CN103422026A - High strength steel containing niobium and titanium - Google Patents

Abstract

The invention belongs to the field of production of rolled steel, and particularly relates to high strength steel containing niobium and titanium, which is characterized in that the raw material of the steel comprises a part of or all of carbon, silicon, manganese, chromium, nickel, niobium, titanium and iron. The production technology comprises the following steps: (1) weighing; (2) crushing and grinding; (3) mixing and stirring; (4) smelting; (5) cooling; (6) performing heat treatment. The high strength steel prepared by the invention has higher strength and toughness, and moreover, the steel is simple in production technology and low in production cost, and can be applied in fields of machinery, automobile, building and the like, and has the broad application prospect, so that the steel has higher practicability and popularization and application value.

Description

A kind of high-strength steel containing niobium and titanium

Technical field

The invention belongs to the steel production field, is a kind of high-strength steel containing niobium and titanium specifically.

Background technology

Ferrous materials is current most widely used metallic substance, in a lot of industries such as machinery, automobile, building, extensive application is arranged.Intensity is one of most important index of steel, is also the major reason that steel are better than other types of material.

The intensity of steel is high, and product just is not easy fracture and viscous deformation, and just can extend work-ing life, and can avoid the production development accident; In addition, use high-strength steel, can also reduce the consumption of steel in member, thereby reduce the production cost of member; The weight saving of member, can also reduce the consumption to the energy.

So, for many years, the ferrous materials producer and investigator are making great efforts to adopt several different methods to improve the intensity of steel always, as added the alloying elements such as manganese, chromium, nickel in steel, or adopt the thermal treatment process such as quenching, tempering, what also have carries out the measures such as work hardening, crystal grain thinning.But aforesaid method has limitation separately, such as, the research discovery, the alloying elements such as manganese, chromium, nickel are limited to putting forward high-intensity effect, if increase their consumption, the production cost of steel will increase; Heat treating method is stricter to the requirement of processing parameter, therefore higher to operator's technical requirements, is not easy to grasp; The measure such as work hardening, crystal grain thinning need to have specific equipment, and stricter to the requirement of processing parameter.

For these reasons, in the market in the urgent need to improving the novel method of steel strength, and there is good feasibility.The contriver of this patent is engaged in alloy designs and the Study of optimization work of steel for many years always, explore the certain law existed between alloying constituent, complete processing and the mechanical property of tapping, at the steel production field, there is more important theory significance and wide application prospect.

Summary of the invention

The objective of the invention is to overcome the defect that conventional art exists, produce a kind of high-intensity new steel grade that has, this new steel grade has high strength on the one hand, has higher toughness simultaneously.Feature of the present invention is to contain a certain amount of niobium and boron, is smelted, produces after thermal treatment process and have high-intensity steel.

Production method of the present invention is:

1. the chemical composition of high-strength steel and weight percentage thereof are:

Carbon: 0.01-0.25%;

Silicon: 0.1-5.5%;

Manganese: 0.2-1.8%;

Chromium: 0.05-1.5%;

Nickel: 0.05-1.5%;

Niobium: 0.001-3.5%;

Titanium: 0.001-3.5%;

All the other are iron;

Above-mentioned raw materials can be used also simultaneously and can partly use, and according to the performance requriements to product and production cost, determines.

2. the production technique of high-strength steel is:

(1) various raw materials of weighing on request;

(2) by block raw material crushing, grinding;

(3) various raw materials are put into to container and mix and stir, make material composition even;

(4) raw material mixed is put into to smelting furnace and smelted, Heating temperature is 800-2200 ℃;

(5) pour molten steel into crucible, be cooled to room temperature, obtain steel ingot;

(6) take out steel ingot from crucible, then heat-treat technique, finally obtain finished product.

Niobium in steel and titanium can improve the hardening capacity of steel effectively, make steel obtain martensitic stucture after Overheating Treatment, make steel have higher intensity, and, they can also refinement microstructure size, crystal grain is diminished, this can improve the intensity of steel equally effectively.

 

Beneficial effect of the present invention:

High-strength steel produced according to the invention has high intensity, but also has higher toughness, and product just is not easy fracture and viscous deformation, thereby can guarantee the work-ing life of workpiece.In addition, the intensity of this steel is high, is conducive to reduce the consumption of steel in member, thereby reduces the production cost of member, can be used for the fields such as machinery, automobile, building, has broad application prospects.

