Higher Nb content in SA516 Gr.70N

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zinmar77 Participant Join Date: Jan 2010 Posts: 1	Higher Nb content in SA516 Gr.70N 01/23/2010 11:50 PM
	As per ASME spec., Nb content shall be maximum 0.02% but up to 0.05% if purchaser and manufacturer agreed. What is the effect of Nb content between 0.02% and 0.05% and higher than 0.05%?
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Anonymous Poster	#1 Re: Higher Nb content in SA516 Gr.70N 01/24/2010 12:49 AM
	The detrimental effect of increasing Nb will be lower toughness (Charpy V-notch); which is more of a concern than the very small increase in strength that the extra Nb would bring. If in doubt - specify impact testing requirements.
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