9713 results about "Carbon steel" patented technology

The present invention employs alkyl polysilicate to form silicone-polyester-polysilicate hybrid compositions with an appropriate proportion to modify silicone-polyester resin, or directly adds the alkyl polysilicate at an appropriate proportion into silicone-polyester resin to produce a hybrid composition. The composition in high baking temperature forms a hybrid structure having good thermal resistance, especially, hot-oil resistance and hot hardness, and good adhesion to metals such as carbon steel, stainless steel and aluminum. The present invention can be used in the field of the protective coating for heat-resistant metal such as frying pans and electric irons to be a kind of novel heat-resistant composition having hybrid structure. The composition in accordance with the present invention comprises (A)silicone-polyester; (B)alkyl polysilicate and the structure thereof comprises (RO)₃—Si—O—(Si(OR)₂—O)_n—R, where n=0˜20 and R represents —CH₃, —C₂H₅, —C₃H₇, or —C₄H₉. The composition mentioned above comprises the compounds of (A) and (B) or the copolymer comprised by (A) and (B).

The invention provides a high-abrasion Ti(C, N) based metal ceramic tool and a preparation thereof. The Ti(C, N) based metal ceramic tool uses Ni and Co as a binder phase, is added with at least one carbonitride of Ti(Cx, N1-x) or (TiC)x plus (TiN)1-x as a basic batch, and consists of at least one composition of WC, Mo2C, Co, Ni, ZrC, Cr3C2, VC, TaC and NbC, and the balance being Ti(Cx, N1-x) or (TiC)x plus (TiN)1-x, wherein, an X value for adding the carbonitride of the Ti(C, N) based metal ceramic tool is as follows: X is less than or equal to 0.5 and more than or equal to 0.4, or the X is more than 0.5 and less than or equal to 0.7. The Ti(C, N) based metal ceramic tool is prepared according to the content of nitrogen by nitrogen pressure sintering or vacuum sintering combined with hot isostatic pressing treatment, thereby preventing nitrogen from escaping during the process of sintering high-nitrogen alloy, so that the high-nitrogen-carbon ratio in matrix and material hardness can be reliably guaranteed, and anti-oxidative abrasion property and anti-diffusive abrasion property of the material can be obviously increased through adding slight ZrC, Cr3C2, VC and other carbides into the basic batch; meanwhile, compactability and buckling strength of a low-nitrogen alloy structure can be obviously improved through optimally distributing each composition and content. The Ti(C, N) based metal ceramic tool is widely suitable for high-speed cutting tools of medium-low carbon steel and low alloy steel.

The invention discloses a common low-carbon steel anti-oxidizing paint under high temperature, which comprises the following steps: grinding ore powder with Al2O3, SiO2, Fe2O3, metallurgical waste, reducer with carbon and inorganic binder to below 100 orders separately; blending evenly; stirring the powder with water evenly; adjusting the quantity of added water to the density of paint slurry to 1100-1500kg/m3; spraying the steel blank (below 1000 deg. c) before heat by rolling furnace directly; forming continuous protective layer to avoid oxidizing and damaging in the soaking course; saving the cost.

Alloy steels that combine high strength and toughness with high corrosion resistance are achieved by a dislocated lath microstructure, in which dislocated martensite laths that are substantially free of twinning alternate with thin films of retained austenite, with an absence of autotempered carbides, nitrides and carbonitrides in both the dislocated martensite laths and the retained austenite films. This microstructure is achieved by selecting an alloy composition whose martensite start temperature is 350° C. or greater, and by selecting a cooling regime from the austenite phase through the martensite transition region that avoids regions in which autotempering occurs.

The invention discloses a carbon steel and stainless steel clad steel plate with toughness performance, and belongs to the technical field of production of metal clad plates. Carbon steel is a basal material, and satisfies the requirements of API5L "American Petroleum Pipeline Steel Specification"; 316L stainless steel is a multiple layer, and components satisfy the requirements of ASTM A240M-05 standard "Standard Specification of Chromium and Chromium Nickel Stainless Steel Plate, Sheet and Strip Steel for Pressure Vessels and General Purposes"; flux is BNi brazing filler metal; and solder resist is a mixture of magnesium oxide and aluminum oxide. The process comprises steel blank assembly, heating, rough rolling, finish rolling and heat treatment. The clad steel plate has excellent toughness performance and hydrogen induced cracking resistance, so that the use safety of crude oil conveying pipes is improved.

