A high-strength engineering steel plate with a length ≥ 30m and its production method

Abstract

A high-strength engineering steel plate with the length of larger than or equal to 30 m comprises the components in percentage by weight as follows: 0.07%-0.11% of C, 0.25%-0.50% of Si, 1.30%-1.50% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.010% of S, 0.05%-0.08% of Nb and Ti, 0.0007%-0.0020% of B and 0.015-0.05% of Als. The production steps are as follows: smelting and continuous casting are performed, so that a blank is formed; the casted blank is heated; rolling is performed with a TMCP (thermo mechanical control process); the plated is cooled in four sections; the plate is strengthened; the plate is air-cooled to a room temperature; and tempering is performed. According to the plate and a production method, the TMCP and tempering production are used, so that the problem that the quality of a steel plate with the thickens of 10-20 mm, the product length of larger than or equal to 30 m and the single plate weight of 8-12 t is instable is solved; and compared with steel with the same yield strength grade at home and abroad, impact power at the temperature of subzero 40 DEG C is larger than or equal to 200 J, the plate is applicable to manufacture of large steel mechanical equipment working in an extremely cold environment, and the production cost is decreased due to the fact that precious alloys are greatly reduced.

Description

technical field [0001] The invention relates to engineering steel and a production method thereof, in particular to a high-strength engineering steel plate with a length ≥ 30m and a production method thereof. Background technique [0002] With the rapid development of my country's economy, construction machinery is becoming larger and lighter, and the demand for construction machinery steel plates is increasing. Due to the complex service conditions and complex stress of construction machinery, the steel plates used are required to have high strength and high toughness. For construction machinery used in extremely cold climates, high low-temperature impact toughness is also required. At present, the high-strength Q460~Q690 has been widely used in mining machinery, construction machinery, port machinery and other fields. In the current production of high-strength single steel plate, it has been implemented by TMCP process to replace the traditional quenching and tempering pro...

AI Technical Summary

Problems solved by technology

Its disadvantages are: the addition of precious alloys Ni, Cu, Cr, etc. increases the production cost, and the length of the produced steel plate does not exceed 20m

Its disadvantages are: the addition of precious alloys Mo, Cu, Cr, etc. increases the production cost, and the length of the produced steel plate does not exceed 20m

Its disadvantages are: the addition of precious alloys Mo, Cr, etc. increases the production cost, and the length of the produced steel plate does not exceed 20m

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