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Austenitic free-cutting stainless steel

A kind of austenitic stainless steel, high-speed cutting technology, applied in the field of austenitic stainless steel

Inactive Publication Date: 2008-10-01
DAIDO STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to the rare source of Bi, there are no reports on other free-cutting elements that can replace the free-cutting element Pb with a free-cutting effect equivalent to that of the free-cutting element Pb (brittleness caused by liquid metal)

Method used

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  • Austenitic free-cutting stainless steel
  • Austenitic free-cutting stainless steel
  • Austenitic free-cutting stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 42 and comparative example 1 to 13

[0172] Alloys having the chemical compositions described in Table 1 and Table 2 were each melted and cast by using a high-frequency induction furnace to obtain 50 kg of ingots. Then, the ingot was uniformly heated, followed by hot forging to form a round bar with a diameter of 24 mm. The round bars thus obtained are then subjected to heat treatment. Heat treatment was performed by leaving the round bar at 1150° C. for 1 hour, followed by cooling with water.

[0173] Table 1

[0174]

[0175] Table 2

[0176]

[0177] 2. Evaluation(1)

[0178] The resulting round bar was evaluated next.

[0179] (1) Composition of inclusions

[0180] After the heat treatment, component analysis was performed on randomly selected oxide samples (30 samples) by using EPMAD. As a result of component analysis, those in which B was confirmed in 15 or more oxide samples are indicated by "A", and those in which B was confirmed in 15 or less oxide samples Den...

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Abstract

The present invention relates to an austenitic free-cutting stainless steel, containing: by weight percent, 0.500% or less of C; 0.01 to 5.00% of Si; 0.01 to 10.00% of Mn; 5.00 to 25.00% of Ni; 7.50 to 30.00% of Cr; 0.300% or less of N; more than 0.0100% but not more than 0.1000% of 0; 0.0020 to 0.1000% of B; 0.300% or less of Al; and the remainder of Fe and inevitable impurities, the steel satisfying the following formula (1): 0.68<=[O] / [B]<=2.50 (1) in which [O] represents the content of O and [B] represents the content of B.

Description

technical field [0001] The invention relates to an austenitic stainless steel that can be cut at high speed. Background technique [0002] Since austenitic stainless steel contains a relatively high content of alloying elements (such as Cr or Ni), the raw material itself is relatively expensive compared to the raw material of ordinary steel. Therefore, in order to reduce the production cost of the entire component, it is important to improve its workability. Hitherto, in applications requiring high-speed cutting performance, high-speed-cuttable stainless steels (such as SUS303) containing elements for improving cutting performance (such as Pb or S) have been used. [0003] However, it is not preferable to add Pb, a typical easy-cutting element, to steel materials from the viewpoint of environmental protection in recent years. In addition, the easy-cutting element S forms sulfides (such as MnS) in steel, thereby improving machinability. However, since a large amount of sul...

Claims

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Application Information

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IPC IPC(8): C22C38/54C22C38/56C22C33/04C21D1/00
CPCY02E50/12C21D2211/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/16C22C38/22C22C38/40C22C38/54C22C38/60
Inventor 江渡寿郎清水哲也
Owner DAIDO STEEL CO LTD
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