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梁赞农业机械制造厂在生产牌号为33-8的冲天炉可锻铸铁时,对于化学成分为碳2.8～3.1%,锰0.4～0.6%,硅0.7～1.1%,硫〈0.18%,磷〈0.20%及铬〈0.06%的铸铁进行了复合变质的研究,通过试验室及车间的试验和实践以后证明:在85公斤的烧包中,当温度为1400～1420℃时,加入由2.6克金属铋、17.5克硼酸及12克铝所组成的并经过充分干燥的混合物以进行复合变质是卓有成效的。从1961
Ryanzan Agricultural Machinery Factory in the production of grade 33-8 cupola malleable iron, the chemical composition of 2.8 to 3.1% of carbon, manganese 0.4 to 0.6%, 0.7 to 1.1% of silicon, sulfur <0.18%, phosphorus <0.20% And chromium <0.06% of the cast iron compound metamorphism research, laboratory and workshop through the test and practice proved later: in the 85 kg of the package, when the temperature is 1400 ~ 1420 ℃, by adding 2.6 grams of metal bismuth, 17.5 It is effective to make a mixture that consists of 15 grams of boric acid and 12 grams of aluminum and is thoroughly dried to effect composite metamorphism. From 1961