[MW:27554] RE: 27548] RE: 27542] Rolling/forming method for Gr.91 Plate

Dear Sir,

 

Thanks for your valued suggestions.

 

Thickness & dimensions of shell & dish end are as below.

 

For shell: requirement of diameter to be formed is 26" with thickness 18 mm.

 

For Dish End : required diameter is 26"

 

Regards,

 

Brajendra Patel

 

Sent from Mail for Windows 10

 

From: PGoswami
Sent: 23 March 2018 19:55
To: materials-welding@googlegroups.com
Subject: [MW:27548] RE: 27542] Rolling/forming method for Gr.91 Plate

 

Hi,

What's the thickness and the diameter involved? It's not always possible to guess the thickness from photographs due to enlargement. Cold forming generally should be avoided for grade-91 steel.

Grade-91 steel is a high tensile steel. Cold bending could lead to cracking and other metallurgical consequences.

API-TR- 938-B recommendations for cold bending of this steel are  as follows:-

• The degree of cold working is usually limited to 17 % maximum (wall thickness reduction), if steels are applied at creep range temperatures.
• Most users would require that cold worked 9Cr-1Mo-V steels be normalized and tempered if the steels are applied in the creep range and the degree of cold working exceeds 17 %.
• Cold deformation requires heat treatment by most codes for deformation greater than 5 %

 

You need to think about warm forming  to be on the safe side.

 

Appreciate response with details.

 

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 Brajendra Singh
Sent: March 23, 2018 3:19 AM
To: materials-welding@googlegroups.com
Subject: [MW:27542] Rolling/forming method for Gr.91 Plate

 

Dear expert's,

Please share the forming/rolling requirements for A387 Gr.91, we have tried cold forming/rolling of shell & dish end but always cracking.

Attaching photographs for refrence.

Thanks in advance

 

Regards, 

Brajendra Patel

Mob:+917057406907

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