29 results about "Granoblastic" patented technology

The invention discloses a method for refining and homogenizing crystal grains of a 9%-12% Cr steel thick-wall large forge piece, and belongs to the field of ferrous metallurgy. According to the method, the large forge piece is heated to be close to the critical point of the complete austenitizing temperature in a stepped mode, the large forge piece is subjected to heat treatment by regulating and controlling dispersive precipitation of carbides in an initial structure and uniform nucleation of austenite and / or introducing a small amount of undissolved ferrite, residual precipitated phases and multi-phase interfaces and controlling the cooling speed; nucleation particles of pearlite transformation in the vibration heat preservation process are remarkably increased, uniform distribution of granular pearlite in the supercooled austenite is promoted, structural inheritance is cut off and eliminated, and the purpose of grain refining and homogenizing after performance heat treatment is achieved. According to the method, the grains of the thick-wall large forge piece are refined to 5 grades or above, the cross section grain size difference is within 2 grades, a series of problems that in the production process, grass waves exist in ultrasonic flaw detection, the grain size is unqualified, and the low-temperature impact toughness does not reach the standard can be solved, the product percent of pass and the production efficiency are remarkably improved, and meanwhile the production energy consumption is reduced.

This steel sheet has a predetermined chemical composition, and has a metallographic structure, at a position 1 / 4 of the sheet thickness, comprising, in terms of area%, granular bainite at 30-50%, acicular bainite at 20-50%, at least one selected from fresh martensite, tempered martensite, and retained austenite at 10-30% in total, and at least one selected from ferrite and pearlite at less than 5% in total. The metallographic structure in a surface region of the steel sheet comprises, in terms of area%, at least one selected from fresh martensite, tempered martensite, and retained austenite at 10% or less in total. MA phases, which are composed of the fresh martensite and the retained austenite, and the tempered martensite each have an equivalent circle diameter of 5.0 μm or less.

The purpose of the present invention is to provide: a high-strength steel sheet having a tensile strength of 980 MPa or more and excellent ductility, fatigue strength, and punchability; and a method for producing the high-strength steel sheet. A high-strength steel sheet which has a prescribed component composition, has 85% or more by area ratio of a bainite phase containing upper bainite and granular bainite as the main phase, has an area ratio of less than 15% of a hard second phase containing primary martensite and / or retained austenite phase, and has a thickness of less than 20 [mu] m in the bainite phase. The area ratio of the granular bainite is 5-40% relative to the area ratio of the upper bainite, the difference (Hv1-Hv2) between the hardness (Hv1) at the position 1 / 2 of the sheet thickness and the hardness (Hv2) at the position 1 / 4 of the sheet thickness is 30% or less relative to 0.3 TS, and the average crystal grain size of the upper bainite phase is 7 [mu] m or less.

The application provides a mudstone non-destructive and efficient dispersion method and relates to the technical field of mudstone dispersion. The mudstone non-destructive and efficient dispersion method comprises the following steps: step 1: sample grading pretreatment: according to the mudstone cementation strength, a grading crushing strategy is implemented, wherein high cementation strength mudstone is crushed to 0.1-0.2 cm granular, low cementation strength mudstone is crushed to 0.2-0.3 cm granular; a sample with a particle size deviation of no more than 0.05 cm is screened, after the sample surface impurities are removed by using deionized water, the sample is placed in a 50-70 DEG C constant temperature environment for drying for 10-14 hours to remove free water until the constant weight. The application constructs a three-stage composite salt solution gradient from low concentration to high concentration to balanced concentration, and is supplemented with a pulse vacuum negative pressure to break the mudstone pore gas lock effect; the first stage is to build a channel by shallow wetting, the second stage is to maximize the salt loading by near-saturation concentration, and the third stage is to utilize the chemical potential gradient by concentration adjustment to drive the surface microcrystals to diffuse inward, avoid the surface crust blockage and ensure the uniform penetration of the salt solution into the mudstone.

