Stress corrosion testing of welded supermartensitic. Experiences with supermartensitic stainless steels in the. The obtained results were compared with 18 results from the schaeffler diagram, equilibrium calculations and the scheil model in 19 thermocalc, and validated by using microscopy and nergy dispersive xeray 20 spectroscopy for chemical analysis on a cast ingot. Woollin p, understanding and avoiding intergranular stress corrosion cracking of welded supermartensitic stainless steel, proc conf corrosion 2007, nace international, paper 07094. Supermartensitic steel as an alternative to duplex steel twi.
The formation and stabilization of reverted austenite upon intercritical annealing was investigated in a x4crnimo1651 en 1. Page 19 experience with supermartensitic stainless steels. Hot deformation of martensitic and supermartensitic. Microstructure of cr super martensitic stainless steels after different heat treatments was studied by means of tem and xrd.
Phase transformations in welded supermartensitic stainless. In order to obtain sufficient toughness, even for the fairly benign ambient conditions in. Celant, pipe team p017 base material development 23 advances in the making and base material properties of supermartensitic stainless steels smss, patrick toussaint, jeanjacques dufrane, industeel. Localized corrosion susceptibility of supermartensitic. In terms of economy, supermartensitic stainless steels are cheaper and they are major replacements for more expensive duplex stainless steels required for tubing applications in the oil and gas. The new type of weldable martensitic stainless steel grades combine high strength, good corrosion. The supermartensitic stainless steels also known sometimes as weldable 12%cr steels, weldable %cr steels, low carbon martensitic stainless steels and soft martensitic stainless steels are steels with typically between 10%cr, carbon contents of the order of 0. Supermartensitic steels have good corrosion resistance in co 2 containing water solutions. The supermatensitic stainless steel, which has high mechanical strength and corrosion resistance, has the following composition, c. This study evaluates the effect of high n, ni, and ti contents on the microstructure and corrosion properties of a supermartensitic stainless steel when immersed in a 3.
This material gives protection to general corrosion. Proceedings of the asme 2003 22nd international conference on offshore mechanics and arctic engineering. Hot workability of 00crni5mo2 supermartensitic stainless steel. Effect of niobium on phase transformations, mechanical. The results show the formation of austenite in two stages. Nevertheless, they are often observed with various factors of the final mechanical properties. Lowcarbon supermartensitic stainless steel cr4nimo has substituted 12% cr for several decades, and more recently, ca15 steels in. Pdf development of a supermartensitic stainless steel. Pdf properties, weldability and corrosion behavior of. Smsscontaining more than % cr, and alloyed with ni, mo, nb, v, are considered to be a promising material for.
Experience with supermartensitic stainless steels in flowline applications stainless steel world 1999 kci publishing bv ssw99202 page 20 and weld metal. Microstructure of cr super martensitic stainless steel request pdf. Pdf the new class of supermartensitic stainless steels smss exhibits higher mechanical strength, corrosion resistance, and weldability properties. Issf martensitic stainless steels international stainless steel. Experience with supermartensitic stainless steels in flowline appli. Supermartensitic stainless steels smss are a new generation of martensitic stainless steels developed for a better corrosion resistance and toughness. Although it was a disadvantage that martensitic stainless steel was difficult to process because of its hardness, our company repeatedly conducted research and product development, produced all stainless kitchen knives made by integrating handle and blade in 1983.
An examination of the cp effect has therefore been performed both by statoil and other companies ref. In addition, specific stress corrosion cracking tests in a simulated production fluid are also reported and. A 16cr5nimo supermartensitic stainless steel was subjected to different tempering treatments and analyzed by means of permeation tests and slow strain rate tests to investigate the effect of different amounts of retained austenite on its hydrogen embrittlement susceptibility. The influence of austenitization treatment of a cr6ni2mo supermartensitic stainless steel x2crnimov52 on austenite formation during reheating and on the fraction of austenite retained after tempering treatment is measured and analyzed. Microstructure and properties of super martensitic stainless steel. Although easily joined by arc welding processes, the service life of the supermartensitic welded joint in corrosive environments relies to a large extent. In industrial production processes, the hardness and strength values of supermartensitic stainless steel are of the utmost importance. Past, present and future of weldable supermartensitic alloys. Designed in the early 90s, they serve as a low cost replacement for duplex stainless steels for offshore applications due to their lower.
Welding supermartensitic stainless steels for corrosive. Super austenitic stainless steels contain high levels of chromium and higher levels of nickel together with additions of molybdenum and nitrogen. The first generation of smss contained 11%cr, mo and ni additions1. The properties of supermartensitic stainless steel are achieved by quenching and tempering heat treatment after hot working. Information about the openaccess article microstructure and wear resistance of sprayformed supermartensitic stainless steel in doaj. The basic austenitic stainless steel is aisi 304l en 100881 x2crni 1911, material nr. Supermartensitic stainless steels 2002 conference papers.
