JPH06330241A - Wear resistant steel and piston ring material of internal combustion engine or liner material - Google Patents

Abstract

PURPOSE:To produce wear resistant steel high in strength, elongation and toughness and furthermore good in workability by incorporating wear resistant steel with specified wt.% of carbon, silicon manganese, phosphorus, sulfur and chromium. CONSTITUTION:The componental compsn. of this wear resistant steel is constituted of, by weight, 1.2% carbon, <=0.8% silicon, >=0.2% manganese, <=0.2% phosphorus, >=0.1% sulfur, <=6.0% chromium and <=0.5% other components, and the balance substantial iron. Or, the content of chromium is regulated to <=15.0%. This steel is used for a piston material or a liner material, As the heat treatment of this material, e.g. hardening (at 780 to 840 deg.C) oil quenching tempering (at 100 to 600 deg.C) air cooling are executed. In this way, the wear resistant steel excellent in wear resistance and scuffing resistance can be provided.

Description

Detailed Description of the Invention

[0001]

This invention relates to wear resistant steel and piston ring or liner materials for internal combustion engines, and more particularly to
A wear-resistant steel with excellent wear resistance and scuff resistance,
High-strength wear resistant steel with higher strength and elongation than cast iron, higher toughness than super-strength steel and cemented carbide, and good workability, and piston ring material or liner material for internal combustion engine .

[0002]

2. Description of the Related Art A piston ring of an internal combustion engine such as a Diedel engine is required to have characteristics such as wear resistance and scuff resistance. Conventionally, as wear-resistant alloys used for such applications, cast iron such as Uvalloy, super-strong steel having high hardness, and cemented carbide are known.

[0003]

However, cast iron has the drawbacks of low strength and low elongation, and super-strength steel and cemented carbide have low toughness, poor workability, and scuff resistance ( It also has the drawback of being poor in seizure resistance).

The present invention solves the above-mentioned conventional problems and is a wear resistant steel having excellent wear resistance and scuffing resistance, which is higher in strength and elongation than cast iron and is super-strong steel. An object of the present invention is to provide a high-performance wear-resistant steel which has higher toughness and better workability than cemented carbide and a piston ring material or liner material for an internal combustion engine.

[0005]

The wear resistant steel according to claim 1 is carbon: 1.2% by weight or less, silicon: 0.8% by weight or less, manganese: 0.2% by weight or more, phosphorus: 0.2% by weight. Sulfur: 0.1% by weight or more Chromium: 6.0% by weight or less Other components: 0.5% by weight or less, and the balance is substantially Fe.

The wear-resistant steel according to claim 2 is carbon: 1.2% by weight or less, silicon: 0.8% by weight or less, manganese: 0.2% by weight or more, phosphorus: 0.2% by weight or less, sulfur: 0.1 % By weight or more Chromium: 15.0% by weight or less Other components: 0.5% by weight or less, the balance being substantially Fe.

A piston ring material or a liner material for an internal combustion engine according to claim 3 is made of the wear resistant steel according to claim 1.

A piston ring material or a liner material for an internal combustion engine according to claim 4 is made of the wear resistant steel according to claim 2.

The present invention will be described in detail below.

The wear resistant steel and the piston ring material or liner material of the internal combustion engine of the present invention have the compositions shown in Table 1 below, preferably Table 2 below.

[0011]

[Table 1]

[0012]

[Table 2]

The wear resistant steel of the present invention and the piston ring material or liner material for an internal combustion engine are generally subjected to the following ordinary heat treatment before use. In addition to such heat treatment, laser heat treatment or sub-zero treatment may be performed.

Heat treatment method and conditions Abrasion resistant steel according to claim 1: quenching (temperature: 780 to 840)
C) → quenching in oil → tempering (temperature: 100-600 ° C.) → cooling the wear-resistant steel of claim 2: quenching (temperature: 1000-110)
0 ℃) → quenching in oil → tempering (temperature: 200-600 ℃) →
Cooling

[0015]

The action of the wear resistant steel of the specific composition of the present invention is
In addition to excellent scuff resistance, it has higher strength than cast iron,
The growth is large. Further, it has higher toughness and better workability than super-strength steel and cemented carbide.

The wear resistant steel of the present invention as described above is industrially very useful as a piston ring material, a liner material, etc. of an internal combustion engine.

