<*n class="16" style="background:#FFFFFF;color:#000000;font-family:"";">1.2738HH<*n>模具钢<*n style="color:#000000;font-family:宋体;font-size:9pt;font-weight:bold;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">1.2738HH <*n>钢采用****的模具钢精炼技术<*n>, <*n>为真空熔炼的 <*n>Cr-Ni-Mo<*n>合金钢。<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Calibri;font-size:10.5pt;">中文名<*n style="color:#000000;font-family:Calibri;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Calibri;font-size:10.5pt;">1.2738HH<*n>模具钢 <*n style="color:#000000;font-family:Calibri;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Calibri;font-size:10.5pt;">化学成分<*n style="color:#000000;font-family:Calibri;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Calibri;font-size:10.5pt;">C0.37%<*n>、<*n>Cr2.00% <*n style="color:#000000;font-family:Calibri;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Calibri;font-size:10.5pt;">状<*n>    <*n>态<*n style="color:#000000;font-family:Calibri;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Calibri;font-size:10.5pt;">硬度 <*n>330~370HBW <*n style="color:#000000;font-family:Calibri;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Calibri;font-size:10.5pt;">性<*n>    <*n>能<*n style="color:#000000;font-family:Calibri;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Calibri;font-size:10.5pt;">温度<*n>20°C/200****00°C <*n style="color:#000000;font-family:Calibri;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:宋体;font-size:15.5pt;font-weight:bold;text-decoration:underline;">1.2738HH模具钢材料特性<*n style="color:#000000;font-family:Arial;font-size:9pt;font-weight:bold;text-decoration:underline;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">该钢具有优良的抛光性及光蚀刻花性能<*n>; <*n>优良的可加工性<*n>; <*n>*性能良好<*n>; <*n>大型模具硬度均匀<*n>, <*n>*致密<*n>; <*n>无淬裂及热处理变形风险<*n>, <*n>无需热处理<*n>, <*n>缩短模具制作周期<*n>; <*n>良好的表面氮化性能<*n>; <*n>可以进行表面火焰硬化处理<*n>, <*n>以增进模具表面硬度及*性。模具在淬火前<*n>, <*n>必须进行充分软化退火。淬火后应及时回火<*n>, <*n>缓慢加热。<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n><*n class="15" style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">1.2738HH<*n>模具钢 <*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">电加工后阶段的精放电加工<*n>, <*n>应以小电流、高频率进行<*n>, <*n>以免损伤模具。放电后模具表面应研磨去除<*n>“<*n>电火花白层<*n>”,<*n>在<*n>500℃<*n>再进行一次回火<*n>, <*n>以去除应力。<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">对回火后的模具进行磨削加工时<*n>, <*n>为了****产生磨削裂纹和表面软化<*n>, <*n>应该注意<*n>:<*n>充分冷却<*n>; <*n>磨削压力适当<*n>; <*n>加工工艺合理。<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">该钢为<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;font-weight:bold;">预硬塑胶模具钢<*n>,<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">具有良好的抛光性能<*n>, <*n>通常采用氧化铝或石膏抛光。首先是粗抛<*n>, <*n>然后用越来越细的磨料抛光<*n>, <*n>每换一次磨料抛光方向要改变<*n>, <*n>****终一道抛光时间不宜太长<*n>, <*n>否则会影响模具表面的粗糙度。<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">氮化可增加模具表面硬度<*n>, <*n>*****性及耐蚀性。该钢虽然已经过预硬化处理<*n>, <*n>但仍可以通过热处理再****硬度。<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:宋体;font-size:15.5pt;font-weight:bold;text-decoration:underline;">1.2738HH模具钢供货状态<*n style="color:#000000;font-family:Arial;font-size:9pt;font-weight:bold;text-decoration:underline;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">预硬态<*n>, <*n>硬度 <*n>330~370HBW, <*n>淬火、回火态<*n>, <*n>硬度 <*n>35~39HRC<*n>。<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:宋体;font-size:15.5pt;font-weight:bold;text-decoration:underline;">1.2738HH模具钢化学成分<*n style="color:#000000;font-family:Arial;font-size:9pt;font-weight:bold;text-decoration:underline;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">该钢典型化学成分 <*n>(<*n>质量分数<*n>) <*n>举例<*n>:C0.37%<*n>、<*n>Cr2.00%<*n>、<*n>Mn1.40%<*n>、<*n>Si0.30%<*n>、<*n>Mo0.20%<*n>、<*n>Ni1.00% <*n>。<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:宋体;font-size:15.5pt;font-weight:bold;text-decoration:underline;">1.2738HH模具钢参考牌号<*n style="color:#000000;font-family:Arial;font-size:9pt;font-weight:bold;text-decoration:underline;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">中国 <*n>GB <*n>标准牌号 <*n>3cr2NiMo<*n>、德国 <*n>DIN <*n>标准牌号 <*n>40CrMnNiMo8 6 4<*n>、德国 <*n>DIN <*n>标准材料编号 <*n>1.2738<*n>、美国 <*n>AISI<*n>标准牌号 <*n>P20 +Ni<*n>、日本<*n>JIS <*n>标准牌号 <*n>PDS5S<*n>、美国 <*n>AISI<*n>标准 <*n>P2U MODIFIED <*n>牌号、瑞典 <*n>UDDEHOLM <*n>标准牌号<*n>IMPAX HI HARD<*n>、瑞典一胜百<*n>(ASSAB) <*n>标准牌号<*n>718 (HH)<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:宋体;font-size:15.5pt;font-weight:bold;text-decoration:underline;">1.2738HH模具钢材料性能<*n style="color:#000000;font-family:Arial;font-size:9pt;font-weight:bold;text-decoration:underline;">

