High-strength steel plate for 800MPa hydropower station pressure pipeline and production method thereof

A technology for pressure pipelines and high-strength steel plates, which is applied to high-strength steel plates for 800MPa hydropower station pressure pipelines and the production field, can solve the problems of different rolling process parameters, cannot be used in the manufacture of hydropower station pressure pipelines, and cannot guarantee the performance of steel plates, and achieves good uniformity. , The effect of reducing construction costs and reducing welding difficulty

CN103290339BActive Publication Date: 2015-05-27SHOUGANG CORPORATION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-05-27

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Abstract

The invention provides a high-strength steel plate for an 800MPa hydropower station pressure pipeline and a production method thereof, and belongs to the technical field of steel for hydropower stations. The steel is composed of the following chemical ingredients in percentage by weight: 0.08-0.10% of C, not larger than 0.25% of Si, 1.2-1.6% Mn, not larger than 0.013% of P, not larger than 0.02% of S, 0.01-0.03% of Nb, not larger than 0.03% of V, 0.01-0.02% of Ti, 0.15-0.50% of Ni, 0.20-0.60% of Cr, 0.05-0.30% of Mo, 0.0010-0.0015% of B and the balance of Fe and inevitable impurities. Since element ingredients are reasonably combined and designed and corresponding rolling and heat treatment techniques are matched, the steel plate has excellent welding adaptability while having excellent strength, plasticity and low-temperature impact toughness, and the welding cold cracking sensitivity index Pcm is not larger than 0.22%.
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Description

technical field

[0001] The invention belongs to the technical field of steel for hydropower stations, and in particular relates to a high-strength steel plate for pressure pipes of 800MPa hydropower stations and a production method. Background technique

[0002] During the construction and development of hydropower stations, with the development of units towards high parameters and large capacity, the diameter of pressure steel pipes in hydropower stations is becoming larger and larger. At present, the steel plates commonly used in hydropower stations are 610MPa grades, and it is necessary to ensure the impact toughness of steel plates at -20°C~-40°C. And has good welding adaptability. As the water head of the newly designed hydropower station continues to increase, the design diameter and pressure of the penstock steel pipe continue to increase. Without increasing the strength grade of the steel pipe, the thickness of the steel plate needs to be increased to meet the design...

Examples

Embodiment Construction

[0045] Examples of adjusted steel plates with a thickness specification ≤ 60mm produced according to the production method of the present invention are shown in the following tables.

[0046] Table 1 is the composition of the examples of the present invention, Table 2 is the rolling process of the examples of the present invention, Table 3 is the heat treatment process of the examples, and Table 4 is the mechanical properties of the examples. As can be seen from the table, the manufacturing method of the present invention can produce quenched and tempered steel plates for 800MPa grade hydropower station pressure pipes with performance temperature, yield strength ≥ 690MPa, tensile strength ≥ 780MPa, elongation ≥ 16%, and -40 ℃ impact toughness value single Value ≥ 130J.