It seems that there are a few companies with the name 汉邦. It is not necessarily the case that the company will opt for a simple pinyin transliteration of their name. They will sometimes modify the transliteration, probably as a way to distinguish themselves from other companies with the same Chinese name. For example, 江苏汉邦科技有限公司, has translated their name as "Hanbon Sci. and Tech", while 北京汉邦高科数字技术股份有限公司 has opted for a simple pinyin transliteration, "HANBANGGAOKE". Since I do not know which 汉邦 company you are referring to, I cannot give you a specific suggestion as to which is more appropriate. If a transliteration already exists on the company's website such as "Hanbon", I would use that to maintain consistency. However, if no such translation exists, I would stick with the more direct "Hanbang", unless otherwise directed by your client.

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Note added at 1 day53 mins (2012-07-23 13:39:20 GMT)
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I cannot think of other words that you could put in there aside from the direct pinyin transliteration. Humble is a pretty good one in terms of how well it matches the Chinese name. However, I feel like it creates somewhat of a contradiction because you are directly declaring in the name that the company is "humble", yet such a direct declaration seems the opposite of humble. So, even though humble is a complementary term, it does not seem to fit in this context. If you called the company "Hanbang Chemical Co., Ltd." or something to that effect, I think that would work just fine.