R Sri Siva、M Shumuga Priyan*
????????? EN-31 ???????????????????????????? EN 31 ?????????????????????????????????? CHT ? DCT ???????????? CHT ? DCT ??????? ASTM E3-01 ???????????????????????????????????????????????????????????????????????????????????????????? DCT ?????? CHT ??????????????????????861 HV??CHT???19.20%?847 HV??CHT???17.25%?838 HV??CHT???17.10%?857 HV??CHT???18.40%?790 HV??CHT???????13.45%?
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