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7) (12.5 pts) Assume in the future you are an engineer working for a Rhode Island shipyard. A steel companys sales represent
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Answer #1

1. Will enquire about the tolerances of steel used

Reason - Steel plates, strips, wide flats, and clad plates are to be with the permitted minus tolerances or with no minus tolerance.

2. will ask about the surface finish of steel

Reason-All steels used for shipbuilding are to have a smooth rolled surface and are to be free from any defects liable to have more than an insignificantly adverse effect on their workability and intended use, e.g. laminations, cracks, blow holes, scabs and seams etc.

3.Will ask him to conduct some tensile tests on steel

Reason-The mechanical properties of the steels as stated in the specifications are to be verified by means of tensile tests.

4.Will ask about the carbon content of steel

Reason -Though carbon equivalent (Ceq) is an important property of steel for determining its weldability, in shipbuilding grades of steels, rather than using the carbon equivalent value when assessing weldability, the Pcm-value (susceptibility to cold cracking) is also usually being calculated based on the formula Pcm = % C + % Si/30 + % Mn/20 + % Cu/20 + % Ni/60 + % Cr/20 + % Mo/15 + % V/10 +5* % B. Carbon equivalent, Ceq value for shipbuilding steels is determined by the formula Ceq = % C + % Mn/6 + (% Cr + % Mo + % V)/5 + ( % Ni + % Cu)/15.

5.Will enquire about limit values

Reason-The limit values specified in the specifications for the chemical composition apply to the melt analysis. Minor positive or negative excesses beyond the limit values, established by analysis of the steel product, are acceptable provided that they do not impair the properties of the steel product and/or the tolerances specified in the other relevant standards are not exceeded.

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