The major changes and supplements have been made to the technical contents in this revised version over DL/T
　　680-1999 Speccification for Wear-resistant Pipes in the following aspects：
　　-The title of the standard has been changed from Specification for Wear-resistant Pipes into
　　Specfication for Electric Power Industry Wear-resistant Pipes.
　　-The chemical compositions of some grades have been modified.
　　-The designation of abrasion-resistant white cast iron has been modified.
　　-The property parameters of some grades have been modified and adjusted.
　　-The nominal diameter ranges of some circular wear-resistant pipes have been adjusted.
　　-The designation of some wear-resistant pipes has been adjusted.
　　-The abrasion-resistant white cast iron mono-metal pipe (KmTBCr2G) and abrasion-resistant white cast iron bimetal composite wear-resistant pipe (KmTBCr2-G) in the former standard have been removed.
　　-Some terms related to the wear resi resistant pipes have been added.
　　-The abrasion-resistant white _cast iron wear-resistant pipes (BTMCr8G， BTMCr12G， BTMCr30G)
　　and abrasion-resistant white cast iron bimetal composite wear-resistant pipes (BTMCr8-G，BTMCr12-G， BTMCr30-G) have been added.
　　-The alloy steel composite wear-resistant pipes with hardened inner walls / pipes (NY45CrMnSi-G，
　　NY55CrMnSi-G， NY65CrMnSi-G) have been added.
　　-The surfacing composite wear-resistant pipes (DNM-IV-G， DNM- V -G) have been added.
　　-The ceramic composite wear-resistant pipes prepared by sleeving and casting methods (TCT-G， TCZ-G) have been added.
　　-The silicon carbide composite wear-resistant pipe combined with oxides (YSiC-G) and recrystallized silicon carbide composite wear-resistant pipe (RSiC-G) have been added.
　　This standard was proposed by China Electricity Council.
　　This standard is under jurisdiction of Standardization Technology Committee of Power Plant Metallic Materials in Electric Power Industry.
　　The chief drafting organizations of this standard include North China Electric Power University， Huadian Electric Power Research Institute， and Huludao Huaneng Industrial Ceramic Co.， Ltd..
　　The organizations participating in the drafting of this standard include Nantong Gaoxin Antiwear Technology Co.， Ltd.， Jiangsu Huanai Lining Material Co.， Ltd.， Penglai Shuicheng Cast Basalt Pipes & Valves Co.， Ltd.， Chongqing Yuji Machinery Manufacturing Co.， Ltd.， Hebei Jiutong Wear and Corrosion
　　Resistant Pipeline Co.， Ltd.， Anshan Taiyuan Industrial Co.， Ltd.， Chongqing Luoman Wear Resistant New Materials Co.， Ltd.， Zhengzhou Huatai Energy Saving Ceramic Co.， Ltd.， Xuzhou Zhongcai Tianyuan Heavy Machinery Co.， Ltd.， Tianjin Fuyide Electromechanical Equipment Co.， Ltd.， Inner Mongolia Keyun
　　Environmental Protection Material Co.， Ltd.， Tianjin Tedian Metal Products Co.， Ltd.， Hebei Jingliang Power Equipment Co.， Ltd.， Beijing Jiake Xinxing Technology Co.， Ltd.， Cangzhou Boyang Pipeline Group Co.， Ltd.，Shang'an Power Plant of Huaneng Power International， Inc.， Xi'an Thermal Power Research Institute Co.， Ltd.，National Experiment and Research Center for Wear Resistant Material of Power Industry， Hangzhou Huadian Banshan Power Generation Co.， Ltd.， National Quality Supervision， Inspection and Testing Center for Metal Wear Resistant Parts of Power Industry， Harbin First Thermal Power Plant of Datang Heilongjiang Power Generation Co.， Ltd.， and Beijing Kangshenghongda Technology Co.，Ltd..The primary drafters of this standard are XinlinWen， Guiji Tang， Yanjun Guo， Jianmin Jia， Haiyuan Chen，Yueliang Sun， Xiumei Wang， Bing Qian， Guozhi Wang， Minhui Zhang， Hui Xu， Yuanquan Mou， Zhenhai Wang，Jinliang Liu， Yu Sun， Weidong Zhao， Xuefeng Zhang， Qingfu Liu， Maosong Liu， Wanchun Feng， Qingfu Kong，Pingge Wang， Zhenguo Xing， Guosheng Ji， Yupeng Zheng， Zhengfang Zhu， Liqiang An， Haimin Ding，Zhenying Liu， Xiujiang Wang and Yizhong Kang.