抓住机遇,携手并进,发展我国大中口径长输管线用直缝埋弧焊管

本文是宝钢（集团）公司赵昆在大中口径直缝埋弧焊管研讨会的发言。就宝钢建设宽厚板轧机的设想，建设方面的４个优势，地理优势，装备配套优势，原材料优势，技术开发优势作了论述。探讨了合作建设直缝埋弧焊管生产线的设想，并就进一步开发天然气管道专用管及高强度管线钢谈了看法，在实现三个设想的基础上，就宝钢发展直缝埋弧焊管的问题提出了设想。     

关于玻璃纵分碰角问题的探讨

探讨了浮法玻璃在冷端输送过程中,玻璃板在主线上纵向掰断并分开所产生的两块玻璃尾端碰角的现象.分析了在实践中尽可能避免碰角所采取的几种方式,并作了相应的对比.     

Efficient evolution of unpolarized and polarized parton distributions with QCD-Pegasus

The Fortran package QCD-Pegasus is presented. This program provides fast, flexible and accurate solutions of the evolution equations for unpolarized and polarized parton distributions of hadrons in perturbative QCD. The evolution is performed using the symbolic moment-space solutions on a one-fits-all Mellin inversion contour. User options include the order of the evolution including the next-to-next-to-leading order in the unpolarized case, the type of the evolution including an emulation of brute-force solutions, the evolution with a fixed number nf of flavors or in the variable-nf scheme, and the evolution with a renormalization scale unequal to the factorization scale. The initial distributions are needed in a form facilitating the computation of the complex Mellin moments.

Program summary

Title of program: QCD-PegasusVersion: 1.0Catalogue identifier: ADVNProgram summary URL:http://cpc.cs.qub.ac.uk/summaries/ADVNProgram obtainable from: CPC Program Library Queen's University of Belfast, N. IrelandLicense: GNU Public LicenseComputers: allOperating systems: allProgram language:Fortran 77 (using the common compiler extension of procedure names with more than six characters)Memory required to execute: negligible (<1 MB)Other programs called: noneExternal files needed: noneNumber of lines in distributed program, including test data, etc.: 8157Number of bytes in distributed program, including test data, etc.: 240 578Distribution format: tar.gzNature of the physical problem: Solution of the evolution equations for the unpolarized and polarized parton distributions of hadrons at leading order (LO), next-to-leading order and next-to-next-to-leading order of perturbative QCD. Evolution performed either with a fixed number nf of effectively massless quark flavors or in the variable-nf scheme. The calculation of observables from the parton distributions is not part of the present package.Method of solution: Analytic solution in Mellin space (beyond LO in general by power-expansion around the lowest-order expansion) followed by a fast Mellin inversion to x-space using a fixed one-fits-all contour.Restrictions on complexity of the problem: The initial distributions for the evolution are required in a form facilitating an efficient calculation of their complex Mellin moments. The ratio of the renormalization and factorization scales μr/μ has to be a fixed number.Typical running time: One to ten seconds, on a PC with a 2.0 GHz Pentium-IV processor, for performing the evolution of 200 initial distributions to 500 (x,μ) points each. For more details see Section 6.     

大型直缝焊管四点弯曲JCO成形及其弹复解析

提出了一种大型直缝焊管生产的新工艺--四点弯曲JCO成形,采用该工艺最终成形的管坯径向截面的几何形状为曲率一致的圆,且成形道次少,生产效率高。通过宽板四点弯曲试验,验证了理论解析的正确性,为将来实际生产中通过调整凸模行程控制成形管坯曲率提供了理论依据。理论和试验数据均表明弹复前后的曲率为线性关系,这为四点弯曲JCO成形过程智能化控制提供了便捷。基于上述理论进行了管坯四点弯曲JCO成形试验,获得了理想成形管坯,且成形道次仅13道次,相对传统工艺25道次,生产效率得到显著提高。     

大型直缝焊管三辊连续矫圆工艺

针对大型直缝焊管成形后存在的椭圆度过大和截面畸变等问题,提出一种新的三辊连续矫圆工艺.该工艺可分为三个阶段:加载阶段、辊弯矫圆阶段和卸载阶段.基于离散化的思想,建立大型直缝焊管辊弯矫圆阶段的一次静不定问题的力学模型,得到矫圆过程中管材的变形响应.模拟和理论计算结果表明,管材截面沿周向存在三个正向弯曲区域和三个反向弯曲区...     

热镀铝不锈钢电焊管的生产技术

介绍了用于汽车排气系统的镀铝不锈钢焊管的生产工艺和特点，对其进行耐高温腐蚀性实验，结果为：当镀铝层最度小于μｍ时，没有耐蚀性，当镀铝层厚度在５μｍ以上时，具有良好的耐蚀性。指出当焊缝处工作温度在２５０℃以上时，其镀铝层厚度应达到５μｍ以上。     

阻水纱在金属铠装光缆中的应用

本文介绍了阻水纱的选用原则和使用阻水纱的光缆结构 ,工艺及性能 ,通过几种阻水结构的比较 ,说明了使用阻水纱的光缆具有性能可靠 ,工艺简单 ,成本低等优点     

舰船用无卤低烟阻燃纵向水密封电缆研究

对额定电压1kV及以下无卤低烟阻燃船用纵向水密封电缆的开发研究作了介绍,并对电缆纵向水密封性能进行了试验。     

钢管在气力垃圾输送工程的应用及其防腐方法

简单介绍了气力垃圾输送管道的种类和材料。重点介绍了几种不同材质和工艺的钢管及其适用范围,并对其进行了比较,指出了螺旋焊管和直缝焊管各自的特点和优势;详细阐述了埋地气力输送钢管的土壤腐蚀类型及比较常见的防腐方法,重点介绍了目前已在气力输送工程中实际应用的3PE防腐、环氧涂层防腐和阴极保护防腐的工艺流程和特点;最后提出了气力垃圾输送管道应用中存在的一些问题和展望。     

高频直缝焊管焊接质量的快速分析法

介绍了一种快速分析高频直缝焊接质量的方法酸洗试验。