45results about How to "Fully deoxygenated" patented technology

The production method of the pearlite matrix ultra-high strength ductile ductile iron crankshaft provided by the present invention selects low-sulfur and low-titanium pig iron, ordinary carbon steel and self-produced recycled iron as the main charge, and adds specific proportions of 75% ferrosilicon and 65% high-carbon manganese Iron, electrolytic copper and graphite-type recarburizers; smelted at a specific frequency in an intermediate frequency furnace, adding nodulizers, inoculants, silicon-calcium-manganese deoxidizers, and then tapped for nodularization. The nodularization process requires a specific tapping position, speed, and tapping The first step is to select a specific inoculant flow rate and total amount during the pouring process, and adopt a specific normalizing process for the crankshaft casting to prepare an ultra-high-strength ductile ductile iron material with a strength exceeding 1000 MPa, an elongation ≥ 5%, and a matrix material of pearlite type. Its comprehensive performance far exceeds that of ordinary ductile iron and ADI materials with the same tensile strength. The preparation method is applied to J4200 crankshaft, JX400 crankshaft and other parts to realize the preparation of ultra-high strength and toughness material with pearlite matrix, reduce the cost and obtain remarkable benefits.

The invention provides steel for a composite microalloying welding wire and a preparation method thereof. The steel is characterized by comprising the following chemical components in percentage by weight: no less than 0.06% and no more than 0.15% of C, no less than 0.81% and no more than 1.15% of Si, no less than 1.40% and no more than 1.85% of Mn, no less than 0.08% and no more than 0.15% of Ni, no less than 0.05% and no more than 0.15% of Cr, no less than 0.05% and no more than 0.15% of Mo, no less than 0.008% and no more than 0.012% of Ti, no less than 0.006% and no more than 0.030% of V, no less than 0.015% and no more than 0.025% of Nb, no less than 0.0005% and no more than 0.0030% of B, no more than 0.025% of S, no more than 0.025% of P, no more than 0.005% of O and the balance of Fe. The preparation method comprises the following steps of converting, ladle bottom argon blowing, LF refinement, fully-protected continuous casting, hot rolling and STELMOR cooling. The composite alloying provided by the invention is beneficial to refine molten drops, stabilize current and enhance the weld quality, and is beneficial to enhance the weld strength.

The invention provides a production device of a high-purity oxygen-free copper ingot billet. The device comprises a melting furnace, a partition bin and a heat preservation furnace which are sequentially communicated, the partition bin is further provided with a deoxygenator, the deoxygenator comprises a gas conveying pipe used for conveying deoxygenation gas and an air exhaust cover which is located in the partition bin and connected with the outlet end of the gas conveying pipe, and a plurality of air exhaust holes with the diameter of 0.5 mm to 1 mm are formed in the air exhaust cover; the melting furnace and the partition bin are connected through a liquid inlet hole, the air exhaust cover right faces the liquid inlet hole, and the distance between the air exhaust cover and the liquid inlet hole ranges from 10 mm to 40 mm; in the flowing direction of molten copper, the projection of the air exhaust cover is larger than the projection of the liquid inlet hole; the invention further provides a method capable of adopting the device for producing the oxygen-free copper ingot billet. By the adoption of the method, the oxygen-free copper ingot billet which is good in production compactness and low in oxygen content can be produced.

The invention discloses a seamless submerged arc flux-cored wire for steel with the yield strength being 550 MPa. The seamless submerged arc flux-cored wire is composed of a casing and flux core powder. The casing is a low-carbon steel strip. The flux core powder is prepared from, by weight, 8%-10% of nickel powder, 3%-6% of ferro-molybdenum, 10%-14% of manganese metal, 6%-8% of rare earth ferrosilicon, 3%-5% of ferrotitanium, 1%-2% of ferrozirconium, 1%-3% of ferro-boron, 1%-2% of potassium titanate, 1%-3% of sodium fluoride, and the balance iron powder. The seamless submerged arc flux-cored wire is extremely high in moisture absorption resistance and is matched with fluoride-basic type sintered flux SR-SJ613, the technical properties are excellent, diffusible hydrogen is smaller than or equal to 5 ml every 100 g (based on a gas chromatographic method), the Charpy impact energy at minus 40 DEG C reaches 100 J or over, and the seamless submerged arc flux-cored wire can be applied to welding of steels plates with the yield strength being 550 MPa in high-end technical fields such as ocean engineering and naval construction.

