A kind of steel for prestressed concrete steel bar not easy to be brittle and its production method

A concrete steel rod and prestressing technology, applied in the field of alloy smelting, can solve the problems of stability risk, high fracture ratio, poor relaxation, etc., and achieve the effect of improving yield and production efficiency, increasing tempering temperature, and good surface quality

Active Publication Date: 2021-07-02
CHANGSHU LONGTENG SPECIAL STEEL +1
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  • Description
  • Claims
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Problems solved by technology

[0003] Traditional prestressed concrete steel rods are designed with low silicon (Si content is generally 0.70-0.90%) composition, which has a high fracture ratio and poor relaxation during use, which brings certain risks and hidden dangers to the stability of its use.

Method used

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  • A kind of steel for prestressed concrete steel bar not easy to be brittle and its production method

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preparation example Construction

[0018] The method for preparing the steel for the prestressed concrete steel bar which is not easy to break easily comprises the following steps: (a) taking molten iron and steel scrap as raw materials to carry out converter steelmaking to obtain molten steel; the tapping temperature of the molten steel is 1600-1650°C, When the molten steel is tapped, 3-5kg of lime, 10-15kg of ferrosilicon and 8-10kg of silicon-manganese are added to each ton of molten steel, and the mass percentage content of C in the molten steel is controlled to be 0.05-0.15%, and the mass percentage of P The content is 0.001-0.020% and the mass percentage content of S is 0.005-0.030%; (b) performing LF refining on the molten steel, the LF refining includes using auxiliary materials to make white slag to deoxidize the molten steel, and the amount of the auxiliary materials added Add lime 4~5kg, fluorite 2~4kg and calcium carbide grain 0.5~1.5kg for every ton of molten steel; The temperature of described molt...

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Abstract

The invention discloses a steel for prestressed concrete steel bar which is not easily brittle and a production method thereof, which comprises the following chemical components in mass percentage: C: 0.25-0.35%, Si: 1.10-1.40%, Mn: 0.55-0.75% , P: ≤0.025% and S: ≤0.010%, the balance being Fe and unavoidable impurities. This method can ensure that the material gas, inclusions, mechanical properties, etc. meet the material requirements, meet the requirements of wire rod processing steel rods, increase the heat treatment tempering temperature without reducing the strength of the steel rods, and greatly reduce the fracture ratio of prestressed concrete steel rods , improve the finished product rate and production efficiency, and save energy and user production costs.

Description

technical field [0001] The invention belongs to the field of alloy smelting, and relates to a steel for prestressed concrete steel rods, in particular to a steel for prestressed concrete steel rods which is not easily brittle and a production method thereof. Background technique [0002] The steel types for prestressed concrete steel bars are generally high silicon steel (Si>1.40%) and low silicon steel (Si: 0.70~1.10%); it has high strength toughness, low relaxation, strong grip with concrete, Good weldability, upsetting, material saving (such as Steel rods can be substituted Hot-rolled steel bars) and other characteristics have been widely used in high-strength prestressed concrete centrifugal pipe piles, poles, viaduct piers, railway sleepers and other prestressed components abroad, and have a very broad market in the world, especially in Asia. [0003] The traditional prestressed concrete steel bar is designed with low silicon (Si content is generally 0.70-0.90%) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C21C7/00C21C7/06C21C7/072C22C33/06
CPCC21C7/0006C21C7/0056C21C7/06C21C7/072C22C33/06C22C38/02C22C38/04Y02P10/20
Inventor 刘荣泉丁振涛范耀东沈克李鹏耿振杰朱春乐诸葛宇明
Owner CHANGSHU LONGTENG SPECIAL STEEL
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