Weather-resistance bridge high-strength steel plate and production method thereof

The invention discloses a weather-resistance bridge high-strength steel plate and a production method thereof. The weather-resistance bridge high-strength steel plate is prepared from the following components in percentage by weight: less than or equal to 0.11 percent of C, 0.30 to 0.50 percent of Si, 1.10 to 1.35 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.006 percent of S, 0.25 to 0.40 percent of Ni, 0.04 to 0.08 percent of V, 0.025 to 0.045 percent of Nb, 0.010 to 0.040 percent of Alt, 0.45 to 0.70 percent of Cr, 0.25 to 0.40 percent of Cu, 0.02 to 0.08 percent of Mo, 0.015 to 0.025 percent of Ti, less than or equal to 0.015 percent of N and the balance of Fe and inevitable impurities. The invention also relates to a production method of the weather-resistance bridge high-strength steel plate. The steel plate has excellent obdurability matching, high yield strength, high weather resistance and high cold-workability. The steel quality is purer, and ...

Large-thickness quenched and tempered steel sheet having yield strength greater than 890Mpa and production method thereof

The invention discloses a large-thickness quenched and tempered steel sheet having yield strength greater than 890Mpa and a production method thereof. The production method comprises the following steps of smelting and continuous casting, heating and rolling and heat treatment, wherein the continuous casting billet obtained in the processes of smelting and continuous casting comprises the following chemical components in percentage by weight: 0.16%-0.20% of C, 0.20%-0.40% of Si, 1.05%-1.15% of Mn, less than or equal to 0.01% of P, less than or equal to 0.005% of S, 1.00%-1.10% of Cr, 0.40%-0.50% of Mo, less than or equal to 0.10% of Cu, 0.75%-1.25% of Ni, 0.045%-0.05% of V, 0.02%-0.03% of Nb, 0.03%-0.05% of Ti, 0.002%-0.004% of B and the balance of Fe and unavoidable impurities. The steel sheet has the advantages of excellent strength and toughness, good low-temperature impact toughness, uniform mechanical properties, and good low-temperature impact property and strip shape, meets the requirements ...

Large-thickness rolled steel plate instead of case one for large-sized ball mill and production method thereof

The invention discloses a large-thickness rolled steel plate instead of a cast one for a large-sized ball mill and a production method thereof. The steel plate is formed by smelting the following components by weight percent: 0.160-0.190% of C, less than or equal to 0.45% of Si, 1.300-1.500% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.020-0.050% of Als, 0.015-0.025% of Nb and the balance Fe and inevitable impurities. The method comprises the following steps: smelting molten steel in an electric furnace; refining in an LF refining furnace; performing vacuum treatment in a vacuum degassing furnace; and casting, electroslag remelting, heating, rolling to finished product, cooling, performing hydrogen expanding treatment and normalizing and the like to prepare into the finished product thick steel plate. The invention has the following advantages: 1) the strength and toughness are matched favorably, the yield strength Re is more than or equal to 265 MPa, Rm ...

F-grade large-thickness weldable steel plate with high pureness and high low-temperature toughness and production method thereof

The invention discloses an F-grade large-thickness weldable steel plate with high pureness and high low-temperature toughness and a production method thereof. The steel plate consists of the following components in percentage by mass: 0.10-0.20% of C, 0.15-0.55% of Si, 0.90-1.80% of Mn, P not higher than 0.03%, S not higher than 0.03%, 0.020-0.040% of Nb, 0.010-0.080% of Al, 0.035-0.085% of V, Ti not higher than 0.020%, and the balance of Fe and inevitable impurities. The method performs the production through an electroslag remelting process; the largest thickness of the steel plate can reach 500 mm; the high pureness is realized after the remelting; the interior structure of the steel plate is compact; the low-power defect control is lower; the low-power structure of the steel plate has no such defects as cracks and air holes; the looseness and segregation grades are not higher than 1.0 grade; the ultrasonic flaw detection is performed to satisfy the I-grade requirement of GB/T2970; the ...

