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Steel plate with high strength and low yield ratio

A low-yield ratio, high-strength technology, applied in the field of iron and steel materials, can solve the problems of complex chemical composition, low strength, and increased raw material costs, and achieve the effect of simple production process, low cost, and reduced production costs

Active Publication Date: 2010-03-24
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] It can be seen from Table 1 and Table 2 that the strength of the existing low-yield ratio steels is very low, and the chemical composition of the steels involved in some patent documents is relatively complex, which not only increases the cost of raw materials, but also is not suitable for the requirements Working conditions of high strength and low yield ratio

Method used

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  • Steel plate with high strength and low yield ratio
  • Steel plate with high strength and low yield ratio
  • Steel plate with high strength and low yield ratio

Examples

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Embodiment 1

[0027] According to the chemical composition shown in Table 3, the molten steel is smelted in a converter or an electric furnace, and then secondarily refined in a vacuum furnace, and cast into a billet (ingot) with a thickness of 220 mm. The billet (ingot) is heated to 1200 ° C and kept for 1 to 2 hours. Then rolling, the starting rolling temperature is 1000-1070°C, the rolling thickness is 120-220mm, the cumulative deformation above 950°C is ≥50%, the intermediate billet is heated at about 1000°C to 900°C, and the final rolling temperature is 800- 850°C, the thickness of the steel plate is 100mm, water cooling is carried out at a speed of 8-10°C / s after rolling, and the final cooling temperature is 500-550°C.

Embodiment 2

[0029] Except that the billet (ingot) heating temperature is 1200° C. and the thickness of the steel plate is 40 mm, other implementations are the same as in Example 1.

Embodiment 3-5

[0031] Except that the billet (ingot) heating temperature is 1150° C. and the thickness of the steel plate is 80 mm, other implementations are the same as in Example 1.

[0032] Table 3 Chemical composition (wt %) of the steel plate of embodiment 1-5 of the present invention

[0033]

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Abstract

The present invention provides a steel plate with high strength and low yield ratio, which comprises chemical components as follows: C: 0.15-0.20 wt%, Si: 1.0-2.0 wt%, Mn: 1.8-2.0 wt%, Al<=0.036 wt%,V: 0.05-0.1 wt%, P<=0.01 wt%, S<=0.005 wt%, Cr: 0.8-1.0 wt%, the residual is Fe and other unavoidable impurity. The hot-rolling steel plate with high strength and low yield ratio is obtained by adopting low alloyed processing and traditional TMCP rolling technique, which has a strength reaching to 1200-1500 MPa, simultaneously, has better low temperature impact toughness. The steel plate is suitable for the fields requiring high strength and low yield ratio, such as mechanical manufacture, fuel / gas delivery pipeline, building, bridge, steel rail and pressure vessel, etc.

Description

technical field [0001] The invention relates to iron and steel materials, in particular, the invention relates to a steel plate with high strength and low yield ratio. Background technique [0002] Typically, traditional carbon steel or microalloyed steel has a high yield strength / tensile strength ratio, above 0.85 or higher. For example, although some ultra-fine grain steels have high strength, due to their low work hardening ability, resulting in low uniform elongation rate, the yield strength of the material is very close to the tensile strength, that is, it has a high yield ratio, even close to 1. In some application areas subject to impact or collision, such as earthquake-resistant building structural steel, automotive steel, etc., materials are required to have a low yield ratio, so that they can absorb part of the energy before the material is completely destroyed, thereby delaying the destruction of the material time. At present, hot-rolled low-yield ratio steel m...

Claims

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Application Information

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IPC IPC(8): C22C38/38
Inventor 王巍王焕荣
Owner BAOSHAN IRON & STEEL CO LTD
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