Carpenter Technology Corporation

Gunvant N Maniar

Thoni V Philip

Joseph B Koch

Royal D Thomas, Jr

This invention provides a non-magnetic, austenitic, corrosion resistant stainless steel alloy having improved machinability, a consistently reproduceable coefficient of thermal expansion, and an essentially ferrite-free structure. The alloy contains about 0.04-0.10 w/o C, 0.03-0.07 w/o N, 2.00 w/o max. Mn, 1.00 w/o max, Si, 0.045 w/o max. P, 0.015-0.10 S, 19.00-24.00 Cr, 0.75 w/o max. Mo, 12.00-18.00 w/o Ni, and the balance iron. The alloy is balanced so that no more than about 2 v/o ferrite as determined by the DeLong diagram is present and so that the coefficient of thermal expansion is about 14.5.times.10.sup.-6 to 16.5.times.10.sup.-6 per C..degree. within the temperature range of about -51 to 121 C. This invention further provides articles, including a non-magnetic tube in a magnetically biased accelerometer having good corrosion resistance, a coefficient of thermal expansion of about 14.5.times.10.sup.-6 to 16.5.times.10.sup.-6 per C..degree. within the temperature range of about -51 to 121 C., and containing no more than about 2 v/o ferrite as determined by the DeLong diagram and therefore, being non-magnetic.

Free machining, mon-magnetic, stainless steel alloy

This invention provides a non-magnetic, austenitic, corrosion resistant stainless steel alloy having improved machinability, a consistently reproduceable coefficient of thermal expansion, and an essentially ferrite-free structure. The alloy contains about 0.04-0.10 w/o C, 0.03-0.07 w/o N, 2.00 w/o max. Mn, 1.00 w/o max. Si, 0.045 w/o max. P, 0.015-0.10 S, 19.00-24.00 Cr, 0.75 w/o max. Mo, 12.00-18.00 w/o Ni, and the balance iron. The alloy is balanced so that no more than about 2 v/o ferrite as determined by the DeLong diagram is present and so that the coefficient of thermal expansion is about 14.5.times.10.sup.-6 to 16.5.times.10.sup.-6 per C..degree. within the temperature range of about -51 to 121C. This invention further provides articles, including a non-magnetic tube in a magnetically biased accelerometer having good corrosion resistance, a coefficient of thermal expansion of about 14.5.times.10.sup.-6 to 16.5.times.10.sup.-6 per C..degree. within the temperature range of about -51 to 121C, and containing no more than about 2 v/o ferrite as determined by the DeLong diagram and therefore, being non-magnetic.

Magnetically biased device incorporating a free machining, non-magnetic,

A ferritic stainless steel weld wire for forming a ferritic weld deposit free of martensite under a gas blanket containing a reactive component. The weld wire contains in weight percent about

Ferritic stainless steel weld wire suitable for GMA welding

An alloy steel is provided containing, by weight percent, carbon 0.5-1.1, manganese 0.10-&lt;0.50, silicon 0.10-&lt;0.80, chromium 3.5-5.0, molybdenum 2.5-5.0, vanadium 0.5-2.0, cobalt 0.5-4.0, columbium 0.15-0.50, up to 0.10 aluminum and the balance iron except for incidental impurities. The alloy can be balanced to provide a minimum room temperature hardness of R.sub.c 60 with outstanding toughness and ductility or to provide a minimum room temperature hardness of R.sub.c 63 with good wear resistance and toughness.

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Bern Township, Berks County, PA, United States of America

Gunvant N Maniar