CN205741133U

CN205741133U - Header scene local heat treatmet device

Info

Publication number: CN205741133U
Application number: CN201620504265.XU
Authority: CN
Inventors: 刘龙; 王可彬; 史晓磊; 王明阳; 张幸海; 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 header scene local heat treatmet device, described header is provided with hand hole short tube, the described end of hand hole short tube is welded with the inner side of closure plate, described local heat treatmet device includes extension, heater and temperature-control heat couple, described extension connects with the outside of closure plate, described extension is equal with the external diameter of described closure plate, hand hole short tube, described heaters set is on described hand hole short tube, closure plate and extension, and described heater arrangement is centered by the weld seam between described hand hole short tube and closure plate, described temperature-control heat couple is installed in described commissure.This utility model provides a kind of header scene local heat treatmet device that thermal effectiveness is effectively ensured.

Description

Header scene local heat treatmet device

Technical field

This utility model relates to a kind of header scene local heat treatmet device.

Background technology

High Temperature High Pressure header/short tube+closure plate attachment weld, cannot put into more greatly gas furnace due to site operation or volume In, need butt welded seam to carry out on-the-spot local heat treatmet after welding, processed weld seam cannot be in the center of heter temperature, past The highest even more than Ac1 temperature of immediate vicinity temperature toward short tube, the hardness/intensity of short tube is greatly reduced.

Summary of the invention

For the deficiency that the thermal effectiveness overcoming existing header scene local heat treatmet mode is poor, this utility model carries Supply a kind of header 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 header scene local heat treatmet device, described header is provided with hand hole short tube, the end of described hand hole short tube with The inner side welding of closure plate, described local heat treatmet device includes extension, heater and temperature-control heat couple, and described extension is with stifled The outside of plate connects, and described extension is equal with the external diameter of described closure plate, hand hole short tube, and described heaters set is short at described hand hole On pipe, closure plate and extension, and described heater arrangement is centered by the weld seam between described hand hole short tube and closure plate, institute State commissure and described temperature-control heat couple is installed.

Further, described temperature-control heat couple by thin stainless steel substrates pressure welding on heating region surface.

Further, described temperature-control heat couple has 2n, and the circular arcs such as n is natural number, 2n temperature-control heat couple interval is arranged On described weld seam, and distribution symmetrical above and below.

Described extension is identical with the internal diameter of described hand hole short tube, it is also possible to unequal.

The beneficial effects of the utility model are mainly manifested in: thermal effectiveness is effectively ensured.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of header 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 header scene local heat treatmet device, described header 3 is provided with hand hole short tube 4, and described hand hole is short The end of pipe 4 is welded with the inner side of closure plate 2, and described local heat treatmet device includes extension 5, heater 7 and temperature-control heat couple 6, described extension 5 connects with the outside of closure plate 2, and described extension 5 is equal with the external diameter of described closure plate 2, hand hole short tube 4, institute State heater 7 to be enclosed within described hand hole short tube, closure plate and extension, and described heater 7 arrangement is with described hand hole short tube And centered by the weld seam 1 between closure plate, described temperature-control heat couple 6 is installed in described commissure.

Further, described temperature-control heat couple 6 by thin stainless steel substrates pressure welding on heating region surface.

Further, described temperature-control heat couple 6 has 2n, and n is natural number, 2n cloth such as interval such as temperature-control heat couple 6 circular arc such as grade Put on described weld seam, and distribution symmetrical above and below.

Described extension 5 is equal with the internal diameter of described hand hole short tube 4, it is also possible to unequal.

In the present embodiment, during for ensureing heat treatment, weld seam is in heat treatment center, i.e. maximum temperature center, stifled It is identical that plate end point connects a bore, the short tube that material and wall thickness can be different, as extension, to highest temperature during heat treatment Degree extends to Weld pipe mill, and the thermal effectiveness of weld seam is effectively ensured.

In the present embodiment, the postwelding high tempering heat treatment of header welding joint: be with certain heating rate by weldment Being heated to below steel phase transition temperature Ac1, be incubated the setting time, then weldment is cooled to room temperature, to improve weldering with the speed set A kind of welding Technology for Heating Processing of the metallographic structure of joint, 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 heater of the present embodiment uses Far infrared heating method heating, should make every effort to inside and outside wall and weld seam both sides temperature is equal Even；Thermocouple calibration is qualified and before the deadline, and thermocouple uses thin stainless steel substrates to use the method for energy storage pressure welding to be fixed on weldering Part surface, it is necessary to assure the hot junction of thermocouple contacts well with weldment.

Claims

1. a header scene local heat treatmet device, described header is provided with hand hole short tube, and the end of described hand hole short tube is with stifled The inner side welding of plate, it is characterised in that: described local heat treatmet device includes extension, heater and temperature-control heat couple, described Extension connects with the outside of closure plate, and described extension is equal with the external diameter of described closure plate, hand hole short tube, and described heaters set exists On described hand hole short tube, closure plate and extension, and described heater arrangement is with the weldering between described hand hole short tube and closure plate Centered by seam, described temperature-control heat couple is installed in described commissure.

2. local heat treatmet device in header scene as claimed in claim 1, it is characterised in that: described temperature-control heat couple is by thin Stainless steel substrates pressure welding is on heating region surface.

3. local heat treatmet device in header scene as claimed in claim 1 or 2, it is characterised in that: described temperature-control heat couple has 2n, the circular arcs such as n is natural number, 2n temperature-control heat couple interval is arranged on described weld seam, and distribution symmetrical above and below.

4. local heat treatmet device in header scene as claimed in claim 1 or 2, it is characterised in that: described extension is with described The internal diameter of hand hole short tube is equal.