In an exhaust gas purification apparatus or other apparatuses that are supplied with ammonia generated from a urea aqueous solution and causes selective reduction and purification of nitride oxides, a shot peening treatment is applied to a welded portion of its exhaust pipe which is made of a ferritic stainless steel plate and through which exhaust gas containing ammonia and hydrogen passes. By shot peening the welded portion of the exhaust pipe, a tensile residual stress in the welded portion of the exhaust pipe can be replaced with a compressive residual stress, and further the diameter of metal crystal grains in the welded portion can be reduced. In this way, the durability of the exhaust pipe can be improved.

A collector for several manifold pipes of a motor vehicle carrying exhaust gas, including a first shell and a second shell, which can be connected to one another in a sealed manner by a shell connection that forms a connection plane (E), at least one outlet port for connecting to an exhaust pipe of an exhaust gas system, and several manifold pipe connection ports for connecting the manifold pipes, wherein the outlet port is designed as a rim hole within the respective shell and at least one first manifold pipe connection port is provided, which is designed as a rim hole within only one of the two shells.

A duct element for the exhaust system of a motor vehicle with an internal combustion engine, including at least one flexible duct part, preferably a bellows. The flexible duct part is embodied at least partially from a first type of steel with a Mo-content 4% or 6% and with a N-content from 0.3% to 0.6% or from 0.18% to 0.25%, preferably embodied from steel of the type 1.4565 or the type 1.4547. Furthermore a decoupling element is provided for motor vehicles with an internal combustion engine and a respective use of steel embodied with a Mo-content 4% or 6% and a N-content from 0.3% to 0.6% or from 0.18% to 0.25%, preferably steel of the type 1.4565 or 1.4547.

In an exhaust pipe spherical joint X, a spherical annular seal member 36 is fitted and fixed to a pipe end portion 42, the spherical annular seal member 36 is seated by abutting against a flange 43, a flared portion 47 formed of an FeCr base stainless steel and containing 17.00 to 19.00% by mass of Cr is secured to a downstream-side exhaust pipe 44, and an inner surface 48 of a concave spherical surface portion 45 is brought into slidable contact with a composite surface 40 in which a surface 38 constituted by a reinforcing member 5 and a surface 39 constituted by a solid lubricant are present in mixed form in an outer surface 37 of an outer layer 35 of the spherical annular seal member 36.

An assembly for coupling thermally a thermoelectric generator (TEG) to an exhaust manifold includes a first heat-exchanger, a first dielectric-layer, a TEG, and a direct-bond-copper-arrangement (DBC). The first dielectric-layer overlies a portion of the outer surface of the first heat-exchanger. The first dielectric-layer is formed by firing a thick-film dielectric material onto the stainless steel of the first heat-exchanger. The TEG defines a first contact suitable to be coupled thermally and electrically to the first conductor-layer. The DBC is interposed between the first dielectric-layer and the first contact of the TEG. The DBC is formed by an adhesion-layer formed of high-adhesion-copper-thick-film in contact with the first dielectric-layer, a bond-layer formed of copper-thick-film that overlies and is in contact with the adhesion-layer opposite the first-dielectric-layer, and a copper-foil-layer that overlies and is in contact with the bond-layer opposite the adhesion-layer.

An austenitic cast iron including basic elements of C, Si, Cr, Ni, Mn and Cu; and the balance including Fe, inevitable impurities and/or a trace-amount modifier element, which is effective in improving a characteristic of the cast iron, in a trace amount; and structured by a base comprising an Fe alloy in which an austenite phase makes a major phase in ordinary-temperature region; wherein the basic elements fall within compositional ranges that satisfy the following conditions when the entirety of the cast iron is taken as 100% by mass: C: from 2.0 to 3.0%; Si: from 4.0 to 5.4%; Cr: from 0.8 to 2.0%; Mn: from 3.9 to 5.6%; Ni: from 17 to 22%; and Cu: from 0.9 to 1.6%.

An exhaust silencer for a motor vehicle is provided. In one example, the silencer comprises a noise-reducing structure and a heat sink to transfer heat from exhaust gases to the exterior of the silencer, the heat sink comprising two regions of fins which define a plurality of flow channels through the heat sink, the flow channels directing the flow of exhaust through the silencer from an inlet passage to an outlet passage. In this way, a temperature of the exhaust is reduced, and the silencer and downstream components of an exhaust system may be constructed of materials of a lower thermal tolerance.

A novel sound absorbing sheet material with a unique combination of micro-louver slit parameters and patterns provides superior noise attenuation and a reduced perforation area (less than 3.5%) to better protect fiberglass insulation when used in a muffler assembly. A muffler assembly is disclosed incorporating the novel sound absorbing sheet as the inner exhaust conduit.

An ultra-pure ferritic stainless steel, a manufacturing method, and use thereof. The ultra-pure ferritic stainless steel comprises in percentage by weight, C0.025%, N0.025%, Si1.00%, Mn1.20%, Cr: 18.00%-24.00%, Nb: 0.40%-0.75%, Mo: 1.75%-2.50%, W: 0.80%-1.20%, Cu: 0.30%-0.60%, Al0.015%, Ti0.01%, P0.03%, S0.01%, and satisfies 3.4%2Nb+Mo+W5.2% and 32%Cr+4.7Mo+2.4W+11.5Cu45%, with the balance being Fe and inevitable impurities. With the composite strengthening of Nb, W and Mo, and the reasonable matching of Cu, Al and Ti, the obtained ultra-pure ferritic stainless steel can meet the requirements of working and serving at higher temperatures, has good high-temperature strength, high-temperature fatigue life and high-temperature oxidation resistance, has good cold working performance and good brazing performance.

A heat-resistant, austenitic cast steel comprising by mass 0.30 to 0.50% of C, 0.50 to 2.0% of Si, 0.50 to 2.0% of Mn, 0.10 to 0.40% of S, 16.0 to 21.0% of Cr, 6.0 to 12.0% of Ni, 0.5 to 2.0% of Nb, and 0.80% or less of Cu, the balance being Fe and inevitable impurities.