Free-cutting and corrosion-resisting non-magnetic high manganese steel balance block for compressor

Abstract

A free-cutting and corrosion-resisting non-magnetic high manganese steel balance block for a compressor belongs to the technical field of metallurgy, and is characterized by comprising the following components in percentage by weight: 10-19 percent of Mn, 5-12 percent of Cr, not more than 0.8 percent of Cr, not more than 1.5 percent of Cu, not more than 0.3 percent of S, not more than 1.0 percent of Si, and Fe in balancing amount. The free-cutting and corrosion-resisting non-magnetic high manganese steel balance block disclosed by the invention has the advantages of reasonable formula, low cost of materials, freeness of lead for realizing environment friendliness, free-cutting processing, stable cold-processing magnetism and favorable corrosion resistance. Inclusions such as manganese sulfide and copper in a free state are respectively formed by adding S and Cu elements; the tissue continuousness of an alloy steel substrate is interrupted and the cutting difficulty is reduced; meanwhile, the residue of carbide is reduced by properly reducing the component of C element; the corrosion-resisting capability of the non-magnetic high manganese steel is improved by adding Cr element; and meanwhile, the stability of a non-magnetic high manganese steel austenite is ensured by reasonably adjusting the proportions of the C element, the Mn element and the Cr element, i.e., the magnetic stability during cold processing is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a free-cutting, corrosion-resistant, non-magnetic, high-manganese steel balance block for a compressor. Background technique [0002] Considering the cost reduction of materials, the use of non-magnetic high-manganese steel balance blocks to replace brass balance blocks in the air-conditioning compressor industry has become more and more common. The use of lost-wax precision casting technology to produce non-magnetic high-manganese steel balance blocks shows its unique advantages. Its advantage is that it can be cast to manufacture balance weights with arbitrary shapes and complex structures, especially thin-walled integral balance weights for frequency conversion compressors, providing compressor customers with optimized balance weight design and compact compressor space. great help. But it also has more prominent problems. First, the non-magnetic high manganese ...

AI Technical Summary

Problems solved by technology

But it also has more prominent problems. First, the non-magnetic high manganese steel produced by casting has the problem of poor size consistency, which is caused by the inherent large solid-liquid volume shrinkage of non-magnetic high manganese steel. The degree of solidification and shrinkage of each part of the balance weight is quite different, the hole deformation is serious, and the size consistency is poor, which brings great trouble to the production quality.

The second is that there are many phenomena such as casting iron clamping, and the scrap rate is high

[0003] Invention patent application number 200610132409.4 discloses an austenitic non-magnetic stainless free-cutting steel, its composition: C≤0.09%, Si≤1.00%, Mn is 7.5%-8.5%, P≤0.20%, 0.20%≥ S≥0.15%, Cr is 16.0%-18.0%, Ni is 3.0%-3.5%, Mo≤0.2%, Cu is 2.0%-3.0%, and N is 0.05%-0.15%. There are two problems in this invention, One is that the Cr content is high and the precious metal Ni is used, and the material cost is high; the other is that the C and Mn content is low, which is not conducive to the filling ability of molten steel casting

[0005] Invention patent application number 200610116831.0 discloses a non-magnetic alloy balance weight for compressors, its composition: manganese: 16.00-30.00%, carbon: 0.06-0.30%, aluminum: 0.50-2.50%, vanadium: 0.04-0.10%, and the rest is iron and unavoidable Trace impurities, the invention needs to be heat-preserved for 15 to 24 hours for solution heat treatment, the production process is complicated, and the cost is high; and the high Mn content leads to poor cutting performance and is difficult to process

[0006] Invention patent application number 2201110219665.8 discloses a high manganese steel balance weight for frequency conversion compressors, its composition: C0.2%~1.5%, Mn13~25%, S≤0.1%, P≤0.1%, Si≤1%, Cr ≤5%, Ni≤2%, Fe balance, the invention has low Cr content, low corrosion resistance, and cannot meet specific requirements; in addition, the use of precious metal Ni, the material cost is high

[0007] Utility Model Patent No. 200720066183.2 discloses a balance device for air conditioner compressors and refrigerator compressor motors made of non-magnetic steel. Its Al content is between 1.0 and 4%. As we all know, Al is a strong oxidant. To accurately control its content in molten steel, electric furnaces, converters, and open hearth furnaces in large steel plants can be effectively controlled. It is difficult to control the composition content in smelting in the capacity intermediate frequency furnace, and it is difficult to guarantee the production quality