There is provided a tool at least partly coated with at least two refractory layers of which one of the said layers is a fine-grained α-Al₂O₃-layer which is the top layer along the cutting edge-line and the other a TiC_xN_yO_z- or a ZrC_xN_y-layer being the top layer on the clearance face. The coated tool exhibits excellent flank and crater wear and high resistance to flaking, particularly when used for machining of low carbon steel and stainless steel. Used cutting edges can easily be identified by the naked eye.

The invention discloses a dual-metal sliding bearing and a preparation method thereof. Carbon steel or stainless steel is taken as an outer layer material, and a powder metallurgy material taking a copper alloy as a basal body is taken as an inner layer material; the inner surface of the outer layer material is electroplated to form an electroplated copper layer with the thickness of 4-8 micrometres; the inner layer material comprises the following components by weight percent: 1%-20% of aluminum, 1%-8% of titanium, 1%-15% of stannum, 0.1%-5% of ferrum, 0.1%-2% of phosphorus, 0.1%-5% of nickel, at least one of 0.1%-2% of graphite and 0.1%-2% of molybdenum disulfide or 0.1%-2% of zinc stearate, and the balance of copper; and the bearing is impregnated with lubricating oil. The dual-metal sliding bearing has the advantages of low cost, high carrying capability, self-lubrication, excellent abrasion resisting capability, and the like, and can be widely applied to reciprocating swing positions of a swing arm, a bucket rod, a bucket, and the like of a large-tonnage and high-power excavator.

The invention provides a method for melting ultra-low carbon steel. The method adopts a desulfuration of molten iron-converter-RH-continuous casting process, wherein a sulfur content in the molten iron is 0.002%-0.006% after desulphurization; converter smelting controls oxygen blowing time, an oxygen gun flow, a bottom-blowing intensity and a smelting period, adopts slag-stopping tapping, steel tapping with a content of C being 0.06%-0.08% and with a temperature of 1650-1680 DEG C, and an oxygen content in the molten iron is 0.03%-0.05%; an RH adopts forced decarburization with a highest vacuum degree of 67-100 MPa and decarburization time of 15-27 min, and a carbon content in the molten iron is 0.0010%-0.0020% and a dissolved oxygen content in the molten iron is 0.025%-0.040% after the decarburization; the molten iron is recycled for 3-5 min after deoxidation by adding aluminium and recycled for another 3-5 min after adding other alloys; a nitrogen content in the molten iron is 0.0015%-0.0035%, and the temperature is 1590-1640 DEG C; and killed steel treatment is carried out for 10-30 min. The method adopts converter tapping with a high carbon and low oxygen content, can use less or not use slag modified agents during the tapping process, accelerates the production rhythm, makes the molten steel cleaner, and reduces the production cost.

A process for manufacturing carbon-steel strip having a thickness of less than or equal to 10 mm directly from liquid steel, by casting said liquid steel between the lateral surfaces, made of copper or copper alloy, of two internally cooled rotating horizontal rolls.

A steel sheet excellent in mechanical strength, workability and thermal stability and suited for use as a raw material in such fields of manufacturing automobiles, household electric appliances and machine structures and of constructing buildings, and a manufacturing method thereof. are provided.

The steel sheet is a hot-rolled steel sheet of carbon steel or low-alloy steel, the main phase of which is ferrite, and is characterized in that the average ferrite crystal grain diameter D (μm) at the depth of ¼ of the sheet thickness from the steel sheet surface satisfies the relations respectively defined by the formulas (1) and (2) given below and the increase rate X (μm/min) in average ferrite crystal grain diameter at 700° C. at the depth of ¼ of the sheet thickness from the steel sheet surface and said average crystal grain diameter D (μm) satisfy the relation defined by the formula (3) given below:

1.2≦D≦7   formula (1)

D≦2.7+5000/(5+350·C+40·Mn)²  formula (2)

D·X≦0.1   formula (3)

wherein C and Mn represent the contents (in % by mass) of the respective elements in the steel.

