Technical specifications for Q345R(HIC) and Q345R(R-HIC)

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Technical specifications for Q345R(HIC) and Q345R(R-HIC) 1. Introduction to Q345R(HIC) and Q345R(R-HIC): Q345R(HIC) is a container plate of Q345R that has been tested for resistance to hydrogen-induced cracking, while Q345R(R-HIC) includes, in addition to the tests required for Q345R(HIC), SCC testing, that is, testing for stress corrosion caused by sulfides. The delivery conditions for Q345R(HIC) and Q345R(R-HIC) are normalizing, impact test at -30°C, and grade I flaw detection, with GB713-2014 as the reference standard for the manufacturing process. II. Dimensions, weights, shapes, and allowable tolerances of Q345R(HIC) and Q345R(R-HIC) 1. The dimensions, weights, shapes, and allowable tolerances of Q345R(HIC) and Q345R(R-HIC) shall comply with the provisions of GB/T709. 2. The thickness tolerance for Q345R(HIC) and Q345R(R-HIC) shall be in accordance with Class B tolerance specified in GB/T709. III. Smelting methods for Q345R(HIC) and Q345R(R-HIC): Q345R(HIC) and Q345R(R-HIC) are smelted using an electric arc furnace combined with secondary refining; a Ca treatment is carried out during the smelting process, and these steels should be essentially fine-grained, with an actual grain size of grade 5 or higher. IV. Chemical composition analysis of Q345R(HIC) and Q345R(R-HIC): C: ≤0.20; Si: 0.20–0.60; Mn: 1.20–1.36; Al: ≥0.020; Ca: 0.0015–0.0030; O: ≤0.004; CEV: ≤0.045.
V. Mechanical properties of Q345R(HIC) and Q345R(R-HIC):
For thicknesses of 8–16: Tensile strength Rm/Mpa (N/mm2): 510–640; Yield strength ReL/Mp (N/mm2): ≥345; Elongation A/%: 21; Impact test temperature/°C: -30; Impact energy KV2/J: ≥341.
For 80° bending test: Bending diameter: d=2a.
For thicknesses of 17–36: Tensile strength Rm/Mpa (N/mm2): 500–630; Yield strength ReL/Mp (N/mm2): ≥325; Elongation A/%: 21; Impact test temperature/°C: -30; Impact energy KV2/J: ≥341.
For 80° bending test: Bending diameter: d=3a.
For thicknesses of 37–60: Tensile strength Rm/Mpa (N/mm2): 490–620; Yield strength ReL/Mp (N/mm2): ≥315; Elongation A/%: 21; Impact test temperature/°C: -30; Impact energy KV2/J: ≥341.
For 80° bending test: Bending diameter: d=3a.
For thicknesses of 61–100: Tensile strength Rm/Mpa (N/mm2): 490–620; Yield strength ReL/Mp (N/mm2): ≥305; Elongation A/%: 21; Impact test temperature/°C: -30; Impact energy KV2/J: ≥341.
For 80° bending test: Bending diameter: d=3a.
For thicknesses of 101–150: Tensile strength Rm/Mpa (N/mm2): 480–610; Yield strength ReL/Mp (N/mm2): ≥285; Elongation A/%: 21; Impact test temperature/°C: -30; Impact energy KV2/J: ≥341.
For 80° bending test: Bending diameter: d=3a