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steel

A technology of steel and chemical composition, applied in the field of steel, can solve problems such as insufficient fracture splitting, and achieve excellent cracking properties, high fatigue strength, and high machinability

Active Publication Date: 2021-11-30
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, Al in the oxide-based inclusions 2 o 3 In the case of the main body, SiO 2 In the case of the main body, the breakability is insufficient

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment

[0209] Molten steels having the chemical compositions shown in Table 1 and Table 2 were produced.

[0210] [Table 1]

[0211] Table 1

[0212]

[0213] [Table 2]

[0214] Table 2

[0215]

[0216] Referring to Table 1, the chemical compositions of test numbers E-1 to E-40 and C-10 to C-16 are appropriate, the C content is 0.05% or more and less than 0.38%, and the formula (1) is satisfied. On the other hand, in test numbers C-1 to C-9, either the chemical composition was inappropriate or the formula (1) was not satisfied. In addition, the chemical composition of test number C-9 is within the range of the chemical composition of the steel described in patent document 5.

[0217] Referring to Table 2, the chemical compositions of the test numbers E-41-E-80 and C-25-C-31 are suitable, the C content is 0.38-0.55%, and the formula (2) is satisfied. On the other hand, test numbers C-17 to C-24 either had an inappropriate chemical composition or did not satisfy the formula...

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Abstract

The steel material of the present application has the following chemical composition: by mass %, C: 0.05-0.55%, Si: 0.05-1.00%, Mn: 1.51-3.50%, P: 0.1000% or less, S: 0.3000% or less, Cr: 0.05-0.05% 2.50%, V: 0.10-0.75%, Ti: 0.005-0.250%, Al: 0.003-0.100%, N: 0.020% or less and the balance: Fe and impurities, when the C content is 0.05% or more and less than 0.38% Formula (1) is satisfied below, formula (2) is satisfied when the C content is more than 0.38% and less than 0.55%, the coarse Al in the steel 2 o 3 The number density of inclusions is 0.05-1.00 / mm 2 . 0.38≤C+0.11Mn+0.08Cr+0.75V+0.20Mo≤1.50(1) 0.73≤C+0.11Mn+0.08Cr+0.75V+0.20Mo≤1.65(2).

Description

technical field [0001] The present invention relates to steel materials, and more specifically, to steel materials used for hot forging products. Background technique [0002] A connecting rod (hereinafter also referred to as a "connecting rod") used in an automobile engine, etc. is an engine part that connects a piston and a crankshaft, and converts the reciprocating motion of the piston into the rotational motion of the crank. [0003] figure 1 It is a front view of a conventional link. Such as figure 1 As shown, the conventional connecting rod 1 includes a large head portion 100 , a shaft portion 200 , and a small head portion 300 . The large head portion 100 is arranged at one end of the shaft portion 200 , and the small head portion 300 is arranged at the other end of the shaft portion 200 . The big head 100 is attached to the crank pin. The small head 300 is attached to the piston. [0004] The conventional connecting rod 1 has two components (cover 2 and rod 3)....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C22C38/60C21D8/06
CPCC21D8/06C22C38/00C22C38/60
Inventor 宫越有祐高须贺幹
Owner NIPPON STEEL CORP