Determination of Mechanical Properties of High Strength Linepipe

2008 ◽  
Author(s):  
Randy Klein ◽  
Laurie Collins ◽  
Fathi Hamad ◽  
Xiande Chen ◽  
Dengqi Bai
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
Tensile Specimen ◽  
Sampling Location ◽  
Noticeable Effect ◽  
Controlled Processes ◽  
Commercial Scale ◽  
The Difference ◽  
Thermal Coating

Commercial scale trials of X100 for Artic gas transmission pipelines have been conducted at IPSCO. Different alloying systems and thermo-mechanical controlled processes have been employed to make X100 coils. The coils were made into spirally welded pipes at IPSCO Spiral Mill in Regina, Canada. These pipes were tested in different conditions, namely as-welded, after hydro-testing, and after thermal coating. Therefore, the effects of as-supplied material and pipe-making processes on the final mechanical properties of pipe were evaluated. It was found that the tensile specimen size and sampling location had a noticeable effect on the testing results. The difference was also observed between the flattened strap specimen and round bar. The influence of the anisotropy of the as-supplied coils and the thermal coating on the final pipe properties will also be presented.

Study on Tensile Property and Strain Ageing Behavior of X100 Linepipe

2010 ◽  
Author(s):  
Yang Li ◽  
Weiwei Zhang ◽  
Shaotao Gong ◽  
Lingkang Ji ◽  
Chunyong Huo ◽  
...  
Keyword(s):  
Strain Curve ◽  
Tensile Specimen ◽  
Sampling Location ◽  
Stress Strain Curve ◽  
Long Distance ◽  
Noticeable Effect ◽  
Testing Method ◽  
Tension Tests ◽  
Tension Properties ◽  
The Difference

A series research programs and industrial trials of X100 linepipe have been launched by CNPC so as to build an X100 trial in China for long-distance gas pipeline in the coming years. In present paper, tests have been conducted on 20.6mm×1016mm diameter Grade X100 linepipe. The microstructures, tension properties will be presented. In order to investigate the influence of anti-corrosion coating process on the performance of pipe, strain aging tests in lab have been carried out as well. It is found that testing method, tensile specimen size and sampling location had a noticeable effect on the testing results. The difference is also observed between the flattened strap specimen and round bar. The influence of time, temperature and pre-strain amount of aging tests on the shape of S-S (stress-strain) curve, tension tests results, yield ratio of pipes are presented as well.

scholarly journals Effects of selected chemical admixtures on physical and mechanical properties of cement mortar

2020 ◽  
Vol 30 (3) ◽  
pp. 305-310
Author(s):  
SS Bethe ◽  
MN Haque ◽  
MR Islam
Keyword(s):  
Mechanical Properties ◽  
Cement Mortar ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Chemical Admixtures ◽  
Super Plasticizer ◽  
The Difference

This study was aimed to determination of appropriate dosage of selected chemical admixtures to reduce water cement ratio for mortar mix also to determine its effects on physical and mechanical properties of cement mortar. Amount of water used in concrete is very important for the physical and mechanical properties. Less amount of water increase the strength but reduce the workability. Water retarding admixture can reduce the water cement ratio with desired workability. In this experiment plasticizer (master pel 707) and super plasticizer (master polyheed 8632) was used. The used dosages of admixture were 0.5%, 1% and 1.5% according to cement weight. The test was done at 3 days, 7 days, 28 days and 91 days. 2.76″ cube mold was used for the work. The experiment was done to find the difference between with and without admixture used in mortar. Water used reduced with add of plasticizer and super plasticizer. In the experiment the workability of normal mortar and admixture used mortar remain same. The compressive strength is high for 1.5% super plasticizer used sample. So 1.5% super plasticizer is recommended for high strength. Progressive Agriculture 30 (3): 305-310, 2019

Research of reinforcement phase formation on the borders of sintered berillium grains

2020 ◽  
pp. 25-33
Author(s):  
A. V. Revutsky ◽  
V. Yu. Syrnev ◽  
V. Yu. Lopatin ◽  
O. V. Semilutskaya ◽  
T. A. Segeda
Keyword(s):  
Mechanical Properties ◽  
Grain Boundaries ◽  
High Strength ◽  
Beryllium Oxide ◽  
Research Problem ◽  
Strength Properties ◽  
Reinforcing Particles ◽  
Morphology And Structure ◽  
The Difference ◽  
Devitrification Mechanism

