Stress Corrosion Cracking of Stainless Steel Expansion Joint for Heat-Supply Network

2014 ◽  
Vol 577 ◽  
pp. 23-26 ◽  
Author(s):  
Feng Yang ◽  
Ning Zhang ◽  
Yang Song
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Heat Supply ◽  
Mechanical Characterization ◽  
Corrosion Cracking ◽  
Supply Network ◽  
Expansion Joint ◽  
Failure Region ◽  
Cause Of Failure ◽  
Transgranular Cracks

Tree-like transgranular cracks were found at the bottom of a expansion joint bellow that had been used for heat-supply network at 90°C and 0.8MPa. A failure analysis was conducted, including visual, microstructural, compositional, and mechanical characterization, to determine the cause and source of the degradation. Branched, brittle cracks were observed in the failure region and exhibited transgranular propagation. The results showed that the concentration of the chloride in the deposit was 248 ppm in the intermittent wet/dry cycles situation. It was determined that the likely cause of failure was neutral pH, Concentrated chloride-induced stress corrosion cracking.

Stress-Corrosion Cracking of Steels In Agricultural Ammonia

CORROSION ◽  
1962 ◽  
Vol 18 (8) ◽  
pp. 299t-309t ◽  
Author(s):  
A. W. LOGINOW ◽  
E. H. PHELPS
Keyword(s):  
Carbon Dioxide ◽  
Carbon Steel ◽  
Residual Stresses ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Air Contamination ◽  
Stress Relieving ◽  
Steel Tanks ◽  
Cause Of Failure

Abstract Stress-corrosion cracking has been determined as the cause of failure of carbon steel tanks in agricultural ammonia service. Effects of ammonia contaminants, such as air, water, carbon dioxide, oil, etc on failure rates were studied. In general, air contamination increased stress-corrosion cracking and water in small amounts inhibited the attack. For prevention of such failures, it was recommended that high residual stresses in ammonia vessels be avoided by the use of stress relieving treatments, that air be eliminated from agricultural ammonia systems and that the ammonia should have a minimum water content of 0.20 percent. 3.5.8

scholarly journals Failure Analysis of Industrial Discharge Hopper Pipe

2020 ◽  
Vol 5 (1) ◽  
pp. 1-6
Author(s):  
S. Rajole ◽  
P.R. Sondar ◽  
S. Hiremath ◽  
K.S. Ravishankar
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Microstructural Analysis ◽  
Fatigue Loading ◽  
Corrosion Cracking ◽  
Chlorine Content ◽  
Transgranular Fracture ◽  
Root Cause ◽  
Industrial Discharge ◽  
Cause Of Failure

This work presents the detailed investigation and root cause analysis of catastrophic failure of an industrial discharge hopper pipe. The hopper pipe investigated in the present work is made of austenitic stainless steel, 316 grade, a commonly used grade for valves, pipes and heat exchanger tubes. The pipe fractured in transverse direction, leading to the failure of discharge pipe. Visual inspection, dye penetrant test, chemical analysis, microstructural analysis, and fractography analysis were carried out on the failed part and it was concluded that stress corrosion cracking led to the failure of hopper pipe. The pipe constantly being under the exposure of industrial water and the presence of chlorine content in it made it susceptible for stress corrosion cracking. Transgranular fracture was clearly observed in the microstructure of failed sample and spot EDX at the fracture location confirmed the presence of chlorine content. Further, fractography showed striations indicating fatigue loading. The work concluded that stress corrosion cracking as the root cause of failure.  

scholarly journals ANALISA TERMOHIDROLIKA KERUSAKAN KONDENSOR ORTHO DICHLOROBENZENE TIPE SHELL DAN TUBE

2015 ◽  
Vol 11 (1) ◽  
Author(s):  
Bambang Teguh P. ◽  
Riki Jaka Komara
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Tube Sheet ◽  
Expansion Joint ◽  
Shell And Tube

