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High-strength tough non-quenched and tempered steel suitable for compound forge forming

A non-quenched and tempered steel, forging forming technology, applied in the field of non-quenched and tempered steel for composite forging and high-strength toughness non-quenched and tempered steel, can solve the problems of forging forming difficulties, reduce the yield of finished products, and die wear, and achieve superior mechanical properties , The effect of shortening the process flow

Active Publication Date: 2015-05-06
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when some high-strength medium- and high-carbon non-quenched and tempered steels are forged at the recrystallization temperature, due to the low deformation temperature, forging and forming are difficult, micro-crack defects are easily formed inside the material, and the yield is reduced. Very severe wear on the mold

Method used

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  • High-strength tough non-quenched and tempered steel suitable for compound forge forming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] The present invention will be specifically introduced below in conjunction with specific embodiments.

[0026] The present invention provides five examples in total, and the detailed chemical composition and mass percentage of each example are shown in Table 1.

[0027] serial number

C

mn

Si

Al

V

N

Nb

RE

P

S

Ti

W

Mo

Example 1

0.28

1.81

0.45

0.077

0.071

0.018

0.033

0.0017

0.011

0.0020

-

-

-

Example 2

0.38

1.04

0.78

0.090

0.019

0.011

0.012

0.0034

0.006

0.0014

-

-

-

Example 3

0.33

1.42

0.53

0.038

0.021

0.013

0.008

0.0066

0.017

0.0019

0.13

-

-

Example 4

0.36

1.27

0.59

0.043

0.034

0.015

0.037

0.0051

0.022

0.0034

0.089

0.044

-

Example 5

0.30

1.70

0.34

0.065

0...

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Abstract

The invention discloses high-strength tough non-quenched and tempered steel suitable for compound forge forming. By means of a microalloying effect, the recrystalization temperature of non-quenched and tempered steel is increased, so that the steel is suitable for compound forge forming (hot forging+warm forging) and the strength and toughness of the non-quenched and tempered steel are improved. For the non-quenched and tempered steel after compound forge forming, the tensile strength of a forge Rm is greater than or equal to 900MPa, the yield strength Rp0.2 is greater than or equal to 750MPa, the yield ratio is greater than or equal to 0.85, the ductility A is greater than or equal to 17%, and the percentage reduction of area Z is greater than or equal to 50%. The forge can satisfy the performance requirement of high impact load, has the mechanical property which is comparable to quenched and tempered steel with same use and meanwhile has the advantages of shortening the process flow, saving the energy and lowering the cost.

Description

technical field [0001] The invention relates to a non-quenched and tempered steel for compound forging (hot forging + warm forging), in particular to a high-strength toughness non-quenched and tempered steel suitable for forging at a recrystallization temperature, and belongs to the field of materials. Background technique [0002] Non-quenched and tempered steel forging is a new energy-saving, environmental-friendly and cost-reducing process that uses micro-alloyed, controlled rolling and controlled cooling raw materials, and combines forging and heat treatment. However, compared with quenched and tempered steel forgings, non-quenched and tempered steel forgings have more strength but insufficient toughness. At present, non-quenched and tempered steel forgings are only commonly used in automobiles and a small number of construction machinery industries, such as automotive engine connecting rods, crankshafts, and universal joints. Festival fork and so on. The low toughness ...

Claims

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Application Information

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IPC IPC(8): C22C38/12
CPCC22C38/001C22C38/005C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 王章忠毛向阳张保森朱帅帅陶学伟巴志新
Owner NANJING INST OF TECH
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