Weathering steel with low yield ratio and high strength and production method of weathering steel

A technology with low yield ratio and production method, which is applied in the field of metallurgy, can solve the problems of low strength level, easy brittle failure, scrapping of metal equipment and materials, etc., and achieve the effect of improving strength, toughness, shock resistance and ensuring corrosion resistance

Active Publication Date: 2019-01-08
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Corrosion of iron and steel materials has always been a worldwide problem. It not only leads to the scrapping of metal equipment and materials, but also causes major economic losses, and even brings serious social problems such as environmental pollution and casualties.
[0004] At present, the yield strength of most traditional weathering steels is mainly 345MPa, and the strength level is low, which restricts the promotion and application of weathering steels; Poor resistance, prone to brittle failure in earthquakes, not suitable for construction and other fields

Method used

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  • Weathering steel with low yield ratio and high strength and production method of weathering steel
  • Weathering steel with low yield ratio and high strength and production method of weathering steel
  • Weathering steel with low yield ratio and high strength and production method of weathering steel

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Effect test

Embodiment 1

[0039] The thickness of the low-yield-ratio high-strength weathering steel in this example is 10mm, and its chemical composition and mass percentage are shown in Table 1.

[0040] The production method of the high-strength weathering steel with low yield ratio in this embodiment includes smelting, continuous casting, slab heating, controlled rolling, and controlled cooling. The specific process steps are as follows:

[0041] (1) Smelting and continuous casting process: After smelting, the molten steel is continuously cast into a slab, and the thickness of the slab is 150mm;

[0042] (2) Billet heating process: billet heating temperature 1200°C, holding time 2h;

[0043] (3) Controlled rolling process: the starting temperature of rough rolling is 1070°C, the rough rolling single-pass reduction ratios are 20.0%, 24.2%, 27.9%, 29.9%, 30.0% and 29.8%, respectively, and the rough rolling cumulative reduction The final rolling temperature of rough rolling is 1014℃; the starting tem...

Embodiment 2

[0048]The thickness of the low-yield-ratio high-strength weathering steel in this example is 6 mm, and its chemical composition and mass percentage are shown in Table 1.

[0049] The production method of the high-strength weathering steel with low yield ratio in this embodiment includes smelting, continuous casting, slab heating, controlled rolling, and controlled cooling. The specific process steps are as follows:

[0050] (1) Smelting and continuous casting process: After smelting, the molten steel is continuously cast into a slab, and the thickness of the slab is 150mm;

[0051] (2) Billet heating process: billet heating temperature 1250°C, holding time 2h;

[0052] (3) Controlled rolling process: the starting temperature of rough rolling is 1150°C, the rough rolling single-pass reduction rates are 20.0%, 23.3%, 27.2%, 28.4%, 29.2% and 29.4%, respectively, and the rough rolling cumulative reduction The final rolling temperature of rough rolling is 1088℃; the starting tempe...

Embodiment 3

[0057] The thickness of the low-yield-ratio high-strength weathering steel in this example is 12 mm, and its chemical composition and mass percentage are shown in Table 1.

[0058] The production method of the high-strength weathering steel with low yield ratio in this embodiment includes smelting, continuous casting, slab heating, controlled rolling, and controlled cooling. The specific process steps are as follows:

[0059] (1) Smelting and continuous casting process: After smelting, the molten steel is continuously cast into a slab, and the thickness of the slab is 150mm;

[0060] (2) Billet heating process: billet heating temperature 1200°C, holding time 1h;

[0061] (3) Controlled rolling process: the starting temperature of rough rolling is 1050°C, the rough rolling single-pass reduction rates are 20.0%, 23.3%, 27.2%, 28.4%, 29.2% and 29.4%, respectively, and the rough rolling cumulative reduction Ratio of 84.0%, rough rolling finish rolling temperature 993°C; finish ro...

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Abstract

The invention discloses weathering steel with low yield ratio and high strength and a production method of the weathering steel. The weathering steel comprises chemical components in percentage by mass as follows: 0.08%-0.10% of C, 0.25%-0.30% of Si, 1.30%-1.50% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.010% of S, 0.25%-0.30% of Ni, 0.45%-0.50% of Cr, 0.25%-0.35% of Cu, 0.02%-0.04% of Al, 0.020%-0.030% of Nb, 0.010%-0.020% of Ti and the balance of Fe and inevitable impurity elements. The production method comprises processes as follows: smelting, continuous casting, casting blank heating, rolling control and cooling control. With adoption of composition design and rolling control and cooling control technologies, corrosion resisting property of the steel is guaranteed, the fine and uniform ferrite+bainite+pearlite structure is obtained, and toughness and earthquake resistance of the steel are improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-strength weathering steel with a low yield ratio and a production method thereof. Background technique [0002] Corrosion of iron and steel materials has always been a worldwide problem. It not only leads to the scrapping of metal equipment and materials, but also causes major economic losses, and even brings serious social problems such as environmental pollution and casualties. [0003] Weather-resistant steel, a hot product researched and applied in today's society, is a kind of atmospheric corrosion-resistant steel. Its weather resistance is 2 to 8 times that of ordinary carbon steel, and it has obvious protection against corrosion. As a new generation of advanced steel materials, weathering steel also has the characteristics of no coating, thinning, consumption reduction, labor saving and energy saving, so it has been widely used in construction, railwa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/06C22C38/48C22C38/50C22C33/04C21D8/00
CPCC21D8/005C22C33/04C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50
Inventor 姚纪坛孙力安会龙信瑞山潘进刘红艳刘需任帅
Owner HEBEI IRON AND STEEL
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