Chemical composition of normalized container steel plate 20MnMoNi55, mechanical properties of 20MnMoNi55

Thread Content

20MnMoNi55 is a type of plate used for boilers and pressure vessels, and it is widely applied in industries such as petroleum, chemicals, power plants, and boilers. I. Chemical composition of 20MnMoNi55: (Wt%) – For ready-to-cut bars: 152*0375**0895
C Si Mn P S Ni Mo Al Cu V T Sn* As N*
0.15~0.25 0.10~0.35 1.15~1.55 ≤0.015 ≤0.012 ≤0.20 0.45~0.85 0.40~0.55 0.010~0.050 ≤0.15 ≤0.020 ≤0.030 ≤0.011 ≤0.025 ≤0.013
Note: N is determined through analysis of the finished product; Sn is a provided value. The steel plates are ultrasonically inspected one by one in accordance with SEL072. II. Mechanical properties of 20MnMoNi55: Tensile testing at room temperature; tensile testing at 300°C, Akv. (At room temperature, in J); 180° cold bending. 　　d=3.5a ReH(Mpa) Rm(Mpa) A(%) Rp0.2（Mpa） NT ≥450 570~740 ≥18 ≥390 Average ≥40 Single value ≥34 Perfect. 　　QT 590～760 Note: For steel plates with a thickness of >100 mm, delivered in the normalized + tempered condition, the mechanical properties are provided as measured values. III. Heat treatment of 20MnMoNi55: The specimens were subjected to a heat treatment process simulating that after welding, at 615±15°C for 10 hours. 20MnMoNi55 steel plate for boilers and pressure vessels is suitable for the production and inspection of steel plates with a thickness not exceeding 150 mm. The dimensions, shape, weight, and allowable tolerances of such steel plates shall comply with the provisions of standard GB6654-96. Applications of 20MnMoNi55: It is widely used in industries such as petroleum, chemicals, power generation, and boiler manufacturing, for producing equipment and components such as reactors, heat exchangers, separators, spherical tanks, oil and gas tanks, liquefied gas tanks, pressure vessels for nuclear reactors, boiler drums, liquefied petroleum gas cylinders, high-pressure water pipes in hydroelectric stations, and turbine casings. This product leaves the Wugang factory with grade 1 flaw detection. V. Delivery condition: normalizing, normalizing + tempering, quenching + tempering, high-temperature tempering, etc ； Technical requirements: flaw detection, performance requirements in the thickness direction for Z15-Z35 grades, as well as requirements for high strength and high toughness in these steel plates.