37results about How to "Excellent heat crack resistance" patented technology

Disclosed is a welding material for austenitic heat-resistant steel, which has a chemical composition that contains more than 0.05% but 0.18% or less of C, 0.5% or less of Si, 1.5% or less of Mn, 40-50% of Ni, 20-25% of Cr, more than 8.0% but 13.0% or less of W, 0.01-0.2% of Ti, more than 0.03% but 0.20% or less of N and 0.01% or less of Al, and additionally if necessary, less than 0.60% of Nb, with the balance made up of Fe and impurities, while controlling O, P and S contained as impurities to 0.02% or less, 0.008% or less, and 0.005% or less, respectively. The welding material for austenitic heat-resistant steel exhibits excellent high-temperature cracking resistance during the welding. A welded metal that has high-temperature cracking resistance during the welding, stress relaxation cracking resistance when in use for a long period of time at high temperatures, and good creep strength can be provided using the above-described welding material. In addition, a welded joint can be provided, using the above-described welding material, from a base that has excellent creep strength at high temperatures and a welded metal that has high-temperature cracking resistance during the welding, stress relaxation cracking resistance when in use for a long period of time at high temperatures, and good creep strength.

THe invention provides a stainless steel flux cored wire, which is excellent in extension strength, low-temperature flexibility, anti-defection property and anti-hot-cracking property. The stainless steel flux cored wire inlcudes, by mass, lower than 0.04% of carbon, lower than 0.8% of silicon, 0.5-5.0% of manganese, lower than 3.0% of copper, 13-33% of nickel, 15-29% of chromium, 2.0-6.0% of molybdenum, lower than 1.0% of niobium, and 0.08-0.25% of nitrogen. In addition, the flux includes, by mass, 4.0-12.0% of TiO2, 0.05-3.0% of SiO2, 0.5-5.0% of ZrO2, lower than 2.0% of Al2O3, a bismuth compound with Bi equivalent value being lower than 0.01%, an alkali metal compound with alkali metal equivalent value being 0.1-2.0% and fluorides with fluorine equivalent value being 0.1-1.0%.

The invention discloses a vehicle part shell body die-casting mold material and a machining method thereof. A mold is prepared by a magnesium-aluminum alloy; and the magnesium-aluminum alloy comprises the following components in percentage by mass: 1.5-3.5% of iron, 8.1-10.5% of magnesium, 0.25-0.85% of silver, 0.06-0.18% of tungsten, 0.08-0.18% of chromium, 0.07-0.56% of tin, 1.2-3.8% of zinc, 0.08-1.76% of silicon carbide, 0.05-0.15% of graphite, and the balance of aluminum. The material is excellent in strength, toughness and high-temperature thermal fatigue resistance, can bear the temperature fusion, is suitable for long-time work at high temperature, is high in hardenability, high in size stability, excellent in machinability and high in thermal cracking resistance, and is suitable for large high-performance die-casting molds and extrusion molds with the requirements of complex structure, precision and long life.

A wire containing flux for gas shield arc welding in which a steel casing is filled with flux, wherein: the wire contains BaF2, C, Si, Mn, Al, Mg, Ni, Zr, Fe, and Li in prescribed amounts per total mass of wire; and the value expressed by BaF2 content / (Al content+Zr content) is 2.1-20.0.