Boiler and Pressure Vessel Steel

Product Advantages

• Superior High-Temperature Strength and Creep Resistance

  Taking the medium-temperature hydrogen-resistant steel 15CrMoR as an example, the addition of chromium (Cr) and molybdenum (Mo) significantly improves the hardenability and thermal stability of the steel. In the medium-to-high temperature range of 450°C to 650°C, 15CrMoR maintains high creep strength and rupture strength. Its creep strength at 550°C is three times higher than that of ordinary carbon steel, ensuring equipment reliability under long-term high-temperature service. Its high-temperature performance is particularly outstanding, maintaining significantly higher yield strength and tensile strength than ordinary carbon steel at design temperatures of 550°C-600°C. The high-temperature allowable stress value serves as the core basis for engineers in calculating wall thickness of high-temperature equipment.

• Excellent Low-Temperature Toughness and Brittle Fracture Resistance

  Low-temperature pressure vessel steel achieves a uniform and fine grain structure through microalloying and heat treatment processes, maintaining good impact toughness at temperatures of -20°C to -70°C and even lower. This effectively prevents the risk of brittle fracture in equipment under low-temperature service conditions. For example, SA516Gr60 steel plate offers a combination of good impact resistance, minimal welding deformation, and high fatigue resistance, meeting service requirements at -20°C and lower temperatures.

• Reliable Corrosion Resistance

  Chromium forms a stable and dense Cr₂O₃ oxide film that effectively blocks hydrogen atoms from diffusing into the steel. Molybdenum significantly enhances the steel's resistance to hydrogen embrittlement and hydrogen-induced cracking, providing an extended service life in hydrogen-rich environments such as petroleum hydrotreating, coal liquefaction, and ammonia synthesis. Additionally, the low carbon equivalent and high-purity microalloying process enables grades such as SA516Gr60 to meet the NACE-MR0175 standard, passing HIC (Hydrogen-Induced Cracking) and SSC (Sulfide Stress Cracking) tests, demonstrating resistance to hydrogen sulfide corrosion.