Chemical composition of normalized nuclear power vessel steel plates 16MnHR; standards for 16MnHR

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16MnHR is a nuclear power steel, an ordinary-forging type of steel plate for pressure vessels, primarily used in manufacturing equipment such as steam generators for electrical use. The execution standard for 16MnHR is WYJ24–98. I. Chemical composition of 16MnHR (%): CSiMnPS – Melting analysis: ≤0.20, 0.20–0.60, 1.20–1.60; ≤0.025, ≤0.010. Finished product analysis: ≤0.22, 0.15–0.65, 1.10–1.70; ≤0.025, ≤0.010. Note: The residual contents of Cr and Ni in the steel shall not exceed 0.25% each, while the Mo content shall not exceed 0.20%. II. Mechanical properties of 16MnHR (properties after simulated post-weld heat treatment)
Test item, Test temperature (°C), Thickness of steel plate (mm), Tensile test: Room temperature 6–16, >16–36, >36, >60, >60, >100, >100–120; ób: 510–640, 490–620, 470; >600: 460, >590: 450–580; ós: ≥345, ≥345, ≥305, ≥285, ≥275; δ5%: ≥21; ￠%. Data provided: Akv (transverse) impact, J/cm²: Minimum average value 60, Individual minimum value 45; Minimum average value –20, Individual minimum value 26. Cold bending at 180 degrees: No cracks when d=2a, no cracks when d=3a.

III. High-temperature tensile properties of 16MnHR (properties after simulated post-weld heat treatment)
Thickness of steel plate (mm), MPa, Test temperature (°C): 200, 250, 300, 350, 400, 450. For thicknesses 21–36: ó0.2 ≥ 255, ≥235, ≥215, ≥200, ≥190, ≥180; For thicknesses >36–60: ó0.2 ≥ 240, ≥220, ≥200, ≥185, ≥175, ≥165; For thicknesses >60–100: ó0.2 ≥ 225, ≥205, ≥185, ≥175, ≥165, ≥155; For thicknesses >100–120: ó0.2 ≥ 220, ≥200, ≥180, ≥170, ≥160, ≥150