Medium-carbon ferrite-pearlite non-quenched and tempered steel and manufacturing method thereof

A technology of non-quenched and tempered steel and its manufacturing method, which is applied in the field of non-quenched and tempered steel and its manufacturing, can solve the problems of insufficient toughness of carbon ferrite-pearlite type non-quenched and tempered steel, and achieve good processing performance and economical efficiency Effect

Active Publication Date: 2013-08-28
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a medium carbon ferrite-pearlite non-quenched and tempered steel in order to overcome the technical problem of insufficient toughness of the medium carbon ferrite-pearlite type non-quenched and tempered steel in the prior art. Ferrite-pearlite non-quenched and tempered steel has the characteristics of high strength and high toughness at the same time. Without quenching and tempering heat treatment, the strong plasticity index of hot-rolled steel can reach the level of 40Cr or 40MnB quenched and tempered steel

Method used

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  • Medium-carbon ferrite-pearlite non-quenched and tempered steel and manufacturing method thereof
  • Medium-carbon ferrite-pearlite non-quenched and tempered steel and manufacturing method thereof
  • Medium-carbon ferrite-pearlite non-quenched and tempered steel and manufacturing method thereof

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with embodiment.

[0029] Table 3 shows the composition weight percentage of the medium carbon ferrite-pearlite non-quenched and tempered steel made in Examples 1 to 3 of the present invention; Mechanical properties of carbon-ferritic-pearlitic non-quenched and tempered steels. The test methods for the experimental data in Tables 3 and 4 all adopt international common methods.

[0030] Wherein, the weight percentages of the elements of the medium-carbon ferrite-pearlite non-quenched and tempered steel produced in Examples 1 to 3 of the present invention all fall within the following ranges:

[0031] C: 0.35-0.43% Si: 0.30-0.80%

[0032] Mn: 1.00-1.60% Cr: 0.10-0.30%

[0033] V: 0.06~0.20% Ni: 0.10~0.30%

[0034] P≤0.035% S: 0.040~0.075%

[0035] al t : 0.010~0.060% N: 100~200×10 －4 %

[0036] The remainder is Fe and unavoidable impurities.

[0037] Due to the reduction of C content in medium-c...

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Abstract

The invention relates to a medium-carbon ferrite-pearlite non-quenched and tempered steel which comprises the following components in percentage by weight: 0.35-0.43% of C, 0.30-0.80% of Si, 1.00-1.60% of Mn, 0.10-0.30% of Cr, 0.06-0.20% of V, 0.10-0.30% of Ni, at most 0.035% of P, 0.040-0.075% of S, 0.010-0.060% of Alt, 100-200*10<-4>% of N, and the balance of Fe and inevitable impurities. The medium-carbon ferrite-pearlite non-quenched and tempered steel has the characteristics of high strength and high toughness, and the plasticity of the hot rolled steel can still achieve the level of 40Cr or 40MnB quenched and tempered steel under the condition of no quenching and tempering treatment. The invention also relates to a manufacturing method of the medium-carbon ferrite-pearlite non-quenched and tempered steel.

Description

technical field [0001] The invention relates to the technical field of non-quenched and tempered steel and its manufacture, in particular to a medium-carbon ferrite-pearlite type non-quenched and tempered steel and its manufacturing method. Background technique [0002] Medium-carbon ferrite-pearlite non-quenched and tempered steel, the strength of the steel can be improved by adding microalloying elements such as V, and increasing the amount of pearlite and precipitation strengthening such as vanadium carbide. Its strength can fully reach 900-1000MPa of quenched and tempered steel level of strength. However, since the structure is ferrite-pearlite, its toughness is generally lower than that of tempered sorbite in quenched and tempered steel, and the precipitation strengthening of coherent precipitates further reduces the toughness of steel, making non-tempered steel The use of high-quality steel in shock-loaded components is limited. Contents of the invention [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C21C7/00B22D11/00B21B37/74
CPCY02P10/20
Inventor 戈文英翟正龙张海霞梁娜徐峰张君平
Owner LAIWU IRON & STEEL GRP
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