A acid-resistant pipeline steel plate with large wall thickness x52ms produced by lf-rh refining process and its manufacturing method
A LF-RH, steel plate technology, applied in the field of metallurgy, can solve the problems of large and thick-walled acid-resistant and corrosion-resistant pipeline steel drop hammer performance, achieve good low-temperature toughness and corrosion resistance, suppress austenite grains The effect of growing up and improving the uniformity of deformation
Active Publication Date: 2021-11-30
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
View PDF10 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] Patent announcement number CN108624811A proposes a large thick-walled acid-resistant and corrosion-resistant pipeline steel and its production method. The patented production process is the RH-LF refining process, which is different from the patented LF-RH refining process, and the design components It is very different from this patent. This patent only mentions the HIC resistance performance, and does not mention the drop hammer performance of large thick-walled acid-resistant and corrosion-resistant pipeline steel. Hammer average shear surface ratio ≥ 85%
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1-3
[0037] According to the chemical composition range and manufacturing method of the present invention, KR molten iron pretreatment—converter smelting—LF refining—RH vacuum degassing—continuous casting—continuous casting billet adding hood and slow cooling — continuous casting billet inspection and cleaning — billet heating — high pressure Process steps such as water descaling-rough rolling-intermediate billet cooling-finishing-ACC cooling, etc., the production thickness is 35.1mm (Example 1), 38.3mm (Example 2) and 44.2mm (Example 3) under acidic conditions of steel plates.
[0038] The specific process of the above-mentioned heating, rolling and cooling stages is as follows: heating the 370mm thick continuous casting billet to 1180°C, keeping the temperature for 180min (Examples 1, 2) or heating the 450mm thick continuous casting billet to 1200°C, keeping the temperature for 210min (Example 3). ), use high-pressure water for descaling after the continuous casting billet is rel...
Embodiment 1
[0044] Table 3 HIC resistance properties of X52MS steel sheets in Examples 1, 2 and 3
[0045]
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 |
|---|---|---|
| thickness | aaaaa | aaaaa |
| yield strength | aaaaa | aaaaa |
| tensile strength | aaaaa | aaaaa |
Login to View More
Abstract
The invention relates to a large-wall X52MS acid-resistant pipeline steel plate produced by LF-RH refining process, characterized in that: the chemical composition of the steel plate is C 0.03-0.07, Si 0.2-0.4; Mn 1.0-1.4; Al 0.02‑0.04; Nb 0.02‑0.05; V≤0.02; Ti 0.004‑0.012; Cr 0.1‑0.4; Mo 0.1‑0.2; B≤0.0005; P≤0.012; 0.005; [H]≤0.0015; cold crack sensitivity coefficient Pcm≤0.19, the balance is Fe and unavoidable impurities. The manufacturing method includes KR hot metal pretreatment, converter smelting, LF and RH refining, slab continuous casting, slab heating, rough rolling, intermediate slab cooling, finish rolling, ACC cooling and other processes. The thickness of the steel plate manufactured by the invention is 35.1-44.2mm, the yield strength is 380-440MPa, the tensile strength is 490-570MPa, the elongation rate is ≥33%, the yield strength ratio is ≤0.90; It can meet the requirements of large wall thickness X52MS pipeline steel used in acidic environment, and has good HIC resistance and low temperature toughness.
Description
technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a large-wall thickness X52MS acid-resistant pipeline steel plate produced by an LF-RH refining process and a manufacturing method thereof. Background technique [0002] As the main transportation method of oil and gas resources, long-distance pipelines are widely used in onshore and submarine energy projects. In order to meet the requirements of high gas transmission volume and safety, for the transmission medium containing hydrogen sulfide corrosive gas, pipeline steel that is resistant to wet hydrogen sulfide corrosion is usually used. With the transfer of drilling areas to desert, deep sea and other harsh environments, the demand for acid-resistant pipelines with large wall thickness is becoming more and more prominent, and the safety of products directly determines the design and implementation of the entire project. However, this type of pipeline steel belongs to the large...
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 & AuthorityPatents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/26C22C38/24C22C38/28C22C38/22C21D8/02
CPCC21D8/0205C21D8/0226C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28
Inventor许峰白云苗丕峰林涛孙宪进石艾来诸建阳
OwnerJIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD