Baoshan Iron & Steel Patente

The present disclosure provides a seamless tube, which comprises Fe and unavoidable impurities, and further comprises the following chemical elements in percentage by mass: C: 0.19-0.23%, Si: 0.1-0.6%, Mn: 0.6-1.5%, Cr: 0.1-0.4%, Mo: 0.1-0.18%, Nb: 0.02-0.04%, Ti: 0.01-0.03%, B: 0.0015-0.005%, Al: 0.01-0.05%, Ca: 0.0005-0.005%; wherein the seamless tube does not contain Ni or W. The present disclosure also provides a method of manufacturing the seamless tube, comprising the following steps: performing smelting and continuous casting to obtain a tube billet; subjecting the tube billet to heating, perforating, rolling, and sizing to obtain a tube body; subjecting the tube body to a heat treatment: austenitizing at a temperature of 900-930°C with a holding time of 30-60 min, quenching, and then tempering at a temperature of 550-650°C with a holding time of 50-80 min; and hot sizing and straightening.

The present disclosure discloses an oil casing. In addition to Fe and inevitable impurities, the oil casing also comprises the following chemical elements in percentage by mass: C: 0.05-0.15%; Si: 0.4-0.8%; 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%. The oil casing has a microstructure of ferrite+granular bainite+ austenite. The present disclosure also discloses a method for manufacturing the above-mentioned oil casing.

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A coating solution for oriented silicon steel, containing a first dihydrogen phosphate, a second dihydrogen phosphate, and colloidal silica; wherein the first dihydrogen phosphate is at least one selected from dihydrogen phosphates of Al, Mg, Ca, Sr, Ba, Zn, Ni, and Mn; the second dihydrogen phosphate comprises copper dihydrogen phosphate; and the coating solution does not contain Cr. An oriented silicon steel sheet, comprising a substrate and a coating on the surface of the substrate, and the coating is formed from the coating solution described above. A method for manufacturing the oriented silicon steel sheet. The coating of the oriented silicon steel sheet exhibits excellent performances of tension, moisture absorption resistance, heat resistance, corrosion resistance, and anti-sticking property.

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Disclosed in the present invention is an economical 800 MPa-grade hot-rolled hot-dip galvanized steel sheet, comprising a substrate and a hot-dip galvanized layer. The substrate contains Fe and inevitable impurities. In addition, the substrate further contains the following chemical elements in percentage by mass: 0.05-0.10% of C, 1.4-2.0% of Mn, 0.10-0.15% of Ti, and 0.02-0.08% of Al. The substrate does not contain elements Si, Cr, Mo and Ni. Microstructures of the substrate include a complex-phase structure of granular bainite and ferrite, and second-phase particle precipitates; the volume fraction of the second-phase particle precipitates is not less than 0.2%; and the ratio of the volume fraction of the second-phase particle precipitates having a size not greater than 10 nm to the volume fraction of all the second-phase particle precipitates is greater than 80%. Correspondingly, further disclosed in the present invention is a manufacturing method for the economical 800 MPa-grade hot-rolled hot-dip galvanized steel sheet.

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The present disclosure provides a cylinder tube, comprising, in addition to Fe and inevitable impurities, the following chemical elements in percentage by mass: C: 0.14-0.20%; Si: 0.15-0.55%; Mn: 0.5-1.5%; Cr: 0.5-1.5%; Mo: 0.25-0.65%; W: 0.3-0.8%; V: 0.05-0.1%; Nb: 0.02-0.06%; Al: 0.01-0.05%; Ca: 0.0005-0.005%. The present disclosure further provides a method for manufacturing the aforementioned cylinder tube. Through a rational design of chemical composition and, preferably, in combination with specific processes, the cylinder tube exhibits high strength, and possesses low residual stress and a low yield ratio, while exhibiting good weldability.

Disclosed in the present invention is a 900 MPa-grade hot-rolled hot-dip galvanized steel plate which comprises a substrate and a hot-dip galvanizing layer. The substrate contains Fe and inevitable impurities, and the substrate further comprises the following chemical elements in percentage by mass: 0.06%-0.10% of C, 1.5-2.15% of Mn, 0.02-0.08% of Al, 0 < Cr ≤ 0.5%, 0.05-0.30% of Mo, 0.11-0.16% of Ti, and 0 < Nb ≤ 0.05%. The substrate does not contain Si element, and the microstructure of the substrate comprises granular bainite and second-phase particle precipitates, the volume fraction of the second-phase particle precipitates being not less than 0.2%, and the volume fraction ratio of the second-phase particle precipitates having the size not larger than 10 nm to all the second-phase particle precipitates being greater than 80%.

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A piercing plug for high-alloy steel pipe rolling, comprising a plug base body (1), a high-strength alloy layer (2) provided on the plug base body, and an oxide film layer (3) provided on the high-strength alloy layer. The high-strength alloy layer is made of a cobalt-based alloy; and the oxide film layer is made of an iron-based alloy. Also provided are a cobalt-based alloy and an iron-based alloy. According to the piercing plug, the high-strength alloy layer is designed on the plug base body, thereby solving the problem of falling-off of an oxide film on the surface of the plug due to high-temperature softening of a support part, and by designing the oxide film layer, the problem of steel bonding due to large temperature rise of the surface of the plug is solved, so that the piercing plug for high-alloy steel pipe rolling has good high-temperature strength, and the service life is further prolonged.

A high-performance-uniformity subsea pipeline steel and a manufacturing method therefor. The chemical components of the high-performance-uniformity subsea pipeline steel comprise, in percent by weight: C: 0.02-0.06%, Si: 0.10-0.30%, Mn: 1.20-1.65%, Cu ≤ 0.30%, Ni ≤ 0.30%, Cr: 0.15-0.30%, Mo ≤ 0.15%, Nb: 0.03-0.05%, V ≤ 0.05%, Ti: 0.008-0.020%, Ca: 0.0012-0.0030%, and Al: 0.015-0.045%, with the balance comprising Fe and inevitable impurities, where it is required to control impurity elements P ≤ 0.01%, S ≤ 0.001%, B ≤ 0.0004%, N ≤ 0.005%, O ≤ 0.0025% and H ≤ 0.0002%. The manufacturing method uses an austenite recrystallization zone and non-recrystallization zone two-stage controlled rolling technology, spread ratio control, and controlled cooling, such that in addition to high performance, obtained subsea pipeline steel also has good performance uniformity.

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The present disclosure relates to a non-oriented electrical steel sheet with low iron loss at high frequencies and excellent fatigue performance. In addition to Fe and inevitable impurities, the non-oriented electrical steel sheet further comprises the following chemical elements in mass percentage: 0<C ≤ 0.0045%, Si: 2.65-3.75%, Mn: 0.10-1.04%, Al: 0.10-1.85%. The number of Al<2>O<3> inclusions with a size of 2.0 µm or more in the non-oriented electrical steel sheet is not more than 4 counts/mm<2>. In addition, the present disclosure further relates to a method for manufacturing the non-oriented electrical steel sheet. The non-oriented electrical steel sheet has the advantage of low iron loss at high frequencies, so that motor energy loss can be reduced and motor efficiency can be improved. Also, the non-oriented electrical steel sheet has excellent fatigue performance, enabling the motor core and rotor to operate stably at high speeds within a temperature range from room temperature to 150 °C, without deformation or fracture.

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