32results about How to "Good yield ratio" patented technology

The invention relates to a seamless flux-cored welding wire for high-manganese low-temperature steel of an LNG storage tank, which comprises a low-carbon steel strip sheath with a mass percentage of 60-70% and a flux core with a mass percentage of 30-40%. The core includes electrolytic manganese metal 65%-75%, nickel powder 8%-14%, silicon powder less than 1.0%, soda ash less than 1.0%, high-carbon ferrochrome 2%-8%, sintered powder 4%-8% , the rest is iron powder; the sintered powder includes 25%-30% of new potassium titanate, 20%-25% of alumina, 10%-15% of graphite, 25%-30% of magnesia, and the rest is binder . The welding wire can be used in the construction of LNG storage tanks, and has good impact toughness and strength matching the base metal at ultra-low temperatures; and the welding wire has good welding processability, and is suitable for welding in various positions. Matching chemical composition, smooth transition with base metal, no cracks.

The invention discloses a 304J1 austenitic stainless steel hot-rolled steel belt for deep drawing and a production method of the steel belt, which belong to the technical field of stainless steel. The 304J1 austenitic stainless steel hot-rolled steel belt comprises the following chemical components: 0.03%-0.07% of C, 0.40%-0.70% of Si, 1.80%-2.00% of Mn, not more than 0.045% of P, not more than 0.005% of S, 17.05%-17.35% of Cr, 6.02%-6.12% of Ni, 1.50%-1.60% of Cu, 0.03%-0.07% of N, and the balance of iron and inevitable impurities. By controlling the chemical components through smelting, and controlling the process in continuous casting, hot rolling and pickling, the stainless steel hot-rolled steel belt disclosed by the invention has relatively good mechanical performance.

The invention discloses a high-strength corrosion-resistant steel, wherein, in terms of mass percentage, the high-strength corrosion-resistant steel comprises: C 0.12-0.16%, Si 0.45-0.55%, Mn 4.50-5.50%, P≤ 0.008%, S≤0.0008%, Alt 0.01~0.05%, the balance is iron and unavoidable impurities. On the basis of limiting the specific chemical composition and content of the steel, the present invention has carried out extensive and in-depth research on the preparation process, so that the obtained high-strength corrosion-resistant steel not only has high strength, high toughness, and low yield strength. Ratio, high elongation, high hardness, high wear resistance, excellent bendability and good ductility, and also has significantly improved service life and safety.

The invention discloses a production method of a 830 MPa grade bainite high-strength finish-rolling reinforcement steel. The production method comprises the procedures of metallurgic steel making, steel rolling and heat treatment, wherein the steel making procedure adopts a vanadium and manganese microalloying technology; the steel rolling procedure adopts low-temperature control rolling; and the heat treatment procedure adopts a low-temperature tempering technology. In the smelting process, silicon manganese alloy and silicon iron are matched for alloying, and vanadium iron is used for vanadium microalloying; in the rolling process, the initial rolling temperature and the finish rolling temperature are reduced to guarantee the realization of refined crystalline strengthening and second phase dispersion precipitation strengthening so as to improve the strength; in the heat treatment process, the low-temperature tempering method is adopted; after the tempering is performed, a granular bainite / martensite complex phase structure is generated, and a small quantity of proeutectoid ferrites are synchronously generated; the reinforcement steel has high strength through the bainite / martensite complex phase structure; the plasticity and the toughness of the reinforcement steel can be effectively improved through the small quantity of proeutectoid ferrites; and excellent fitting between the strength and the plasticity of the reinforcement steel is guaranteed through a B / M+IF (a small amount) complex phase structure.

The invention discloses a hot-rolled pickling steel plate with a tensile strength of 600 MPa and low yield strength ratio, which mainly solves the mismatch between the punching performance and the hole expansion performance of the existing 600 MPa hot-rolling pickling steel plate, and cannot meet the requirements of manufacturing auto parts with complex shapes. Technical issues required. The hot-rolled pickled steel plate provided by the invention has the following chemical composition weight percentages: C: 0.06-0.08%, Mn: 0.8-1.2%, Si: 0-0.10%, P: 0-0.020%, S: 0-0.006 %, Alt: 0.015-0.050%, N: 0-0.005%, Ti: 0.03-0.05%, and the balance is Fe and unavoidable impurity elements. The yield ratio of the 2.0-4.0mm thick hot-rolled pickled steel plate of the present invention is ≤0.80, and the elongation after fracture is A 50mm 25-35%, and the expansion performance λ≥75%. The steel plate of the invention is used for making automobile structural parts.

