摘要:
There is described a process for manufacturing an alloying-treated iron-zinc alloy dip-plated steel sheet excellent in press-formability, having, on the surface thereof, numerous fine concavities, by subjecting a cold-rolled steel sheet to a zinc dip-plating treatment in a zinc dip-plating bath having an aluminum content of from 0.05 to 0.30 wt.%, in which the temperature region causing an initial reaction for forming , an iron-aluminum layer is limited within a range of from 500 to 600 °C , an alloying treatment in which an alloying treatment temperature is limited within a range of from 480 to 600 °C , and a temper-rolling treatment.
摘要:
In order to realize the treatment for an organic material anaerobically, which contains a big amount of a solid matter, and in order to deal with the organic material at a high decomposition rate and at a lower cost, the method and apparatus provides: the steps of: solubilizing the solid organic material in the organic material by alkali treatment to obtain the soluble organic material; applying acid fermentation to the organic material containing the soluble organic material, obtained in the solubilization step, by anaerobic bacteria; separating the material obtained in the acid fermentation step into the solid component and into the liquid component; applying methane fermentation to the liquid component obtained in the separation step for obtaining the digestive gas; introducing the digestive gas to the acid fermentation step, introducing the generating ammonia in the acid fermentation step into the digestive gas; and taking out the ammonia, together with the digestive gas from the acid fermentation system, thus removing the ammonia; and recycling the solid component obtained in the separation step to the solubilization step.
摘要:
The present invention relates to a steel sheet that consists essentially of 0.10 to 0.37% C, 1% or less Si, 2.5% or less Mn, 0.1% or less P, 0.03% or less S, 0.01 to 0.1% sol.Al, 0.0005 to 0.0050% N, 0.0003 to 0.0050% B, by mass, and balance of Fe, [14B/(10.8N)] being 0.5 or more, average particle size of precipitate BN being 0.1 µm or more, and grain size of prior austenite after the hardening treatment being 2 to 25 µ m. The steel sheet according to the present invention allows an inexpensive hardening treatment method to be applied to improve the strength to a level required for the structural components and the functional components of automobiles, while providing excellent toughness after the hardening treatment.
摘要:
There is described a process for manufacturing an alloying-treated iron-zinc alloy dip-plated steel sheet excellent in press-formability, having, on the surface thereof, numerous fine concavities, by subjecting a cold-rolled steel sheet to a zinc dip-plating treatment in a zinc dip-plating bath having an aluminum content of from 0.05 to 0.30 wt.%, in which the temperature region causing an initial reaction for forming , an iron-aluminum layer is limited within a range of from 500 to 600 °C , an alloying treatment in which an alloying treatment temperature is limited within a range of from 480 to 600 °C , and a temper-rolling treatment.
摘要:
A refining agent contains Al, MgO, and CaO as main components, and uses dolomite as a MgO source and CaO source. When the refining agent is supplied into molten iron, it produces Mg vapor due to a reaction in the molten iron, and causes a refining reaction by the Mg vapor.
摘要:
The method for manufacturing galvanized steel sheet has a step of adjusting the surface texture thereof by blasting solid particles against the surface thereof. The surface texture is defined by at least one parameter selected from the group of parameters consisting of mean roughness Ra on the surface of steel sheet, peak count PPI on the surface of steel sheet, and filtered centerline waviness Wca on the surface of steel sheet. The galvanized steel sheet has a surface in dimple-pattern texture.