Improving the low-temperature toughness of PPR pipe by compounding with PERT

2021 ◽  
Vol 28 (4) ◽  
Author(s):  
Yunqi Wu ◽  
Qian Ge ◽  
Feng Yang ◽  
Tong Wu ◽  
Ming Xiang
Keyword(s):  
Low Temperature ◽  
Low Temperature Toughness

Origin of low temperature toughness in a 12Cr-10Ni martensitic precipitation hardenable stainless steel

2018 ◽  
Vol 709 ◽  
pp. 1-8 ◽  
Author(s):  
C.R. Anoop ◽  
Aditya Prakash ◽  
S.V.S. Narayana Murty ◽  
Indradev Samajdar
Keyword(s):  
Stainless Steel ◽  
Low Temperature ◽  
Low Temperature Toughness

Development of X80M Line Pipe Steel for Spiral Welded Pipes With Low Temperature Toughness and Excellent Weldability

2014 ◽  
Author(s):  
Nuria Sanchez ◽  
Özlem E. Güngör ◽  
Martin Liebeherr ◽  
Nenad Ilić
Keyword(s):  
Low Temperature ◽  
Life Cycle Cost ◽  
Volume Fraction ◽  
Large Diameter ◽  
Pipe Production ◽  
Strain Accumulation ◽  
Long Distance ◽  
Line Pipe ◽  
Low Temperature Toughness ◽  
Welded Pipe

The unique combination of high strength and low temperature toughness on heavy wall thickness coils allows higher operating pressures in large diameter spiral welded pipes and could represent a 10% reduction in life cycle cost on long distance gas pipe lines. One of the current processing routes for these high thickness grades is the thermo-mechanical controlled processing (TMCP) route, which critically depends on the austenite conditioning during hot forming at specific temperature in relation to the aimed metallurgical mechanisms (recrystallization, strain accumulation, phase transformation). Detailed mechanical and microstructural characterization on selected coils and pipes corresponding to the X80M grade in 24 mm thickness reveals that effective grain size and distribution together with the through thickness gradient are key parameters to control in order to ensure the adequate toughness of the material. Studies on the softening behavior revealed that the grain coarsening in the mid-thickness is related to a decrease of strain accumulation during hot rolling. It was also observed a toughness detrimental effect with the increment of the volume fraction of M/A (martensite/retained austenite) in the middle thickness of the coils, related to the cooling practice. Finally, submerged arc weldability for spiral welded pipe manufacturing was evaluated on coil skelp in 24 mm thickness. The investigations revealed the suitability of the material for spiral welded pipe production, preserving the tensile properties and maintaining acceptable toughness values in the heat-affected zone. The present study revealed that the adequate chemical alloying selection and processing control provide enhanced low temperature toughness on pipes with excellent weldability formed from hot rolled coils X80 grade in 24 mm thickness produced at ArcelorMittal Bremen.

High Temperature Properties of Refractory Intermetallics

1990 ◽  
Vol 213 ◽  
Author(s):  
D.L. Anton ◽  
E. Hartford CT ◽  
D.M. Shah ◽  
Pratt Whitney ◽  
E. Hartford CT
Keyword(s):  
Solid Solution ◽  
Tensile Strength ◽  
High Temperature ◽  
Low Temperature ◽  
Ultimate Tensile Strength ◽  
Melting Temperatures ◽  
Structural Applications ◽  
Oxidation Resistant ◽  
Low Temperature Toughness ◽  
Niobium Solid Solution

AbstractOn the basis of creep strength, ultimate tensile strength and oxidation resistance, seven intermetallic compounds with melting temperatures above 1600°C have been selected as possible candidate materials for high temperature structural applications in advanced aero-turbines. These compounds, Nb3Al, Cr3Si, Co2Nb, Cr2Nb, MoSi2, Mo5Si3 and Nb2Al, have been evaluated and their properties reported herein. All seven of the compounds displayed excellent creep resistance at 1200°C with Mo5Si3 and Nb2Al being the strongest. Nb3Al, with the precipitation of the niobium solid solution displayed the greatest low temperature toughness. The greatest ultimate tensile strengths were observed for Co2Nb and MoSi2, while MoSi2 was by far the most oxidation resistant.

Research and Development of High Strength Architectural Heavy Plates

2012 ◽  
Vol 190-191 ◽  
pp. 590-594
Author(s):  
Ming Wei Tong ◽  
Ze Xi Yuan ◽  
Kai Guang Zhang
Keyword(s):  
Low Temperature ◽  
Large Scale ◽  
High Strength ◽  
Technical Requirement ◽  
Good Match ◽  
Iron And Steel ◽  
Fracture Transition ◽  
Fine Microstructure ◽  
Low Temperature Toughness ◽  
Base Plates

This paper provides a detailed description of high strength architectural heavy plates with 80mm in thickness developed at Wuhan Iron and Steel（Group）Corporation(WISCO). The chemical composition of plates contains mainly C-Mn-Nb-V-Ti with proper content of other alloys, and the thermal-mechanical controlled process and normalizing treatment were applied. The results show that the base plates manufactured at WISCO have a good match of high strength, good through-thickness characteristic, low yield ratio and low temperature toughness with fine microstructure, and the fracture transition temperature is about -40°C. The welding plate also has high strength and good low temperature toughness which comprehensively meet the technical requirement of large-scale architectural buildings.

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