Materials Flashcards
__________ is a standard specification for seamless and welded ferritic/austenitic stainless steel pipe, particularly for general corrosive service and resistance to stress corrosion cracking.
ASTM A790 (or ASME SA790)
___________ is a standard specification for carbon steel castings suitable for fusion welding, particularly for high-temperature service in applications like valves, flanges, and fittings. It covers three grades: WCA, WCB, and WCC.
ASTM A216
What is the difference between A105 and A234 carbon steels?
A105 is forged carbon steel, and A234 is wrought carbon steel, not casting.
What does WCB stand for?
“Weldable,” “Casting,” and Grade “B”.
In the context of ASTM A216, WCA, WCB, and WCC are different grades of carbon steel castings for valves, flanges, and fittings. These are grades that are suitable for high-temperature service and welding.
What is UNS S32205?
Duplex stainless steel. It has higher tensile and yield strength than austenitic stainless steels and has good balance of hardness and ductility. It has high corrosion resistance at temperatures up to 316°C.
What are the advantages duplex stainless steel pipes?
Duplex stainless steel pipes are designed to resist corrosion and stress corrosion cracking, and are often used in harsh conditions. They are also known for their superior mechanical properties compared to standard austenitic stainless steels.
Stainless steel should be ____________ to maximize its corrosion resistance and ensure its long-term performance. It creates a chemical barrier that protects against rust, extends the product’s life, and reduces maintenance needs.
passivated
When should passivation be done for stainless steel piping?
Passivation is a best practice for newly-machined stainless steel parts and components. It’s also recommended when modifying a high purity water system or joining new tubing to existing tubing.
What is AL-6XN?
It is a stainless steel alloy that’s resistant to corrosion and is often used in harsh environments. It’s also known as UNS N08367, 6% Moly, and ATI AL-6XN.
Composition: 24% nickel, 22% chromium, 6.3% molybdenum, and Trace amounts of nitrogen.
In materials designations, what does “UNS” stand for, and what does it mean?
It stands for “Unified Numbering System” and is an alloy designation system widely accepted globally, and especially in North America. Each material has a unique UNS that is connected to its chemical composition and mechanical properties.
For alloy AL-6XN, what does the “AL” stand for?
In the alloy designation AL-6XN, “AL” stands for “Allegheny Ludlum”, the company that developed and produces the alloy.
AL-6XN: is a registered trademark of ATI Properties, Inc., which is the parent company of Allegheny Ludlum.
