Laser melting deposition of duplex stainless-steel coating on high strength low alloy pipeline steels for improving wear and corrosion resistance

2019 ◽  
Vol 9 (9) ◽  
pp. 1009-1016
Author(s):  
Xu Wang ◽  
Kaiping Du ◽  
Qiongyu Zhou ◽  
Ping Ou ◽  
Derong Zhang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Stainless Steels ◽  
High Speed ◽  
Electrochemical Impedance ◽  
High Strength ◽  
Duplex Stainless Steels ◽  
Phase Identification ◽  
Laser Melting ◽  
Pipeline Steels ◽  
Laser Melting Deposition

In this paper, a duplex stainless steels coating was successfully prepared on high strength low alloy (HSLA) pipeline steels by laser melting deposition. The microstructure and phase identification of the obtained coating were identified by scanning electron microscope (SEM) and X-ray diffraction (XRD). The tribological behavior and corrosion behavior were investigated by high-speed reciprocating friction and wear tester, polarization test, Eocp–t curves and electrochemical impedance spectroscopy (EIS). Results show that the obtained coating is bonded metallurgically with the substrate and comprises α, γ, M2B and (Fe, Cr)23C6 phase. In addition, the obtained coating shows nearly 22.5% improvement in wear resistance over the substrate and much better corrosion resistance due to its nobler open circuit potential (Eocp), corrosion current density (i corr) and bigger impedance value than the substrate, confirming that the laser melting deposited duplex stainless steels coating can be a promising candidate for the protective coating of HSLA pipeline steels.

Compatibility Evaluation for Application of Lean Duplex Stainless Steels to Seawater Systems in Nuclear Power Plants

2010 ◽  
Vol 654-656 ◽  
pp. 382-385
Author(s):  
Hyun Young Chang ◽  
Heung Bae Park ◽  
Young Sik Kim ◽  
Sang Kon Ahn ◽  
Kwang Tae Kim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Stainless Steels ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
High Strength ◽  
Duplex Stainless Steels ◽  
Stainless Steel 316L ◽  
Pitting Potential

Lean duplex stainless steels have been developed in Korea for the purpose of being used in the seawater systems of industries. The flow velocity of some part of seawater systems in nuclear power plants is high and damages of components from corrosion are severe. Therefore, this environment requires using high strength and high corrosion resistant steels. The newly developed lean duplex stainless steels STS329LD(20.3Cr-2.2Ni-1.4Mo) and STS329J3L(22.4Cr-5.7Ni-3.6Mo) are evaluated for the compatibility in seawater systems of nuclear power plants. In this study, the physical & mechanical properties and corrosion resistance of two alloys were quantitatively evaluated in comparison with commercial stainless steel 316L. Microstructures and mechanical properties of them were analyzed and the electrochemical properties related to corrosion resistance were measured such as pitting potential, passive current density, and corrosion rates from Tafel analysis. Critical pitting temperatures were measured in accordance with ASTM G48E method. The pitting initiation time and lifetime for replacement were predicted from the PRE values of test alloys and empirical equations that have been formulated from the condenser tubes of a nuclear power plant.

Duplex Stainless Steels: The Versatile Alloys

CORROSION ◽  
10.5006/3403 ◽  
2019 ◽  
Vol 76 (5) ◽  
pp. 500-510
Author(s):  
Roger Francis
Keyword(s):  
Corrosion Resistance ◽  
Stainless Steels ◽  
Oil And Gas ◽  
Austenitic Stainless Steels ◽  
High Strength ◽  
Oil And Gas Industry ◽  
Duplex Stainless Steels ◽  
Gas Industry ◽  
Corrosion Resistant ◽  
Corrosion Resistant Alloy

Duplex stainless steels were first manufactured early in the 20th century, but it was the invention of argon oxygen decarburization melting and the addition of nitrogen that made the alloys stronger, more weldable, and more corrosion resistant. Today, there is a family of duplex stainless steels covering a range of compositions and properties, but they all share high strength and good corrosion resistance, especially to stress corrosion cracking, compared with similar austenitic stainless steels. This paper briefly reviews the range of modern duplex stainless steels and why they are widely used in many industries. They are the workhorse corrosion-resistant alloy in the oil and gas industry. In this paper, their use in three industries common in Australia and New Zealand is reviewed: oil and gas, mineral processing, and desalination. The corrosion resistance in the relevant fluids is reviewed and some case histories highlight both successes and potential problems with duplex alloys in these industries.

