Normalized delivery FH36 steel plate being100-120 mm thick and used for offshore wind power pipe pile and manufacturing method of steel plate

Abstract

The invention relates to a normalized delivery FH36 steel plate being 100-120 mm thick and used for an offshore wind power pipe pile. Chemical components based on the national standard GB712 and classification society specifications comprise, by weight percentage, 0.11-0.13% of C, 0.15-0.50% of Si, 1.20-1.60% of Mn, smaller than or equal to 0.0070% of P, smaller than or equal to 0.0030% of S, 0.030-0.060% of Nb, 0.020-0.050% of Al, 0.008-0.030% of Ti, 0.40-0.80% of Ni, 0.10-0.20% of Cr, 0.10-0.35% of Cu, 0.0005-0.0050% of Ca, and the balance Fe. The carbon equivalent CEV is smaller than or equal to 0.49%. Proeutectoid ferrite and needle-shaped ferrite are adopted as a matrix structure. The average crystal grain size is 6-15 micrometers. Due to center segregation of a continuous cast blank,a small amount of strip pearlite is possibly generated on a core portion of the steel plate. The manufacturing flow of the steel plate comprises the steps of converter treatment, LF refining, RH vacuum degassing, Ca treatment, continuous casting, cast blank dehydrogenation treatment, heating, rolling and normalizing.

Description

technical field [0001] The invention belongs to the field of alloy iron and steel metallurgy, and specifically relates to an FH36 steel plate for extra-thick offshore wind power pipe piles delivered in a normalized state and a production method thereof. Background technique [0002] Offshore wind power has sprung up suddenly, and the installed capacity has grown rapidly year after year, especially in the coastlines of Jiangsu, Fujian, Guangdong, Shandong and other provinces in my country. The development of the offshore wind power industry has led to the rapid development of the technology of offshore wind turbines and their supporting materials. The installation of wind turbines has gradually extended from offshore to shallow seas and to cold areas. At present, the northernmost offshore wind turbine in China has been installed in Zhuanghe, Dalian, Liaoning. With the development of larger capacity, the steel for offshore wind power is also developing from the commonly used D...

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Problems solved by technology

[0004] For the FH36 marine engineering steel plate delivered in a high-standard normalized state, the domestic production technology reserves are insufficient. The patent documents retrieved by the inventor of this case only involve the application of FH36 steel on LPG and LEG ships, and the thickness is less than 40mm. Introduction to the production of extra-thick FH36 steel plates for offshore wind power pipe piles

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