摘要:
The present invention provides high temperature strength and fire-resistant steel superior in weld joint reheat embrittlement resistance and toughness which is produced using steel of a room temperature strength of the 400 to 600N/mm2 class containing as main ingredients C: 0.010% to less than 0.05%, Si: 0.01 to 0.50%, Mn: 0.80 to 2.00%, Cr: 0.50% to less than 2.00%, V: 0.03 to 0.30%, Nb: 0.01 to 0.10%, N: 0.001 to 0.010%, and Al: 0.005 to 0.10%, limiting the contents of Ni, Cu, Mo, and B, and satisfying the relationship of 4Cr[%]-5Mo[%]-10Ni[%]-2Cu[%]-Mn[%]>0.
摘要:
The present invention provides high temperature strength and fire-resistant steel superior in weld joint reheat embrittlement resistance and toughness which is produced using steel of a room temperature strength of the 400 to 600N/mm2 class containing as main ingredients C: 0.010% to less than 0.05%, Si: 0.01 to 0.50%, Mn: 0.80 to 2.00%, Cr: 0.50% to less than 2.00%, V: 0.03 to 0.30%, Nb: 0.01 to 0.10%, N: 0.001 to 0.010%, and Al: 0.005 to 0.10%, limiting the contents of Ni, Cu, Mo, and B, and satisfying the relationship of 4Cr[%]-5Mo[%]-10Ni[%]-2Cu[%]-Mn[%]>0.
摘要:
The present invention provides a fire-resistant steel material superior in weld heat affected zone reheat embrittlement resistance and low temperature toughness when welded by large heat input and exposed to fire and a method of production of the same, that is, a material containing C: 0.012 to 0.050%, Mn: 0.80 to 2.00%, Cr: 0.80 to 1.90%, and Nb: 0.01 to less than 0.05%, restricting Cu to 0.10% or less, containing suitable quantities of Si, N, Ti, and Al, restricting the contents of Mo, B, P, S, and O, and having a balance of Fe and unavoidable impurities, having contents of C, Mn, Cr, Nb, and Cu satisfying −1200C−20Mn+30Cr−330Nb−120Cu≧−80, having a steel structure as observed by an optical microscope of an area fraction of 80% or more of a ferrite phase, and having a balance of the steel structure of a bainite phase, martensite phase, and mixed martensite-austenite structure.
摘要:
The present invention provides a fire-resistant steel material superior in HAZ toughness of a welded joint which is high in high temperature yield strength at an envisioned fire temperature of 700 to 800° C. and is free of embrittlement of the welded joint even if exposed at this envisioned fire temperature and a method of production of the same, that is, a fire-resistant steel material of a composition containing, by mass %, C: 0.005% to less than 0.03%, Si: 0.01 to 0.50%, Mn: 0.05 to 0.40%, Cr: 1.50 to 5.00%, V: 0.05 to 0.50%, and N: 0.001 to 0.005% and restricted in contents of Ni, Cu, Mo, B, P, S, and O obtained by heating a steel slab to 1150 to 1300° C., then hot working or hot rolling the slab to an end temperature of 880 degrees or more, acceleratedly cooling the worked or rolled steel material under conditions of a cooling rate at a position of the slowest cooling rate of at least 2° C./sec or more, stopping this accelerated cooling at a temperature region where the surface temperature of the steel material becomes 350 to 600° C., and then allowing the material to cool.
摘要:
The present invention provides a fire resistant steel material excellent in high temperature strength, toughness, and reheating embrittlement resistance containing, by mass %, C: 0.001% to 0.030%, Si: 0.05% to 0.50%, Mn: 0.4% to 2.0%, Nb: 0.03% to 0.50%, Ti: 0.005% to less than 0.040%, N: 0.0001% to less than 0.0050%, and Al: 0.005% to 0.030%, limiting P: 0.03% or, less and S: 0.02% or less, satisfying C—Nb/7.74≦0.005 and 2≦Ti/N≦12, and having a balance of Fe and unavoidable impurities and, further, a process for production of a fire resistant material comprising heating a steel slab comprised of this chemical composition to 1100 to 1350° C. and hot rolling it by a cumulative reduction rate at 1000° C. or less of 30% or more.
