101results about How to "Uniform elongation" patented technology

The invention relates to a steel used for a solid expandable casing of an oil and gas well and a manufacturing method of the expandable casing, which are applied to prepare the expandable casing of the oil and gas well in oil and gas industry. The steel alloy material used for the solid expandable casing of the oil and gas well comprises the following components in percentage by mass: 0.1-0.3% of C, 1.5-3.5% of Mn, 1-2.5% of Si, 0.1-3% of Al, less than or equal to 0.010% of P, less than or equal to 0.005 % of S, 0.003-0.010% of Ca, less than or equal to 0.0007% of N and the balance of Fe. The preparation method comprises the steps of vacuum melting, continuous casting and homogenizing annealing; hot rolled plate coils are prepared via controlling rolling and cooling, and the hot rolled plate coils are used for producing straight seam resistance welded steel pipes; and expandable pipe materials can be obtained via two stages of isothermal heat treatment. Threads are processed at both ends of each steel pipe. The invention has the effects that the expandable casing has the characteristics of high uniform elongation, high plasticity, low yield strength, low yield ratio and the like before expansion, and has high strength, enough plasticity, good welding seam quality and performance after expansive deformation.

The invention discloses a manufacturing method of an X65 pipeline steel longitudinal submerged arc welded pipe for undersea use. The manufacturing process of the steel pipe comprises: edge milling, edge prebending, JCO moulding, prewelding, inside welding, outside welding, first ultrasonic inspection, first x-ray inspection, mechanical expanding, hydrostatic test, chamfering, groove machining, second ultrasonic inspection, second x-ray inspection, pipe end magnetic particle inspection and appearance quality inspection. The method of the invention makes each part of the X65 steel grade ongitudinal submerged arc welded pipe with a diameter of phi 762mm and wall thickness of 28.6-30.2mm has uniform deformation and performances in the process of JCO moulding; the method in the invention solves the problem that local heating of the steel pipe during welding results in severely reduced strength and toughness as well as elongation; the method provided in the invention also provides a solution to the problems of increased strength and reduced toughness and uniform elongation caused by work hardening during steel pipe mechanical expanding.

A high-strength cold-rolled steel sheet excellent in uniform elongation, including in percent by mass:

• • 0.10-0.28% of C;
  • 1.0-2.0% of Si; and
  • 1.0-3.0% of Mn,

and the structures of the same having the space factors below to the entire structure:

30-65% of bainitic ferrite;

30-50% of polygonal ferrite; and

5-20% of residual austenite.

The invention relates to a high-strength pipeline steel which comprises the following chemical components by weight percent: 0.01-0.12 % of C, 1.0-2.5 % of Mn, less than or equal to 0.6 % of Si, less than or equal to 0.0030 % of S, less than or equal to 0.015 % of P, 0.01-0.09 % of Nb, 0.0025-0.030 % of Ti, less than or equal to 0.08 % of Alt, less than or equal to 1.0 % of Mo, less than or equal to 1.2 % of Cu, less than or equal to 1.5 % of Ni, less than or equal to 1.2 % of Cr, less than or equal to 0.0030 % of B, less than or equal to 0.01 % of Ca, 0.001-0.010 % of N, and the balance being iron and unavoidable impurities. The steel is polygonal ferrite and bainite duplex structure. A manufacture method of the high-strength steel pipe comprises heating slab with a temperature of 1100 to 1250 DEG C, rolling a non-recrystallization region with a starting temperature of 750 to 920 DEG C and a terminating temperature of 720 to 840 DEG C, two-stage cooling under control with an ACC terminating cooling temperature of 200 to 580 DEG C and a cooling rate of 5 to 30 DEG C per second, and manufacturing the pipe by using a UOE technology with a compression rate of 0.1 to 0.5 % and a diameter-expanding rate of 0.5 to 1.5 %. The obtained steel pipe can meet demands of low yield ratio and high uniform elongation.

The invention provides an economical seamless oil well pipe for an expansion pipe and a manufacturing method thereof. The oil well pipe comprises the following chemical components in percentage by weight: 0.08 to 0.18 percent of C, 0.2 to 0.5 percent of Si, 0.6 to 1.7 percent of Mn, less than or equal to 0.012 percent of P, less than or equal to 0.005 percent of S, 0.04 to 0.15 percent of V, 0.01to 0.03 percent of Ti and the balance of Fe and inevitable impurities. A heat treatment process in the manufacturing method comprises the following steps of: incompletely quenching a hot-rolled seamless pipe, controlling the temperature of a heating furnace at 750 to 800 DEG C, keeping the temperature of the steel pipe in the range of 30 to 40 DEG C higher than Ac1 and 30 to 40 DEG C lower than Ac3 between the two phase regions of ferrite and austenite, performing calculation at the heat penetration speed of 1mm/min, preserving the heat of the oil well pipes for 10 to 60 min after the hot-rolled oil well pipes with different wall thicknesses reach the temperature of the furnace, and then cooling the oil well pipes at the speed of not higher than 0.2 DEG C per second. In the economical seamless oil well pipe and the manufacturing method thereof, the manufacturability and expandability performance of the steel pipe, the mechanical properties of the expanded steel pipe and the manufacturing cost are taken into account.

