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High-strength untempered steel for fracture splitting and steel component for fracture splitting

A non-quenched and tempered steel, high-strength technology, applied in the field of non-quenched and tempered steel for high-strength fracture splitting, can solve the problems of poor yield strength and durability strength, reduced ductility, etc., and achieve excellent fracture splitting and small deformation , Excellent thermal ductility

Active Publication Date: 2010-11-10
NIPPON STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the carbon composition is high, the ductility will decrease, so the advantages of easy fracture processing and small deformation at the time of fracture can be obtained, but on the other hand, there are disadvantages such as poor yield strength and durability

Method used

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  • High-strength untempered steel for fracture splitting and steel component for fracture splitting
  • High-strength untempered steel for fracture splitting and steel component for fracture splitting
  • High-strength untempered steel for fracture splitting and steel component for fracture splitting

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Embodiment

[0183] Hereinafter, the present invention will be described in detail based on examples.

[0184] 16 kg each of the inventive steel (Examples 1 to 24) and comparative steel (Comparative Examples 26 to 39 and conventional materials) having the compositions shown in Table 1 were melted into ingots in a vacuum melting furnace. These melted ingots were heated to 1493K, forged and stretched into steel bars with a diameter of 55 mm, and then left to cool to be used as raw materials for evaluation.

[0185] Table 1 is as follows:

[0186]

[0187] First, thermal ductility in the period immediately after melting-solidification of raw materials was evaluated by a thermal tensile test. The test piece was made into a rod shape with a diameter of 1.0 mm and a length of 100 mm, the center of the test piece was covered with a quartz tube, and a thermocouple was attached.

[0188] Install it on an electric heating device equipped with a tensile device, and while cooling both ends with a...

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Abstract

A high-strength untempered steel for fracture splitting and a steel component for fracture splitting comprising C: 0.23-0.35%, Si: 0.70-1.30%, Mn: 0.76-1.17%, P: 0.040-0.080%, S: 0.040-0.118%, Cr: 0.05-0.20%, Al: 0.010% or less, V: 0.27-0.45%, N: 0.0050-0.0145%, by mass percent, and the remainder Fe and unavoidable impurities, and comprising a ferrite-pearlite structure wherein the values of the composition restraints for three components satisfy the prescribed values, hot rolling properties are ensured, and the ferrite fraction is at least 60% when air cooled or cooled with forced air after hot casting.

Description

technical field [0001] The present invention relates to: a high-strength non-quenched and tempered steel for fracture division that is used as a raw material for steel parts used for fracture division after hot casting the steel part and then applying predetermined cooling; Steel is a high-strength, fracture-splitting steel part with excellent fracture-splitting properties manufactured from raw materials. Background technique [0002] Non-quenched and tempered steels for hot forging (hereinafter referred to as non-quenched and tempered steels), which can omit quenching and tempering treatment, are used in recent automobile engine forged parts and chassis forged parts. Non-quenched and tempered steel is steel whose composition is designed so that even in the state cooled by air cooling or air cooling after hot forging, the conventional quenching and tempering treatment can be omitted. Excellent mechanical properties. [0003] As one of the components to which non-quenched a...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C38/38C22C38/60
CPCC22C38/02C22C38/06C22C38/04C22C38/001C22C38/24
Inventor 高田启督寺本真也福田晋作
Owner NIPPON STEEL CORP
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