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Low-temperature heating oriented electrical steel with good surface coating and production method thereof

A kind of oriented electrical steel, good technology, applied in the direction of temperature control, etc., can solve the problems of billet burning, high heating temperature, high energy consumption, etc., achieve the effects of eliminating magnetic aging, simplifying the process flow, and improving production efficiency

Inactive Publication Date: 2011-07-20
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the traditional grain-oriented electrical steel production method, the electrical steel uses Al, Mn, N, S, Se, etc. as inhibitor elements. In order to make them play a role and ensure stable high magnetic properties, these inhibitors must be made completely before hot rolling. Solid solution, so it is necessary to heat the slab to a high temperature of 1350-1450°C. Due to the high heating temperature, the slab is severely burned, the energy consumption is high, and the yield is low.

Method used

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  • Low-temperature heating oriented electrical steel with good surface coating and production method thereof
  • Low-temperature heating oriented electrical steel with good surface coating and production method thereof
  • Low-temperature heating oriented electrical steel with good surface coating and production method thereof

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Embodiment 1

[0028] Embodiment 1: use 25kg vacuum furnace to make steel, the chemical composition is as shown in Table 1, and the rest is iron and unavoidable impurities. The slab was heated at 1250°C for 2.5h and then hot rolled to 2.3mm. After the first cold rolling, the strip steel is subjected to intermediate annealing, and the process system is wet H 2 and N 2 Incubate at 840°C for 5 minutes under the mixed gas, where H 2The content volume percentage is 15%. The second cold rolling to the thickness of the finished product is 0.285mm, and then recovery annealing is carried out to improve the surface quality of the strip. The annealing system is wet H 2 and N 2 Under the mixed gas of 550 and 650°C for 1.5min, the MgO spacer is coated and then high-temperature annealing is carried out, in which the temperature is raised at a rate of 50°C / h in the stage of 400-700°C.

[0029] Comparative example for intermediate annealing in H 2 and N 2 Incubate at 920°C for 5 minutes under the mix...

Embodiment 2

[0035] Embodiment 2: use 25kg vacuum furnace to make steel, the chemical composition is as shown in Table 3, and the rest is iron and unavoidable impurities. The slab was heated at 1150°C for 2.5h and then hot rolled to 2.2mm. After the first cold rolling, the strip steel is subjected to intermediate annealing, and the process system is wet H 2 and N 2 Incubate at 840°C for 5 minutes under the mixed gas, where H 2 The content volume percentage is 15%. The second cold rolling to the thickness of the finished product is 0.285mm, and then recovery annealing is carried out to improve the surface quality of the strip. The annealing system is wet H 2 and N 2 Under the mixed gas of 550 and 650°C for 1.5min, the MgO spacer is coated and then high-temperature annealing is carried out, in which the temperature is raised at a rate of 50°C / h in the stage of 400-700°C.

[0036] Comparative example for intermediate annealing in wet H 2 and N 2 Incubate at 840°C for 7 minutes under th...

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Abstract

The invention relates to a low-temperature heating oriented electrical steel with good surface coating and a production method thereof, belonging to the technical field of oriented electrical steels. A casting blank comprises the following components: 0.005-0.08wt% of C, 2.5-6.5wt% of Si, 0.005-0.03wt% of Als, 0.001-0.4wt% of Mn, 0.01-0.3wt% of Cu, 0.003-0.010wt% of N, 0.001-0.03wt% of S, 0.01-0.3wt% of Sn, 0.001-0.1wt% of Cr, less than or equal to 0.02wt% of P and the balance of Fe and inevitable impurities. The casting blank is heated to 1150-1300 DEG C and then is subjected to hot rolling, a hot rolled plate is subjected to acid pickling, two-step cold rolling containing intermediate annealing is carried out until the thickness of a finished product is achieved, the intermediate annealing is carried out at the temperature of 750-850 DEG C, the heat preservation is carried out 3-6 minutes, and the furnace atmosphere is mixed gas of wet H2 and N2. The invention has the advantages that an auxiliary inhibitor is added, the intermediate annealing process is improved, and the short-time low temperature recovery annealing is carried out after cold rolling, thus the intermediate full-decarbonizing annealing time is reduced, the production efficiency is improved, and the quality of the surface coating is improved.

Description

technical field [0001] The invention relates to the technical field of oriented electrical steel production, and in particular provides a low-temperature heating oriented electrical steel with good surface coating and a production method, which have good surface coating quality and magnetic properties, and are low in cost. Background technique [0002] Grain-oriented electrical steel is mainly used as the core material of transformers and other electrical appliances. 800 Indicates) high and iron loss (50Hz AC iron loss under the maximum magnetic flux density of 1.7T, use P 17 Indicates) and magnetostriction is small. Especially in recent years, from the perspective of energy saving and resource saving, the requirements for the magnetic properties of grain-oriented electrical steel are higher. [0003] In order to obtain a grain-oriented electrical steel sheet with excellent magnetic properties, it is very necessary to form a high-density agglomerated Goss texture through s...

Claims

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Application Information

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IPC IPC(8): C22C38/34C21D8/12B21B37/74C21D1/26
Inventor 夏兆所潘丽梅许学勇周谊军王全礼董浩赵楠冯莉莉杜守志耿立王崇学
Owner SHOUGANG CORPORATION
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