This steel plate has a predetermined chemical composition, and in its metal structure at a 1 / 4 position in the plate thickness, it contains, in area percentages, 30 to 50% granular bainite, 20 to 50% acicular bainite, 10 to 30% in total of one or more of fresh martensite, tempered martensite, and retained austenite, and less than 5% in total of one or more of ferrite and pearlite; and in the surface layer region, it contains, in area percentages, one or more of fresh martensite, tempered martensite, and retained austenite, and less than 10% in total of one or more of fresh martensite, tempered martensite, and retained austenite, and the average circle equivalent diameter of the MA phase consisting of the fresh martensite and the retained austenite, and the tempered martensite is 5.0 μm or less.

This steel sheet has a predetermined chemical composition. In the metal structure at the 1 / 4 position of the sheet thickness, in the area percentages, granular bainite takes 30-50%, acicular bainite takes 20-50%, one or more of fresh martensite, tempered martensite, and retained austenite takes 10-30% in total, ferrite and / or pearlite takes less than 5% in total, and the number density of precipitates containing B is 0.0050 precipitates / μm2 or less, and the metal structure at the 1 / 2 position of the sheet thickness includes, in the area percentages, 30-65% of granular bainite.

This invention relates to an oil-based drilling fluid plugging agent and its preparation method, comprising granular materials made of the following components by weight percentage: asphalt powder: 15-28 wt%; organic clay: 6-16 wt%; rock fiber: 25-40 wt%; nano-SiO2: 5-12 wt%; sepiolite: 8-15 wt%; elastic graphite: 8-18 wt%; and polyurethane (TPU) powder particles: 10-20 wt%. This invention features good compatibility, high efficiency, and excellent plugging effect. It can repair formation defects in the wellbore, prevent wellbore leakage, enhance the retention and plugging effect of oil-based drilling fluid in formation microfractures, improve wellbore stability, and effectively plug and strengthen the wellbore.

The present application relates to the technical field of super-thick steel plate, and particularly relates to a production method for improving low-temperature toughness of super-thick steel plate, which comprises the steps of water cooling and heat treatment of a rolling piece, the water cooling step cools the rolling piece to 20-40 DEG C below the bainite production temperature point, the cooling water amount and cooling speed are controlled, the structure from the near surface to the surface 10mm is mainly granular bainite + ferrite, the structure at the thickness 1 / 4 is mainly granular bainite + ferrite, and the structure at the thickness 1 / 2 is pearlite + ferrite; the heat treatment step is to heat the rolling piece after water cooling to 30-50 DEG C below the actual phase transition temperature for heat treatment, the structure from the near surface to the surface 10mm is mainly pearlite + ferrite, the structure at the thickness 1 / 4 is mainly ferrite + pearlite, and granular bainite is supplemented. The present application has simple process, high stability, short production cycle, low cost, great popularization and application prospect, and superior low-temperature toughness of the product.

The application discloses a high-strength anti-non-uniform-load oil casing which contains Fe and inevitable impurities, and additionally contains the following chemical elements in percentage by mass: C: 0.05-0.15%; Si: 0.41-0.8%; Mn: 3-5%; Ni: 0.2-0.5%; Ca: 0.0005-0.005%; Ti: 0.01-0.04%; Al: 0.01-0.05%; Nb: 0.02-0.04%; and the microstructure is ferrite+granular bainite+residual austenite. Correspondingly, the application also discloses a manufacturing method of the high-strength anti-non-uniform-load oil casing, which comprises the following steps: smelting and continuous casting; piercing; rolling and tension reducing; two-phase zone normalizing heat treatment: heating to an austenitizing temperature Ac1+60 DEG C to Ac3-60 DEG C, keeping warm for 30-60 min and then air cooling; and hot straightening.

