65results about How to "Improve temper resistance" patented technology

The present invention provides a steel plate with great heat and abrasion resistance and a manufacturing method thereof. The steel plate comprises the following chemical composites, in percentage by weight: 0.10-0.30% of C, 0.10-1.50% of Si, 0.50-2.00% of Mn, 0-0.015% of P, 0-0.010% of S, 0.2-2.00% of Cr, 0.10-1.50% of Mo, 0-1.00% of Ni, 0-0.10% of V, 0-0.10% of RE, 0-1.00% of W, 0.010-0.080% of Al, 0.0005 -0.0040% of B, 0-0.080% of Ti, 0.0010-0.0080% of Ca, 0-0.0080% of N, 0-0.0080% of O, 0-0004% of H and the balance being Fe and inevitable impurities. The mechanical properties of the steel plate are that the Brinell hardness is greater than 360HB, and the 500 DEG C tensile strength is more than 1000MPa. The steel plate obtained by the various components through processes such as quenching and tempering has excellent mechanical properties and abrasion resistance, and is particularly suitable for various mechanical parts which are easy to wear while working under high temperature.

The invention discloses alloy steel SDH55 for shield machine tools and a production method thereof. The alloy steel comprises, by weight, 0.4% to 0.55% of C, 0.10% to 0.40% of Si, 0.10% to 0.30% of Mn, 5.10% to 6.50% of Cr, 2.20% to 3.00% of Mo, 0.45% to 0.85% of V, the balance of Fe and unavoidable impurity elements, including not greater than 0.005% of S and not greater than 0.010% of P. The alloy steel high in wear resistance and high in toughness is made by means of matching, smelting, casting and electroslag remelting, by thermal feeding for high-temperature homogenous treatment after demolding, and by means of multidirectional forging, soft annealing and ultra-fining treatment; the problem that the current tools for shield machines are of short lives due to wear and failure and edges cracking caused by low toughness is solved; the alloy steel is of great significance to the development of the industry of special steels of shield machine tools.

The invention relates to a high-wear-resisting cold roll. Chemical components in the cold roll comprise, by weight percentage, 0.80%-1.20% of C, 0.4%-1.20% of Si, 0.20%-0.50% of Mn, 7.50%-9.00% of Cr, 0.20%-1.00% of Mo, 0.05%-0.50% of V, less than or equal to 0.40% of Ni, less than or equal to 0.015% of S, less than or equal to 0.015% of P and the balance Fe and inevitable impurities. The high-wear-resisting cold roll has the high wear resistance; and under the same using condition, the service life of the roll is prolonged by more than one time than a roll made of original common chrome steel system materials.

The invention relates to a steel and a production technique thereof, in particular to a non-carbide bainite wear-resistant steel plate and a production technique thereof; the component weight percentages are: 0.15 to 0.25 percent of C, 1.50 to 2.00 percent of Mn, 0 to 0.015 percent of P, 0 to 0.006 percent of S, 1.30 to 2.00 percent of Si, 0.20 to 0.60 percent of Al, 0.60 to 1.00 percent of Cr, 0.25 to 0.50 percent of Mo, 0.010 to 0.035 percent of Nb and the rest is Fe. The production technique is carried out according to the following working procedures: (1) feeding a continuous casting plate to a heating furnace for heating; (2) feeding the continuous casting plate after being heated into a hot rolling production line to carry out the rolling of controlled rolling and controlled cooling; (3) carrying out middle-low temperature drawing temper on a rolling steel plate after the rolling is finished. The non-carbide bainite wear-resistant steel plate can be produced by the working procedures without carrying out online or offline hardening and tempering thermal processing which not only can simplify the working procedures of production, but also can improve the performance and the quality of a product as well as obtain the bainite wear-resistant steel with high intensity and high toughness.