<*n style="background:#FFFFFF;color:#000000;font-family:宋体;font-size:12pt;font-weight:bold;">1.2738HH模具钢物理性能<*n style="color:#000000;font-family:宋体;font-size:12pt;font-weight:bold;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">(<*n>试样硬度 <*n>340HBW, <*n>在室温及高温条件下<*n>)<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">1) <*n>温度 <*n>20°C/200****00°C, <*n>密度 <*n>7. 8g/cm/7.75g/cm/7. 7g/cm<*n>。<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">2) <*n>温度 <*n>20~200°C/20 ~400°C, <*n>线胀系数<*n>: 12.6 ×10K/13.5×10K<*n>。<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">3) <*n>温度<*n>20°C/200****00°C,<*n>热导率<*n>29.0W·(m·K)/29.5W·(m·K)/31.0W·(m·K)<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">4) <*n>温度 <*n>20°C/200****00°C, <*n>弹性模量<*n>:205000MPa/200000MPa/185000MPa<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:宋体;font-size:12pt;font-weight:bold;">1.2738HH模具钢力学性能<*n style="color:#000000;font-family:宋体;font-size:12pt;font-weight:bold;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">(<*n>试样硬度 <*n>340HBW)<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">1) <*n>温度 <*n>20°C/200****00°C, <*n>*拉强度<*n>1100MPa/1050MP8/850MPa<*n>。<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">2) <*n>温度 <*n>20°C/200****00°C, <*n>条件屈服强度<*n>980MPa/925MPa/770MPa<*n>。<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">3) <*n>温度 <*n>20°C/200****00°C, <*n>断面收缩率<*n>49%/51%/52%<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">4) <*n>温度 <*n>20°C/200****00°C, <*n>伸长率 <*n>13%/14%/16%<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">5) <*n>温度<*n>20°C/200****00°C,<*n>冲击韧度 <*n>(≥) 20J/cm/32J/cm/42J/cm<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:宋体;font-size:15.5pt;font-weight:bold;text-decoration:underline;">1.2738HH模具钢工艺规范<*n style="color:#000000;font-family:Arial;font-size:9pt;font-weight:bold;text-decoration:underline;">

<*n style="background:#FFFFFF;color:#000000;font-family:宋体;font-size:12pt;font-weight:bold;">1.2738HH模具钢软化退火<*n style="color:#000000;font-family:宋体;font-size:12pt;font-weight:bold;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">退火温度<*n>710~740°C, <*n>保温时间按每 <*n>25mm <*n>壁厚<*n>1h<*n>确定<*n>. <*n>保温后随炉冷却。<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:宋体;font-size:12pt;font-weight:bold;">1.2738HH模具钢去应力处理<*n style="color:#000000;font-family:宋体;font-size:12pt;font-weight:bold;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">加热温度 <*n>600°C (<*n>退火状态<*n>), 550°C (<*n>淬火、回火状态<*n>), <*n>保温时间按每 <*n>50mm<*n>壁厚<*n>1h <*n>确定<*n>, <*n>保温后随炉冷却。<*n style="color:#000000;font-family:Arial;font-size:10.5pt;">

<*n style="background:#FFFFFF;color:#000000;font-family:Arial;font-size:10.5pt;">[title2]<*n>淬火<*n style="color:#000000;font-family:Calibri;font-size:10.5pt;">