Heat treatment temperature for S31803

[501004]

Hi,

Iam a quality engineer in L&T Valves, India.

Anybody could clarify and advise me the following,

Background:

We usually get Rolled bar from traders with a Mill TC.

For example:
Material grade: 316, F51 bars.

Mill Test certificate reports Heat treatment as 'Solution annealed'.

It doesn't mention at what temperature and duration, the solution annealing was carried out.

Clarification required:

What is the temperature and for duration, the solution annealing can be carried out at mill.

Can anybody advise me.

Thanks,
Moses

 

[metengr]

What is the specification used for material procurement?

 

[rodofgod]

Hi! This is easily google-able. I found the answer in a couple of mouse clicks!

 

[XL83NL]

He's from India

 

[EdStainless]

For austenitic grades there is just a min temp in the specs. No requirement for time or actual condition.
Easy to do, and plenty of room to mess it up.

The duplex S31803 is a different case. You need to be within a specific range, and quench rate is critical. This is why in all cases duplex grades should require testing for austenite/ferrite ratio and for intermetallics.

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Plymouth Tube

 

[denlow60]

I have a pdf file for you .

 

[EdStainless]

If the duplex as not required to be tested to A923 and for aust/ferr ratio you have no idea what it really is.

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Plymouth Tube

 

[denlow60]

ASTM A923, "Standard Test Method for Detecting Detrimental Intermetallic Phase in Wrought Duplex Austenitic/Ferritic Stainless Steels", is a specification that was developed for use with specific wrought duplex stainless steel (S31803). The purpose of these test methods is to allow detection of the presence of detrimental intermetallic phases in mill products to the extent that toughness or corrosion resistance is significantly affected. It contains three test methods (A, B & C). Method A is "Sodium Hydroxide Etch Test for Classification of Etch Structures of Duplex Stainless Steels," Method B is "Charpy Impact Test for Classification of Structures of Duplex Stainless Steels" and Method C is "Ferric Chloride Corrosion Test for Classification of Structures of Duplex Stainless Steels".