A surface-treated component manufacturing method and apparatus capable of detecting an end of a steel bar. Quenching (surface treatment) is locally applied to a plurality of steel bars aligned end-to-end in an axial direction while moving the steel bars in the axial direction. Quenched portions are locally formed on each of the steel bars through a moving step, a detecting step, and a quenching step. In the detecting step, an end portion of one steel bar is displaced relative to an end portion of another steel bar with a pressure roller device, and passage of the end of the one or another steel bar is detected with a detection sensor. In the quenching step, the quenched portions are locally formed on each of the steel bars with a quenching device at a quenching timing determined on the basis of the result of detection by the detection sensor.

In some embodiments, a coating applied to steel reinforcement bar (e.g., steel rebar) that could considerably extend the lifetime of concrete structures by reducing steel rebar corrosion is disclosed. The coating includes a thin, passivating steel (e.g., stainless steel) layer that is applied to the outside of conventional steel rebar. The coating can be applied in-line through metal cold spray manufacturing, which is a high throughput coating technique that can be integrated into existing steel manufacturing plants. Furthermore, a novel, high performance ferritic steel with tailored resistance to corrosion from chlorides is described. The new ferritic steel is distinct from other commercial and experimental steels, and is better suited for coating low-cost steel structures like rebar. Multiple alloying elements including Cr, Al, and Si will each form protective oxides independently, increasing the total amount of protection and extending it over much wider ranges of pH and electrical potential.

The present invention relates to a ferritic free-cutting stainless steel consisting of: C0.02 mass %, Si0.50 mass %, 0.20Mn1.00 mass %, P0.05 mass %, 0.20S0.70 mass %, Cu1.5 mass %, Ni1.5 mass %, 10.0Cr20.0 mass %, Mo2.0 mass %, 0.30Al1.00 mass % O0.010 mass %, N0.030 mass %, and optionally at least one selected from the group consisting of: B0.0100 mass %, Mg0.0100 mass %, and Ca0.0100 mass %, with a balance being Fe and unavoidable impurities, in which the following three expressions are satisfied: ([Cr]+[Mo]+1.5[Si]+4[Al])/([Ni]+0.5[Mn]+30[C]+30[N])7, 900([C]+[N])+170[Si]+450[P]+12[Cr]+30[Mo]+10[Al]300, and 0.285[Mn]/[S]1.5, where [X] represents a content (mass %) of an element X.

Disclosed is a method of fabricating terminal plate materials according to an exemplary embodiment of the present invention. The method of fabricating terminal plate materials includes: a first drawing process of making a metal wire pass through a first die having a circular hole with a smaller diameter than the metal wire to generate a first metal drawing material having a cross-sectional shape, which corresponds to the circular hole; a rolling process of making the first metal drawing material generated by the first process pass between at least two rollers that rotate to generate a metal rolling material; and a second drawing process of making the metal rolling material pass through a second die having a predetermined cross-section to generate a second metal drawing material having a cross-sectional shape, which corresponds to the predetermined cross-section.

A processing line material clear out devices and methods are disclosed. The device is particularly useful for clearing metal billets from induction heating units, but may be used for many other processes having sequentially ordered materials traveling down a conveyor or other processing line. In one example of the invention, a reciprocating push rod rack is used to sequentially deposit and remove at least two push rods used to abut and clear the downstream billets. A push rod advance device is used to interlink independent, sequential push rods positioned on the billet track. On clearing of the billets, the push rods are retracted, removed from the billet track and stored on the push rod rack for ready use.

A heat treatment method of manufacturing high carbon bearing steel having excellent abrasion resistance and fatigue resistance, a steel wire rod for high carbon bearing steel subjected to the heat treatment, a manufacturing method of the steel wire rod, high carbon bearing steel manufactured by the heat treatment and a soaking method of a steel bloom used for manufacturing the steel wire rod. The heat treatment method of bearings includes the steps of: quenching a bearing-shaped steel part containing, by weight, 0.5% to 1.20% carbon and 1.0% to 2.0% silicon; and partitioning the quenched steel part at a temperature ranging from M.sub.s100 C. to M.sub.s for at least 10 minutes, where M.sub.s represents a temperature at which formation of martensite will start.

Embodiments of an ultra-fine-grained, medium carbon steel are disclosed herein. In some embodiments, the ultra-fine grained steel can have high corrosion fatigue resistance, as well as high toughness and yield strength. The ultra-fine grained steels can be advantageous for use as sucker rods in oil wells having corrosive environments.

A rolled steel bar has a composition consisting, by mass percent, of C: 0.27 to 0.37%, Si: 0.30 to 0.75%, Mn: 1.00 to 1.45%, S: 0.008% or more and less than 0.030%, Cr: 0.05 to 0.30%, Al: 0.005 to 0.050%, V: 0.200 to 0.320%, and N: 0.0080 to 0.0200%, the balance being Fe and impurities. The contents of P, Ti and O in the impurities are, by mass percent, P: 0.030% or less, Ti: 0.0040% or less, and O: 0.0020% or less. Y1 expressed by the formula <1> is 1.05 to 1.18.
Y1=C+(1/10)Si+(1/5)Mn+(5/22)Cr+1.65V(5/7)S<1>. C, Si, Mn, Cr, V, and S in the formula represent mass percent of the elements. A hot-forged part having a tensile strength of 900 MPa or higher and a transverse endurance ratio of 0.47 can be obtained by the rolled steel bar.

A steel comprises, by mass percent, C: 0.10 to 0.15%, Si: not less than 0.02% and less than 0.10%, Mn: more than 0.90% and not more than 2.50%, P0.030%, S0.050%, Cr: 0.80 to 2.0%, V: 0.05 to 0.50%, Al: 0.01 to 0.07%, N0.0080%, O0.0030%, and one or more selected from Mo, Cu, Ni, Ti, Nb, Zr, Pb, Ca, Bi, Te, Se and Sb, the balance being Fe and impurities. The composition satisfies [35Mn/S200], [20(669.3log.sub.e C1959.6log.sub.e N6983.3)(0.067Mo+0.147V)80], [140Cr+125Al+235V160] and [150511C+33Mn+56Cu+15Ni+36Cr+5Mo+134V200].

A steel, having a high corrosion resistance and low-temperature toughness, for a vehicle suspension spring part, the steel includes 0.21 to 0.35% by mass of C, more than 0.6% by mass but 1.5% by mass or less of Si, 1 to 3% by mass of Mn, 0.3 to 0.8% by mass of Cr, 0.005 to 0.080% by mass of sol. Al, 0.005 to 0.060% by mass of Ti, 0.005 to 0.060% by mass of Nb, not more than 150 ppm of N, not more than 0.035% by mass of P, not more than 0.035% by mass of S, 0.01 to 1.00% by mass of Cu, and 0.01 to 1.00% by mass of Ni, the balance being Fe and unavoidable impurities, with Ti+Nb0.07% by mass, wherein crystal grains of the steel after hardening have a prior austenite grain size number of 7.5 to 10.5, and the steel having a tensile strength of not less than 1,300 MPa.