TH110563B - Hot-rolled high-carbon steel plates and methods for their manufacture. - Google Patents

Abstract

This invention provides a high carbon hot rolled steel sheet. That has excellent flexural properties After stretching and how to produce that The production method of hot rolled high carbon steel sheet consists of a step of hot rolling of steel with composition, as% by mass, 0.2 to 0.7% of carbon, 2% or less of silicon, 2% or less of manganese, 0.03% or less of phosphorus, 0.03% or less of sulfur, 0.01% or less of sol. Aluminum, and 0.01% or less of nitrogen. At finishing temperature of (Ar3 - 20 ํ C) or more to form hot-rolled steel sheet, the process of cold-rolled steel sheet is cooled to a temperature of 650 ํ C or less at the heating rate. Cold at 60 ํ C / sec to less than 120 ํ C / sec, the process of coiling hot rolled steel sheet at 600 ํ C or less after cooling, and the process of hot rolled steel sheet annealing. At a baking temperature of 640 ํ C to the Ac1 transformation point.

Claims (1)

1. Production method of hot rolled high carbon steel plate, method consists of Step of rolling steel containing composition, as% by mass, 0.2 to 0.7% of carbon, 2% or less of silicon, 2% or less of manganese, 0.03% or less of phosphorus, 0.03% or Less than sulfur, 0.01% or less of sol.aluminum, and 0.01% or less of nitrogen, at finishing temperature of (Ar3 - 20 ° C), or More than to create an expander: