The result of examing the thin - wall sphere in Zhong Yuan 140,000 Ton - Ethylene-Production-Per-Year project shows that curvature overproof results from the welding operation and heat treatment.

• 对国家重点项目中原年产14万吨乙烯工程的薄壁球罐的检验结果表明,发生曲率超标的原因是焊接操作与热处理存在问题。