Listen to jiaxing bearing small make up to 45 steel heat treatment

There is rotational, have HRB bearing ( ) Against 45 steel heat treatment, we invite our jiaxing bearing engineer today for everyone to do a detailed introduction and guidance, hope everyone can learn. Jiaxing bearing group sales co. , LTD. ( The company) Is bearing group co. , LTD. Established in jiaxing spot sales window, specializing in HRB brand bearings, facing the whole country, the existing stock 50 million yuan, covers the whole bearing, have very strong spot supply, is the group's retail sales center. Conditioning is that there is a range of hardness, generally between 225297 hb. If it is 45 # steel conditioning treatment, namely high temperature quenching + tempering, highest hardness should be 297 hb, namely 31 ~ 32 HRC! ! ! ! This is the most ideal state. The general may not reach the value. Quenching of 45 steel, if the water quenching can reach 40 - general - - - 60 hrc ( According to the size of the water temperature and material) And oil quenching in 30 - commonly - - - (between 55 HRC According to the thickness of the material size and type of quenching oil) 。 Cracks in the process of heat treatment not crack has nothing to do with what is hardness, and the shape of the workpiece and the heat treatment, etc. Normalizing commonly used in low carbon steel. Pearlitic structure after normalizing, ease of machining. High carbon steel, alloy steel, using the annealing ( Common, spheroidizing, isothermal. ） Conditioning is the double heat treatment of quenching and high temperature tempering, its purpose is to make the workpiece with good comprehensive mechanical properties. Quenched and tempered steel with carbon quenched and tempered steel and alloy quenched and tempered steel two kinds big, either carbon steel or alloy steel, carbon content control more strictly. If carbon content is too high, the strength of the workpiece after tempering is high, but the toughness is not enough, such as the carbon content is too low, toughness and strength is insufficient. For the conditioning get good comprehensive performance, general control the carbon content in the 0. 30 ~ 0. 50%. Conditioning hardening, the requirements, the entire section workpiece hardening, the artifacts are mainly fine needle quenching martensite microstructure. Is obtained by high temperature tempering, give priority to with evenly tempered sorbite of microstructure. Every batch small factory can not make metallographic analysis, hardness test only commonly, that is to say, the hardness after quenching must achieve the quenching hardness of the material, after tempering hardness to check according to the requirements of figure. Artifacts of modified treatment weeken the operation, must be strictly according to the execution process document, we are just some Suggestions on how to implement process in the process of operation. 1, 45 steel quenched and tempered 45 steel is medium carbon structural steel, hot and cold processing performance is good, better mechanical properties, and low price, wide source, so widely used. It is the biggest weakness of low hardenability, section size and require higher artifacts should not be used. 45 steel quenching temperature on A3 + ( 30 ~ 50) ℃, in practice, usually take limit. High heating speed, quenching temperature can make the workpiece surface oxidation reduction, and can improve working efficiency. To make the workpiece austenitic homogenization, you need enough time of heat preservation. If the actual furnace charging quantity, it should be appropriately extended holding time. Otherwise, there might be caused by uneven heating of hardness insufficient phenomenon. But the heat preservation time is too long, will also appear coarse grains, oxidation decarbonization serious ills, affect the quenching quality. We believe that such as furnace charging quantity is greater than the terms of the process documents, 1/5 heating heat preservation time should be extended. Because the hardenability of 45 steel is low, so the cooling speed of 10% saline solution should be adopted. Artifacts into the water, should be hardening, but not cold, if the artifact in brine is cold, it is possible to make the workpiece craze, this is because when the workpiece when cooled to about 180 ℃, austenite into martensite rapidly cause too much stress caused by the organization. Therefore, when the temperature of the quenching workpiece fast cooling to the area, should take the slow cooling method. Because of the water temperature is difficult to grasp, experience in operation, when the workpiece shaking stops in the water, then air cooling water ( Such as better oil cooling) 。 In addition, the workpiece into the water should move should not be static, should according to the workpiece geometry, as a rule. The stillness of the cooling medium and the stillness of the workpiece, resulting in uneven hardness, the uneven stress and make the workpiece deformation is large, and even cracking. If you are looking for jiaxing bearing group engineer introduced above 45 steel heat treatment are interested or have any questions, please click on the website on the right side of the online customer service or call:, you close the way of jiaxing bearing purchasing advisors. - - - - - - Editor: jiaxing bearing sourcing consultant LTD. All rights reserved, The company) Reprint please indicate the source