DIN 11852德标卫生级不锈钢管尺寸表 DIN 11852-2000 食品和化学工业用阀门.不锈钢配件.焊合三通、弯头和异径接头 Valves for food and chemical industries - Stainless steel fittings - Tees, bends, reducers for welding-on
DIN 11852德标卫生级不锈钢管尺寸表