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Rapid cycling 45 steel annealing of the ball

Completely even distribution, but also led to the coarsening of carbides and the size difference of the narrowing. The carbide coarsening, so that austenite gradually slow down the process. This solid 4 cycles of quenching due to the hardness and size of cementite with the increase of the cycle, so that short time austenitizing heat (12s) formed during the austenite volume fraction decreased, carbon content decreased, resulting from the austenitizing No. 8 Yang Renshan; 45 steel balls of rapid cycling of annealing temperature of 45 the hardness after quenching after the first cycle down to the seventh cycle HRC56 after HRC31. Obviously, this is the first time to the austenitic flake and small granular cementite dissolution,[link widoczny dla zalogowanych], without dissolving the coarse cementite in the subsequent cooling of isothermal coarsening process of growing up. So with the increase of the cycle, the particle size of cementite increases, leading to the formation of the subsequent reduction of the carbon content of austenite, the lower the hardness of martensite after quenching. 4 Conclusion (1) steel 45 doctors from the critical temperature of cooling, the formation of globular cementite and austenite in the austenite temperature range of uniform composition degree, spherical retaining undissolved cementite is a necessary condition for the ball. Use of rapid heating, insulation can broaden short austenitizing Asia steel balls were off temperature range. (2) 45 balls of the most appropriate austenitizing annealing norms 75O ℃ ~ 77O ℃ insulation 128, which can be conducive to the subsequent decomposition of austenite formation of globular cementite. Compared with the hot rolling, the hardness is lower and the hardness can be reduced to HRB83. (3) As a result of rapid heating uneven degree of austenite increases, so the critical temperature in the sub-yu of the fire cycle can be greatly reduced severance. (4) 45 steel balls of rapid cycle annealing best practices are: rapid heating to 75O ℃ ~ 77O ℃ 128 austenitizing at 700 ~ C ISOTHERMAL 10mln, according to general requirements for cycle 2 to 3 times. For further reduce the hardness and improve the performance of cold plastic deformation, the cycle 4 to 6 times to meet the processing requirements. Cycle ball annealing process cementite spheroidization and coarsening of the ball than the isothermal annealing much faster. (5) rapid cycle annealing process with the conventional spherical ball of energy, fire techniques can be more than 25%, compared, and the process is simple, stable quality. References 【1] GeibM. D. etalTheEffect: ofInter-critica1AnnealingTemperatureo1 \MetalTr ~ ns. 1960,[link widoczny dla zalogowanych], A11 (1D) I1685 [2] stable Saran. High-speed rapid canopy ring actinium annealed process. 1986 (4) I37 VAI of Austria's new law a hot strip rolling mid Conro1180, VAI (Voest-AlpineInd,[link widoczny dla zalogowanych]! ustrieanlagenbauGmbH) company began research Pina thin slab casting and rolling technology, and to be successfully developed in 1988 sheet, plate combination of rhyme continuous casting machine,[link widoczny dla zalogowanych], developed on this basis Conroll method (ie, thin slab casting and rolling technology), for the production of low carbon steel, stainless steel hot-rolled strip steel. Conroll production process and equipment as follows: 1 set with a vertical slab continuous casting machine mold (single stream) production of thick 7O classes Tsui, wide 80O ~ 180Omm the billet, the casting speed of 1.5 ~ 4.0m/rain . VAI company that slab thickness of 70mm is to ensure the lowest energy consumption, product quality and the best the best thickness. Thin slab cooled by high pressure water descaling machine descaling entered a station ÷ 5O0 ~ 600mm / ~, lOOOmmX1700mmSGC ~ 1. , Machine (billet gauge control machines), rolled into 50mm thick slab. Depending on the weight of the stock coil cut a certain length into the roller hearth furnace heated to 1100 ~ I150 ~ C, and then enter the finishing mill (8. Can ~ 800mm / ~ 1350mmX1900ram4 mill, equipped with hydraulic AGC, bending roll,[link widoczny dla zalogowanych], work roll axis Stream Mobile and other devices), rolled into a thick 1.5 ~ l6 coffee, wide 1600mill, hot rolled strip coil weight 30t. The production capacity of the production line 90 to 1.8 million t / a, the production of varieties, mechanical properties, surface quality all reached conventional rolled product requirements, but in energy consumption, production cost and so much lower than conventional production. Wei Liqun Quoted \
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