Medium chromium ferritic stainless steel 00Cr17Ti (436LX) weldability

Weldability of 00Cr17Ti (436LX) Ferritic-Austenitic Stainless Steel

Introduction

00Cr17Ti (436LX) ferritic-austenitic stainless steel is a stainless steel alloy that combines both ferritic and austenitic characteristics. This combination of the two types of steel creates a stainless steel that has excellent weldability, is resistant to corrosion and has good resistance to fatigue. By combining ferrite and austenite, 00Cr17Ti (436LX) can be used in a wide range of applications, including but not limited to pressure vessels, boilers, valves, fittings, and tubes.

Welding Properties

00Cr17Ti (436LX) ferritic-austenitic stainless steel has excellent weldability, meaning it is easy to weld and has excellent mechanical properties at both high and low temperature. To ensure optimum weldability, proper preheating and post-welding heat treatments must be done. This will help ensure that the microstructure of the welded region is sound.

Another benefit of 00Cr17Ti (436LX) is its resistance to thermal cracking during welding. When compared to other common stainless steels, 00Cr17Ti (436LX) displays excellent resistance to thermal cracking when it is welded at both low and high temperatures.

Alloy Composition

00Cr17Ti (436LX) ferritic-austenitic stainless steel is a chromium-nickel-titanium alloy. It is composed of the following elements:

• Chromium: 17%

• Nickel: 11%

• Titanium: 0.55%

• Carbon: 0.026%

• Si: 0.021%

• Mn: 0.15%

• P: 0.024%

• S: 0.004%

• Cu: 0.07%

• Mo: 0.38%

• Fe: Balance

Conclusion

00Cr17Ti (436LX) ferritic-austenitic stainless steel is an alloy that combines the benefits of both ferritic and austenitic properties. This alloy offers excellent weldability, corrosion resistance, and thermal crack resistance. It is composed of 17% chromium, 11% nickel, and 0.55% titanium. When proper preheating and post-welding heat treatments are done, 00Cr17Ti (436LX) ferritic-austenitic stainless steel is an excellent choice for many high temperature and pressure applications.

00Cr17Ti (436LX) is a ferritic stainless steel. It is widely used in chemical, refrigeration, and food-processing equipment. Compared to 304 and 316 grades, it is slightly more resistant to corrosion.

00Cr17Ti (436LX) can be readily formed and welded using welding processes such as gas tungsten arc welding (GTAW), plasma arc welding (PAW), and shielded metal arc welding (SMAW). It has good welding properties, but welding of this material should not be performed without first preheating the material to mitigate the risk of cracking.

The heat-affected zone (HAZ) of the weld can be susceptible to sensitization, which can lead to intergranular corrosion. To reduce the risk of this, welding should be performed with a filler metal that is very low or no-chromium content. Proposed filler metals may include 309L and 316L stainless steel or the 309 MO or 347 MO stabilized stainless steel.

In general, 00Cr17Ti (436LX) can be welded with either no joint preparation or a simple square or beveled edge. It is important to use an appropriate shielding gas including, but not limited to, argon or argon/nitrogen mixtures.

Welding of 00Cr17Ti (436LX) requires special considerations, but the rewards of doing it correctly are well worth the effort. When properly welded, this material can provide superior corrosion-resistant properties for many applications.