我厂生产的套筒滚子链原采用20~＃或20c_r钢渗碳淬火,低温回火。技术要求是:表面硬度HR_A72-78,渗层深度0.7-0.9毫米。工艺曲线(如图1)按此工艺生产的链条滚子件,经十多年的生产应用考验,使用寿命在1500-2500小时。失效的方式如(图2)(?)(?)(?)(?)(?)(?)(?)(?)大学,吉林工业大学共同对滚子失效研究分析认为:滚子受链轮主要是由于多冲疲劳而失效。应充分地提高滚子强韧性,使之具有高的多冲疲劳寿命。所以决定将原20~＃渗碳淬火回火工艺改为用低碳合金钢淬火成低碳马氏体。低碳马氏体具有相当高的强度,(屈服强度达100-130kg/mm~2抗拉强度达120- I produced the sleeve roller chain used 20 ~ # or 20c_r steel carburizing quenching, tempering at low temperature. Technical requirements are: surface hardness HR_A72-78, infiltrated depth of 0.7-0.9 mm. Process curve (Figure 1) According to this process chain roller production parts, after more than 10 years of production and application of test life of 1500-2500 hours. University of Jilin, Jilin University of common research on the failure of the roller that: the roller by the chain (Figure 2) (?) (?) The wheel is mainly due to multiple red and fatigue failure. Should be fully improve the toughness of the roller, so that it has a high multi-red fatigue life. So I decided to change the original 20 ~ # carburizing quenching and tempering process into low-carbon alloy steel quenched into low-carbon martensite. Low-carbon martensite has a very high strength (yield strength of 100-130kg / mm ~ 2 tensile strength of 120-