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Hot-rolled high-strength steel plate for electrostatic enamel and method for manufacturing same

A technology of high-strength steel plate and manufacturing method, applied in temperature control, manufacturing tools, heat treatment process control, etc., can solve problems such as unsuitability of double-sided wet enamel steel plate

Active Publication Date: 2008-03-12
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tests have shown that the above-mentioned double-sided wet enamelled steel plate is not suitable for electrostatic enamelling

Method used

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  • Hot-rolled high-strength steel plate for electrostatic enamel and method for manufacturing same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The main components of steel include: C: 0.05%, Si: 0.02%, Mn: 0.86%, P: 0.011%, S: 0.005%, Al: 0.039%, N: 0.004%, Ti: 0.05%, Nb: 0.030%, the balance being iron and unavoidable impurities.

[0043] The molten steel smelted according to the above ratio is subjected to vacuum degassing treatment before continuous casting, and the obtained continuous casting slab is heated at 1150°C, and then rolled in multiple passes within the austenite recrystallization temperature range, the total reduction rate is not low 50%, and then rolled into a steel plate in one or more passes within the temperature range of the austenite recrystallization zone or non-recrystallization zone, the total reduction rate is not less than 50%, and the final rolling temperature is 875°C. Then cool to the coiling temperature in two stages, the water cooling speed of the first stage is 90°C / s, the water cooling speed of the second stage is not less than 20°C / s, the overall average cooling rate is 22°C / s,...

Embodiment 2

[0046] The main components of steel include: C: 0.10%, Si: 0.04%, Mn: 0.80%, P: 0.035%, S: 0.032%, Al: 0.010%, N: 0.007%, Ti: 0.04%, Nb: 0.050%, the balance being iron and unavoidable impurities.

[0047] The implementation method is the same as in Example 1, wherein the cooling process is divided into three sections, and the thickness of the steel plate after rolling is 1.5 mm.

[0048] The metallographic structure of the steel plate of this embodiment is shown in Fig. 1(b).

Embodiment 3

[0050] The main components of steel include: C: 0.04%, Si: 0.06%, Mn: 0.85%, P: 0.011%, S: 0.035%, Al: 0.042%, N: 0.007%, Ti: 0.10%, Nb: 0.005%, the balance being iron and unavoidable impurities.

[0051] The implementation method is the same as in Example 1, wherein the thickness of the steel plate after rolling is 2.5 mm.

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Abstract

The invention provides a hot-rolled high-strength steel sheet for static enameling and a manufacturing method for the steel sheet. The main components by weight of the steel sheet are: C: 0.02-0.1%, Si<=0.1%, Mn: 0.2-1.5%, P: <=0.035%, S<=0.035%, Al: 0.01-0.1%, N: 0.001-0.01%, Ti: 0.01-0.1 %, Nb: 0.001-0.1%, and the remainder are iron and unavoidable foreign matters. The structure of the steel sheet comprises ferrite and pearlite, an the average particle diameter of the ferrite is not more than 11 micrometer. The manufacturing method of the steel sheet is, rolling twice the continuously cast or steel blanks after heating to 1100-1250 DEG C with total pressure-down amount <=50%, and final rolling temperature >=800 DEG C, then cooling section by section to coiling temperature 550-700 DEG C, and finally leveling the sheet. The hot-rolled high-strength steel sheet is applicable for pressure vessels such as bladders of water heaters, liquid-storing tanks and water buckets, etc. that are manufactured by static enameling process, is of high strength and good plasticity, high resistance to scaling bursting and air tightness.

Description

technical field [0001] The invention relates to a hot-rolled high-strength steel plate, in particular to a hot-rolled high-strength steel plate for electrostatic enamel and a manufacturing method thereof. Background technique [0002] The enamel liner of the water heater is usually made of hot-rolled high-strength steel plate. In order to improve the strength and scale resistance of the steel plate, the method of increasing the content of manganese and titanium in low-carbon steel is mainly adopted, and boron or rare earth elements are also added. Among them, manganese mainly plays a strengthening role, and the combination of titanium and carbon, nitrogen and sulfur to form a compound not only plays a strengthening role but also can improve the anti-scale explosion performance of steel, and the supplementary addition of boron or rare earth can also improve the anti-scale explosion performance. the goal of. At present, there are many related patents and patent applications. ...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C33/04C21D8/02C21D11/00B21B37/74
Inventor 孙全社郑建忠陈锐红王骏飞梅冰陶素勤顾卫伟
Owner BAOSHAN IRON & STEEL CO LTD
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