A Method of Preventing Collapse of 65mn Hot Rolled Coil by Using Phase Change Thermal Expansion
A technology of hot-rolled coils and phase transformation heat, applied in metal rolling, temperature control, etc., can solve problems such as discontinuous thermal expansion, achieve low cost, improve production efficiency, and optimize physical quality
Inactive Publication Date: 2016-04-13
唐山凯昂实业有限公司
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Problems solved by technology
[0003] Steel materials will undergo continuous thermal expansion and cold contraction as the temperature changes, but when the sample undergoes a solid-state phase transition, discontinuous changes in volume often occur, resulting in discontinuous changes in thermal expansion
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[0015] In the test, the CCT curve of 65Mn steel was determined by dilatation method combined with metallographic-hardness method. First, the critical point Ar of 65Mn steel was measured on the Gleeble-3500 thermal simulator 1 、Ar 3 、Ac 1 、Ac 3 and M s , and then measure the expansion curve of 65Mn steel during continuous cooling at 12 different cooling rates. According to the inflection point or tangent point on different expansion curves, combined with the metallographic structure, the phase transition temperature can be determined, and finally the continuous cooling transition curve of 65Mn steel can be obtained . The chemical composition is shown in Table 1.
[0016] Table 165Mn test billet chemical composition (mass fraction, %)
[0017]
[0018] The cast slab smelted in the laboratory was forged to an intermediate slab with a thickness of 35 mm, and homogenized annealed. Then use a wire cutting machine to add a sample of Φ8mm×15mm on the intermediate blank.
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Abstract
A method for preventing a 65 Mn hot rolled steel coil from collapsing by phase-change thermal expansion belongs to physical metallurgy in the principle term, and is applicable to metallurgy production. Through air cooling, reeling, transporting, and cooling in packed formation after rolling of 65 Mn steel, accompanied by the precipitation of ferrolites and decomposition of an austenite into a pearlite, the expansion of the volume of a steel and iron material is caused. According to the invention, the rolled phase-change temperature is controlled after reeling, the head and the tail of a steel coil after the steel coil is unloaded are exposed in the air, the cooling speed is higher, the expansion of the volume, which results from the precipitation of the feerolites and the phase change of the austenite to the pearlite, is caused immediately, a tensioning force is generated among the steel coil layers to enable the elasticity of the whole steel coil layer to be enhanced, and no coil collapsing phenomenon is generated in the following transportation process. The method has the advantages that on the premise of ensuring the performance of the 65 Mn steel, the phase-change thermal expansion is used to prevent the hot rolled steel coil from collapsing in the transportation process after being reeled, and the method is simple and feasible in the aspects of optimizing the quality of the 65 Mn steel and improving the production efficiency, and low in cost.
Description
Technical field: [0001] A method for preventing the collapse of 65Mn hot-rolled coils by using phase change thermal expansion, the principle belongs to metallurgy, and is applied to metallurgical production. Background technique: [0002] At present, all kinds of saw blades produced in China are mainly made of 65Mn steel, and 65Mn is a relatively traditional saw blade material. With the large-scale and high-speed equipment of saw blades in various sawing machines, higher requirements are put forward for the mechanical properties of traditional saw blade material 65Mn steel. How to fundamentally reduce its toughness and wear resistance Improving the internal quality of saw blades, prolonging the service life, and making traditional materials glow with new brilliance are urgent problems for metal materials and material processing workers. [0003] Steel materials will undergo continuous thermal expansion and cold contraction with temperature changes, but when the sample under...
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IPC IPC(8): B21B1/22B21B37/74B21C47/02C22C38/42
Inventor 田亚强陈连生宋进英魏英立何立新杨子旋
Owner 唐山凯昂实业有限公司