471results about How to "Improve hot workability" patented technology

The present invention provides a polymeric compound (e.g., a compounded polymeric composition) of highly improved processibility that includes a conventional block copolymer, a controlled distribution block copolymer, and optionally one or more components selected from the group consisting of olefin polymers, styrene polymers, tackifying resins, extending oils, waxes, fillers, and engineering thermoplastic resins. The controlled distribution block copolymer is used as a flow modifier to enhance processability of the conventional block copolymer compound. The polymeric compound of the present invention suffers no reduction in mechanic properties while exhibiting improved processability. One advantage of the present invention is that high performance rubber compounds can be made which can be more easily thermally processed relative to prior art compounds. As such, lower energy consumption, reduced cycle times, reduced part warpage, and/or increasing mold complexity can be achieved.

A Ni-base heat resistant alloy excellent in weldability and strength at elevated temperatures and suited for use in manufacturing cracking furnace tubes and reformer furnace tubes to be used in ethylene plants as well as a welded joint therefor is provided. The alloy of the invention is a Ni-base heat-resistant alloy, which comprises C: not more than 0.1%, Si: not more than 2%, Mn: not more than 2%, P: not more than 0.025%, S: not more than 0.005%, N: not more than 0.04%, Cr: 10 to 30%, Al: 2.1 to less than 4.5%, and Mo: 2.5 to 15% or W: 2.5 to 9% or Mo and W: 2.5 to 15% in total, and satisfies the relation (1) given below:<paragraph lvl="0"><in-line-formula>(104Si+1980P+1980S+9Al+15Ti+11Nb+1.8W+11600B)<={1.1(240-20000S-1900P-30Al-10Ti-9W+17000B) (1)</in-line-formula>In the welded joint of the invention, both of the base metal and weld metal are made of the alloy having the above composition, and the ST value of the weld metal as calculated according to the following formula (2) or (3) is larger by not less than 3 than the ST value of the base metal:<paragraph lvl="0"><in-line-formula>in the case of Ti<=4C; ST-Mo+1.5W+100Ti (2)</in-line-formula><paragraph lvl="0"><in-line-formula>in the case of Ti>4C; ST=Mo+1.5W+400C (3).</in-line-formula>

The invention relates to a method for melting a nickel-base high temperature alloy with an electro-slag furnace. The method includes the following methods: loading materials, welding a high temperature alloy electrode and a false electrode to be smelted together, and placing slag materials at the bottom of a crystallizer; blowing the welded electrodes with inert gases, and closing a protection cover; protecting a smelting closing smoke exhaust valve, and feeding an Ar gas into the crystallizer and the protection cover; striking an arc and melting slag; cleaning smelting slag materials, starting a smelting period, and swinging a slag resistor for less than 0.5 m omega during the smelting process; adding oxidizing agents, and adding metal aluminum powder continuously or at intervals to serve as deoxidizing agents during an electro-slag re-melting process; adopting feeding thorough three stages, power feeding is decreased rapidly, power feeding is decreased slowly, and finally heat is preserved at constant power; and casting a die, cooling and demolding the die. According to the method for melting the nickel-base high temperature alloy with the electro-slag furnace, the surface of a nickel-base high temperature steel ingot has no slag groove defect, and the burning losses of Al and Ti are less than or equal to 5%.

