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Re: [MW:4981] about boron content in SA 516 grade 70 plates

By Materials & Welding
Hi
 
Since the effect of boron on the material properties & Weldability is still under research.
 
If you contact the IGCAR kalpakkam , you can get the exact answer.
 
There is some research is going on this chapter in IGCAR.
 
It is common understanding is effect of boron on steel is increases the Hardenability of steel ,but, still lot to reveal in this chapter.
 
Rgds,
 
K.Babu
Singapore
 
 
----- Original Message -----
From: Vikas Shah
Sent: Wednesday, April 28, 2010 4:14 PM
Subject: Re: [MW:4972] about boron content in SA 516 grade 70 plates

Dear Sir

With reference ur mail on nov 30 2009 you told that it is ok if it is upto 0.003% and what difference it make if there is boron in the plates is excessive amount can you give me any detailss weather it can be use or not or any thing related to this in astm books

 

Monday, November 30, 2009

[MW:3769] RE: SA 516 GR 70 plates-Boron content- clarification

Boron can significantly increase the hardenability of steel without loss of ductility. Its effectiveness is most noticeable at lower carbon levels. The addition of boron is usually in very small amounts ranging from 0.0005 to 0.003 %; usually fastener steels contain boron for hardenability. Check hardness?

Refer UG 10 if it is a div1 vessel "consideration should be given to making analyses for elements not specified in the specification but that would be deleterious if present in excessive amounts"

May be you can ask the plate mill, what is excessive amount?

From: Qamlr [mailto:qamlr@cicb-chemicon.com]
Sent: Monday, November 30, 2009 2:35 PM
To: materials-welding@googlegroups.com
Subject: SA 516 GR 70 plates-Boron content- clarification

 

Dear All

 

As per the SA 516 GR 70, boron content is not specified and shall not be present as specified element. For SA 516 GR 70 plate  manufacturer certifies that this element is within permissible limit

 

Kindly give your suggestions to what basis we can certify for Coded vessels being constructed

 

Also kindly brief as to why the presence of boron and its affect??

 

 

Thanks in advance & regards

 

Prashanth Hegde

Head Quality

Regards,
 
Vikas Dinesh Shah

 

----- Original Message -----
From: Qamlr
Sent: Wednesday, April 28, 2010 11:55
Subject: RE: [MW:4970] about boron content in SA 516 grade 70 plates

Dear Mr. Vikas

 

Boron requirement as an unspecified element  shall not exceed 0.0005 percent ( as per SA 941 under discussion chapter).

 

Regards

 

Prashanth Hegde

Head Quality

CICB-Chemicon Pvt. Ltd

 

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Vikas Shah
Sent: Wednesday, April 28, 2010 11:48 AM
To: materials-welding@googlegroups.com
Subject: [MW:4969] about boron content in SA 516 grade 70 plates

 

Dear Sir

 

 

Is boron allowed in the SA516 grade 70 plates upto 0.0014%

 

 

 

Regards,

 

Vikas Dinesh Shah

 

Sanghavi Bothra Engineering Co. Pvt. Ltd.
56, Kika Street, Gulalwadi,
Mumbai – 400004. India.
Mobile: +91-9821532896
Tel: +91-22-40416200 / Fax: +91-22-23452161
Direct Line: +91-22-40416223
E-mail - vikas@sbecpl.com
Website: - www.sbecpl.com

 

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