所属分类：行业资讯 发布时间：2021-04-09 12:00:06 来源：http://www.lcnmb500.com 浏览量：
The remarkable feature of the mechanical properties of the precipitation strengthened wear-resistant plate is that the yield strength has been greatly improved. For example, the yield strength of the wear-resistant plate after precipitation strengthening treatment reaches 480-8l0mpa, and the yield strength ratio is 0.55-0.56; the yield strength ratio of the wear-resistant plate after dispersion strengthening is 0.60-0.65.
At the same time, the hardness and impact toughness of the precipitation strengthened wear-resistant plate are also improved. For example, the hardness of wear-resistant plate after precipitation strengthening is 230-300 HBW, and the impact toughness is 140-180. More importantly, the increase of the above indexes does not lead to a significant decrease in plasticity.
After water quenching at 1100 ℃, the wear-resistant plate was first kept at different temperatures in the middle temperature region, and then quenched at 970 ℃. With the increase of holding temperature and holding time in medium temperature zone, the amount of carbides in the steel increases, the precipitation strengthening effect increases, and the hardness increases.
The thermal conductivity of hardox450 wear-resistant plate is only 1 / 2 of that of carbon steel, and even at 900-1000 ℃, the thermal conductivity of hardox450 wear-resistant plate is lower than that of carbon steel at the same temperature. Therefore, the heating rate of wear-resistant plate, especially in the low temperature stage, should be lower than that of carbon steel, so as to avoid cracks caused by too steep temperature gradient in the casting.
The heating rate of castings with wall thickness of 40-80mm below 700 ℃ shall not exceed 100 ℃ / h; castings with wall thickness of 80-120mm shall not exceed 75 ℃ / h; castings with wall thickness of more than 120mm shall be less than 50 ℃ / h. When the temperature is above 700 ℃, the temperature of castings with wall thickness less than 100 mm can be raised with the furnace, while the heating rate of castings with wall thickness more than 100 mm can not exceed 100 ℃ / h.