36results about How to "Lower freezing temperature range" patented technology

The invention discloses a preparation method for a metal glass composite pipe, which belongs to the technical field of preparation of composite pipes. According to the invention, a self-propagating aluminum thermal reaction of aluminum and iron oxide is taken as a processing technology; cryolite is added at first, so the reaction is allowed to be safely carried out in virtue of the dilution effect of cryolite, and the fluidity of a system is improved by using cryolite, thereby facilitating a fusion product to be evenly distributed on the inner wall of a hot-rolled seamless steel pipe under the action of centrifugal force; then a small amount of borax is added, which is favorable for discharging gas in the system in an adequate period of time, reducing the possibility of shrinkage formation, so the density of the inner wall of the product is improved and a smooth and bright glass layer is formed; finally, the inner wall of the hot-rolled seamless steel pipe is welded with the fusion product of the self-propagating aluminum thermal reaction, so good metallurgical bonding of the transition metal layer and the steel pipe is prepared; and thus, the metal glass composite pipe is prepared.

The invention discloses a high-throughput continuous casting and rolling aluminum-magnesium-manganese alloy plate for ships and a production process thereof. The chemical composition of the aluminum-magnesium-manganese alloy is calculated by mass percentage: Mg: 0.80-2.80%, Mn: 0.00-1.40 %, Zr: 0.10‑0.50%, Cr: 0.15‑0.35%, Sr: 0.00‑0.10%, Er: 0.00‑0.60%, Si: 0.10‑0.40%, Cu: 0.01‑0.10%, Ti: 0.01‑0.05% , Fe: 0.00‑0.40%, the balance is Al. The production process mainly includes smelting and melt treatment, continuous casting, continuous rolling and cold rolling process. This invention solves the problem of high-throughput continuous casting and rolling to produce aluminum for ships Magnesium-manganese sheets have problems such as easy segregation, low strength and toughness, and poor formability.

The invention relates to a tungsten electrode argon arc welding solid cored welding wire used for welding ultralow-temperature high manganese steel. According to the technical scheme of the solid cored welding wire, the tungsten electrode argon arc welding solid cored welding wire used for welding the ultralow-temperature high manganese steel comprises the chemical components of 0.25-0.55 wt% of C, 23-26 wt% of Mn, 8-10 wt% of Ni, 3-5 wt% of W, less than or equal to 0.002 wt% of P, less than or equal to 0.001 wt% of S and the balance Fe and inevitable impurities. The solid cored welding wire is low in price of alloy element content and simple in alloy component system; and formed weld metal has good low-temperature toughness, and the strength of the weld metal is matched with the ultralow-temperature high manganese steel, and the technical requirements for the strength and ultralow-temperature toughness of LNG devices and other devices prepared through welding.

The invention relates to a melting electrode gas shielded welding wire suitable for the working temperature of -196°C. The technical solution is: the chemical composition of the metal gas shielded welding wire is: C is 0.30~0.55wt%, Mn is 24~26wt%, Ni is 6.4~8.2wt%, W is 2.5~4.0wt%, P≤0.002wt%, S≤0.001wt%, the balance is Fe and unavoidable impurities. The invention has low preparation cost and simple alloy composition system; the formed weld metal has the characteristics of ultra-low temperature and high toughness, its strength matches that of ultra-low temperature high manganese steel, and the welded joint has high strength and excellent mechanical properties of ultra-low temperature toughness, which can meet the requirements of Specifications for strength and cryogenic toughness of devices to be welded at ‑196°C.

The invention discloses a 3D printing repair ink material and method suitable for rolling steel products. The ink material is a powder material, which is characterized in that it contains: C: 0.4wt%, Fe: 89wt%, Si: 0.2wt%, Mn : 3wt%, Cr: 2wt%, V: 0.4wt%, W: 1wt%, Ti: 1wt%, and the rest are impurities. The 3D printing process uses a selective laser sintering process or a laser selective melting process. The invention uses a reasonable 3D printing process to clad the metal powder on the repaired surface, restore the geometric size of the base material without changing the physical and chemical properties.