The paper presents the results of studying the effect of the state of grain boundaries (formed in the consolidation of beryllium powders by vacuum hot pressing on the strength properties of sintered beryllium. Scanning electron microscopy and X-ray spectral microanalysis were used to study the dependences of the morphology, elemental composition and structure of a dispersion hardening phase - beryllium oxide – on the content of low-melting impurities at the grain boundaries of sintered beryllium. A new hypothesis is proposed to explain the difference in the morphology and structure of reinforcing particles based on the transition features of amorphous beryllium oxide to a crystalline state (devitrification) at the grain boundaries of metallic beryllium. It is theoretically substantiated and experimentally confirmed that the devitrification mechanism can be homogeneous or heterogeneous depending on the content and ratio of silicon and aluminum impurities. This difference leads to the formation of either finely dispersed high-strength reinforcing particles of beryllium oxide or large, lower-strength oxide clusters. Changes in the morphology and structure of reinforcing oxide particles at the metallic beryllium grain boundaries, in its turn, influence the dynamics of beryllium microstructure grain growth during vacuum hot forming and, ultimately, the effect of dispersed grain-boundary hardening of sintered n beryllium. The paper provides the statistically processed results of testing the mechanical properties of industrial hot-pressed blanks produced of less than 56 μm powders to determine the effect of various factors (the content of impurities, their ratio and particle size of the initial powders) on the strength properties of hot-pressed beryllium. The adequacy of the obtained regularities was evaluated using the approximation confidence coefficients and confirmed the conclusions made in the theoretical and experimental analysis of the research problem. The statistical studies substantiated a comprehensive quality indicator of initial powders in order to predict the strength properties of hot-pressed beryllium. The results obtained substantiate new possibilities for controlling the mechanical properties of sintered beryllium for various purposes.

Change of Mechanical Properties of High Strength Line Pipe by Thermal Coating Treatment

2005 ◽  
Author(s):  
Yasuhiro Shinohara ◽  
Takuya Hara ◽  
Eiji Tsuru ◽  
Hitoshi Asahi ◽  
Yoshio Terada ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Volume Fraction ◽  
Uniform Elongation ◽  
High Strength ◽  
Secondary Phase ◽  
Longitudinal Direction ◽  
Dual Phase ◽  
Line Pipe ◽  
Thermal Coating ◽  
Production Conditions

In strain-based design, the overmatch condition in the girth weld portion primarily must be maintained. The pipes may also be required to have a low yield to tensile (Y/T) ratio and a high uniform elongation (U.EL) in the longitudinal direction to achieve a high compressive buckling strain. However, change in the mechanical properties by heating during coating treatment has not been paid attention so much. Furthermore, how much the mechanical properties change is affected by production conditions is unclear. This study aims to clarify firstly the relation between the mechanical properties (Y/T ratio, U.EL etc.) and the microstructure and secondly the change in mechanical properties by thermal coating treatment. The Y/T ratio and U.EL are affected by the volume fraction of ferrite and the secondary phase, which are changed by thermomechanical control processing (TMCP) conditions. For example, use of dual phase microstructure is very effective for decreasing the Y/T ratio and increasing the U.EL as the pipe. On the other hand, yield strength (YS) rises and the U.EL does not change after coating. The increase in the YS after coating is influenced by the microstructure and TMCP conditions. Resultantly, dependence of the Y/T ratio on the microstructure and TMCP conditions is reduced for line pipes after thermal coating treatment.

Effects of the Processing on Mechanical Properties of High-Strength Structural Steel HG785D

2017 ◽  
Vol 727 ◽  
pp. 76-81 ◽  
Author(s):  
Tie Ye ◽  
Zhi Wen Lu ◽  
Chun Hua Ma
Keyword(s):  
Mechanical Properties ◽  
Structural Steel ◽  
Ingot Mold ◽  
Steel Plate ◽  
High Strength ◽  
Heat Treatment Condition ◽  
The Difference ◽  
Steel Ingots ◽  
The Times ◽  
Copper Ingot

The steel ingots of high-strength structural steel HG785D were produced by using a special water-cooled copper ingot mold. It analyzed the reason of the slab to achieve rapid solidification and shrinkage reducing with the simulation by using AnyCasting software. The difference properties between 100mm and 240mm steel plate with the same components were studied. The results show that properties are better with the increasing of the compression ratio, the times of TMCP and the reduction. The properties of 240mm steel plate with different composition were studied under the same heat treatment condition. Niobium, vanadium and titanium are in favor of the mechanical properties, but have little effect on the plasticity of structural steel. It should increase the harden ability of the alloy elements to improve mechanical properties of the steel HG785D.