The invention discloses a zero-defect high-quality cast steel part for nuclear power. The cast steel part is characterized in that the cast steel part is chemically composed of, by weight, 0.18% to 0.20% of C, less than or equal to 0.60% of Si, 0.60% to 0.80% of Mn, less than or equal to 0.02% of P, less than or equal to 0.015% of S, 1.35% to 1.50% of Cr, less than or equal to 0.50% of Ni, 0.90% to 1.10% of Mo, 0.20% to 0.30% of V, less than or equal to 0.025% of Sn, 0.08% to 0.12% of Zr, the balance Fe and unavoidable trace impurities. The invention further discloses a technology used for producing the cast steel part, and according to the technology, the cast steel part has no defects, is high in quality, and is good in abrasion resistance and corrosion resistance, and high in toughness when in the high-temperature environment, and therefore, the cast steel part is suitable for a nuclear power unit.

The invention discloses a high-strength casting of a mobile crushing station for mines and buildings. The high-strength casting comprises the following chemical components by weight percent: 0.15-0.35% of C, 0.50-2.50% of Si, Mn not larger than 2.5%, P not larger than 0.04%, S not larger than 0.02%, 0.3-0.5% of Cr, 0.4-0.6% of Ni, Mo not larger than 0.5%, Cu not larger than 0.2%, 0.25-0.35% of V, and the balance of Fe and unavoidable trace impurities. The invention further discloses a production process of the high-strength casting; the casting has good mechanical properties and wear and corrosion resistance, still has good toughness in low temperature conditions, and is suitable for the production of the mobile crushing station for mines and buildings.

The production method for improving the morphology of ductile iron graphite provided by the present invention, selects low-sulfur and low-titanium pig iron, carbon steel and returned iron as the main charge, and adds 75% ferrosilicon, 65% high-carbon ferromanganese, electrolytic copper and graphite recarburizer; After smelting at a specific frequency in an intermediate frequency furnace, adding nodulizers, inoculants, and SiCaMn deoxidizers, the iron is spheroidized. The nodularization process requires specific iron tapping positions, speeds, and iron tapping steps. The specific inoculant flow rate and total amount are selected during the pouring process. , can achieve pearlite matrix, mixed matrix nodular cast iron casting graphite to achieve spheroidization level 2 and above, the spheroidization rate reaches 93-99%, and the graphite spherical diameter is 7-level rounded graphite. The production method has simple processing technology, high reliability and low production cost.

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.

The method to pour residual hot steel sludge for recovery in steel production comprises: a. after casting, pouring the residual steel sludge into empty ladle; b. conveying the sludge to converter and tapping; c. refining; d. casting; repeating. This invention makes full use of the sulfur capacity and strong reducibility to absorb inclusion and improve liquid steel cleanness rapidly, overcomes the consumption for low-melting, and reduces pollution and cost.

A TC4 titanium alloy flux-cored welding wire and a preparation method thereof. The invention belongs to the technical field of welding material preparation. The purpose of the present invention is to solve the problem that most of the existing welding wires for titanium alloy welding are solid welding wires, but the preparation process of solid welding wires is complicated, the cost of formula adjustment is high, and the deposition efficiency of the obtained welding wires in the welding process is low and the moistening effect is low. Technical problems of wetness and poor spreadability. The flux-cored welding wire is prepared from a TA1 titanium alloy sheath and a flux core; the TA1 titanium alloy sheath is made of a TA1 titanium strip through reeling, drawing, and annealing; the flux core is made of vanadium powder, aluminum powder, molybdenum powder, Cobalt powder, nickel powder, copper powder, silicon powder and titanium powder are mixed. Preparation method: first clean the TA1 titanium strip, ball mill the core powder, then reel the TA1 titanium strip, fill it with the core powder, roll and reduce the diameter, and then conduct cold drawing to reduce the diameter of the drawing die to obtain the flux cored welding wire. The flux-cored welding wire of the invention can be used for TC4 titanium alloy welding, has good comprehensive mechanical properties, low content of diffused hydrogen in deposited metal, and high welding efficiency.

The invention belongs to the field of petroleum equipment manufacturing, and specifically discloses a medium-manganese low-carbon martensitic steel, which comprises the following components in terms of mass percentage: C: 0.18-0.21%, Si: 0.65-0.85%, Mn: 1.65- 1.85%, Cr: 0.9~1.1%, Mo: 0.5‑0.6%, Ni: 1.8~2.1%, V: 0.21~0.25%, S≤0.005% and P≤0.01%, the rest are iron and unavoidable impurities, Has high strength and toughness. The invention also discloses an ultra-deep well drilling rig suspension ring prepared by using the medium-manganese low-carbon martensitic steel, the diameter of which can reach 150 mm, and meets the use requirements of the ultra-deep well drilling rig suspension ring. The invention also discloses a preparation method of the suspension ring of the ultra-deep well drilling rig, which has low cost and short manufacturing period.