The invention relates to a method for solving coarse grains within the range of 0-50mm below the surface of a 2Cr13 forge piece, which comprises the following steps of: controlling the deformation of a forging stock before forming, crushing coarse tissues within the range of 0-50mm of the forging stock, and promoting grain refinement; after forging is finished, the surface temperature of the forging stock is controlled, and the phenomenon that after the forging stock is loaded into a heating furnace, the grain size within the range of 0-50 mm under the surface of the forging stock recovers to be coarse due to the too high temperature is avoided; through low-temperature annealing, the forging stock is promoted to form granular pearlite and carbide structures, and basic preparation is made for refining the overall grain size of the forging stock; a rapid austenitizing mode is adopted, the nucleation number of fine austenite is increased, and therefore the grain size is refined, and the overall quality is homogenized; high-temperature tempering is adopted to stabilize the structure, the quality stability of the forge piece is improved, the overall quality of the 2Cr13 forge piece produced according to the method is improved, and the grain size within the range of 0-50 mm below the skin is effectively refined.

This invention discloses an economical 800MPa grade hot-dip galvanized steel sheet, comprising a substrate and a hot-dip galvanized layer. The substrate contains Fe and unavoidable impurities, and further contains the following chemical elements in the following mass percentages: C: 0.05-0.10%, Mn: 1.4-2.0%, Ti: 0.10-0.15%, Al: 0.02-0.08%. The substrate does not contain Si, Cr, Mo, or Ni. The microstructure of the substrate comprises a multiphase structure of granular bainite and ferrite, and second-phase particle precipitates, wherein the volume fraction of the second-phase particle precipitates is not less than 0.2%, and the volume fraction of second-phase particle precipitates with a size not greater than 10 nm accounts for more than 80% of the total volume fraction of second-phase particle precipitates. Accordingly, this invention also discloses a method for manufacturing this economical 800MPa grade hot-dip galvanized steel sheet.

The invention discloses a hot continuous rolling weather-resistant steel plate with yield strength of 550 MPa and a manufacturing method thereof, and belongs to the technical field of weather-resistant steel plates, the weather-resistant steel plate comprises the following chemical components: C, Si, Mn, Cr, Ni, Cu, Alt, Sb, Nb and Ca; the thickness specification of the hot continuous rolling weather-resistant steel plate is 16-23 mm, the metallographic structures of the surface, the 1 / 4 thickness and the core of the hot continuous rolling weather-resistant steel plate are ferrite, granular bainite and pearlite, the problems of high strengthening of the hot continuous rolling weather-resistant steel plate and toughness control at the extremely low temperature of-60 DEG C are solved, and meanwhile the hot continuous rolling weather-resistant steel plate has excellent corrosion resistance.

A cold rolled and annealed steel sheet includes by weight: 0.6≤C≤1.3%, 15.0≤Mn≤35%, 5≤Al≤15%, Si≤2.40%, S≤0.03%, P≤0.1%, N≤0.1%, possibly one or more optional elements chosen among Ni, Cr and Cu in an respective amount of up to 4.0%, up to 3.0% and up to 3.0% and possibly one or more elements chosen among B, Ta, Zr, Nb, V, Ti, Mo, and W in a cumulated amount of up to 2.0%, the remainder of the composition making up of iron and inevitable impurities resulting from the elaboration, the microstructure of the sheet including optionally up to 3% of kappa carbides, optionally up to 10.0% of granular ferrite, the remainder being made of austenite, the average grain size and average aspect ratio of the austenite being respectively below 6 μm and comprised between 1.5 and 6 and the average grain size and average aspect ratio of the ferrite, when present, being respectively below 5 μm and below 3.0.

The hot-stamping steel sheet of the present invention has a specified chemical composition and has an area ratio of ferrite S. α and the area ratio S of granular bainite GB The total is S α +S GB The area ratio S of granular bainite is 10% or more but less than 50%. GB The above-mentioned area ratio S of ferrite α The ratio is S GB / S α The metal structure is 0.30 to 0.70. Furthermore, the hot-stamped formed body manufactured from this hot-stamping steel sheet has a specified chemical composition, a metal structure with an average grain size of 5 to 25 μm of old austenite grains and a standard deviation of 0.1 to 2.0 μm of the grain size distribution of old austenite grains, and a tensile strength of 2200 MPa or more.

