Re: [MW:27656] Pickling and passivation of 17-4Ph Stainless steel

Since more iron in pH steel, nitric will react and colour became very dark and dull. Citric acid also will not give shining unless it is properly mixed. Better is mechanical cleaning, Glass bead Blasting

On Sun 8 Apr, 2018 8:24 am Hrushikesh Sangamnerkar, <hrushi612@gmail.com> wrote:

Thank you sir.

Citric acid treatment I have read. It is suitable for 17-4Ph steel. 

If possible sir can you please give some technical aspect as to why 17-4PH can't be pickled and passivated with normal practice.

On Sat, Apr 7, 2018, 20:15 PGoswami <pgoswami@quickclic.net> wrote:

Hrushikesh,

 

You may explore the possibilities of pickling by "Citric Acid". Search in google , there are some NASA presentation/s on Citric acid pickling and passivation treatment for various stainless , e.g. 304, 17-4ph &  more.

 

The heading is Citric Acid Passivation  of Stainless Steel.

 

As this  document is  strictly copyrighted ,I would say circulating them in the forum would not be appropriate, however you may download and read , using the above link.

 

 

This grade of  steel have  less corrosion resistance than 300 series, plus hardness is always more. Conventional HNO3 +HF treatment may make them prone to SCC  and other general corrosion related damages making them vulnerable in service.

 

Hope this would help you.

 

Thanks.

 

P.Goswami.P.Eng, IWE.

Welding & Metallurgical Specialist

Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/

Email:pgoswami@quickclic.net,pradip.goswami@gmail.com

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of C.Muni
Sent: April 7, 2018 4:53 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:27653] Pickling and passivation of 17-4Ph Stainless steel

 

What's that?Can you explain pls.Is it environment friendly?

 

On Sat 7 Apr, 2018, 2:01 PM Kannayeram Gnanapandithan, <kgpandithan@gmail.com> wrote:

go for glass bead blasting

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  AWS-CWI, CSWIP 3.1,

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

 

On Sat, Apr 7, 2018 at 11:37 AM, Hrushikesh Sangamnerkar <hrushi612@gmail.com> wrote:

I don't have the ITP.

Customer says that after heat treatment, scale formations needs to be removed. Pickling passivation if done then wch chemical reagents to be used as for this material issue is that the scales doesn't get removed after pickling passivation.

 

On Sat, Apr 7, 2018, 09:27 C.Muni <cmkfc07@gmail.com> wrote:

It's possible to do acid pickling n passivation.Can you give details about construction code and approved ITP pls

 

On Sat 7 Apr, 2018, 8:40 AM Hrushikesh Sangamnerkar, <hrushi612@gmail.com> wrote:

Dear experts,

My query is:

I have weldments joining SS 304L # 17-4PH material. The weldments are subjected to heat treatment.

My customer is of the view that 17-4PH cannot be subjected to pickling and passivation after heat treatment. 

Can anyone provide technical literature as to why SS 17-4PH grade can't be subjected to pickling and passivation?

 

Thank you.

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