Nickel-saving RE-containing austenitic stainless steel and its prepn

An austenitic and stainless steel technology, applied in the field of austenitic stainless steel and its preparation, can solve the problems of unscientific and reasonable composition design, poor corrosion resistance and high strength, saving precious nickel resources, reducing production costs, comprehensive good performance

Inactive Publication Date: 2006-05-17
CENT IRON & STEEL RES INST
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AI-Extracted Technical Summary

Problems solved by technology

In order to save nickel, the relevant domestic departments have researched and developed 200 or 201 chromium manganese nitrogen austenitic stainless steel ([Stainless Development] 2004, the first issue, pages 4-22; [World Metal Bulletin] 2004.9.7, total No. 1702 Period), currently in circulation in the market, but there are many problems with this type ...
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Abstract

The present invention belongs to the field of alloy steel, and is nickel-saving RE-containing austenitic stainless steel comprising C not more than 0.08 wt%, Si 0.3-0.8 wt%, Mn 5.0-8.5 wt%, S not more than 0.05 wt%, P not more than 0.04 wt%, Ni 3.0-5.5 wt%, Cr 14-19 wt%, Cu 1.0-4.0 wt%, N not more than 0.20 wt%, total O not more than 0.005 wt%, RE 0.05-0.3 wt% and Fe the rest. The preparation process of the stainless steel includes the technological steps of: smelting, casting at 1500-1650 deg.c, cogging at initial temperature of 1080-1240 deg.c and final forging temperature over 900 deg.c, rolling at initial temperature of 1100-1240 deg.c and final temperature over 900 deg.c, and solution treatment at 1050-1150 deg.c for 20-30 min. During the smelting, the molten steel has oxygen content not more than 50 ppm before RE is added, and RE is added in 30 sec before casting.

Application Domain

Temperature control deviceCasting safety devices +3

Technology Topic

Austenitic stainless steelForging +11

Image

  • Nickel-saving RE-containing austenitic stainless steel and its prepn
  • Nickel-saving RE-containing austenitic stainless steel and its prepn
  • Nickel-saving RE-containing austenitic stainless steel and its prepn

Examples

  • Experimental program(1)

Example Embodiment

[0049] According to the chemical composition of the nickel-saving austenitic rare-earth stainless steel of the present invention, three furnaces of the steel of the present invention were smelted in a non-vacuum induction furnace. The chemical composition (wt%) of the three furnaces is shown in Table 1. After smelting, it is cast into ingots, and then ingot blooming, steel rolling and solution treatment are carried out according to the process steps of its preparation method. The relevant parameters of smelting, casting, ingot blooming, steel rolling and solution treatment are shown in Table 2. Subsequently, the product steel samples were sampled, and the mechanical performance test and the corrosion performance test were carried out. The results obtained are listed in Table 3 and Tables 4 and 5 respectively.
[0050] For comparison, under the same equipment conditions, a furnace was also smelted and processed with other components the same as or similar to the present invention, but without rare earth elements added austenitic stainless steel comparison steel, its chemical composition and related parameters and performance are also different Listed in Table 1, Table 2, Table 3 and Table 4, 5. In the mechanical performance test, ASTM201 austenitic stainless steel and SUS304 austenitic stainless steel were also used as comparative examples, and the same test was carried out. The results are also listed in Table 3.
[0051] It can be seen from Table 3 that the mechanical properties of the steel of the present invention are far superior to ASTM201 austenitic stainless steel without rare earth "200 series", and close to SUS304 austenitic stainless steel.
[0052] The data in Table 4 shows that the corrosion potential of the nickel-saving austenitic rare-earth stainless steel of the present invention is increased by 50 mV after adding trace rare earths, and the passive current, which characterizes the corrosion rate in the passive state, is reduced by 0.5 mA, which characterizes the dynamic corrosion rate. The dull current is reduced by 0.5~1.0mA.
[0053] Table 5 shows that after adding trace rare earths, the intergranular corrosion rate of the nickel-saving austenitic stainless steel of the present invention decreases by 2.79g/(m2·h), the pitting corrosion rate decreases by 6.80g/(m2·h), and the wear corrosion rate decreases by 1.11 g/(m2·h).
[0054] Ingredients
[0055] Table 2 Examples and relevant parameters of the preparation process of the comparative example
[0056]
[0057]
[0058]
[0059]
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