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

The present invention relates to a coated cemented carbide milling insert for either wet or dry machining of cast iron such as nodular cast iron (NCI), grey cast iron (GCI), austempered ductile iron (ADI) and compacted graphite iron (CGI) where a high wear resistance and an excellent resistance against thermo cracks are required comprising:a substrate comprising from about 5 to about 7 wt-% Co, from about 140 to about 250 ppm Ti+Ta and balance WC with a weight ratio Ti / Ta of from about 0.8 to about 1.3 anda PVD-layer consisting of AlxTi1−xN, with x=from about 0.50 to about 0.70 and with a thickness of from about 1 to about 10 μm. The invention also relates to a method for making cutting tool inserts and their use.

A ferrous seal sliding part excellent in heat crack resistance, seizing resistance and abrasion resistance is provided. The ferrous seal sliding part having a seal sliding surface, wherein the seal sliding surface has a martensite parent phase which forms a solid solution with carbon of 0.15 to 0.6 wt % and contains a first dispersion material of at least either cementite of 5 to 70% by volume or MC-type carbide of 0.1 to 10% by volume and a second dispersion material of at least either graphite of 1 to 15% by volume or Cu alloy phase of 1 to 20% by volume dispersed therein, with a total content of the first dispersion material and the second dispersion material being 5 to 70% by volume.

The invention relates to a nickel-based welding electrode which comprises the following component by weight percent (wt%): 50.0-68.0% of Ni, 18.0-23.0% of Cr, 6.0-11.0% of Mo, 3.0-6.0% of Nb, 2.50-9.00% of Fe, 0.01-0.1% of C, 0.10-1.00% of Mn, 0.010-0.10% of Si, 0.015% of S or less, 0.015% of P or less, 0.01-0.10% of Cu, 0.003-0.010% of Co and the balance of impurities. The coat of the nickel-based welding electrode comprises the following components by weight percent of the welding core: 12-18% of marble, 10-15% of fluorite, 12-18% of barium carbonate, 5.0-6.4% of rutile, 3.5-5.0% of ferroniobium, 3.3-4.5 of chromium metal powder, 0.45-0.65% of sodium carbonate, 0.45-0.65% of electrolytic manganese and 1.3-1.8% of zircon sand, and the adhesion agent is 10-20% of the total weight of the power. The nickel-based welding electrode is prepared by mixing, wrapping mixture on the welding core and baking at low and high temperature. The nickel-based welding electrode disclosed by the invention is used for nickel-chromium-molybdenum alloy steel welding, ensures that the excellent mechanical properties, the excellent corrosion resistance, the excellent thermal crack resistance and the hightensile strength of the welding seam match with those of the base material, has good welding process performance, guarantees attractive molding and can be used for the welding of the steel (with 9% of Ni) working at low temperature.

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.

Disclosed is a welding material for an Ni-based heat-resistant alloy, which has a chemical composition that contains 0.06-0.18% of C, 0.5% or less of Si, 1.5% or less of Mn, 46-56% of Ni, 10-15% of Co, 20-25% of Cr, more than 10.0% but 14.0% or less of Mo, 0.01-0.5% of Ti, 0.1-1.0% of Al and 0.006% or less of N, and additionally if necessary, 0.1% or less of Nd 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 an Ni-based heat-resistant alloy 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, said welded joint being composed of a base of an Ni-based heat-resistant alloy that has excellent high-temperature strength 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.

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.

The invention provides a high-nitrogen, low-nickel, high-temperature flux-cored welding wire and a preparation process. The high-nitrogen, low-nickel, high-temperature flux-cored welding wire is composed of the following elements by mass percentage: C: below 0.04wt%, Si: below 0.8wt%, Mn: 0.5~5.0wt%, Cu: 1.0wt% or less, Ni: 25~33wt%, Cr: 17~26wt%, Mo: 3.0~6.0wt%, Nb: 3.0~5.0wt%, N: 0.1~0.4 wt%, Ti: 0.4~1.1wt%, Al: 0.1~0.5wt%, Ti / Al: 1.8~2.3 and Ti+Al: 0.5~1.5wt%, (Ti+Al) / N: 1.5~4.0, V : 0.04 to 0.12 wt%, Fe: the remainder. The invention adopts low-cost N to replace part of Ni elements, and prepares a new type of welding material used for welding 316L and part of nickel-based superalloys and whose high-temperature performance is not lower than that of nickel-based flux-cored welding wires, and simultaneously solves the problem of high price and scarcity of Ni. question. The high-nitrogen, low-nickel, and high-temperature flux-cored welding wire prepared by the invention can be used under high temperature (600-700° C.) conditions, and has excellent high-temperature mechanical properties, thermal crack resistance and high-temperature corrosion resistance.