海上集裝箱生產建造檢驗-材料學習

1、學習：DNV 2.7-1 材料Charpy impact requirements for steels for primary structures;Requirements for impact energy depend on the specified minimum yield stress of the steel. The average energy absorption for 3 base material specimens with their axis parallel to the final rolling direction shall not be less

2、than given in Figure 3-1. For base material specimens with their axis transverse to the final rolling direction the requirement is 2/3 of that for longitudinally oriented specimens. No single value shall be less than 70% of the required average values. If standardspecimens cannot be made, the requir

3、ed energy values are reduced as follows: 10 x 7.5 mm 5/6 of above values 10 x 5.0 mm 2/3 of above values For steel members with thickness less than 6 mm, impact testing is not required. Austenitic steels need not be impact tested.QUIZ: GB/T 1591-2008低合金高強度結構鋼1.What grade of 25mm thickness GB/T Q345

4、plate shall be used for TD= -20oC and what is the required impact energy in Joules?2.What grade of 35mm thickness GB/T Q345 plate shall be used for TD= -20oC and what is the required impact energy in Joules?3.What grade of 25mm thickness GB/T Q390 plate shall be used for TD= -20oC and what is the re

5、quired impact energy in Joules?4.What grade of 45mm thickness GB/T Q390 plate shall be used for TD= -20oC and what is the required impact energy in Joules?Answers;o1.25mm GB/T 1591-08 Q345D: R m = 335 MPA, -20C, 34J will be adequate.35mm GB/T 1591-08 Q345E: R m = 335 MPA, -40 oC, 34J will be adequat

6、e.3.25mm GB/T 1591-08 Q390D: Rm = 370 MPA, -20oC, 34J will may not be adequate. The specified minimum impact energy shall be = 37J. Mill cert shallbe reviewed for compliances.oC, 34J will may not be adequate. The specified minimum impact energy shall be = 35J. Mill cert shall4.45mm GB/T 1591-08 Q390

7、E: Rm = 350 MPA, -40be reviewed for compliances.善待自己，學會放棄，得而不喜，失而不煩，棄而不悔，多一份執(zhí)著和自信，添一份灑脫和從容，才是瀟灑快樂的人生！善待自己，學會原諒。誰都會遇到不順心的事，誰都會碰到不順眼的人。如果你不學會原諒，就會活得痛苦，活得很累。既要學會原諒自己，又要學會原諒別人，還要學會原諒生活。原諒自己，并不意味著對自己的放縱；原諒別人，并不代表著丟棄原則，原諒生活，并不是不熱愛生活。學會原諒一切，只是為了善待別人和善待自己，也是為了善待一切。生命，每個人只有一次，或長或短；生活，每個人都在繼續(xù)，或悲或歡；人生，每個人都在旅途，或起或伏。人無完人，事無完美，有些小人，你不須計較，計較會煩；有些繁事，你不必在意，在意會累。假如你與所有不喜歡的人過不去，假如你與所有不順心的事都