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Method for producing low-carbon Ni-Mo alloy steel by billet caster

A billet continuous casting and alloy steel technology, which is applied in the field of steelmaking and continuous casting, can solve the problems of steel breakout, internal and surface defects, etc., and achieve the effect of reducing cooling intensity and avoiding billet cracks

Inactive Publication Date: 2017-06-13
SHOUGANG CORPORATION
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for producing low-carbon Ni-Mo alloy steel by billet continuous casting machine, which solves the problems of steel breakout and internal and surface defects in the production process

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  • Method for producing low-carbon Ni-Mo alloy steel by billet caster
  • Method for producing low-carbon Ni-Mo alloy steel by billet caster

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Embodiment 1

[0023] 1) The industrial production and supply of the low-carbon Ni-Mo alloy steel has been realized in the long steel production line of Shougang. The billet continuous casting machine is a 5-machine, 5-strand full-arc 150mm×150mm billet continuous casting machine. Base arc radius R10m. The main continuous casting process parameters in the production process are as follows: [P] in steel: 0.0130%, [S]: 0.0040%.

[0024] 1. Preparation before pouring:

[0025] (1) The baking temperature of the tundish is 1120°C;

[0026] (2) Both the ladle long nozzle and the crystallizer submerged nozzle are made of aluminum carbon nozzle;

[0027] 2. Protective casting measures:

[0028] (1) The tundish is filled with argon before pouring; the long nozzle is sealed with Ar;

[0029] (2) The tundish adopts carbon-free tundish covering agent; low-carbon steel special mold slag is used; mold mold slag is kept in "black slag" operation; mold slag is added frequently and less to ensure suffici...

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Abstract

A method for producing low-carbon Ni-Mo alloy steel by a billet caster belongs to the technical field of continuous casting in steelmaking. P in steel is controlled to < / =0.0140% with S to < / =0.0060%; temperature of molten steel in a tundish is controlled to 1540-1550 DEG C; flow of cooling water in a crystallizer is 100-150 m<3> / h; automatic water distribution is adopted for secondary cooling, under the specific water quantity of 0.8-1.2 L / kg; the crystallizer has electromagnetic stirring parameters, the frequency of 3-5 Hz and current of 250-350 A; casting speed of the billet cast is controlled to 2.3+ / -0.1 m / min, corner temperature of each blank is 900-1100 DEG C before entering a tension leveler; the blanks are cooled slowly after leaving a line. The method has the advantages that the method is reasonable and effective and basis is laid for the successful industrial production of low-carbon Ni-Mo alloy steel.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and continuous casting, in particular to a method for producing low-carbon Ni-Mo alloy steel by a billet continuous casting machine. Background technique [0002] Low-carbon Ni-Mo alloy steel alloy content reaches 3-6%. This steel type requires low welding crack sensitivity and low-temperature impact toughness requirements under large welding heat input. It needs to be strengthened mainly by alloy elements such as Ni-Mo. Means to ensure low temperature impact toughness and weldability. Crack sensitivity is high, and defects such as central cracks and shrinkage cavities are prone to occur. Alloy steel itself has a high viscosity. In order to prevent freezing flow and interruption of pouring during the casting process, it is necessary to reasonably match the superheating degree, casting speed and other processes. Since the carbon content of this steel is in the near-peritectic range, it is nec...

Claims

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Application Information

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IPC IPC(8): B22D11/00B22D11/22C22C38/08C22C38/04C22C38/12C22C38/02
CPCB22D11/001B22D11/22C22C38/02C22C38/04C22C38/08C22C38/12
Inventor 刘珂陈涛孙齐松丁宁吕迺冰佟倩徐士新
Owner SHOUGANG CORPORATION
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