The invention discloses a high cobalt nickel-based high-temperature alloy used at 650 to 750 DEG C and a preparation method thereof, and belongs to the technical field of high-temperature alloys. Thedifficult problem about improving the comprehensive performance of the nickel-based high-temperature alloy with the consideration of alloy performance and use cost in the prior art is solved by precisely controlling the component range of Co in the high-temperature alloy. The alloy is prepared from the components in percentage by mass: less than or equal to 0.1 percent of C, 12 to 20 percent of Cr, less than or equal to 4.0 percent of Mo, less than or equal to 6 percent of W, 12.01 to 25.00 percent of Co, less than or equal to 14 percent of Fe, 4.0 to 8.0 percent of Nb, 0.6 to 2.6 percent of Al, 0.4 to 1.4 percent of Ti, 0.003 to 0.03 percent of P, 0.003 to 0.015 percent of B, and the balance of Ni; the content of a gamma' phase is 15 to 30 mass percent; the content of eta-Ni3Al0.5Nb0.5 is0.5 to 10.0 mass percent. The preparation method of the nickel-based high-temperature alloy comprises the processes of smelting, forging and cogging, and performing heat treatment. According to the high cobalt nickel-based high-temperature alloy and the preparation method thereof, the high cobalt nickel-based high-temperature alloy can be used at the temperature of 650 to 750 DEG C.

The invention relates to duplex stainless steel. The duplex stainless steel comprises the following chemical components in percent by weight: 0.01-0.08% of C, 0.2-1.0% of Si, 1.5-3.5% of Mn, 19.0-21.0% of Cr, 1.2-2.8% of Ni, 0.08-0.18% of N, less than or equal to 0.5% of Mo, less than or equal to 1.0% of W, less than or equal to 1.0% of Cu and the balance of Fe and inevitable impurities; PREN (Pitting Resistance Equivalent Number) is 20-24, the martensitic temperature Md formed by strain induction is 60-130 DEG C. A manufacturing method comprises the following steps of: selecting vacuum induction smelting in an electric furnace, argon oxygen decarburization (AOD) or electric furnace, argon oxygen decarburization (AOD), external refining and LF (Ladle Furnace) smelting; carrying out die casting or continuous casting on molten steel, controlling the superheat degree to be 20-50 DEG C in die casting, matching with fast cooling, preventing nitrogen from escaping, and controlling the overheat degree to be 20-50 DEG C and the plate blank casting speed to be 0.8-2m/min; and putting a die-casting blank or a continuous casting blank into a heating furnace for heating to 1100-1250 DEG C, preserving the heat for 0.5-1.5 hours, processing the die-casting blank or the continuous casting blank on a forging production line or a hot-rolling mill group to the needed thickness, then carrying out annealing at the speed of 0.5-2.5min/mm and the temperature of 1030-1150 DEG C. The obtained duplex stainless steel has excellent corrosion resistance and TRIP effect.

The invention discloses low-carbon high-sulfur free-cutting steel with excellent cutting performance and a manufacturing method thereof, and belongs to the technical field of free-cutting steel. the free-cutting steel contains the following ingredients by mass percentage composition: 0.05 to 0.2 percent of C, 0.6 to 2.0 percent of Mn, 0.04 to 0.1 percent of P, 0.2 to 0.45 percent of S, 0.005 to 0.02 percent of O, less than or equal to 0.02 percent of N, less than or equal to 0.005 percent of Si and less than or equal to 0.001 percent of Al. Generated MnS impurities have the following characteristics: (1) over 95 percent of MnS impurities in as cast steel are Class I MnS, and the proportion of single-phase MnS impurities is equal to or larger than 80 percent; (2) the length of at least 70 percent of MnS impurities in the rolling direction is equal to or larger than 5 micron, and the length-width ratio is lower than or equal to 6; and (3) the average area of MnS impurities in 1 square mm in the rolling direction is no less than 50 square micron. C is adopted for deoxygenation, the cooling rate of ingoting is controlled to range from 2 to 4 mm/min, the roll opening temperature is controlled to range from 1200 to 1250 DEG C, and the roll closing temperature is controlled to be equal to or larger than 1050 DEG C. The low-carbon high-sulfur free-cutting steel has excellent cutting performance. After cutting, the surface fineness of parts is improved. The low-carbon high-sulfur free-cutting steel is generally close to or matches the lead-containing low-carbon free-cutting steel, and is suitable for high-speed cutting.

