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I think the first question I need to ask you is the following Did you have a manual penalty in GWT? Did your rankings drop from algorithmically? Do you know exactly which updates you were effected by? (panda, penguin, top-heavy, layout...) What made you decide to disavow links? Did you even need to? One of the biggest mistakes I have seen many others do when their rankings drop is "panic" and start disavowing links. SEO'rs tend to run to the disavow tool when they may not even realize that their issues have nothing to do with that. Of course if you have a manual penalty they you have something to go by, but if you are effected from an algorithm change then you have some work ahead. I think the first step you need to do is try and figure out which update(s) you were effected by. That will give you a better idea where you need to focus your attention. Here is a great article that will help you to understand Once you get past that then here is an awesome article in which even helped me to recover, it takes some work but I promise it was the best thing I ever did.

What I am seeing for "Nickel Alloys" is the page for nickel alloys under neonickel.com (http://www.neonickel.com/alloys/nickel-alloys/). This page is optimized very well for this and Google thinks it is the most relevant page on your site, which it is. Even if this page has less authority than your homepage, the relevancy of this page is why Google is ranking this over the homepage. If someone is searching for nickel alloys and they get this page which is specifically about nickel alloys on your site, why would you not want them to land on this page? The artificial grass is an interesting case. I don't see that site in the first 5 pages of search but if I search only under that domain, the homepage is ranked near the bottom compared to all your other pages. Was this page possibly just resubmitted to Google via Webmaster Tools or removal of a noindex tag? Your homepage has good authority and relevance so there is no reason I'm seeing as to why it is not ranking. Has it ranked higher in the past and been a big change in organic traffic? Something I would definitely recommend is plugging in Webmaster Tools and check the crawl diagnostics there to see if you can get any insight. You should also submit a sitemap as well if you not have not already done so. This will help Google recognize all the pages on your site and increase the number of pages Google crawls. Hope this can help