concrete pump pipe high wear-resisting, inner-harden, long service life, high security, highly pressurized,widely used concrete pump pipepipe line( ... wear-resistant seamless or welded tube)material:45Mn2,high quality alloy steel pipe,st52, ... 2000/1000148mm chrom carbide insertSchwing,Putzmeister,CIFA,Kyokuto,SanyZX-pipe(ST52)Harden ZX-pipe1257.03000/2000/1000ZX-5’’ F ...