The invention provides a preparation method for a TiAl alloy plate of a uniform structure and relates to the preparation method for the TiAl alloy plate. The preparation method for the TiAl alloy plate of the uniform structure aims at solving the problems that the structure of an existing TiAl alloy plate is nonuniform, and the comprehensive performance is reduced. The preparation method comprises the steps that 1, blank preparing is conducted to obtain a cuboid TiAl alloy rolling blank; 2, sleeving is conducted to obtain a sleeved TiAl alloy blank; 3, double-step heat treatment is conducted before high-temperature rolling to obtain a TiAl alloy blank subjected to double-step heat treatment; 4, high-temperature rolling and heat preserving during passes are conducted to obtain a TiAl alloy plate subjected to high-temperature rolling; 5, stress relief annealing is conducted to obtain an annealed TiAl alloy plate; and 6, a sleeve is removed through machining, so that the TiAl alloy plate is obtained. The preparation method for the TiAl alloy plate of the uniform structure has the advantage that the TiAl alloy plate of the uniform structure is obtained by adopting double-step heat treatment before rolling. The preparation method is mainly used for preparing the TiAl alloy plate of the uniform structure.

The invention mainly discloses a production process of a nuclear bolt. A 42CrMoE steel material is adopted as a raw material, and the nuclear bolt is produced by blank preparation, heat treatment, surface treatment and flaw detection, wherein the raw material of 42CrMoE comprises the following chemical components by mass percent: 0.38 to 0.48 of C, 0.10 to 0.40 of Si, 0.75 to 1.00 of Mn, no more than 0.025 of P, no more than 0.015 of S, 0.80 to 1.15 of Cr, 0.15 to 0.30 of Mo and the balance of Fe. The product obtained by production in the invention meets the requirements of nuclear 1-stage equipment, nuclear 2-stage equipment and nuclear 3-stage equipment, and the strength, the hardness and the impact resistance all reach standards.

The invention discloses a strong-strength and low-yield ratio steel plate resistant to sulfuric acid dew point corrosion and a manufacturing method for the steel plate. The steel plate comprises the following chemical components in percentage by mass: 0.06 to 0.10 percent of C, 0.15 to 0.50 percent of Si, 0.90 to 1.20 percent of Mn, less than or equal to 0.012 percent of P, less than or equal to 0.008 percent of S, 0.40 to 0.70 percent of Cr, 0.15 to 0.45 percent of Ni, 0.20 to 0.50 percent of Cu, 0.02 to 0.04 percent of Al, 0.02 to 0.05 percent of V, 0.015 to 0.04 percent of Nb, 0.01 to 0.02 percent of Ti, 0.0005 to 0.005 percent of Ca, less than or equal to 0.007 percent of N and the balance of Fe and inevitable impurity elements. The steel plate resistant to sulfuric acid dew point corrosion is directly manufactured by a continuous casting billet of 150mm or more, and the manufacturing method comprises the following steps of heating the continuous casting billet to 1,180 to 1,230 DEG C, preserving heat for 2 to 3 hours, performing rolling after high-pressure water scale removal, cooling the continuous casting billet to 500 to 620 DEG C at the cooling speed of 7 to 15 DEG C/s, and performing straightening and cooling to obtain the steel plate resistant to sulfuric acid dew point corrosion. According to the steel plate and the manufacturing method, a trace amount of Ca, and Nb and V favorable for improving the toughness of steel are added on the basis of Cu-Cr-Ni-Ti anticorrosion, and the content of each element is reasonably set, so that the strength and toughness of the steel are improved on the basis of ensuring the resistance of the steel to the sulfuric acid dew point corrosion, and the yield ratio is lowered.

