FW: [MW:22014] Hardness relation with H2S environment

Vijay,

 

Failure in sour -service environment (i.e wet H2S environment) is always related to hardness. Please see the introduction in MR-0175. Many materials may have higher Y.S but lower hardness, say 300 series S.S. Contents of  MR-0175 is self explanatory.

 

Thanks 

 

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Specialist

Ontario, Canada

pgoswami@quickclic.net

pradip.goswami@gmail.com

http://ca.linkedin.com/pub/pradip-goswami/5/985/299

 

Introduction

The consequences of sudden failures of metallic oil and gas field components, associated with their exposure

to H2S-containing production fluids, led to the preparation of the first edition of NACE MR0175, which was

published in 1975 by the National Association of Corrosion Engineers, now known as NACE International.

The original and subsequent editions of NACE MR0175 established limits of H2S partial pressure above which

precautions against sulfide stress cracking (SSC) were always considered necessary. They also provided

guidance for the selection and specification of SSC-resistant materials when the H2S thresholds were

exceeded. In more recent editions, NACE MR0175 has also provided application limits for some corrosionresistant

alloys, in terms of environmental composition and pH, temperature and H2S partial pressures...........

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of meisam shokri arfaei
Sent: Monday, September 29, 2014 4:34 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:22012] Hardness relation with H2S environment

I think during hardness you could find exact values related to each area (base metal, weld metal, fusion line and HAZ refer to hardness sketch) but in other tests such as tensile you will find a summary of properties for those areas together (that is not good for root cause analysis or developing design or fit for purpose). 

Also if any doubt remain after hardness, it is practical that you check values again or doing retest. Also check values in relationship with microstructure which are not practical after destructive tests.

Regards  

On Mon, Sep 29, 2014 at 10:48 AM, Vijay Katkar <katkar.vijay22@gmail.com> wrote:

Hi All,

Why NACE is restricting hardness value? Why Not other properties e.g Yield ... etc.

What is the relations between hardness and cracking behaviour ?

Kindly provide your valuable views on this.

Best regards

Vijay Katkar

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M. Shokri Arfaei

ISA-ISTS - Metallurgy Lab. Manager

ASNT NDT Level III

International Welding Engineer

Tel.: +98 21 66282127

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