Air corrosion resisting high strength low alloy metal and its production process

An atmospheric corrosion-resistant steel, high-strength and low-alloy technology, applied in temperature control and other directions, can solve the problems of poor low-temperature impact toughness, and the yield strength of atmospheric corrosion-resistant steel cannot reach the level of 550MPa. Atmospheric corrosion performance, the effect of good welding performance

Active Publication Date: 2007-06-27
BAOSHAN IRON & STEEL CO LTD
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the technical problems that the yield strength of the existing atmospheric corrosion-resistant steel does not reach the 550MPa level and the low-temperature impact toughness is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0031] Embodiment 1-4: According to the composition requirements of the steel of the present invention, the steel of the present invention was smelted on a 300-ton oxygen top-bottom double-blown converter. After RH vacuum degassing treatment, calcium treatment technology was adopted, and the whole process of protective continuous casting; chemical composition Examples are shown in Table 2; billet reheating temperature is 1235°C, rough rolling start temperature is 1195°C, finish rolling start temperature is 950°C, finish rolling finish temperature is 865°C, 825°C, and then 8°C / S , Cooling rate of 11°C / S to 575°C, 550°C, air cooling to room temperature. The rolled thicknesses of the first three embodiments are 4mm, 8mm, and 16mm respectively. Examples of mechanical properties are shown in Table 3. The corrosion resistance test results are shown in Table 4.

[0032] Table 2 steel embodiment of the present invention-chemical composition

[0033] Preface

No

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Abstract

The present invention relates to high strength air corrosion resisting steel and its production process. The low alloy air corrosion resisting steel consists of C 0.05-0.10 wt%, Si not more than 0.75 wt%, Mn 1.0-1.6 wt%, P not more than 0.020 wt%, S not more than 0.010 wt%, Al 0.01-0.05 wt%, Cu 0.20-0.55 wt%, Cr 0.20-0.45 wt%, Ni 0.12-0.40 wt%, Ca 0.001-0.006 wt%, N 0.001-0.006 wt%, Nb not more than 0.07 wt%, Ti not more than 0.025 wt%, Mo not more than 0.35 wt%, and Fe and inevitable impurity for the rest. It is produced through conventional smelting and two stage rolling after being heated to over 1200 deg.c, and the rolling includes finish rolling with initial temperature of 950 deg.c, accumulated reduction degree not lower than 80 % and final temperature lower than 880 deg.c, cooling in the rate of 5-15 deg.c / s to 400-700 deg.c, coiling and air cooling to room temperature. It is used for vehicle, container, bridge, etc.

Description

Technical field: [0001] The invention relates to a high-strength atmospheric corrosion-resistant steel and a production method thereof, belonging to the field of low-alloy steel manufacturing. Background technique: [0002] Before the present invention, there have been many invention patents on atmospheric corrosion-resistant steel (weathering steel), the "Atmospheric Corrosion-Resistant Low-alloy Structural Steel (Patent No. steel (patent number: 85108118)", and "atmospheric corrosion-resistant steel (patent number: 00121262.1)" published in 2001. These patented steels are all low-alloy structural steels with certain atmospheric corrosion resistance, the composition system is Cu-P-Cr-Ni or Cr-P-Ti-RE, the yield strength is 350MPa, and the low-temperature impact performance is relatively high. Low. [0003] The patent most similar to the patent of the present invention is the Chinese patent application "Acicular Structure High-Strength Weathering Steel and Its Production M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/42B21B37/74
Inventor 李自刚温东辉屈朝霞杨阿娜
Owner BAOSHAN IRON & STEEL CO LTD
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