Method for producing large-thickness lamination-crack-resistant tempered high-strength steel plate

The invention discloses a method for producing a large-thickness lamination-crack-resistant tempered high-strength steel plate. The method is characterized by comprising the steps: smelting, performing continuous casting, performing electroslag remelting, heating, rolling, annealing and performing heat treatment. The steel plate comprises the following chemical components in percentage by weight: 0.14-0.18 percent of C, 0.20-0.50 percent of Si, 0.95-1.25 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.80-1.15 percent of Ni, 0.40-0.60 percent of Cr, 0.40-0.60 percent of Mo, 0.020-0.050 percent of Nb, 0.010-0.030 percent of Ti, 0.020-0.045 percent of TAl, and the balance of Fe and inevitable impurities. According to the method, electroslag remelting treatment is adopted, good overall performance of the large-thickness steel plate with the diameter of 30mm can be met due to the reasonable controlled rolling and heat treatment process, and ...

Low-temperature tempered high-strength steel plate of over 1,100MPa and production method thereof

The invention discloses a low-temperature tempered high-strength steel plate of over 1,100MPa and a production method thereof. The steel plate consists of the following components in percentage by weight: more than or equal to 0.16 percent and less than or equal to 0.20 percent of C, more than or equal to 0.20 percent and less than or equal to 0.40 percent of Si, more than or equal to 1.00 percent and less than or equal to 1.20 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.003 percent of S, more than or equal to 0.30 percent and less than or equal to 0.50 percent of Cr, more than or equal to 0.40 percent and less than or equal to 0.60 percent of Mo, less than or equal to 0.10 percent of Cu, more than or equal to 0.80 percent and less than or equal to 1.00 percent of Ni, more than or equal to 0.045 percent and less than or equal to 0.05 percent of V, more than or equal to 0.02 percent and less than or equal to 0.03 percent of Nb, more than or equal to 0.015 ...

Steel plate for heavy-duty generator and manufacturing method thereof

The invention discloses a steel plate for a heavy-duty generator. The steel plate is formed by smelting the following components according to weight percent: 0.18-0.21% of C, 0.10-0.30% of Si, 1.10-1.25% of Mn, less than or equal to 0.018% of P, less than or equal to 0.005% of S, less than or equal to 0.008% of N, 0.020-0.050% of TAL, 0.020-0.035% of Nb, less than or equal to 0.44% of Ceq, the balance of Fe and inevitable impurities. The delivery state of the invention is normalization. The steel plate for a 274-280mm heavy-duty generator which is milled instead of forged and produced by using the normalizing technique has a better toughness index after being fully stacked and grain refined. By using II type rolling control technique and rolling in two steps, the invention solves the problem that the size of the grain is uneven and the impact toughness is decreased and increases the thickness size of the producible steel plate.

Steel plate for guide blades of large hydropower generating units and production method thereof

The invention discloses a steel plate for guide blades of large hydropower generating units, which is smelted by the following components by weight: 0.18-0.21% of C, 0.60-0.80% of Si, 1.10-1.25% of Mn, not more than 0.020% of P, not more than 0.005% of S, not more than 0.15% of Cu, 0.020-0.050% of Alt and the balance Fe and inevitable impurities. The steel plate has the following advantages: (1) the steel plate has good strength and toughness matching, yield strength not less than 275MPa, Rm not less than 490MPa, 0-DEG C longitudinal impact energy not less than 27J, A50 not less than 14%, psi not less than 30% and HB not less than 145; (2) the steel plate is purer and has P not more than 0.020% and S not more than 0.005%; (3) the steel plate has denser internal quality and can meet the requirement of the JB/T1271-2002 forging detection standard; and (4) the maximum thickness of the steel plate can reach 226mm.

