51吃瓜

HSn70-1 ????? ???? ??? ? ????-??? ???? ??? ??? ????? ????? ????? ?????? ???? contend trace amounts of arsenic, ?????????? ??? arsenic added brass in the Chinese national standard (GB5232-85).

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

????? ???????? ??? ????????????? ??????? ?????-??????? ??????????? ??? ??? ???????? ?? ??????????? ??????? ??? ???????. HSn70-1 ???? ???? ????????? ????????????,

?????? ????? ???? ?????Exchangers ??? ??????? ???? ????? ??? ????????? ??? ??????????? liquids, ??? ????? ????? ???? ??? ?????????? ??rm??? ????????????? ?? ????? ????-???????? ??? ???????????????? ?????Exchanger ???????????????? ??? ????? ????, ??? ?ρ???? ??????? ??? ???????? ????? ?????? ??? ?????, ????? ??? ?????? ???????? ?? HSn70-1 ????? ????? ????? ???????? ?? ?????????? ??????? ??? ??? ??????. HSn70-1 ???? ?? ???????? ????? ?????? ?????????? ????????, ??? ?????? ??????? ??????? ???????????????? ??? ?????? ????? ????? ?????? ???????. HSn70-1 ??? ???????? ?? ????????? ???? ????? ?????, ??? ??? ???????? ??? ?????????? ???? ???? ??????????? ?????????????.

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

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

??? (Pb) 0.05,

??? (??) 0.10,

??????????? (Sb) 0.005,

??????? (P) 0.01,

??????? (??) 0.002,

Tin (Sn) 0.8-1.3,

Arsenic (???) 0.03-0.06,

??????? (???) 69.0-71.0,

Total impurities %0.3

HSn70-1 ????????? ??????? ???????? ????????? ??????????? 1 ???????? ?????????? ??? ???? ??????????????? ??? ????????????, ?????, ??? ??? ?????????? ???? ???? ?????????? ????????????????? ??? ???????????bility ????? ?? ?????? ??? ???? ??????, ??? ??????? ?????? ??? ????? ??? ???? ??????, ??? ?? ??????? ?? ???? ??? ??????????? ??? ??rupture. HSn70-1 ?????????? ??alloy ????? ????? ?????? ????? ???????????-???? ?????? ???? ???? (??? ?????????-???????), ????????? ??? ????????? ??? ?

2.1 ??рм?????? ???????????? ????? ???????????????????: 899-938 °C ?????????? ??????????: λ=91.3W/(?·%%). ???????? ?????? ?????????????? ???????????: α=19.710-6 °C -1 (20 °C). 000

??????? 2.3 ?????????????? ??????????????: g=25% ????CS. ??????????? ???????????: p=0.069 μ Ω·?.

3. ?????????????? ???????? 3.1 ????? ??????????????????????????????? HSn70-1 ??? ?????? ?? ????-???? ????????????? ???????????? ??? ??iva???????? ??? ????? ????????, ?? ??? ???? ?????? (?+Y) ???????????, ????? ??? normally be eliminated by heating and annealing. 4 ???????? ?????????????? ??? ???????????????? ?????????????? ?? ?????????????????? ????? ?????????????? ??? 650-750 °C ??? HSn70-1 ????????? ??? ???? ???????? ?????????????, ??? ????? ?? ??????? ??? ?????, ??? ??? ???? ????????? ????? ?????? ???????? ??? ???? ??????? ark? ????????, ????? ??? ????????? ????? ????????? ????? ???????? ??? ??