中文版 中文版  |   EnglishEnglish
搜索
Search

NEWS

/
/
/
What are the advantages of cast iron rolls

News

What are the advantages of cast iron rolls

  • Time of issue:2022-07-14 11:35

What are the advantages of cast iron rolls

  • Time of issue:2022-07-14 11:35
  • Views:
Information

The road roller is one of the parts consumed by steel production, and plays an important role in metallurgical equipment manufacturing and steel production. High chromium cast iron is still one of the commonly used roll materials for hot rolling mills due to its low cost and good adaptability. With the improvement of modern energy saving and environmental protection requirements, how to reduce the cost of raw materials has become a concern of cast iron roll enterprises. The advantage of the steel material is its reusability. Using scrap iron and steel can not only realize waste utilization, but also greatly reduce the cost of raw materials.

The production of high chromium cast iron rolls generally adopts electric furnace melting and centrifugal casting. Electric furnace melting is a melting method that can make full use of scrap iron and steel. It has become a common practice for rolling mills to use a large number of scrap rolls and scrap steel. However, due to the different waste raw materials, due to the same smelting and casting, the casting structure may be different, which will affect the process performance and structure and performance of the roll. In order to reduce the production cost of high chromium cast iron rolls , high chromium cast iron wear plate (25%Cr) was used instead of Cr-Fe alloy as the main raw material to produce high chromium cast iron rolls.However, in the subsequent heat treatment, the composition of this batch of rollers is not much different from that of the rollers produced by ferroalloy, but there is a certain difference in the heat treatment process, and the tendency of sub-temperature fire cracking increases , but the reason is not clear. Therefore, how to rationally utilize waste high-chromium cast iron requires an in-depth analysis of the solidification structure of the two rolls and the structural transformation of the roll heat treatment process and its influence on the structure and performance.

This paper compares and analyzes the solidification structure of two rollers of the same size produced by the same process using high-carbon sponge iron, a small amount of scrap steel and ferroalloy raw materials: one uses high-chromium cast iron wear-resistant plates as the main raw material. At the same time, the difference in structure and performance of the two rolls after the same heat treatment process is studied. Through the study of the difference in structure and process performance, the rational use of waste materials and the adjustment of the heat treatment of the cast roll provide experimental data for ensuring the performance of the roll.

Experimental Material The Rings Were Cut from Two Highromium Cast Iron Rolls of the Same Specification . Both Types Are Produced USING The Same Smelting And Casting Process, and the First Type Uses SPONGE Iron, Iron Alloys and a Small Amount of Scrap AS raw materials, called Roller A (Rollera). A 58% added scrap high chromium cast iron wear plate, called Roll B, had little difference in chemical composition between the two rolls, the difference being that Roll B had about 0.1% less carbon than Roll A.

In order to study the difference in the heat treatment process of the two roll materials, the effects of heating temperature and cooling rate on the phase transition during cooling were measured by LINSEISL78 expander. The sample size is a cylinder of 3mm10mm; the austenitiz ing temperature is 1020, and the adiabatic is 0.5h. The cooling speed is 10, 3, 1/min respectively. In order to simulate the effect of the heat treatment process of the actual roll on the structure and performance, the sample was quenched and tempered in the muffler with a sample size of 10mm10mm8mm.After the sample is austenitized at 1020°C and held for 1h, the cooling rate is adjusted, which is similar to the actual roll quenching and cooling, cooled at room temperature, and then ignited twice at 400, 450, 500, 550 and he ld for 10h. After the sample was corroded by 5% nitric acid alcohol, the microstructure was observed with an Axiovert200MAT optical microscope. The morphology of carbides in the samples was observed by S-3400 thermal field emission scanning elect ron microscope (SEM). D/ MAX2500PC X-ray diffraction (XRD) was used to measure the retained austenite content. Use the HR-150C Rockwell hardness tester to measure the hardness of each sample, test each sample at least 5 times, and calculate the average value.

There is currently no information to display
Please add data record on website background.
产品分类

Lianqiang metallurgical roll

Add: No. 8 Guofeng Street, Fengnan District, Tangshan City, Hebei Add: Liucheng Economic Development Zone, Chaoyang City, Liaoning Province
Phone:
13722533381
E-mail: sales@lianqiang.com

Domestic business contacts: Wang Lili, Xu Xiaoqian, Li Weikai
Mobile WeChat synchronization: 13333295129 19912326376 18731995853
Contact person for export business: Liu Zhuzhu
Mobile WeChat synchronization: 13832886863
Fax: 0315-8129356 8112576 0421-7021209

Lianqiang

 WeChat

Copyright ©Tangshan Lianqiang metallurgical roll Co., Ltd   冀ICP备08102597号   300.cn Tangshan

Copyright ©2021 Tangshan Lianqiang metallurgical roll Co., Ltd

冀ICP备08102597号   300.cn Tangshan