The invention belongs to the technical field of welding materials, and in particular relates to a gas-shielded solid welding wire for ultra-high-strength construction machinery steel plates, which comprises the following components in terms of mass percentage: C: 0.08-0.12%, Si: 0.70-0.90%, Mn: 1.65-1.85%, Cr: 0.45-0.65%, Ni: 2.3-2.5%, Mo: 0.40-0.70%, Ti: 0.08-0.15%, Zr: 0.04-0.08%, Nb: 0.05-0.10%, B : 0.004~0.006%, S: 0.005~0.015%, P≤0.010%, the balance is iron and unavoidable impurities. The present invention also provides the application of the above-mentioned gas-shielded solid welding wire, which is used for welding ultra-high-strength engineering machinery steel plates with a tensile strength of 960 MPa. The weld seam formed by welding with the solid welding wire provided by the invention has the advantages of good low-temperature impact toughness, low yield ratio, high strength, and beautiful shape; and the welding spatter is small, and the welding process performance is excellent; the use of argon-rich (80%Ar+20 %CO 2 ) gas shielded welding, the yield ratio of the deposited metal is ≤0.9, which is suitable for the welding of ultra-high-strength engineering machinery steel plates such as Q890 with a tensile strength of 960MPa.

The invention relates to Cr-contained non-oriented electrical steel and a production method thereof, solving the problems that the better the magnetic performance, and the lower the yield ratio; and the poorer the process performance of a punching sheet, the more serious the edge magnetic deteriorating effect and the like existing in the inherent magnetic performance and process performance. The Cr-contained non-oriented electrical steel comprises the following chemical components in percentage by weight: 0.001-0.015 percent of C, 0.2-0.8 percent of Mn, 0.1-0.8 percent of Cr, 0.1-1.4 percent of Al, 0.1-0.9 percent of Si, not more than 0.08 percent of P, not more than 0.015 percent of S, not more than 0.008 percent of N and the balance of Fe and inevitable impurities, meanwhile, the requirement that the summation of Si and Al is 0.2-2.0 percent is met. The production method comprises the following steps of: smelting the clean steel by the process and continuously casting into billets; heating the billets; roughly rolling; finish rolling: controlling the accumulated rolling reduction rate of front four paths to 80-95 percent; coiling; naturally cooling to room temperature; acid washing, cold rolling, decarburizing, evenly heating; and cooling, coating and finishing according to the conventional process. The invention has the advantages of excellent inherent magnetic performance,high yield ratio and excellent process performance of punching sheet.

The invention discloses a high-strength steel plate for construction. The composition is designed as: C: 0.10-0.15%, Si: 0.25-0.45%, Mn: 1.40-1.60%, Ni: 0.04-0.06%, Ti : 0.005~0.02%, Cu: 0.35~0.60%, S≤0.004%, P≤0.01%, Alt: 0.03~0.06%, Nb: 0.03~0.05%, V: 0.03~0.05%, the balance is Fe and not available Avoided impurities; its yield strength ≥ 500MPa, tensile strength ≥ 650MPa, elongation ≥ 25%, yield ratio ≤ 0.40; the invention solves the problems of insufficient yield ratio and low temperature toughness of existing construction steel.

The invention discloses a J55 grade low-yield-strength-ratio resistance welding casing steel and a manufacturing method thereof. %, P: ≤0.015%, S: ≤0.008%, Nb: 0.01%~0.03%, Ti: 0.010%~0.030%, Cr: 0.30%~0.40%, Als: 0.02%~0.06%, N: ≤0.008 %, the rest is Fe and unavoidable elements, and the method is characterized by: the continuous casting slab is heated to 1160-1200°C by a heating furnace, the final rolling temperature of the first stage is greater than 980°C; the starting rolling temperature of the second stage is 980-1020°C , the final rolling temperature is 810-865°C; the rolled steel strip adopts laminar intermittent cooling, and the cooling rate is 12-18°C / s; it is coiled at 590-680°C. The advantages and effects of the present invention are: the carbon content is relatively Low, good weldability and impact toughness; appropriate amount of Cr alloy is added, the safety of the steel pipe is good, and the yield strength and tensile strength are guaranteed to meet the standard requirements.

The invention relates to a microbe germ composition, a cyanophyte biological germ leaven which contains the microbe germ, a cyanophyte fermentation nutrient, a cyanophyte biological organic fertilizerand a method for preparation, wherein the microbe germ composition contains plant lactobacillus, bacillus subtilis and swamp Rhodopseudomonas, the cyanophyte biological germ leaven is prepared by microbe germ composition and base, the cyanophyte fermentation nutrient is prepared by cyanophyte biological germ leaven and cyanophyte, the cyanophyte biological organic fertilizer is prepared by cyanophyte fermentation nutrient, organics base and water-loss reducer. The microbe germ composition is provided with the ability for fermenting solid cyanophyte, which can transform nutriment in the cyanophyte into the material for crops. The cyanophyte fermentation nutrient can be superior animal feed. The cyanophyte biological organic fertilizer is provided with crop pest control effect, which adds the soil organics content and improves nutrient utility to accelerate the plant growth belonging to natural superior organics fertilizer.

