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Method for heating Ni-containing steel and removing iron oxide scales

An iron oxide scale and heating furnace technology, which is applied in heat treatment furnaces, heat treatment equipment, heat treatment process control and other directions, can solve the problems of excessive scale, high viscosity, and difficult removal of high-pressure water, so as to ensure the surface quality and reduce the waste judgment rate. Effect

Active Publication Date: 2014-02-26
INNER MONGOLIA BAOTOU STEEL UNION
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AI Technical Summary

Problems solved by technology

By optimizing the heating process system, the problems of Ni-containing steel billet with many oxide scales, high viscosity, and difficult removal by high-pressure water are effectively solved, thereby ensuring the surface quality of the finished steel plate

Method used

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Embodiment 1

[0032] The material of the slab is container steel plate, the chemical composition is C: 0.15%, Si: 0.30%, Mn: 1.49%, P: 0.014%, S: 0.002%, Ni: 0.90%, Cr: 0.29%, Mo: 0.28%, Nb: 0.014%, V: 0.04%, Ti: 0.009%. It belongs to the steel type with high Ni content. It is heated by a walking beam heating furnace, the thickness of the slab is 250mm, the way of entering the furnace is cold charging, and a weak oxidizing atmosphere (mixed atmosphere of blast furnace gas, coke oven gas and air) is used, and the ratio of blast furnace gas and coke oven gas is 1: 1. The excess air ratio is 1.05:1.1, and the furnace pressure is controlled at 0-15Pa by adopting slight positive pressure. The temperature at the end of the preheating stage is 550°C, the temperature at the end of the first heating stage is 1120°C, the heating time is 100 minutes, the gas hand valve of the burner is opened 50%, the air hand valve is opened 100%, and the flame of the flame adjustment burner is a long flame. The en...

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Abstract

The invention relates to a method for heating Ni-containing steel and removing iron oxide scales. A steel blank comprises, by weight, less than or equal to 0.15% of C, 0.15-0.50% of Si, 1.20-1.60% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.60-1.00% of Ni, 0.2-0.4% of Cr, 0.2-0.4% of Mo and 0.005-0.020% of Nb. The heating process of the method comprises a pre-heating stage, a primary heating stage, a secondary heating stage and a soaking stage. The method is characterized in that micro-positive pressure and a weak oxidization atmosphere are adopted. The method solves the problems that the Ni-containing steel blank has more iron oxide scales and large viscosity and high pressure water is removed difficultly, so that surface quality of the finished steel plate is guaranteed and a waste ratio is reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and particularly provides a method for heating Ni-containing steel and removing scale. Background technique [0002] Oxidized iron scale is an unavoidable product produced during the high-temperature heating process of the steel billet. If the removal effect is not good, it will cause surface quality problems such as pressed iron skin, surface red rust, banded "pockmarks" and "pockmarked surface" of the finished product, which seriously hinders the product quality. The improvement of grades even produces quality objections, which bring economic losses to steel enterprises. Therefore, the scale problem has been perplexing various manufacturers, and there is no thorough solution at present. [0003] Studies have shown that the chemical composition has a great influence on the generation of iron oxide scale. At high temperature, Ni reacts with S in the furnace gas to form a NiS network structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/48C21D6/00C21D9/70C21D11/00
Inventor 杨雄黄利王海明
Owner INNER MONGOLIA BAOTOU STEEL UNION
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