A hot stamped article of high strength steel sheet excellent in bending deformability having a predetermined chemical composition, having an area rate of 90% or more of the microstructures of the steel sheet comprised of one or more of lower bainite, martensite, and tempered martensite, and having a ratio of the length of grain boundaries with a rotational angle about a rotational axis of the <011> direction of the crystal grains of the lower bainite, martensite, and tempered martensite of 15 or more with respect to the length of grain boundaries with a rotational angle of 5 to 75 of 80% or more.

A hot press processing device 1 includes steps of: a heating step of heating a workpiece W; a press step of press-molding the workpiece W heated in the heating step; a cooling step of cooling a part of the workpiece W press-molded in the press step and causing it to undergo martensite transformation to form a hard zone Zh in the workpiece W, and cooling another part of the workpiece W and causing it to undergo ferrite/bainite transformation to form a soft zone Zs in the workpiece W. In the cooling step, the hot press processing device 1 cools a predetermined portion Zb in the soft zone Zs after increasing rigidity and hardness of the predetermined portion Zb.

A hot press processing device 1 includes steps of: a heating step of heating a workpiece W; a press step of press-molding the workpiece W heated in the heating step; a cooling step of cooling a part of the workpiece W press-molded in the press step and causing it to undergo martensite transformation to form a hard zone Zh in the workpiece W, and cooling another part of the workpiece W and causing it to undergo ferrite/bainite transformation to form a soft zone Zs in the workpiece W. In the cooling step, the hot press processing device 1 cools a predetermined portion Zb in the soft zone Zs after increasing rigidity and hardness of the predetermined portion Zb.

A piercer plug having good base-material deformation resistance is provided. A method of manufacturing a piercer plug (10) includes the steps of; preparing a plug body (1) including a tip portion (11) and a cylindrical portion (12) having a hole (121) usable to attach a bar and located rearward of the tip portion (11); forming a build-up layer (2) on the surface of the tip portion (11); and heating the plug body (1) such that the temperature of the tip portion (11) with the build-up layer (2) formed thereon is not lower than the austenite transformation temperature and the temperature of the cylindrical portion (12) is lower than the austenite transformation temperature.

A device for aligning a metal blank for a temperature control system which has at least one temperature control unit for heating or cooling the metal blank includes at least two support rollers on which the metal blank can be placed and conveyed through the temperature control system by rotation of the support rollers in the throughput direction and within a conveying plane. The support rollers are arranged spaced apart in the throughput direction. The device further includes a first centering unit having at least one centering finger which is movably arranged within the conveying plane such that the centering finger is movable transversely to the throughput direction in order to align the metal blank in a predetermined orientation.

A controlled thermal coefficient product manufacturing system and method is disclosed. The disclosed product relates to the manufacture of metallic material product (MMP) having a thermal expansion coefficient (TEC) in a predetermined range. The disclosed system and method provides for a first material deformation (FMD) of the MMP that comprises at least some of a first material phase (FMP) wherein the FMP comprises martensite randomly oriented and a first thermal expansion coefficient (FTC). In response to the FMD at least some of the FMP is oriented in at least one predetermined orientation. Subsequent to deformation, the MMP comprises a second thermal expansion coefficient (STC) that is within a predetermined range and wherein the thermal expansion of the MMP is in at least one predetermined direction. The MMP may be comprised of a second material phase (SMP) that may or may not transform to the FMP in response to the FMD.

In a manufacturing method for a sliding member, a nitrogen diffusion layer, a nitrogen compound layer, and an oxidation layer are formed by executing a first step of cooling a workpiece formed of a steel material after heating the workpiece in an atmosphere containing ammonia at 570 to 660 C., a second step of performing, subsequently to the first step, tempering while pressurizing a front surface side of the workpiece, and a third step of performing, subsequently to the second step, steam treatment of heating the workpiece in a steam atmosphere.

A hot stamp cell has a source of blanks, an oven to elevate the temperature of the blank, and a press to form the blank to the required shape. The oven has a pair of access doors located on opposite sides. A first robot is provided to move a blank from the source to the oven through one of the doors and a further robot provided to remove the blank from the oven through the other door. Each of the robots has a material handling tool that includes a fork with tines to carry a blank and a gripping mechanism to secure the blank to the tines. The floor of the oven has a support surface to allow stable support of the blank during heating. The floor is provided with channels extending between the doors dimensioned to receive the tines. The channels permit placement of the blank on to the surface by lowering of the fork and subsequent removal of the fork from the oven.

A roller chain having at least one pair of offset links wherein the offset link plates are made with a steel having a high chromium content and are through-hardened using an austempering heat treatment (such as a salt bath quench). The resulting offset link plates may have a hardness in range of 44-50 HRC on the Rockwell hardness scale and a bainite metallurgical microstructure. The offset link plates may also have a greater fatigue strength than at least one of the inner link plates and the outer link plates. The inner and outer link plates may be formed out of a plain carbon steel which is heated, quenched and tempered to produce a martensite microstructure.

The invention discloses a continuous hot rolled coil for a high collapse-resistant SEW petroleum casing and a manufacturing method thereof, and belongs to the technical field of hot continuous rolling production. Provided is a continuous hot rolled coil for a high collapse-resistant SEW petroleum casing with low alloy element cost and excellent initial welding property, and a manufacturing method thereof. The production cost of the hot continuous rolled coil is lowered by reducing expensive alloy elements such as Mo and V therein, and strictly controlling the content components of chemical elements such as Cr, Mn and Ti. According to the manufacturing method, a continuous cast slab is used as an initial billet and subjected to rough rolling by refined grains for 5-7 passes under the temperature-controlled heating condition to form an intermediate billet, and then the intermediate billet is subjected to finish rolling for at least 4 passes, then finally cooled and coiled to complete the production and processing of the continuous hot rolled coils, and achieve the purpose of controlling the initial yield strength and the initial tensile strength.