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Alloy steel for large wind-driven power generation device and manufacturing process of workpiece made of same

A manufacturing process and technology of alloy steel, which is applied in the field of manufacturing process of alloy steel and its workpieces for large-scale wind power installations, can solve the problems of unreachable impact value and insufficient plastic toughness, and achieves improved impact toughness at low temperature, high resistance to The effect of improving the corrosion rate of atmospheric and marine atmospheres

Active Publication Date: 2011-10-12
JIANGYIN HENGRUN HEAVY IND
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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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  • Alloy steel for large wind-driven power generation device and manufacturing process of workpiece made of same
  • Alloy steel for large wind-driven power generation device and manufacturing process of workpiece made of same
  • Alloy steel for large wind-driven power generation device and manufacturing process of workpiece made of same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] 1. The production process is as follows:

[0075] Hot metal pretreatment-converter smelting-furnace refining-casting ingot (15T~30T)-flame cleaning-heating-forging-slow cooling-heat treatment-machining-flaw detection-inspection-packaging and storage.

[0076] 2. Preparation steps

[0077] The first step hot metal pretreatment

[0078] 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.

[0079] The second step converter steelmaking

[0080] 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 purpose of con...

Embodiment 2

[0105] 1. Production process

[0106] Charge - electric furnace - refining outside the furnace - continuous casting (round billet diameter 600 ~ 800mm) - flame cleaning - heating - forging - slow cooling - heat treatment - machining - flaw detection - inspection - packaging and storage.

[0107] 2. Preparation steps

[0108] The first step charge

[0109] Furnace charge is made of clean steel scrap (including returned alloy steel), pig iron and ferromolybdenum alloy, slagging agent (lime lime Cao), etc.

[0110] The second step electric furnace steelmaking

[0111] Add the batching raw materials into the 60-ton capacity EAF electric arc furnace in turn, and then heat and melt the furnace charge, and test the chemical components such as C, Si, Mn, P, S, Cr, Mo in the steel. When the carbon content reaches 0.7% to 0.9%, add Slagging agent, lime, clay bricks, fluorite and other slagging agents; the alkalinity is 2.5~3.0, the temperature of molten steel is 1590℃~1610℃, after th...

Embodiment 3

[0132] 1. Production process

[0133] 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 - packaging and storage

[0134] 2. Preparation steps

[0135] Steps 1, 2, and 3 are the same as in Embodiment 2, and will not be described in detail here.

[0136] Step 4 Continuous casting adopts the following new technical measures:

[0137] 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.

[01...

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Abstract

The invention discloses alloy steel for a large wind-driven power generation device and a manufacturing process of a workpiece made of the same. The alloy steel contains the following chemical components: 0.30-4.0wt% of carbon, 0.30-0.80wt% of silicon, 1.20-1.80wt% of manganese, no more than 0.025wt% of phosphorus, no more than 0.015% of sulfur, 1.00-1.60wt% of chromium, 0.50-0.90wt% of molybdenum, 0.20-0.35wt% of vanadium, 0.05-0.12wt% of nitrogen, 0.02-0.07wt% of rare earth, and the balance of iron and inevitable impurities. The manufacturing process of a workpiece made of the alloy steel comprises the following steps: pretreating molten iron; smelting in a converter; carrying out external refining; casting into steel ingots; carrying out flame cleaning; heating; forging; annealing; carrying out heat treatment; mechanically processing; carrying out fault detection; checking; packaging; and warehousing. Compared with the alloy steel currently used by domestic and foreign wind-driven power generation stations, the tensile strength, yield strength, breakage elongation and percentage reduction in area of the alloy steel disclosed by the invention are all improved, and the low-temperature impact ductility is obviously improved. The atmospheric corrosion resistance rate and marine atmospheric corrosion resistance rate are both improved by two ranks.

Description

technical field [0001] The invention relates to alloy steel used in wind power equipment, and a method for making workpieces with the alloy steel, in particular to a new type of high-strength, high-toughness, low-temperature-resistant alloy structural steel and its workpiece for super-large-diameter wind power generators The manufacturing process, 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 an...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/24C22C33/06C21D3/06C21D1/18C21D8/02B22D11/115B22D11/111B22D11/16B22D11/22
Inventor 周洪亮戴宝昌沈忠协朱杰缪检
Owner JIANGYIN HENGRUN HEAVY IND
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