780MPa-grade forming-enhanced hot-dip galvanized dual-phase steel and manufacturing method thereof
A dual-phase steel and hot-dip galvanizing technology, which is applied in the hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems of fine-grain strengthening of the steel plate matrix, high phosphorus removal equipment, and surface color difference defects of galvanized products and other problems, to achieve the effect of high plastic hole expansion performance and high hole expansion performance
Pending Publication Date: 2022-05-24
HANDAN IRON & STEEL GROUP +1
View PDF11 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0006] The patent application with the publication number CN 106119716 A discloses a plastically enhanced cold-rolled hot-dip galvanized dual-phase steel and its production method. Its main chemical components are: C: 0.12%-0.18%, Si: 0.3%-0.6% , Mn: 1.3%~2.3%, Al: 0.4%~0.9%, P≤0.01%, S≤0.01%; it reduces the cost without adding alloy elements, and generates TRIP effect by introducing a certain amount of residual austenite , which improves the elongation of the two-phase; but the Si content in this application is as high as 0.3~0.6%, and the higher Si content will cause the ferrous silicate produced in the hot rolling process of the product, the red rust is serious, and a higher phosphorus removal is required Equipment and pressure require high equipment capacity, otherwise, once the iron oxide scale is not completely removed, it will cause serious color difference defects on the surface of the galvanized finished product
At the same time, no alloying elements are added in the application for the invention, which cannot strengthen the steel plate matrix by fine-grain strengthening, and higher carbon and manganese elements will reduce the plasticity of the steel plate
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
[0054] The metallographic structure of the high-surface dual-phase steel prepared in Example 1 is shown in figure 1 , Determination of retained austenite content by electron backscatter diffraction (EBSD) Metallographic diagram, see figure 2 , the content of retained austenite in the structure can be calculated to be about 6% to 8% using statistical software. The surface of the finished product in Example 1 is as follows: image 3 As shown, it can be seen that the surface quality is good, and there is no color difference, landscape painting, and selective oxidative leakage plating defects.
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 |
|---|---|---|
| elongation | aaaaa | aaaaa |
| elongation | aaaaa | aaaaa |
Login to View More
Abstract
The invention provides 780MPa-grade forming-enhanced hot-dip galvanized dual-phase steel and a preparation method thereof. The dual-phase steel comprises the following chemical components in percentage by mass: 0.14%-0.18% of C, 0.15%-0.30% of Si, 2.0%-2.3% of Mn, 0.5%-0.7% of Al, less than or equal to 0.015% of P, 0.02%-0.03% of Nb, 0.015%-0.025% of Ti, 0.1%-0.4% of Cr, 0.007%-0.0015% of B and the balance of Fe and inevitable impurity elements. The production method comprises the procedures of converter smelting, hot rolling, acid pickling and cold rolling, annealing and hot galvanizing, in the hot rolling procedure, the slab heating temperature is controlled to be 1180-1210 DEG C, the heating time is 180-220 min, and the hot rolling coiling temperature is 500-550 DEG C. The dual-phase steel provided by the invention has relatively high surface quality.
Description
technical field [0001] The invention belongs to the field of manufacturing high-strength steel for automobiles, and relates to a 780MPa-level enhanced formability hot-dip galvanized dual-phase steel and a manufacturing method thereof. Background technique [0002] As customers have higher and higher requirements for the formability of hot-dip galvanized dual-phase steel, enhanced formability hot-dip galvanized dual-phase steel is more and more favored by customers. [0003] However, the current enhanced formability dual-phase steel meets the high performance, and the surface quality problem is gradually paid attention by customers. Due to the large number of alloying elements in steel, especially Si and Mn elements, surface quality problems such as missing plating and pitting are prone to occur during the coating process, which in turn affects the quality of the finished product. [0004] The patent application with publication number CN 111893379 A discloses a 780MPa grade...
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 & AuthorityApplications(China)
IPC IPC(8): C22C38/02C22C38/06C22C38/26C22C38/28C22C38/32C22C38/38C23C2/06C23C2/40C21D1/26C21D6/00C21D8/02C22C33/04
CPCC22C38/02C22C38/38C22C38/06C22C38/26C22C38/28C22C38/32C22C33/04C21D1/26C21D8/0205C21D8/0226C21D8/0236C21D8/0247C21D6/002C21D6/005C21D6/008C23C2/06C23C2/40C21D2211/001C21D2211/002
Inventor宋志超张才华韩健于晓飞武智猛张玉杰翟景阳韩雄超
OwnerHANDAN IRON & STEEL GROUP