摘要:
To provide a form-rolling device for various size tubes to create a groove in a position defined relative to the tube end. The device 1 provides a shaft portion 13 rotating about an axis C1, a convex-cross-sectional-shaped convex roller 14 projects outward from the circumference of the portion 13, a concave cross-sectional-shaped concave roller 15 rotating about a second axis parallel to C1 is disposed corresponding to the roller 14 along C1, and moving in approaching-separating direction from the roller 14, a tube-end positioning member 30 attached to the circumference of the portion 13 closer to a base end than the roller 14, and a distance along C1 between the member 30 and the roller 14, is varied, and a supporting member 57 supporting a ring member 51 fitted to the circumference of a tube 2 such that the member 51 is rotating about an axis C3 of the tube.
摘要:
A ferritic stainless steel suited for use as a member for heat exchangers to be brazed with Ni-based filler metal or Cu-based filler metal, comprising, on the basis of mass percent, C: 0.03% or less, Si: 3% or less, Mn: 2% or less, P: 0.05% or less, S: 0.03% or less, Cr: from 11 to 30%, Nb: from 0.15 to 0.8%, and N: 0.03% or less, wherein the balance is composed of Fe and incidental impurities, and wherein a value A determined by the following equation is 0.10 or greater: A = Nb - (C×92.9/12 + N×92.9/14).
摘要:
Disclosed is a ferritic stainless steel for hot-water tanks with welded structure, comprising, in terms of % by mass, at most 0.02 % of C, from 0.01 to 0.30 % of Si, at most 1 % of Mn, at most 0.04 % of P, at most 0.03 % of S, from more than 21 to 26 % of Cr, at most 2 % of Mo, from 0.05 to 0.6 % of Nb, from 0.05 to 0.4 % of Ti, at most 0.025 % of N, and from 0.02 to 0.3 % of Al, and optionally containing at least one of at most 2 %, preferably from 0.1 to 2 % of Ni and at most 1 %, preferably from 0.1 to 1 % of Cu, with a balance of Fe and inevitable impurities.
摘要:
To provide a form-rolling device for various size tubes to create a groove in a position defined relative to the tube end. The device 1 provides a shaft portion 13 rotating about an axis C1, a convex-cross-sectional-shaped convex roller 14 projects outward from the circumference of the portion 13, a concave cross-sectional-shaped concave roller 15 rotating about a second axis parallel to C1 is disposed corresponding to the roller 14 along C1, and moving in approaching-separating direction from the roller 14, a tube-end positioning member 30 attached to the circumference of the portion 13 closer to a base end than the roller 14, and a distance along C1 between the member 30 and the roller 14, is varied, and a supporting member 57 supporting a ring member 51 fitted to the circumference of a tube 2 such that the member 51 is rotating about an axis C3 of the tube.
摘要:
Provided is a method of forming a locking ridge for a case of forming the locking ridge on an outer peripheral surface of a joint portion by form rolling, the method realizing a joint portion structure which is superior in pipe detachment prevention performance when pipes with locking ridges are connected by fixing pipe ends with a housing. Using a convex roller arranged inside the workpiece pipe body and a forming circular groove arranged outside the pipe body, the locking ridge is form-rolled such that an upright wall portion thereof is raised at an angle of at least 65° and no greater than 90° with respect to the outer peripheral surface in the pipe axis direction, and that a height of the locking ridge from the outer peripheral surface to the apex of the tip portion is at least a total of curvature radii of faces of the processing means in contact with the pipe body.
摘要:
A ferritic stainless steel suited for use as a member for heat exchangers to be brazed with Ni-based filler metal or Cu-based filler metal, comprising, on the basis of mass percent, C: 0.03% or less, Si: 3% or less, Mn: 2% or less, P: 0.05% or less, S: 0.03% or less, Cr: from 11 to 30%, Nb: from 0.15 to 0.8%, and N: 0.03% or less, wherein the balance is composed of Fe and incidental impurities, and wherein a value A determined by the following equation is 0.10 or greater: A = Nb - (C×92.9/12 + N×92.9/14).
摘要:
A hot water tank having, on the inner surface thereof, a back bead formed by TIG-welding with no back gas sealing of steel members to each other having a composition comprising, % by mass, C: at most 0.025 %, Si: at most 1 %, Mn: at most 1 %, P: at most 0.045 %, S: at most 0.01 %, Ni: from 0.1 to 1 %, Cr: from more than 21 to 25 %, Mo: from 0.1 to 2 %, Al: from 0.02 to 0.3 %, N: at most 0.025 %, and Cu: from 0 to 1 %, and containing at least one of Ti: from 0.05 to 0.4 % and Nb: from 0. 05 to 0. 5 %, with the balance of Fe and inevitable impurities, wherein the Cr concentration in the steel basis material in the area having oxide scale soluble in an aqueous chloride solution, as formed therein in the heat-affected zone on the welded back side thereof, is at least 16 % by mass in the depth region of at least 10 nm from the steel basis material/oxide scale interface.
摘要:
Disclosed is a ferritic stainless steel for hot-water tanks with welded structure, comprising, in terms of % by mass, at most 0.02 % of C, from 0.01 to 0.30 % of Si, at most 1 % of Mn, at most 0.04 % of P, at most 0.03 % of S, from more than 21 to 26 % of Cr, at most 2 % of Mo, from 0.05 to 0.6 % of Nb, from 0.05 to 0.4 % of Ti, at most 0.025 % of N, and from 0.02 to 0.3 % of Al, and optionally containing at least one of at most 2 %, preferably from 0.1 to 2 % of Ni and at most 1 %, preferably from 0.1 to 1 % of Cu, with a balance of Fe and inevitable impurities.
摘要:
Provided is a tubular structure that, even when clearance between a housing and the tubular structure is large, can prevent tube removal and that is capable of absorbing a certain amount of vibration in a lengthwise direction and a manufacturing method therefor. The present invention is a tubular structure 100 comprising a tube member 1 provided with annular protrusions 12, 22 on a side of an insertion opening 11 that is a tube end part or a receiving opening 21 and, on the outer circumference of the ring member 1, ring members 13A, 13B arranged on an opposite side of the tube end part with respect to the annular protrusions 12, 22 having two side surfaces that are vertical with respect to an axis A of the tube member 1.
摘要:
Provided is a clad steel plate with excellent thermal conductivity that can be used suitably in cookware and the like. The present invention is a three-layer clad steel plate having a carbon steel base material and stainless steel mating material disposed respectively on both surface sides of the base material, wherein a plate thickness ratio L given by Equation (1) is 1.0 - 5.0 and at least one surface of the clad steel plate has a plurality of protrusions and recesses. Plate thickness ratio L = the plate thickness of the base material / the total thickness of the mating material ... Equation (1) Here, the base material thickness and the mating material thickness are the thicknesses at the protrusions.