Test method of oxidation burning loss rate of billet steel processed by steel rolling heating furnace

Abstract

The invention discloses a test method of oxidation burning loss rate of a billet steel processed by a steel rolling heating furnace. The method comprises the following steps: 1) weighing a steel sample, and recording mass of the steel sample; 2) placing the steel sample in a test module, integrally placing the test module and the steel sample on an upper surface of the billet steel which is goingto be placed in the furnace for being heated; 3) placing the test module and the steel sample into the furnace with the billet steel, after being heated step by step in the heating furnace, taking outthe test module and the steel sample with the billet steel, placing the steel sample in water for cooling, cooling to normal temperature and then taking out the steel sample, wiping up iron scales onthe surface; 4) drying the iron scales wiped up, weighing the dried steel sample, and recording the mass of the steel sample; 5) calculating the oxidation burning loss rate of the steel sample according to change of mass of the steel sample before and after being placed in the heating furnace. The test method of oxidation burning loss rate of the billet steel, provided by the invention, is simpleand easy to carry out and can test the oxidation burning loss rate of steels of different types; the module can be used repeatedly for many times; and a simple and effective method for actual measurement of data of oxidation burning loss of the billet steel is provided.

Description

Technical field [0001] The present invention relates to the field of metallurgy, in particular to the technical field of steel rolling heating furnaces, and more specifically, to a method for testing the oxidation burning loss rate of steel billets processed by steel rolling heating furnaces. Background technique [0002] Rolling heating furnace is a conventional equipment of iron and steel enterprises. Its function is to heat the billet formed by steelmaking to the temperature required for rolling. The temperature of the billet varies according to the steel type, generally about 1200°C. [0003] The billet is gradually heated to the target temperature in the heating furnace, and the main element Fe of the billet will interact with the oxidizing component (O 2 , CO 2 , H 2 O, SO 2 Etc.) A chemical reaction occurs to cause the surface of the billet to be oxidized, which in turn leads to a decrease in the yield of the billet and an increase in production costs. In addition, since the...

AI Technical Summary

Problems solved by technology

In actual production, there is no problem with the weighing of the steel billet before entering the furnace, and the data is collected during production. The key point is that the steel billet enters the roller table directly after being released from the furnace, and the oxide scale on the surface is removed by the high-pressure water dephosphorization device, and then enters the rolling mill unit Rolling, the rhythm is tight, and online weighing cannot be realized

If a certain steel billet is used as the research object to carry out a separate test, and it will be treated separately after it comes out of the furnace. Due to the high temperature of the steel billet out of the furnace, it is impossible to weigh it immediately. It needs to be placed until the steel billet is cooled before weighing. Oxidation will inevitably occur, which will cause the oxidation burning rate to be too large and the test will be inaccurate; if it is cooled by high-pressure water dephosphorization, although the cooling speed is fast, the quality of the steel billet will be affected after water spraying, and the measured oxidation burnt Loss rate is not accurate

What's more, the method of separately processing the discharged steel billets has a certain impact on the on-site production rhythm, and the researched steel billets cannot be rolled, and must be reheated before rolling, resulting in energy consumption. At the same time, the organization and implementation of this method is relatively difficult , and only one steel grade can be tested each time. If there are many types of steel grades, the workload will be large and difficult to achieve. Therefore, most of the time, it is not possible to clearly and accurately grasp the oxidation burning rate of different steel grades in the heating furnace. Can only be estimated based on long-term production experience

If the exact value of slab oxidation burning loss is required, especially to understand the comparison of slab oxidation before and after taking relevant measures to reduce oxidative burning loss, experience alone cannot give a convincing answer, nor can it determine the extent to which the relevant measures play a role. have a clear judgment

Images