Carbon steel ASTM A105 forgings require heat treatment or not
ASTM A105 was common used in forgings in standard MSS,ASME and API. Or the specification by purchaser.In some product description request heat treatment,or ASTM A105N. here the “N” refer to normalizing,one kind of heat treatment ,but some don’t make clearly request to heat treatment or not. If there are situation in the following aspect,must do heat treatment to be sure the forgings are safe for piping applications.
A.Flange above Class 300
A.1.Flanges of special design where the design pressure at the design temperature exceeds the pressure-temperature rating of class 300,Group 1.1
A.2.Flanges of special design where the design pressure or design temperature are not known.
A.3.Piping components other than flanges which meet both of the following criteria:(1) over NPS A.4. and (2) above class.300 and
A.5..Piping components of Special class other than flanges which meet both of the following criteria:(1) over NPS 4 and (2) when the working pressure at the operating temperature exceeds the tabulated values for special class 300.Group 1.1
B.Heat treatment,when required in the above situation shall be annealing,normalizing,or normalizing and tempering or quenching and tempering in accordance with specification A961/196M.
Quenching shall consist of either (1) fully austenitizing in forgings followed by quenching in a suitable liquid medium or (2) using a multiple stage procedure whereby the forgings are first fully austenitized and rapidly cooled,then reheated to partially reaustenitize,followed by quenching in a suitable liquid medium,All quenched forgings shall be tempered as prescribed in Specification A961/A961M.
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