RE: [MW:31335] Re: Impact test requirements for LAS

Dear Kiran,

 

It is rare that a low Cr-Mo alloy steel such as Group P5B is required to have an impact test at -29 C in its weld.

These steels are resistant to high temperatures of approximately 470 C to 650 C. So for what impact test? Structurally, for high temperature service a steel with a coarse grain size ASTM 4-5 (creep and oxidation resistant) is needed; and for low temperatures, tough steels with fine grain structure ASTM 8-9 are needed, which are suitable for cold service> -29 C to -45C.

 

The steels grouped in P5B are coarse-grained.

 

ASME B31.3 does not call for impact test at this temperature -29C. First of all, Kiran you must check the service temperature range of this pipe and its welding. What is approved in the Customer's specifications? I think your Customer  is wrong. Talk to him.

 

Regards,

 

Ramon Briceno/ Corrosion-Materials & Welding Engineer

 

Sent from Mail for Windows 10

 

From:
Sent: Tuesday, August 18, 2020 3:36 AM
To: Materials & Welding
Subject: [MW:31328] Re: Impact test requirements for LAS

 

Dear Experts,

 

Please I need your answer to my above query. 

 

My client has mentioned the above 25 mm Impact test would be required, in accordance with B31.3.

 

Question: Are materials, for which a temperature of −20°F (−29°C) is listed in the Minimum Temperature column of

Table A-1, exempt from impact testing for any combination of thickness and temperature above −20°F (−29°C)? Reply: Yes.

The minimum temperature in our scope is not below minus 29°C. If B31.3 calls for impact test within this temperature.

 

Your feedback is very important to me.

 

 

On Tuesday, July 28, 2020 at 10:12:01 AM UTC+5:30 K K wrote:

Dear Experts,

 

Please look into my query, please give me your response on my doubt.

 

Thanks

 Kiran 

On Monday, July 27, 2020 at 11:29:05 AM UTC+5:30, K K wrote:

Hi Experts,

 

"Good Morning"

 

My query has below.

 

Help me to prepare pWPS.

Process : GTAW +SMAW

Material : P.No - 5B   

ASTM A335 Grade P9. Pipe Size - 16" Sch-60. Thickness: 16.66 mm Thickness range: 5mm to 33.32 mm According to ASME B31.3 Table 323.3.1 shall I required an Impact for the above-mentioned thickness and material. As per my knowledge, the above 25 mm impact test would be required.  How I can find according to line class where impact test required or not. If a minus 29° C impact test not required for LAS.

When we shall consider the impact test exemption. 

 

And regarding consumable for P No- 5A 

ASTM A335 Grade P22

 

if I use ER90S-B3 ok or shall I use ER80S-B3 because my client suggest me to use ER80S-B3 please clarify way?

 

Thanks in advance 

 

Regards

Kiran

 

 

 

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