scholarly journals Effects of low temperature aging on the mechanical properties and corrosion resistance of duplex and lean duplex stainless steels UNS S32205 and UNS S32304

2013 ◽  
Vol 66 (2) ◽  
pp. 193-200 ◽  
Author(s):  
Francis Gabriel Wasserman ◽  
Sergio Souto Maior Tavares ◽  
Juan Manuel Pardal ◽  
Fernando Benedicto Mainier ◽  
Ricardo Augusto Faria ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Low Temperature ◽  
Stainless Steels ◽  
High Strength ◽  
Tensile Tests ◽  
Decomposition Reaction ◽  
Heat Treatments ◽  
Duplex Stainless Steels ◽  
The Matrix ◽  
Critical Pitting Temperature

Duplex stainless steels (DSS) with austenite-ferrite microstructure are high strength and corrosion resistant steels frequently used as pipes and accessories in chemical/petrochemical on/and off-shore industries. Low temperature heat treatments (400-475ºC) may increase the hardness and wear resistance of duplex steels, due to a spinodal decomposition reaction of the ferrite, whose small particles α' precipitate in the matrix. In this work, several heat treatments at 400ºC and 475ºC with short duration (<24h) were performed on UNS S32304 and UNS S32205 grades. The kinetics of a' precipitation was studied by hardness measurements. Tensile tests were also carried out for some heat treatment conditions to evaluate the effect of the aging on the ductility of both grades. The hardening of duplex UNS S32205 was more intense than that of UNS S32304, although both steels have shown an interesting increase in tensile strength. Specimens of duplex steel heat treated at 475ºC for 4 h and 8 did not show any detectable decrease of corrosion resistance in anodic polarization and critical pitting temperature tests were carried out in NaCl media.

AK STEEL NITRONIC 30

Alloy Digest ◽  
2013 ◽  
Vol 62 (3) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Stress Corrosion Cracking ◽  
Stainless Steels ◽  
Abrasion Resistance ◽  
Atmospheric Corrosion ◽  
High Strength ◽  
Good Resistance ◽  
Temperature Performance

Abstract AK Steel Nitronic 30 has good wet abrasion resistance, good resistance to aqueous and atmospheric corrosion, high strength, economy, and improved stress-corrosion cracking resistance over common 18-8 stainless steels. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming and joining. Filing Code: SS-1138. Producer or source: AK Steel Corporation.

AL TECH 203EZ and 303EZ

Alloy Digest ◽  
1978 ◽  
Vol 27 (11) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Stainless Steels ◽  
High Speed ◽  
Heat Treating ◽  
Temperature Performance ◽  
Final Design ◽  
Mechanical Properties And Corrosion ◽  
Specialty Steel ◽  
Machining Operations ◽  
Machining Characteristics

Abstract AL Tech 203EZ and 303EZ are non-magnetic, austenitic, free-machining stainless steels specifically designed for use in high-speed, automatic machining operations. These modifications retain, in so far as possible, the good mechanical properties and corrosion resistance of the basic compositions which they represent. Sulfur or selenium is added to produce the free-machining characteristics. Data are typical; do not use for specification or final design. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-358. Producer or source: AL Tech Specialty Steel Corporation.

CYCLOPS BHT

Alloy Digest ◽  
1965 ◽  
Vol 14 (2) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Elevated Temperature ◽  
High Speed ◽  
High Speed Steel ◽  
High Strength ◽  
Heat Treating ◽  
High Load ◽  
Structural Components ◽  
Temperature Performance

Abstract Cyclops BHT is a low-alloy martensitic high-speed steel of the molybdenum type recommended for high strength, high load structural components designed for elevated temperature service. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-173. Producer or source: Cyclops Corporation.

CRUCIBLE 174 SXR

Alloy Digest ◽  
2009 ◽  
Vol 58 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Stainless Steels ◽  
Precipitation Hardening ◽  
High Strength ◽  
Heat Treating ◽  
Martensitic Stainless Steels ◽  
Excellent Corrosion Resistance

Abstract Crucible 174 SXR is a premium-quality precipitation-hardening stainless steel designed for use as rifle barrels. It is a modification of Crucible’s 17Cr-4Ni that offers substantially improved machinability without sacrificing toughness. Its excellent corrosion resistance approaches that of a 300 series austenitic stainless steel, while its high strength is characteristic of 400 series martensitic stainless steels. At similar hardness levels, Crucible 174 SXR offers greater toughness than either the 410 or 416 stainless steels which are commonly used for rifle barrels. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on forming and heat treating. Filing Code: SS-1034. Producer or source: Crucible Service Centers.

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