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As a new scarce clean resource, LNG has become a new hot spot in the world oil and gas industry. However, most of the welding materials used in storage tanks still rely on imports. After years of research and development and improvement, Harbin Weir Welding Co., Ltd. has successfully developed 9% Ni steel matching nickel-based wire submerged arc welding material SAW NiCrMo-4/SJ609 for LNG storage tanks. The research and development of welding materials mainly reduces the content of impurity elements such as sulfur and phosphorus in the welding wire through the design and optimization of the composition of the welding wire, thus improving the mechanical properties of the deposited metal, reducing the sensitivity of welding cracks and improving the crack resistance. Through the selection of flux slag system, the optimization of flux composition design breaks through the welding process problems such as indentation, poor straightness and excessive fluidity when submerged arc welding is in the transverse welding position. Through the comparison of welding test data and third-party evaluation data, the SAW NiCrMo-4/SJ609 developed by the submerged arc welding wire is comparable to imported welding materials in terms of welding process performance and mechanical properties, and has the ability to replace imported welding materials. At present, it has obtained the certification of many classification societies at home and abroad, such as CCS, DNV, BV, ABS and LR.
In order to solve the energy crisis in China, China has been building 160000 m3LNG storage tanks since 2004. The 9% Ni steel plate for storage tanks and the construction welding technology have already been localized, but the supporting nickel-based welding materials are still all imported. In order to solve the technical bottleneck of welding materials for LNG storage tanks and meet the needs of major national energy development, Harbin Weir Welding Co., Ltd. has successfully developed 9% Ni steel ENiCrMo-6 welding rods for LNG storage tanks after more than ten years of research and development work. The research and development of welding rod mainly carried out the determination of the basic slag system of the coating, the design optimization of the formula, the composition design and optimization of the weld metal, the optimization of welding process and so on. By optimizing the slag system and composition design, the impurity content of hydrogen, oxygen, nitrogen, sulfur and phosphorus in the deposited metal is reduced, the pore sensitivity is reduced, and the crack resistance is improved; the red tail phenomenon is successfully solved, which is suitable for large-scale welding, and the welding efficiency and utilization rate are improved. The manufacturability, mechanical properties and quality stability of the developed ENiCrMo-6 electrode are comparable to those of imported similar products, and have engineering application conditions. In summary, the process of the 9% Ni steel supporting electrode is excellent, and the comprehensive mechanical properties meet the design requirements of LNG storage tank. At present, it has obtained the certification of many classification societies, and has taken the lead in the domestic LNG land tank and ship fuel tank manufacturing projects.
A full range of low hydrogen welding rod, gas shielded welding wire, submerged arc welding wire/flux, excellent welding process performance, easy slag removal, arc stability, weld forming beautiful. The weld metal has high purity, low content of impurity elements S and P, excellent plasticity, impact toughness and resistance to HIC and SCC. Applicable to the higher requirements of Q245R(HIC), Q345R(HIC) steel pressure vessel and pipeline welding.
Can meet the different temperature -46 ℃ ~-101 ℃ test requirements. A full range of low-temperature steel electrodes, gas shielded welding wire, submerged arc welding wire/flux, excellent welding process performance, easy slag removal, arc stability, and beautiful weld formation. Stable mechanical properties, with good plasticity, low temperature toughness and crack resistance. It is suitable for welding pressure vessels, boilers, ships, bridges, high-pressure pipelines, offshore platforms and other structures. Such as ASME SA-516Gr.70, 16MnDR, ASME SA-203 Gr. A/B, 09MnNiDR, ASME SA-203Gr. D/E, 08Ni3DR, ASME SA-350Gr. LF3 steel, etc.
A full range of low alloy heat-resistant steel electrodes, gas shielded welding wires, submerged arc welding wires/fluxes, excellent welding process performance, stable arc, easy slag removal, and beautiful molding. The weld purity is high, the welded joint has good high temperature strength and low temperature toughness, and the comprehensive mechanical properties are excellent. It is suitable for 15CrMoR, 15CrMoR(H), ASME SA-387 Gr. 12 Class 2 steel large equipment and ASME SA-335 Gr. P12, SA-213 Gr. T12, 12 Cr1MoVR(1Cr-0.5Mo-0.25V) welding. 12 Cr2Mo1R, 12 Cr2Mo1R(H), ASME SA-387 Gr. 22 Cl.2 steel large equipment and ASME SA-335 Gr. P22 and SA-213 Gr. T22 pipe welding.
Can meet the strength level of 60~100kg performance requirements. A full range of high-strength steel electrodes, gas shielded welding wires, submerged arc welding wires/fluxes, excellent welding process performance, arc stability, easy slag removal, beautiful molding, stable mechanical properties of deposited metal. For the corresponding strength level requirements of hydropower, bridges, marine engineering, engineering machinery and other low alloy high strength steel structure welding.
Stainless steel categories include austenitic, martensitic, ferritic, duplex stainless steel, super austenitic stainless steel. A full range of stainless steel electrodes, gas shielded welding wire, submerged arc welding wire/flux, excellent welding process performance, arc stability, easy slag removal, beautiful molding, moderate ferrite control, good intergranular corrosion resistance and crack resistance, can meet different low temperature -196 ℃, -269 ℃ impact performance requirements. Mainly used in petrochemical, nuclear power, hydrogen storage, inner wall surfacing transition metal, carbon steel and stainless steel heterogeneous, stainless steel material welding.
Nickel-based alloys refer to a class of alloys with high strength and certain oxidation and corrosion resistance at high temperatures of 650 to 1000°C. The categories include Ni-Cu alloys, Ni-Cr alloys, Ni-Mo alloys, Ni-Cr-Mo(W) alloys, and Ni-Cr-Mo-Cu alloys. A full range of nickel-based electrodes, gas shielded welding wire, submerged arc welding wire/flux, excellent welding process performance, arc stability, easy slag removal, beautiful molding, deposited metal has good mechanical properties, corrosion resistance and excellent crack resistance. Can be used for nickel-based alloys, stainless steel and low-alloy steel dissimilar materials between the welding and steel surface surfacing.
Copper-based welding rod and gas shielded welding wire, excellent welding process performance, arc stability, easy slag removal, beautiful molding, deposited metal has excellent resistance to seawater corrosion, is widely used in ships, marine engineering and desalination projects.
It has excellent crack resistance, corrosion resistance and high strength. Excellent welding process, beautiful weld formation, arc stability, small spatter. Commonly used in offshore platforms, cryogenic vessels, shipbuilding, railway locomotives and automotive industry related to aluminum alloy welding.
Strip surfacing alloys include austenite, martensite, ferrite, dual phase steel, super austenite, carbon steel, nickel base, etc. Welding methods include: submerged arc welding (SAW) and electroslag welding (ESW). The flux process performance is good, the surfacing process is stable, the slag removal is easy, the surface of the weld bead is smooth, the fusion is good, and the dilution rate is low. Applicable to petrochemical, coal chemical, boiler, nuclear power and other equipment surfacing requirements.
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Harbin Ware Welding Co., Ltd. is one of the pillar industry companies affiliated to Harbin Welding Research Institute. It is a global open national high-tech enterprise integrating scientific research and development, production, sales and service.
