Fluorite-magnesium grain cored wire, application of fluorite-magnesium grain cored wire and production process for high heat input welding steel
A large heat input welding and production process technology, applied in the field of low-alloy steel manufacturing, can solve the problems of evaporation loss, precise control of Mg in difficult steel, strong oxidation reaction, etc., achieve high effect and utilization rate, and improve absorption time , The effect of refining the HAZ tissue
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Embodiment 1
[0032] A fluorite-magnesium particle cored wire with a diameter of 13mm, the cored wire includes an outer layer and a core; the outer layer is low carbon steel 08Al with a thickness of 1.0mm; the core is slow-release passivated magnesium particles, The core includes slow-release agent and passivated magnesium particles, the slow-release agent is fluorite, the slow-release agent accounts for 75% of the core content, and the passivated magnesium particles account for 25% of the core content. Passivated magnesium grains contain 92% magnesium, and the rest are passivating agents and unavoidable impurities.
[0033] The chemical composition and mass percentage range of the slow-release agent fluorite are as follows: CaF 2 : 90%, SiO 2 : 4%, CaO: 4%, S: 0.1%, H 2 O: 0.5%. The balance is unavoidable impurities.
[0034] The particle size of passivated magnesium particles is 0.5-3 mm, and the proportion of particle size ≤ 80 mesh is 4%.
[0035] Bulk density of core-coated slow-r...
Embodiment 2
[0044] A fluorite-magnesium particle cored wire with a diameter of 12mm, the cored wire includes an outer layer and a core; the outer layer is low carbon steel 08Al with a thickness of 1.0mm; the core is slow release passivated magnesium particles, The core includes slow-release agent and passivated magnesium particles, the slow-release agent is fluorite, the slow-release agent accounts for 75% of the core content, and the passivated magnesium particles account for 25% of the core content. Passivated magnesium grains contain 93% magnesium, and the rest are passivating agents and unavoidable impurities.
[0045] The chemical composition and mass percentage range of the slow-release agent fluorite are as follows: CaF 2 : 92%, SiO 2 : 2%, CaO: 3%, S: 0.1%, H 2 O: 0.5%. The balance is unavoidable impurities.
[0046] The particle size of passivated magnesium particles is 0.5-3 mm, and the proportion of particle size ≤ 80 mesh is 6%.
[0047] Bulk density of core-coated slow-r...
Embodiment 3
[0056] A fluorite-magnesium particle cored wire with a diameter of 11mm, the cored wire includes an outer layer and a core; the outer layer is low carbon steel 08Al with a thickness of 1.0mm; the core is slow-release passivated magnesium particles, The core includes slow-release agent and passivated magnesium particles, the slow-release agent is fluorite, the slow-release agent accounts for 75% of the core content, and the passivated magnesium particles account for 25% of the core content.
[0057] The chemical composition and mass percentage range of the slow-release agent fluorite are as follows: CaF 2 : 94%, SiO 2 : 3%, CaO: 2%, S: 0.2%, H 2 O: 0.3%. The balance is unavoidable impurities.
[0058] The particle size of passivated magnesium particles is 0.5-3 mm, and the proportion of particle size ≤ 80 mesh is 4%.
[0059] Bulk density of core-coated slow-release passivated magnesium particles is 1.3g / cm 3 .
[0060] The production method of steel for high heat input w...
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