CN205741134U

CN205741134U - Tee pipe fitting scene local heat treatmet device

Info

Publication number: CN205741134U
Application number: CN201620504389.8U
Authority: CN
Inventors: 杨学义; 林国林; 唐拓; 王冬雪; 王禹; 包镇回
Original assignee: JILIN HAOYU ELECTRIC CO Ltd
Current assignee: JILIN HAOYU ELECTRIC CO Ltd
Priority date: 2016-05-30
Filing date: 2016-05-30
Publication date: 2016-11-30
Anticipated expiration: 2026-05-30

Abstract

A kind of tee pipe fitting scene local heat treatmet device, it is included on the pipeline in three directions layout wound form rope form heater, each heating region arranges main temperature-control heat couple, tracklayer heater is arranged at the adapter of tee pipe fitting, tracklayer heater is fitted in described adapter outer wall, and described supervisor's outer wall installs additional temperature-control heat couple.This utility model provides a kind of tee pipe fitting scene local heat treatmet device that thermal effectiveness is effectively ensured.

Description

Tee pipe fitting scene local heat treatmet device

Technical field

This utility model relates to a kind of tee pipe fitting scene local heat treatmet device.

Background technology

For tee pipe fitting, gas furnace cannot be put into more greatly due to job site or volume, after welding, need butt welded seam Carrying out on-the-spot local heat treatmet, generally arrange wound form rope form heater on pipeline, each heating region arranges temperature control thermoelectricity Even, wound form heater cannot be arranged for coupling part i.e. appropriate department, when causing heat treatment, commissure temperature does not reaches tempering Temperature, affects thermal effectiveness.

Summary of the invention

For the deficiency that the thermal effectiveness overcoming existing tee pipe fitting scene local heat treatmet is poor, this utility model carries Supply a kind of tee pipe fitting scene local heat treatmet device that thermal effectiveness is effectively ensured.

This utility model solves its technical problem and be the technical scheme is that

A kind of tee pipe fitting scene local heat treatmet device, is included on the pipeline in three directions layout wound form rope form and adds Hot device, each heating region main temperature-control heat couple of layout, the appropriate department at tee pipe fitting arranges that tracklayer heater, crawler type add Hot device is fitted in described supervisor's outer wall, and described supervisor's outer wall installs additional temperature-control heat couple.

Further, described main temperature-control heat couple and additional temperature-control heat couple all by thin stainless steel substrates pressure welding at heating region Surface.

The beneficial effects of the utility model are mainly manifested in: there are also installed tracklayer heater appropriate department, during heat treatment Can guarantee that commissure effectively reaches temperature, thermal effectiveness has been effectively ensured.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of tee pipe fitting scene local heat treatmet device.

Detailed description of the invention

Below in conjunction with the accompanying drawings this utility model is further described.

With reference to Fig. 1, a kind of tee pipe fitting scene local heat treatmet device, it is included on the pipeline in three directions layout and is wound around Formula rope form heater, each heating region main temperature-control heat couple of layout, the appropriate department at tee pipe fitting arranges tracklayer heater, Tracklayer heater is fitted in described supervisor's outer wall, and described supervisor's outer wall installs additional temperature-control heat couple.

In the present embodiment, the postwelding high tempering heat treatment of tee pipe fitting welding point: be with certain intensification by weldment Speed is heated to below steel phase transition temperature Ac1, is incubated the setting time, and then weldment is cooled to room temperature, to change with the speed set A kind of welding Technology for Heating Processing of the kind metallographic structure of welding point, performance and elimination residual stress.

P91, P92 Heat-Treatment of Steel process:

A () cooling processes；After welding terminates, cooling immediately carries out martensite transfor mation, and transition temperature is 80～100 DEG C.Constant temperature Time is according to depending on pipe wall thickness generally 1～3h；But must be whole welding point temperature be attained by simultaneously 100 DEG C with Under. for enabling inside and outside wall temperature uniform, after welding terminates and in thermostatic process 1) sealing plate of pipe ends can be beaten Open；Allow the free air circulation of tube interior.2) in the case of pipeline wall temperature is relatively low, can be by the heater of preheating and guarantor Adiabator is removed；3) guarantee all to drop to inside and outside whole weld seam 80～100 DEG C of constant temperature 1～3 hours simultaneously, complete martensite transfor mation Whole transformation.4) if martensite transformation temperature can not be possible to supercool massive martensite less than less than 50 DEG C and Produce fine cracks；Continue cooling to be possible to make weld cracking under welding residual stress effect.

(b) dehydrogenation: due to the most irresistible factor in heat treatment process, it is impossible to carry out post weld heat treatment immediately Time, can first carry out dehydrogenation；Treatment temperature is 350 DEG C, and the time is 2～3 hours, is then slowly cooled to room temperature.

(c) post weld heat treatment: as a example by thickness of steel pipe is as 110mm: 1) programming rate less than 300 DEG C≤70 DEG C is per hour； 2) more than 300 DEG C time≤56 DEG C per hour；Setting of heat treatment temperature: the thermostat temperature of post weld heat treatment is as (760 ± 10 DEG C). Should be according to the content of wlding Ni Mn used during actual heat treatment；The heat treatment temperature that adjustment is actual: 1) as W (Ni+Mn) When≤1.0%, heat treatment temperature is the upper limit；2) during 1.0%≤W (Ni+Mn)≤1.5%, heat treatment temperature should be 760 DEG C；Simultaneously Error during heating it is considered as when design temperature.

The setting of (d) heat treatment constant temperature time；1) ASME standard P91/P92 steel weld seam heat treatment constant temperature time is pressed minimum 25mm/1h, as 57mm thickness is about 2.25 hours.2) by experiment, whether at the most overall stove formula heat of far infrared band heater It is all inadequate for managing this time；P92 uses infrared ray belt heat treatment typical time to be 6～6.5 hours；3) 110mm thickness Generally 11～12 hours constant temperature.May infer that stove formula heat treatment should be able to meet HB≤250 in 11 hours according to data in table；Internal diameter It 11 hours is qualified that the P92 of DIN398x110mm uses stove formula bulk heat treatmet to press, and uses far infrared belt heat treatment method It is actually needed more than 12 hours.4) be can get T=[(2.5～3.5) δ/25]/h entirety by following empirical data and enter furnace treatment reason Take off limit value.

The rope form heater of the present embodiment and tracklayer heater all use Far infrared heating method to heat, and should make every effort to inside and outside Wall and weld seam both sides homogeneous temperature；Thermocouple calibration is qualified and before the deadline, and thermocouple uses thin stainless steel substrates to use energy storage The method of pressure welding is fixed on weldment surface, it is necessary to assure the hot junction of thermocouple contacts well with weldment.

Claims

1. a tee pipe fitting scene local heat treatmet device, is included on the pipeline in three directions layout wound form rope form heating Device, each heating region arranges main temperature-control heat couple, it is characterised in that: the appropriate department at tee pipe fitting arranges that crawler type heats Device, tracklayer heater is fitted in described supervisor's outer wall, and described supervisor's outer wall installs additional temperature-control heat couple.

2. a kind of tee pipe fitting scene local heat treatmet device as claimed in claim 1, it is characterised in that: described master control warms Galvanic couple and additional temperature-control heat couple all by thin stainless steel substrates pressure welding on heating region surface.