Re: [MW:23131] RE: 23127] Clarification of SA572 Cu content.

Cu us helping on grain refinement. It is increasing also the strength through precipitation in ferrite matrix. In higher amounts it can be detrimental. Therefore I wonder why there is no an upper limit

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From: pgoswami Sent: Σάββατο, 18 Απριλίου 2015 - 15:36 To: materials-welding@googlegroups.com Reply To: materials-welding@googlegroups.com Cc: biplab.mech@googlemail.com Subject: [MW:23130] RE: 23127] Clarification of SA572 Cu content.

Hi Biplab,

 

Please below the scope of this steel as indicated in SA 572. Also refer the attached data sheet. Generally this steel is used in bridge construction or transmission towers, where weathering resistance is important. Presence of copper helps in that.

 

What would be the application of the steel in this case ?? If for outdoor application then presence of copper would be beneficial as stated previously. Accordingly the PO should be written or modified as required.

 

Appreciate your response.

 

Thanks.

 

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Engineer/Specialist

Ontario, Canada

pgoswami@quickclic.net

pradip.goswami@gmail.com

 

 

Scope

This specification covers five grades of high strength low-alloy structural steel shapes, plates, sheet piling,and bars. Grades 42 [290], 50 [345], and 55 [380] are intended for riveted, bolted, or welded structures. Grades60 [415] and 65 [450] are intended for riveted or bolted construction of bridges, or for riveted, bolted, or welded construction in other applications

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Biplab Pal
Sent: Saturday, April 18, 2015 2:28 AM
To: materials-welding
Subject: [MW:23127] Clarification of SA572 Cu content.

Dear Experts,

I have a doubt of the interpretation of SA572

I chemical analysis it states "A Copper when specified shall have a minimum content of 0.20% by heat analysis (0.18% by product analysis)."

I want to interpret the meaning of specified. Is it PO or MTC.

My case is, contractor has purchased the material of structural steel. Their PO dose not mentioned that certificate need to me mentioned about Cu content, but in Lab test certificate the % of Cu is mentioned and it comes below the minimum requirement. The material shall be accepted or rejected.

Can you please clarify the matter.

I am expecting your valuable input and reply.

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Thanks & Regards
Biplab Pal
Welding Inspector

E-mail:   biplab.mech@gmail.com
 
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