Free-cutting steel includes a specific composition, with an A value defined by a following formula (1) satisfying 4.0 or more and 20.0 or less, and remainder having Fe and an unavoidable impurity; and texture with 1000 or more sulfide particles with an equivalent circle diameter of less than 1 μm per mm.sup.2, 500 or more sulfide particles with an equivalent circle diameter of 1 μm or more and 5 μm or less per mm.sup.2, and 1000 or more Pb particles with an equivalent circle diameter of 1 μm or less per mm.sup.2, wherein

A value=(Mn+5Cr)/S   (1)

here, symbols of elements in the formula indicate contents (% by mass) of the elements.

A gas cutting method for cutting a steel material and a steel material producing method including arranging one steel material and another steel material in proximity, setting a preheating region on the one steel material in such a way that a preheating flame applied thereto does not reach the other steel material, preheating the one steel material by applying the preheating flame to the preheating region, and gas-cutting the one steel material by moving a cutting oxygen from the preheating region across a boundary between the one steel material and the other steel material until the cutting oxygen enters the other steel material. The preheating region may be set in such a way that an outer edge of the preheating flame is at least 2 mm away from the other steel material.

A gas cutting method for cutting a steel material and a steel material producing method including arranging one steel material and another steel material in proximity, setting a preheating region on the one steel material in such a way that a preheating flame applied thereto does not reach the other steel material, preheating the one steel material by applying the preheating flame to the preheating region, and gas-cutting the one steel material by moving a cutting oxygen from the preheating region across a boundary between the one steel material and the other steel material until the cutting oxygen enters the other steel material. The preheating region may be set in such a way that an outer edge of the preheating flame is at least 2 mm away from the other steel material.

A pinch roll delivers a respective rolled product. A control device opens the pinch roll at a respective trigger time and at a respective transport speed of the respective rolled product. The control device determines the respective trigger time and/or the respective transport speed using a model that depends on a coefficient of friction. After opening the pinch roll, a measuring device detects iteratively a position or a derivation in time of the position of the respective rolled product. The detected positions or the detected derivations in time of the position are provided to the control device. The control device in dependency on the positions or the derivations in time of the position updates the coefficient of friction and uses the updated coefficient of friction for determining the respective trigger time and/or the respective transport speed for the next rolled product delivered by the pinch roll.

The present invention provides a pillar member of a vehicle, which is characterized by comprising: a pillar main body portion; and a connecting and joining portion provided on both ends of the pillar main body portion and coupled to a vehicle body. The pillar main body portion and the connecting and joining portion are consecutively formed. The connecting and joining portion includes: a first connecting and joining portion provided on one side of the pillar main body portion; and a second connecting and joining portion provided on the other side of the pillar main body portion so as to face the first connecting and joining portion. The pillar main body portion is consecutively formed through a roll forming technique in a region between the first connecting and joining portion and the second connecting and joining portion, and has an odd number of closed cross section portions formed therein.

The present invention provides a pillar member of a vehicle, which is characterized by comprising: a pillar main body portion; and a connecting and joining portion provided on both ends of the pillar main body portion and coupled to a vehicle body. The pillar main body portion and the connecting and joining portion are consecutively formed. The connecting and joining portion includes: a first connecting and joining portion provided on one side of the pillar main body portion; and a second connecting and joining portion provided on the other side of the pillar main body portion so as to face the first connecting and joining portion. The pillar main body portion is consecutively formed through a roll forming technique in a region between the first connecting and joining portion and the second connecting and joining portion, and has an odd number of closed cross section portions formed therein.

A method of roll-forming with gap fillers for a solenoid used for a transmission includes the steps of providing a can of a solenoid, the can having a discontinuous surface with a gap, providing additional material in the gap, and roll-forming the additional material in the gap simultaneously with roll-forming the can to maintain a smooth path for rollers during roll-forming for the solenoid.

A method of roll-forming with gap fillers for a solenoid used for a transmission includes the steps of providing a can of a solenoid, the can having a discontinuous surface with a gap, providing additional material in the gap, and roll-forming the additional material in the gap simultaneously with roll-forming the can to maintain a smooth path for rollers during roll-forming for the solenoid.

A method for producing a metal sheet with raised lines uses a rolling mill including a roll stand and produces a metal sheet including, on each of an upper surface and a lower surface, a plurality of raised lines extending in a rolling direction. The method includes a preparing step, an incorporating step, and a forming step. In the preparing step, grooved rolls are prepared, each of the grooved rolls including a plurality of grooves in an outer peripheral surface. In the incorporating step, the grooved rolls are incorporated in the roll stand as an upper roll and a lower roll, respectively. In the forming step, a workpiece is rolled by the rolling mill and is formed into a metal sheet with raised lines formed corresponding to the respective grooves of the grooved rolls.

A method for producing a metal sheet with raised lines uses a rolling mill including a roll stand and produces a metal sheet including, on each of an upper surface and a lower surface, a plurality of raised lines extending in a rolling direction. The method includes a preparing step, an incorporating step, and a forming step. In the preparing step, grooved rolls are prepared, each of the grooved rolls including a plurality of grooves in an outer peripheral surface. In the incorporating step, the grooved rolls are incorporated in the roll stand as an upper roll and a lower roll, respectively. In the forming step, a workpiece is rolled by the rolling mill and is formed into a metal sheet with raised lines formed corresponding to the respective grooves of the grooved rolls.