JPS61183451A - High strength, nonmagnetic and corrosion resistant member - Google Patents

Abstract

PURPOSE:To obtain a high strength, nonmagnetic and corrosion resistant member used for various machines or apparatus by adding specified amounts of Mn, Cr, V, C, N, Mo and Ni to Fe. CONSTITUTION:An alloy having a composition consisting of, by weight, 15-30% Mn, 10-25% Cr, 0.3-3% V, <0.3% C, 0.2-1% N, <5% Mo, 0.5-10% Ni and the balance Fe with accompanying impurities is melted in a high frequency melting furnace under pressure, and the molten alloy is cast into an ingot. This ingot is hot forged, hot rolled, heated at about 1,150 deg.C for about 1hr, cooled and aged at about 700 deg.C for about 5hr.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to q! R-type machines, machines, etc.: High-strength, non-magnetic, corrosion-resistant members used (= related to).

[Technical background and problems of the invention]

Conventionally, Cr Ni-Fe austenitic stainless steel, Mn-C-Fe or Mn-C-Cr-Fe high manganese non-magnetic steel have been known as the non-magnetic steel used. It is being

However, the former Or-Ni-Fe-based austenitic stainless steel has low yield strength, and the latter high-manganese nonmagnetic steel has drawbacks such as poor corrosion resistance.

[Purpose of the invention]

This invention is 4! The purpose is to provide materials such as RM's Shinki, Shinki, etc. (= good non-magnetic, high-strength, large-durability parts.

[Summary of the invention]

The present invention is based on the fact that as a result of extensive experimental studies on conventional non-magnetic high manganese rust C, it has been found that with a limited chemical composition (2), it is possible to obtain non-magnetic strength and corrosion resistance (2).

That is, the present invention (2) the sieve strength and non-magnetic corrosion-resistant member w
It percentage is Mn 15・-30%, Cr 1
0-25%.

Vo, 3~3.0'I C0, 3% or less, N0.2
~1.0*.

It is a high-strength, large-durability member consisting of Mo 5% or less + Nio 5 to 10%, the balance Fe and vertical impurities.

Here, two reasons for limiting the composition of the high-strength non-magnetic corrosion-resistant member according to the present invention will be explained.

Mn (manganese) is an ausbunite-forming element, and in order to obtain nonmagnetism as stable austenite, at least 15 or more is required. However, since a large amount of content deteriorates the processing method, the content is limited to 30% or less.

In addition, if you are assured that the heat resistance is small as a one-strength tribute-resistant member (= = 27% of the earth-containing material)
It is desirable to keep it at a certain level.

Cr (chromium) improves corrosion resistance and improves the strength of the casing (25) It is a necessary element and must be present in an amount of at least 10%, but containing a large amount promotes the formation of ferrite and reduces workability. Let's do it in a box.

■(Vanadium) is an essential element that improves strength than solid solution strengthening (2), and also increases work hardening (2) and improves strength than aging (2), and is an essential element that improves strength (2). .3% or more is necessary, and if it exceeds 8.0 inches, workability deteriorates and ferrite is generated, making it non-magnetic, so this range is set.

C (carbon) stabilizes austenite and solid solution strengthens it (11
9. It is an element that improves strength, but its content is limited to 0.3% or less since its inclusion in large amounts impairs corrosion resistance.

Like C, N < 51 element) is an element that stabilizes austenite and also strengthens the austenite (solid solution strengthening). However, it is difficult to make a bath if it contains a large amount (1.
It was set to 096.

Mo (molybdenum) is an element that improves corrosion resistance and strength, but addition of a large amount impairs workability and produces ferrite, making it non-magnetic, so the content was limited to 5.0%.

Ni (nickel) is an element that stabilizes austenite and improves its toughness9, and at least 0.5% is necessary, but if it exceeds 10%, the effect is saturated (because a decrease in the two-strong relationship is observed). This is the range.

Note that it is possible to add Cu(1) nitrate for the purpose of improving corrosion resistance, and to add SiL:DiO for the purpose of deoxidizing during bath decomposition.

[Embodiments of the invention]

An alloy having the composition shown in FIG. 1 was cast using a pressurized Yashima frequency static furnace to obtain an ingot.

Next, hot forging and hot rolling were performed, followed by heating at 1150° C. for 1 hour and cooling.

Part 1: Agahikisa Tsuzuki @ 700℃ for 5 hours After removing the tin salt,
As a test, I cut out a piece of paper and tried it out.

Tests included a tensile test, corrosion test, and magnetic permeability measurement. Trial IIL results are shown in Table 2.

In addition, the rotten test was immersed in 3rd grade NaCJ water shell for 14 days and six sides were infected; Ff1+di Shiyu.

Below is the blank space No. 2 [Effects of the invention] 42 & As is clearer (comparison between the two? lJ 3 is the invention (effects of the invention)
Although it has the same strength and corrosion resistance as Example 1.2.3, it is not non-magnetic, and Comparative Example 2 is non-magnetic but has poor corrosion resistance.

As mentioned above (2) High strength non-magnetic resistant part according to the present invention
The material has excellent strength and magnetic permeability, and also has C2 corrosion resistance (which is behind the times), making it a useful material for industrial use.

Claims (1)

[Claims] Mn 15-30%, Cr 10-25% in weight percentage
, V0.3-3.0%, C0.3% or less, N0.2-1
．． 0%, Mo 5% or less, Ni 0.5-10%, remaining Fe and incidental impurities.