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The objective of this project is to characterize the metallurgical condition and mechanical properties of AISI 304 stainless steel that has been aged continuously at 430 degrees C. for about 410,000 hours.
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ASSET (Alloy Selection System for Elevated Temperature) is a powerful high temperature corrosion prediction program that was developed in a JIP with MTI, Shell and others with DOE funding in 2000-2005. Action is required to update the software and improve its functionalities so that it can continue to be of value to MTI members.
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The project consists of data collection from literature failure reports and member company surveys stating as much as feasible the pertinent failure conditions such as: Metallurgy, Operating Temperature (range), Time to cracking, Wall thickness, Microstructure that cracked (Weld/HAZ/Base/grain size/heat treatment condition at fabrication/repaired or not/etc), Weld geometry and technique, Estimate of % of cold work, Repair welded (before or after PWHT/service), and any other factors. This information ...
The project objective is to investigate the relationship between various shot peening parameters on the galling and corrosion resistance of select nickel-based alloys.
NH3-cracking is very different from NH3-synthesis and any ranking of materials regarding resistance against NH3-cracking is almost unknown, because of the higher temperatures (600-900°C) and much higher nitriding potentials. This project aims describe the nitriding effects - and what can be done to prevent/delay those - in 100% NH3 (with and without 0,2% water) during the process step of pre-heating the ammonia at temperatures between 200 and 550°C. Nitriding experiments under pressurized conditions ...
There are numerous standard ASTM test methods for determining the relative resistance of materials or surface treatments to impingement, dry sliding wear, and wet reciprocating wear, however, there is no established correlation between a material’s mechanical properties and its wear resistance. The relationship between such wear tests and actual wear performance in equipment is unclear. The objective of this project is to develop approaches to predict wear rates for a range of materials frequently ...
No tool exist for predicting the corrosivity in the aqueous streams in renewable fuel processing units. The aqueous phase contains a combination of chemicals (CO, CO2, H2S, NH3 and HCl) which are all outside of the existing available models. The goal is to better understand the limits for corrosion resistant alloys under the aqueous conditions present in renewable fuel processing units
The objective of this project is to produce an atlas for alloys C-22, C-2000, 59 and 686 microstructures that clearly identifies the phases that occur in the alloy. The thermo-mechanical processing and welding that produced the microstructure will be properly documented with each case. The microstructural cases will be correlated with published or computer generated TTT data to explain the presence of each phase.
Create a guideline for failure mechanisms in the pulp and paper industry. This reference will include generic pulp and paper unit Process Flow Diagrams with the applicable damage mechanisms for each system in the process. Specifically, it will include the following mechanisms which are not available elsewhere: - Continuous Digester Caustic Stress Corrosion Cracking inspection techniques and repairs - Sulfur Stress Corrosion Cracking (Turpentine Systems) - Stress Assisted Corrosion - Recovery ...
Guidelines for evaluating equipment used in manufacturing of chemicals used in the high purity industry.
Develop standard, critical and operational IOW templates/guidance for the most common chemical plants. The common chemical process IOW templates will be a MTI stand-alone product and/or serve as an addendum to API 584.
Study the corrosion behavior of bio-oil under low temperature conditions where carbon steel, low-alloy, and 3XX materials may or may not have acceptable corrosion rates. Additional work includes a surface corrosion study and report of Phase 0, Phase 1, and Phase 2 coupons.
AMPP SP0170 provides guidance on the sensitization temperature range for common stainless steel grades. There is evidence from observations made in operating plants that these current temperature ranges might be overly conservative. This project will focus on reevaluating the long-term minimum temperature limits for sensitization of chemically stabilized stainless steel grades, 321 and 347. The aim is to determine if a higher minimum sensitization temperature can be supported from recent technical ...
The objective of this project is to identify corrosion data for aqueous lithium halide systems useful for CPI processes that is not available in the literature. Laboratory corrosion tests will be funded to create the needed data for use by MTI members.
An Alloy 625 vessel with heads, piping, welds, and flanges that was operated at the lower temperature regime of the TTT curve with exposure of about 40,000 hours has been removed from service and is available for metallurgical analysis. The project objective is to create an addendum to the Atlas of Microstructures for 625 with analysis of this material that would document the microstructure of this alloy with actual long term service exposure at moderate temperature.
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