The invention belongs to the technical field of forge piece machining, and particularly relates to a large alloy steel forge piece water cooling quenching tempering technology. The provided large alloy steel forge piece water cooling quenching tempering technology comprises the following steps including discharging, forging, heat treatment after forging, rough turning, ultrasonic detection, watercooling quenching tempering, sampling detection, finish turning and final checking. A specific control scheme is provided for water cooling quenching of medium-low-carbon alloy steel, medium-high-carbon alloy steel and tool and mould steel forge pieces, the water cooling quenching crack risk is greatly reduced, and pollutant emission in the quenching process is reduced. Meanwhile, the mechanical performance of a forge piece body completely meets the technical requirement. Particularly, for the same product with the through quenching layer depth requirement, high-cooling-rate water is adopted for quenching cooling, a deeper through quenching layer can be obtained compared with adoption of organic quenching liquid and quenching oil for cooling, and accordingly tempering resistance and comprehensive mechanical performance of the forge piece are improved.

The invention provides a heat treatment process for surface hardening and carbonitriding of hydraulic parts, which includes the following steps: a washing the hydraulic parts preparing for heat treatment to remove greasy dirt; b warming a carburizing multi-purpose furnace, and performing pre-carburizing treatment; c putting the hydraulic parts washed cleanly through the step a in the carburizing multi-purpose furnace, and performing strong carburizing; d adjusting carbon potential after the strong carburizing to perform diffusion; e putting the hydraulic parts after carbonitriding in the stepd in a quenching chamber of the carburizing multi-purpose furnace to be quenched, filtering oil and discharging from the furnace; and f washing the hydraulic parts of the step e, and putting the hydraulic parts in a tempering furnace to be tempered to obtain products.

The invention provides an optimization method and a processing step of high-end hot work die steel. On the basis of national standard die steel H13, an optimized raw material formula, an optimized melting process and an optimized heat treatment process are adopted, and the high stability of the H13 is combined, so that heat fatigue resistance and tempering resistance are further improved, better hot strength and toughness are realized, and the service life of a die is remarkably improved. The optimization method and the processing step of the high-end hot work die steel have the following characteristics and advantages of (1) high purity and prolonged fatigue life of the die; (2) high isotropy and excellent shock cracking resistance; (3) excellent toughness and excellent wear resistance; (4) excellent hardenability and dimension stability during high-temperature heat treatment; and (5) excellent hot flush corrosion resistance and excellent hot fracturing resistance.

The invention discloses a micro-nano particle reinforced wear-resistant corrosion-resistant laser cladding layer and a preparation method thereof. The micro-nano particle reinforced wear-resistant corrosion-resistant laser cladding layer is prepared from Fe-based metal powder and WC particles added into the Fe-based metal powder, wherein the particle size of the iron-based metal powder and the particle size of the Fe-based metal powder are consistent, the mass percent of the WC particles added into the Fe-based metal powder is 10-30%, and the Fe-based metal powder is prepared from C, Fe, Cr, Si, Mn, Mo and V. The prepared micro-nano particle reinforced wear-resistant corrosion-resistant laser cladding layer has the advantages of being high in hardness, excellent in sliding friction wear resistance, impact abrasive wear resistance and salt fog corrosion resistance and capable of effectively prolonging the service life of components in electric power, petrochemical engineering and machinery industries, and in addition, the preparation method is simple.

A fully dense, powder-metallurgy produced maraging steel alloy article of prealloyed powder for use as a tool for high temperature applications. The article in the as-produced condition having a hardness less than 40 HRC to provide machinability and thereafter the article upon maraging heat treatment having a hardness greater than 45 HRC. A method for producing this article comprises compacting prealloyed powder to produce a fully dense article having a hardness less than 40 HRC and thereafter maraging heat treating to a hardness greater than 45 HRC.

The invention provides a preparation method of a rolling bearing. Inner and outer rings and a retainer of the rolling bearing are made of a nodular cast iron material instead of bearing steel. A new casting method is provided for preparing nodular cast iron pipe blanks for the rolling bearing. Great change is made for material selection, the hot processing technology and hardness of the inner and outer rings and the retainer of the rolling bearing so as to combine the advantages of the rolling bearing and a self-lubricating sliding bearing. The self-lubricating sliding bearing which can operate under the working conditions of low rotational speed, high working temperature, not frequent injection of lubricating grease and frequent impact is provided for the metallurgical machinery and other equipment manufacturing fields.

