A method for preparing boron-containing microalloy steel by using boron-containing pig iron as a boron-adding agent

A technology of microalloyed steel and boron pig iron, applied in the field of metallurgy, can solve the problem of low boron yield and other problems, and achieve the effects of good application prospect, low comprehensive cost and excellent product performance.

CN103741025BActive Publication Date: 2015-08-12NORTHEASTERN UNIV LIAONING
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-08-12
Patent Text Reader

Abstract

The invention provides a method for preparing boron-containing micro-alloy steel by using boron-containing pig iron as a boron charging agent, and belongs to the technical field of metallurgy. The method comprises the following steps: (1) preparing industrial pure iron, the boron-containing pig iron, ferro-titanium, manganese metal, iron-carbon alloy, ferro-silicon alloy and pure aluminium serving as raw materials according to predetermined components; (2) adding the prepared industrial pure iron and iron-carbon alloy to an induction furnace, melting the materials, sequentially adding the ferro-silicon alloy, the pure aluminium, the ferro-titanium, the manganese metal and the boron-containing pig iron, melting under a vacuum condition, and feeding argon for refinement; (3) after ending refinement, casting into cast ingots, then heating to 1200+ / -10 DEG C, and preserving heat for 0.5-2 hours; (4) rolling the cast ingots subjected to heat preservation by two stages; and carrying out final rolling, thus obtaining roll steel; and (5) continuously cooling the roll steel to 530-560 DEG C at the rate of 40-50 DEG C / s, and then carrying out air cooling to room temperature, thus obtaining the boron-containing micro-alloy steel. The method has the advantages that the composite cost is low, the industrialization is easy to realize, and the prepared product has excellent performances and good application prospect.
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Description

technical field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing boron-containing microalloy steel by using boron-containing pig iron as a boron-adding agent. Background technique

[0002] The boron-containing pig iron obtained by using the blast furnace iron-boron separation process has the characteristics of convenient source, cheap price, and stable performance. It is mainly used as a boron additive for the production of wear-resistant cast iron. In order to make more reasonable use of limited boron resources, boron-rich slag is mainly extracted from boron iron ore, while the remaining boron-containing pig iron can be used in other aspects.

[0003] Using boron-containing pig iron to directly smelt boron steel is a research topic with practical significance and rational utilization of boron ore resources. The boron steel smelted directly with boron-containing pig iron as raw material does not have high...

Examples

Embodiment 1

[0029] Prepare industrial pure iron, boron-containing pig iron, ferro-titanium alloy, manganese metal, iron-carbon alloy, ferrosilicon alloy and pure aluminum as raw materials according to the set composition;

[0030] The composition of boron-containing pig iron contains C 3.1%, Si 2.2%, Mn 0.08%, P 0.05%, S 0.10%, B 0.85% by weight percentage, and the balance is Fe;

[0031] The composition of titanium-iron alloy contains C 0.25%, Si 0.43%, V 2.8%, P 0.03%, S 0.03%, Al 4.5%, Ti 69.0% by weight percentage, and the balance is Fe;

[0032] The composition of metal manganese contains C 0.072%, Si 0.30%, P 0.02%, S 0.03%, Fe 1.8%, and the balance is Mn by weight percentage;

[0033] The composition of the iron-carbon alloy contains 3.10% C by weight percentage, and the balance is Fe and unavoidable impurities;

[0034] The composition of ferrosilicon alloy contains Si 76%, C 0.15%, P 0.035%, S0.016%, Al 1.8% by weight percentage, and the balance is Fe;

[0035] Put the industri...

Embodiment 2

[0040] Prepare industrial pure iron, boron-containing pig iron, ferro-titanium alloy, manganese metal, iron-carbon alloy, ferrosilicon alloy and pure aluminum as raw materials according to the set composition;

[0041] Among them, the composition of boron-containing pig iron contains C 3.4%, Si 2.3%, Mn 0.10%, P 0.05%, S 0.09%, B 0.72% by weight percentage, and the balance is Fe;

[0042] The composition of titanium-iron alloy contains C 0.30%, Si 0.44%, V 2.9%, P 0.02%, S 0.02%, Al 4.4%, Ti 71.0% by weight percentage, and the balance is Fe;

[0043]The composition of metal manganese contains C 0.074%, Si 0.40%, P 0.03%, S 0.03%, Fe 1.7%, and the balance is Mn by weight percentage;

[0044] The composition of the iron-carbon alloy contains 4.00% C by weight percentage, and the balance is Fe and unavoidable impurities;

[0045] The composition of ferrosilicon alloy contains Si 74%, C 0.20%, P0.036%, S 0.016%, Al 1.7% by weight percentage, and the balance is Fe;

[0046] Put t...

Embodiment 3

[0051] Prepare industrial pure iron, boron-containing pig iron, ferro-titanium alloy, manganese metal, iron-carbon alloy, ferrosilicon alloy and pure aluminum as raw materials according to the set composition;

[0052] Among them, the composition of boron-containing pig iron contains C 3.3%, Si 2.9%, Mn 0.11%, P 0.05%, S 0.10%, B 0.20% by weight percentage, and the balance is Fe;

[0053] The composition of titanium-iron alloy contains C 0.26%, Si 0.45%, V 3.0%, P 0.03%, S 0.02%, Al 4.3%, Ti 69.8% by weight percentage, and the balance is Fe;

[0054] The composition of metal manganese contains C 0.071%, Si 0.35%, P 0.01%, S 0.02%, Fe 1.6%, and the balance is Mn by weight percentage;

[0055] The composition of the iron-carbon alloy contains 3.62% C by weight percentage, and the balance is Fe and unavoidable impurities;

[0056] The composition of ferrosilicon alloy contains Si 76%, C 0.17%, P 0.032%, S 0.019%, Al 1.6% by weight percentage, and the balance is Fe;

[0057] Put...