Telah terjadi kerusakan pada sejumlah tube pada kondensor Ortho Dichlorobenzene (ODCB). Kondensor ODCB adalah jenis shell and tube tipe BEM, posisi vertikal, dengan expansion joint pada shell. ODCB mengalir di sisi tube dan air pendingin (CW) mengalir di sisi shell secara paralel dari atas ke bawah. Hasil uji material menyimpulkan bahwa kerusakan berupa Stress Corrosion Cracking (SCC) yang disebabkan oleh tegangan bengkok akibat ekspansi tube yang tertahan. Namun demikian, ternyata retakan tube terjadi tidak pada tengah-tengah bentangan panjang tube melainkan pada jarak sekitar 450 – 500 mm dari tube sheet, tidak jauh dari shell inlet nozlle. Tujuan studi ini adalah untuk mempelajari fenomena termohidrolika lokal yang menyebabkan kerusakan tube. Hasil simulasi menunjukkan pada jarak sekitar 450 – 500 mm dari tube sheet, CW di sisi shell mulai mendidih dan ODCB di sisi tube mulai terkondensasi. Uap air yang terbentuk mengisi ruang shell bagian atas. Proses pendinginan di zona ini menjadi sangat buruk dan mengakibatkan gradien temperatur dinding tube ke arah longitudinal cukup tinggi. Gradien temperatur yang tinggi menyebabkan kekuatan dinding tube menurun, sehingga saat ekspansi tube tertahan, tube akan bengkok pada zona tersebut.Kata kunci: Ortho Dichlorobenzene, kondesor, shell and tube, BEM, aliran paralel, SS 316 L, stress corrosion cracking, tube bengkok, kondensasi, pendidihan

Stress Corrosion Cracking of Admiralty Brass in Aqueous Copper Sulfate

CORROSION ◽  
1976 ◽  
Vol 32 (12) ◽  
pp. 469-471 ◽  
Author(s):  
T. R. PINCHBACK ◽  
S. P. CLOUGH ◽  
L. A. HELDT
Keyword(s):  
Stress Corrosion ◽  
Copper Sulfate ◽  
Stress Corrosion Cracking ◽  
Leading Edge ◽  
Corrosion Cracking ◽  
High Concentration ◽  
Sulfate Solutions ◽  
Scanning Auger Microprobe ◽  
Fractographic Features ◽  
Transgranular Cracks

Abstract Admiralty brass (Cu-Zn-Sn) is shown to be susceptible to stress corrosion cracking (SCC) in copper sulfate solutions. Fracture surfaces of the resultant transgranular cracks are characterized by cleavage like features. Surface analysis by scanning Auger microprobe revealed a high concentration of tin at the leading edge of the propagating stress corrosion crack. The fractographic features and the presence of tin suggest that hydrogen embrittlement may be involved in the cracking mechanism.

AMBRONZE 413

Alloy Digest ◽  
1969 ◽  
Vol 18 (6) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Surface Treatment ◽  
Stress Corrosion ◽  
Tensile Properties ◽  
Stress Corrosion Cracking ◽  
Electrical Contact ◽  
Heat Treating ◽  
Corrosion Cracking ◽  
Tin Bronze

Abstract AMBRONZE 413 is a copper-tin bronze recommended for plater's plates and electrical contact springs. It is relatively immune to stress-corrosion cracking. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Cu-201. Producer or source: Anaconda American Brass Company.

NICROFER 5716 HMoW

Alloy Digest ◽  
1985 ◽  
Vol 34 (11) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Stress Corrosion ◽  
Tensile Properties ◽  
Stress Corrosion Cracking ◽  
Crevice Corrosion ◽  
Corrosion Cracking ◽  
Low Carbon ◽  
Nickel Chromium ◽  
Corrosion Pitting

Abstract NICROFER 5716 HMoW is a nickel-chromium-molybdenum alloy with tungsten and extremely low carbon and silicon contents. It has excellent resistance to crevice corrosion, pitting and stress-corrosion cracking. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, machining, and joining. Filing Code: Ni-324. Producer or source: Vereingte Deutsche Metallwerke AG.

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