China 
Africa 
Explore chapters and articles related to this topic
The Stainless Steels
Published in Mario Di Giovanni, Flat and Corrugated Diaphragm Design Handbook, 2017
Nitronic is the new family name given to Armco’s nitrogen-strengthened stainless steels. These new alloys, as well as others being developed, represent a significant metallurgical breakthrough. All of these stainless steels are essentially iron-based alloys of chromium and manganese that are nitrogen-strengthened. In addition, they contain varying amounts of nickel, molybdenum, columbium, vanadium, and/or Silicon to achieve the specific properties needed.
Influence of heat input on weld integrity of weldments of two dissimilar steels
Published in Materials and Manufacturing Processes, 2023
Anup Kumar Maurya, Chandan Pandey, Rahul Chhibber
On the other hand, nitronic steel is nitrogen strengthened ASS consisting of austenite with carbide precipitation at grain boundaries and annealing twins. It possesses better resistance to galling, corrosion resistance, good weldability, ductility, superior impact toughness, tensile strength, and enhanced intergranular corrosion properties, making it more efficient in seawater application than its former grades like stainless steel (SS) 304, 316, and 316 L.[8,9] With super duplex stainless steel, the main problems stated in the literature are deprivation of mechanical performance of the welded joint (WJ) and corrosion resistance, the possibility of deleterious intermetallic phase because of its sensitiveness toward heat when subjected to welding. However, multipass welding broke down the original microstructure of super duplex stainless steel by repeated heating causing metallurgical problems like δ/γ transformation, sigma (σ), chi (χ), R, and secondary austenite (γ2).[6,10–12] In welding, the ferrite/austenite ratio in super duplex stainless steel depends on the heat input, making it a crucial factor in altering the chemistry of weld metal on solidification. Heat input also controls the cooling rate, prevents heat and mass transfer, impacts the microstructural stability of the joint, liquid flow, and thermochemical responses. To achieve a more favorable phase balance, the transformation of δ/γ resulted from a slow cooling rate because of high heat inputs. It is thus desirable to have very accurate control on cooling rate and heat input applied during welding so that the aforementioned problems can be effectively prevented.[13,14]
Machinability appraisal of nitronic-50 under dry environment using uncoated carbide inserts
Published in Materials and Manufacturing Processes, 2023
Turning tests have been conducted upon cylindrical rods of Nitronic-50 (supplied by Amigo Impex, India) having dimensions ϕ70 mm × 500 mm in a heavy duty lathe (Model no. NH 26) manufactured by HMT Ltd., India. Nitronic-50 is also familiar as “22-13-5 stainless steel” due its major constituents apart from iron (56.721 by weight percentage) being in and around 22 chromium, 13 nickel and 5 manganese. Other important constituents (by weight percentage) of the alloy are molybdenum (2.270), silicon (0.438), copper (0.317), nitrogen (0.2) and niobium (0.111). Nitronic-50 has a melting point of 1450°C, hardness of 247 HV and a yield strength of 441.66 MPa.