Heat Treated Steel Bar And Tube
HEAT TREATED STEEL BAR AND TUBE
Heat treated steel bar is produced by heating and cooling in different temperature based on the steel grades to improve the steel bar mechanical properties or machinability for various industrial applications. Heat treated steel bar includes annealed steel bars, Normalized Steel Bar, quenched and temper qt steel bar.
Annealed Steel Bar has better ductility and lower hardness, which can be easier to be machined. The annealing processing is usually widely used for steel grade with higher carbon content above 0.5%. However, some low carbon steel also requires to do annealing for special usage such as 20CrMnTi gear steel. For some special material such as 20CrMnTi gear steel and GCr15 such bearing steel, spheroidizing annealing is often required.
Normalized steel bar sometime is also one kind of annealing processing. It mainly changes the grain to remove the impurities in steel and improves the strength and hardness. For some hot rolled steel bars, to keep the basic mechanical properties, normalizing is often used.
Quenching and Tempering, abbreviated as Q&T is a king of processing that strengthen or harden steel bars by heating the materials and then cooling in water, oil or other liquid medium, that rapidly the change from austenite to perlite to get the proper properties for various usage. The quenched & tempered steel bar materials are usually with carbon from 0.30% - 0.60%, it is widely used as merchant bars in components of various machines.
Our advantages on producing heat treated steel bars:
1) Big stocks of hot rolled round bars or wire rods as raw materials
2) Wide range of Cold Drawn Steel Bar sizes: from 10mm to 150mm
3) Different cold drawing medias powder or oil to get different surface
4) Straightening machines to get better straightness up to 0.5mm/m
5) Grinding and polishing machines to get better roughness upto 0.4um
6) Heat treating furnaces to adjust the mechanical properties
7) Full sets of testing equipment to test the sizes, mechanical properties and microstructure.
8) Multiple packages to avoid broken packages and anti-rusty
Astm A193,Round Steel Tubing,Heat Treated Steel Tube,Heat Treated Steel Bar And Tube SHANDONG LE REN SPECIAL STEEL CO., LTD. , https://www.sdhighstrengthsteelbolts.com
2, CFD, PIV and other advanced technologies combined with the actual experimental research CFD and other advanced technology, it is undeniable that colleges and universities now have software, are calculating, more than 50% graduate students are related topics. A new technology developed from a mature process, the current should be used as a practical solution to practical engineering problems, with the use of traditional design methods. In addition to try to combine the actual, otherwise it is difficult to mature and improve. Do not choose the title at the beginning too large, and some choose a pump from the import count to export, a pumping station from the sink into the pool, this calculation is difficult to judge. Like the wear parts of the slurry pump, the vortex parts of the inlet runner, etc., are well suited for research using CFD and PIV techniques. In addition, some large pump factories should cooperate with qualified institutions to carry out research in this field.
3, pay attention to key technologies and key product research and development To improve the technical level of the pump must solve the key technical issues. For example: Slurry pump wear mechanism research; High efficiency slug pump hydraulic model research; Self-priming pump to simplify the structure and improve the efficiency of research; Easy to repair high efficiency, high flow, high-lift mine drainage pump and pump research and development; Research and development of marine pumps; research and development of large-scale flue gas desulfurization pumps and high-temperature and high-pressure pumps for liquefaction of coal; research on reliability improvement of shielded pumps and magnetic pumps; research and development of new metering pumps (diaphragm pumps); Research and so on.
4, the use of composite technology to achieve innovation and development of pump technology Throughout the development of pump technology, many are the result of composite technology. E.g:
(1) The combination of centrifugal impeller and vortex impeller becomes a centrifugal vortex self-priming pump.
(2) jet nozzle and centrifugal pump combined to become a centrifugal jet self-priming pump.
(3) The combination of pump impeller and turbine runner, to become a water pump.
(4) centrifugal pump and piston diaphragm pump combine to form a strong self-priming pump.
(5) The inducer and the centrifugal wheel combine to improve the cavitation resistance of the pump.
(6) Double suction impeller and single suction impeller combine to solve the cavitation and axial force balance.
(7) the length of the blades combined use to solve the plug impeller import and export proliferation issues.
(8) short blade to the back of the long blade side of the Department to prevent the axial vortex and outlet flow separation.
(9) Downloading of low-lift impeller lifting liquid, loading high-lift impeller pressurized long-axis liquid pump (double-wheel liquid pump), to solve long axis liquid pump manufacturing difficulties, unreliable operation (see Figure 4).
(10) The mechanical seal static and dynamic ring installed in the last impeller seal ring at the end, as axial force balance device, the use of impeller pressure balance before and after the balance of axial force, as can solve the dynamic and static ring Wear problems, economic benefits are significant.
(11) The principle of the balance disc is moved to the impeller rear cover, due to the formation of radial and axial two gaps, the balance disc can be the same as the automatic balance of axial force. When the axial force is large, the impeller moves toward the inlet, the axial clearance increases, the pressure behind the impeller decreases, and the impeller moves backward. vice versa.
(12) paste packing seal, the seal of the United States, the first company to use Redstone, and sales in China, it is graphite, fiber, tetrafluoroethylene, silicone and other components of the paste, the use of the process, you can use Injection gun injection (supplement). It is said that in some cases, the effect is good. Although not yet available for use on all pumps, this is a valuable idea that promises to be a breakthrough in sealing technology.
(13) Slurry pump impellers, with twisted blades, may reduce wear due to compliance with flow conditions and increase efficiency.
There are numerous successful examples of using composite technologies. To make good use of living composite technologies, it requires a wide range of knowledge and dares to innovate. 
Note that the discovery and development of new areas with a pump pump is a universal machine, a very wide range of applications, and new areas continue to appear with the pump. For example: heart pump, water pump, computer cooling pump, air conditioning pump, thermal oil pump, oil and gas mixing pump, flue gas desulfurization pump, oil platform injection pump . There may still be places where pumps should be used without pumps, and new areas of pumps will continue to emerge, which requires our attention and discovery.