2results about How to "Low carbon equivalent" patented technology

This invention provides a submerged arc welding wire suitable for high heat input welding of 50–150 kJ / cm and its application, belonging to the field of welding materials technology. The submerged arc welding wire provided by this invention comprises the following chemical composition: C: 0.07–0.12%, Si≤0.09%, Mn: 1.70–1.95%, P≤0.012%, S≤0.005%, Ni: 0.55–1.00%, Mo: 0.40–0.58%, Ti: 0.11–0.24%, Nb≤0.05%, V: 0.03–0.04%, Ca≤0.0015%, B: 0.0005–0.0045%, Ce≤0.030%, and the balance Fe. The submerged arc welding wire provided by this invention meets the requirements for the mechanical properties of the deposited metal at a heat input of 50–150 kJ / cm, and is applicable to the production of large welded structural components and high-efficiency welding manufacturing.

This invention discloses a high-strength, high-toughness steel for marine engineering equipment with excellent work hardening ability and its manufacturing method. The steel's chemical composition by weight percentage is: C = 0.08%–0.15%, Si = 0.10%–0.20%, Mn = 0.50%–1.00%, Ni = 0.30%–0.80%, Cr = 0.50%–1.50%, Mo = 0.10%–0.50%, Cu = 0.10%–0.50%, Nb or V = 0.02%–0.04%, and Al = 0.05%–0.08%. The composition is as follows: B = 0.0005%~0.0015%, Ti ≤ 0.01%, N ≤ 0.005%, P ≤ 0.010%, S ≤ 0.006%, with the remainder being Fe and unavoidable impurities. The technical solution of this invention adopts direct quenching after hot rolling and tempering heat treatment to obtain a multiphase structure of tempered martensite, restored ferrite and carbides. The work hardening rate during the deformation stage from yield strength to tensile strength is higher than 5000MPa, the yield strength ratio is lower than 0.90, the yield strength is higher than 690MPa, and the Charpy impact energy at -60℃ is higher than 150J.