Heat treatment issues for steel pipes used in boilers?
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The existing steel pipes for boilers have a specification of φ63.5×9.5 mm, are made of 12Cr1MoVG material, are heated to 740 degrees Celsius, and held at that temperature for 0.5 hours. Questions: 1. Can one on-site heat treatment device process 20 welds simultaneously? 2. Does a thermocouple need to be installed at every weld joint for temperature measurement, or are a few representative ones sufficient? 3. Must the model of the heat treatment equipment and the unit’s internal identification number be included on the heat treatment record?
The heat treatment requirements are very strict, and there is a responsibility system in place! It is necessary to specify the model and number
Each thermocouple is associated with a recorder and a temperature controller. At least one thermocouple is required per weld joint to monitor the temperature. One heat treatment process cannot eliminate all 20 weld joints formed on-site at the same time.
I don’t understand this. If it’s a problem with the flow meter, then you can ask me
1. Can one on-site heat treatment device process 20 welds simultaneously? Check the power of the heat treatment control cabinet, the number of wiring terminals, and the layout of cables on site. Given the specifications of your tubes, the required power is not high; a heating strip with a power of 5 KW and a length of 1 meter can handle at least 3-4 processes. Seven heating strips, along with 3 sets of three-phase heating cables, will be sufficient! 2. Does a thermocouple need to be installed at every weld joint for temperature measurement, or are a few representative ones sufficient? In my opinion, it’s sufficient as long as it is representative; the key is that the heat treatment equipment has undergone temperature uniformity tests, so it doesn’t matter if more sensors are installed – it’s just an additional number of testing points. 3. Must the model of the heat treatment equipment and the unit’s internal identification number be included on the heat treatment record? Upon passing the inspection, fill in the model number and other details of the heat treatment equipment as specified in the company’s quality manual or warranty manual, to facilitate archiving for future reference. To be signed by the heat treatment operator, the heat treatment responsible engineer, or the inspection engineer, etc.
So professional and comprehensive; I’ve learned a lot.