toby wrote:I was looking for an answer to a question on 2nd class EK.
Question: Describe the tests used and the readings you would expect to find on the steel used in the construction of a tail shaft.
Tensile strength for main propulsion shafting:
in alloy steels not exceeding 800M/mm2
Carbon and carbon manganese steel 400-600 N/mm2
Where it is proposed to use alloy steel, details of chemical composition and mechanical properties are to be submitted for approval.
When forging exceeds both 4 tonnes and 3 m in length a tensile test is to be taken from each end.
Batch testing can be used for bars not exceeding 250 mm in diameter, which are machined for shafts.
Tensile Charpy V-notch test (icebreaker shafts) Tests to be carried out at -10C and average energy value no less then 27J
Magnetic particle or dye penetrate- Tested where experience shows defects most likely to occur.
Ultrasonic testing is to be carried out on shaft with finished diameter of 250 mm and over-meet Surveyors satisfaction
Do you need Chemical composition for this question?