Examination

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					Examination


  Materials
    Fill the following blanks
• 1.The useful impurity elements in carbon
  steel are (     ), the harmful elements are
  (      ).
• 2.The common heat treatments of steel
  are (     ),(       ), (     ).
• 3.The pressure vessels are classified as
  (    )( )(     )(     )(     )according to
  the grades of pressure.
4.For iron based steel ,the yielding stressσs
  is getting (       ), and the elastic modulus
  E is getting (       ) when the temperature
  is becoming higher.
5. The value of Poison’s ratio of steel () is
  (        ).
6. The mechanical properties of metal
  materials are (           ) ,(     ), (     ) and
  (       ).
7Usual failure forms are respectively
  (        ) for an internal pressure
  vessel,(         ) for an external pressure
  vessel,and (           ) for a flanged joint.
• The impurity elements S,P may make
  respectively carbon steel (              )
  brittleness, (        ) brittleness.
• Plastics is the ability of deformation
  without (         ) when a force act on the
  material.
• The strength properties of a material, such
  as (           ), (            ), and the
  plasticity properties,such as (        ) ,( ),
  have significant influences on its selection
  for a given application.
• The material of 0Cr13 is (     ) steel, its
  contents of carbon is (     ).
• Selecting materials mainly depends on
  four kinds of mechanical properties .They
  are
      (         ) ,(      ),(         ),and
  (          ).
•
      Explain the meanings of each
               designation
1Cr18Ni9Ti   Stainless   1—0.1%(C),18—18%(Cr),
               Steel      9—9%(Ni)
QT450—5

2Cr13

20

10g

18MnMoNbR
     Answer following question
•   How to make a steel stick softer?
•   Give two methods to decrease the
    thermal tresses in fixed-tubesheet heat
    exchanger.
•   Write a typical steel’s Number according
    following requirement and point out the
    meaning of each number and alphabet.
     high carbon steel
     medium carbon steel
low carbon steel
common carbon steel
high grade steel
super high grade steel
boiling steel
full killed steel
semi-killed steel
pressure vessel steel
boiler steel
high silicon cast iron
grey cast iron
spherical graphite cast iron
Stainless steel
Chromium Stainless Steel
Chromium-nickel Stainless Steel
Low alloy steel
alloy steel
Heat-resisting Steel
high temperature steel
low temperature steel

				
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posted:8/12/2012
language:English
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