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Novel high-strength, fatigue-resistant and non-decarburized alloy spring steel and preparation method of steel wire thereof

A fatigue-resistant and high-strength technology, applied in the field of high-strength fatigue-resistant non-decarburized alloy spring steel and its steel wire, and alloy spring steel, can solve the problems of reduced spring fatigue life, failure to meet fatigue life requirements, and poor purity.

Inactive Publication Date: 2010-07-28
GUANGZHOU ORSA WIRE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the unreasonable chemical composition design and poor purity of the spring steel used to manufacture oil-quenched and tempered spring steel wire in my country, there are large particle inclusions, and B and D particles larger than 15 μm often appear in the steel. Types of non-deformable hard inclusions, so the fatigue life of the spring is greatly reduced, which cannot meet the fatigue life requirements of high-end cars. Therefore, the oil-quenched and tempered spring steel wires for domestic high-end cars are basically imported from Sweden and Japan, and the domestic spring steel wires are basically used. Used in the manufacture of middle and low-grade domestic automobile springs

Method used

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  • Novel high-strength, fatigue-resistant and non-decarburized alloy spring steel and preparation method of steel wire thereof
  • Novel high-strength, fatigue-resistant and non-decarburized alloy spring steel and preparation method of steel wire thereof
  • Novel high-strength, fatigue-resistant and non-decarburized alloy spring steel and preparation method of steel wire thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Embodiment 1 The preparation method of high-strength fatigue-resistant alloy spring steel without decarburization

[0065] 1. Production process:

[0066] Hot metal pretreatment—converter—external refining—continuous casting of 300×400mm billet—flame cleaning—initial rolling of 160mm billet—flaw detection—peeling—heating—continuous rolling and controlled cooling φ5. 5mm wire rod - take-up - inspection - packaging.

[0067] 2. Preparation steps:

[0068] 1) Carry out pretreatment of molten iron by conventional methods, and then enter the converter for steelmaking;

[0069] 2) Calcium oxide and fluorite are used as slagging agents for converter steelmaking. When the carbon content in molten steel reaches 1.00% to 1.10% and the temperature reaches 1550°C to 1570°C, it is transferred to the VAD refining furnace;

[0070] 3) Use iron sheets to wrap various ferroalloy powders separately, and add Mo-Fe alloy for alloying during the refining and oxidation period outside the ...

Embodiment 2

[0080] Embodiment 2 The preparation method of high-strength fatigue-resistant alloy spring steel without decarburization

[0081] 1. Production process:

[0082] Hot metal pretreatment—converter—external refining—continuous casting of 300×400mm billet—flame cleaning—initial rolling of 160mm billet—flaw detection—peeling—heating—continuous rolling and controlled cooling φ5. 5mm wire rod - take-up - inspection - packaging.

[0083] 2. Preparation steps:

[0084] 1) Carry out pretreatment of molten iron by conventional methods, and then enter the converter for steelmaking;

[0085] 2) Fluorite and calcium oxide are used as slagging agents for converter steelmaking. When the carbon content in molten steel reaches 1.00-1.10% and the temperature reaches 1570°C, it is transferred to the VAD refining furnace;

[0086] 3) Use iron sheets to wrap various iron alloy powders respectively, and add Mo-Fe alloy for alloying during the refining and oxidation period outside the furnace; dur...

Embodiment 3

[0096] Embodiment 3 The preparation method of high-strength fatigue-resistant alloy spring steel wire without decarburization

[0097] Prepare high-strength fatigue-resistant non-decarburization alloy spring steel according to the method substantially the same as Example 1, the difference is only: the ratio of controlling [Nb+V] / [N] is 8.4; according to the content of [S] in the steel The content control [RE] / [S] ratio is 3.5, so that the [RE] content of the final steel reaches 0.07%.

[0098] Get the alloy spring steel of gained, prepare steel wire according to the following method:

[0099] 1. Production process:

[0100]φ5.5mm wire rod pay-off——mechanical shelling—peeling—rewinding and payout—annealing—rewinding and payout—drawing to φ2.0mm—rewinding and payout—gas protection heating—oil quenching ——Tempering——Flaw detection——Take-up——Inspection——Packaging.

[0101] 2. Preparation steps:

[0102] 1) After the φ5.5mm wire rod is paid out, it is mechanically peeled and st...

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Abstract

The invention relates to novel high-strength, fatigue-resistant and non-decarburized alloy spring steel, which comprises the following chemical components by weight percentage: 0.56-0.64 percent of C, 0.80-1.10 percent of Si, 0.80-1.20 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.03 percent of S, 0.80-1.20 percent of Cr, 0.60-1.00 percent of Mo, 0.20-0.30 percent of V, 0.05-0.12 percent of Nb, 0.01-0.06 percent of N, 0.02-0.07 percent of RE, and the balance of Fe. The invention also relates to a preparation method of the alloy spring steel and a steel wire thereof. The surface of the alloy spring steel of the invention has no decarburization, cracking or other defects. Moreover, compared with the prior art, the tensile strength, the fatigue life and other performances of the alloy spring steel are all improved significantly.

Description

technical field [0001] The invention relates to an alloy spring steel, in particular to a high-strength fatigue-resistant non-decarburization alloy spring steel and its steel wire, as well as their preparation method. The alloy spring steel is mainly used for manufacturing high-end automobile oil quenching-tempering valve spring steel wire or suspension spring steel wire, etc., and belongs to the field of new materials for metal products. Background technique [0002] In recent years, my country's automobile industry has developed rapidly. In 2009, the production and sales of automobiles have exceeded 13.6 million, surpassing the United States and ranking first in the world. The annual oil-quenched and tempered alloy spring steel for automobiles exceeds 150,000 tons. The selected steel The grades are basically 60Si2MnA, 55SiCrA, 50CrVA, 67CrVA and other grades. [0003] However, due to the unreasonable chemical composition design and poor purity of the spring steel used to m...

Claims

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Application Information

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IPC IPC(8): C22C38/26C21C7/06C21C7/00B21C37/04
Inventor 陶善龙邢献强
Owner GUANGZHOU ORSA WIRE SCI & TECH
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