Low-temperature-resistant corrosion-resistant H-shaped steel with yield strength of 800 MPa and preparation method thereof

A yield strength, 800mpa technology, applied in the field of low-temperature corrosion-resistant H-beam and its preparation, can solve the problem of low strength level, and achieve the effects of low production cost, stable performance and high strength

Active Publication Date: 2019-07-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the strength level of H-shaped steel used in China is relatively low, most of which use Q235 and Q345 grades, and the proportion of grades above Q345 is relatively small

Method used

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  • Low-temperature-resistant corrosion-resistant H-shaped steel with yield strength of 800 MPa and preparation method thereof
  • Low-temperature-resistant corrosion-resistant H-shaped steel with yield strength of 800 MPa and preparation method thereof
  • Low-temperature-resistant corrosion-resistant H-shaped steel with yield strength of 800 MPa and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Carry out smelting and casting according to the above composition range, and then detect the composition of the slab, composition 1 is shown in Table 1.

[0028] Table 1 Slab composition (wt.%)

[0029]

[0030] The rolling process adopts the following process: heating the cast slab from room temperature to 1210°C, holding it for 120min, starting the rough rolling at 1160°C, starting the finish rolling at 1000°C, and finishing the finish rolling at 805°C. There is no deformation at -890°C, and the compression ratio is 6.3. At this time, the structure types of hot-rolled H-beams are ferrite and pearlite, see figure 1 As shown in (a), the heat treatment process is as follows: heat the H-shaped steel to 900°C and keep it for 30 minutes, then cool it to room temperature at a cooling rate of about 80°C / s, then heat the H-shaped steel to 600°C and keep it for 30 minutes, and then take it out of the furnace and air-cool it to room temperature. At this time, the structure t...

Embodiment 2

[0034] Carry out smelting and casting according to the above composition range, and then detect the composition of the slab, composition 2 is shown in Table 3.

[0035] Table 3 Slab composition (wt.%)

[0036]

[0037] The rolling process adopts the following process: heating the cast slab from room temperature to 1210°C, holding it for 130 minutes, starting the rough rolling at 1160°C, starting the finish rolling at 1000°C, and finishing the finish rolling at 800°C. There is no deformation at -900°C, and the compression ratio is 7.2. At this time, the structure types of hot-rolled H-beams are ferrite and pearlite, see figure 2 As shown in (a), the heat treatment process is as follows: heat the H-shaped steel to 900°C and keep it for 30 minutes, then cool it to room temperature at a cooling rate of about 40°C / s, then heat the H-shaped steel to 550°C and keep it for 30 minutes, and then take it out of the furnace and air-cool it to room temperature. At this time, the struc...

Embodiment 3

[0041] Carry out smelting and casting according to the above composition range, and then detect the composition of the slab, composition 3 is shown in Table 5.

[0042] Table 5 Slab composition (wt.%)

[0043]

[0044] The rolling process adopts the following process: heating the cast slab from room temperature to 1210°C, holding it for 150min, starting the rough rolling at 1160°C, starting the finish rolling at 1000°C, and finishing the finish rolling at 800°C. There is no deformation at -900°C, and the compression ratio is 7.2. At this time, the structure types of hot-rolled H-beams are ferrite and pearlite, see image 3 As shown in (a), the heat treatment process is as follows: heat the H-shaped steel to 900°C for 45 minutes, then cool it to room temperature at a cooling rate of about 80°C / s, then heat the H-shaped steel to 600°C for 45 minutes, and then take it out of the furnace and air-cool it to room temperature. At this time, the structure type of H-shaped steel is...

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Abstract

The invention discloses low-temperature-resistant corrosion-resistant H-shaped steel with the yield strength of 800 MPa and a preparation method thereof, and belongs to the technical field of metal material processing. The H-shaped steel comprises the following chemical components of, by mass, 0.10%-0.20% of C, 0.20%-0.40% of Si, 1.20%-1.60% of Mn, 0.2%-0.4% of Ni, 0.2%-0.6% of Cr, 0.06%-0.10% ofV, 0-0.04% of Nb, 0.01%-0.02% of Ti, 100-150ppm, less than or equal to 0.020% of P, less than or equal to 0.020% of S and the balance Fe and inevitable impurities. The preparation process comprises the following steps of first blank preparing, second hot rolling and quenching and tempering treatment after hot rolling, wherein the hot rolling temperature is 1180-1150 DEG C, the final rolling temperature is 800 DEG C-890 DEG C, the quenching treatment temperature is 900 DEG C, the cooling speed is 30-100 DEG C / s, and the tempering treatment temperature is 450-600 DEG C. The obtained H-shaped steel has the yield strength larger than or equal to 800 MPa, the tensile strength of 860-940 MPa, the elongation rate after fracture larger than or equal to 14.0, and the low-temperature impact at minus20 DEG C larger than or equal to 50J.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and introduces a low-temperature and corrosion-resistant H-shaped steel with a yield strength of 800 MPa and a preparation method thereof. [0002] technical background [0003] With the promulgation of the "13th Five-Year Plan" National Science and Technology Innovation Plan, the focus of my country's marine resource development and utilization technology has been clarified, and it is required to vigorously develop the exploration of polar resources and the development of key core technologies. At the same time, "Made in China 2025" clearly pointed out that marine engineering equipment will be accelerated as one of the ten key development areas, so China will urgently need advanced marine engineering equipment with excellent performance in the future. [0004] For marine engineering equipment, H-shaped steel is an essential structural material. With the rapid development of off...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/46C22C38/48C22C38/50C22C38/58C21D8/02C21D1/18
CPCC21D1/18C21D8/0226C22C38/001C22C38/002C22C38/02C22C38/04C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 于浩黄章吴伟嘉黎淑英
Owner UNIV OF SCI & TECH BEIJING
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