The invention discloses a multi-element nitralloy core-spun yarn and an application and an application method of the same to an HRB400 steel reinforcing treatment technology and belongs to the technical field of alloy material application. The yarn core of the multi-element nitralloy core-spun yarn comprises the following components (based on a percent by mass): 21-30% of N, 9-28% of V, 29-45% of Si, 0.05-6% of Mn, 0-4.0% of Ti, 0-3.5% of B, 0.12-1.3% of C, not larger than 0.10% of P, not larger than 0.10% of S and the balance of Fe and unavoidable impurities. The multi-element nitralloy component fully meets the requirements of the HRB400 steel micro-alloying reinforcing technology, the supply of N elements is fully ensured, and the positive correlation properties of all alloy elements are combined. Nitralloy micro-alloying treatment is carried out on molten steel by a technical method fully different from the traditional one, and the reinforcing effect of the multi-element nitralloy component is fully exerted. The multi-element nitralloy component has the advantages of being great in reinforcing effect, high in technical stability, high in target steel yield rate and the like.

Multi-element nitralloy core-spun yarn and application and application method of same to HRB400 steel reinforcing treatment technology

The invention belongs to the field of steel metallurgy, in particular to a Ti-contained microalloy building steel bar and a production method of the Ti-contained microalloy building steel bar. The Ti-contained microalloy building steel bar and the production method of the Ti-contained microalloy building steel bar aim to solve the problems that in the prior art, the selected vanadium nitride alloyused for preparing nitrogen-contained alloy steel is low in nitrogen content, less in type and the like. The Ti-contained microalloy building steel bar comprises, by weight, 0.15%-0.30% of C, 0.30%-1.00% of Si, 0.60%-1.30% of Mn, 0.0060%-0.0180% of N, not larger than 0.040% of P, not larger than 0.040% of S, 0.010%-0.050% of Ti and the balance Fe and inevitable impurities. The key of the preparation method of the Ti-contained microalloy building steel bar is that N-contained core-spun wires are fed at a furnace rear small platform, and the content of N is adjusted to be the appropriate level.The production method of the Ti-contained microalloy building steel bar is easy to operate, the nitrogen yield is high and stable, the production cost can also be effectively reduced, and the Ti-contained microalloy building steel bar and the production method of the Ti-contained microalloy building steel bar are worthy of application and popularization.

V and Nb-containing micro-alloy building steel bar and production method thereof

The invention belongs to the field of iron and steel metallurgy and particularly relates to a Nb-containing micro-alloy building steel wire rod and an LF production method thereof. The Nb-containing micro-alloy building steel wire rod and the LF production method thereof are provided in order to solve the problems that a vanadium nitride alloy selected for preparing nitrogen-containing alloy steelin the prior art is low in nitrogen content, small in variety and the like. The Nb-containing micro-alloy building steel wire rod comprises the components of, by weight, 0.15%-0.30% of C, 0.30%-1.00%of Si, 0.60%-1.30% of Mn, 0.0060%-0.0180% of N, no more than 0.040% of P, no more than 0.040% of S, 0.010%-0.050% of V and the balance Fe and inevitable impurities. The key point of the preparation method of the Nb-containing micro-alloy building steel wire rod is that N-containing core-spun yarn is fed in an LF for adjusting the N content to the appropriate level. The method is easy to operate,the nitrogen yield is high and stable, the production cost can be further reduced effectively, and thus the Nb-containing micro-alloy building steel wire rod is worth using and popularizing.

V, Nb and Cr contained microalloy building steel wire rod and LF production method thereof

The invention belongs to the field of steel and iron metallurgy, and in particular, relates to a V, Nb and Ti-contained microalloy construction steel rod and a preparation method thereof. Aiming at the problems of low nitrogen content and few types of vanadium nitride alloys selected for traditional preparation of nitrogen-contained alloy steel, the invention provides the V, Nb and Ti-contained microalloy construction steel rod and the preparation method thereof. The rod comprises the following components in percentage by weight: 0.15-0.30% of C, 0.30-1.00% of Si, 0.60-1.30% of Mn, 0.0060-0.0180% of N, P not more than 0.040%, S not more than 0.040%, 0.010-0.080% of V, 0.010-0.030% of Nb, 0.010-0.030% of Ti, and the balance of Fe and inevitable impurities. The preparation method is characterized in that N-contained core-spun yarns are fed in a small platform after a furnace and N is adjusted to a proper level. The method is simple in operation; the nitrogen yield is high and stable; theproduction cost can be effectively reduced; and the method deserves popularization and application.

