jis g3302 98 a563. lfq commercial z120 steel coil zero spangle

  • jis g3302 98 a563. lfq commercial z120 steel coil zero spangle

  • Welders participating in the construction of jis g3302 98 a563. lfq commercial z120 steel coil zero spangle must pass the examination and perform welding within the validity period of the qualified items. Special operators such as on-site maintenance electricians, cranes, and shelf workers must hold job certificates. All oil pipelines need to use arc welding for bottoming and electric welding to ensure the welding quality. Oil tanks and process pipelines must be tested for non-destructive flaws in accordance with the flaw detection ratios and methods required by the design and acceptance specifications. The flaw detectors must be certified.

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Compared with 15Cr steel, 20Cr alloy has higher strength and hardenability. The critical hardening diameter in oil is 4-22mm, and the critical hardening diameter in water is 11-40mm, but the toughness is poor. This jis g3302 98 a563. lfq commercial z120 steel coil zero spangle alloy steel jis g3302 98 a563. lfq commercial z120 steel coil zero spangle still has a tendency to grow grains during carburization, and direct quenching at lower temperature has a greater impact on impact toughness, so secondary quenching is required after carburization to improve the toughness of the core of the part, and there is no temper brittleness.

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