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Hot-rolling double-phase weather-resistant steel plate and mfg. method thereof

A weathering and steel plate technology, applied in the direction of temperature control, etc., can solve the problems of increasing the production cost of dual-phase steel and increasing the production process.

Inactive Publication Date: 2008-10-01
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the production of dual-phase steel by heat treatment requires reheating the steel plate, it not only increases the production process, but also needs to configure advanced continuous furnaces, thus increasing the production cost of dual-phase steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The implementation process is carried out on the continuous casting and rolling production line, and the alloy composition is: C: 0.11%; Mn: 0.50%; Si: 0.49%; S: 0.015%; P: 0.098%; Cr: 0.60%; Ni: 0.20%; Cu: 0.27%; Mo: 0.42%. Firstly, the slab is cast on a continuous casting machine and heated to 1150°C in a roller hearth furnace; then two passes of rough rolling are carried out, followed by five passes of finish rolling, the final rolling temperature is 880°C; the cooling rate after final rolling is 25 °C / s, and finally coiling, the coiling temperature is 600 °C.

[0034] The properties of the obtained hot-rolled dual-phase weathering steel plate are as follows: tensile strength 780MPa, yield strength 420MPa, elongation 28%, work hardening index n value 0.21, yield strength ratio 0.54, no discontinuous yield phenomenon, tensile strength of welding heat affected zone 630MPa; the salt spray test results show that the corrosion rate of the hot-rolled dual-phase weathering...

Embodiment 2

[0036] The implementation process is carried out on the continuous casting and rolling production line, and the alloy composition is: C: 0.11%; Mn: 0.50%; Si: 0.49%; S: 0.015%; P: 0.098%; Cr: 0.60%; Ni: 0.20%; Cu: 0.27%; Mo: 0.42%. Firstly, the slab is cast on a continuous casting machine and heated to 1150°C in a roller hearth furnace; then two passes of rough rolling are carried out, followed by five passes of finish rolling, with the final rolling temperature at 860°C; the cooling rate after final rolling is 26 °C / s, and finally coiling, the coiling temperature is 580 °C.

[0037] The properties of the obtained hot-rolled dual-phase weathering steel plate are as follows: tensile strength 750MPa, yield strength 415MPa, elongation 26%, work hardening index n value 0.21, yield strength ratio 0.55, no discontinuous yield phenomenon; salt spray test results show that heat The corrosion rate of the rolled dual-phase weathering steel is 1.26mm / a (period is 120h), and the weatheri...

Embodiment 3

[0039]The implementation process is carried out on the continuous casting and rolling production line, and the alloy composition is: C: 0.09%; Mn: 0.54%; Si: 0.51%; S: 0.012%; P: 0.094%; Cr: 0.55%; Ni: 0.21%; Cu: 0.29%; Mo: 0.44%; Nb: 0.035%; V: 0.03%. First, the slab is cast on a continuous casting machine and heated to 1200°C in a roller hearth furnace; then two passes of rough rolling are carried out, followed by five passes of finish rolling, with the final rolling temperature at 880°C; the cooling rate after final rolling is 26 °C / s, and finally coiling, the coiling temperature is 600 °C.

[0040] The properties of the obtained hot-rolled dual-phase weathering steel plate are as follows: tensile strength 770MPa, yield strength 420MPa, elongation 28%, work hardening index n value 0.22, yield strength ratio 0.545, no discontinuous yield phenomenon; salt spray test results show that heat The corrosion rate of the rolled dual-phase weathering steel is 1.31mm / a (period is 120...

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Abstract

A hot-rolled dual-phase steel plate with high mechanical performance, cold processibility, weldability and weatherability contains proportionally Fe, C, P and Cu, and is prepared through heating raw plate to 1100-1250 deg.C, hot rolling, cooling to 400-650 deg.C, and winding or fast cooling. Its structure is composed of ferrite and martensite.

Description

technical field [0001] The invention relates to a metal material with good mechanical properties, cold forming properties, welding properties and weather resistance properties and its manufacturing technology, especially to a metal material with low yield strength, high tensile strength, no discontinuous yield phenomenon, high work hardening index, The uniform deformation elongation and total elongation are large, the comprehensive mechanical properties and weldability are good, and at the same time, it has high weather resistance, and can be hot-rolled to produce a weather-resistant steel plate with a dual-phase structure and a manufacturing method thereof. Background technique [0002] Weathering steel is a kind of atmospheric corrosion-resistant steel. As far as its composition is concerned, it is a low-carbon low-alloy high-strength steel. Because it contains alloy elements such as Cu and P, it has excellent atmospheric corrosion resistance, that is, weather resistance. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C22C38/44B21B37/74
Inventor 廖波张春玲蔡大勇樊云昌赵田臣
Owner YANSHAN UNIV
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