Carbon          {c}                                 :                  Strength / hardness.

Manganese {Mn}                         :                  Toughness.

Silicon {Si}                                 :                  <0.3% deoxidizer [avoid porosity].

Chromium {cr}                            :                  corrosion resistance.

Molybdenum {Mo}                       :                  1% is for creep resistance.

Nickel {Ni}                                 :                  low temp application.

Titanium {Ti}                               :                  used to avoid weld decay.

Niobium {Nb}                              :                  used to avoid weld decay.

One of the duties of the visual/ welding inspector is materials inspection & there are a number of situations where this will be required.

  1. at the plate [or] pipe mill.
  2. during fabrication of construction
  3. after installation of material, usually during a planned maintenance program, outage or shut down.
  4. all of the above.

There are three essential aspects to material inspection that the inspector should consider.

  1. material type & weld ability.
  2. material trace ability.
  3. material condition & dimensions.
  4. all of the above.