V, Nb and Ti-contained microalloy construction steel rod and preparation method thereof

The invention relates to a 500 MPa level high-nitrogen composite microalloyed steel bar and a production method thereof. The 500 MPa level high-nitrogen composite microalloyed steel bar comprises thefollowing chemical components of, by mass, 0.18-0.25 parts of C, 0.40-0.80 parts of Si, 1.30-1.60 parts of Mn, less than or equal to 0.045 parts of P, less than or equal to 0.045 parts of S, 0.020-0.040 parts of V, 0.010-0.040 parts of Nb, 0.010-0.040 parts of Ti, 0.0090-0.0150 parts of N, and the balance iron and unavoidable impurity elements. In the production method, after the continuous casting process is completed, a continuous casting billet is heated to 1130-1250 DEG C and subjected to heat preservation for 90-150 minutes, and then cooled to 1020-1120 DEG C for rolling; after the rolling, water cooling is carried out with the water pressure being 0.1-0.5 MPa and the temperature of an upper cooling bed being controlled at 920-1010 DEG C; and the steel bar is naturally cooled after entering the cooling bed, so that the high-nitrogen composite microalloyed steel bar is obtained. The mechanical properties of the steel bar meet the requirements of the national standard, the production cost is low and a production process is simple and easy to implement.

400 MPa-grade high-nitrogen composite microalloyed steel bar and production method thereof

The invention discloses a hot-rolled 400MPa grade high-strength steel bar for reinforced concrete and a production method for the steel bar, and belongs to the technical field of micro-alloying of ferrous metallurgy. The steel in the steel bar comprises the following chemical components in percentage by weight: 0.16 to 0.25 percent of C, 0.20 to 0.80 percent of Si, 1.20 to 1.50 percent of Mn, 0.02 to 0.06 percent of Ti, less than or equal to 0.01 percent of N, less than or equal to 0.045 percent of S, less than or equal to 0.045 percent of P, and the balance of Fe and inevitable impurities. The preparation method for the steel bar comprises the following steps of: a, smelting crude molten steel, tapping, deoxidizing and alloying; b, refining, finely regulating the components, and pouring; and c, hot rolling, wherein titanium is alloyed in the tapping process and after deoxidizing or in the refining process. By using the principle that the titanium plays a role in precipitation and reinforcement in the steel, the mechanical properties of the steel such as yield strength and tensile strength are improved, and the property requirement of the 400MPa grade high-strength steel bar is met..

Titanium micro-alloyed 400MPa grade high-strength steel bar and production method thereof

The invention discloses a vanadium and titanium compound microalloyed steel bar and a production method thereof. The steel in the steel bar comprises the following chemical components in percentage by weight: 0.16 to 0.25 percent of C, 0.20 to 0.80 percent of Si, 1.20 to 1.50 percent of Mn, 0.001 to 0.12 percent of Ti, 0.001 to 0.10 percent of V, less than or equal to 0.01 percent of N, less than or equal to 0.045 percent of S, less than or equal to 0.045 percent of P, and the balance of Fe and inevitable impurities. The production method for the steel bar comprises the following steps of: a, smelting crude molten steel, tapping, deoxidizing and alloying; b, refining, trimming the components to make the components meet the component requirement of the steel bar, and casting; and c, performing hot rolling, wherein alloying vanadium and titanium after deoxidizing in the process of tapping, or in the process of refining. According to the vanadium and titanium compound microalloyed steel bar, the yield strength and the tensile strength of the steel are improved under the condition of not changing the ductility of the steel, and the performance requirements of the steel bars in 400 MPa or 500 MPa of grades are met.

Yong Yang

Papers

Titanium micro-alloyed 400MPa grade high-strength steel bar and production method thereof

Vanadium and titanium compound microalloyed steel bar and production method thereof

Titanium microalloyed 500-MPa high-strength steel bar and production method thereof