美国采购需求：因科乃尔合金、哈氏合金、Inconel 718、Invar 36、Haynes 188、蒙乃尔合金

I'm looking for 50 blocks of various materials, each measuring 8"x8"x3.935" (with a tolerance of +/- 0.005). The required materials include a range of cast iron, high-performance alloys, and tool steels, each possessing specific hardness ratings. Please provide your best pricing, lead times, and any available certifications for these materials, as well as your capability to meet the required specifications. Looking forward to your prompt response!