Large-thickness rolled steel plate instead of case one for large-sized ball mill and production method thereof

Large-thickness hydrogen sulfide corrosion resistant steel plate and production method thereof

The invention discloses large-thickness hydrogen sulfide corrosion resistant steel plate and production method thereof. The production method comprises a smelting process, a continuous casting and electroslag remelting process, a heating process, a rolling process, a water-cooling process and a heat treating process; the steel plate comprises the following chemical components in percentage by mass: 0.19-0.20% of C, 0.25-0.35% of Si, 1.15-1.20% of Mn, not more than 0.006% of P, not more than 0.002% of S, 0.15%-0.20% of Ni, 0.13%-0.20% of Cr and the balance of Fe and unavoidable impurities. The steel quality of the steel plate is more pure, P is not more than 0.008%, and S is not more than 0.003%, lamellar tearing resistance is good, the through thickness direction Z is not less than 36%, the low temperature toughness at -50 DEG.C is good; and the maximum thickness of the steel plate can achieve 200mm. The steel plate produced by using the method disclosed by the invention has high purity ...

Steel plate for heavy-duty generator and manufacturing method thereof

The invention discloses a steel plate for a heavy-duty generator. The steel plate is formed by smelting the following components according to weight percent: 0.18-0.21% of C, 0.10-0.30% of Si, 1.10-1.25% of Mn, less than or equal to 0.018% of P, less than or equal to 0.005% of S, less than or equal to 0.008% of N, 0.020-0.050% of TAL, 0.020-0.035% of Nb, less than or equal to 0.44% of Ceq, the balance of Fe and inevitable impurities. The delivery state of the invention is normalization. The steel plate for a 274-280mm heavy-duty generator which is milled instead of forged and produced by using the normalizing technique has a better toughness index after being fully stacked and grain refined. By using II type rolling control technique and rolling in two steps, the invention solves the problem that the size of the grain is uneven and the impact toughness is decreased and increases the thickness size of the producible steel plate.

High intensity steel plate and preparation method thereof

The invention relates to a 100Kg level high tensile steel plate with the yield strength not less than 890Mpa. The steel plate comprises the following chemical components by weight percentage: less than or equal to 0.18 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 1.50 of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, less than or equal to 1.20 percent of Ni, less than or equal to 0.90 percent of Cr, less than or equal to 0.08 percent of V, less than or equal to 0.060 percent of Nb, less than or equal to 0.030 percent of Ti, less than or equal to 0.0030 percent of B, less than or equal to 0.60 percent of Mo, 0.020 to 0.060 percent of Al, and the balance being Fe and unavoidable impurities. Through the reasonable design of the alloy components and mainly the control on the quenching and tempering process, the obtained steel plate has a thickness of up to 100mm, high yield strength, high welding performance, high cold ...

Weather-resistance bridge high-strength steel plate and production method thereof

The invention discloses a weather-resistance bridge high-strength steel plate and a production method thereof. The weather-resistance bridge high-strength steel plate is prepared from the following components in percentage by weight: less than or equal to 0.11 percent of C, 0.30 to 0.50 percent of Si, 1.10 to 1.35 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.006 percent of S, 0.25 to 0.40 percent of Ni, 0.04 to 0.08 percent of V, 0.025 to 0.045 percent of Nb, 0.010 to 0.040 percent of Alt, 0.45 to 0.70 percent of Cr, 0.25 to 0.40 percent of Cu, 0.02 to 0.08percent of Mo, 0.015 to 0.025 percent of Ti, less than or equal to 0.015 percent of N and the balance of Fe and inevitable impurities. The invention also relates to a production method of the weather-resistance bridge high-strength steel plate. The steel plate has excellent obdurability matching, high yield strength, high weather resistance and high cold-workability. The steel quality is purer, and ...

High intensity steel plate and preparation method thereof

The invention relates to a 100Kg level high tensile steel plate with the yield strength not less than 890MPa. The steel plate comprises the following chemical components by weight percentage: less than or equal to 0.18 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 1.50 of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, less than or equal to 1.20 percent of Ni, less than or equal to 0.90 percent of Cr, less than or equal to 0.08 percent of V, less than or equal to 0.060 percent of Nb, less than or equal to 0.030 percent of Ti, less than or equal to 0.0030 percent of B, less than or equal to 0.60 percent of Mo,0.020 to 0.060 percent of Al, and the balance being Fe and unavoidable impurities. Through the reasonable design of the alloy components and mainly the control on the quenching and tempering process, the obtained steel plate has a thickness of up to 100mm, high yield strength, high welding performance, high cold ...