Method for making high intensity non-magnetic non-corrodible steel tauten screw rod

A technology of non-magnetic stainless steel and tightening screw, which is applied in the field of metallurgy to achieve the effect of less investment, simple equipment and lower cost

Inactive Publication Date: 2008-01-30
上海加宁新技术研究所
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The existing low magnetic steel with a magnetic permeability μ≤1.5-1.2 can no longer meet the needs. For large generator sets, in order to reduce the eddy current loss, if th

Method used

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Examples

Experimental program
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Example Embodiment

[0014] Embodiment: The manufacturing method of this embodiment is as follows:

[0015] 1. Substitute nickel with manganese (Mn) and nitrogen (N), such as 55Mn18Cr4N, Mn (17-19%), Cr (3-5%), N (0.20-0.45%), to become nickel-free and non-magnetic steel, Since nitrogen (N) is difficult to add to steel, it is baked into nitrogen compounds, the nitrogen compounds are ferrochromium nitride (Fe-Cr-N), or ferromanganese nitride (Fe-Mn-N), or two The combination of the two is added to the molten steel. The added amount of nitride accounts for 20-30% by weight of the whole raw material, and 70-80% of the original ecological scrap steel is added, which is smelted into a steel ingot by an electric arc furnace. The original ecological steel is the material cut from iron ore after smelting into steel. It does not enter the society, does not contain dirt, oil, and has less impurities.

[0016] Usually, there are many impurities and inclusions in the molten steel, but non-magnetic stainless...

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PUM

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Abstract

The invention relates to metallurgy field, in particular to a manufacturing method of a corrosion resistant, high strength non-magnetic stainless pulling bolt. The manufacturing method is that: original waste steel with a weight ratio accounted for 70 to 80 percent of the whole material, and nitride with a weight ratio accounted for 20 to 30 percent of the whole material are added during the melting process of steel rods and steel ingots. The original waste steel refers to the first stage waste steel with less impurities that is cut after the ore is smelt into steel, and has the advantages of high manganese and high nitrogen instead of nickel, good quality, lowering cost by 30 to 50 percent, and the intensity of manufactured pulling screws Sigma b is more than or equal to 1000Mpa, magnetic permeability Mu is less than or equal to 1.005, roughness Ra is equal to or less than 0.8Mum, the invention can meet the technical requirements of large turbine generators with a power of 600Mkw or 1000Mkw.

Description

technical field [0001] The invention relates to metallurgy, in particular to a method for manufacturing a corrosion-resistant, high-strength, non-magnetic stainless steel tension screw. Background technique [0002] With the advancement of science and technology, turbogenerators are getting bigger and bigger, from 300,000 kilowatts to 1,000,000 kilowatts, and the strength requirements for the tension screws used to fix the silicon steel sheet frame of the turbogenerator stator are also getting higher and higher. . The tension screw of the earliest steam turbine generator is 304 (1Cr18Ni10), 316 (0Cr17Ni12Mo2), but the material strength σ b =500Mpa, magnetic permeability difference μ=1.2, high nickel content, expensive. Later, Westinghouse Corporation of the United States and Siemens Corporation of Germany used 1Cr18Mn12NiN to replace 304, 316, and 600,000-kilowatt steam turbine generator sets with tension screw strength σ b =650-760Mpa, magnetic permeability μ=1.02, which...

Claims

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Application Information

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IPC IPC(8): F16B35/00H02K1/12C22C33/04C22C38/00C21D8/00
Inventor 陈菊生
Owner 上海加宁新技术研究所
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