36results 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 and

a PVD-layer consisting of Al_xTi_1-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.

The invention discloses novel special hot-stamping die steel HS7 and relates to the technical field of die steel component formulas and manufacturing. The chemical components of the special hot-stamping die steel include, by weight, 0.41-0.45% of C, 0.45-0.55% of Si, 0.35-0.45% of Mn, 6.4-6.80% of Cr, 1.20-1.40% of Mo, 0.75-0.85% of V, 015% or below of P, 0.003% or below of S and the balance Fe and inevitable impurities and residual trace elements. The die steel adopts unique optimized alloy element proportion, the organization level of and purity degree of materials are greatly improved through refined smelting and multidirectional forging and combination with high temperature homogenizing, ultrafine processing and other processes, the key indicators of the hot-stamping die steel are obviously improved, including abrasion resistance, high temperature abrasion resistance, thermal fatigue cracking resistance, resistance to plastic deformation and the like. Therefore, improve the qualityof hot stamping dies can be obviously improved, the service life of the dies can be prolonged, and better economic benefits can be obtained.

The invention discloses a common rail traffic bainite steel wheel used under the cold and rigor service environment and a manufacturing method of the common rail traffic bainite steel wheel. The common rail traffic bainite steel wheel comprises chemical components including 0.05%-0.30% of C, 0.50%-1.50% of Ni, 0.01%-1.20% of Cr, 0.70%-2.10% of Mn, 0.20%-1.00% of Si, 0.01%-1.00% of W, 0.05%-0.60% of Mo, 0.01%-0.80% of Cu, 0.01%-0.20% of V, 0.001%-0.20% of Nb, 0.0001%-0.0350% of B, 0.001%-0.040% of RE, not larger than 0.020% of P, not larger than 0.020% of S and the balance Fe and inevitable residual elements, wherein the sum of Mn and Cr is larger than or equal to 2.0% and smaller than or equal to 3.0%. By adopting a new alloy design system and alloying principle of C-Ni-Mn-Cr-Mo, after thewheel is molded, a rim obtained after advanced heat treatment obtains a carbide-free bainite organization structure, and the wheel has the excellent comprehensive mechanical property, decay resistance and service performance, in particular has the high low-temperature toughness and low-temperature breaking toughness, meets performance and service safety requirement under the low-temperature environment and is suitable for the cold zone under rigor conditions.

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 discloses a bainite steel wheel for a rail traffic D-series high-speed train and a manufacturing method thereof. Chemical components of the bainite steel wheel comprise 0.05-0.30% of C,0.10-1.50% of Ni, 0.01-1.20% of Cr, 0.70-2.10% of Mn, 0.20-1.00% of Si, 0.01-1.00% of W, 0.05-0.60% of Mo, 0.01-0.80% of Cu, 0.01-0.20% of V, 0.001-0.20% of Nb, 0.0001-0.0350% of B, 0.001-0.040% of RE, smaller than or equal to 0.020% of P, smaller than or equal to 0.020% of S and the balance Fe and inevitable residual elements, and the sum of Mn and Cr is larger than or equal to 2.0% and smaller than or equal to 3.0%. According to the bainite steel wheel, the novel C-Ni-Mn-Cr-Mo alloy design system and the alloying principle are adopted, after the wheel is formed and subjected to advanced heattreatment, a rim obtains a no-carbide bainite structure, and the wheel has excellent comprehensive mechanical performance, anticorrosion performance and service performance, and especially has the beneficial effects of being high in strength, high in hardness, high in toughness, high in low-temperature toughness, high in wheeltrack rolling contact fatigue resisting performance (RCF), high in heatcrack resisting performance and the like.

The invention discloses a bainite steel wheel for a rail traffic truck and a manufacturing method of the bainite steel wheel. The bainite steel wheel for the rail traffic truck comprises the followingchemical components: 0.10-0.40% of C, 0.10-1.50% of Ni, 0.25-1.50% of Cr, 0.70-2.10% of Mn, 0.20-1.00% of Si, 0.01-1.00% of W, 0.05-0.60% of Mo, 0.01-0.80% of Cu, 0.01-0.20% of V, 0.001-0.20% of Nb,0.0001-0.0350% of B, 0.001-0.040% of RE, less than or equal to 0.020% of P, less than or equal to 0.020% of S and the balance of Fe and inevitable residual elements; and moreover, 2.0%</= Mn+ Cr</= 3.0%. A novel alloy design system of C-Ni-Mn-Cr-Mo and an alloying principle are adopted, after wheels are formed and subjected to advanced heat treatment, a carbide-free bainite organization structureis obtained, and the wheels have excellent integrated mechanical property, corrosion resistance and service performance, and particularly have the characteristics of high strength, hardness and toughness, high wheel track rolling contact fatigue (RCF) resistance, hot crack resistance and the like.

