ASTM A182 F22 Quench Properties

In summary, the speaker is looking for a method or specification to determine how much the hardness will decrease when machining off some of the quenched and tempered F22 material. They mention that the Critical Diameter analysis is not suitable for this case and ask if the Jominy End-Quench Test is a viable option. They also provide a link to a Wikipedia page on hardenability to potentially provide more information on the topic.
  • #1
Quality Man
1
0
Greetings!

First time poster here. I'd appreciate whatever help anyone can provide.

I have some pieces of F22 that were quenched and tempered. My customer needs to know how deep the quench properties extend, as he intends to machine off some of the O.D.

Critical Diameter analysis is not appropriate because some of the elemental percentages are outside the ranges evaluated by Grossman.

I need a method, spec, link, or something to determine how much drop in hardness to expect as material is removed.

Thank you!
 
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  • #2
As part of a process qualification, in this case a quench, one would normally take parts of a given geometry at some temperature, quench one or some small number, then cut the pieces transverse (normal to the heat transfer surface), and with metallography ascertain the microstructure (grain size and morphology), and perhaps measure hardness with the appropriate method. Then one would have a profile of physical properties as a function of depth.
 
  • #3

1. What is ASTM A182 F22 Quench Properties?

ASTM A182 F22 is a standard specification for forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves for high-temperature service. The quench properties refer to its ability to withstand rapid cooling or quenching without cracking or distortion.

2. What are the typical quenching methods used for ASTM A182 F22?

The most common quenching methods for ASTM A182 F22 include oil quenching, air quenching, and water quenching. The specific method used will depend on the material thickness and desired properties.

3. What are the key factors that affect the quench properties of ASTM A182 F22?

The key factors that affect the quench properties of ASTM A182 F22 include the chemical composition, heat treatment process, and cooling rate. The material's carbon content, alloying elements, and microstructure also play a significant role.

4. What are the recommended heat treatment processes for ASTM A182 F22 to achieve optimal quench properties?

The recommended heat treatment processes for ASTM A182 F22 include normalization, annealing, and tempering. Normalization involves heating the material to a specific temperature, holding it for a set time, and then cooling it in air. Annealing involves heating the material to a high temperature and then slowly cooling it in a furnace. Tempering involves reheating the material to a lower temperature after quenching to improve its toughness and ductility.

5. How do the quench properties of ASTM A182 F22 compare to other steel grades?

ASTM A182 F22 has excellent quench properties compared to other steel grades due to its high chromium and molybdenum content. It has a high tensile strength, good ductility, and excellent corrosion resistance, making it suitable for high-temperature applications.

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