Influence of Banded Structure on the Properties of Petroleum Pipe Steel and its Rating Analysis Method

2021 ◽  
Vol 1035 ◽  
pp. 492-498
Author(s):  
Ke Tong ◽  
Qing Liu ◽  
Bo Zhu ◽  
Shen Cong ◽  
Xu Ying Kang
Keyword(s):  
Pipe Steel ◽  
Pipeline Steel ◽  
Analysis Method ◽  
Banded Structure ◽  
Current Standards ◽  
Application Scope

The influence of banded structure on the performance of petroleum pipe was introduced firstly, and the characteristics and application scope of different rating methods of banded structure studied, and the banded structure in different specimens rated using this standards/methods. The banded structure rating of petroleum pipe steel requires proper and reasonable standards/methods for different microstructures. The current standards/methods could not integrate standard diagram comparison with calculation, and can not cover the banded structure rating for all pipeline steel microstructures. Therefore, in order to satisfy the inspection needs of petroleum pipe steel, a new rating standard is required to be established.

Toughness of X80 Grade Pipe Steel Girth Welds by Curved Wide Plate Testing

2016 ◽  
Vol 850 ◽  
pp. 873-880 ◽  
Author(s):  
Deng Zun Yao ◽  
Long Zhang ◽  
Yu Ran Fan ◽  
Tian Qi Wang ◽  
Yan Zhou
Keyword(s):  
Pipe Steel ◽  
Pipeline Steel ◽  
Test Methods ◽  
Test Results ◽  
Single Edge ◽  
Toughness Test ◽  
The Difference ◽  
Steel Welds ◽  
Girth Welds

To confirm pipeline designs and validate the weld toughness, extensively works of Curved Wide Plate (CWP) test methods was carried out. The method of Two Clip Gauge-CTOD was firstly introduced in CWP test in this paper. The test results of CWP analyzed by Two Clip Gauge-CTOD method and Compliance—J method was compared. The CTOD-R curves achieved by these methods showed the good consistence with each other. Furthermore, the difference of the test results among SENB(single edge-notched bend), SENT(single edge-notched tensile) and CWP was discussed. It shows that the toughness obtained by SENB is relatively conservative, and CWP and SENT are recommend to be chosen for pipeline steel welds toughness test.

Investigations of Fatigue Performance of S135 Drill Pipe Steel under Uniaxial Loading

2013 ◽  
Vol 716 ◽  
pp. 418-422 ◽  
Author(s):  
She Ji Luo ◽  
Rong Wang ◽  
Kang Zhao
Keyword(s):  
Regression Analysis ◽  
Fatigue Life ◽  
Linear Correlation ◽  
Pipe Steel ◽  
Drill Pipe ◽  
Uniaxial Loading ◽  
Analysis Method ◽  
Compression Loading ◽  
Cracks Propagation ◽  
S135 Drill Pipe Steel

The fatigue life of S135 drill pipe steel was investigated by means of tension-compression loading and torsion loading under uniaxial loading during the fatigue test. The quantitative formulas of fatigue life were obtained by regression analysis method, and the fatigue fracture mechanism was analyzed. The results show that a linear correlation was found between fatigue life and effective stress in the double logarithmic plots. Cracks initiated from the specimens surfaces under tension-compression loading as well as torsion loading. For the tension-compression fatigue and the torsion fatigue specimens, the main characteristics for cracks propagation were striations and sheares ripple marks, respectively.

scholarly journals A generalized meshing analysis method and its application to toroidal surface enveloping conical worm drive

2021 ◽  
Vol 13 (11) ◽  
pp. 168781402110630
Author(s):  
Chongfei Huai ◽  
Chunlin Chen ◽  
Yaping Zhao
Keyword(s):  
Mathematical Model ◽  
Reference Point ◽  
Unit Vector ◽  
Normal Vector ◽  
Analysis Method ◽  
Profile Angle ◽  
Toroidal Surface ◽  
Conical Worm ◽  
Worm Drive ◽  
Application Scope

