A method of feeding stainless steel cored wire to the crystallizer to improve the solidification quality of the slab
A technology of cored wire and crystallizer, which is applied in the field of feeding stainless steel cored wire to the mold to improve the solidification quality of the slab, and can solve the problems of slow melting speed of the cored wire, limitation of the feeding amount of the cored wire, and small specific surface area of the cored wire To avoid problems such as billet structure and composition asymmetry, improve quality, and flexibly feed wires
Active Publication Date: 2021-07-09
NORTHEASTERN UNIV LIAONING +1
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Problems solved by technology
However, the traditional wire feeding process is mainly used to add deoxidizers and microalloying elements, the feeding amount is severely limited, and the effect of absorbing the superheat of molten steel is very limited
The specific surface area of the cored wire with a circular cross section is small, and the melting speed of the cored wire is slow, which also severely limits the feeding amount of the cored wire; moreover, the cored wire with a circular cross section is easily deflected by the impact of molten steel , resulting in asymmetry of the billet structure and unsatisfactory wire feeding effect
Method used
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Embodiment
[0066] Thoroughly and evenly mix the three kinds of powders of iron boron, rare earth magnesium alloy and rare earth to prepare the alloy powder with the composition shown in Table 1;
[0067] The alloy powder is used as the inner core, and a 904L stainless steel sheath is wrapped on the outside to prepare a cored wire with an oval cross-section, and the cored wire is crimped into a cored wire roll by a coiler; wherein, the thickness of the 904L stainless steel sheath is , the length of the major semi-axis of the cross-section of the cored wire a, the length of the minor semi-axis b and the density of the cored wire are shown in Table 1;
[0068] Prepare 1#~14# super austenitic stainless steel continuous casting slabs on a continuous casting machine with a crystallizer size of 1800mm×220mm. The specific preparation method is as follows: figure 1 , Figure 2a and Figure 2b As shown, the cored wire reel is installed on the wire feeding reel 1 of the wire feeding system, and t...
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Abstract
The invention provides a method for improving the solidification quality of a slab by feeding a stainless steel cored wire to a crystallizer, and relates to the technical field of super austenitic stainless steel continuous casting production. The invention uses alloy powder containing boron, magnesium and rare earth elements as the inner core, and wraps super austenitic stainless steel sheath on the outside to prepare a cored wire with an oval cross-section. The input ratio and feeding speed can effectively improve the purity of the slab, refine the solidification structure and increase the proportion of equiaxed grains, reduce the segregation and precipitation of central elements, and improve the high-temperature thermoplasticity and high-temperature oxidation resistance of the slab.
Description
technical field [0001] The invention relates to the technical field of super austenitic stainless steel continuous casting production, in particular to a method for feeding a stainless steel cored wire to a crystallizer to improve the solidification quality of a slab. Background technique [0002] Super austenitic stainless steel is a type of stainless steel that requires the highest preparation technology and is the most difficult to manufacture, and there are many bottlenecks in the preparation process. In the smelting process, if the content of oxygen and sulfur is not properly controlled, plastic inclusions such as MnS and Al 2 o 3 Such brittle inclusions seriously deteriorate the hot workability, corrosion resistance and mechanical properties. During the solidification process of continuous casting, as high as 6-8% Mo, the segregation and precipitation of Mo element in the center of the slab is very serious, which deteriorates the hot workability of the slab. In orde...
Claims
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IPC IPC(8): B22D11/11C21C7/00C22C28/00C22C30/00C22C38/02C22C38/04C22C38/42C22C38/44C22C38/54C22C38/58
CPCB22D11/11C21C7/0006C21C7/0056C22C28/00C22C30/00C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/42C22C38/44C22C38/54C22C38/58
Inventor 李花兵张树才耿一峰姜周华冯浩朱红春
Owner NORTHEASTERN UNIV LIAONING