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铸铁作为一种重要工程结构材料,广泛用于国民经济各部门,一般占铸件总产量的15%以上。在铸铁总产量中,灰铸铁又占15%以上。由于市场竞争激烈,对铸铁件要求质量高、重量轻,因而在灰铸铁生产中,高强度灰铸铁得到了很大发展。以西德1982年的铸铁生产为例,灰铸铁件中,GG20以上牌号大于58.4%。目前国外柴油机缸体、缸盖所用牌号相当于HT 25-47美国约翰逊公司生产的160马力拖拉机后桥部分有50余种灰铸铁件,其中50%为HT25-47。七十年代中期,
As an important engineering structural material, cast iron is widely used in all sectors of the national economy and generally accounts for more than 15% of the total output of castings. In the total output of cast iron, gray cast iron accounts for more than 15%. Due to the highly competitive market, high quality and light weight castings are required. As a result, high-strength gray cast iron has been greatly developed in the production of gray cast iron. Take the production of cast iron in West Germany in 1982 as an example. In gray iron castings, the grade above GG20 is greater than 58.4%. At present, foreign diesel engine cylinder block and cylinder head are equivalent to HT 25-47. The 160 horsepower tractor manufactured by Johnson of USA has over 50 kinds of gray cast iron parts in the rear axle, of which 50% is HT25-47. The mid-seventies,