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Re: [MW:4693] RE: 4677] Alternate Material to AISI 316Ti

By Materials & Welding
Dear Prafulla,
                     I would suggest you to go with AISI 316 L, since you should consider the design data requirement for temp conditions.                     
 
316Lalso possesses excellent mechanical and corrosion properties at sub-zero temperatures.  When there is a danger of corrosion in the heat-affected zones of weldments, the low-carbon variety  316L should be used.   316 Ti, the titanium-stabilised version, is used for its resistance to sensitization during prolonged exposure in the 550oC-800oC temperature range.
 
Common Name
Condition
0.2% Proof Strength
MPa
Min
Tensile Strength
MPa
Min
Tensile Elongation (%min)
Hardness
Brinell
HB (max)
Rockwell
Hardness
HRB (max)
Vickers
Hardness
HV (max
 
S 316L Annealed 170 485 40 40 217 95 225
S 316Ti Annealed 205 520 40 40 217 95 225
 
 
 
is 300 Series—austenitic chromium-nickel alloys.
The austenitic grades of wrought stainless steel are designated by numbers in the 200 and 300 series. The 300 series is based upon the classic 18% chromium and 8% nickel stainless steel. Certain modifications of the composition affect the corrosion resistance, whereas other modifications of the composition are made to achieve mechanical properties.

Chemical Composition (ASTM A 240)
 

  C Mn P S Si Cr Ni Mo Ti
316
316L
316Ti		 0.08 max
0.03 max
0.08 max		 2.0
max		 0.045
max		 0.030
max		 1.0
max		 16.0
to
18.0		 10.0
to
14.0		 2.00
to
3.00		 -
0.5 max
5X%C
 
 
Regards,
 
Yadav Shiva Chelliya,
Inspection Engineer,
Doha Qatar,
+974-6166465
On Mon, Apr 5, 2010 at 8:40 AM, Prabhu Kumar L <l.prabhukumar@saipem-india.com> wrote:

Dear Praphulla,

 

The purpose of selection for 316Ti should be used in the temperature range between 600 - 900ºC. This is called Titanimum stabilized grade. In general austenitic (300 series) stainless steels are having problem of sensitization (Chromium carbide precipitation) in the temperature range of 450 - 850ºC. To avoid this problem, stabilized grades of SS shall be selected, hence no chromium carbide precipitation will be formed instead Titanium carbide formation will take place which would not cause for sensitization problem.

 

Also note that if it is for high temperature application, the minimum % of carbon should 0.04 in order to retain fall in strength when temperature increases. This cannot be achieved in 'L' grade steels. Hence, It is suggested to use AISI 316 instead of AISI 316L in place of 316Ti. Also suggested to confirm with design engineer for this application.

 

Regards,

 

L. Prabhu kumar,

Sr. Principal Engineer,

 

Equipments & Materials Dept.,

Saipem India Projects Limited,

Nungambakkam High Road, Chennai - 600 034, India.

Tel:+91 44 43906588, Ext.: 588, Fax:+91 44 66840345,

Mobile Ph. No.: +91 9003010978.

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Praphulla Phirke
Sent: Saturday, April 03, 2010 8:54 PM
To: Materials & Welding
Subject: [MW:4677] Alternate Material to AISI 316Ti

 

Hi All,

Can I used AISI 316L in place of AISI 316Ti?

 

 

Thanks & Regards

Praphulla

praphulla.dp@gmail.com

 

 

 

 




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