... treatment:Galvanized 3.Delivery time:Usually within 25 days Z Type Steel Purlin Specifications:Secondary MembersPurlins & Girts(Minimum Yield Strength ... Material in China :1. Han steel, SGH 340 ( >= Q235B), SGH 440 ( >= Q345B)2. Bao steel , Q235B, Q345 B.3. Xin ... Dao Q235B, Q345 B. Applications: Steel structure houses, ceiling board, roof structure applied in building engineering ...