A generalized method for the meshing analysis of conical worm drive is proposed, whose mathematical model is more general and whose application scope is expanded. A universal mathematical model, which can be conveniently applied to left-handed and right-handed conical worm pairs and their tooth flanks on different sides, is established by introducing the helical spin coefficient and tooth side coefficient of the conical worm. The pressure angle at the reference point, which is a key parameter for calculating the curvature parameters and lubrication angle, is determined based on the unit normal vector of the worm helical surface and is no longer determined by the tooth profile angle in the worm shaft section. The above improvement breaks away from the limitation of the classic meshing analysis method based on the reference-point-based meshing theory and thus expands its application scope. The toroidal surface enveloping conical worm drive is taken as an instance to illustrate the proposed method and the numerical example studies are conducted. The approaches to determine the reference point, the normal unit vector, and the curvature parameters at the reference point are all demonstrated in detail. The numerical results all manifest that the method presented in the current work is correct and practicable.

Effect of ferrite/pearlite banded structure on the local deformation and crack initiation at notches in pipeline steel

2020 ◽  
Vol 237 ◽  
pp. 107244 ◽  
Author(s):  
Xiaochuan Zhang ◽  
Yan Wang ◽  
Ning Guo ◽  
Yong Wang ◽  
Rui Li ◽  
...  
Keyword(s):  
Crack Initiation ◽  
Pipeline Steel ◽  
Local Deformation ◽  
Banded Structure

Research and Prospect on Relationship Between Microstructure Characteristics and Strength-Toughness of High Grade Pipeline Steel

2010 ◽  
Author(s):  
Ke Tong ◽  
Chuanjing Zhuang ◽  
Xiaodong He ◽  
Xinli Han ◽  
Juan Song
Keyword(s):  
Grain Size ◽  
Oil And Gas ◽  
Pipeline Steel ◽  
Rapid Development ◽  
In Situ Observation ◽  
High Grade ◽  
Banded Structure ◽  
Microstructure Characteristics ◽  
Effective Grain Size ◽  
Microstructure Characteristic

The strength property of high grade pipeline steel has been obviously improved with the rapid development of the constructing of oil and gas pipelines. And the excellent strength-toughness matching of pipeline steel is very important. The major affecting factor on strength-toughness of pipeline steel is microstructure characteristic. In this paper, the research status of pipeline steel microstructure characteristic including effective grain size, non-metallic inclusions and banded structure is summarized at home and abroad. In addition, the shortcomings of former research on the relationship between microstructure characteristics and strength-toughness are also analyzed for this pipeline steel. On this basis, a solution is put forward to investigate the characterization of effective grain size and micro-mechanical behavior of inclusions and banded structure with the method of electron backscatter diffraction and the method of SEM in situ observation. And the necessities and feasibilities of the solution are discussed.

scholarly journals Experimental Investigation of Fatigue Crack Growth Behavior in Banded Structure of Pipeline Steel

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1193 ◽  
Author(s):  
Nan Zhan ◽  
Zhengxing Hu ◽  
Xiaochuan Zhang
Keyword(s):  
Growth Rate ◽  
Fatigue Crack ◽  
Crack Growth Rate ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Pipeline Steel ◽  
Growth Behavior ◽  
Crack Growth Behavior ◽  
Fatigue Crack Growth Behavior ◽  
Banded Structure

The effect of a ferrite/mixed phase banded structure on the fatigue crack growth behavior of pipeline steel has been investigated in this work. Constant stress-controlled fatigue tests were carried out on unilateral notch specimens in the longitudinal direction (LD) and the transverse direction (TD). The strain accumulation was measured by digital image correlation (DIC) method and the fatigue fracture morphology was analyzed. The results show that the banded structure in the LD would cause a wide range of crack deflections, especially in the early stage of fatigue crack growth, which results in a lower fatigue crack growth rate compared to the TD. At the later stage, due to the increase of the plastic zone of the crack tip, more ferrite in the crack growth path of the TD specimen is also beneficial for crack tip blunting, thereby slowing down the increase of the crack growth rate.

Impact of analysis method on anthocyanin content of elderberry products

Planta Medica ◽  
2007 ◽  
Vol 73 (09) ◽  
Author(s):  
C Chrubasik ◽  
T Maier ◽  
M Luond ◽  
A Schieber
Keyword(s):  
Anthocyanin Content ◽  
Analysis Method
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