High strength hot rolled steel sheet having excellent elongation and method for manufacturing same
A hot-rolled steel plate, high-strength technology, applied in the direction of manufacturing tools, heat treatment furnaces, heat treatment equipment, etc., can solve problems such as increased mining costs
Active Publication Date: 2021-07-23
浦项股份有限公司
View PDF1 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
In addition, as the mining environment becomes harsher, mining costs increase rapidly, and efforts are being made to reduce costs
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 Construction
[0067] Hereinafter, the present invention will be described in more detail through examples. However, it should be noted that the following examples are only used to illustrate the present invention and describe in more detail, and are not intended to limit the scope of rights of the present invention. This is because the scope of rights of the present invention is determined by the content described in the claims and the content reasonably derived therefrom.
[0068] (Example)
[0069] Molten steel having the alloy composition described in the following Table 1 and Table 2 was made into a slab by continuous casting, the slab was heated at 1100-1180°C, and then reheated, extracted, rolled under the conditions described in the following Table 3 Hot-rolled steel sheets with a thickness of 5 mm are manufactured by processing, coiling and cooling. The kinds and fractions of fine structures, average grain size, and mechanical physical properties were measured for the hot-rolled s...
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 |
|---|---|---|
| particle size | aaaaa | aaaaa |
| particle size | aaaaa | aaaaa |
| particle size | aaaaa | aaaaa |
Login to View More
Abstract
An embodiment of the present invention provides a high strength hot rolled steel sheet having excellent elongation and a method for manufacturing same, the high strength hot rolled steel sheet containing, in weight percentage, 0.11-0.14% of C, 0.20-0.50% of Si, 1.8-2.0% of Mn, 0.03% of less of P, 0.02% or less of S, 0.01-0.04% of Nb, 0.5-0.8% of Cr, 0.01-0.03% of Ti, 0.2-0.4% of Cu, 0.1-0.4% of Ni, 0.2-0.4% of Mo, 0.007% or less of N, 0.001-0.006% of Ca, and 0.01-0.05% of Al, with the remainder comprising Fe and inevitable impurities, wherein relational expressions 1 to 3 below are satisfied, and the microstructure includes, by area percentage, 88% or more of bainite (excluding 100%), 10% or less of ferrite (excluding 0%), 2% or less of pearlite (excluding 0%), and 0.8% or less of island martensite (including 0%). [relational expression 1] 7 <= (Mo / 93) / (P / 31) <= 16, [relational expression 2] 1.6 <= Cr+3Mo+2Ni <= 2, [relational expression 3] 6 <= (3C / 12+Mn / 55)*100 <= 7 (in relational expressions 1 to 3, the contents of alloying elements are based on wt%).
Description
technical field [0001] The present invention relates to a high-strength hot-rolled steel sheet excellent in elongation and a manufacturing method thereof, and more particularly, to a hot-rolled steel sheet that can be used for construction, line pipe, oil well pipe, and the like, and a manufacturing method thereof. Background technique [0002] In recent years, the environment used to develop oil and gas wells has gradually become harsher, and in order to increase profitability, efforts are being made to reduce production costs. When exploiting oil and natural gas, the steel pipes used for oil wells are used for up to 5km from the top to the bottom of the oil field. As the production depth of oil wells becomes deeper, the steel pipes used for oil well pipes need high strength, internal and external pressure crush strength, toughness, and delay resistance fracture etc. In addition, as the mining environment becomes harsher, mining costs increase rapidly, and efforts are bein...
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): C22C38/58C22C38/48C22C38/50C22C38/44C22C38/02C22C38/00C22C38/42C22C38/06C21D8/02
CPCC22C38/00C22C38/44C22C38/42C22C38/48C22C38/02C22C38/58C22C38/06C21D8/02C22C38/50C21D8/0226C21D2211/002C22C38/001C21D9/46C21D8/0263C21D2211/005C21D2211/001C21D2211/008C21D2211/009C22C38/002
Inventor 裵珒晧
Owner 浦项股份有限公司