Chemical composition of the present invention is simple, and or not containing valuable alloying element, cost is not lower.

Aspect production technique, production technique of the present invention is simple, lower to the requirement of equipment, and operator's technical ability is not had to particular requirement yet, and the common laborer can operate.

In sum, the present invention has higher practicality and application value.

 

The accompanying drawing explanation:

Fig. 1 is the production technological process of high-strength steel.

 

Embodiment:

Embodiment 1: press shown in Fig. 1, chemical composition and weight percentage thereof are:

Carbon: 0.01-0.25%;

Silicon: 0.1-5.5%;

Manganese: 0.2-1.8%;

Chromium: 0.05-1.5%;

Nickel: 0.05-1.5%;

Niobium: 0.001-3.5%;

Titanium: 0.001-3.5%;

All the other are iron;

Production technique is:

(1) various raw materials of weighing on request;

(2) by block raw material crushing, grinding;

(3) various raw materials are put into to container and mix and stir, make material composition even;

(4) raw material mixed is put into to smelting furnace and smelted, Heating temperature is 1800 ℃;

(5) pour molten steel into crucible, be cooled to room temperature, obtain steel ingot;

(6) take out steel ingot from crucible, then heat-treat technique, finally obtain finished product.

 

Embodiment 2: press shown in Fig. 1, chemical composition and weight percentage thereof are:

Carbon: 0.01-0.25%;

Silicon: 0.1-5.5%;

Niobium: 0.001-3.5%;

Titanium: 0.001-3.5%;

All the other are iron;

Production technique is:

(1) various raw materials of weighing on request;

(2) by block raw material crushing, grinding;

(3) various raw materials are put into to container and mix and stir, make material composition even;

(4) raw material mixed is put into to smelting furnace and smelted, Heating temperature is 1900 ℃;

(5) pour molten steel into crucible, be cooled to room temperature, obtain steel ingot;

(6) take out steel ingot from crucible, then heat-treat technique, finally obtain finished product.

 

Embodiment 3: press shown in Fig. 1, chemical composition and weight percentage thereof are:

Carbon: 0.01-0.25%;

Silicon: 0.1-5.5%;

Manganese: 0.2-1.8%;

Niobium: 0.001-3.5%;

Titanium: 0.001-3.5%;

All the other are iron;

Production technique is:

(1) various raw materials of weighing on request;

(2) by block raw material crushing, grinding;

(3) various raw materials are put into to container and mix and stir, make material composition even;

(4) raw material mixed is put into to smelting furnace and smelted, Heating temperature is 2000 ℃;

(5) pour molten steel into crucible, be cooled to room temperature, obtain steel ingot;

(6) take out steel ingot from crucible, then heat-treat technique, finally obtain finished product.

 

Embodiment 4: press shown in Fig. 1, chemical composition and weight percentage thereof are:

Carbon: 0.01-0.25%;

Manganese: 0.2-1.8%;

Nickel: 0.05-1.5%;

Niobium: 0.001-3.5%;

Titanium: 0.001-3.5%;

All the other are iron;

Production technique is:

(1) various raw materials of weighing on request;

(2) by block raw material crushing, grinding;

(3) various raw materials are put into to container and mix and stir, make material composition even;

(4) raw material mixed is put into to smelting furnace and smelted, Heating temperature is 2100 ℃;

(5) pour molten steel into crucible, be cooled to room temperature, obtain steel ingot;

(6) take out steel ingot from crucible, then heat-treat technique, finally obtain finished product.

Claims (2)

1. a high-strength steel, is characterized in that, its raw material is all or part of in carbon, silicon, manganese, chromium, nickel, niobium, titanium, iron, and its weight chemical constitution is: carbon: 0.01-0.25%; Silicon: 0.1-5.5%; Manganese: 0.2-1.8%; Chromium: 0.05-1.5%; Nickel: 0.05-1.5%; Niobium: 0.001-3.5%; Titanium: 0.001-3.5%; All the other are iron.

2. the production method of high-strength steel according to claim 1 is characterized in that it is realized by following step:

(1) various raw materials of weighing on request;

(2) by block raw material crushing, grinding;

(3) various raw materials are put into to container and mix and stir, make material composition even;

(4) raw material mixed is put into to smelting furnace and smelted, Heating temperature is 800-2200 ℃;

(5) pour molten steel into crucible, be cooled to room temperature, obtain steel ingot;

(6) take out steel ingot from crucible, then heat-treat technique, finally obtain finished product.

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