Please go through the LINCOLN-SMITWELD, Doc # LSW01463 Rev: July 1992, File # LN/COMDG207 Title: Welding Duplex and Super Duplex Stainless Steels - A Guide for Industry. You would have most the question answered in this document. By the way, why do you want to clad on some other metal. Is other metal carbon steel? If so please don't do that you would have other problem such as reversing of phase equilibirium to normal stainless steel. The reason for selection of Duplex Stainless Steel is to hold pressure in relatively lesser thickness of vessel than High Carbon Steel, high resistant agains corrosion and lighter in weight. Please provide information on the vessel on that you want to clad.

Regarding your question whether DSS can withstand thermal cycle, yes! it can be heat treated between 1050 - 1100C and time between 5 to 30 minutes depending upon the thickness.

Dear AbdulWasay,

why do you want to clad on some other metal. Is other metal carbon steel? If so please don't do that you would have other problem such as reversing of phase equilibrium to normal stainless steel.

The required process on which ksuviresh asking is a weld deposit by strip cladding, which is differs from cladding (cladding in ASME is covered by ASME SA-263, SA-264 & SA-265), and all of those processes are differ from lining. And if he used a dilution layer or what we called a butter under the DSS, I think there is no problem.

Note. The reason for selection of Duplex Stainless Steel as a strip cladding for this case is not "to hold pressure in relatively lesser thickness of vessel than High Carbon Steel", but to have a high corrosion resistant higher than its similar for CS. Because in the presence of a base metal (may be carbon steel) the design shall be based on the thickness of CS only, and the weld deposit layer (or cladd) thickness representing the corrosion allowance. And the thickness of weld deposit shall not contributed in the min. required thickness tr to withstand pressure and temp., where vessel nominal thickness, tn = tr + CA.

Dear ksuviresh,

From ASME code, Section II, Part A, material SA-263 "Specification for Stainless Chromium Steel-Clad Plate", Para. 5.2 speaks about heat treatment for clad steel, this indicates that the code has no prohibition for heat treatment of clad steel and this encourage us to consider the same condition can be applied to weld deposit using strip clad.

Quote. 5.2 Heat Treatment - Unless otherwise specified or agreed upon between the purchaser and the manufacturer, all plates shall be furnished in the normalized, tempered, normalized and tempered, or quenched and tempered condition as permitted by the backing steel specification. Stress relieving of the composite plate by heating subcritically is permitted, provided the temperature is 75°F [40°C] or more below the minimum tempering temperature (when tempered). Unquote.

So, I think taht:

1. DSS can withstand normal PWHT cycle as per Div-1.

4. Strip cladding is allowed and the filler metal is available from common manufacturers such as Hobart, Lincoln, ESAB, ... etc.

If you want to avoid all the issues about pwht of duiplex and welding procedures with problems of dlilution and ferrite/autenite content you should opt for an integral duplex vessel.

why you want to use a 904L? usually in dissimilar weld of duplex is used a 309 material.

Why Clad when there is Duplex?
http://www.outokumpu.com/applications/pub/res.asp?txtFind=why+clad&selLang=EN-GB&hdnBA=2#

http://87.230.33.128/_files/stainless_steel/Duplex_Stainless_Steel.pdf

S.

corrosion control & protection

How about a new technology! Single pass sub-arc with a surface chromium content greater than 32% and the EPRI guy's don't own it...this was developed buy some of the old Nooter group people for the urea bis.