Group 1 - Shandong Taijia New Materials Technology Co., Ltd. and Shandong Taishan Steel Group Co., Ltd. have applied for a patent for a production method of a matte surface product made from 430 stainless steel for roofing tiles [1] - The patent application was filed on April 2025, and the publication number is CN120169830A [1] - The production method results in a stainless steel strip with a matte surface, uniform gloss, and a gloss level of 200-250 GU, along with stable mechanical properties [1] Group 2 - Shandong Taijia New Materials Technology Co., Ltd. was established in 2016, located in Jinan, with a registered capital of 800 million RMB [2] - The company has participated in 570 bidding projects and holds 27 patents [2] - Shandong Taishan Steel Group Co., Ltd. was founded in 1994, also located in Jinan, with a registered capital of 3 billion RMB [2] - The group has invested in 19 companies, participated in 5000 bidding projects, and holds 599 patents [2]