River Ace60 River Ace70 River Ace80 Welten50 Welten60 Welten70 Welten80 Welten80C Welten 100N YAW-TEN 50 YAW-TEN 60 ZIRTEN 焊接结构用耐候钢 SMA400AW SMA400BW SMA400CW SMA400AP SMA400BP SMA400CP SMA490AW SMA490BW SMA490CW SMA490AP SMA490BP SMA490CP SMA570W SMA570P 日本标准性轧制钢 SPA-H SPA-C