Hot Rolled Stainless Steel Strip Classification of metal materials
Hot-rolled stainless steel belt type and grinding advantages
In the classification of metal materials, people often in accordance with the different characteristics of the hot-rolled stainless steel strip is divided into five categories, namely: martensitic hot-rolled stainless steel, ferritic hot-rolled stainless steel, austenitic hot-rolled stainless steel , Austenitic ferrite multiphase hot rolled stainless steel strip, precipitation hardened hot rolled stainless steel strip. One of the most common when the number of austenitic hot-rolled stainless steel belt, about to account for about 70% of the total amount of hot-rolled stainless steel.
The addition of different elements will directly affect the microstructure of hot rolled stainless steel strip, such as ferrite forming elements: Cr, Mo, Si, Ti, Nb; austenite forming elements: C, N, Ni, Mn, Cu and so on. The content of Cr in the hot rolled stainless steel strip has a crucial effect on the corrosion resistance and oxidation of the hot rolled stainless steel strip.
At present, hot-rolled stainless steel strip at the same time to join Cr, Ni elements to account for the total output of hot-rolled stainless steel with more than 60%. Compared with structural steel, hot-rolled stainless steel with poor thermal conductivity, low elastic modulus, elongation, and cross-section shrinkage is also large, to the processing, especially grinding a lot of difficulties.
Grinding is a significant feature is easy to occur grinding adhesion, blocking abrasive, affecting the grinding efficiency and grinding quality, and even lead to hot-rolled stainless steel processing and abrasive of the lose-lose.
Grinding Hot Rolled Stainless Steel Belt Features:
1. Hot-rolled stainless steel with high toughness, high thermal strength, and grinding wheel abrasive cutting edge has a larger negative rake angle, grinding process is not easy to cut off the debris, cutting resistance, squeeze, friction The The grinding force per unit area is very large, the grinding temperature can reach 1000 ℃ ~ 1500 ℃. At the same time, under the action of high temperature and high pressure, the abrasive is easy to adhere to the grinding wheel, filling the gap of the abrasive grain, so that the abrasive particles lose the cutting effect. Hot-rolled stainless steel belt of different types, resulting in grinding wheel is not the same situation, such as grinding thick nitric acid hot-rolled stainless steel and hot-rolled hot-rolled stainless steel belt, adhesion, blocking phenomenon than 1Cr18NiTi serious, and 1Cr13, Hot-rolled stainless steel strip is relatively light.
2. Hot-rolled stainless steel with a small thermal conductivity, grinding high temperature is not easy to export, the workpiece surface easy to produce burns, annealing and other phenomena, the depth of the annealing layer sometimes up to 0.01 ~ 0.02 mm. Grinding process, resulting in serious extrusion deformation, resulting in grinding surface hardening, especially grinding austenitic hot-rolled stainless steel belt, the austenite is not stable enough, easy to produce martensite after grinding, so that Surface hardening serious.
3. Hot-rolled stainless steel with a large linear expansion coefficient, the role of grinding in the deformation under the easy, its size is difficult to control. Especially thin-walled and slender parts, this phenomenon is more serious.
4. Most types of hot-rolled stainless steel strip can not be magnetized, in the plane grinding, can only rely on mechanical clamping or special fixture to clamp the workpiece, the use of the workpiece side clamping the workpiece, resulting in deformation and shape or size error, The workpiece is more prominent. But also cause the flutter in the grinding process and appear ugly corrugated.