The invention relates to high-strength high-toughness wear-resisting steel for excavator bucket teeth and a manufacturing method thereof. The high-strength high-toughness wear-resisting steel comprises the following components in percentage by weight: 0.23-0.27% of C, 0.001-0.025% of P, 0.90-1.20% of Si, 0.001-0.025% of S, 2.20-2.60% of Mn, 0.10-0.30% of Cr, 0.30-0.40% of Mo, 0.10-0.30% of Cu, 0.08-0.12% of V, 0.10-0.30% of Ni, 0-15*10<-4>% of [O], 0.015-0.040% of Al and the balance of Fe and inevitable impurities. The invention also provides the manufacturing method of the steel for the excavator bucket teeth. The prepared low carbon silicon-magnesium-molybdenum-vanadium alloy has high strength, high toughness and high purity and is used for forging the excavator bucket teeth working in severe environments.

The invention relates to an ultrahigh-strength TiCN-base Co-containing steel-bonded hard alloy threading tool capable of coating and a preparation method. The preparation method is characterized by comprising the following steps that the ultrahigh-strength TiCN-base Co-containing steel-bonded hard alloy threading tool takes Co-containing Fe-Mo-Cr alloy steel as a matrix, and TiCN with the mass fraction of 20-35% is added as a hard phase; the surface of powder is activated by adopting the method that quantitative preoxidation oxygen aeration is carried out after high-energy ball milling, the sintering activity of the matrix is improved, then the oxygen content (less than 800 ppm) is reduced substantially by a carbon and oxygen reduction reaction in the sintering process, and the sintering temperature is reduced; and the tempering resistance, the PVD coating property, the strength and the toughness of the ultrahigh-strength TiCN-base Co-containing steel-bonded hard alloy threading tool are improved by leading in a strengthening element of Co. The ultrahigh-strength TiCN-base Co-containing steel-bonded hard alloy threading tool has high strength (2800-4000 MPa) and high toughness (alpha k is equal to 7-15 J/cm2, KIC is equal to 20-28 MPa.m1/2), the limitation that a traditional steel-bonded hard alloy is only used for mid-and-low-end wear-resistant pieces can be broken through, and threading tools such as a PVD coating and squeezing screw tap and a cutting screw tap which are more wear-resistant than high-speed steel and are more edge-breaking-resistant than hard alloy are prepared.

The invention discloses an energy-saving burner for premixed fuel gas to be burnt at a positive pressure and a steam generator. According to the burner, a burning surface of the burner is made from aludirome fabric; cooling devices are arranged in the circumferential direction along the edge of the burning surface; the fuel gas and air are completely mixed through a mixer and a premixing cavity, and are burnt at the positive pressure on the surface of the aludirome fabric. The problems that tempering is easily caused in positive-pressure burning, and ignition detonation is easily caused in premixed and enclosed burning are solved, and the burning process is safe and reliable. The burner is adopted in the steam generator; the mixed gas is rapidly burnt out in minimal sealed space formed between a burning part and an inner container of the steam generator, steam is generated fast, and waste heat produced during the steam generating process is effectively utilized; the sealed and premixed burning manner and the reasonable connection of all components enable the size of the steam generator is much less than that of the conventional steam generator; meanwhile, automatic drainage control effectively depresses and relieves the formation of water scale after the conventional steam generator is used for a long time.

The invention discloses high-strength anticorrosion steel for a gas valve. The high-strength anticorrosion steel is composed of, by mass, 0.02-0.04% of C, 10.5-11.7% of Cr, 0.15-0.19% of Si, 0.62-0.73% of Mn, 0.45-0.52% of Ni, 0.15-0.17% of Re, 0.27-0.38% of Nb, 0.31-0.33% of Al, 0.11-0.13% of Y, 0.13-0.15% of Ti, 0.75-0.77% of Ca, 0.82-0.88% of B, 0.41-0.45% of Co, 0.23-0.31% of Mo, less than or equal to 0.03% S, less than or equal to 0.02% of P, 0.23-0.36% of rare earth metal and the balance Fe. The alloy elements of Co, Mo, Cr and Ti in the high-strength anticorrosion steel can improve the martensite tempering resistance and suppress dislocation substructure recovery; and Ni can improve the toughness of ferrite matrixes and refine crystal particles, the plasticity and toughness of the steel can be improved, the cleavage tendency is reduced, the nuclear driving force of Mo2C is improved through Co, and precipitation of fine and dispersed compounds containing Mo is facilitated.

