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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 |
(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.
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| 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
|
Related: Mechanical properties of EN 10253-2 pipe fittings(Tensile/Yield/Elongation).
Views: Author：hbmetals Date:15/12/14