Acicular constituent high strength weathering resistant steel and producing method thereof

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

Inactive Publication Date: 2007-06-27
武汉钢铁有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steel C0.015% ~ 0.035%, although it can also achieve an extremely low carbon level, the disadvantage is that its composition design stipulates 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] Example 1: According to the steel composition requirements of the present invention, the steel of the present invention is smelted on an 80-ton oxygen top-bottom combined blowing converter. After RH vacuum degassing treatment, rare earth treatment is carried out, and the whole process protective continuous casting is adopted; smelting analysis steel The main chemical composition of the steel is shown in "Invention Steel 1" in Table 1. The billet is austenitized at 1250°C and then tapped out, the rolling temperature is 1180°C, and the cumulative reduction rate is 70%, 67%, 60%; finish rolling The start-rolling temperatures are 915°C, 935°C, and 947°C, and the finishing rolling temperatures are 773°C, 806°C, and 812°C, respectively. The cumulative reduction rate of the last three passes is 45%; the relaxation time after rolling is 20 seconds. Then, it was cooled to 580°C at a cooling rate of 6°C / S, 8°C / S, and 10°C / S, and then the steel plate was air-cooled to room temperature...

Embodiment 2

[0035] Example 2: According to the steel composition requirements of the present invention, the steel of the present invention is smelted on an 80-ton oxygen top-bottom combined blowing converter. After RH vacuum degassing treatment, calcium treatment technology is used, and the whole process is protected and continuous casting; see chemical composition Table 1 "Invention Steel 2"; the billet is released after austenitizing at 1250°C, the bloom opening temperature is 1200°C, the cumulative reduction rate is 70%, 63%; the finishing rolling opening temperature is 945°C, 915 ℃, the finishing temperature of finishing rolling is 784℃ and 805℃ respectively, and the cumulative reduction rate of the last three passes is 48% and 41%; the relaxation time after rolling is 35 seconds and 100 seconds, and the relaxation time is 5℃ / S, 9 ℃ / S cooling rate cooling to 650℃, 680℃, air cooling to room temperature. Rolled steel plates with thicknesses of 25.5 and 51mm respectively.

[0036] The steel ...

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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 an acicular structure high-strength weathering steel and a production method thereof, in particular to a non-quenched and tempered acicular structure high-strength weathering steel with excellent low-temperature toughness and welding performance and a production method thereof, belonging to low alloy steel production field. Background technique [0002] Prior to the present invention, the HPS 70W steel in ASTM A709 / A709M-01b, which has similar strength levels, has a carbon content of less than or equal to 0.11%, generally around 0.09%, and a relatively high welding cold crack sensitivity coefficient Therefore, a more complicated welding process is required, and the thick steel plate needs to be quenched and tempered. The steel also contains 0.04% to 0.08% vanadium. During the cooling process after welding, vanadium carbonitride compounds will be precipitated, which will affect the welding toughness of the steel. There is also a pate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50C22C33/04
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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