美国采购需求：卷材热轧、钢板、金属工业、工业卷材、钢铁制造、热轧钢

I'm looking for detailed information on seamless pipes for a potential purchase. Specifically, I would like to know about the various grades and sizes you offer, along with any certifications and standards that your products meet. Additionally, please provide the pricing structure, including bulk order discounts, and the lead times for delivery. If there are any relevant technical specifications or product catalogs available, I'd appreciate it if you could share those as well. Thank you!