?????????8????Q345qD?????????????

Q345qD??????????????????
X80????????С???????80000psi??552MPa????
PSI???????Pounds per square inch??P???pound??S?????square??I?????inch???????е??λ????????λ??????????1bar??14.5psi
1psi=6.895kPa=0.06895bar ??????????????psi????λ
X80???????????????????????
??????????????????????????????????????????295??360 MPa??????API?????X42??X52????????????526??703 MPa??????X80??X100???????????????????????????????????1??1?????????????????????????е?????????????????????????????????????????????????????????в?????????????????????????????????????????????????α??????????????????????????????????????????????????????????????????????????????淶?ж???????????????????????????????????????????????0.90??

????Q345qD???????????

??????????????????????????????г??????????????????????????????;????????????????
?г????????????????г??????????????????????????????????????????????????????
????????????????????????????????????????????????????????????????????????????
??????????????????????

Q345qD??????????????????
5??1800??8000+ 32??
5??1800??8000+ 32??
8??1800??8000+ 90??
8??2000??8000+ 70??
10??1800??8000+ 70??
10??2000??8000+ 90??

???????????????лл   ?? ?????  ?????Q345qD???????????
?????????8????Q345qD?????????????????