Heat treatment method of G115 steel small-diameter tube heated by flexible ceramic resistor
A heat treatment method and flexible ceramic technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems such as making clear regulations on G115 steel small-diameter tube technology, and achieve the effect of ensuring performance
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Embodiment 1
[0033] Embodiment one: if figure 1 , 2 , Shown in 3, a kind of G115 steel small-diameter pipe heat treatment method by flexible ceramic resistance heating, comprises:
[0034] Heating treatment S102: Heating the welded G115 steel small-diameter pipe at 300°C / hour to the heating limit temperature S202 according to the heating control conditions;
[0035] Heat preservation treatment S103: heat preservation control of the heated G115 steel small-diameter pipe according to heat preservation control conditions and heat preservation time S203;
[0036] Cooling treatment S104: cooling the heat-preserved G115 steel small-diameter pipe at 300°C / hour to the cooling limit temperature S204.
[0037] Due to the use of heating treatment: heat the welded G115 steel small-diameter pipe according to the heating control conditions at 300 ° C / hour to the heating limit temperature; heat preservation treatment: heat the heated G115 steel small-diameter pipe according to the heat preservation c...
Embodiment 2
[0054] 1) Weld the main steam drain pipe with a specification of φ76mm×11.91mm according to the G115 welding process;
[0055] 2) After the G115 small-diameter tube is welded, slowly cool to 60°C, install a thermocouple so that the temperature control thermocouple is arranged in the center of the welded joint;
[0056] 3) Press the rope heater figure 1 Winding, the width is 250mm, the insulation width is 400mm,
[0057] 4) The temperature is raised to 790°C at 300°C / h, and the holding time is calculated as 3 hours based on 15 minutes / mm;
[0058] 5) Control the cooling rate from 300°C / h to 200°C, and cut off the power supply of the heater;
[0059] 6) Cool to room temperature, remove the heater, thermocouple and insulation device;
[0060] According to DL / T868-2014 "Welding Procedure Qualification Regulations", the hardness and impact test of the welded joints are carried out, and the results are as follows:
[0061]
Embodiment 3
[0063] 1) Weld the high-temperature reheat steam drain pipe with a specification of φ60.3×5.33 according to the G115 welding process;
[0064] 2) After the G115 small-diameter tube is welded, slowly cool to 50°C, install a thermocouple so that the temperature control thermocouple is arranged in the center of the welded joint;
[0065] 3) Press the rope heater image 3 Winding, the width is 200mm, and the insulation width is 350mm;
[0066] 4) The temperature is raised from 300°C / h to 800°C, and the holding time is calculated as 80min based on 15 minutes / mm;
[0067] 5) Control the cooling rate from 300°C / h to 200°C, and cut off the power supply of the heater;
[0068] According to DL / T868-2014 "Welding Procedure Qualification Regulations", the hardness test of welded joints is carried out, and the results are as follows
[0069]
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