Heat-resistant steel hand welding rod for ultra-supercritical CB2 steel and preparation method thereof

Abstract

The invention belongs to the technical field of welding rod preparation, and discloses a heat-resistant steel hand welding rod for ultra-supercritical CB2 steel and a preparation method thereof. The heat-resistant steel hand welding rod is composed of a special H08Cr9MoV alloy core wire (produced by Jiangsu Yonggang Group Co., Ltd.) with low content of impurities such as phosphorus and sulfur and a coating wrapping the surface of the special H08Cr9MoV alloy core wire. The main components of cladding metal are 9% of Cr, 1.5% of Mo, 1% of Co, 1% of Ni and 0.2% of V, and meanwhile, trace alloy elements such as Nb, N and B are added, so that the weld joint deposited metal has good mechanical properties, especially impact energy performance after heat treatment, and the impact energy is larger than or equal to 47J in a normal temperature state. The tensile strength of the deposited metal and a welding joint is 630-750MPa under the heat treatment condition of 730-740 DEG C and time of 12h. According to the hand welding rod manufactured by the method, electric arcs are stable in the welding process, splashing is small, welding slag is uniform in covering, slag removal is good, weld joint forming is attractive, all-position welding can be carried out, and the welding process performance is good.

Description

technical field [0001] The invention belongs to the technical field of electrode preparation, and relates to a heat-resistant steel hand electrode used for ultra-supercritical CB2 steel and a preparation method thereof; in particular, it relates to a new type of chromium-containing Cr ferrite resistant electrode used for 620°C ultra-supercritical A heat-resistant steel hand electrode for hot steel CB2 steel and a preparation method thereof. Background technique [0002] With the continuous development of my country's economy, the demand for electric energy is also increasing, and with the continuous improvement of the global awareness of environmental protection, the transformation of energy structure is also imperative. In this context, the task of China's energy transformation has been very clear, that is, to further adjust the energy structure and develop towards clean energy, to accelerate the development and utilization of clean energy, to build a new power system with ...

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Problems solved by technology

[0009] In order to solve the above problems, the invention provides a kind of heat-resistant steel hand electrode for ultra-supercritical CB2 steel; by adopting the special-purpose H08Cr9MoV alloy core wire transition main alloy elements with low impurity content such as phosphorus and sulfur, avoiding the hand electrode composition At the same time, the manufacturing process of hand welding rods is relatively easy. Taking the Φ4.0mm specification as an example, the processing diameter of hand welding rods is about Φ6.5mm. Hand welding rods with this size and diameter have good manufacturability

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