What are the differences between 19Mn6 and Q345R?

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19Mn6 is a type of steel plate used for boiler and pressure vessel applications; it represents the German standard for high-temperature structural steel. It is equivalent to the Chinese standard Q345R and the European standard P355GH. This steel plate, capable of withstanding high temperatures and pressures, is primarily used in the manufacture of drum sections for power plant boilers. It is produced in accordance with the DIN17155 standards, and its quality meets or even exceeds that of advanced foreign products. 19Mn6 refers to a steel grade that maintains its properties under high-temperature conditions, with local temperatures reaching up to 600°C, even when subjected to stress over time. I. Production process of 19Mn6: (19Mn6 container steel plates are available in stock; 19Mn6 steel from Wuhan Iron and Steel can be ordered via futures.) Electric furnace smelting – LF refining – VD vacuum treatment – mold casting – ingot heating – rolling – normalizing – tempering – flaw detection – steel plate cutting and inspection – storage. The 19Mn6 manufacturing method involves oxygen top-blown converter process, open-hearth process, or melting in an electric furnace. Upon consultation with the buyer, other equivalent methods may also be used; standard for 19Mn6: DIN17155 ； 19Mn6 – Heat-resistant steel plate for boilers and pressure vessels. III. Chemical composition of 19Mn6: Steel grade, Chemical composition (%): CSiMnPSAlCrMoCuNbNiTiV. For 19Mn6: 0.15–0.22, 0.30–0.60, 1.00–1.60, 0.035, 0.030, ≥0.020, ≤0.25, ≤0.10, 0.30, 0.010, 0.30, 0.030, 0.03. IV. Mechanical properties of 19Mn6: Steel grade, Thickness (mm); Upper yield strength ReH; Tensile strength Rm for thicknesses below (mm); Elongation at break (Lo=5d). ) The average value of the three specimens for the notched impact toughness test (ISO-V notch test) is ≤16>16 to ≤40>40 to ≤60>60 to ≤100>100 to ≤150≤60>60 to ≤100>100 to ≤150≤60>60 to ≤150≤60>60 to ≤150 Newtons/mm2 (minimum value); Newtons/mm2%; minimum at 0°C; minimum J value at +200°C. 19Mn6: 650, 490, 480; -650, -630, -630; 20, 20, 31, 31 – –. V. Applications of 19Mn6: 19Mn6 steel plates resistant to high temperatures and pressures are primarily used in the manufacture of drum sections for power plant boilers, with the product dimensions defined according to the standards of the European Coal and Steel Community, EURONORM 79. For all steel grades in the standards, their weight is calculated based on a specific gravity of 7.85 kilograms per cubic decimeter. The steel grades under this standard are: UHI, HI, HII, 17Mn4, 19Mn6, 15Mo3; they are usually processed by hot rolling or normalizing, while 13CrMo44 and 10CrMo910 are treated by normalizing or quenching and tempering. Relevant codes: (TRB) Technical Code for Pressure Vessels, TRD Technical Code for Steam Boilers, TRG Technical Code for High-Pressure Gases. If no test temperature is specified, the test shall be conducted at 300°C. For details on precautions regarding heat treatment and hot working, please inquire. Tensile strength: 350–630 N/mm2; yield strength: a minimum of 185–310 N/mm2; elongation: 17–25%; impact strength at 0–20°: a minimum of 27–31 J. Status: Normalized; the normalizing temperature for heat treatment is 890–950°C, while the stress-relief annealing temperature is 520–620°C.