ASTM A105 STANDARD CARBON STEEL FLANGES

A105 is an specification dealing with forged carbon steel components.

CHEMICAL COMPOSITION

Element C Mn P S Si Copper Ni Cr Mo V
Composition, % 0.35 max 0.60-1.05 0.035 max 0.040 max 0.10-0.35 0.40 max (1) 0.40 max (1) 0.30 max (1-2) 0.12 max (1-2) 0.08 max

(1) The sum of copper, nickel, chromium, molybdenum and vanadium shall not exceed 1.00%.
(2) The sum of chromium and molybdenum shall not exceed 0.32%.
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%.

MANUFACTURING CONSIDERATIONS

Heat treatment is not mandatory requirement except:

  1. Flanges above Class 300
  2. Flanges of special design where the design pressure at the design temperature exceeds the rating of Class 300.
  3. Flanges of special design where the design pressure or design temperature are not known.
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