7results about How to "Reduce manganese content" patented technology

The invention relates to the technical field of metal powder, and provides low-manganese iron powder and a production method and application thereof.The production method of the low-manganese iron powder comprises the following steps that S1, smelting is conducted, specifically, scrap steel is smelted, a slag former and a first demanganizing agent are added, tapping is conducted, and smelted molten iron is obtained; s2, refining: refining the smelted molten iron, adding a second demanganizing agent, and carrying out soft argon blowing treatment to obtain refined molten iron; s3, water atomization treatment: after the refined molten iron is subjected to water atomization treatment, drying is performed, and crude powder is obtained; s4, screening: carrying out magnetic separation screening on the crude powder to obtain low-manganese iron powder; the first demanganizing agent comprises the following components in parts by weight: 60-80 parts of oxidized scale, 20-40 parts of potassium feldspar and 10-20 parts of dolomite; and the second demanganizing agent comprises the following components in parts by weight: 60-80 parts of potassium feldspar, 20-40 parts of oxidized scale and 10-20 parts of dolomite. By means of the technical scheme, the problem that the manganese content of iron powder is high in the prior art is solved.

The invention belongs to the technical field of manganese slag treatment, and provides a method for preparing heavy manganese carbonate from manganese slag washing water based on a microreactor. The method comprises the following steps: mixing manganese slag washing water and an additive, and carrying out solid-liquid separation to obtain filter residues and filtrate; and mixing the filtrate and the alkali liquor to obtain a manganese ion solution, and respectively introducing the manganese ion solution and carbon dioxide mixed gas into the microreactor for reaction to obtain the heavy manganese carbonate. The manganese slag washing water and the carbon dioxide react in the microreactor, and the pH value of the manganese ion solution, the flow of the manganese ion solution and the carbon dioxide, the reaction temperature, the reaction pressure and the reaction time are controlled, so that the yield of manganese in the obtained heavy manganese carbonate is high, the purity is high, and the manganese content in the effluent filtrate is low; the obtained heavy manganese carbonate can be directly used as a raw material for electrolytic manganese metal, and the purposes of effective treatment of manganese residue washing water and comprehensive recycling of resources under mild conditions are achieved.

This invention discloses a low-manganese stainless steel material and its preparation method, belonging to the field of stainless steel materials. The method includes melting raw materials in a melting furnace to obtain stainless steel liquid and maintaining the temperature; sampling and analyzing the existing manganese content of the stainless steel liquid; calculating the required manganese-reducing agent content and adding it to the stainless steel liquid; thoroughly stirring to ensure the manganese-reducing agent is uniformly dispersed in the stainless steel liquid and fully reacts with the manganese in the stainless steel liquid to generate manganese-containing inclusions; repeatedly removing manganese-containing inclusions from the stainless steel liquid to pre-purify it; and then temperature-controlled cooling and casting the pre-purified stainless steel liquid to obtain the low-manganese stainless steel material. This invention can achieve efficient and controllable reduction of manganese content during the preparation of stainless steel materials, and has advantages such as simple process, short flow, low cost, and high efficiency. The prepared low-manganese stainless steel material has high quality and excellent comprehensive performance. It is particularly suitable for preparing low-manganese stainless steel materials from high-manganese stainless steel scrap.

The invention relates to the technical field of welding materials, and proposes a high-toughness gas-shielded solid welding wire, which is composed of the following components in weight percentage: C 0.06%-0.12%, Mn 0.4%-0.7%, Si 0.2%-0.5%, Ni 0.1%-0.4%, Cr 0.1%-0.4%, Mo 0.1%-0.4%, Ta 0.1%-0.9%, Cu 0.15%-0.35%, S≤0.005%, P≤0.005%, O≤50ppm, N≤50ppm, and the rest is Fe and inevitable impurities. Through the above technical scheme, the problems of poor toughness of deposited metal after gas-shielded solid welding wire welding and high manganese content in gas-shielded solid welding wire in the related art are solved.

The invention discloses a boron microalloyed high-strength plastic cold-rolled medium manganese steel and a preparation method thereof. The chemical composition mass percentage is C: 0.15-0.25%, Mn: 4.5-6%, Al: 1.0-1.5%, Si: 0.3-0.4%, P: <0.005%, S: <0.005%, N: <0.004%, B: 0.001-0.005%, and the balance is Fe and inevitable impurities. The medium manganese steel is prepared by smelting, forging, hot rolling, softening annealing, pickling, cold rolling, and two-phase critical annealing. By utilizing the competitive segregation relationship between boron and manganese elements at austenite grain boundaries, the grain boundary brittleness of the steel is improved, and the medium manganese steel with a tensile strength of 954-1166MPa, an elongation after fracture of 31.4-49.4%, and a strength-plasticity product of 36.6-47.1GPa·% is obtained, which meets the performance indicators of the third generation of automotive high-strength steel.

The invention discloses a low-manganese stainless steel material and a preparation method thereof, and belongs to the field of stainless steel materials. Comprising the following steps: melting raw materials in a melting furnace to obtain stainless steel liquid and preserving heat; sampling the stainless steel liquid and analyzing the existing manganese content in the stainless steel liquid; calculating the content of a required manganese reducing agent and adding the manganese reducing agent into the stainless steel liquid; fully stirring to uniformly disperse the manganese reducing agent in the stainless steel liquid and fully react with manganese in the stainless steel liquid to generate manganese-containing inclusions; manganese-containing inclusions in the stainless steel liquid are repeatedly removed, and the stainless steel liquid is subjected to pre-purification treatment; and the stainless steel liquid subjected to pre-purification treatment is subjected to temperature control cooling casting forming, and the low-manganese stainless steel material is obtained. The manganese content in the stainless steel material preparation process can be efficiently and controllably reduced, the method has the advantages of being simple in process, short in flow, low in cost, high in efficiency and the like, and the prepared low-manganese stainless steel material is high in quality and excellent in comprehensive performance. The method is particularly suitable for preparing the low-manganese-content stainless steel material from the high-manganese-content stainless steel waste.

The invention provides a circuit board and a method for manufacturing the same, the circuit board is provided with a through hole with a small diameter according to a design value, and the circuit board is excellent in adhesiveness with a copper plating layer even without wet desmear. This circuit board is provided with an insulating layer in which a through hole is formed, and is characterized in that the insulating layer is composed of a cured product of a thermosetting resin composition, the thermosetting resin composition contains a thermosetting resin and an inorganic filler, the opening diameter of the top of the through hole is 30 [mu] m or less, and the manganese content of the insulating layer is less than 50 ppm.