CN105385956A

CN105385956A - Diversion pressure pipeline of hydropower station

Info

Publication number: CN105385956A
Application number: CN201510913393.XA
Authority: CN
Inventors: 郭策
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-12-12
Filing date: 2015-12-12
Publication date: 2016-03-09

Abstract

The invention relates to a diversion pressure pipeline of a hydropower station and belongs to the field of hydroelectric power. The material of the diversion pressure pipeline of the hydropower station is improved, so that the strength and impact energy resistance of the pressure pipeline are greatly improved, and accordingly the durability of a hydroelectric power device is improved totally.

Description

A kind of power station diversion penstock

Technical field

The invention belongs to water generating field, especially equipment for hydroelectric station, particularly relate to a kind of power station diversion penstock.

Background technology

The diversion penstock in power station is as the major parts of water-storage in hydroelectric project, the hydraulic pressure of its surge pressure and power station of subject water hammer for a long time impacts, therefore its shock-resistance will unusual height, what have a lot of power station to adopt at present is that the steel plate of 600MPa level is prepared from, but generally import is relied on for the diversion penstock of 800MPa or more, although but can meet the demands for the diversion penstock intensity of import, but its toughness and weldability also usually can not meet requirement, therefore be badly in need of developing a kind of high strength and the diversion penstock with excellent toughness and welding property.

Summary of the invention

The object of the invention is to propose a kind of power station diversion penstock.

Realize especially by following technique means:

A kind of power station diversion penstock, the chemical composition of described diversion penstock material is by weight percentage: C:0.02 ~ 0.06%, Si:0.18 ~ 0.22%, Mn:1.2 ~ 1.8%, Nb:0.02 ~ 0.08%, Ti:0.02 ~ 0.06%, Ni:0.2 ~ 0.6%, Als:0.05 ~ 0.10%, V:0.03 ~ 0.08%, Cr:0.5 ~ 1.1%, Mo:0.38 ~ 0.60%, Cu:0.2 ~ 0.5%, B:0.001 ~ 0.003%, RE:0.02 ~ 0.06%, P<0.02%, S<0.01%, N<0.001%, surplus is Fe and inevitable impurity.

In the microtexture of described diversion penstock, the volume percent of tempered sorbite+tempered martensite is 80 ~ 88%, wherein in the cross section of described diversion penstock, 2mm below from surface to surface, the area occupation ratio of tempered sorbite+tempered martensite is 1.2 ~ 1.5 times of center, and wherein surface is to following 2mm place, surface, the area occupation ratio of tempered martensite is 1.3 ~ 1.6 times of center; Described center is the area of each 1mm of the inside external expansion of cross section dotted line.

Described RE is mishmetal, and by weight percentage, Ce is 18 ~ 22%, Pr is 20 ~ 25%, and surplus is La and inevitable impurity.

The room-temperature yield strength of described diversion penstock is 720 ~ 780MPa, and tensile strength is 880 ~ 960MPa, and section elongation is 18 ~ 22%, and-30 DEG C of ballistic works are 50 ~ 60J.

Described diversion penstock carries out following heat treatment step after shaping:

(1) insert in quenching furnance by diversion penstock work in-process, be heated to 920 ~ 960 DEG C with stove, insulation 30 ~ 60min, then inserts in quenching oil to hang out after being chilled to 280 ~ 300 DEG C and carries out water-spraying control to room temperature.

(2) work in-process after quenching are placed in deep cooling box and are cooled to-80 ~-120 DEG C, go out deep cooling box after keeping this temperature 20 ~ 30min and return to room temperature.

(3) be placed in tempering stove by the work in-process after deep cooling, be heated to 580 ~ 680 DEG C with stove, air cooling of coming out of the stove after insulation 20 ~ 50min, obtains diversion penstock finished product.

effect of the present invention is.

1, by improving the component concentration of diversion penstock, especially the reasonable restriction of Ti content, to make in its microtexture TiC particulate can Dispersed precipitate, thus effective inhibiting grain growth, with the addition of RE, the crystal grain with the use of refinement, makes its over-all properties obtain and significantly improves simultaneously.

