Carbon-manganese composite microalloyed steel for engineering machinery and preparation method thereof

A technology of construction machinery and micro-alloying, applied in the direction of temperature control, furnace type, furnace, etc., to reduce center porosity and segregation, stabilize hardenability, and increase equiaxed crystals of billets

Inactive Publication Date: 2010-02-24
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention mainly aims at the determination of the optimal boron content, the control of effective boron and the application of trace Cr element in the smelting process of carbon-manganese series construction machinery steel in boron microalloying, and provides a carbon-manganese series boron-titan

Method used

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  • Carbon-manganese composite microalloyed steel for engineering machinery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: 15B36Cr steel

[0039] 1. The weight percent of the chemical composition of the steel is: C0.37 Si0.22 Mn1.25 P0.014 S0.009 B0.0014 Al0.025Ti0.03Ti / N=3.5; the balance is Fe and trace impurities.

[0040] 2. The process route is:

[0041] Batching→electric furnace smelting→tapping from eccentric furnace bottom→deoxidation and alloying in LF furnace→adding iron boron to adjust boron composition→vacuum refining furnace degassing→full protection casting of billet continuous casting machine→rolled product specification Φ70mm→inspection and storage.

[0042] 3. The main process measures of the preparation method

[0043] (1) The proportion of molten iron in the furnace steel material structure reaches 40-60%; no high-phosphorus and sulfur scrap steel such as slag steel and tank side iron are added to the batching.

[0044] (2) The smelting process creates good foam slag, uniform decarburization, and reduces nitrogen absorption.

[0045] (3) The goal of the melti...

Embodiment 2

[0053] Example 2: 15B36Cr steel

[0054] 1. The weight percent of the chemical composition of steel is: C0.35 Si0.20 Mn1.35 P0.016 S0.001 B0.0029 Cr0.20Al0.023 Ti0.05 Ti / N=5; the balance is Fe and trace impurities .

Embodiment 3

[0055] Example 3: 15B36Cr steel

[0056] The chemical composition weight percent of the steel is: C0.33 Si0.23 Mn1.35 P0.012 S0.005 B0.0016 Al0.035Ti0.03 Ti / N=4; the balance is Fe and trace impurities.

[0057] The preparation method is the same as in Example 1.

[0058] The furnace numbers of Example 1, Example 2, and Example 3 are T208-4899, T208-4904, and T208-4912 respectively, and the mechanical properties and end hardenability of the rolled materials are shown in Table 1 and Table 2 below.

[0059] Table 1 Mechanical properties of rolled products

[0060] furnace number

Rm(MPa)

tensile strength

ReL(MPa)

Yield Strength

A(%)

Elongation

Z(%)

Shrinkage

Aku(J)

Impact energy

T208-4899

1075 / 1070

940 / 930

16 / 15

52 / 53

110 / 115

T208-4904

1060 / 1065

965 / 965

14 / 15

53 / 52

112 / 97

T208-4912

1055 / 1045 ...

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Abstract

The invention relates to a carbon-manganese composite microalloyed steel for engineering machinery and a preparation method thereof. The steel comprises the following chemical compositions by weight percent: 0.32-0.37% of C, 0.15-0.30% of Si, 1.20-1.40% of Mn, 0.030% or less of P, 0.030% or less of S, 0.0005-0.0030% of B, 0.10-0.60% of Cr, 0.01-0.07% of Al and the balance Fe and trace impurities,wherein the content of available boron in the steel is not less than 95%. The invention also provides a preparation method of the composite microalloyed steel and the method controls the ratio of Ti to N to be 3-6 and the acid soluble aluminium content to be 0.030-0.050% so as to ensure that boron in the steel is almost available boron. The preparation method of the invention controls the contentof trace element boron and ensures the hardenability of steel so that the steel is suitable to be used for the preparation of important mechanical parts.

Description

technical field [0001] The invention relates to the smelting technology of alloy structural steel, in particular to a carbon-manganese-based boron-titanium composite microalloyed steel for construction machinery and a preparation method thereof Background technique [0002] Bulldozer track chain rail joints, wheel body and other parts not only bear the full weight of the whole machine, but also bear the wear and impact of sand and mud, etc., and the service conditions are harsh. Therefore, the steel used is generally required to have high strength and toughness. And good welding performance, formability, etc. [0003] Since a small amount of boron can significantly improve the hardenability of steel, which can save a lot of precious alloying elements (Cr, Mo, etc.), the use of boron steel is more economical and reasonable, and the carbon equivalent Ceq and welding crack sensitivity coefficient are greatly reduced. And boron steel is suitable for water quenching and can be q...

Claims

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Application Information

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IPC IPC(8): C22C38/32C21C7/10C21C7/072C21C5/52C21C7/06C21D8/00B22D11/16B21B37/74
Inventor 张伟翟正龙郑桂芸李猛戈文英窦圣鹏王学利张春苗孙永喜张海霞
Owner SHANDONG IRON & STEEL CO LTD
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