CN116926291A - A method for manufacturing high-strength, high-toughness, corrosion-resistant hot-rolled H-shaped steel - Google Patents

Abstract

The invention discloses a manufacturing method of high-strength high-toughness corrosion-resistant hot rolled H-shaped steel, which comprises the steps of special-shaped blank heating, rough rolling, finish rolling and cooling; the H-shaped steel comprises the following chemical components in percentage by mass: 0.07 to 0.15 percent of C, 0.15 to 0.50 percent of Si, 1.10 to 1.60 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, 0.020 to 0.050 percent of Nb, 0.05 to 0.10 percent of V, 0.20 to 0.50 percent of Cu, 0.20 to 0.50 percent of Ni, 0.20 to 0.50 percent of Cr, and the balance of Fe and unavoidable impurities, wherein the mass fraction is 100 percent. The hot rolled H-shaped steel manufactured by the method has the characteristics of high strength, high toughness and corrosion resistance.

Description

A method for manufacturing high-strength, high-toughness and corrosion-resistant hot-rolled H-shaped steel

Technical field

The invention relates to the field of manufacturing new alloy steel materials, and in particular to a method for manufacturing high-strength, high-toughness and corrosion-resistant hot-rolled H-shaped steel.

Background technique

With the continuous development of the country's economy and the acceleration of urbanization, the demand for steel in the construction industry is also increasing. H-shaped steel with high strength, high toughness and corrosion resistance can meet the requirements of building structure design and improve the safety and wind and earthquake resistance of the building. Shipbuilding is another potential application area. H-shaped steel with high strength, high toughness and corrosion resistance can enhance the structural strength and stability of the hull and improve the navigation safety of the ship. Bridge construction requires the use of a large amount of steel, and H-shaped steel with high strength, high toughness and corrosion resistance can improve the load-bearing capacity and durability of the bridge, and reduce the maintenance and use costs of the bridge. H-shaped steel with high strength, high toughness and corrosion resistance can also be widely used in the petrochemical industry, such as oil tanks, petrochemical equipment and pipelines, etc. It can improve the safety and corrosion resistance of equipment and reduce equipment maintenance and replacement costs. . Based on the characteristics of its own technical equipment, a steel mill organized technical research and successfully developed high-strength, high-toughness and corrosion-resistant hot-rolled H-shaped steel.

Contents of the invention

In order to solve the above technical problems, the object of the present invention is to provide a method for manufacturing a high-strength, high-toughness and corrosion-resistant hot-rolled H-shaped steel. The hot-rolled H-shaped steel has the characteristics of high strength, high toughness and corrosion resistance.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

The present invention is a method for manufacturing high-strength, high-toughness and corrosion-resistant hot-rolled H-shaped steel, which includes heating, rough rolling, finishing rolling and cooling of profiled blanks; wherein:

Heating of special-shaped billet: Heating the special-shaped continuous casting billet in a digitally controlled heating furnace. The heating temperature of the billet is 1180-1255℃, the soaking temperature is 1190-1235℃, the soaking time is not less than 30min, and the total holding time is 2.5-4 hours, it must be descaled with high-pressure water after being released from the oven;

Rough rolling: Rough rolling temperature is 1040-1120°C, water cooling is used for controlled cooling, rolling passes are 3-5 times, the total deformation is ≥50%, and then the rough-rolled profile billet is sent to the finishing rolling mill station for rolling ;

Finishing rolling: finishing rolling temperature 920-960℃, finishing rolling adopts warm rolling and water-cooling controlled rolling, rolling passes 5-7 times; final rolling temperature 860-890℃, total reduction of two-stage rolling ≥ 70%;

Cooling: After the rolling is completed, it is air-cooled and entered into the cooling bed for centralized cooling; after the temperature drops below 100°C, it is straightened in the straightening machine, and finally cut to length and bundled.

Furthermore, the finished product size is H700mm×300mm×13mm×24mm.

Further, the mass percentage of the chemical components of the H-shaped steel includes: C 0.07% ~ 0.15%, Si 0.15% ~ 0.50%, Mn 1.10% ~ 1.60%, P ≤ 0.020%, S ≤ 0.020%, Nb 0.020 %~0.050%, V0.05~0.10%, Cu 0.20~0.50%, Ni 0.20~0.50%, Cr 0.20~0.50%, the rest is Fe and inevitable impurities, the total mass fraction is 100%.

Further, the mass percentage of the chemical composition of the H-shaped steel includes: C 0.10%, Si 0.41%, Mn 1.40%, P 0.015%, S 0.005%, Nb 0.040%, V 0.060%, Cu 0.29%, Ni 0.28%, Cr 0.29%, the rest is Fe and inevitable impurities, the mass fraction totals 100%.

Further, the mass percentage of the chemical composition of the H-shaped steel includes: C 0.11%, Si 0.42%, Mn 1.37%, P 0.018%, S 0.006%, Nb 0.038%, V 0.060%, Cu 0.28%, Ni 0.27%, Cr 0.30%, the rest is Fe and inevitable impurities, the mass fraction totals 100%.

Further, the mass percentage of the chemical composition of the H-shaped steel includes: C 0.11%, Si 0.38%, Mn 1.36%, P 0.016%, S 0.004%, Nb 0.039%, V 0.050%, Cu 0.31%, Ni 0.28%, Cr0.28%, the rest is Fe and inevitable impurities, the mass fraction totals 100%.

Further, the mass percentage of the chemical composition of the H-shaped steel includes: C 0.12%, Si 0.37%, Mn 1.39%, P 0.014%, S 0.005%, Nb 0.038%, V 0.070%, Cu 0.28%, Ni 0.30%, Cr 0.29%, the rest is Fe and inevitable impurities, the mass fraction totals 100%.

