Steel for fracture split connecting rods

A cracking connecting rod, quality technology, applied in the steel field of connecting rod"), can solve problems such as poor machinability

Inactive Publication Date: 2010-11-10
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in Patent Documents 2 and 3, Ti exceeds 0.10% in Examples, and the machinability is poor.

Method used

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  • Steel for fracture split connecting rods
  • Steel for fracture split connecting rods
  • Steel for fracture split connecting rods

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0074] The steel with the chemical composition shown in Table 1 was melted according to the usual smelting method, after casting and slabbing, rolling was carried out at a starting temperature of 1050°C and an ending temperature of 900°C to obtain bar steel.

[0075] The properties of the obtained bar steel were investigated as follows.

[0076] (1) Sulfide-based inclusions

[0077] In the longitudinal section at the position D / 4 (D is the diameter) from the surface of the bar steel, observe with an optical microscope (1000 times) 1mm 2 In the field of view, count the number of sulfide-based inclusions with a width of 1 μm or more. In addition, the aspect ratio of the sulfide-based inclusions having a width of 1 μm or more was measured, and the arithmetic mean thereof was obtained.

[0078] (2) Disintegration (dimension change)

[0079] The rods obtained in the experimental example were cut into appropriate lengths, heated to a temperature of 1200° C., flat-pressed to a t...

experiment example 2

[0097] Except using the steel of the chemical composition shown in Table 2, 3, it was the same as Experimental Example 2. Regarding the tool life, in each of the groups B to H and J, the tool life of the steel type to which no Ti was added was set as 1, and the tool life was expressed as a relative value at this time.

[0098] The results are shown in Tables 4-7. In addition, in Table 7, the tool life of steel type A1 when the tool life of steel type J1 is taken as 1 is also shown together, so that it can be compared with the tool life of group A which contains a large amount of V at about 0.160%. .

[0099] [Table 2]

[0100]

[0101] ※Al: less than 0.01% is an unavoidable amount, marked as "-"

[0102] [table 3]

[0103]

[0104] ※Al: less than 0.01% is an unavoidable amount, marked as "-"

[0105] [Table 4]

[0106]

[0107] [table 5]

[0108]

[0109] [Table 6]

[0110]

[0111] [Table 7]

[0112]

[0113] The size after cracking of steel types B...

experiment example 3

[0115] The steel type H2 shown in Table 2 was used, and the rolling start temperature and the rolling end temperature were as shown in Table 8 below, except that it was the same as Experimental Example 1.

[0116] The results are shown in Table 8

[0117] [Table 8]

[0118]

[0119] As can be seen from Table 8, the higher the rolling start temperature and the rolling finish temperature, the smaller the aspect ratio of the sulfide-based inclusions.

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Abstract

A steel for fracture split connecting rods, characterized by containing by mass C: 0.25 to 0.5%, Si: 0.01 to 2.0%, Mn: 0.50 to 2.0%, P: 0.015 to 0.080, S: 0.01 to 0.2%, V: 0.02 to 0.20%, Cr: 0.05 to 1.0%, Ti: 0.01 to 0.10% and N: 0.01% or below and having an f value of 0.003 to 0.04 as defined by the following formula and an average aspect ratio of sulfide inclusions of 15 or below: f = [Ti]-[N]x48 / 14 wherein [Ti] and [N] are contents (mass%) in steel of Ti and N respectively.

Description

technical field [0001] The present invention relates to steel suitable for use in the manufacture of connecting rods (hereinafter simply referred to as "con rods") used as parts of automobile engines and the like. Background technique [0002] In an internal combustion engine such as a gasoline engine or a diesel engine, a connecting rod is used as a member that connects a piston and a crankshaft and transmits the reciprocating motion of the piston to the crankshaft to convert it into rotational motion. The connecting rod has a substantially circular through-hole for assembly to the crankshaft, and the through-hole portion is separated (divided) into two substantially semicircular parts in order to facilitate assembly and disassembly during maintenance. The side of the separated connecting rod that is directly connected to the piston is called the connecting rod body, and the rest is called the connecting rod cover. [0003] Such a connecting rod can be manufactured by, for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/38C22C38/58
CPCC22C38/02C22C38/28C22C38/04C22C38/24C22C38/38C22C38/002C22C38/008
Inventor 松迫亮广阿南吾郎椎桥庆太
Owner KOBE STEEL LTD
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