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世界铸铁产量统计表明,虽然球墨铸铁应用范围不断扩大,使灰铸铁产量占铸铁件总产量的比重由1979年的84％降低到1982年的78.5％,但它仍占相当大的比重。几个工业发达的国家,如美国、日本、西德的球铁产量都较高,但灰铸铁件产量仍分别占铸铁件总产量的74.7％、65％和76.7％。在灰铸铁产量中,随着对铸铁件质量要求的提高,高强度灰铸铁所占的比重愈来愈大。以两德1982年的铸铁生产为例,GG15(相当于我国HT15—33)只占全部铸铁件的32％,而GG20至GG35的总和却占45％以上。又如目前国外柴油机缸体、缸盖的材料
According to statistics of the world’s cast iron production, although the scope of application of ductile iron has been expanding, the proportion of gray cast iron output to the total output of cast iron products has dropped from 84% in 1979 to 78.5% in 1982, but it still accounts for a large proportion. In some developed countries such as the United States, Japan and West Germany, the ductile iron production is high, but the output of gray cast iron still accounts for 74.7%, 65% and 76.7% of the total output of the cast iron respectively. In the gray cast iron production, with the quality requirements of the cast iron improve, the proportion of high-strength gray cast iron is getting bigger and bigger. Taking the production of cast iron in Germany and Germany in 1982 as an example, GG15 (equivalent to China’s HT15-33) only accounts for 32% of the total iron castings, while the sum of GG20 to GG35 accounts for more than 45%. Another example is the current foreign diesel engine cylinder head material