[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

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