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Medium-carbon boron-containing non-quenched and tempered steel and preparation method thereof

A non-quenched and tempered steel technology, applied in the field of steelmaking, can solve the problems of poor performance of non-tempered steel, and achieve the effects of grain refinement, enhanced alloy performance, and good serviceability

Active Publication Date: 2021-09-24
CHENGDE JIANLONG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, domestic automobile half-shaft steel is still quenched and tempered steel such as 40Cr, 42CrMo, 40MnBH, and non-tempered steel is still blank in the field of automobile half-shaft steel due to its poor performance.

Method used

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  • Medium-carbon boron-containing non-quenched and tempered steel and preparation method thereof
  • Medium-carbon boron-containing non-quenched and tempered steel and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0045] This embodiment provides a medium-carbon boron-containing non-quenched and tempered steel, and the medium-carbon boron-containing non-quenched and tempered steel includes:

[0046] C 0.4%, Si 0.3%, Mn 1.55%, Cr 0.4%, B 0.002%, Ti 0.03%, P 0.025%, S 0.035%, the balance is Fe and unavoidable impurities.

[0047] Prepare by the following method:

[0048] Described preparation method comprises:

[0049] The blast furnace molten iron is sequentially subjected to converter smelting, LF refining, VD vacuum, continuous casting, heating and rolling to obtain the steel;

[0050] Titanium and boron are added to the VD vacuum for microalloying;

[0051] The heating includes a heating section and a soaking section; the temperature of the heating section is 1180°C; the holding time of the heating section is 120min; the temperature of the soaking section is 1160°C; the holding time of the soaking section Be 110min; The time of described heating is 230min;

[0052] The rolling incl...

Embodiment 2

[0055] This embodiment provides a medium-carbon boron-containing non-quenched and tempered steel, and the medium-carbon boron-containing non-quenched and tempered steel includes:

[0056] C 0.37%, Si 0.17%, Mn 1.4%, Cr 0.2%, B 0.0008%, Ti 0.015%, P 0.005%, S 0.005%, and the balance is Fe and unavoidable impurities.

[0057] Prepare by the following method:

[0058] Described preparation method comprises:

[0059] The blast furnace molten iron is sequentially subjected to converter smelting, LF refining, VD vacuum, continuous casting, heating and rolling to obtain the steel;

[0060] Titanium and boron are added to the VD vacuum for microalloying;

[0061] The heating includes a heating section and a soaking section; the temperature of the heating section is 1140°C; the holding time of the heating section is 160min; the temperature of the soaking section is 1120°C; the holding time of the soaking section is 100min ; The heating time is 260min;

[0062] The rolling includes ...

Embodiment 3

[0065] This embodiment provides a medium-carbon boron-containing non-quenched and tempered steel, and the medium-carbon boron-containing non-quenched and tempered steel includes:

[0066] C 0.42%, Si 0.37%, Mn 1.7%, Cr 0.6%, B 0.0035%, Ti 0.045%, P 0.015%, S 0.015%, and the balance is Fe and unavoidable impurities.

[0067] Prepare by the following method:

[0068] Described preparation method comprises:

[0069] The blast furnace molten iron is sequentially subjected to converter smelting, LF refining, VD vacuum, continuous casting, heating and rolling to obtain the steel;

[0070] Titanium and boron are added to the VD vacuum for microalloying;

[0071] The heating includes a heating section and a soaking section; the temperature of the heating section is 1220°C; the holding time of the heating section is 100min; the temperature of the soaking section is 1200°C; the holding time of the soaking section 100min; the heating time is 200min;

[0072] The rolling includes prel...

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Abstract

The invention relates to medium-carbon boron-containing non-quenched and tempered steel and a preparation method thereof. The medium-carbon boron-containing non-quenched and tempered steel comprises, by mass percent, 0.37-0.42% of C, 0.17-0.37% of Si, 1.4-1.7% of Mn, 0.2-0.6% of Cr, 0.0008-0.0035% of B, 0.015-0.045% of Ti, smaller than or equal to 0.025% of P, smaller than or equal to 0.035% of S and the balance Fe and inevitable impurities. According to the steel provided by the invention, components of the steel are designed, so that the obtained steel for an automobile half axle can be used without hardening and tempering, good use performance can be achieved, the tensile strength of the hot-rolled steel is 760-880 MPa, and the yield strength of the hot-rolled steel is larger than or equal to 460 MPa. Meanwhile, through cooperation with a rolling process, the performance of obtained alloy can be further strengthened, and grains of the steel are remarkably refined.

Description

technical field [0001] The invention relates to the field of steelmaking, in particular to a medium-carbon boron-containing non-quenched and tempered steel and a preparation method thereof. Background technique [0002] At present, with the rapid development of the automobile industry in recent years, green steel non-adjusted steel has been widely used in the automobile field. Non-quenched and tempered steel is a "green" steel that can have the properties of quenched and tempered steel through microalloying, controlled rolling (forging), controlled cooling and other toughening methods without modulation process, which has the advantages of saving time, labor and low cost . The main varieties of non-quenched and tempered steel are: F40MnVS, F45MnVS, 38MnVS6, C70S6 and other varieties, which are widely used in crankshafts, connecting rods, steering knuckles, universal joints and other important auto parts. [0003] The car half shaft is a solid shaft that transmits torque be...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/38C22C38/32C22C38/28C21D8/00C21C7/00C21C7/10
CPCC22C38/02C22C38/04C22C38/38C22C38/32C22C38/28C21D8/005C21C7/0006C21C7/10C21C2007/0018
Inventor 韩常海尹修刚崔红军李诗斌
Owner CHENGDE JIANLONG SPECIAL STEEL