[0017]

EXAMPLES The present invention will be described in more detail with reference to the following examples. In addition, in the following examples, as an example of the wear resistant steel of claim 1, a wear resistant steel having the following composition I,
As an example of the wear resistant steel of claim 2, wear resistant steel having the following composition II was used. As a comparative example, Uvalloy and Uvalloy plated with chromium (hereinafter simply referred to as "Cr plating") were used.

[0018]

[Table 3]

The wear resistant steels of compositions I and II according to the present invention were subjected to the following heat treatment.

Heat Treatment Method and Condition Composition I: Quenching (810 ° C.) → quenching in oil → tempering (400
℃) → Air cooling Composition II: Quenching (1050 ℃) → Quenching in oil → Tempering (400
C.) → Air cooling Example 1 A wear test was carried out by sliding friction under the following conditions using a turquoise disc and pins composed of Uvalloy, wear resistant steel of composition I and wear resistant steel of composition II, respectively. , Results (amount of wear per 100 hours of wear test)
Is shown in FIG.

Abrasion test conditions Friction speed: 1.65 m / sec Contact load: 4500 N Lubricating oil: SAE # 20 engine oil Lubricating oil speed: 160 ° C. From FIG. 1, the wear resistant steel of the present invention is excellent in wear resistance. Is clear.

Example 2 A pin disk type friction wear was carried out using a rotating piece made of super turquoise and a fixed piece made of Uvalloy, Cr plating, wear resistant steel of composition I and wear resistant steel of composition II. Perform a scuff test under the following conditions with a test machine,
The time until the scuffing and the load were examined, and the results are shown in FIG.

Scuff test conditions Lubricating oil: SAE # 30 + white kerosene (1: 1) Lubricating oil amount: Lubricating oil was applied to the sliding surface of the rotating piece, and the peripheral speed was 5 m /
The amount of oil on the sliding surface was kept constant by spinning idly for 30 seconds. Test method: The test was carried out according to the load, peripheral speed, and time step of FIG. Lubricating oil: SAE # 30 + white kerosene (1: 1) Lubricant amount: The same as. Test method: The test was performed according to the load, peripheral speed, and time step of FIG. From FIG. 2, it is clear that the wear resistant steel of the present invention is extremely excellent in scuff resistance. The results of measurement of various properties of the wear resistant steels having compositions I and II are shown in Table 4, which has higher strength and elongation than cast iron.
It was confirmed that the toughness was higher and the workability was superior to that of super-strength steel and cemented carbide. Particularly with regard to workability, a predetermined amount of P. Excellent machinability due to the inclusion of S.

[0024]

[Table 4]

[0025]

As described above in detail, according to the wear resistant steel of the present invention, the wear resistant steel is excellent in wear resistance and scuff resistance, and has higher strength and larger elongation than cast iron. In addition, a high-characteristic wear-resistant steel having higher toughness and better workability than super-strength steel and cemented carbide is provided. Such wear resistant steel of the present invention is extremely useful as a piston ring material or a liner material of an internal combustion engine.

[Brief description of drawings]

FIG. 1 is a graph showing the results of Example 1.

FIG. 2 is a graph showing the results of Example 2.

Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical indication location F16J 9/26 B 10/04 (72) Inventor Hajime Okamoto 3-1-1 Tamata, Tamano-shi, Okayama Mitsui Engineering & Shipbuilding Tamano Works Co., Ltd. (72) Inventor Hiroshi Ono 3-1-1 Tam, Tamano City, Okayama Prefecture Mitsui Engineering & Ships Co., Ltd. Tamano Works Co., Ltd.

Claims (4)

[Claims] 1. Carbon: 1.2 wt% or less Silicon: 0.8 wt% or less Manganese: 0.2 wt% or more Phosphorus: 0.2 wt% or less Sulfur: 0.1 wt% or more Chromium: 6.0 Weight% or less Other components: 0.5% by weight or less, and the balance being substantially iron, which is wear-resistant steel. 2. Carbon: 1.2 wt% or less Silicon: 0.8 wt% or less Manganese: 0.2 wt% or more Phosphorus: 0.2 wt% or less Sulfur: 0.1 wt% or more Chromium: 15.0 Weight% or less Other components: 0.5% by weight or less, and the balance being substantially iron, which is wear-resistant steel. 3. A piston ring material or liner material for an internal combustion engine, which is made of the wear-resistant steel according to claim 1. 4. A piston ring material or liner material for an internal combustion engine, which is made of the wear resistant steel according to claim 2.