Processing technology for preparing thermal insulated tubing from structural alloy steel
A technology of alloy structural steel and processing technology, which is applied in the direction of manufacturing tools, heat treatment furnaces, heat treatment equipment, etc., can solve the problems of expensive finished products, complicated process equipment, and difficult operation, and achieve simple operation, simple process equipment, and welding performance good effect
Inactive Publication Date: 2016-06-22
重庆市巴南区仁荣机械厂
View PDF0 Cites 3 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The common points of these two quenching and tempering methods are: complex process equipment, large investment, high technical level, difficult operation, low pass rate and high cost, forcing the finished product to be expensive
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreExamples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0017] The present invention will be further described below in conjunction with embodiment:
[0018] The chemical composition of the alloy structural steel of the present invention is measured by weight percentage, C: 0.25%-0.35%, Mn: 1.2%-1.5%, Si: 0.5%-0.7%, P: ≤0.015%, S: ≤0.01%, Cr : ≤0.05%, Ni: ≤0.1%, V: 0.05%-0.2%, Cu: ≤0.1%, Al: ≤0.01%, the balance is Fe and inevitable inclusions; carbon equivalent Ce≤0.4%. The smelting method of alloy structural steel: it is smelted by electric furnace (EF+LF+VD) plus external refining method.
[0019] There must be no visible white spots, residual shrinkage cavities, delamination, cracks, air bubbles, inclusions, overturning and other defects on the steel low-magnification microstructure test piece. Permissible low-magnification tissue; general looseness, central looseness and segregation are not greater than 1.5 grades.
[0020] The non-metallic inclusions of steel are in accordance with GB10561, and the qualified level is rated i...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| carbon equivalent | aaaaa | aaaaa |
Login to View More
Abstract
The invention discloses a processing technology for preparing a thermal insulated tubing from structural alloy steel. The processing technology comprises 1, carrying out blanking on a qualified tested tubing blank, 2, heating the tubing blank to a temperature of 1300-1340 DEG C, 3, carrying out perforating under hot centering, 4, carrying out heading treatment, 5, carrying out annealing treatment, 6, carrying out pickling, 7, carrying out phosphatization and saponification, 8, carrying out cold drawing treatment, 9, carrying out annealing, pickling, phosphatization and saponification, and cold drawing treatment on the tubing subjected to cold drawing until the tubing size satisfies design requirements, 10, carrying out normalization on the tubing at a normalization temperature of 950-1000 DEG C, 11, carrying out straightening on the tubing and cutting the head and tail of the tubing, and 12, carrying out physical and chemical examination and nondestructive test on the tubing, wherein the microstructure of the tubing comprises ferrite and pearlite and does not contain a Widmannstatten structure. The processing technology can improve thermal insulated tubing performances and prolong a service life.
Description
technical field [0001] Technical field The present invention relates to the processing technology of using alloy structural steel to manufacture heat-insulated oil pipe. Background technique [0002] Thermal recovery technology develops along with petroleum industry technology, it is one of the most effective methods for stabilizing and increasing daily output of low pressure wells, heavy oil wells, old oil wells and oil wells in low temperature zone. It has been widely used and promoted. In particular, heavy oil wells contain crude oil with a high proportion of paraffin and asphalt, which is characterized by heavy oil with high specific gravity, high viscosity and poor fluidity. And some old oil wells are very difficult to mine due to long mining time, low reservoir pressure and poor crude oil fluidity. In order to ensure the stability or increase of daily output of oil wells, thermal recovery technology must be popularized to increase the mining volume. Due to the rapid ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/08B21C37/06C22C38/46
Inventor 李仁荣
Owner 重庆市巴南区仁荣机械厂