Ocean engineering steel plate EH40 suitable for high heat input welding and production method thereof
A technology of large line energy welding and marine engineering, applied in metal rolling, rolling force/roll gap control, temperature control, etc.
Pending Publication Date: 2022-05-13
NANYANG HANYE SPECIAL STEEL CO LTD
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[0003] The object of the present invention is to provide a steel plate EH40 for marine engineering suitable for high-energy-input welding and its production method, to solve the problem that the steel plate has a refined microstructure and maintains good impact toughness under high-energy-input welding conditions. The steel plate can adapt to the welding line energy of 300-550KJ / cm, and the impact toughness of the base metal and the heat-affected zone at -40°C is 90-150J
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[0012] The chemical composition of the steel plate is designed as follows in terms of mass percentage (unit, wt%): C: 0.06-0.09, Si: 0.05-0.25, Mn: 1.45-1.55, P≤0.020, S≤0.005, Nb: 0.030-0.060, V: 0.030-0.050, Ti: 0.01-0.04, Ni: 0.30-0.50, Als: 0.020-0.050, Cu: 0.15-0.35, Zr<0.05, others are Fe and residual elements, where the carbon equivalent Cev=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15, controlled at 0.34~0.42.
[0013] Its technological process is: molten iron pretreatment, top-bottom combined blowing converter, LF furnace refining, vacuum degassing treatment, billet cooling for at least 24 hours, heating, rolling, controlled cooling, straightening, stack cooling, finishing, external Inspection, flaw detection, storage. Specifically:
[0014] Hot metal pretreatment: after lime injection and stirring for desulfurization, ensure that the hot metal S is ≤0.005%, and at the same time take measures to keep the hot metal warm to avoid excessive temperature drop;
[0015] Converter smel...
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The invention discloses a production method of an ocean engineering steel plate EH40 suitable for high heat input welding. The ocean engineering steel plate EH40 comprises the following chemical components: C, Si, Mn, P, S, Nb, V, Ti, Ni, Als, Cu, Zr and the balance of Fe and residual elements. The production method comprises the steps of molten iron pretreatment, converter smelting, LF refining, VD refining, casting, heating, rolling, Acc controlled cooling and stack cooling. Through reasonable chemical component design, the LF + VD process and a reasonable inclusion control method are utilized to ensure the steel cleanness, and through effective implementation of heating, rolling, controlled cooling and other processes, the yield strength of the successfully developed steel plate is controlled to be 420-480 MPa, the tensile strength is controlled to be 550-600 MPa, the elongation is controlled to be 22%-28%, and the V-shaped transverse and longitudinal impact energy at the temperature of-60 DEG C is controlled to be 125-285J. According to the obtained steel plate, under the welding line energy of 300-550 KJ / cm, the impact toughness of base metal and a heat affected zone at the temperature of-40 DEG C is 90-150 J.
Description
technical field [0001] The invention belongs to the technical field of medium and heavy plate production, and in particular relates to a steel plate EH40 suitable for large heat input welding for ocean engineering and a production method thereof. Background technique [0002] EH40 belongs to the high-strength ship and marine engineering structural steel specified in GB / T712, and is widely used in oceangoing, coastal and inland water navigation ships, fishing boats and marine engineering structures. In recent years, China has become the world's largest shipbuilding country, and its shipbuilding volume accounts for one-third of the global shipbuilding industry. With the rapid growth of the shipbuilding industry, the demand for steel for offshore engineering is increasing year by year. In the traditional field of shipbuilding and ocean engineering, welding cost accounts for about 30%-40% of the entire manufacturing cost, and welding man-hour cost accounts for more than half of ...
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Login to View More IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14C22C38/08C22C38/06C22C38/16C22C33/06C21C7/06C21C7/00B21B1/46B21B37/74B21B37/58
CPCC22C38/02C22C38/04C22C38/12C22C38/14C22C38/08C22C38/06C22C38/16C22C33/06C21C7/06C21C7/0006B21B1/46B21B37/74B21B37/58
Inventor 许少普全微波李忠波朱书成刘庆波康文举袁永旗杨东杨阳薛艳生白艺波王勇朱先兴王希彬任义
Owner NANYANG HANYE SPECIAL STEEL CO LTD