This hot-rolled steel sheet has a predetermined chemical composition, and in its metal structure at the 1 / 4 position of the sheet thickness, the area percentages are as follows: tempered martensite: more than 30% but not more than 80%, granular bainite: 10 to 50%, one or more of ferrite and pearlite: less than 5% in total, one or more of fresh martensite and retained austenite: not more than 10% in total, and the average aspect ratio of the prior austenite grains is 3.0 to 6.0.

The invention relates to a method for producing a particulate material comprising polyamide 6. The method comprises: (i) providing a solid particulate material MP (122) comprising polyamide 6; (ii) feeding the material MP (122) provided according to (i) into a melt extrusion apparatus E (114) via at least one material feeding device F1 (116, 140) wherein E (114) comprises (a) at least one material receiving member RE (120) for receiving the material MP (122) from the at least one feeding device F1 (116, 140) and for providing the MP (122) into a melting and conveying space SE (124); (b) a melting and conveying space SE (124) for melting polyamide 6 contained in MP (122) and conveying a mixture ME (126) comprising molten polyamide 6 to at least one forming orifice OE (130) via a conveying member CM (128), where SE (124) has a length LSE (132); (c) at least one forming aperture OE (130) for forming at least one strip (134) from the ME (126); (d) at least one degassing means GE (136) for removing at least a portion of the gas phase present in SE (124); (e) heating means HE (138) for providing polyamide 6 melting conditions in SE (124); (iii) subjecting the material MP (122) to polyamide 6 melting conditions in SE (124), obtaining the mixture ME (126) comprising molten polyamide 6 in SE (124), and further obtaining a gas phase comprising one or more gaseous decomposition products of the material MP (122) in SE (124), said melting conditions comprising a melting temperature TM; (iv) removing at least a portion of the gas phase obtained according to (iii) from SE (124) via the at least one degassing member GE (136); (v) removing the at least one strip (134) from the E (114) via the at least one forming orifice OE (130), the at least one strip (134) having a temperature TS, where TS < = TM; (vii) subjecting the at least one strand (134) to granulation to obtain the granular material MG (112). The invention further relates to a particulate material comprising polyamide 6 and to a device for producing a particulate material comprising polyamide 6. Furthermore, the use of a particulate material comprising polyamide 6 for producing a stream SCPL comprising purified epsilon-caprolactam, or a process for producing a stream SCPL comprising purified epsilon-caprolactam from a particulate material MG, is proposed. Furthermore, the use of SCPL for the preparation of one or more of polymers and polymer products, or a process for the preparation of one or more of polymers and polymer products by employing SCPL is presented.

Provided is a high-strength hot-rolled steel sheet having a tensile strength of at least 980 MPa and excellent in bendability, hole expandability and punchability. This high-strength hot-rolled steel sheet: has a prescribed composition; has a microstructure which contains a bainite phase composed of upper bainite and granular bainite, and either / both of fresh martensite or / and a retained austenite phase, and in which the area ratio of the bainite phase is 70-97%, the total area ratio of the fresh martensite and the retained austenite phase is 3-30%, the proportion of the granular bainite in the bainite phase is 0.40 or more, and the average aspect ratio of prior austenite grains is 2.0-5.0; and has an X value of 30% or less.

