A steel member, a hot-rolled steel sheet to be used as a material thereof, and production methods therefor are provided. A steel member contains 0.010% to 0.120% Ti, in which 0.005% or more of Ti is precipitated as a precipitate having a particle size of 20 nm or less in the microstructure. A hot-rolled steel sheet for the steel member contains 0.010% to 0.120% Ti, in which 0.005% or more of Ti is present as dissolved Ti in the microstructure. A method for producing the steel member includes subjecting a hot-rolled steel sheet to forming processing and then performing heat treatment including heating to a temperature of higher than 550° C. and 1,050° C. or lower and then cooling at an average cooling rate of 10° C./s or more in the temperature range of 550° C. to 400° C.

A limb for a breathing circuit manufactured from very thin walled polymer materials has an elongate axial reinforcing spine lying freely inside the conduit and fixed to each end connector. The spine is laterally compliant but axially stiff. The spine provides resistance to tensile and compressive loads on the conduit, including that induced by prevailing internal pressures.

A limb for a breathing circuit manufactured from very thin walled polymer materials has an elongate axial reinforcing spine lying freely inside the conduit and fixed to each end connector. The spine is laterally compliant but axially stiff. The spine provides resistance to tensile and compressive loads on the conduit, including that induced by prevailing internal pressures.

A paper hookah hose includes a bendable tube, a smoking mouth and a connecting tube. The bendable tube is a tubular member made of paper and having at least two layers and a spiral structure. The bendable tube has a section of bellows for bending. The bendable tube may be a full bellows or a combination of a bellows and a straight tube. The smoking mouth and the connecting tube are completely made of traditional pulp.

A paper hookah hose includes a bendable tube, a smoking mouth and a connecting tube. The bendable tube is a tubular member made of paper and having at least two layers and a spiral structure. The bendable tube has a section of bellows for bending. The bendable tube may be a full bellows or a combination of a bellows and a straight tube. The smoking mouth and the connecting tube are completely made of traditional pulp.

The invention relates to a method for producing a component from a medium-manganese flat steel product with 4 to 12 wt % Mn, preferably more than 5 to less than 10 wt % Mn, and with TRIP/TWIP effect. In order to improve the degrees of deformation of the shaped component while at the same time reducing the forming forces, the invention proposes shaping the flat steel product into a component in a first shaping step at a temperature of the flat steel product of 60° C. to below Ac3, preferably from 60° C. to 450° C. The invention also relates to a component produced according to said method and to a use for said components.

A process for winding a convolutely wound tubular structure having a machine direction, a cross-machine direction coplanar thereto, and a Z-direction orthogonal to both the machine- and cross-machine directions is disclosed.

A double-wall spiral welded pipe includes a first steel belt layer and a second steel belt layer which have equal widths, are arranged in parallel and align with each other; at least two supporting steel bars perpendicular to the first steel belt layer and the second steel belt layer are arranged between the first steel belt layer and the second steel belt layer; the supporting steel bars are arranged on end parts of two sides of the first steel belt layer and the second steel belt layer and extend together with the first steel belt layer and the second steel belt layer; and the first steel belt layer, the second steel belt layer and the supporting steel bars on the end parts of the two sides are mutually welded to form a double-layer composite steel belt with a rectangular section in an extending direction.

A double-wall spiral welded pipe includes a first steel belt layer and a second steel belt layer which have equal widths, are arranged in parallel and align with each other; at least two supporting steel bars perpendicular to the first steel belt layer and the second steel belt layer are arranged between the first steel belt layer and the second steel belt layer; the supporting steel bars are arranged on end parts of two sides of the first steel belt layer and the second steel belt layer and extend together with the first steel belt layer and the second steel belt layer; and the first steel belt layer, the second steel belt layer and the supporting steel bars on the end parts of the two sides are mutually welded to form a double-layer composite steel belt with a rectangular section in an extending direction.

The invention provides a tube for use as part of a structural support pole, and a method for manufacturing a tube, comprising a plurality of tube perimeter sections, wherein each tube perimeter section of the first plurality of tube perimeter sections is formed by pultrusion, each tube perimeter section of the first plurality of tube perimeter sections having the same pultrusion cross-sectional shape, and wherein each tube perimeter section comprises: an outer surface; an inner surface; a side surface; and a cavity between the inner surface and the outer surface, wherein the cavity extends through the tube perimeter section. The side surface is adapted to be fastened to an adjacent side surface of an adjacent tube perimeter section, thereby to form an annular arrangement of tube perimeter sections. The tube further comprises a first filament, wherein the first filament is wound about the outer surfaces of the first plurality of tube perimeter sections arranged in an annular arrangement.