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    Heat Treatment for Pipe Fittings Manufactured to EN 10253-2

    1. Heat treatment methods


    EN 10253-2 pipe fittings, in both carbon steel or alloy steel, shall be furnished with at least one of the following heat treatment process,

    (1)Normalizing(denotation "N"): normalizing is an austenitizing heating circle followed by cooling the pipe fittings in still or slightly agitated air.
    (2)Normalizing and Tempering(denotation "NT"): A tempering process is usually required after the normalizing heat treatment. The tempering heat treatment is a process in which previously hardened or normalized pipe fittings are usually heated to a temperature below the lower critical temperature and cooled at a suitable rate, primarily to increase ductility and toughness, but also to increase the grain size of the matrix.
    Normalizing & Tempering Furnace for EN 10253-2 pipe fittings
    Normalizing & Tempering Furnace for EN 10253-2 pipe fittings
    (3)Isothermal Annealing(denotation "I"): Isothermal annealing is an alternative method of cooling that consists of rapidly cooling the pipe fittings in the furnace from the annealing temperature to a temperature just below the transformation range and holding the pipe fittings and furnace at this temperature for one or more hours. After this soaking process, the pipe fittings may be safely air cooled. The steels can be softened by isothermal annealing to facilitate further cold machining(end beveling in this case).
    (4)Quenching and Tempering(denotation "QT"): Quenching refers to the process of rapidly cooling the pipe fittings in oil or water from the austenitizing or solution treating temperature. EN 10253-2 pipe fittings made of carbon steel or alloy steel are quenched to produce controlled amounts of martensite in the microstructure as well as to achieve required hardness, strength or toughness. It is often followed by a tempering process.
    Quenching Furnace & Quenchant Water Pool for EN 10253-2 Fittings
    Quenching Furnace & Quenchant Water Pool for EN 10253-2 Fittings

    2. Recommended heat treatment temperatures according to EN 10253-2

    Steel Grades
    Heat 
    Treatment
    Austenitizing 
    Temperature
    Cooling 
    Medium
    Tempering 
    Temperature
    Cooling 
    Medium
    P235TR2
    N
    880~940
    air
     
     
    P265TR2
    N
    880~940
    air
     
     
    P235GH
    N
    880~940
    air
     
     
    P265GH
    N
    880~940
    air
     
     
    16Mo3
    N
    890~950
    air
     
     
    10CrMo5-5
    NT
    900~960
    air
    650-750
    air
    13CrMo4-5
    NT
    900~960
    air
    660-730
    air
    10CrMo9-10
    NT
    900~960
    air
    680-750
    air
    X11CrMo5
    I
    890~950
    furnace atmos.
     
     
    X11CrMo5
    NT1
    930~980
    air
    710-770
    air
    X11CrMo5
    NT2
    930~980
    air
    710-750
    air
    X11CrMo9-1
    I
    950~980
    furnace atmos.
     
     
    X11CrMo9-1
    NT
    890~950
    air
    720-800
    air
    X10CrMoVNb9-1
    NT
    1040~1090
    air
    730-830
    air
    P355N
    N
    -
    -
     
     
    P355NH
    N
    -
    -
     
     
    P355NL1
    N
    -
    -
     
     
    P215NL
    N
    900-940
     
     
     
    P265NL
    N
    880-940
     
     
     
    12Ni14
    QT
    820-880
    water or oil
    580-660
    air
    X10Ni9
    QT
    770-820
    water or oil
    540-660
    air

                  Yield-Temperature ratings and impact properties for EN 10253-2 carbon steel and alloy steel.

    Views: 9173  Author:METALS INDUSTRIAL  Date:2015/12/14