Low magnetism steel resisting sea water corrosion

Abstract

The present invention relates to alloy steel production, and is especially low magnetism stainless steel resisting sea water corrosion. The low magnetism stainless steel resisting sea water corrosion features its components including C not more than 0.04 wt%, N 0.2-0.5 wt%, Cr 21-23 wt%, Ni 12-14 wt%, Mo 2.0-3.5 wt%, Mn 4-6 wt%, Nb 0.05-0.25 wt%, S not more than 0.03 wt%, P not more than 0.035 wt%, and Fe and impurity. Compared with available technology, the material of the present invention has the advantages of high strength, high plasticity, high toughness, low magnetic conductivity, stable magnetic performance, excellent corrosion resistance, capacity of resisting sea water corrosion, low production cost, etc.

Description

Technical field [0001] The invention relates to the manufacturing field of alloy steel. It is especially suitable for manufacturing low-magnetic stainless steel that is resistant to seawater corrosion. Background technique [0002] Corrosion-resistant alloy steel is currently one of the main materials widely used in the fields of petroleum, chemical industry, shipbuilding, construction, machinery, etc., especially under the special requirements of petroleum exploration, ship construction, and aviation instrumentation in the marine environment. There are corrosion-resistant low-magnetic steel materials with high strength, good corrosion resistance and low magnetic properties. [0003] In the prior art, the structure of corrosion-resistant low-magnetic steel generally uses austenite-based stainless steel. For example, the traditional low-magnetic steel is Mn-Al series. Although this type of steel is low in cost, the disadvantage of this steel is that its processing performance, wel...

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Problems solved by technology

For example, the traditional low-magnetic steel is Mn-Al series. Although the cost of this type of steel is relatively low, the disadvantages of this steel are that its processing performance, welding process and corrosion resistance are poor, and it basically cannot meet the requirements of corrosion-resistant low-magnetic steel. Requirements

In addition, Cr-Mn-Ni-N 200 series austenitic stainless steel is a production technology that uses Mn and N instead of Ni, and it is also relatively economical, and it also has certain low magnetic properties, but this low magnetic properties cannot Meet the requirements of use, its relative magnetic permeability μr is generally greater than 1.02, especially in the cold deformation state, the performance is worse, and the corrosion resistance of the steel is not ideal

Then there are high-grade Cr-Ni austenitic stainless steels, such as 904L and other corrosion-resistant low-magnetic stainless steels. Although this type of low-magnetism and seawater corrosion resistance are relatively good, the manufacturing cost of high-grade austenitic stainless steels is relatively high. , and the use performance and strength are low

There is also a Nitronic 50 steel introduced by the American Armoco Company. Since this steel adopts the design principle of Nb and V elements as the dual stabilization of austenitic stainless steel, although it has excellent comprehensive performance, it must use Nb due to the high C content. , V double element is stable, its manufacturing cost is too high, not economical enough

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