2, by rationally limiting its microtexture, the intensity at the pipe surface place when not increasing expensive element is enhanced, and overall toughness improves.

3, with the coordinating of specific heat treatment system after rationally being limited by component concentration, pipeline strength is strengthened greatly, and especially quench cooled adopts two sections of processes, makes surface intensity more be strengthened and ensure that welding property.

Embodiment

embodiment 1

A kind of power station diversion penstock, the chemical composition of described diversion penstock material is by weight percentage: C:0.03%, Si:0.20%, Mn:1.6%, Nb:0.06%, Ti:0.05%, Ni:0.2 ~ 0.6%, Als(dissolved aluminum): 0.08%, V:0.05%, Cr:0.9%, Mo:0.52%, Cu:0.3%, B:0.002%, RE:0.03%, P:0.01%, S:0.001%, N:0.0002%, surplus is Fe and inevitable impurity; , Ce is 19%, Pr is 22% in described RE by weight percentage, and surplus is La and inevitable impurity.

In the microtexture of described diversion penstock, the volume percent of tempered sorbite+tempered martensite is 80 ~ 88%, wherein in the cross section of described diversion penstock, 2mm below from surface to surface, the area occupation ratio of tempered sorbite+tempered martensite is 1.3 times of center, and wherein surface is to following 2mm place, surface, the area occupation ratio of tempered martensite is 1.5 times of center; Described center is the area of each 1mm of the inside external expansion of cross section dotted line.

The room-temperature yield strength of described diversion penstock is 760MPa, and tensile strength is 892MPa, and section elongation is 19%, and-30 DEG C of ballistic works are 55J.

embodiment 2

Described in embodiment 1, the diversion penstock of composition carries out following heat treatment step after shaping:

(1) insert in quenching furnance by diversion penstock work in-process, be heated to 950 DEG C with stove, insulation 53min, then inserts in quenching oil to hang out after being chilled to 292 DEG C and carries out water-spraying control to room temperature.

(2) work in-process after quenching are placed in deep cooling box and are cooled to-92 DEG C, go out deep cooling box after keeping this temperature 25min and return to room temperature.

(3) be placed in tempering stove by the work in-process after deep cooling, be heated to 622 DEG C with stove, air cooling of coming out of the stove after insulation 32min, obtains diversion penstock finished product.

Claims

1. a power station diversion penstock, it is characterized in that, the chemical composition of described diversion penstock material is by weight percentage: C:0.02 ~ 0.06%, Si:0.18 ~ 0.22%, Mn:1.2 ~ 1.8%, Nb:0.02 ~ 0.08%, Ti:0.02 ~ 0.06%, Ni:0.2 ~ 0.6%, Als:0.05 ~ 0.10%, V:0.03 ~ 0.08%, Cr:0.5 ~ 1.1%, Mo:0.38 ~ 0.60%, Cu:0.2 ~ 0.5%, B:0.001 ~ 0.003%, RE:0.02 ~ 0.06%, P<0.02%, S<0.01%, N<0.001%, surplus is Fe and inevitable impurity,

2. power station according to claim 1 diversion penstock, is characterized in that, the room-temperature yield strength of described diversion penstock is 720 ~ 780MPa, and tensile strength is 880 ~ 960MPa, and section elongation is 18 ~ 22%, and-30 DEG C of ballistic works are 50 ~ 60J.

3. power station according to claim 1 and 2 diversion penstock, is characterized in that, described diversion penstock carries out following heat treatment step after shaping:

(1) insert in quenching furnance by diversion penstock work in-process, be heated to 920 ~ 960 DEG C (preferably 930 ~ 950 DEG C) with stove, insulation 30 ~ 60min, then inserts in quenching oil to hang out after being chilled to 280 ~ 300 DEG C and carries out water-spraying control to room temperature;

(2) work in-process after quenching are placed in deep cooling box and are cooled to-80 ~-120 DEG C, go out deep cooling box after keeping this temperature 20 ~ 30min and return to room temperature;