Technique for manufacturing steel plate for 600MPa hydropower steel penstock

A pressure steel pipe and production process technology, which is applied in the production process field of steel plates for 600MPa hydraulic pressure steel pipes, can solve the problems of high cooling equipment performance requirements, inability to be widely promoted, and increased rolling load, etc., and achieve excellent low temperature impact toughness and welding performance, improving productivity, and reducing process costs

Inactive Publication Date: 2013-04-17
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese Patent Publication No. CN1932063A discloses a "High Strength Low Welding Crack Sensitivity Thick Steel Plate and Its Production Method", which is produced by online direct quenching + offline tempering process Steel plates with tensile strength ≥ 610MPa have the characteristics of simple production process and low cost. The disadvantage is that online direct quenching requires high performance of cooling equipment and cannot be widely promoted.
[0005] Chinese Patent Publication No. CN101096738A discloses "Steel Plate with L

Method used

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  • Technique for manufacturing steel plate for 600MPa hydropower steel penstock
  • Technique for manufacturing steel plate for 600MPa hydropower steel penstock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Smelt according to the chemical composition shown in Table 1, and cast into steel ingots, heat the steel ingots to 1232 ° C, keep the temperature in the furnace for 300 minutes, and carry out the first stage rolling on the experimental rolling mill, that is, rolling in the austenite recrystallization zone , the rolling start temperature is 1214°C, the reduction in the first to second passes should be greater than 10%, followed by at least 1 to 2 pass reductions controlled at 20 to 40%, when the thickness of the rolled piece is 60mm, the rolling Wait for the temperature to reach 900°C on the road, and then carry out the second stage of rolling, that is, rolling in the austenite non-recrystallized region. The final rolling temperature is 840°C, and the thickness of the finished steel plate is 20mm. After rolling, the steel plate enters the accelerated cooling (ACC) device and is cooled to 590°C at a rate of 5°C / s, and the cooling bed is cooled after the water exits. Afte...

Embodiment 2

[0025] The implementation is the same as in Example 1, wherein the heating temperature is 1240°C, the total time in the furnace is 320 minutes, the rolling start temperature of the first stage rolling is 1220°C, the thickness of the intermediate billet is 96mm, and the rolling start temperature of the second stage rolling is The temperature is 892°C, the final rolling temperature is 831°C, and the thickness of the finished steel plate is 38mm. After rolling, the steel plate enters the accelerated cooling (ACC) device and is cooled to 589°C at a rate of 5°C / s, and the cooling bed is cooled after the water exits. Afterwards, the steel plate is subjected to tempering heat treatment, the tempering temperature is 630°C, and the holding time is 20min+t×2.5min / mm, where t is the thickness of the steel plate in mm. Finally, the steel plate can be obtained

Embodiment 3

[0027] The implementation is the same as in Example 1, wherein the heating temperature is 1233°C, and the total time in the furnace is 340 minutes; the rolling start temperature of the first stage rolling is 1218°C, and the thickness of the intermediate billet is 100mm; the rolling start temperature of the second stage rolling is 892°C, the final rolling temperature is 821°C, and the thickness of the finished steel plate is 50mm; after rolling, the steel plate enters the accelerated cooling (ACC) device, and is cooled to 558°C at a rate of 5°C / s, and the cooling bed is cooled after the water exits. Afterwards, the steel plate is subjected to tempering heat treatment, the tempering temperature is 610°C, and the holding time is 20min+t×2.5min / mm, where t is the thickness of the steel plate in mm. Finally, the steel plate can be obtained

[0028] Table 1 Chemical composition (wt%) of the present invention embodiment 1~3

[0029] Example C Si mn P S Nb V Ti ...

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Abstract

The invention provides a technique for manufacturing a steel plate for a 600MPa hydropower steel penstock. The steel plate comprises the following chemical components in weight percentage: 0.06-0.09% of C, 0.20-0.40% of Si, 1.4-1.6% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.02-0.04% of Nb, 0.20-0.40% of Ni, 0.10-0.30% of Cr, 0.10-0.30% of Mo, 0.03-0.05% of V, 0.01-0.02% of Ti and the balance of Fe and inevitable impurities. Through a low-carbon microalloying design, a thermo-mechanical control process (TMCP) and a tempering process (T), a metallographic structure mainly based on a tempered bainite is ultimately obtained, thus achieving good matching of strength, plasticity, toughness and weldability, reducing the production cost and improving the production efficiency. The steel plate is mainly used for manufacturing the hydropower penstock.

Description

technical field [0001] The invention belongs to the field of low-alloy steels, and in particular relates to a production process of steel plates for 600MPa grade hydraulic steel pipes. Background technique [0002] Steel for hydropower is mainly used in the manufacture of auxiliary facilities such as water diversion pressure pipes, primary ribs, branch pipes, and volutes in plant dams. The steel plates are required to have sufficient strength, good plasticity, excellent toughness and welding performance. As the installed capacity and water head of hydropower stations become larger and larger, higher requirements are put forward for steel plates—the use of steel plates with higher strength, better low-temperature toughness, and better welding performance. At present, domestic hydropower stations Pressure steel pipes mainly use 600MPa-grade steel plates. Since GB19189-2011 "Quenched and Tempered High-Strength Steel Plates for Pressure Vessels" clearly stipulates that steel pla...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/50C21D8/02C21D1/18C21D8/10C21D11/00
Inventor 杨雄史文义王海明李海英康利明刘莉张辉
Owner INNER MONGOLIA BAOTOU STEEL UNION
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