Pickling and passivation of 17-4Ph Stainless steel

[Hrushikesh Sangamnerkar]

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.

[C.Muni]

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

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[Rajesh Kasvala]

Because of after the welding precipitation of chromium layer on welding so remove this layer pickling requirement.but after solutions annealing already his layer remove so not required

Regards

Rajesh

Sent from Yahoo Mail on Android

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[Hrushikesh Sangamnerkar]

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.

[C.Muni]

Dear Friend,

If you don't have ITP,Can you send the drawing.Chemical and all no issues.After heat treatment ,we cannot do directly acid pickling n passivation.We hv to do some grinding n blasting operations before acid pickling.

[Shyamal Das]

hi

Actually its not needed , but no harm in doing after heat treatment . Scale formations removal better  option is buffing . pickling & passivization works in creating Cr oxide layers (0.00025um)

scales are much deeper .

kr

shyamal

On 7 April 2018 at 10:07, Hrushikesh Sangamnerkar <hrus...@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 <cmk...@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, <hrus...@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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[C.Muni]

After heat treatment,buffing won't b effective

On Sat 7 Apr, 2018, 12:51 PM Shyamal Das, <das.s...@gmail.com> wrote:

hi

Actually its not needed , but no harm in doing after heat treatment . Scale formations removal better  option is buffing . pickling & passivization works in creating Cr oxide layers (0.00025um)

scales are much deeper .

kr

shyamal

On 7 April 2018 at 10:07, Hrushikesh Sangamnerkar <hrus...@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 <cmk...@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, <hrus...@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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[Kannayeram Gnanapandithan]

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 <hrus...@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 <cmk...@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, <hrus...@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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[C.Muni]

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

On Sat 7 Apr, 2018, 2:01 PM Kannayeram Gnanapandithan, <kgpan...@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 <hrus...@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 <cmk...@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, <hrus...@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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[PGoswami]

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:pgos...@quickclic.net,pradip....@gmail.com

[Hrushikesh Sangamnerkar]

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.

[Kannayeram Gnanapandithan]

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

[Hrushikesh Sangamnerkar]

Thank you for the input.

Can I get any ASTM standard to carry out this test?

If you have any technical literature on this pl share