Abstract: Accordingly to an exemplary embodiment of the present invention, a high tensile strength, refractory steel can be provided which comprises, in mass %, approximately C: 0.04 to 0.14%, Si: 0.50% or less, Mn: 0.50 to 2.00%, P: 0.020% or less, S: 0.010% or less, Nb: 0.01 to 0.05%, Mo: 0.30% or more and less than 0.70%, Al: 0.060% or less, N: 0.0010 to 0.0060%, and the balance consisting of iron and unavoidable impurities. For example, a weld crack sensitive composition PCM can be defined by the following equation may be about 0.25% or less: PCM=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B. An area fraction of polygonal ferrite or pseudo polygonal ferrite in a ¼ thick position in the plate thickness direction of the steel plate of the final rolling product is about 10% or less.

Abstract: An air conditioning system for construction and agricultural vehicles is disclosed. A case includes an air-mix chamber into which blown air flows after passing through a cooling heat exchanger. The blown air that has flowed into the air-mix chamber flows out through a front face opening and a rear face opening. The front face opening and the rear face opening are arranged in such a manner that a first angle between the inflow direction in which the blown air flows into the air-mix chamber and a first outflow direction in which the blown air flows out from the front face opening is not smaller than a second angle between the inflow direction and a second outflow direction in which the blown air flows out from the rear face opening.

Abstract: An air conditioning system for construction and agricultural machines is disclosed. A third duct portion (37c) for leading the air-conditioning air from an air-conditioning unit (10) is arranged on a rail (9) for fixing an upper windshield (4a) and a lower windshield (4b), and at least a foot air outlet (40) for blowing out the air-conditioning air toward the knees of the occupant is arranged on the third duct portion (37c). Further, the air-conditioning air (warm air) is blown out of the foot air outlet (40) during the heating operation whereby the occupant can feel warmth in the neighborhood of the knees and the thighs. The occupant of the construction and agricultural machines can thus acquire a warm feeling in the neighborhood of the knees and the thighs during a heating operation of the air conditioning.

Abstract: An object of the present invention is to provide an air conditioner and a controlling method thereof capable of effectively conditioning air in an operator cab of a vehicle even if a windshield or door of the operator cab is opened. An air conditioner for conditioning air in an operator cab of a vehicle comprises: a first blowout port for blowing out the conditioned air to a front of the operator; a second blowout port for blowing out the conditioned air; an open/close sensor for detecting whether the operator cab is opened or closed; and an air volume ratio adjustment unit for setting a ratio of the volume of the conditioned air, which is blown out from the first blowout port when the open/close sensor detects that the operator cab is opened to be higher than the ratio when the operator cab is closed.

Abstract: A vehicle air conditioner is disclosed. Internal air paths and external air paths are arranged in parallel to each other, and the internal air and the external air are blown by a blower to the internal and external air paths. Heat exchangers are arranged in at least the internal air paths, and the internal air after passing through the heat exchangers are blown toward the passenger in the cabin from a face air outlet and a foot air outlet on the one hand and toward the wind shield in the cabin from a wind shield defroster air outlet. Also, the external air passed through the external air paths is blown toward the door window glass in the cabin from door defroster air outlets.