The Evolution and Determination of Mechanical Properties During the Manufacturing Process of High Strength Spirally Welded Pipe

2006 ◽  
Author(s):  
Xiande Chen ◽  
Laurie Collins ◽  
Fathi Hamad ◽  
Dengqi Bai
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Manufacturing Process ◽  
High Strength ◽  
Ring Expansion ◽  
Test Methods ◽  
Pipe Axis ◽  
Seam Welding ◽  
Welded Pipe

During the development of high strength and high toughness spirally welded pipe with improved weld heat affected zone toughness, the evolution of the mechanical properties were studied by testing at different stages of the manufacturing process. The mechanical properties were measured in the as-welded condition after the spiral seam welding, after the hydrostatic test and after the aging cycle simulating the external pipe coating process. The tensile properties of the pipe body in the transverse-to-pipe-axis (TPA) orientation, as required by the CSA Z245.1 and API 5L standards, were determined using different test methods and different specimen geometries, such as flattened strip specimen, non-flattened round-bar specimen and ring-expansion specimen. The investigation results provided some insights into the development of the mechanical properties of the final pipe products and the methods for more realistically and reliably determining the tensile properties of the pipe along the circumferential direction.

Validation of the Acceptability of 10x20 mm Specimens for Fracture Toughness Determination of High-Strength Steels

2013 ◽  
Author(s):  
Carey L. Walters ◽  
Lars O. Voormeeren ◽  
Michael Janssen ◽  
Kim Wallin
Keyword(s):  
Fracture Toughness ◽  
Size Effect ◽  
Cross Section ◽  
Base Material ◽  
High Strength Steels ◽  
High Strength ◽  
Transition Curve ◽  
Full Thickness ◽  
The Difference

Standards have traditionally required that fracture toughness specimens be the full thickness of the base material. However, this requirement may be unnecessary, especially if minimum specimen size dimensions based on plastic zone are met and the subsized specimens are statistically adjusted for the size effect. The current paper presents the results for full-thickness proportional Single Edge Notched Bending (SENB) specimens according to BS7448-1 that are 25 mm by 50 mm in cross-section and then compares these results to specimens of the same material that are 10 mm by 20 mm in cross section. The result is that for a temperature near the lower portion of the transition curve (−60°C to −70°C), the subsize specimens are in very good agreement. These results hold for two different loading rates. After correction for statistical size effect, the fracture toughnesses of the subsize specimens are within 10% of the full-size specimens. This is conservative. The difference is attributed to the statistical nature of fracture in the transition region.

Comparison of Refractory and Non-Refractory Components in Cement Composites after High Temperatures Load

2014 ◽  
Vol 1054 ◽  
pp. 33-36 ◽  
Author(s):  
Ondřej Holčapek ◽  
Pavel Reiterman ◽  
Marcel Jogl ◽  
Petr Konvalinka
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
High Alumina ◽  
Experimental Program ◽  
Cement Composites ◽  
Basalt Fibers ◽  
Temperature Load ◽  
The Difference ◽  
Strength In Bending

This article shows results of experimental program focused on determination of refractory and non-refractory components for cement composites and those influence on final properties. According to several research works from various universities strength and cohesion in general of common concrete rapidly decrease with temperature higher than 600 °C. To determine the difference between fire-resistance and common components four mixtures were designed. Non-refractory crushed nature silica aggregates and Portland cement compared to high alumina cement Secar®71 with crushed nature basalt aggregates were used. Combination of basalt fibers with two different lengths significantly improves. Basic mechanical properties tensile characteristics such as tensile strength in bending and compressive strength were examined on samples 40 x 40 x 160 mm. Exposure to 600 °C and especially 1000 °C in electric furnace for three hours simulated the high temperature load. Compared to silica aggregates together with Portland cement, where after1000 °C the composite is disintegrated with almost zero strength, the refractory components show considerably better parameters.

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