In a steel plate according to one aspect of the present disclosure, the total area ratio of polygonal ferrite and granular bainite is 70-100% in the metallographic structure at a depth of 0.1 mm from the surface, the area ratio of polygonal ferrite is 70% or more, the average particle diameter of the metallographic structure at a depth of 0.1 mm from the surface is 30.0 [mu] m or less, and the average particle diameter of the metallographic structure at a depth of 0.1 mm from the surface is 30.0 [mu] m or less. The total area ratio of polygonal ferrite and granular bainite in the metallographic structure at a depth of 0.5 mm from the surface is 75-95% and the area ratio of polygonal ferrite is 50% or more, and the total area ratio of polygonal ferrite and granular bainite in the metallographic structure at a depth of 2 t / 5 from the surface of the steel sheet is 50-97% and the area ratio of polygonal ferrite and granular bainite in the metallographic structure at a depth of 2 t / 5 from the surface of the steel sheet is 50-97%. The average particle diameter of the metallographic structure at a position at a depth of 2 t / 5 from the surface is 20.0 [mu] m or less, the maximum hardness Hvmax of the surface layer part is 220 Hv or less, and the yield ratio of the steel sheet is 70% or more.

Provided are: a steel sheet which has a prescribed chemical composition and has a metallographic structure containing, in area%, 60.0-85.0% of martensite, 10.0-30.0% of granular bainite having a maximum orientation difference of 3.5 DEG or less and an intragranular orientation difference of 10 DEG or more at an intragranular 0.1 [mu] m interval surrounded by grain boundaries having an orientation difference of 15 DEG or more, and 20.0% or less of ferrite; the average interval between the granular bainite grains is 50.0 [mu] m or less.

The purpose of the present invention is to provide a steel sheet having high strength, high ductility, and low yield elongation, and a method for manufacturing the same. A steel sheet having a component composition containing, in mass%, 0.03% to 0.15% inclusive of C, 0.05% or less of Si, 0.10% to 0.60% inclusive of Mn, 0.025% or less of P, 0.020% or less of S, 0.20% or less of Al, 0.0001% to 0.0200% inclusive of N, 0.005% to 0.030% inclusive of Nb, the remainder being Fe and unavoidable impurities, 0.5% to 10.0% inclusive of martensite in terms of areal fraction, 5% to 30% inclusive of pearlite, bainite and granular cementite in terms of areal fraction, and the remainder being ferrite, among the granular cementite, granular cementite having a maximum particle diameter of 3 [mu] m or less is 1.0% or more in area fraction with respect to the overall structure.

The present invention relates to the technical field of the preparation of double hexagon bits, and particularly to a method for preparing an S3 double hexagon bit, including: performing cold drawing treatment on the surface-treated S3 wire rod through a wire drawing machine to obtain a semi-finished wire; performing spheroidizing annealing treatment on the wire through a pit type annealing furnace to obtain a granular pearlite structure; determining the qualification of the annealing treatment according to the uniformity index of the granular pearlite; performing pickling and phosphating treatment on the annealed qualified wire and then performing hexagonal drawing through a wire drawing machine to obtain a hexagonal wire; obtaining an S3 double hexagon bit by performing shearing, shaping, and rod shrinking on the drawn qualified hexagonal wire through a cold heading machine; determining the qualification of a single S3 double hexagon bit according to the comprehensive performance characteristic value and determining the qualification of the preparation of the S3 double hexagon bit according to the proportion of the qualified S3 double hexagon bits in the sampling inspection. The present invention improves the performance stability and preparation efficiency of the double hexagon bit.

This hot-rolled steel sheet has a prescribed chemical composition, wherein in the metal structure at a 1 / 4 sheet thickness location, in terms of area%, more than 30% and not more than 80% is tempered martensite, 10% to 50% is granular bainite, less than 5% total is one or more types among ferrite and pearlite, and not more than 10% total is one or more types among fresh martensite and residual austenite, and the average value of the aspect ratio of prior austenite grains is 3.0 to 6.0.

This steel plate has a predetermined chemical composition, and in the metallographic structure at the 1 / 4 position of the plate thickness, it contains, by area percentage, granular bainite: 30 to 50%, acicular bainite: 20 to 50%, one or more of fresh martensite, tempered martensite, and retained austenite: 10 to 30% in total, one or more of ferrite and pearlite: less than 5% in total, and the number density of precipitates containing B is 0.0050 precipitates / μm 2 At the 1 / 2 position of the plate thickness, the metal structure contains granular bainite in an area percentage of 30 to 65%.

