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55Si2MnVNbN spring steel and production process thereof

A production process and technology of spring steel, which is applied in the field of metallurgy, can solve the problems of easy decarburization, coarse grains, poor hardenability, etc., and achieve high tensile strength, high life, and excellent resistance to delayed fracture.

Inactive Publication Date: 2012-08-22
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

60Si2MnA has good anti-elasticity due to its high carbon content, silicon content, and manganese content, but it is easy to decarburize, carbon segregation, overheating sensitivity, coarse grains, and relatively poor hardenability

Method used

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  • 55Si2MnVNbN spring steel and production process thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The present embodiment is 55Si2MnVNbN spring steel, and comparative example is 60Si2MnA spring steel, and composition is as shown in the table below:

[0024] Table 1

[0025]

C

mn

Si

P

S

Cr

Nb

Cu

V

N

Fe

Example

0.55

0.70

1.80

0.015

0.006

0.25

0.020

0.07

0.10

0.012

margin

comparative example

0.60

0.85

1.80

0.020

0.008

0.003

0.002

0.07

0.01

0.005

margin

[0026] The specific process is as follows:

[0027] Electric furnace smelting:

[0028] It is required to tap steel without slag in red envelopes. The first three furnaces of the newly built furnace shell of the electric furnace shall not be used to produce the spring steel in this plan, and the use of new ladles shall be avoided as much as possible. For the 100-ton electric furnace smelting, due to the nee...

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Abstract

The invention relates to spring steel and a production process thereof, in particular to 55Si2MnVNbN spring steel and a production process thereof. The 55Si2MnVNbN spring steel comprises the following components in percentage by weight: 0.52 to 0.60 percent of C, 1.60 to 1.90 percent of Si, 0.60 to 0.80 percent of Mn, 0.15 to 0.35 percent of Cr, 0.06 to 0.12 percent of V, 0.015 to 0.025 percent of Nb, 0.80 to 1.50 percent of N, less than or equal to 0.0035 of P, less than or equal to 0.0035 percent of S and the balance of Fe and inevitable impurities. The process comprises electric furnace electrosmelting, LF refining, VD furnace vacuum degassing, continuous casting and rolling. The spring steel can meet the requirements of springs on various severe working environments, high strength andlong service life and has high tensile strength, high delayed fracture resistance, high corrosion resistance, high fatigue resistance and high elasticity attenuation resistance.

Description

technical field [0001] The invention belongs to the field of metallurgy and relates to a spring steel and a production process thereof, in particular to a 55Si2MnVNbN spring steel and a production process thereof. Background technique [0002] 60Si2MnA is one of the most widely used spring steel varieties in China, and its consumption accounts for about 70% of the total spring steel. It is mainly used for leaf springs and coil springs on automobiles, tractors, and railway vehicles. Along with the process of automobile lightweight, energy saving and railway speed increasing, it is required to continuously develop high-quality high-strength spring steel varieties with high strength, energy saving, corrosion resistance, hydrogen resistance to cracks. 60Si2MnA steel has high strength, good anti-shock resistance and relatively cheap price. 60Si2MnA has good anti-shock resistance due to its high carbon content, silicon content, and manganese content, but it is easy to decarburize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/34C21D7/06C21D7/10B21B1/46B21B37/74
Inventor 王时林沈朴恒王德炯程维玮
Owner NANJING IRON & STEEL CO LTD
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