Compared with the existing technology, the beneficial technical effects of the present invention are:

The surface quality of high-strength, high-toughness and corrosion-resistant hot-rolled H-shaped steel is inspected, and the mechanical properties are also inspected.

During the inspection process, no obvious surface quality defects of the finished product were found, and the surface quality was good. All properties of the rolled H-shaped steel met the standard requirements.

The hot-rolled steel material of the present invention not only has high strength and high toughness, but also has high corrosion resistance, and has the characteristics of "one steel with multiple functions".

Detailed ways

A method for manufacturing high-strength, high-toughness and corrosion-resistant hot-rolled H-shaped steel

The action process of the present invention is as follows:

The present invention will be further described in detail below with reference to examples.

Table 1 Chemical composition of each example (mass percentage/%)

Example C Si Mn P S Nb V Cu Ni Cr Example 1 0.10 0.41 1.40 0.015 0.005 0.040 0.060 0.29 0.28 0.29 Example 2 0.11 0.42 1.37 0.018 0.006 0.038 0.060 0.28 0.27 0.30 Example 3 0.11 0.38 1.36 0.016 0.004 0.039 0.050 0.31 0.28 0.28 Example 4 0.12 0.37 1.39 0.014 0.005 0.038 0.070 0.28 0.30 0.29

Table 2 Heating and rolling control of each example

Table 3 Mechanical properties of each example after rolling H-shaped steel

Table 4 Corrosion resistance index of each example

Example Corrosion resistance index I Example 1 6.41 Example 2 6.41 Example 3 6.45 Example 4 6.32

The above-described embodiments only describe the preferred modes of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, those of ordinary skill in the art can make various modifications to the technical solutions of the present invention. All deformations and improvements shall fall within the protection scope determined by the claims of the present invention.

Claims (7)

1. A method for manufacturing high-strength, high-toughness and corrosion-resistant hot-rolled H-shaped steel, which is characterized by including heating, rough rolling, finishing rolling and cooling of the profile blank; wherein: Heating of special-shaped billet: Heating the special-shaped continuous casting billet in a digitally controlled heating furnace. The heating temperature of the billet is 1180-1255℃, the soaking temperature is 1190-1235℃, the soaking time is not less than 30min, and the total holding time is 2.5-4 hours, it must be descaled with high-pressure water after being released from the oven; Rough rolling: The rough rolling temperature is 1040-1120°C, water cooling is used for controlled cooling, the rolling passes are 3-5 times, the total deformation is ≥50%, and then the rough-rolled profile billet is sent to the finishing rolling mill station for rolling ; Finishing rolling: finishing rolling temperature 920-960℃, finishing rolling adopts warm rolling and water-cooling controlled rolling, rolling passes 5-7 times; final rolling temperature 860-890℃, total reduction of two-stage rolling ≥ 70%; Cooling: After the rolling is completed, it is air-cooled and entered into the cooling bed for centralized cooling; after the temperature drops below 100°C, it is straightened in the straightening machine, and finally cut to length and bundled. 2. The manufacturing method of high-strength, high-toughness and corrosion-resistant hot-rolled H-shaped steel according to claim 1, characterized in that the finished product size is H700mm×300mm×13mm×24mm. 3. The manufacturing method of high-strength, high-toughness and corrosion-resistant hot-rolled H-shaped steel according to claim 1, characterized in that the mass percentage of the chemical composition of the H-shaped steel includes: C0.07% ~ 0.15%, Si0.15 %～0.50%, Mn1.10%～1.60%, P≤0.020%, S≤0.020%, Nb0.020%～0.050%, V0.05～0.10%, Cu0.20～0.50%, Ni0.20～0.50 %, Cr0.20~0.50%, the rest is Fe and inevitable impurities, the mass fraction totals 100%. 4. The manufacturing method of high-strength, high-toughness and corrosion-resistant hot-rolled H-shaped steel according to claim 3, characterized in that the mass percentage of the chemical composition of the H-shaped steel includes: C0.10%, Si0.41%, Mn1 .40%, P0.015%, S0.005%, Nb0.040%, V0.060%, Cu0.29%, Ni0.28%, Cr0.29%, the rest is Fe and inevitable impurities, mass fraction Total 100%. 5. The manufacturing method of high-strength, high-toughness and corrosion-resistant hot-rolled H-shaped steel according to claim 3, characterized in that the mass percentage of the chemical composition of the H-shaped steel includes: C0.11%, Si0.42%, Mn1 .37%, P0.018%, S0.006%, Nb0.038%, V0.060%, Cu0.28%, Ni0.27%, Cr0.30%, the rest is Fe and inevitable impurities, mass fraction Total 100%. 6. The manufacturing method of high-strength, high-toughness and corrosion-resistant hot-rolled H-shaped steel according to claim 3, characterized in that the mass percentage of the chemical composition of the H-shaped steel includes: C0.11%, Si0.38%, Mn1 .36%, P0.016%, S0.004%, Nb0.039%, V0.050%, Cu0.31%, Ni0.28%, Cr0.28%, the rest is Fe and inevitable impurities, mass fraction Total 100%. 7. The manufacturing method of high-strength, high-toughness and corrosion-resistant hot-rolled H-shaped steel according to claim 3, characterized in that the mass percentage of the chemical composition of the H-shaped steel includes: C0.12%, Si0.37%, Mn1 .39%, P0.014%, S0.005%, Nb0.038%, V0.070%, Cu0.28%, Ni0.30%, Cr0.29%, the rest is Fe and inevitable impurities, mass fraction Total 100%.