在精密铸造生产过程中,由于工艺上的需要,焙烧砂箱须在高温下反复使用。每使用一次,要经900℃焙烧4小时,加上加热和冷却时间长达10个时。因此要求砂箱具有良好的耐热性、耐蚀性和耐急冷急热等性能。我厂对有关砂箱材料已作了许多尝试。曾使用过低碳钢砂箱、耐热铸铁砂箱并长期以来使用不锈钢砂箱。低碳钢砂箱抗氧化性能差,每使用一次单边脱落0.5毫米氧化铁皮;因此使用寿命低,实 In the precision casting production process, due to technological needs, roasting flask to be repeatedly used at high temperatures. Each use, to be calcined at 900 ℃ for 4 hours, with heating and cooling time up to 10 hours. Therefore, the sand box is required to have good heat resistance, corrosion resistance and high temperature resistance. I plant on the box material has made many attempts. Has used low-carbon steel sand box, heat-resistant cast iron sand box and long-term use of stainless steel sand box. Low-carbon steel sand box poor oxidation resistance, each used once unilateral 0.5 mm iron oxide off; so low life expectancy