Manufacturing Method of 13mnnimo5-4 Cylinder Forging for Boiler Drum
A technology for a boiler steam drum and a manufacturing method, which is applied in the field of manufacturing 13MnNiMo5-4 cylinder forgings for boiler steam drums, can solve problems such as unfavorable safety angles of equipment, and achieve the effects of improving safety margin and excellent mechanical properties.
Active Publication Date: 2015-08-19
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD +1
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Problems solved by technology
[0006] 2. There are longitudinal welds in the steam drum made of steel coil welding, which is unfavorable from the perspective of the safety of the entire equipment
[0007] At present, there is no precedent for using 13MnNiMo5-4 forgings to manufacture boiler drum shells
Method used
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[0023] The manufacture method of the 13MnNiMo5-4 barrel forging for the boiler steam drum of the present invention is used to manufacture the 13MnNiMo5-4 barrel forging for the boiler steam drum with an outer diameter of not less than 2000mm, an inner diameter of not less than 1500mm, and a length of not less than 2500mm; comprising the following steps:
[0024] The first step is to forge the billet;
[0025] Heat the 13MnNiMo5-4 steel ingot that has been vacuum smelted and casted to 1200-1250°C, and forge it into a cylindrical forging with an outer diameter of not less than 2000mm, an inner diameter of not less than 1500mm, and a length of not less than 2500mm through integral forging;
[0026] The second step, heat treatment after forging;
[0027] Put the forging in the furnace and heat it to 600-700°C for 4-5 hours; then heat the forging to 900-960°C at a heating rate of ≤100°C / h for austenitization and heat preservation; the time for austenitization and heat preservation ...
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Abstract
The invention discloses a method for manufacturing a 13MnNiMo5-4 drum forged piece for a boiler drum, wherein the 13MnNiMo5-4 drum forged piece is not less than 2000mm in outer diameter, not less than 1500mm in inner diameter and not less than 2500mm in length. The method includes the steps: firstly, blank forging; secondly, heat treatment after forging; thirdly, property heat treatment. The 13MnNiMo5-4 drum forged piece is made by integrally forging a steel ingot which is made by vacuum smelting, and then subjected to an air-cooling quenching heating process. Compared with a conventional drum made of a steel plate by means of roll welding, the drum forged piece for the boiler drum has the advantages that the mechanical property is superior to similar steel plate rolled products and has no evident anisotropy, a longitudinal welding joint is reduced, and safety margin of whole equipment can be improved.
Description
technical field [0001] The invention relates to a manufacturing method of a boiler steam drum, in particular to a manufacturing method of a 13MnNiMo5-4 cylinder forging for a boiler steam drum. Background technique [0002] The boiler drum (also known as the drum) is the most important pressure component in the natural circulation boiler, which is commonly found in thermal power generating units of 300MW and below. The boiler steam drum is generally rolled and welded by 13MnNiMo5-4 steel plate. The performance requirements of 13MnNiMo5-4 steel plate are as follows: [0003] [0004] The disadvantages of 13MnNiMo5-4 steel plate are as follows: [0005] 1. The anisotropy of 13MnNiMo5-4 steel plate is obvious after rolling, that is, the longitudinal performance is significantly better than the transverse performance; [0006] 2. There are longitudinal welds in the steam drum made by coil welding of steel plates, which is unfavorable from the perspective of the safety of th...
Claims
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IPC IPC(8): B21J5/00C21D9/08C21D8/10C21D1/18
Inventor 宋雷钧涂而兴张灵芳陈永波
Owner SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD