[Long] Yantai Steel manufacturers preferred specialty steel production Color Ronda Ronda Color Yantai is a specialized manufacturer of steel structures, perennial work experience summed up the following content, I hope you help you. In steel construction, high-strength bolts and even good or bad is an important factor affecting the quality of steel. In the winter construction should be noted that the need for negative temperature welding. Welders need to do some of their own training, to learn to master the negative temperature welding under the law, and the requirements of the specification needs more baking electrode, re-use after drying, so as to ensure the quality of the welding to ensure steel security structure. If you need to install steel structures, you can contact us. We are professional manufacturer of steel, contact details are as follows: Contact: Pan Jingli Mobile: 13573508938 Tel: 0535-7489672 Website: www.ytldcg.com place of business: Yantai Laishan Zhen road