Method for improving tundish sampling success rate

Abstract

The invention belongs to the technical field of steel smelting, and particularly relates to a method for improving the sampling success rate of a tundish. Comprising the following steps: (1) arranging a bend at the middle position of a sampler according to the normal working liquid level of the tundish, and welding a limiting rod above the bend; (2) welding a balancing weight at the front end of the sampler; (3) sampling at a fixed time point, and not sampling within the time of adding the covering agent or carbonizing the rice husks; (4) controlling the sampler to stay in the molten steel for 5 seconds; (5) a sampling hole is formed in the position, away from the stopper rod hole and the feeding hole, of the ladle cover; (6) immediately weighing after sampling, wherein the weight of the sample is 1t; and carrying out secondary sampling when the weight is 90g. The problems existing in current molten steel sampling are improved in a targeted mode, and therefore the sampling success rate is increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of iron and steel smelting, and particularly relates to a method for improving the success rate of tundish sampling. Background Art

[0002] With the increasing maturity of the technology in the iron and steel industry, the production rhythm of each iron and steel unit has significantly accelerated. Among them, in the continuous casting process of the steelmaking plant, tundish sampling is one of the key operations in the continuous casting process. The product components of the vast majority of iron and steel enterprises are based on the components of tundish sampling as the final result. Therefore, the qualified rate of tundish sampling has a great impact on the production rhythm. If the sampling is unsuccessful and no effective components can be obtained after sample processing, it will greatly affect the efficiency of casting billet feeding and rolling. Moreover, secondary sampling will increase the production cost of the enterprise. Sometimes, the pouring cycle can no longer meet the requirements of secondary sampling, and only the corner sample can be cut after the casting billet is taken offline for re-inspection, which further increases the production cost. And the offline of the casting billet will further affect the operation, transportation, and storage costs. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for improving the success rate of tundish sampling to solve the problems existing in the prior art.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0005] A method for improving the success rate of tundish sampling includes the following steps:

[0006] (1) According to the normal working liquid level of the tundish, a bend is set at the middle position of the sampler, and a limiting rod is welded above the bend;

[0007] (2) A counterweight is welded at the front end of the sampler;

[0008] (3) Sampling is carried out at fixed time points, and sampling is not carried out during the time of adding covering agent or carbonized rice husk;

[0009] (4) Control the sampler to stay in the molten steel for 5 seconds;

[0010] (5) Set the sampling hole at a position on the ladle cover far from the stopper rod hole and the feeding hole;

[0011] (6) Weigh immediately after sampling, and conduct secondary sampling when the sample weight is < 90g.

[0012] The present invention has the following beneficial effects:

[0013] 1. The present invention makes targeted improvements to the existing problems in the current molten steel sampling, thereby improving the sampling success rate.

[0014] 2. By inserting the front end of the sampler into the molten steel in a fixed posture, it ensures full sampling of the molten steel and improves the reliability of the sample.

[0015] 3. Add counterweights to prevent the front end of the sampler from being difficult to insert into the molten steel due to the high density of the molten steel.

[0016] 4. Fix the sampling time point and residence time to further improve the reliability of the sample.

[0017] 5. Avoid sampling when adding covering agent or carbonized rice husk, and adjust the position of the sampling hole to prevent the sample from being contaminated or affected.

[0018] 6. Weigh each sample to ensure full sampling. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the sampler of the present invention.

[0020] Figure 2 It is a schematic diagram of the position of the sampling hole of the present invention.

[0021] Wherein: 1. Sampler; 2. Bend; 3. Limit rod; 4. Counterweight; 5. Sampling hole; 6. Stopper rod hole; 7. Feeding hole; 8. Ladle cover. Detailed Embodiments

[0022] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] As Figure 1-2 shown, a method for improving the sampling success rate of the tundish includes the following steps:

[0024] (1) According to the normal working liquid level of the tundish, set a bend at the middle position of the sampler, and weld a limit rod above the bend.

[0025] When sampling, insert the sampler through the sampling hole, and the limit rod is horizontally supported on the sampling hole, so that the front end of the sampler is inserted into the molten steel in a fixed posture, ensuring full sampling of the molten steel.

[0026] (2) Weld a counterweight at the front end of the sampler. The added counterweight prevents the front end of the sampler from being difficult to insert into the molten steel due to the high density of the molten steel.

[0027] (3) Sample at a fixed time point and do not sample during the time of adding the covering agent or carbonized rice husk. Prevent sampling contamination caused by the covering agent, carbonized rice husk, etc.

[0028] (4) Control the sampler to stay in the molten steel for 5 seconds to ensure full sampling.

[0029] (5) The sampling hole is arranged at a position on the ladle cover far from the stopper hole and the charging hole, which can not only avoid the influence of the flow field around the stopper, but also prevent the influence of the newly added materials on sampling.

[0030] (6) Weigh immediately after sampling. When the weight of the sample is < 90 g, secondary sampling is carried out. When the weight of the sample is < 90 g, it indicates that the sampling is not full, that is, the sample is unqualified, and secondary sampling is carried out until the weight of the sample ≥ 90 g, so as to effectively avoid the corner cutting of the continuous casting billet due to untimely secondary sampling.

[0031] The above embodiments only describe the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope of the present invention.

[0032] The technologies, shapes and structures not described in detail in the present invention are all well-known technologies.

Claims

1. A method for improving the success rate of tundish sampling, characterized in that, The steps include the following: (1) Set a bend at the middle position of the sampler according to the normal working liquid level of the tundish, and weld a limit rod above the bend; (2) Weld a counterweight at the front end of the sampler; (3) Take samples at fixed time points and do not take samples during the time of adding flux or carbonized rice husk; (4) Control the sampler to stay in the molten steel for 5 seconds; (5) Set the sampling hole at a position on the ladle cover far from the stopper rod hole and the feeding hole; (6) Weigh immediately after sampling, and take a second sample when the weight of the sample is < 90g.

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