摘要:
The present invention provides a common rail formed by bonding a common rail body and a common rail holder which has a pressing surface and a convex bonding surface, by means of a heat pressure bonding process and a liquid phase diffusion bonding process, wherein the height H of the convex bonding surface satisfies 1 μm≦H≦50 μm, and the common rail holder includes a deformation introducing portion in which an area of a cross-section parallel to the pressing surface is smaller than the area of the pressing surface.
摘要:
An automobile-use high pressure fuel injection accumulator-distributor comprised of a body of an automobile-use high pressure fuel injection accumulator-distributor to which pipe attachment holders for attaching fuel distribution pipes for distributing fuel to injection nozzles at an equal pressure are joined by liquid phase diffusion bonding etc., wherein each holder is comprised of a tube part at the pipe side and a partial cone-shaped skirt at the end of the rail body side, each holder skirt has a shape spreading in a partial cone shape toward the joint face end with an angle from the holder tube part side face of 10° or more in a range of a length of 2 mm or more in the holder axial direction at the outer circumference of the end of the holder at the joint face side, the rail body has holder joint position determining guide grooves at its holder joint positions, each guide groove is comprised of a groove inner circumferential wall of a size enabling engagement with a holder joint inner circumference, a groove bottom forming a joint face with the holder, and a groove outer circumferential wall of a partial cone shape bulging out to the inner side parallel to the holder skirt from the groove bottom toward the holder side at a depth of 2 mm or more, and a metal ring is plastically deformed and press-fit into a clearance of 0.5 mm or more between each holder skirt and the groove outer circumferential wall and parallel to the joint face.
摘要:
The present invention provides a fire-resistant steel material superior in HAZ toughness of a welded joint which is high in high temperature yield strength at an envisioned fire temperature of 700 to 800° C. and is free of embrittlement of the welded joint even if exposed at this envisioned fire temperature and a method of production of the same, that is, a fire-resistant steel material of a composition containing, by mass %, C: 0.005% to less than 0.03%, Si: 0.01 to 0.50%, Mn: 0.05 to 0.40%, Cr: 1.50 to 5.00%, V: 0.05 to 0.50%, and N: 0.001 to 0.005% and restricted in contents of Ni, Cu, Mo, B, P, S, and O obtained by heating a steel slab to 1150 to 1300° C., then hot working or hot rolling the slab to an end temperature of 880 degrees or more, acceleratedly cooling the worked or rolled steel material under conditions of a cooling rate at a position of the slowest cooling rate of at least 2° C./sec or more, stopping this accelerated cooling at a temperature region where the surface temperature of the steel material becomes 350 to 600° C., and then allowing the material to cool.
摘要:
A liquid phase diffusion bonding method for a metal machine part superior in the quality of the joint and the productivity enabling the bonding time to be shortened, achieving homogenization of the bonding structure and improving the tensile strength, fatigue strength, and joint quality and reliability. This liquid phase diffusion bonding method of a metal machine part is characterized interposing an amorphous alloy foil for liquid phase diffusion bonding at bevel faces of metal materials, performing primary bonding by melt bonding said amorphous alloy foil and said metal material by resistance welding to form a joint, then performing secondary bonding by liquid phase diffusion bonding by reheating said joint to at least the melting point of said amorphous alloy foil, then holding it there to complete the solidification process of said joint.
摘要:
A compressor for a turbo chiller that can stably and efficiently operate in various operating states is provided. An aerodynamic feature map showing a rotating stall line at which rotating stall occurs is provided on a map represented by a flow parameter reflecting the volume flow based on the output thermal capacity of the chiller and by a pressure parameter reflecting the head based on the evaporator pressure and the condenser pressure. A minimum rotation speed obtaining unit obtains a minimum rotation speed from the pressure parameter and the rotating stall line on the aerodynamic feature map in the current operating state, and a rotation speed greater than or equal to the minimum rotation speed thus obtained is designated to the inverter.