Session: High-Temperature Materials and Corrosion Evaluation and Mitigation
An enhanced UNS S44400 (K44M) Ferritic Stainless Steel Grade for CH4-H2 Burner Application (C2026-00095)
Thursday, March 19, 2026
9:00 AM - 9:30 AM Central
Location: 361 DE
Earn .5 PDH
Interested in reading the entire paper? Click on the "Paper" button below to read on the AMPP Knowledge Hub!
*Please note, if your registration came with access to the conference proceedings don't forget to login to your AMPP Knowledge Hub account to access the paper for free. If you login and don't have access to the paper, you can purchase the individual paper or purchase the entire conference proceedings on your Knowledge Hub account.
K44M, a ferritic stainless steel, improves upon UNS S44400 with 19%-wt. Chromium, niobium, and molybdenum, omitting titanium. Designed for applications up to 1000°C, it boasts superior high-temperature mechanical properties, wet corrosion, and cyclic oxidation resistance. Its high-temperature performance and cost-effectiveness make it ideal for H2-blended CH4 burners. This paper will detail the grade's wet and hot corrosion resistance, highlighting benefits of high-temperature pre-treatment (>700°C) and the advantage of higher chromium for severe corrosion at ~600°C. While 950°C oxidation is slightly faster than alumina-forming grades, it's parabolic and not a long-term issue. The paper also explores hydrogen's impact on oxidation, noting K44M's superior resistance in H2 or mixed H2/H2O-O2 atmospheres due to high chromium and molybdenum. Fabrication mirrors UNS S44100 (forming, welding), with easier brazing due to no titanium. K44M's improved high-temperature properties, corrosion resistance, and ease of fabrication make it an excellent alternative to alumina-forming ferritics for burner applications, with a lifespan exceeding 15 years.
