Refining
 







Refining








Goal:

The purpose of this thermal treatment is to achieve a granular structure, while increasing offset yield strength and toughness and a slight change in its hardness.

Applications:

High-tension components are made with the least possible dimensions of alloyed and non-alloyed steels. For example, in the Jig and Fixture building, the receiver levers are made of refining steels.

Methods:

refining is carried out according to the following steps.

Warming up to hardening temperature and quench (the hardening principles as already said is true here too) and
Return at high temperature
.
Selection of refining steel:

The choice of refining steel depends on the cross-sectional area and the offset yield strength or optimum toughness.

Non-alloy refining steels in large sections are not refined deeply and comprehensively because the critical cooling velocity inside the work piece is not achievable. For this reason, alloyed refining steels are used in large sections and high loading.

Table 1: Heat treatment of refining steel
Return temperature
C
Hardening temperature
C
Normal annealing temperature
C
Soft annealing hardness
HB 30
Soft annealing temperature
C
Short characteristic according to DIN 17006Material number
660...550890...860910...880156700...650C 221.0402
660...550850...820870...840207700...650Ck 451.1191
680...540860...830880...850248700...65030 CrNiMo 81.6580
680...540850...820880...840217720...68042 CrMo 41.7225
Table 2: Relationship between tensile strength and elongation of relative length with cross-section

Extension of relative length to% in thickness
   Tensile strength to N / mm2 in thickness    Short characteristic according to DIN 17006 Material number


180...100
mm
100...41
mm
40...17
mm
16
mm
180...100
mm
100...41
mm
40...17
mm
16
mm
DIN 17006

--2220--640...490690...540C 221.0402
-171614-760...620800...660840...700Ck 451.1191
1110991180...9801270...11801180...12301420...123030 CrNiMo 81.6580
13121110930...7801180...9801270...10801270...108042 CrMo 41.7225
 

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