Re: [MW:7838] low temperature pipe and ASTM A106

Martin :

From the chemical composition point of view there is no significant difference between both material.
However, to be classified as LTCS one manufacturer shall conduct additional impact test in a certain low temperature,as mandated in section 8 of ASTM A 333, where as you can compare ASTM A106 does not requires such test.

Vice versa, to be classified as A 106 (high temperature service) codes require material withstand more stringent test at high temperature.

Please take a look at ASME sec II part D here you can see at 550 C A106 "still" has recommended tensile strenght of  11.2 Mpa, while A333 only recomended up to 375 C

other member please correct me if i'm wrong.

Regards
Bonardo

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From: Martin Prad <martin_prad@hotmail.com>
To: materials-welding@googlegroups.com
Sent: Tue, 26 October, 2010 6:58:54 PM
Subject: RE: [MW:7834] low temperature pipe and ASTM A106

Dear sir,
 
I know that it is a LTCS. Please see below the properties of them separately extracted from the material certificate.
 
ASTM A333 Gr.6
Chemical composition
C-0.16, Si-0.19, Mn-1.03, P-0.010, S-0.003, Cr-0.18 and etc....
Mechanical properties
YS-315 mpa
TS-478 mpa
Heat treatment condition
Normalised at 920 degree C
 
ASTM A106 Gr.B
Chemical composition
C-0.15, Si-0.15, Mn-1.05, P-0.020, S-0.010, Cr-0.20, Ni-0.020 and others
Mechanical properties
YS-295 mpa
TS-515 mpa
Heat treatment condition
Hot finished
 
As you see there is no major difference between these two pipe grades by chemical composition and mechanical properties. therefore the question I would formulate as follows:
 
1. If the above parameters are similar why we can not use 106 gr b pipe in low temperature service?
2. Which mettalurgical or chemical process makes the pipe LTCS?
 
Thanks.

 

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Date: Tue, 26 Oct 2010 13:04:38 +0300
Subject: Re: [MW:7823] low temperature pipe and ASTM A106
From: neethipathi@gmail.com
To: materials-welding@googlegroups.com

A106 Grade Carbon steels are called KILLED carbon steel and used for Normal and  Hot services(Temperature ranging between 100 ^oF - 750 ^oF .Where as A53 Grade carbon steels were not called as Killed caron steel.

A333 Grade car steels were suitable for Low temperature services.

 

A106 Grade B Carbon Steel Pipes - Pressure and Temperature Ratings

Pressure (psig) and temperature (deg F) ratings of A106 Grade B carbon steel pipes - temperatures ranging 100 ^oF - 750 ^oF

Ratings are given for standard seamless pipes at temperatures ranging 100 ^oF - 750 ^oF. Ratings in psig based on ANSI/ASME B 31.1.

 

¹⁾ STD (standard) = schedule 40
²⁾ XS (extra strong) = schedule 80

ASTM A333  Grade Pipes

 

Material standard：
ASTM A333——Seamless and Welded Steel Pipe for Low-Temperature Service
Mainly Grade：
Grade 1, Grade 3, Grade 4, Grade 6, Grade 7, Grade 8, Grade 9, Grade 10, Grade 11 

 

 

On Tue, Oct 26, 2010 at 8:31 AM, Martin Prad <martin_prad@hotmail.com> wrote:

Hi,
 
What is the real difference of ASTM A333 pipe from ASTM a106grB?
ASTM A333 is a low temperature CS pipe but 106 is not. What is the main features of Low temperature CS steel pipes by their chemical composition and mechanical properties?
Please share your experience on this.
 
Martin.

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