Work-hardenable austenitic manganese steel and method for the production thereof
First Claim
1. A work-hardenable austenitic manganese steel having an elongation at rupture of 10 percent to 80 percent, as measured according to L=5 d or L=10 d, and essentially consisting of, each in percent by weight:
- 0.7 to 1.7 C5.0 to 18.0 Mn0 to 3.0 Cr0 to 4.0 Ni0 to 2.5 Mo0.1 to 0.9 Siup to 0.1 Pwith the proviso that the carbon-to -manganese ratio is between 1;
4 and 1;
14, and containing an amount of micro-alloying elements in percent by weight;
0.0 to 0.2 Ti0.0 to 0.05 Zrwith the proviso that the sum Ti+Zr is in the range of 0.002 percent by weight to 0.25 percent by weight, the remainder iron and impurities arising during the melting process.
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Accused Products
Abstract
A work-hardenable austenitic manganese steel has a base composition (each in percent by weight) of 0.7 to 1.7 carbon, 5.0 to 18.0 manganese, 0 to 3.0 chromium, 0 to 4.0 nickel, 0 to 2.5 molybdenum, 0.1 to 0.9 silicon, up to 0.1 phosphorus and contains micro-alloying elements of 0.0 to 0.20 titanium, 0.0 to 0.05 zirconium and 0.0 to 0.05 vanadium; the remainder being iron and impurities arising from the melting process. The ratio of carbon to manganese is in the range of 1:4 to 1:14 and the total amount of micro-alloying elements is limited to a range of 0.002 to 0.25 percent by weight. The melt of the base composition is tapped at 1,450° C. to 1,600° C. into a casting ladle in which the micro-alloying elements are added. An ingot is cast, cooled, reheated to austenitization temperatures and quenched.
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Citations
21 Claims
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1. A work-hardenable austenitic manganese steel having an elongation at rupture of 10 percent to 80 percent, as measured according to L=5 d or L=10 d, and essentially consisting of, each in percent by weight:
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0.7 to 1.7 C 5.0 to 18.0 Mn 0 to 3.0 Cr 0 to 4.0 Ni 0 to 2.5 Mo 0.1 to 0.9 Si up to 0.1 P with the proviso that the carbon-to -manganese ratio is between 1;
4 and 1;
14, and containing an amount of micro-alloying elements in percent by weight;0.0 to 0.2 Ti 0.0 to 0.05 Zr with the proviso that the sum Ti+Zr is in the range of 0.002 percent by weight to 0.25 percent by weight, the remainder iron and impurities arising during the melting process. - View Dependent Claims (2, 3, 20)
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4. A method for producing a work-hardenable austenitic manganese steel casting or ingot, said method comprising the steps of:
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melting a charge in an electric furnace to form a melt; adding slag-forming additives to said melt; adjusting said melt for an analysis as given below in percent by weight; 0.7 to 1.7 carbon 5.0 to 18.0 manganese 0.0 to 3.0 chromium 0.0 to 4.0 nickel 0.0 to 2.5 molybdenum 0.1 to 0.9 silicon up to 0.1 phosphorus, the remainder being iron and impurities originating in the melting process and the ratio of carbon to manganese being in the range of 1;
4 to 1;
14;heating said melt to a tapping temperature in the range of 1450°
C. to 1600°
C.;deoxidizing said melt using an element having an affinity for oxygen; tapping said melt into a casting ladle; adding to said melt in said casting ladle micro-alloying elements in a amount as given below in percent by weight; - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21)
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5. 0 to 0.20 titanium
0.0 to 0.05 zirconium the sum of the contents of said micro-alloying elements being in the range of 0.002 to 0.25 percent by weight; -
casting said melt at a temperature in the range of 1420°
C. to 1490°
C. into a mold andcooling said melt in said mold to form said casting or ingot.
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Specification