The invention provides an Al-Mn alloy for high strength heat exchanger and the process for preparing. The composition contents are as follows, including Si<=0.5wt%, Fe<=0.7wt%, Cu0.1-0.3wt%, Mn1.0-1.6wt%, Mg0.3-0.7wt%, Zn0.05-0.3wt%, and Cr0.05-0.15wt%. The method of manufacturing the alloy is to add Si, Fe, Cu, Mn, Mg, Cr and Zn into the industry pure aluminium ingot melt at different stage of temperature, after purifying treatment of the melt, control the cooling rate , cast and acquire Al-Mn line alloy ingot with large scale as-cast grain. After uniformly treatment, the allot ingot is hot rolled at a temperature of 470-510 DEG C and annealed at a temperature of 300-430 DEG C for 1-3h and then cold rough rolled and cold finish rolled, with the deformation of 30-70%, and at least acquire the manufactured product. The adopting states of O treatment state and H24 treatment state are achieved after the annealing of the manufactured product. The Al-Mn alloy has the advantages of good tensile strength, yield strength, elongation, hang-down resistance and low cost, thereby the Al-Mn alloy is the ideal productive material for the component of the heat exchanger.

The invention relates to a tin-containing ferrite stainless steel plate and a manufacturing method thereof. The stainless steel plate comprises the following components in percentage by weight: 0.001 to 0.02 percent of C, 0.001 to 0.02 percent of N, 0.001 to 1 percent of Al, 0.001 to 1.5 percent of Si, 0.001 to 0.5 percent of Mn, 11 to 30 percent of Cr, less than 0.05 percent of P, less than 0.1 percent of S, 0.001 to 5 percent of Ni, 0.001 to 1.5 percent of Cu, 0.001 to 5 percent of Mo, 0.01 to 2 percent of Sn, 0.001 to 2 percent of Ti, 0.001 to 2 percent of Nb, 0.001 to 0.5 percent of Ga, more than or equal to 0 and less than or equal to 1 percent of RE, and the balance of Fe and inevitable impurities. In the manufacturing method, pure tin, pure gallium and rare-earth alloy are added into molten steel after the molten steel is molten by a converter and refined by a vacuum oxygen blowing decarburization furnace and a smelting ladle furnace; and a plate blank is subjected to continuous casting, hot rolling, annealing, acid pickling, cold rolling and thermal treatment to prepare a steel plate. The tin-containing ferrite stainless steel plate manufactured by the method has the advantages of good hot workability, good corrosion resistance and good forming property.

The cutting steel with low content of C and high contents of S and P contains proportionally C, Si, Mn, P, S, N, Ca, Mg, Al, O, and Fe. It is prepared through smelting in electric furnace, conticasting and tandem rolling to become wire and rod. It has high cutting and mechanical performance.

The invention discloses an easy-cutting lead-free brass alloy for forging and a preparation method thereof. The alloy comprises the following components in percentage by mass: 55-68 percent of copper, 0.1-0.8 percent of bismuth, 0.05-0.3 percent of calcium, 0.05-0.3 percent of lithium, 0.05-0.15 percent of sulfur, 0.001-0.1 percent of aluminum, 0.001-0.05 percent of boron, 0.001-0.08 percent of mixed rare-earth elements (one or more lanthanum, cerium and neodymium) and the balance of zinc and unavoidable impurity. The preparation method comprises the following steps: smelting copper-zinc alloy at 1,150 DEG C-1,300 DEG C; after fusant sprays fire, sequentially adding bismuth and zinc rare-earth medium alloy; after the mixture stands and preserves the temperature for 10 minutes, sequentially adding zinc-calcium medium alloy, copper-sulfur medium alloy, the aluminum, copper-boron medium alloy, the zinc and zinc-lithium medium alloy; stirring and deslagging the mixture; preserving the mixture at 1100 DEG C for 15 minutes-20 minutes and casting the mixture at the casting temperature of 1,000 DEG C-1,050 DEG C; preparing an alloy casting blank; and finally casting and molding the obtained casting blank so as to obtain a part blank. An alloy product obtained by the invention has thin crystalline grain, high hot processing performance as well as favorable cutting performance and is suitable for forging.