A process for preparing compact thick protection layers on magnesium alloy surfaces, which includes steps of surface pretreatment, flame plating alloy powder, laser remelting and the like, is added with a surface pretreatment procedure of deoxidation galvanization, and reasonably determines key process parameters. The process is particularly characterized in that solution of the deoxidation galvanization is water solution prepared by hydrofluoric acid (50ml / L) and zinc sulfate heptahydrate (50g / L), time of the deoxidation galvanization procedure ranges from 15 seconds to 20 seconds, preheating temperatures of primary plating and secondary plating of the flame plating are respectively 60-120 DEG C and 150-200 DEG C, laser power of the laser remelting ranges from 1250 W to 1500 W, scanning speed thereof is 500mm / min, and light spot diameter thereof is 4mm. The thickness of a protection layer obtained by preparing flame plating aluminium-silicon alloy powder and laser remelting achieves over 1.5mm, the protection layer is compact in structure without shortages of pores and the like, rigidity of the protection layer ranges from 225HV to 270 HV( which is 4.5-4.9 times of that of a substrate, the thickness direction of the protection layer seldom changes, the component (by mass percentage) of the protection layer is 33.77-53.35Al-62.04-40.76Mg-4.19-5.89Si, and boundaries of the protection layers are in alloy combination.

The invention provides a tin-based bearing alloy, which is composed of copper with a weight percentage of 5.5% to 6.5%, antimony with a weight percentage of 10% to 13%, zinc and tin with a weight percentage of 0.3% to 0.8%, The present invention also provides a preparation method of the tin-based bearing alloy. First, 50% tin, all copper and antimony are put into a furnace for mixing and melting, and after complete melting, all zinc is added at 500-550°C. After the zinc is completely melted, add the remaining tin. After the alloy is completely melted, stir and stand for 15-30 minutes. The final casting temperature is 360-450°C. The invention improves the strength and hardness of the tin-based alloy, can reduce the solidification temperature range, improve the fluidity, reduce the dispersed shrinkage cavity, reduce the gas content in the alloy liquid, and reduce the pore defects in the casting. The corrosion resistance, oxidation resistance and uniformity of the alloy improve the toughness and strength of the alloy.

The invention relates to the technical field of bearing alloys, in particular to a preparing method for a tin-based bearing alloy. The preparing method comprises the following steps that a, a pure tiningot, a pure copper ingot, a pure antimony ingot, a pure aluminum ingot and the like are subjected to burdening according to the mass percent content of various components in the tin-based bearing alloy; b, 1 / 2 of the pure tin ingot in the above accessories is placed at the bottom of a crucible, then, 50% of a tin-silicon alloy, 10% of a tin-titanium alloy and pure boron powder are sequentiallyadded, after heating melting, the left pure tin ingot is added for temperature adjusting, and finally, the pure copper ingot, the pure antimony ingot and the pure aluminum ingot are added; c, when theheating temperature is stably increased to 500-550 DEG C, a comprehensive treatment agent can be added for refining modification treatment, and standing is conducted for a period of time after drossing; and d, a steel ingot die is preheated, alloy tin liquid obtained through the step c is poured into the steel ingot die, and cooling is conducted to the room temperature. According to the preparingmethod, the solidification temperature range can be narrowed, mobility is improved, dispersed shrinkage is reduced, the content of gas in the alloy liquid is reduced, and the air hole defect in castings is reduced.

The invention discloses an environment-friendly high-load-bearing tin-based Babbitt alloy material for arc deposition, which solves the problems of poor load-bearing capacity and low fatigue strength of the existing Babbitt alloy, and comprises the following components in mass percentage: Sb: 6 ‑15%, Cu: 2‑8%, Zn: 0.1‑3.0%, Ag: 0.1‑2.0%, the balance is Sn; after arc deposition, the average size of tin-based babbitt alloy square SnSb phase is less than 10um, dispersed The Cu6Sn5 phase does not have any orientation. In the present invention, Zn and Ag are added to the tin-based babbitt alloy to replace the currently commonly used babbitt alloying elements As, Cd and other elements that have great pollution to the environment. The babbitt alloy of the present invention not only refines the crystal grains, It improves the wear resistance, and also has excellent toughness and weldability; it can greatly reduce spatter when used in the arc deposition process, the appearance of the weld is beautiful and tidy, and the resulting deposited layer has a strong bearing capacity and high fatigue strength.