The invention provides a pressing filter plate for electroosmotic sludge high-dryness dewatering equipment. The pressing filter plate comprises a filter plate frame, filter cloth, a filter disc and sludge conveying concentric holes, wherein the front surface of the filter plate frame unidirectionally sinks to form a pressing filter chamber; the filter disc is arranged at the bottom of the pressing filter chamber; the filter cloth is arranged on the filter disc; a cathode conductive filter screen connected with a cathode copper row is arranged between the filter disc and the filter cloth; an anode plate is arranged at the back of the plate frame; a cavity into which liquid or gas can be charged is formed between the filter disc and the plate frame; a push plate device is further arranged between the cavity and the filter disc; the cavity consists of a drum membrane, an inner steel base plate and an outer steel base plate; and the drum membrane is arranged on the inner peripheries of the steel base plates. By charging water to pressurize the cavity, a sludge pressing pressure is increased; meanwhile, through the push plate device, the uniformity of a pressing force is ensured and whole-process pressing is achieved; therefore, the moisture content of the sludge is further reduced.

The invention discloses a flat plate for a high-plasticity thick-wall deep sea pipeline and a production method of the flat plate. The steel contains 0.030%-0.055% of C, 0.16%-0.30% of Si, 1.36%-1.65%of Mn, 0.04%-0.07% of Nb, 0.008%-0.025% of Ti, 0.11%-0.24% of Cu, 0.10%-0.20% of Cr, 0.015%-0.040% of Als, 0.0021%-0.0049% of N, smaller than or equal to 0.010% of P, smaller than or equal to 0.0015%of S, 0.0015%-0.0045% of Ca, smaller than or equal to 0.00015% of H, smaller than or equal to 0.0020% of O, smaller than or equal to 0.14% of Ni, smaller than or equal to 0.15% of Mo, 0.31%-0.50% ofMo+Ni+Cr+Cu, and the balance of Fe and inevitable impurities. The casting blank heating process is divided into four stages, and the rough rolling temperature is 1050-1150 DEG C. The total deformationrate is larger than or equal to 51%, and the finish rolling temperature is 800-890 DEG C. The final cooling temperature is 350-430 DEG C. A produced steel plate has good plasticity, low-temperature toughness and low yield ratio.

A method of manufacturing a cellulose/gelatin composite viscose rayon filament that is characterized by including a process in which a spinning process is carried out while a viscose spinning solution is mixed with a gelatin crosslinking solution, which makes it possible to produce a cellulose/gelatin composite viscose rayon having uniform strength and elongation without yarn disconnection.

The invention discloses an imitating handmade full-automatic raw twisted cruller production line which at least includes a horizontal reciprocating dough rolling device, an interval oil-water brushingcutting device, a stacking creasing device, a stretching device and a cutting device. A reciprocating dough rolling mechanism applies reciprocating rolling non-parallel to the conveying direction ona dough material to form a dough strip; the interval oil-water brushing cutting device brushes water and oil at intervals along the dough strip conveying direction and divides the dough strip into a plurality of dough strips; stacked two-layer dough strips are pressed for creasing through the stacking creasing device; the stretching device elongates the dough strips; and the cutting device cuts the elongated dough strips to form raw twisted cruller. According to the structural design of the imitating handmade full-automatic raw twisted cruller production line, full-automatic production is realized, the quality that the produced raw twisted cruller imitates hand-made raw twisted cruller is achieved, the produced raw twisted cruller are better than hand-made, the taste of the fried raw twisted cruller is the same as that of the hand-made, even better, and efficiency and high-quality production are achieved.

The invention relates to a preparation method of a J55-grade steel ERW (electric resistance welding) expansion pipe with high diameter expansion performance, belonging to the field of metal materials. The invention is characterized in that J55-grade steel expansion pipe steel is acquired at low production cost through reasonable alloy design, and is welded to make the pipe instead of the seamlesssteel pipe. The method comprises the following steps: heating a J55-grade steel expansion pipe to 1000-1150 DEG C, keeping the temperature for 30-60 minutes, and cooling in air to room temperature; heating the J55-grade steel expansion pipe to the temperature of 50-100 DEG C higher than the J55-grade steel expansion pipe steel AC3 point, keeping the temperature for 30-60 minutes, and cooling in air to room temperature; and finally keeping the steel plate at the two-phase region temperature of 700-750 DEG C for 30-60 minutes. The invention eliminates the microstructure difference between the base material and the weld zone, implements substantial conformity of properties at all parts of the pipe body, and acquires a uniform distribution ferrite. The content of the ferrite is high, and is approximate to the critical value under such conditions. The method is beneficial to eliminating the zonal structure of the material so as to refine the structure, eliminate some defects (such as voidsand the like) and enhance the uniform elongation rate, so that the J55-grade steel ERW expansion pipe has higher overall diameter expansion performance. The preparation method provided by the invention is simple; and the ERW expansion pipe is practical and economical.