The invention provides a high-Cr cast iron superior in heat-cracking resistance for an abrasion-resistant member receiving a heat cycle involving an impact, and to provide a heat treatment method therefor. The high-Cr cast iron comprises, by mass%, 2.5-3.5% C, 0.2-1.0% Si, 0.6-2.0% Mn, 11-22% Cr, 1.0-3.0% Mo, 0.01-0.15% N, and the balance Fe with unavoidable impurities, while controlling a ratio Cr/C of a Cr content to a C content into a range of 4.5 to 6.5, and a product Mn*Mo of a Mn content and a Mo content into a range of 1.8 to 2.5. The heat treatment method includes cooling the surface of the high-Cr cast iron at a cooling rate of 5[deg.]C/sec or lower in the step of quenching, to control a residual [gamma] phase in a structure to 30% or less by volume ratio. Thus, the high-Cr cast iron acquires improved heat-cracking resistance.

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 discloses a bainite steel wheel for a rail traffic passenger car and a manufacturing method thereof. The bainite steel wheel comprises the chemical components of 0.08-0.35% of C, 0.10-1.50% of Ni, 0.25-1.50% of Cr, 0.70-2.10% of Mn, 0.20-1.00% of Si, 0.01-1.00% of W, 0.05-0.60% of Mo, 0.01-0.80% of Cu, 0.01-0.20% of V, 0.001-0.20% of Nb, 0.0001-0.0350% of B, 0.001-0.040% of RE, 0-0.020% of P, 0-0.020% of S, and the balance Fe and inevitable residual elements, and in addition, the sum of Mn and Cr is larger than or equal to 2.0% and smaller than or equal to 3.0%. According to thebainite steel wheel for the rail traffic passenger car and the manufacturing method thereof, the novel C-Ni-Mn-Cr-Mo alloy design system and the alloying principle are adopted, after the wheel is formed, advanced heat treatment is conducted, then, the carbide-free bainite structure of a rim is obtained, and the wheel has the characteristics of being excellent in comprehensive mechanical property,corrosion resistance and service performance, high in strength, hardness, toughness, wheel rail rolling contact fatigue (RCF) resistance and hot crack resistance, and the like.

The invention belongs to the technical field of welding materials, and relates to a self-shielded flux-cored wire used for downward welding and horizontal position welding. A flux core of the self-shielded flux-cored wire is prepared from, by weight, 8-10% of manganese, 2-5% of chrome, 0.2-2% of zirconium, 3-8% of aluminum, 5-9% of carbonate, 11-20% of calcium fluoride, 7-10% of calcium oxide, 3-13% of zirconium oxide, 0.5-3% of ferric oxide and the balance iron powder. The manufactured self-shielded flux-cored wire has good plasticity and strength, splatter is little and is fine particle splatter, the welding performance of downward welding and horizontal position welding is excellent, slag detachability and weld seam formability are obviously improved, the content of the S element of deposited metal is very low, and excellent hot-crack-resisting performance is achieved. The self-shielded flux-cored wire is suitable for welding medium and thick steel plates at the same strength level, particularly suitable for welding butt-joint welding seams of a deep groove steel plate and capable of being widely applied to machine manufacturing, building and welding of structural parts with the low requirement for impact toughness.

The invention discloses a cooling core puller. The cooling core puller comprises a core-pulling fixing base and a core pulling body which is detachably connected to the core-pulling fixing base, wherein one end, away from the core-pulling fixing base, of the core pulling body is a shaping end; the shaping end comprises an outer shaping part and an inner shaping part; the outer shaping part surrounds the inner shaping part, and a gap is formed between the outer shaping part and the inner shaping part; a first cooling water channel is arranged in the core pulling body; from the mounting end, away from the shaping end, of the core pulling body, the first cooling water channel sequentially passes through the inner shaping part and the outer shaping part, and finally returns to the mounting endof the core pulling body, so that a cooling water channel with inner and outer layers is formed in the core pulling body, and thus, cooling water uniformly cools the core pulling body by circulatinginside the core pulling body. The shaping end of the core pulling body is a structure with inner and outer layers, and the cooling water channel with inner and outer layers is arranged in the core pulling body, so that the cooling effect of a workpiece is improved, and the surface sintering and workpiece expanding and blocking problem is solved.

The invention provides a tungsten steel ceramic hard alloy and a preparation method thereof, belonging to the technical field of hard alloys. Including: S1. get WC powder, Ni powder and Fe-Si-Al oxide nanopowder and inhibitor and mix uniformly in 97# gasoline to obtain the mixture; S2. add 97# gasoline to the mixture and carry out ball milling, and sieve to obtain Mix the slurry; S3. add carboxymethyl cellulose to the mixed slurry as a forming agent, perform ball milling, and dry to obtain a powder; 4. Put the powder into a mold for extrusion, and dry to obtain a green body; S5. The green body is subjected to discharge plasma sintering, cooled out of the furnace, and sandblasted to obtain tungsten steel ceramic cemented carbide. The tungsten steel ceramic cemented carbide prepared by the present invention has good corrosion resistance, heat resistance and high temperature oxidation resistance, excellent wear resistance, good toughness, strength and bending resistance, high hardness, high density, microstructure Small and uniform, it has broad application prospects.