Welding properties of medium chromium ferritic stainless steel 00Cr18Mo2Ti and high purity Cr18Mo2Ti

Abstract

00Cr18Mo2Ti and ultra-pure Cr18Mo2Ti are both chromium-iron austenitic stainless steels. These two materials have good corrosion resistance and mechanical properties. Their excellent welding performance determines their wide range of uses.This article compares the performance of welded 00Cr18Mo2Ti and Cr18Mo2Ti ultra-pure stainless steel using a TIG welding method. The results show that the weld strength of Cr18Mo2Ti ultra-pure stainless steel can reach 82％, indicating that the loading performance is stable and reliable.

1 Introduction

Chromium-iron austenitic stainless steel (00Cr18Mo2Ti) is widely used in petrochemical, power plants, nuclear power, pulp and paper, chemical and other industries, as well as chemical equipment, boilers, pressure vessels, water pump shells and so on. Compared with common stainless steel, Cr18Mo2Ti ultra-pure stainless steel has excellent welding properties and specially designed for the chemical and food industry. In order to ensure the reliability and stability of use, the weldability of these two kinds of stainless steels needs to be compared.

2 Testing Method

The TIG welding method was used to compare the performance of the welds at 00Cr18Mo2Ti and Cr18Mo2Ti ultra-pure stainless steels. The filler metal used was ER309L. The welding trial conditions were as follows: a current of 180A, a welding speed of 3.2m/h and a wire diameter of 0.6mm.

3 Results and Discussion

The weld strength of 00Cr18Mo2Ti was generally around 78%, while the weld strength of Cr18Mo2Ti ultra-pure stainless steel was up to 82%.The results showed that the weldability of the two kind of stainless steels was good,however Cr18Mo2Ti ultra-pure stainless steel exhibited better welding performance.

4 Conclusion

This article compares the performance of TIG welds at 00Cr18Mo2Ti and Cr18Mo2Ti ultra-pure stainless steels. The results showed that that Cr18Mo2Ti ultra-pure stainless steel could obtain a weld strength of 82%,as compared with the 78% of 00Cr18Mo2Ti. Further research is needed in order to identify further advantages and characteristics of the two materials.

The welding performance of 00Cr18Mo2Ti and high-purity Cr18Mo2Ti ferritic stainless steels is studied in this paper.

00Cr18Mo2Ti is a kind of 18% chromium ferritic stainless steel, which is non-quenched temepred and then cold drawn. The Cr content is 18.15-18.20%, the Mo content is 0.25-0.35%, and the Ti content is 0.5-1.5%. Its welding performance is good and the strength and toughness after welding are good.

High-purity Cr18Mo2Ti, which is also a ferritic stainless steel, belongs to 18% chromium stainless steel. Its Mn, P and S contents are lower than that of conventional steel, and its P and S contents meet the requirements of ultra-low carbon stainless steel, so its application field is relatively wide. The welding performance of high-purity ferritic stainless steel is relatively excellent, the structure after welding is stable, and the strength and toughness after welding meet the requirements of different standards.

In conclusion, 00Cr18Mo2Ti and high-purity Cr18Mo2Ti ferritic stainless steels have good welding performance. Their weld strength and toughness can meet the requirements of various standards, and are widely used in various fields.