High-molybdenum and high-nitrogen steel and slab continuous casting process thereof
A slab continuous casting, high nitrogen steel technology, applied in the field of alloy steel and slab continuous casting technology, can solve the problems of poor alloy plasticity, easy to produce cracks, etc., achieve good center quality, inhibit the generation of depressions and cracks, improve quality effect
Inactive Publication Date: 2021-12-21
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
However, the melting point of high-molybdenum and high-nitrogen alloys is lower than 1400°C, which is about 100°C lower than that of carbon steel. This type of alloy has poor plasticity, and intermediate phases are precipitated during continuous casting and cooling, so cracks are easily generated
Method used
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Embodiment 1-8
[0081] Table 1 lists the mass percentage of each chemical element in the high-molybdenum-high-nitrogen steel of Examples 1-8.
[0082] Table 1. (wt%, the balance is Fe and other unavoidable impurities except P and S)
[0083]
[0084]
[0085] It should be noted that Re in Example 1 in Table 1 represents the mass percentage of any one or several elements of No. 57 to No. 71 in the periodic table of chemical elements.
[0086] The high molybdenum high nitrogen steel of embodiment 1-8 of the present invention all adopts following continuous casting production process to make:
[0087]In the continuous casting process, control the target casting speed of 0.6-1.6m / min within 4 minutes after the start of pouring, and operate at a constant casting speed; control the superheat of the molten steel in the tundish to 15-65°C; control the nozzle of the continuous casting mold The insertion depth is between 85 and 125mm; control the secondary cooling water to use weak cooling, and ...
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Abstract
The invention discloses high-molybdenum and high-nitrogen steel. The high-molybdenum and high-nitrogen steel comprises the following chemical elements in percentage by mass besides Fe: greater than 0 and smaller than or equal to 0.02% of C, greater than 0 and smaller than or equal to 1.0% of Si, greater than 0 and smaller than or equal to 4.0% of Mn, 18-25% of Cr, 21-28% of Ni, smaller than or equal to 1.0% of W, 4-10% of Mo and W, 0.2-1.2% of N, 0.01-4.0% of Cu and refined grain elements, wherein the refined grain elements are at least one of the following two types: (a) at least one of rare earth elements 57-71 in the periodic table of chemical elements, and the total content of the rare earth elements is 0.001-0.2%; and (b) at least one of Al, B, Ca, Mg, Nb, Ti, V, Y and Zr, wherein the total content of the at least one of Al, B, Ca, Mg, Nb, Ti, V, Y and Zr is 0.001-0.5%. Correspondingly, the invention further discloses a slab continuous casting production process of the high-molybdenum and high-nitrogen steel. The high-molybdenum and high-nitrogen steel adopts reasonable chemical components and process design and has excellent quality and performance, the percentage reduction of area at 1000-1300 DEG C is 70-85%, the tensile strength at 1000-1300 DEG C is 50-100 MPa, and the corrosion rate of the high-molybdenum and high-nitrogen steel in 38% wet-process phosphoric acid at 80 DEG C is 2-20 g / (m<2>.H).
Description
technical field [0001] The invention relates to a metal material and its slab continuous casting process, in particular to an alloy steel and its slab continuous casting process. Background technique [0002] High-nitrogen and high-molybdenum alloys contain nitrogen, molybdenum, nickel, copper and other elements, and their smelting and processing technology is relatively difficult, and segregation and cracking are easy to occur. High-nitrogen and high-molybdenum alloy is the most demanding and difficult variety of alloy steel production process, and accordingly, it is also a concentrated expression of the technical level of the steel plant. [0003] With the rapid growth of market demand in recent years, the demand for high-nitrogen and high-molybdenum alloy steel products has also increased rapidly, especially in the fields of petroleum and petrochemical, nuclear power thermal power, clean energy, shipbuilding and marine engineering, and environmental protection. , making ...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/44C22C38/58C22C38/06C22C38/54C22C38/48C22C38/50C22C38/46B22D11/16B22D11/22
CPCC22C38/04C22C38/02C22C38/004C22C38/58C22C38/44C22C38/42C22C38/001C22C38/005C22C38/002C22C38/06C22C38/54C22C38/48C22C38/50C22C38/46B22D11/16B22D11/225
Inventor 郭亮亮徐正其王迎春徐国栋
Owner BAOSHAN IRON & STEEL CO LTD