The invention provides a technical scheme of a control cooling method of an easy-welding high-performance steel plate. The easy-welding high-performance steel plate comprises the following chemical components in percentage by weight: 0.05-0.09% of C, 0.1-0.25% of Si, 1.55-1.65% of Mn, 0.025-0.035% of Nb, 0.025-0.035% of V, 0.20-0.30% of Cr, 0.0008-0.0025% of B, 0.020-0.045% of Alt, 0.015-0.030% of Ti and billet of which the low-welding crack sensitivity index Pcm is less than 0.21%; a final steel plate with the thickness of 12-60mm is rolled in a non-recrystallization area, and the effects of dislocations strengthening, precipitation strengthening and phase change strengthening in cooling after rolling are sufficiently realized by adopting different online cooling modes according to different performance requirements of the final steel plate; and the microstructure is controlled according to different performance requirements to obtain a proper complex-phase structure. According to the scheme, flexible control on performance is realized through the flexibility of the cooling technology by use of one component; the produced steel plate has uniform structure, low yield ratio, high plasticity and excellent low-temperature toughness; the steel plate does not need preheating before welding and heat treatment after welding; and the individualized needs of users are met by the flexibility of the production line.

The invention discloses an automobile hot rolled steel plate with the good broaching performance and the low yield ratio and a manufacturing method thereof. Steel comprises 0.03%-0.06% of C, 0.80%-1.50% of Si, 1.0%-2.0% of Mn, 0.02%-0.06% of Als, 0.50%-0.80% of Mo, 0.03%-0.06% of Nb, 0.02%-0.05% of V, less than or equal to 0.010% of P, less than or equal to 0.003% of S, and the balance iron and inevitable impurities. The manufacturing method comprises the steps of heating a plate blank to 1220-1250 DEG C and then conducting heat preservation for 1-2 h; keeping the total reduction rate of a non-recrystallization region greater than 90% and the finished rolling temperature at 750-800 DEG C; cooling a steel plate to 620-650 DEG C at the laminar cooling rate of 10-15 DEG C / s in the laminar cooling and rapid cooling mode after finished rolling, conducting rapid cooling at the cooling rate greater than 50 DEG C / s to 500-550 DEG C and then reeling the steel plate. The finished steel plate hashigh strength and good yield ratio and hoe expansion rate for matching and is suitable for an automobile chassis, a seat or other parts.

The invention discloses a seamless flux-cored welding wire for high-strength steel welding in marine engineering. The seamless flux-cored welding wire includes a low-carbon steel strip sheath and core powder, and the mass of the low-carbon steel strip sheath accounts for the total mass of the seamless flux-cored welding wire 80% to 90% of the core powder, the mass of the core powder accounts for 10% to 20% of the total mass of the seamless flux cored wire; wherein the core powder includes the following components in mass percentage: 43% to 48% of rutile, Quartz 1%~2%, sodium fluoride 1.2%~2%, potassium titanate 3.5%~5.5%, bismuth oxide 0.05%~0.1%, high carbon ferromanganese 8%~11%, nickel powder 5.5%~8.5% , rare earth ferrosilicon 3%~4.8%, magnesium powder 1.5%~3.5%, and the balance is iron powder. The seamless flux-cored wire is a seamless flux-cored wire for marine engineering high-strength steel. The weld formed by welding with the seamless flux-cored wire has excellent performance after heat treatment, has a good yield ratio, and has high impact at low temperature Toughness, the impact energy of the deposited metal is not less than 90J at ‑60°C, and can be applied to the welding of high-strength steel plates for marine engineering.

The invention discloses a marine high-strain welded steel pipe based on a double-phase structure and a preparing method thereof. The marine high-strain welded steel pipe is made by a wide and thick steel plate having the double-phase structure, the steel grade of the high-strain welded steel pipe is L485MO, the thickness is larger than or equal to 25.4mm, the width of the steel plate is pi(1-epsilon)D-2t, D refers to the outer diameter of the steel pipe, t refers to wall thickness, epsilon refers to a cold expanding rate, the radius-to-thickness ratio is smaller than or equal to 30, the yield-to-strength ratio Rt0.5 / Rm is smaller than or equal to 0.85, A is larger than or equal to 25%, and UEL is larger than or equal to 7%. The manufactured steel pipe has the characteristics of high strength, high tenacity, high strain capability, low yield-to-strength ratio, low strain aging influence, H2S corrosion resistance, large wall thickness, small radius-thickness ratio, high diameter precision, small outer diameter error and small out-of-roundness error, can fully meet the technical requirements of marine service on the high-strain thick-walled delivery steel pipe, can be used for deep-sea oil and gas exploitation and saves marine development cost.