Antimony-containing yield-strength 350MPa-level high-corrosion hot rolled H-shaped steel and production method thereof

A production method and H-shaped steel technology, applied in the field of antimony-containing high-corrosion-resistant hot-rolled H-shaped steel with a yield strength of 350MPa, can solve the problems of increased productivity and reduced production costs, and achieve good low-temperature impact toughness and improved product surface quality. Effect

Inactive Publication Date: 2018-07-06
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the high-weather resistance hot-rolled H-beam with a yield strength of 500 MPa disclosed in this patent document, the Nb content ranges from 0.04 to 0.06 wt%, and the higher amount of V is replaced by Nb, and other alloy elements with lower amounts are used. High weather resistance hot-rolled H-beam products can meet the steel strength requirements, and the production cost is greatly reduced, but with the increase in productivity, some insurmountable quality defects appear in the production process

Method used

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  • Antimony-containing yield-strength 350MPa-level high-corrosion hot rolled H-shaped steel and production method thereof
  • Antimony-containing yield-strength 350MPa-level high-corrosion hot rolled H-shaped steel and production method thereof
  • Antimony-containing yield-strength 350MPa-level high-corrosion hot rolled H-shaped steel and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0021] An antimony-containing high-corrosion-resistant hot-rolled H-shaped steel with a yield strength of 350MPa. The chemical composition of the H-shaped steel is: carbon 0.063%, silicon 0.23%, manganese 1.41%, phosphorus 0.021%, sulfur 0.007%, vanadium 0.11%, antimony 0.059%, chromium 0.91%, and the rest are trace impurities of iron residue.

[0022] The production method of the above-mentioned antimony-containing high-corrosion-resistant hot-rolled H-shaped steel with a yield strength of 350MPa is as follows:

[0023] Steel billet heating process control: heating temperature is controlled at 1180-1280°C; rolling temperature process control: rolling temperature is controlled at 1080°C; 3-stand universal rolling pass is controlled at 973°C, and final rolling temperature is controlled at 855°C ℃; cooling process control: air cooling; the reduction rate of the universal pass is controlled above 47%, and the cooling process is air cooling.

[0024] The 630x200x15x20 hot-rolled ...

Embodiment 2

[0026] An antimony-containing high-corrosion-resistant hot-rolled H-shaped steel with a yield strength of 350MPa. The chemical composition of the H-shaped steel is: carbon 0.068%, silicon 0.25%, manganese 1.40%, phosphorus 0.022%, sulfur 0.007%, vanadium 0.10%, antimony 0.065%, chromium 1.01%, and the rest are trace impurities of iron residue.

[0027] The production method of the above-mentioned antimony-containing high-corrosion-resistant hot-rolled H-shaped steel with a yield strength of 350MPa is as follows:

[0028] Billet heating process control: heating temperature is controlled at 1180-1280°C; rolling temperature process control: rolling temperature is controlled at 1090°C; 3-stand universal rolling pass is controlled at 961°C, and final rolling temperature is controlled at 843°C ℃; cooling process control: air cooling; the reduction rate of the universal pass is controlled above 49%, and the cooling process is air cooling.

[0029] The hot-rolled H-shaped steel of 60...

Embodiment 3

[0031] A high-corrosion-resistant hot-rolled H-shaped steel with a yield strength of 350MPa containing antimony. The chemical composition of the H-shaped steel is: carbon 0.070%, silicon 0.22%, manganese 1.38%, phosphorus 0.020%, sulfur 0.007%, vanadium 0.11%, antimony 0.069%, chromium 1.31%, and the rest are trace impurities of iron residue.

[0032] The production method of the above-mentioned antimony-containing high-corrosion-resistant hot-rolled H-shaped steel with a yield strength of 350MPa is as follows:

[0033] Billet heating process control: heating temperature is controlled at 1180-1260°C; rolling temperature process control: rolling temperature is controlled at 1100°C; 3-stand universal rolling pass is controlled at 975°C, and final rolling temperature is controlled at 852°C ℃; cooling process control: air cooling; the reduction rate of the universal pass is controlled above 49%, and the cooling process is air cooling.

[0034] The hot-rolled H-shaped steel of 650...

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Abstract

The invention provides antimony-containing yield-strength 350MPa-level high-corrosion hot rolled H-shaped steel and a production method thereof. The H-shaped steel is prepared from the chemical ingredients in percentage by mass: 0.06 to 0.15% of carbon, 0.20 to 0.55% of silicon, 1.00 to 1.45% of manganese, smaller than or equal to 0.025% of phosphorus, smaller than or equal to 0.015% of sulphur, 0.030 to 0.150% of vanadium, 0.050 to 0.090% of antimony, 0.9 to 2.20% of chromium and the balance of trace impurities of iron residues. Compared to the prior art, according to the invention, the H-shaped steel produced by the production method has yield strength of over 380Mpa, toughness at a low temperature of -40 DEG C of over 100J and has excellent toughness of resisting to low temperature impact. The antimony-containing yield-strength 350MPa-level high-corrosion hot rolled H-shaped steel can meet a condition that when the antimony-containing yield-strength 350MPa-level high-corrosion hot rolled H-shaped steel is totally immersed for 24 hours in solution with sulfuric acid concentration of 20% at a temperature of 25 DEG C, a relative corrosion rate with Q345B is smaller than or equal to10%; and compared with common weathering resistant steel, the antimony-containing yield-strength 350MPa-level high-corrosion hot rolled H-shaped steel is obviously improved in product surface quality.

Description

technical field [0001] The invention belongs to the technical field of metal material production, and in particular relates to antimony-containing hot-rolled H-shaped steel with a yield strength of 350 MPa and a production method thereof. Background technique [0002] In recent years, with the rapid development of my country's national economy, railway transportation is gradually changing to high-speed and heavy-duty. The demand for high-strength and high-weathering steel is increasing, and the requirements for corrosion resistance are also increasing. [0003] Chinese Invention Patent: Publication (Announcement) No. CN102021495A, a 420MPa high-toughness weather-resistant bridge steel and its hot-rolled coil preparation method. This patent adopts low temperature coiling at 450°C to 600°C to obtain acicular ferrite structure. Due to the low C content, a large amount of Mn and microalloying element Nb are added to improve the strength, and the production cost is high. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/02C22C38/04C22C38/24C21D8/00
CPCC21D8/005C21D2211/005C21D2211/008C21D2211/009C22C38/02C22C38/04C22C38/24C22C38/60Y02P10/20
Inventor 彦井成吴保桥程鼎张卫斌吴坚龚庆华邢军夏勐魏银丹汪杰蒲玉梅张步海
Owner MAGANG (GROUP) HOLDING CO LTD
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