???????21mm??????????????????

??????????????????????
14??2000??8000+ 70??
8??2000??8000+ 21??
8??2000??8000+ 70??
8??2000??8000+ 32??
8??2000??8000+ 70??
10??2000??8000+ 21??
10??2000??8000+ 70??

??????????????????????

?????????;???????????????????????????????????????????????????????????????м????????????????????????????????????????????????е???????????????????????????????????5%?????????????????5-10%??????к????????10%??????????????????????????19?????1870??????????0.64??0.9%???????0.54??0.68%?????????685Mpa?????????410Mpa????α?????????????????????158.5m???????????

???????????????????????
2013????????й????????Э??86?????????????????????0.13%????39?????????е????????40.7%?????????????д????????????????????????????1000????????????????????????????????????г?????????????????????????????????????????????????????????????????????????????г????????????????????????????????????á???δ????????????????г??????????г???????????????????г??????????????????????????????????и????

???????????????лл   ?? ?????  ????????????????????

???????21mm????????????????????????