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Acicular constituent high strength weathering resistant steel and producing method thereof

A technology of acicular structure and production method, which is applied to the non-quenched and tempered acicular high-strength weathering steel and its production field, can solve the problems of insufficient use of precipitation and dislocation interactive strengthening and structure refinement, and shorten the production time. The effect of cycle, excellent low temperature toughness, and excellent weldability

Inactive Publication Date: 2005-04-27
武汉钢铁有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The C content of this steel is 0.015%~0.035%. Although it can achieve an extremely low carbon level, the disadvantage is that the molybdenum content is ≤0.50%, the copper content is 0.20%~0.40%, and the chromium content is 0.40%~0.70%. Vanadium≤0.10%
In its production process, the steel is directly accelerated cooling after the thermomechanical controlled rolling process, and does not make full use of the effects of niobium and other precipitation and dislocation interaction strengthening and microstructure refinement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: According to the composition requirements of the steel of the present invention, the steel of the present invention was smelted on an 80-ton oxygen top-bottom double-blown converter. After RH vacuum degassing treatment, rare earth treatment was carried out, and the whole process of protective continuous casting was adopted; the steel was smelted and analyzed The main chemical composition of the steel is shown in "Invention Steel 1" in Table 1; the steel billet is austenitized at 1250°C and rolled out of the furnace, the rolling start temperature is 1180°C, and the cumulative reduction ratio is 70%, 67%, and 60%; The starting temperature of rolling is 915°C, 935°C, 947°C, the finish rolling temperature is 773°C, 806°C, 812°C respectively, the cumulative reduction rate of the last three passes is 45%; the relaxation time after rolling is 20 seconds, the relaxation Then cool to 580°C at cooling rates of 6°C / S, 8°C / S, and 10°C / S, respectively, and then air-cool...

Embodiment 2

[0034] Embodiment 2: According to the composition requirements of the steel of the present invention, the steel of the present invention was smelted on an 80-ton oxygen top-bottom double-blown converter. After RH vacuum degassing treatment, calcium treatment technology was adopted, and the whole process was protected and continuously cast; see Table 1 "Invention Steel 2"; the billet was austenitized at 1250°C and released from the furnace, the initial rolling temperature was 1200°C, and the cumulative reduction rate was 70% and 63%; the finishing rolling temperature was 945°C and 915°C respectively. ℃, the finishing temperature of finish rolling is 784℃ and 805℃ respectively, and the cumulative reduction rate of the last three passes is 48% and 41%; The cooling rate of °C / S is cooled to 650 °C, 680 °C, and air cooled to room temperature. Steel plates with thicknesses of 25.5 and 51mm were rolled.

[0035] The steel produced in Example 1 and Example 2 was tested for mechanical...

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Abstract

The present invention relates to high strength high weather resistance steel with needle structure and its production process, and belongs to the field of low alloy steel making. The present invention adopts very low carbon content to result in normal temperature dissolvability in alpha-Fe not higher than 0.0218 wt%, adds Cu, Cr, Ni, Mo, Nb, Ti, Al, Zr, RE and Ca, and ensures the main structure is needle-like structure for excellent weather resistance. The steel of the present invention is produced by means of hot rolling technology and relaxation-separation control technology and has low production cost and short production period. It has excellent weather resistance, excellent toughness, and excellent weldability needing no preheating before welding and heat treatment after welding, and may be used widely in bridge, building, traffic facility, sea platform, etc.

Description

technical field [0001] The invention relates to a high-strength weather-resistant steel with acicular structure and its production method, in particular to a non-quenched and tempered high-strength weather-resistant steel with acicular structure excellent in low-temperature toughness and welding performance and its production method, which belongs to the manufacture of low-alloy steel field. Background technique [0002] Before the present invention, the HPS 70W steel in the American Society for Testing and Materials standard ASTMA709 / A709M-01b with a similar strength level had a carbon content less than or equal to 0.11%, generally around 0.09%, and had a high welding cold crack sensitivity coefficient , so a more complex welding process is required, and at the same time, quenching and tempering heat treatment is required for thick steel plates. The steel also contains 0.04% to 0.08% vanadium. During the cooling process after welding, carbonitrides of vanadium will be prec...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/50
Inventor 郭爱民贺信莱邹德辉董汉雄陈颜堂柳志敏王学敏
Owner 武汉钢铁有限公司
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