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Wind power flange alloy steel and preparation technology of parts thereof

A technology of wind power flange and manufacturing process, which is applied in the field of wind power flange alloy steel and workpiece manufacturing technology, can solve the problems of insufficient impact value, insufficient plasticity and toughness, etc., and achieve low-temperature impact toughness improvement, atmospheric resistance and resistance Effects of increased marine atmospheric corrosion rates

Inactive Publication Date: 2012-05-02
江阴同庆机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, 42CrMoA alloy steel was usually used at home and abroad. Although it can basically meet the requirements in terms of high strength, it is still insufficient in terms of plasticity and toughness, especially the impact value of impact toughness at -30°C to -60°C does not reach 30J / cm 2

Method used

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  • Wind power flange alloy steel and preparation technology of parts thereof
  • Wind power flange alloy steel and preparation technology of parts thereof
  • Wind power flange alloy steel and preparation technology of parts thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] 1. The production process is as follows:

[0064] Hot metal pretreatment—converter smelting—external refining—casting billet (15T~30T)—sandblasting cleaning—heating—forging—natural cooling—heat treatment—machining—flaw detection—inspection—packaging and storage.

[0065] 2. Preparation steps

[0066] The first step hot metal pretreatment

[0067] Add 1% to 1.5% lime (CaO) according to the weight percentage of molten iron. The purpose is to further remove [P], [S], and [Si] from molten iron. After meeting the composition requirements of molten iron for steelmaking, pour it into the converter for smelting.

[0068] The second step converter steelmaking

[0069] The LD converter is smelted by oxygen blowing with oxygen lance. According to the molten steel temperature and composition ratio, steel scrap can be added to adjust the temperature and composition ratio of molten steel. At the same time, slagging agents (calcium oxide, fluorite, etc.) should be added. The main pu...

Embodiment 2

[0088] 1. Production process

[0089] Charge—electric furnace—external refining—continuous casting (round billet diameter 600-800mm)—flame cleaning—heating—forging—slow cooling—heat treatment—mechanical processing—flaw detection—inspection—packaging and storage.

[0090] 2. Preparation steps

[0091] The first step charge

[0092] Furnace charge is made of clean steel scrap (including returned alloy steel), pig iron and ferromolybdenum alloy, slagging agent (lime lime Cao), etc.

[0093] The second step electric furnace steelmaking

[0094] Add the batching raw materials to the 60-ton capacity EAF electric arc furnace in turn, heat and melt the furnace charge with electricity, and test the chemical components such as C, Si, Mn, P, S, Cr, Mo in the steel. When the carbon content reaches 0.25% to 0.60%, add Slagging agent, lime, clay bricks, fluorite and other slagging agents; the alkalinity is 2.5~3.0, the temperature of molten steel is 1690℃~1710℃, after the slag is removed...

Embodiment 3

[0110] 1. Production process

[0111] Ingredients—Electric Furnace (EAF)—External Refining (VAD)—Continuous Casting (round billet diameter φ600mm~φ800mm)—Flame Cleaning—Heating—Forging—Slow Cooling—Heat Treatment—Machining—Flaw Detection—Inspection—Packing and Storage

[0112] 2. Preparation steps

[0113] Steps 1, 2, and 3 are the same as in Embodiment 2, and will not be described in detail here.

[0114] Step 4 Continuous casting adopts the following new technical measures:

[0115] 1) Protective casting, in order to reduce the secondary oxidation of molten steel and the introduction of foreign inclusions into the steel, and improve the purity of the steel; use the tundish molten steel covering agent and mold mold slag, the ladle and the tundish are connected by a long nozzle, and the middle The molten steel enters the crystallizer through the submerged nozzle, and the nozzle is protected by argon gas and sealed with a fiber sealing ring.

[0116] 2) Implement dynamic sof...

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Abstract

The invention discloses wind power flange alloy steel and a preparation technology of parts thereof. The alloy steel comprises the following chemical compositions: carbon, silicon, manganese, phosphorus, sulfur, chromium, molybdenum, vanadium, nickel, copper, nitrogen, oxygen, hydrogen, rare earth and the balance of iron and the inevitable impurities. The preparation technology of the alloy steel parts comprises the following steps: pretreating molten iron, smelting in a converter, performing external refining, casting steel ingots, performing flame cleaning, heating, forging, slowly cooling, performing heat treatment, machining, performing flaw detection, inspecting, packaging and warehousing. Compared with the existing alloy steel used in the wind power generation at home and aboard, the alloy steel disclosed by the invention has higher tensile strength, yield strength, elongation after fracture and reduction of area, particularly higher low-temperature impact toughness. The atmosphere corrosion resistance and the sea atmosphere corrosion resistance are increased by two levels.

Description

technical field [0001] The invention relates to an alloy steel used for wind power towers and a method for making workpieces with the alloy steel, in particular to a novel high-strength, high-toughness, low-temperature-resistant alloy structural steel and its workpiece for super-large-diameter wind power generators The alloy steel is mainly used to manufacture large-scale wind turbine main shafts, wind power bearings, wind power gear billets, steel ingots, continuous casting billets, and heavy forgings such as flanges. Background technique [0002] With the rapid development of my country's industrial modernization, the energy gap is getting bigger and bigger; in recent years, the development of low-carbon economy has been proposed, and the development of new energy has attracted the attention of people all over the world. In particular, wind power has attracted much attention, because it is a renewable natural energy that does not produce any pollution emissions, and compar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C22C33/04
Inventor 刘侠胡协兴刘芳刘勇飚陈燕娟陆忠益
Owner 江阴同庆机械制造有限公司
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