The invention provides a high hardness ferrite stainless steel wearable flux-cored wire, which takes a low carbon steel H08A cold rolling thin steel strip as an external wrapper; furthermore, the wrapper is internally provided with a powder core which is composed of graphite, metal and alloy powder; the weight percentages of all ingredients of the powder core are 50-75% of high carbon ferrochrome, 10-16% of ferrovanadium, 6-10% of ferrotitanium, 2-10% of tungsten carbide, 2-3% of nickel powder, 1.5-2.5% of silver graphite, 1-3.5% of boron carbide, 1-2% of aluminium magnesium powder, 0-10% of metallic chromium, and the residual quantity of reduced iron powder; the filling proportion of the powder core is 46-50%; the invention adopts the technical proposal that high-content ferrovanadium and adequate alloy powders such as tungsten carbide and boron carbide, etc. are added into the flux-cored wire, changes the microstructure of the existing ferrite stainless steel flux-cored wire surfacing alloy, overcomes the shortages of poor wearability and ductility, and can be applied to submerged arc bead weld manufacture or repair of the parts which has high requirement of abrasion and the corrosion resistance of the wearable grain.

A non-oxide compound magnesite-graphite brick containing carbon less than 6% belongs to a fire resisting material. The material contains magnesia of 75-94%, carbon of 1-5%, non-oxide such as nitride and boride of 0.4-20%, additive of 0-5%, and binder containg carbon. Such magnesite-graphite brick with low carbon has a low heat conductivity, a small acierating to the molten steel and less pollution to the low carbon steel compared to the common magnesite-graphite brick. The magnesite-graphite brick has a good slag resistance because the magnesia is the primary component. And it also has a good heat shock capacity because the carbon is one of the primary components. The carbon prevents said non-oxide from being oxidated. The brick maintains a good heat and shock resistance and slag resistance when reducing the proportion of the carbon because said non-oxide has a low heat expansion and a wet resistance to the slag.

The invention relates to electrostatic spraying anti-rust oil and a production method thereof, which essentially solves the problems of the prior art that the lubricating property of the anti-rust oil is poor; and interlayer sliding is caused due to larger tension during the reeling process of the steel plate, resulting in steel plate scratch and having impact on the surface quality of the steel plate. The electrostatic spraying anti-rust oil commendably solves the problems by using the technical proposal comprising components of weight percentages as follows: a) 5 to 30 percent of anti-rust agent, b) 0.1 to 5 percent of surface activator, c) 0.1 to 15 percent of anti-friction composition, d) 0.1 to 5.0 percent of antioxidant and e) 50 to 90 percent of base oil, and can be used for the electrostatic spraying rust resistance of the cold-rolled carbon steel plate, galvanized plate and aluminized zinc silicon plate of the steel enterprises.

The present invention relates to conducting paint, and is especially one kind of TiB2 powder based conducting paint powder and its preparation process and application. The TiB2 powder based conducting paint powder consists of film forming material, coupling agent, diluent, assistants and curing agent; and conducting assistant consists of TiB2 powder as main component, carbon black, graphite, acetylene black and other conducting powder in certain proportion. It is prepared through adding the assistants into the film forming material and dispersing in a dispersing machine, adding coupling agent and conducting powder through stirring, adding mixed diluent through stirring to obtain paint product. The conducting paint coating is formed through brushing, spraying or dipping, and cured at room temperature or through heating. The present invention has the advantages of high conducting property, high hardness, high wear resistance, excellent protecting performance, etc.

This invention relates to a saw bit belonging to mechanical working field, which comprises metal base being alloy steel or carbon steel, with Phi8-Phi10mm radiating holes equispaced on its surface; Carcass including alumina, zircite, quartz, tungsten carbide, zirconium diboride, molybdenum disilicide; common abradant including brown fused alumina, carbofrax, green silicon carbide, cubic carbofrax, boron carbide; superhard abradant including diamond and cubic boron nitride. The produce process includes mixing carcass flour, working layered material batching-mixing process, welding layered material batching-mixing process, koldflo, thermal pressing-sintering formation, arc milling, welding, dressing and making edge. The invention has improved working efficiency, lowered product cost, and is suitable for cutting metal tube, plate such as this materials.

The present invention discloses a series flux-cored wire for reparation and refabrication of large-size medium-high carbon steel components and parts. Its chemical composition includes (wt%) 5-10 of fluorite, 25-45% of high-carbon ferrochrome, 2-10% of high-carbon manganese iron, 5-8% of tantiron, 10-15% of ferro-molybdenum, 8-14% of rare earth oxide, 5-15% of metal nickel, 2-5% of ferrovanadium, 0.5-2% of graphite, 2-4% of chloride and 1-2.5% of aluminium-magnesium alloy. Its external covering adopts low-carbon steel tape.