Re: [MW:22320] Super duplex ASTM G48 practice A & E

Hi Mr. Pravin,

Method A is designed to determine the relative pitting resistance  of  stainless  steels  and  nickel-base,  chromium-

bearing alloys and Method B is the critical pitting temperature test for stainless steels. 

for super-duplex, you may consider the following factors 

1.ASTM G 48 Method A.

2. Exposure time shall be 24 hours.

3.Samples should not pickled or passivated before test as it may affect the test result.

4.Test temperature for UNS S32550, S32750, UNS S32760, S39274 weld samples (25% chromium "super" duplex)         shall be 40°C.

Examination and Evaluation: -No pitting at low-power magnification and maximum weight loss shall be less than 1.5 g/m2.

Please refer the attached article for further information

Thanks & Regards,

LALU R.P

+971501594161

On Fri, Nov 21, 2014 at 7:25 AM, Pravin Poornachandran <htcispravin@gmail.com> wrote:

Dear expert,

what is the different between practice A & E when comes to super duplex.

Normally which practice is widely used?

Kindly advice.

Best regards,

​​

Pravin Poornachandran

Welding Engineer

Singapore

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