Chemical Requirements Carbon Alloy Steels used in Piping applications

ASTM A53
Specification for Seamless and Welded Black and Hot-Dipped Galvanized Steel Pipe

Note:

  1. The total composition for these five elements shall not exceed 1.00%.

ASTM A105
Specification for Carbon Steel Forgings for Piping Applications

Notes:

  1. The sum of Copper, Nickel, Niobium, Molybdenum and Vanadium shall not exceed 1.00%.
  2. The sum of Niobium and Molybdenum shall not exceed 0.32%.
    Note: For each reduction of 0.01% below the specified carbon maximum (0.35%), an increase of 0.06% Manganese above the specified maximum (1.05%) will be permitted up to a maximum of 1.35%.

ASTM A106
Specification for Seamless Carbon Steel Pipe for High-Temperature Service

Notes:

  1. For each reduction of 0.01% below the specified Carbon maximum, an increase of 0.06% Manganese above the specified maximum will be permitted up to a maximum of 1.35%.
  2. Unless otherwise specified by the purchaser, for each reduction of 0.01% below the specified Carbon maximum, an increase of 0.06% Manganese above the specified maximum will be permitted up to a maximum of 1.65%.
  3. These five elements combined shall not exceed 1%.

ASTM A216
Specification for Steel Castings, Carbon, Suitable for Fusion Welding, for High-Temperature Service

Notes:

  1. For each reduction of 0.01% below the specified maximum Carbon content, an increase of 0.04% manganese above the specified maximum will be permitted up to a maximum of 1.10%.
  2. For each reduction of 0.01% below the specified maximum Carbon content, an increase of 0.04% Mn above the specified maximum will be permitted up to a maximum of 1.28%.
  3. For each reduction of 0.01% below the specified maximum Carbon content, an increase of 0.04% manganese above the specified maximum will be permitted to a maximum of 1.40%.

ASTM A234
Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service

Notes:

  1. Fittings made from bar or plate may have 0.35 max carbon.
  2. Fittings made from forgings may have 0.35 max Carbon and 0.35 max Silicon with no minimum.
  3. For each reduction of 0.01% below the specified Carbon maximum, an increase of 0.06% Manganese above the specified maximum will be permitted, up to a maximum of 1.35%.
  4. The sum of Copper, Nickel, Niobium, and Molybdenum shall not exceed 1.00%.
  5. The sum of Niobium and Molybdenum shall not exceed 0.32%.
  6. Applies both to heat and product analyses.

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