The invention discloses an outdoor high-strength corrosion-prevention steel plate, and relates to the technical field of metal smelting. The outdoor high-strength corrosion-prevention steel plate comprises, by mass, 0.23%-0.38% of C, 1.24%-1.36% of Co, 0.91%-1.34% of Ni, 4.12%-5.36% of Cr, 0.86%-1.32% of Mo, 0.55%-0.57% of Al, 0.42%-0.78% of Ti, 0.13%-0.18% of Si, 0.09%-0.14% of Ge, 0.13%-0.16% ofW, 0.16%-0.21% of Re, 0.31%-0.34% of N, 5.21%-5.89% of rare earth elements, and the balance Fe and inevitable impurities. The invention further discloses a processing technology of the outdoor high-strength corrosion-prevention steel plate. The strength and toughness of the steel plate are effectively improved; and meanwhile the corrosion resistance of the steel plate is improved, and thus the service life of the steel plate is effectively prolonged.

The invention discloses a high-strength duplex stainless steel. The high-strength duplex stainless steel comprises the following chemical components in percentage by mass: C which is smaller than or equal to 0.03%, 16.0-16.5% of Cr, 2.1-3.3% of Ni, 0.31-0.35% of Mn, 1.2-2.2% of Mo, 0.24-0.31% of Co, 0.39-0.41% of Si, 0.14-0.16 of Nb, 0.17-0.19% of Ti, 0.12-0.15% of Ge, 0.52-0.54% of Cu, 0.25-0.31% of V, 0.05-0.07% of Ca, 0.15-0.19% of Re, 0.17-0.19% of Se, 0.015-0.025% of S, 0.021-0.023% of P, 5.5-6.6% of rare earth elements, and the balance of Fe and inevitable impurities. An corrosion-resistant plate made of the high-strength stainless steel disclosed by the invention not only is high in tensile strength and yield strength, but also high in corrosion resistance; and the rare earth elements are added, so that the interaction between a corrosive medium and the stainless steel is avoided, and besides, the extensibility of the stainless steel plate is improved, the functions of eliminating bubbles caused by hydrogen in steel ingots and reducing cracks in steel billets are added, and particles are refined.

The invention belongs to the field of material processing, and relates to a preheat treatment process for a super-strong high-toughness carburizing steel bar and a forge piece, which comprises the following steps of: firstly, carrying out primary high-temperature tempering on the bar and the forge piece which are subjected to thermoplasticity forming at the heating temperature of 670-710 DEG C and the heat preservation time of 8-20 hours, and carrying out furnace cooling or air cooling to room temperature; then incomplete annealing is conducted, the heating temperature ranges from 950 DEG C to 1000 DEG C, the heat preservation time ranges from 1 h to 3 h, and furnace cooling or air cooling is conducted to the room temperature; and finally, secondary high-temperature tempering is conducted, the heating temperature ranges from 670 DEG C to 710 DEG C, the heat preservation time ranges from 8 h to 20 h, and furnace cooling or air cooling is conducted to the room temperature. Through the pre-heat treatment, the structure inheritance caused by high-temperature heating before the super-strong high-toughness carburizing steel bar and the forge piece are subjected to plastic forming is eliminated, fine crystal grains are obtained after final heat treatment, the hardness of the bar or the forge piece is reduced, the residual stress is eliminated, and the cutting machining performance is improved.

The invention discloses a high-strength torsion resistant steel, and relates to the technical field of metal smelting. The high-strength torsion resistant steel comprises, by mass, 0.22%-0.49% of C, 1.25%-1.38% of Co, 0.88%-1.34% of Ni, 4.57%-5.45% of Cr, 0.96%-1.35% of Mo, 0.53%-0.59% of Al, 0.58%-0.78% of Ti, 0.16%-0.19% of Si, 0.09%-0.14% of V, 0.13%-0.16% of W, 0.06%-0.09% of Nb, 0.004%-0.009%of Ca, 0.12%-0.26% of Mn, 0.06%-0.09% of styrene-butadiene-styrene block copolymer, 1.66%-2.53% of rare earth elements and the balance Fe and inevitable impurities. The invention further discloses apreparation method of the high-strength torsion resistant steel, and the strength and toughness of the steel can be improved effectively; and the phenomenon that the steel is liable to be twisted offby external force is avoided.