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Casting method of martensite precipitation hardened stainless steel

A casting method and precipitation hardening technology, which is applied in the casting field of martensitic precipitation hardening stainless steel, can solve the problems of not being able to obtain high-quality martensitic precipitation hardening steel, low cost, and low yield of metal produced

Active Publication Date: 2020-07-07
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the content of copper and molybdenum in martensitic precipitation hardening steel is very high, which leads to strong crack sensitivity of this type of steel. At present, die casting is generally used to realize the production, but the metal yield of die casting process is low, and the production cost is high. Unstable internal quality
[0005] Overall, there is currently no low-cost, high-efficiency casting method for obtaining high-quality martensitic precipitation-hardening steels

Method used

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  • Casting method of martensite precipitation hardened stainless steel
  • Casting method of martensite precipitation hardened stainless steel
  • Casting method of martensite precipitation hardened stainless steel

Examples

Experimental program
Comparison scheme
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Embodiment

[0054] The present invention is further illustrated below by means of examples, but the present invention is not limited to the scope of the examples. For the experimental methods that do not specify specific conditions in the following examples, select according to conventional methods and conditions, or according to the product instructions.

[0055] The specific parameters of the straight arc slab caster adopted in each of the following embodiments are as follows:

[0056]

[0057]

[0058] The secondary cooling water in the secondary cooling zone in each of the following embodiments adopts the following configuration:

[0059]

[0060]

[0061] The parameter of the mold flux that adopts in following each embodiment is as follows: (weight %)

[0062]

[0063] The relevant parameter of crystallizer in following each embodiment is as follows:

[0064] The water flow rate of the wide surface is 2700L / min, and that of the narrow surface is 500L / min.

[0065] T...

example 1

[0068] In June 2018, the applicant company produced martensitic precipitation-hardened stainless steel slabs (secret experiment) on a straight-arc slab continuous casting machine, producing 1 heat of steel with a slab size of 200×1240×Lmm. The process is as follows:

[0069] ①Molten steel composition

[0070] The actual composition of the molten steel is as follows, which meets the composition requirements of the national standard for steel grades.

[0071] element C Si mn P S Cr Ni Mo Cu Nb Fe actual value 0.042 0.38 0.51 0.016 0.0011 13.82 5.36 1.39 1.37 0.29 remaining

[0072] ②Process temperature and casting speed control

[0073] Tunnel temperature 1 Tunnel temperature 2 Tunnel temperature 3 Tunnel temperature 4 Tunnel temperature 5 pulling speed 1508 1505 1506 1502 1502 0.75

[0074] ③Using special mold slag, the process slag condition is normal, the consumption is 0.52kg / ton of steel, t...

example 2

[0079] The applicant company produced martensitic precipitation-hardening stainless steel slabs (secret experiment) on a straight-arc slab continuous casting machine in April 2019. This time, it produced 2 continuous furnaces, and the slab size was 200×1240×Lmm. The process is as follows:

[0080] ①Molten steel composition

[0081] The actual composition of the two furnaces of molten steel is as follows, which meets the composition requirements of the national standard for steel grades.

[0082] element C Si mn P S Cr Ni Mo Cu Nb Fe Heat 1 0.042 0.38 0.51 0.016 0.0011 13.82 5.36 1.39 1.37 0.29 remaining Heat 2 0.038 0.41 0.53 0.015 0.001 13.76 5.32 1.41 1.36 0.30 remaining

[0083] ②Process temperature and casting speed control

[0084] index Tunnel temperature 1 Tunnel temperature 2 Tunnel temperature 3 Tunnel temperature 4 Tunnel temperature 5 pulling speed Heat 1 1509 1507 1507...

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Abstract

The invention provides a casting method of martensite precipitation hardened stainless steel. The casting method is carried out in a straight-arc slab continuous casting machine, and comprises the following steps that (1) molten steel in a tundish enters a crystallizer through a submerged water nozzle, protective slag is added onto the surface of the molten steel to prevent secondary oxidation, primary cooling of the molten steel is completed under the action of crystallizer cooling water, and meanwhile, the casting machine is started for straightening, and a blank shell is operated in the casting machine at a certain drawing speed under the action of pulling and straightening force; and (2) the blank shell obtained after primary cooling enters a secondary cooling area for secondary cooling. Compared with traditional die casting, the method has the advantages of high metal yield, low production cost and high production efficiency.

Description

technical field [0001] The invention relates to the technical field of stainless steel smelting, in particular, the invention relates to a casting method of martensitic precipitation hardening stainless steel. Background technique [0002] Martensitic precipitation hardening stainless steel has good strength and toughness, and its corrosion resistance in the atmosphere and weak corrosive medium is better than that of ferritic steel and martensitic steel. It can withstand a certain degree of cold working and is relatively easy to weld. Precipitation hardening stainless steel The largest amount of application. [0003] During the casting process, the cooling rate has a direct impact on the toughness of the martensitic precipitation hardening steel, and slow cooling will cause carbides and nitrides to segregate along the grain boundaries. The solidification segregation of δ ferrite in steel grades during solidification will cause uneven plasticity and toughness, so it is neces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/043B22D11/111B22D11/22C22C38/02C22C38/04C22C38/42C22C38/44C22C38/48
CPCB22D11/043B22D11/111B22D11/225C22C38/02C22C38/04C22C38/002C22C38/44C22C38/42C22C38/48
Inventor 王伟任选常国栋李晓军
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD