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

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%.

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...

AI Technical Summary

Problems solved by technology

The steel plate composition design and manufacturing process involved in the patent cannot guarantee the performance of the steel plate after strain, and cannot be applied to the manufacture of pressure pipes for hydropower stations

In addition, the patent is obviously different from the rolling process parameters described in this patent

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