is described. The alloy has the following weight percent composition: 0.025 max. C, 0.60 max. Mn, 1.0-2.0 Si, 0.035 max. P, 0.15-0.40 S, 12.0-14.0 Cr, 0.5 max. Ni, 0.5-1.3 Mo, 0.5-1.3 V, 0.5 max. Cu, 0.020 max. Al, 0.025 max. N, and the balance is iron and usual impurities.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a continuation of U.S. application Ser. No. 11 / 306,989, filed Jan. 18, 2006, the entirety of which is incorporated herein by reference.FIELD OF THE INVENTION[0002]This invention relates generally to stainless steels, and in particular, to a magnetic stainless steel that provides good corrosion-resistance and machinability.BACKGROUND OF THE INVENTION[0003]There are many known magnetic stainless steels that provide good machinability. Such steels are often described or identified as being “free-machining”. It is desirable for free-machining magnetic stainless steels to be able to resist corrosion when used in aggressively corrosive environments. However, chromium, the element most used to improve corrosion resistance in steel alloys, adversely affects the magnetic properties of magnetic stainless steel. More specifically, increasing the amount of chromium in magnetic stainless steel typically results in lower magnetic sat...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C38/60C22C38/18
CPCC22C38/001C22C38/02C22C38/04C22C38/22C22C38/60C22C38/42C22C38/44C22C38/46C22C38/24
Inventor KOSA, THEODORE
Owner KOSA THEODORE