The extension of hydrogen blister-crack array in linepipe steels

1978 ◽  
Vol 9 (11) ◽  
pp. 1581-1590 ◽  
Author(s):  
Makio Iino
Keyword(s):  
Linepipe Steels ◽  
Crack Array ◽  
Hydrogen Blister

Microstructural Control in Thick-Walled Nb-Ti-V Microalloyed Linepipe Steels

2004 ◽  
Vol 467-470 ◽  
pp. 223-228
Author(s):  
K.M. Banks
Keyword(s):  
Grain Size ◽  
Laboratory Simulation ◽  
Microalloyed Steels ◽  
Processing Parameter ◽  
Strip Rolling ◽  
Bearing Steels ◽  
Simulation Results ◽  
Linepipe Steels ◽  
Ferrite Grain Size ◽  
Microstructural Control

Various microstructure models for Nb-bearing steels were tested under industrial strip rolling conditions to establish a relationship between grain size and toughness in Ti-Nb-V microalloyed steels. For similar Nb contents, microstructure models for Nb steels were found to adequately describe recrystallisation kinetics in more complex Ti-Nb-V steels. For thick-walled linepipe (11.6mm), a minimum of 0.04%Nb is required to achieve adequate toughness. Retained strain was the dominant processing parameter factor affecting ferrite grain size. The predicted minimum amount of retained strain after the last pass required for sufficient grain refinement concurred with laboratory simulation results. For the rolling schedules investigated, metadynamic recrystallisation was predicted to occur during roughing, whilst static recrystallisation was predominant during finishing.

Failure Analysis of Hydrogen Corrosion of the Lens Gasket

2010 ◽  
Vol 37-38 ◽  
pp. 462-465
Author(s):  
Xiao Chun Ma ◽  
Guang Fei Xu
Keyword(s):  
High Pressure ◽  
Failure Analysis ◽  
Intergranular Crack ◽  
Optical Microscope ◽  
Corrosion Characteristic ◽  
Hydrogen Corrosion ◽  
Corrosion Depth ◽  
Fertilizer Plant ◽  
Inner Surface ◽  
Hydrogen Blister

The 10MoWVNb steel lens gaskets are widely used for the flange linking of high pressure tube in the synthetic ammonia system in chemical fertilizer plant. The gasket worked in H2-N2-NH3 environment at the temperature of 300°C. It often fails because of hydrogen corrosion. The microstructure and corrosion characteristic of the lens gasket were studied by optical microscope. The results showed that the hydrogen blister appeared preferentially at the interface of inclusions. The corrosion depth was 0.65 millimeter. There were little intergranular crack on inner surface.

Modification of inclusions in linepipe steels by Ca-containing ferrosilicon during ladle refining

2018 ◽  
Vol 47 (1) ◽  
pp. 6-12 ◽  
Author(s):  
Ming Li ◽  
Shusen Li ◽  
Ying Ren ◽  
Wen Yang ◽  
Lifeng Zhang
Keyword(s):  
Ladle Refining ◽  
Linepipe Steels
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