Arcelormittal

Arcelormittal Investigacion Y Desarrollo, S.l.

Frederick B Fletcher

Bruce L Bramfitt

John S Nelson

Jason T McCullough

Michael A Muscarella

George Jay Fraley

A cryogenic pressure vessel of formed of an ASTM A553 Type 1 cryogenic steel alloy including in wt. %: C: 0.01-0.04; Mn: up to 2.0; P: up to 0.02; S: up to 0.15; Si: up to 1.0; Ni: 7-11; Cr: up to 1.0; Mo: up to 0.75; V: up to 0.2; Nb: up to 0.1; Al: up to 0.1; and N: up to 0.01. The steel alloy may have an ultimate tensile strength of at least 900 MPa, a total elongation of at least 20%; a microstructure including between 5 and 20 area % reverted austenite and the remainder tempered martensite; a transverse Charpy impact energy of at least 27 J at −196° C.; and a lateral expansion of at least 0.381 mm at −196° C.

Cryogenic pressure vessels formed from low-carbon, high-strength 9% nickel steels

A method of making a high strength head-hardened crane rail and the crane rail produced by the method. The method comprises the steps of providing a steel rail having a composition comprising, in weight percent: C 0.79-1.00%; Mn 0.40-1.00; Si 0.30-1.00; Cr 0.20-1.00; V 0.05-0.35; Ti 0.01-0.035; N 0.002 to 0.0150; and the remainder being predominantly iron. The steel rail is cooled from a temperature between about 700 and 800&#xb0; C. at a cooling rate having an upper cooling rate boundary plot defined by an upper line connecting xy-coordinates (0 s, 800&#xb0; C.), (40 s, 700&#xb0; C.), and (140 s, 600&#xb0; C.) and a lower cooling rate boundary plot defined by a lower line connecting xy-coordinates (0 s, 700&#xb0; C.), (40 s, 600&#xb0; C.), and (140 s, 500&#xb0; C.).

Method of making high strength steel crane rail

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Wayne, PA, United States of America

Frederick B Fletcher