Casting quality including the appearance of quality, intrinsic quality and quality in use. Quality refers to the appearance of the casting surface roughness, surface defects, size deviation, shape bias, weight deviation; mainly refers to the intrinsic quality of the casting of the chemical composition, physical properties, mechanical properties, microstructure and the presence in the cast of the interior holes, cracks, inclusions, segregation, etc; refers to the use of quality castings in different conditions of work endurance dock bollard products, including wear and corrosion resistance, spalling, fatigue, shock-absorbing properties and machinability, weldability and other process performance. Casting defects: cold resisting grain Other names: Splice (butt) pier bollard manufacturers, waterlines. Features: low temperature metal flow but each butt weld gap emerged, and irregular linear, non-penetrating and penetrating two dock bollard equipment, a trend in the role of external forces . Reason: a molten metal pouring temperature is low or the mold temperature is low. 2, alloy composition does not meet the standards, poor mobility. 3, sub-unit filled with liquid metal, fusion is bad. 4, gate unreasonable process is too long. 5, filling speed is low or poor venting. 6, lower than the pressure. Pier bollard price, Chen Hua machinery (Certified), pier bollard provided by China Machinery Equipment Co., Ltd. Qingdao Chen. Qingdao Hua Chen Machinery Co., Ltd. (www.qdchenhua.com) is Qingdao, a leader in CNC machine tools over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Chen Hua Machinery leadership in the staff warmly welcome all inquiries negotiations to create a better mechanical Chen Hua future.