摘要:
The present invention relates to a roof for a ladle furnace which can be compatible with a dust collection elbow or with a dust collection hood. The roof according to the present invention includes a side part (102) which has a vertical cylindrical shape, and a cover part (104) which covers an upper end of the side part. A first seating hole (110) is formed in a central portion of the cover part, and a second seating hole (112) is formed in the cover part at a position adjacent to the first seating hole. A small ceiling (160) or a dust collection hood (170) is selectively seated into the first seating hole. A dust collection elbow (180) or a water cooling panel (190) is selectively seated into the second seating hole.
摘要:
Disclosed herein is a roof for an electric furnace. The roof includes: a small-ceiling seating port (120) which has a small-ceiling seating surface (122) and a small-ceiling support surface (124) that extends from the small-ceiling seating surface inwards and downwards; and a large ceiling (130) which has an upper roof panel (132) that radially extends from the small-ceiling seating port at a downward inclination angle, a lower roof panel (134) disposed below the upper roof panel at a position spaced apart from the upper roof panel, and a side roof panel (136) connected to the upper roof panel and the lower roof panel. The upper roof panel is connected to the outer circumferential surface of the small-ceiling seating port, and the lower roof panel is connected to a lower end of the small-ceiling support surface so that the inclination angle of the lower roof panel can be increased.
摘要:
The present invention relates to a sintered bearing and a preparation method thereof, wherein the method comprises: a step for forming a mixed powder by mixing metal powder, kish graphite, and lubricant; forming a molded body by applying pressure to the mixed powder; forming a sintered body by sintering the molded body; and impregnating the sintered body in oil. The invention is prepared by adding 0.01-10 parts by weight of kish graphite to metal powder and thus provides excellent abrasion resistance, strength, and self lubricity.
摘要:
Disclosed are a steel plate for a line pipe having excellent hydrogen induced crack resistance with a tensile strength of 450 MPa or more, and a preparation method thereof. According to the present invention, the steel plate for a line pipe, having excellent hydrogen induced crack resistance comprises: 0.03∼0.05 wt% of carbon (C); 0.2-0.3 wt% of silicon (Si); 0.5-1.3 wt% of manganese (Mn); 0.010 wt% or less of phosphorus (P); 0.005 wt% or less of sulfur (S); 0.02-0.05 wt% of aluminum (Al); 0.2-0.5 wt% of nickel (Ni); 0.2-0.3 wt% of chromium (Cr); 0.03-0.05 wt% of niobium (Nb); 0.02-0.05 wt% of vanadium (V); 0.01-0.02 wt% of titanium (Ti); 0.001-0.004 wt% of calcium (Ca); and a balance of iron (Fe) and inevitable impurities, and has a tensile strength of 450 MPa or more.
摘要:
This invention relates to an ultra-high-strength steel bar and to a method of manufacturing the same., in which the steel bar includes C: 0.05 to 0.45 wt%, Si: 0.10 to 0.35 wt%, Mn: 0.1 to 0.85 wt%, Cr: 0.6 to 1.20 wt%, and Mo: 0.05 to 0.35 wt%, with the remainder being Fe, wherein a martensite structure is formed at a surface layer and a fine ferrite structure is formed at a center layer.
摘要:
The present invention relates to a die-casting apparatus which cools metals after hot pressing. More specifically, disclosed is a die-casting apparatus using immersion cooling, wherein a die is immersed into a cooling medium for improving the cooling speed of the die and securing uniform quality. The die-casting apparatus includes: an upper mold provided with a casting surface on the bottom aspect; a lower mold provided with a casting surface on the top aspect; a cooling water tub storing a cooling medium at a predetermined level; and a press means for lowering and compressing the upper mold against the lower mold, and subsequently, lowering the upper and lower molds in the compressed state, and lifting the molds in the reverse sequence.
摘要:
Provided is a high manganese nitrogen-containing steel sheet. The high manganese nitrogen-containing steel sheet according to the present invention comprises 0.5 to 1.0 wt % of carbon, 10 to 20 wt % of manganese, 0.02 to 0.3 wt % of nitrogen, with a remainder of Fe and unavoidable impurities. The high manganese nitrogen-containing steel sheet according to the present invention produces an austenite phase at room temperature, in which the stacking fault energy is effectively controlled by adding chrome and nitrogen. Accordingly, the high manganese nitrogen-containing steel sheet of the present invention produces a mechanical twin during the plastic deformation of the steel sheet, thereby increasing the work hardening rate, tensile strength, and workability.
摘要:
A method for manufacturing a metal separator for a vehicle fuel cell according to an aspect of the present disclosure comprises the steps of: preparing a base material; applying a platinum (Pt)-containing coating agent and an electrolyte to the base material to form a discontinuous coating film; and thermally treating the coating film-formed base material.
摘要:
Provided is a hot stamping component having a tensile strength of 1680 Mpa or greater including a microstructure comprising prior austenite grains (PAGs), and an average grain diameter of the PAGs is 25 µm or less.