The invention provides a high-strength high-corrosion-resistant nickel-based high-temperature alloy and a solution and aging heat treatment method thereof, and belongs to the technical field of a nickel-based high-temperature alloy. The alloy comprises the following chemical ingredients in percentage by weight: 40.0-44.0 percent of Ni, 19.5-22.5 percent of Cr, 2.5-3.5 percent of Mo, 1.5-3.0 percent of Cu, 0.10-0.50 percent of Al, 1.9-2.4 percent of Ti, less than or equal to 0.03 percent of C, less than or equal to 0.2 percent of Si, less than or equal to 1.0 percent of Mn, less than or equal to 0.02 percent of S, less than or equal to 0.015 percent of P, 0.001-0.005 percent of Mg, and the balance of Fe and inevitable impurities. The precipitates of a strengthening phase in tissues can be more uniform and fine by means of reasonable solution and subsequent aging treatment, the number of precipitated phases which are not beneficial to toughness and corrosion resistance can be remarkably reduced, and the obdurability and corrosion resistance in high-chlorine-ion marine environments and other severe environments of the alloy can be improved. On the basis of not influencing the structural stability, obdurability and corrosion resistance of the alloy, the content of Fe is increased as much as possible so as to improve the hot workability of the alloy and reduce the cost.

A multi-catalyst system is disclosed. The catalyst system comprises catalyst A and catalyst B. Catalyst A comprises a supported bridged indenoindolyl transition metal complex. Catalyst B comprises a supported non-bridged indenoindolyl transition metal complex. The catalyst system of the invention produces polyolefins which have bi- or multi-modal molecular weight distribution.

The invention relates to a Fe-based austenite alloy oil sleeve, which comprises the following components in percentage by mass: less than or equal to 0.03 percent of C, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, 0.01 to 1.0 percent of Si, 0.01 to 3.0 percent of Mn, 25 to 40 percent of Ni, 20 to 35 percent of Cr, 1 to 5 percent of Mo, 0.1 to 1.5 percent of Cu, 0.01 to 0.5 percent of Al, less than or equal to 0.01 percent of O, and the balance of Fe and inevitable impurities. The 90 to 140 ksi steel-grade Fe-based alloy oil sleeve meeting different well depth requirements of high-acidity oil fields and gas fields is manufactured by thermal extrusion, 1,050-1,180 DEG C of solution treatment and cold rolling of the smelted and forged blanks.

The invention relates to an Ni-saving austenitic stainless steel with excellent processability. The austenitic stainless steel comprises one or two of the following chemical components in percentage by weight: 0.06-0.12 of C, 0.2-1.0 of Si, 7.0-9.0 of Mn, 17.0-18.5 of Cr, 3.01-3.45 of Ni, 0.15-0.22 of N, 0.01-0.2 of Mo, 1.2-1.9 of Cu, B larger than or equal to 0.001% and smaller than or equal to 0.004%, Ca larger than or equal to 0.001% and smaller than or equal to 0.005%, V smaller than or equal to 0.1%, Nb smaller than or equal to 0.1%, and the balance of Fe and unavoidable impurities, wherein the sum of the percentage of C and the percentage of N is larger than or equal to 0.25%. The manufacturing method of the austenitic stainless steel comprises the following steps: heating a smelted and poured casting blank to 1100-1250 DEG C and preserving heat, performing hot working on the casting blank until a needed thickness is obtained, wherein the heat preserving time is more than 30min; after hot working, annealing at a controlled temperature of 980-1100 DEG C and washing the blank with any acid, and performing cold rolling, wherein when Md30/50 is larger than or equal to -30 DEG C and smaller than or equal to 0 DEG C, the maximum cold rolling deformation is 75-80%; or when Md30/50 is smaller than or equal to -30 DEG C, the maximum cold rolling deformation is 80-85%. According to the invention, the cold working performance of the Ni-saving austenitic stainless steel is improved; the corrosion resistance is close to that of type 304, and meanwhile the cost is lower than that of the type 304.