30results about How to "Low diffusible hydrogen" patented technology

The invention relates to a welding method of high-strength steel for a pressure steel pipe of a 610MPa hydropower station, belonging to the technical field of steel pipe welding. In the method, a constant-strength low-hydrogen electric welding rod is used for priming, and a constant-strength matched welding rod is adopted to continuously weld and fill a weld pass by adopting a submerged-arc welding method, wherein the welding line energy is strictly controlled to be about 30-40kJ/cm, and the interpass temperature is controlled to be 100-150 DEG C; and after welding, an aluminum silicate plate is used for covering a welding joint for slow cooling so as to realize the welding of a steel plate for a steel pipe for a 610MPa hydropower station without preheating before welding and heat treatment after welding. The method solves the problems that the traditional steel for the pressure steel pipes of the 610MPa hydropower station needs to be preheated before welding and subjected to stress relief heat treatment after welding, and the welding efficiency is low.

A highly basic particle flux for submerged arc welding that produces less than 7 ml/100 gr of diffusible hydrogen in the weld metal, which flux comprises a carbon dioxide containing compound with an effective amount of heat releasable carbon dioxide in the range of 0.5-3.5% by weight of the flux over 10% by weight of a low melting point compound and a binder.

Disclosed is an ultra-low hydrogen high-tenacity seamless flux-cored wire for 550 MPa high-strength steel. The flux-cored wire is composed of flux core powder and low-carbon steel band wrapping the flux core powder. The flux core powder is composed of rutile powder, rare earth fluoride, atomized ferrosilicon powder, low-carbon ferromanganese powder, aluminum-magnesium alloy powder, metal titanium powder, metal nickel powder, metal chromium powder, metal molybdenum powder, alumina powder, quartz powder, and the balance iron powder and unavoidable impurities. Re in the rare earth fluoride and a trace of calcium in the atomized ferrosilicon powder of the flux core powder form a combined effect, the size of weld metal inclusion is reduced, the combined effect of Al-Mg-Ti enables the components of the inclusion to facilitate nucleation of acicular ferrite, the content of the acicular ferrite is increased, the structure is refined, and therefore good low-temperature impact toughness is achieved, and the -40 DEG C impact energy average value can reach 80 J or above.

The invention belongs to the technical field of welding materials, and particularly relates to a nickel base alloy submerged arc welding sintered flux and a preparation method and application thereof.According to the nickel base alloy submerged arc welding sintered flux, a main slag system is mainly composed of a CaF2-MgO-Al2O3-CaO-BaF2-SiO2 system, and specifically comprises the following components of, by mass, 18-35 parts of CaF2, 9-33 parts of MgO, 16-28 parts of Al2O3, 8-12 parts of CaO, 4-15 parts of SiO2, 2-12 parts of BaF2, 0.5-5 parts of TiO2, 0.5-2 parts of ZrO2, 0.5-5 parts of alloy and 15-20 parts of sodium silicate. The flux provided by the invention is good in performance and low in diffusible hydrogen, is matched with a solid welding wire ERNiCrMo-4, and is good in manufacturability, and the weld metal mechanical performance is good.

The invention provides an acidic high-strength and high-toughness flux-cored wire. The acidic high-strength and high-toughness flux-cored wire comprises a flux core and a sheath coating the outer sideof the flux core, wherein the flux core is prepared from the following components in parts by weight: 300-430 parts of rutile, 20-40 parts of feldspar, 13-25 parts of quartz, 8-20 parts of zircon sand, 4-14 parts of magnesia, 3-10 parts of sodium fluoride, 3-10 parts of sodium fluosilicate, 3-10 parts of lithium fluoride, 5-13 parts of ferrotitanium, 5-15 parts of magnesium powder, 2-9 parts of silicon-calcium alloy, 3-11 parts of aluminum-magnesium alloy, 22-40 parts of ferrosilicon, 14-25 parts of rare-earth ferrosilicon, 120-170 parts of metal manganese, 110-150 parts of nickel powder, 45-70 parts of ferromolybdenum, 3-12 parts of graphite and the balance of iron powder, wherein the sum of the parts by weight of the medicinal powder components is 1000 parts. The acidic flux-cored wireprovided by the invention still has relatively high low-temperature impact toughness and relatively good cold crack resistance at a relatively high strength.

The invention provides a flux-cored wire for repairing a hot forging die and a using method of the flux-cored wire. The flux-cored wire comprises an alloy steel strip outer skin and flux-cored powder; the alloy steel strip outer skin is prepared from the components including, by mass, 0.20%-0.29% of C, 0.60%-0.70% of Si, 0.5%-0.8% of Mn, less than or equal to 0.01% of S, less than or equal to 0.015% of P, 12%-13% of Cr, 2%-3% of Ni, 4.0%-4.9% of Mo, 0.3%-0.5% of V and the balance Fe; the flux core powder is prepared from the components including, by mass, 55%-60% of rutile, 3%-5% of sodium fluoride, 1%-2% of magnetite, 3%-5% of potassium cryolite, 5%-8% of zircon sand, 4%-7% of potassium titanate, 2%-3% of cerium oxide and the balance Fe. According to the flux-cored wire, main alloy elements are transited through the alloy steel strip outer skin, the transition rate of the alloy elements is increased, so that surfacing metal has good abrasion resistance and impact toughness, and the service life of the hot forging die is prolonged.