Stainless Steel 1.4436 and 1.4401 1

[Mehlue]

Hi Guys,

Just a quick question, Besides their chemical composition what is the difference between 1.4436 and 1.4401 stainless steels and is there an AISI name for 1.4436 (or is it also 316)

Thanks & Regards,
Mehlu

 

[metengr]

https://www.outokumpu.com/products/...bwGVyk4Pmso1lgS1SjqCG5N-4Iurb3MBoCA_kQAvD_BwE

If you review the data sheet on the link I provided, the 316/4436 grade has higher molybdenum content for increased corrosion resistance (pitting) in comparison to the 316/4401 grade.

 

[XL83NL]

The chemical difference is small, but can be found comparing e.g. 1.4436 specs (such as this or this one) w/ A182 F316 chemical requirements. Differences I found where in Si, P, Ni, Cr.
I dont know where 1.4436 is used for, but Ive seen variations of 316 (e.g. 1.4435) which are specific to certain applications or forming methods. The changed chemical composition in 1.4436 may be due to improved machinibility, but Im not sure.

 

[Mehlue]

Thanks guys, much appreciated.

We want to manufacture road tanker manhole lids using 1.4436 material. What we not 100% sure about it the material's machinability, will it work the same as 1.4401/4404 or it will give us a run for our money?

Lastly - is it safe to say 1.4436 is equivalent to 1.4401/316 (mechanical & physical properties).

 

[XL83NL]

Lastly - is it safe to say 1.4436 is equivalent to 1.4401/316 (mechanical & physical properties).

No, you need to review the mechanical properties and verify what the differences are. Physical properties may also vary, such as corrosion resistance (PREN will be different due to to differemnt Cr and Ni content, perhaps also Mo).

 

This information is easily googled.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[Deanlover]

1.4436 similar to TP316H,
1.4401 similar to TP316

 

[EdStainless]

No Dean, 4436 is also an L chemistry.
There are a lot of variations of 316L.
There are only UNS designations for about 12 of them (if I leave the weld fillers out), but manufacturers have may variations.
When I worked for a large American SS mill we had 38 different melt codes for 316 grades.
In most countries a road tanker would have to be built to an existing standard. As long as the 'odd' alloy that you are looking at falls within the required chemistry range of a specified material you would be fine.
The property variations are minimal among these sub-grades.
The corrosion resistance is only different for some of the higher Mo grades.

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P.E. Metallurgy, Plymouth Tube