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石油天然气行业标准SY/T 4078-1995<钢质管道内涂层液体涂料补口机补口工艺>在适用范围、焊口表面处理、现场施工过程及焊口补口涂层检验等部分都有不妥之处.成功的工程实例表明:无溶剂环氧树脂作为管线内壁涂层的补口涂料是非常合适的,它可以使传统的补口工艺更加科学、合理.为保证钢管内壁涂层的整体质量应尽快予以修订该行业标准.

关键词: 石油天然气 , 行业标准 , 管线 , 无溶剂环氧树脂 , 涂层

FORMATION OFδ-PHASE IN AUSTENITIC STEELS

YANG Ruzeng , DAI Qixun (Jiangsu University of Science and Technology , Zhenjiang , Jiangsu , China Manuscript received 10 January , 1995)

金属学报(英文版)

The relationship between the γ/(γ+δ) boundary temperature Tδ of austenitic steels and the equivalent weights of [Crl and [Ni] and the variation rule of the δ—phase volume with the temperature are studied With the aid of computer,the regressives expression derived from the experimental results are Tδ(℃) = T4 -21.2[Cr] +15.8[Ni]-223. Vδ(%)=0.715 exp 0.015(T-Tδ).

关键词: : austenitic steel , null , null , null

EXTRACTION KINETICS OF RARE EARTH (Ⅰ) A Constant Interfacial Cell with Laminar Flow

ZHENG Zhong , LI Deqian (Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun , China Manuscript received 23 January , 1995)

金属学报(英文版)

A technique was developed to study mass trans fer process and inter facial reaction in two phases system. This constant inter facial cell with a laminar flow was made into a cubic structure. The two fluids were continuously recycled and mixed. The concentration of each liquid could be monitored by two different methods. This kind of structure made both flows near the inter face flow parallel to the inter face. The inter face was smooth and steady. The mass trans fer rate could be judged by the linear velocity of the flows. The technique can be used for the analyses of the control step in both phases near the inter face in a diffusion control process. A preliminary hydrodynamics and mass trans fer study on the cell was presented, which ensures the distinguishing between a diffusion and a chemical reaction control process. A simplified mass transfer equation,N =0.5303D 1 /2* (Ci- Cb)* (V / B) 1/2, was achieved.

关键词: : constant inter face cell , null , null , null