Ultralow hydrogen seamless submerged arc flux-cored wire for steel with yield strength being 690 MPa level

Abstract

The invention discloses an ultralow hydrogen seamless submerged arc flux-cored wire for steel with yield strength being the 690 MPa level. The submerged arc flux-cored wire is composed of a sheath and flux core powder. The sheath is made of a low-carbon steel strip. The flux core powder is prepared from, by mass percent, 8%-12% of marble, 4%-8% of fluorite, 25%-30% of metal nickel, 2%-4% of metal chromium, 7%-9% of ferromolybdenum, 12%-16% of electrolytic manganese, 1%-3% of ferrosilicon, 3%-5% of ferrotitanium, 2%-4% of ferro-boron, 2%-3% of potassium titanate, 1%-3% of potassium fluoride, 1%-3% of sodium fluoride and the balance ferrous powder. The ultralow hydrogen seamless submerged arc flux-cored wire for the steel with the yield strength being the 690 MPa level is high in moisture absorption resisting property, and excellent in processing property of being matched with fluorine and alkali sintered flux SR-SJ613, diffusible hydrogen is extremely low (smaller than or equal to 4 mL / 100 g), minus 40 DEG C charpy impact energy reaches over 100 J, and the wire can be applied to welding of a steel plate with the yield strength being the 690 MPa level in the ocean engineering field.

Description

technical field [0001] The invention belongs to the technical field of welding materials, in particular to an ultra-low hydrogen seamless submerged arc flux-cored welding wire for steel with a yield strength of 690MPa. Background technique [0002] With the rapid and sharp decline of onshore oil and gas resources, offshore oil and gas resources are gradually expanding from offshore to pelagic and deep sea. At the same time, marine engineering equipment used for oil and gas exploitation is also gradually developing in the direction of large-scale, high-parameterization, and lightweight. Steel plates with a yield strength of 690MPa have been widely used in the field of marine engineering equipment due to their high strength and good low-temperature toughness. The service environment of marine engineering equipment is generally relatively harsh, so the requirements for matching welding consumables for steel plates with a yield strength of 690MPa are relatively high. These wel...

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