The present disclosure provides for thick fins on the surface of coils or tubes in a steam cracking furnace. The fins have a thickness at their base from ¼ to ¾ of the radius of the furnace tube. The fins have grooves or protuberances on not less than about 10% of a major surface. The fins help increase the radiant heat taken up by the tube from the walls and combustion gases in the furnace.

A metal gasket bellows seal includes a first ply comprised of a first material having a first yield strength. The metal gasket bellows seal also includes a second ply positioned adjacent to the first ply and comprised of a second material having a second yield strength that is less than the first yield strength.

The present invention provides a Ni-based alloy having a high strength and excellent hot workability. The present invention relates to a high strength Ni-based superalloy having a composition including, in terms of % by mass: C: 0.005 to 0.05%; Fe: 0.1 to 2.0%; Cr: 10 to 20%; Co: 10 to 20%; Mo: 1.0 to 8.0%; W: 1.0 to 8.0%; Ti: 0.1 to 2.0%; Al: 2.0 to 4.5%; and Nb: 0.1 to 2.0%, with the balance being Ni and unavoidable impurities.

In a Ni-base alloy, an area-equivalent diameter D is calculated. D is defined by D=A.sup.1/2 from an area A of a largest nitride in a field of view when an observation area S.sub.0 is observed. This process is repeated in n fields of view for measurement, where n is the number of the fields of view for measurement, so as to acquire n pieces of data on D, and the pieces are arranged in ascending order D.sub.1, D.sub.2, . . . , D.sub.n to obtain a reduced variate y.sub.j. The obtained values are plotted on X-Y axis coordinates, where an X axis corresponds to D and a Y axis corresponds to y.sub.j. In a regression line y.sub.j=a×D+b, y.sub.j is obtained when a target cross-sectional area S is set to 100 mm.sup.2. When the obtained y.sub.j is substituted into the regression line, the estimated nitride maximum size is ≦25 μm in diameter.

Nickel-base composite niobium bearing alloys including delta and/or eta strengthening phases in addition to gamma prime precipitates in a gamma matrix.

The present invention provides methods and systems for applying a coating to a non-ferrous or ferrous material that includes providing a material, a heat source, an immersion tank, and a drying environment. The material is placed within the heat source and heated to a temperature between the range of between about 204.44° C. to about 537.78° C. (400° F. to about 1000° F.). The material is immersed within an immersion containing a ratio of molybdenum disulfide solution to water of between about 2:1 to about 4:1 at a temperature between about 26.67° C. to about 48.89° C. (about 80° F. to 120° F.), and the material is dried at a temperature between about 51.67° C. to about 98.89° C. (125° F. and 210° F.).

The invention relates to a nickel-based superalloy comprising, in percentages by mass, 4.0 to 5.5% rhenium, 1.0 to 3.0 ruthenium, 2.0 to 14.0% cobalt, 0.3 to 1.0% molybdenum, 3.0 to 5.0% chromium, 2.5 to 4.0% tungsten, 4.5 to 6.5% aluminum, 0.50 to 1.50% titanium, 8.0 to 9.0% tantalum, 0.15 to 0.30% hafnium, 0.05 to 0.15% silicon, the balance being nickel and unavoidable impurities.

The invention also relates to a single-crystal blade (20A, 20B) comprising such an alloy and a turbomachine (10) comprising such a blade (20A, 20B).

The cylinder rod of a hydraulic cylinder includes a body portion having a bar shape, and a head portion arranged at a longitudinal end of the body portion. The body portion has a coating formed on its outer peripheral surface. The coating includes, in terms of area ratio in cross section, not less than 56.1% and not more than 84.4% of a chromium carbide phase, with the remainder consisting of a nickel-based alloy phase and an oxide phase. The area ratio of the chromium carbide phase may be 61.7% or more.

Provided is a metal gasket including, expressed in mass%, C: 0.10% or less, Si: 1.0% or less, Mn: 2.0% or less, P: 0.04% or less (including 0%), S: 0.01% or less (including 0%), Ni: 25.0-60.0%, Cr: 10.0-20.0%, either Mo or W alone, or both Mo + W/2: 0.05-5.0%, Al: more than 0.8% to 3.0% or less, Ti: 1.5-4.0%, Nb: 0.05-2.5%, V: 1.0% or less (including 0%), B: 0.001-0.015%, Mg: 0.0005-0.01%, S/Mg: 1.0 or less, N: 0.01% or less (including 0%), and O: 0.005% or less (including 0%), with the remainder being Fe and unavoidable impurities. The metal gasket has a metal structure in which a precipitate γ′ phase having an average equivalent circle diameter of 25 nm or larger is not present within the austenite base.

A material and method are disclosed such that the material can be used to form functional metal pieces by producing an easily sintered layered body of dried metal paste. On a microstructural level, when dried, the metal paste creates a matrix of porous metal scaffold particles with infiltrant metal particles, which are positioned interstitially in the porous scaffold's interstitial voids. For this material to realize mechanical and processing benefits, the infiltrant particles are chosen such that they pack in the porous scaffold piece in a manner which does not significantly degrade the packing of the scaffold particles and so that they can also infiltrate the porous scaffold on heating. The method of using this paste provides a technique deposition/removal process.