Provided is a hot press member that is provided with all of the following properties: high strength, with tensile strength TS being 1,500 MPa or higher; high ductility, with uniform elongation uEL being 6.0% or higher; and excellent heat treatment curability, with yield stress YS increasing 150 MPa or more upon execution of a heat treatment (baking finish treatment). This hot press member is characterized by having a structure containing a prescribed component composition (specifically, a low C content of at least 0.090% and less than 0.30%, and a high Mn content of at least 3.5% and less than11.0%), a martensitic phase comprising 70.0 vol% or more, and a retained austenitic phase comprising 3.0-30.0 vol%, inclusive, and in that the dislocation density thereof is 1.0x10<16> m<2> or higher.

The invention discloses a 400-500Mpa grade high-uniform elongationhot rolled steel sheet and a manufacturing method thereof. The 400-500Mpa grade high-uniform elongationhot rolled steel sheet is prepared from the following components in percentage by weight: 0.04-0.08 percent of C, 0-1.6 percent of Si, 0.8-1.5 percent of Mn, smaller than or equal to 0.035 percent of P, smaller than or equal to 0.001 percent of S, 0.025-0.060 percent of Al, smaller than or equal to 0.0060 percent of N, more than one of smaller than or equal to 0.03 percent of Ti, smaller than or equal to 0.05 percent of Nb andsmaller than or equal to 0.0050 percent of Ca and the balance of Fe and inevitable impurities. The steel sheet provided by the invention does not need to be subjected to heat treatment, is directly manufactured on a conventional hot rolling production line, is thin in specification (smaller than or equal to 12 mm), has the tensile strength being in a 400 Mpa grade or above and has the uniform elongation being the high uniform elongation of 20 percent or above; and after hot rolling, the steel sheet is relatively simple in cooling technology, uniform in performance and good in sheet shape, hasgood cold processing performance and welding performance, is low in production cost and can meet the requirements for formation performance of complex-shaped parts including an automotive chassis anda structural member.

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.

A steel sheet according to an aspect of the present invention includes a predetermined chemical composition; in which a metallographic structure in a ¼ t portion contains residual austenite of 4 volume % to 70 volume %; [Mn]_γ/[Mn]_ave>1.5 is satisfied in the ¼ t portion; f_γs/f_γ≤0.30 and [C]×[Mn]≥0.15 are satisfied in the ¼ t portion.

A ferrite stainless steel sheet for bellows stock pipe that simultaneously attains excellent workability and excellent high-temperature properties (high-temperature salt erosion resistance and high-temperature fatigue performance). In particular, there is provided a ferrite stainless steel sheet for bellows stock pipe comprising 0.015 mass% or less C, 1.0 mass% or less Si, 1.0 mass% or less Mn, 0.04 mass% or less P, 0.010 mass% or less S, 11 to 19 mass% Cr, 0.015 mass% or less N, 0.15 mass% or less Al, 1.25 to 2.5 mass% Mo, 0.3 to 0.7 mass% Nb, 0.0003 to 0.003 mass% B and the balance Fe and unavoidable impurities. In preferred form, there is provided a ferrite stainless steel sheet for bellows stock pipe whose average crystal grain diameter (D) is 35 mum or less, or whose surface roughness in terms of Ra is 0.40 mum or less.

The invention discloses an efficient in-vitro plant regeneration method of an adult high-quality single-plant Xiaoqiao oriental cherry of cerasus lannesiana var. speciosa. According to the efficient in-vitro plant regeneration method, a basic culture medium is set, and different hormone components and concentration level ratios are optimized; annual young sprouts of the adult plant are used as explants, and complete plants are formed by axillary bud induction, axillary bud multiplication and rooting culture; and after the complete plants are transplanted to a base material, healthy and strong nursery stocks which grow orderly and have consistent appearance are obtained. The efficient in-vitro plant regeneration method has the advantages that the growth speed of axillary buds of the explants is high; the induction rate is high and is up to be 100%; the multiplication coefficient is great and is up to be more than 4.5; the elongation growth of multiplied buds is rapid and the buds are 3cm-4cm high after being cultured for 15 days; the rooting rate can be up to be 100% and each plant has more than 5 roots; and tissue culture rooting seedlings are healthy and strong and have high transplanting survival rate. In actual production and application, annual large-scale rapid seedling growing can be carried out to produce young Xiaoqiao oriental cherry seedlings which are healthy and strong, and ordered and consistent, so that the efficient in-vitro plant regeneration method has a wide application prospect.