The present invention relates to a method (900) for producing artificial stone slabs comprising grinding (901) an inert material comprising silicates having an aluminium oxide content greater than or equal to 25% by weight, until a mixture of granulated material is obtained in which a coarse fraction of granules, having a diameter greater than 300 μm, is 70% by weight of the total weight of the mixture. The method (900) further comprises spraying and drying (902) a suspension comprising the granulated material by means of an atomizing device until an atomized material is obtained. Furthermore, the method comprises depositing (903) the atomized material on at least one movable surface of a compacting device and compacting (904) the atomized material on the movable surface, to obtain a slab of compacted material. The method (900) further comprises heating (906) the slab of compacted material to a temperature between 50° C. and 1250° C., for a time period of less than or equal to 45 min and greater than or equal to 10 min, to obtain a slab of consolidated material.

The application discloses a 900MPa-grade hot-base hot-dip galvanized steel plate, which comprises a base plate and a hot-dip galvanizing layer, the base plate contains Fe and inevitable impurities, and further contains the following chemical elements with mass percentage as follows: C: 0.06%-0.10%, Mn: 1.5-2.15%, Al: 0.02-0.08%, 0 The microstructure of the base plate comprises granular bainite and second-phase particle precipitates, the volume fraction of the second-phase particle precipitates is not less than 0.2%, and the proportion of the second-phase particle precipitates with a size not greater than 10nm in the volume fraction of all the second-phase particle precipitates is greater than 80%.

A kind of low-temperature steel plate for ship is provided with the following chemical components by mass percentage: C=0.05%~0.09%, Si=0.10%~0.30%, Mn=1.20%~1.80%, P≤0.008%, S≤0.002%, Al=0.05%~0.08%, Ti≤0.005%, Nb≤0.020%, N=0.0050%~0.0080%, B=0.0010%~0.0025%, and the balance is Fe and inevitable impurities.The steel plate is produced by TMCP process to obtain fine equiaxed ferrite and a small amount of pearlite structure, which has good strength and toughness: yield strength≥355MPa, tensile strength≥490MPa, elongation≥21%, and impact energy at-60℃≥180J.The microstructure of the steel plate after heat treatment is mainly composed of fine lath bainite, granular bainite and tempered sorbite with fine lath or short rod ferrite as the matrix, and the strength and low-temperature impact toughness are not lower than those of the base material, which fully meets the requirements of low-temperature steel and heat treatment for shipbuilding such as LPG ship.

The invention relates to a hot-rolled steel sheet having a composition comprising, in weight percent: C: 0.10% to 0.25%, Mn: 3.5% to 5.0%, Si: 0.80% to 1.60%, B: 0.0003% to 0.004%, S = 0.010%, P = 0.020%, N = 0.008%, the remainder of the composition being iron and unavoidable impurities resulting from smelting, and having a microstructure consisting of, in surface fraction: between 50% and 80% lath bainite, less than 30% granular bainite, the remainder being martensite, martensite-austenite islands and austenite films, and having less than 20% martensite and the MA islands having the multiplication of the maximum length Lmax of the grain by the maximum width Wmax. of the grain larger than 1 µm2.

A steel sheet according to an aspect of the present invention has a predetermined chemical composition, in which a metallographic structure in a thickness ¼ portion includes, by volume percentage, ferrite: 10% or more and less than 50%, granular bainite: 5% or more and less than 40%, martensite: 30% or more and 55% or less, upper bainite and lower bainite: less than 30% in total, pearlite: less than 10%, and residual austenite: less than 5%, a proportion of the number of the martensites adjacent to the ferrite to the number of the metallographic structures adjacent to the ferrite is 30% or less in the thickness ¼ portion, and the difference between the absolute maximum value and the absolute minimum value of Vickers hardness at a load of 50 gf obtained at an interval of 30 μm from a position of a depth of 100 μm in a sheet thickness direction from a surface of the steel sheet as a starting point to a thickness middle portion position is 60 HV or less.