Right designation: "Quenching and Tempering Plant" or "Tempering and Quenching Plant&

[TobiJ]

Hello,

after stainless steels are hardened by austenitizing, the following step would be tempering. What is the right designation of the tempering facility?
"Quenching and Tempering Plant" or "Tempering and Quenching Plant"? I always read "Q&T" , but the sequences of the tempering treatment acctually is tempering and then quenching...I am confused.

BTW: sorry for my english...

 

[arunmrao]

What grade of stainless steels? Austenitic grades do not harden. Martensitic grades are hardened and tempered.

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[hydtools]

Generally the steps are quench to harden, then temper to toughen. Both processes involve heating to some temperature followed by cooling(quenching). Might be called harden then temper.

Ted

 

[TVP]

arunmrao and hydtools are correct. The typical sequence is like this:

1. Heat to high temperature (austenitizing, > 800 C)
2. Quench in oil/water/etc (~ 25 to 100 C)
3. Heat to intermediate temperature (tempering, ~ 180 to 600 C)
4. Quench in oil (~ 25 to 50 C)

Standards such as ISO 15787 Technical product documentation — Heat-treated ferrous parts — Presentation and indications recommend the following:

The condition after heat-treatment shall be specified in words indicating the required condition, for example,
“quench hardened”, “quench hardened and tempered” or “nitrided”.

This is why industry has adopted the usual description of Quenching and Tempering, meaning quench hardened and tempered.

 

[TobiJ]

Thanks for the quick answers!

@TVP: I need to know the right identification name for the plant, which only involves step 3 and 4 (the martensitic stainless steel has already been harden). I saw a plant, which was offline and only for induction tempering with subsequent quenching (water).

 

[TVP]

Ah, now I understand your problem. You should just refer to it as a Tempering Plant or Tempering Line or Tempering Machine. If it is specifically for induction heating, then call it Induction Tempering Plant or Induction Tempering Line or Induction Tempering Machine. You can be extremely specific about the units that comprise the system if you want:

- induction heating system with power supply, coil,
- cooling system with quench ring (spray, shower, etc), integral tank, and heat exchanger
- material handling with robots or conveyor line or ...

Here are some English language documents that you can review:

http://www.efd-induction.com/en/Applications/Tempering.aspx

http://www.inductoheat.com/pdf/79.pdf

 

[hydtools]

TobiJ, simply call it a temper plant.

Ted

 

[TobiJ]

I guess I will name it "Tempering Plant"...My first thought was to call it "Tempering and Quenching Plant", but as far as I understand you guys Tempering always includes Quenching? So no need to mention the Quenching?

 

[EdStainless]

Some tempering is followed by quench, some fan cooling, some uncontrolled cooling.
In high production a quench is most common just for speed.
It is rare for the cooling rate from temper to have significant impact on the properties.

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Plymouth Tube

 

[BillPSU]

How about heat treatment plant.

 

[redpicker]

Most places just call it "Heat Treat" and leave it at that.

rp