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Stainless steel for valve spring and preparation method of steel wire thereof

A valve spring and stainless steel wire technology, which is applied in the fields of stainless steel and its preparation, spring steel and its preparation, and austenitic stainless steel wire, can solve the problem of high alloy cost and achieve the effects of low alloy cost, excellent fatigue performance and good corrosion resistance.

Active Publication Date: 2021-11-05
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Higher alloy cost due to higher Mo content

Method used

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  • Stainless steel for valve spring and preparation method of steel wire thereof
  • Stainless steel for valve spring and preparation method of steel wire thereof
  • Stainless steel for valve spring and preparation method of steel wire thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In this embodiment, the chemical composition of a valve spring stainless steel is shown in Table 1.

[0040] In this example, see figure 1 And table 2, a kind of preparation method of valve spring stainless steel wire, comprises the steps:

[0041] a. melting and casting process: the valve spring of the present embodiment is smelted into molten steel with stainless steel, and then the molten steel is continuously casted into a round billet;

[0042] b. Hot rolling process: Peel the round billet prepared in the step a, then heat the round billet to 1150°C, and obtain a hot-rolled wire rod after hot rolling, and the heating time is 160min;

[0043] c. Solution heat treatment: performing solution heat treatment on the hot-rolled wire rod prepared in the step b, controlling the solution heat treatment temperature to be 1000° C., and the heating time to be at least 60 minutes;

[0044] d. Intermediate treatment process: pickling, phosphating, and saponifying the wire rod a...

Embodiment 2

[0048] This embodiment is basically the same as Embodiment 1, and the special features are:

[0049] In this embodiment, the chemical composition of a valve spring stainless steel is shown in Table 1.

[0050] In this embodiment, referring to Table 2, a method for preparing a stainless steel wire for a valve spring comprises the following steps:

[0051] a. melting and casting process: the valve spring of the present embodiment is smelted into molten steel with stainless steel, and then the molten steel is continuously casted into a round billet;

[0052] b. Hot rolling process: Peel the round billet prepared in the step a, then heat the round billet to 1180°C, and obtain a hot-rolled wire rod after hot rolling, and the heating time is 100 minutes;

[0053] c. Solution heat treatment: performing solution heat treatment on the hot-rolled wire rod prepared in the step b, controlling the solution heat treatment temperature to be 1050° C., and the heating time to be at least 50 m...

Embodiment 3

[0058] This embodiment is basically the same as the previous embodiment, and the special features are:

[0059] In this embodiment, the chemical composition of a valve spring stainless steel is shown in Table 1.

[0060] In this embodiment, referring to Table 2, a method for preparing a stainless steel wire for a valve spring comprises the following steps:

[0061] a. melting and casting process: the valve spring of the present embodiment is smelted into molten steel with stainless steel, and then the molten steel is continuously casted into a round billet;

[0062] b. Hot rolling process: Peel the round billet prepared in the step a, then heat the round billet to 1160°C, and obtain a hot-rolled wire rod after hot rolling, and the heating time is 140min;

[0063] c. Solution heat treatment: performing solution heat treatment on the hot-rolled wire rod prepared in the step b, controlling the solution heat treatment temperature to be 1020° C., and the heating time to be at leas...

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Abstract

The invention discloses a stainless steel for valve spring, the mass percent of its chemical composition is: C: 0.05-0.12%, Si: 0.15-0.45%, Mn: 11-14%, Cr: 17-19%, Ni: 0.5% ~1.5%, Cu: 1.0~2.0%, N: 0.2~0.4%, Ce: 0.01~0.05%; the balance is Fe and unavoidable impurities. The manufacturing method of the steel wire for the valve spring of the present invention comprises: smelting, continuous casting into a round billet; rolling into a hot-rolled wire rod and performing solution treatment, the solution temperature is 1000-1060°C; performing multiple passes according to the diameter of the wire rod For drawing, the diameter reduction rate of each pass is controlled between 6% and 15%; then stress relief annealing is carried out, the heating temperature is 400-450°C, and the heat preservation is 2‑3h. The tensile strength of the stainless spring steel wire of the invention is greater than 1710 MPa, and the microstructure is austenite deformation twins.

Description

technical field [0001] The invention relates to a stainless steel and a preparation method, in particular to an austenitic stainless steel wire rod, spring steel and a preparation method, which are applied in the technical fields of spring steel materials and heat treatment. Background technique [0002] Due to its excellent comprehensive mechanical properties and good corrosion resistance, stainless steel has gradually increased its share in the spring industry. Stainless steel spring wire mainly has austenitic type and precipitation hardening type. Austenitic stainless steels are often work-hardened by cold drawing to produce high-strength springs. The tensile strength of steel wire increases with the increase of cold drawing deformation. The cold drawing process of metastable austenitic stainless steel wire mainly involves three deformation modes: dislocation slip, twinning and phase transformation. Under the condition of large deformation, the structure along the draw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/42C22C38/58B21C37/04C21D8/06C22C33/04
CPCB21C37/047C21D8/065C21D2211/001C22C33/04C22C38/001C22C38/005C22C38/02C22C38/42C22C38/58
Inventor 田青超孙京飞
Owner SHANGHAI UNIV
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