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1979年,我国铁路更换新轨2507公里,使正线50公斤型钢轨比重占41%,正线平均钢轨重量达46.6公斤/米。自1954年我国钢铁企业生产钢轨以来,逐步统一了正线钢轨标准。钢轨最重为60公斤型,次为50公斤型,再次为43公斤型。钢轨材质有碳素钢、中锰钢及高硅钢三种。道岔定型为9号、12号及18号,结构为拼装普通辙叉、高锰钢整铸辙叉、普通曲线尖轨及特种断面尖轨。 1979年铺设无缝线路638公里。我国铁路自1957年起铺设无缝线路,累计铺设
In 1979, China’s railways replaced 2507 kilometers of new tracks, bringing the proportion of 50-kilogram rails on the main line to 41% and the average on-track rail weight of 46.6 kilograms / meter. Since 1954 China’s steel production rail, has gradually unified the standard rail standard. The heaviest rail is 60 kilos, followed by 50 kilos, again 43 kilos. Rail material is carbon steel, manganese steel and high silicon steel three. Turnout stereotypes No. 9, No. 12 and No. 18, the structure for the assembly common frog, high manganese steel cast frog, ordinary curved sharp rail and special section of the sharp rail. In 1979 laid a seamless line 638 kilometers. China’s railways have laid a seamless line since 1957 and have been laying their own buildings