Physical properties of martensitic stainless steels en. It offers a comprehensive property of high strength, ductility. Supermartensitic stainless steel microstruture in the asreceived condition. The stabilisation works by forming stable carbonitrides tic, n, thereby decreasing the carbon or nitrogen in solid solution and preventing the precipitation of chromium or molybdenum carbonitrides. The new class of supermartensitic stainless steels smss exhibits higher mechanical strength, corrosion resistance, and weldability properties when compared with conventional martensitic stainless steels.
Supermartensitic stainless steels smss are a new generation of the classical % cr martensitic steels, lower in carbon and with additional alloying of nickel and molybdenum offering better weldabilty and low temperature toughness. The 16cr5nimo steel class is characterized by a very low carbon content. An investigation of the significance of these factors for stress corrosion testing has been undertaken for a supermartensitic stainless steel. The results showed that the flow stress and the peak strain increase with the drop in the deformation. Martensitic stainless steel an overview sciencedirect. Martensitic stainless steels are a group of chromium steels ordinarily containing no nickel developed to provide steel grades that are both corrosion resistant and hardenable via heat treating to a wide range of hardness and strength levels. Supermartensitic stainless steels are martensitic steels with particularly low c and n. The corrosion properties of two supermartensitic stainless steels were studied in chloride and h 2 s environments. Therefore, the objective of this work was to assess the susceptibility to hydrogen cracking in gas metal arc welding gmaw with use of matching base and filler materials supermartensitic stainless steel, using the instrumented restraint cracking irc test. Supermartensitic stainless steels have recently been introduced in the oil and gas industries to substitute more expensive duplex stainless steels for onshore and offshore tubing applications. A 16cr5nimo supermartensitic stainless steel was subjected to different tempering treatments and analyzed by means of permeation tests and slow strain rate tests to investigate the effect of. Pdf formation and stabilization of reversed austenite in.
Supermartensitic stainless steel smss martensitic stainless steels are iron based alloys containing mainly alloying elements such as chromium, nickel and molybdenum. Supermartensitic stainless steels stainless steel world. Additionally the effect of cathodic protection cp was of major concern. Steel a whose chemical composition is reported in table 1, is a highly alloyed supermartensitic stainless steel stabilised by the addition of titanium. Determination of the critical pitting temperature of. Additionally, supermartensitic steel welded joints with a maximum hardness ranging from 282 to. The resultant microstructures of the three steels were tempered martensite with a reversed austenite. A typical microstructure consists of lowcarbon tempered martensite with high strength and toughness. Development of a supermartensitic stainless steel microalloyed with. The mechanical properties are usually controlled by chemical composition and thermomechanical treatments 9,10,11,12,14,15. Pdf hot workability of 00crni5mo2 supermartensitic. Supermartensitic stainless steels are known to be prone to hydrogen induced cold cracking. Several references have indicated that heat treatments have an effect on microstructures and properties of the supermartensitic stainless steel 1721.
Phase transformations in supermartensitic stainless steels. The deformation behavior of supermartensitic and martensitic stainless steels was investigated through compression test using gleeble3800 thermomechanical simulator within the temperature range of 900 1200 and the strain rates range of 0. Reference module in materials science and materials engineering, 2017. Specimens were abraded down to 600 grade emerging paper and rinsed with acetone. Effects of post weld heat treatments on the microstructure. Microstructure and wear resistance of sprayformed supermartensitic stainless steel presents lower hardness. The influence of niobium addition in a supermartensitic stainless steel with cr5ni2mo has been studied. Effect of carbon partition in the reverted austenite of. Super martensitic stainless steel smss includes a series of low carbon martensitic stainless steel. Microstructure evolution and orientation relationship of. The supermartensitic steel can replace more expensive duplex or austenite stainless steels in some environments. The results show that the filler metal and welding procedure combination affect the matching characteristics of the welded joint and their toughness and ductility properties. S9926efficientprocedures forwelding ll%crsupermartensitic stainless steel with duplex and superduplex stainless steelwelding consumables vannassau lhilkesj.
Woollin p, carrouge d, heat affected zone microstructures in supermartensitic stainless steel, proc conf supermartensitics 2002, kci publishing bv, paper 027. Supermartensitic stainless steels grades the new type of weldable martensitic stainless steel grades combine high strength, good corrosion resistance in sweet or mildly sour environments, and acceptable fracture toughness down to 40c. Hydrogen interaction with supermartensitic stainless steel. The result is a series of austenites, stronger than conventional 300 series stainless and with superior resistance to pitting, crevice corrosion, and stress corrosion cracking.
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