关键词: 不锈钢衬里复合管, 残余接触压力, 液压胀合, 自紧式密封, 本构方程, 锻造316L不锈钢, 高温高压水, 慢应变速率, 应力腐蚀

Abstract: The bimetallic CRA-lined pipe, which has an inner layer made of a very resistant CRA and an outer layer made of low-cost steel, is utilized in oil production, in nuclear power plants and in refining industry increasingly. A new kind of hydraulic expansion device of manufacturing bimetallic CRA-lined pipe is researched and developed. Based on the elasticity-plasticity theory, the stress and strain of the inner and outer pipe are analyzed theoretically during hydro-forming expansion process. By using deformation condition of compatibility the calculating formulas related hydro-forming pressure to the residual contact pressure between inner and outer pipe is derived. The theoretical analysis is verified by experimental results.

Key words: CRA-lined pipe, Hydraulic expansion, Residual contact pressure, Self-energizing seal, Constitutive equation, High temperature and high pressure water, Slow strain rate, Stress corrosion, Forged 316L stainless steel