日本采购需求：25x25角钢，50x50x5角钢，a36角钢，a36角钢，角钢，角钢40x40x4

I'm looking to gather more information regarding some metal products for an upcoming project. Specifically, I'm interested in the pricing details for various types of metal items, including metal sheets, angle bars, H-beams, and square bars. It would be helpful to know the available grades, dimensions, and any minimum order quantities, as well as lead times for production and delivery. Additionally, if you could provide any information on bulk discounts or pricing tiers based on order volume, that would be greatly appreciated. I'm aiming to place a sizable order soon, so insight into your payment terms and conditions would also be beneficial. Looking forward to your detailed response so we can proceed effectively!