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High stress, high plasticity and high hardenability large cross section spring steel

A technology with high hardenability and high plasticity, applied in the field of alloy steel, can solve the problems of short service life of buffer springs, failure to meet the speed-up requirements of trains, unreliable performance and other problems, and achieve stable performance, high hardenability and high fatigue The effect of longevity

Inactive Publication Date: 2010-02-24
常曙光
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of short service life, unreliable performance and inability to meet the speed-up requirements of trains in the prior art of steel types manufacturing medium and heavy-duty engineering vehicle damping springs, train bogies and buffer springs, and provides a High-stress, high-plasticity, high-hardenability steel for large cross-section springs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0020] Embodiment 1-1: 32mm round spring (railway buffer) and 20mm by 90mm flat spring (light vehicle) steel composition:

[0021] C=0.40 Mn=1.45 Cr=0.20 B=0.002 (B is the boron content analyzed with 5N phosphoric acid sulfuric acid solution) Ti=0.04 V=0.08 Si=1.10 S=0.01

[0022] Mo=0.01 W=0.01 Ni=0.01 N=0.008 O=10PPm

[0023] The balance is Fe and impurities, wherein: (Mn+Cr+Mo+W+0.2Ni)=1.67

Embodiment 1-2

[0024] Embodiment 1-2: 32mm round spring (railway buffer) and 20mm by 90mm flat spring (light vehicle) steel composition:

[0025] C=0.37 Mn=1.40 Cr=0.35 B=0.0015 (B is the boron content analyzed with 5N sulfuric acid solution) Ti=0.07 V=0.14 Si=0.8 S=0.01

[0026] Mo=0.01 W=0.01 Ni=0.01 N=0.006 O=20PPm

[0027] The balance is Fe and impurities, wherein: (Mn+Cr+Mo+W+0.2Ni)=1.77

Embodiment 1-3

[0028] Embodiment 1-3: 32mm round spring (railway buffer) and 20mm by 90mm flat spring (light vehicle) steel composition:

[0029] C=0.43 Mn=1.47 Cr=0.18 B=0.004 (B is the boron content analyzed with 5N phosphoric acid sulfuric acid solution) Ti=0.09 V=0.12 Si=1.2 S=0.014 Mo=0.01

[0030] W=0.01 Ni=0.01 N=0.005 O=10PPm

[0031] The balance is Fe and impurities, wherein: (Mn+Cr+Mo+W+0.2Ni)=1.67

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PUM

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Abstract

The invention relates to a large-section spring steel with high stress, high plasticity and high hardenability, which belongs to the alloy steel technical field. The compositions (in weight percent) of the steel are 0.37 to 0.43 percent of carbon, 0.80 to 1.40 percent of silicon, 1.30 to 2.20 percent of manganese, 0.08 to 0.14 percent of vanadium, 0.04 to 0.12 percent of titanium, 0.0015 to 0.004percent of boron, less than 1.00 percent of chromium, less than 0.008 percent of nitrogen, 0.015 percent of sulfur, less than 20 parts per million of oxygen, and the balance being iron and impurities,wherein the gross amount of (Mn+Cr+Mo+w+0.2Ni) alloy is controlled to between 1.60 and 2.60 and B refers to the boron content analyzed by a 5N (equivalent weight) phosphate-sulfate solution sample. The spring steel with high strength and high plasticity can make the fatigue life of a large-section spring flat steel platform reach 0.25 million times under the high stress of 930 MPa and make the fatigue life of a large-section circular spring reach 0.8 million times under the high shear stress of 1,000 MPa. The steel is particularly suitable for manufacturing a damper spring for a moderate andheavy duty technical vehicle, a buffer for a rail vehicle and a spring for a bogie.

Description

(1) Technical field: [0001] The invention belongs to the technical field of alloy steel, and is a high-stress, high-plasticity, high-hardenability steel for large-section springs. (two) background technology: [0002] At present, reducing the weight of the car itself requires reducing the weight of the car springs. Using high-strength, high-toughness spring steel; processing it into variable-section spring flat steel; using one to three pieces of variable-section spring flat steel to form the spring assembly; replacing the multi-piece planar spring flat steel assembly is the current development direction of automobile technology. The running speed of the train is constantly increasing, and the current speed has reached 250-500 kilometers per hour; in order to ensure the safety of high-speed operation, the spring steel used for the bogie and buffer of the train requires a strength of 1800-2300Mpa and an area shrinkage of 45-55%. Above; at present, according to the strength o...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C38/32C22C38/38C22C38/54C22C38/58
Inventor 常曙光
Owner 常曙光