Titanium chromium acid pickling plate and preparing method thereof

A technology of titanium chromic acid and plate washing, which is applied in the field of iron and steel smelting, can solve the problems of deteriorating steel plate performance, difficulty in controlling the precision of boron composition, etc., and achieve the effect of eliminating the yield platform, increasing the original movable dislocation density, and the method is simple

Inactive Publication Date: 2016-06-15
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Boron is added in this patent, and it is difficult to control the accuracy of the composition of boron, and when the boron content is high, the steel plate will be brittle and deteriorate the performance of the steel plate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The above-mentioned preparation method of titanium chromium pickling plate mainly includes the following steps: billet → hot rolling → laminar cooling → coiling → pickling;

[0023] Among them, the start rolling temperature of the finish rolling in the hot rolling step is 950-1050°C, the finishing rolling temperature in the hot rolling step is 830-900°C; the coiling temperature is 540-600°C; the tensile elongation in the pickling step is 0.5-3.0%.

[0024] Further, as a more preferred technical solution, in the preparation method of the above-mentioned titanium chromium pickling plate, the starting temperature of the finish rolling in the hot rolling step is 952-1048° C., and the finishing rolling temperature in the hot rolling step is 834-1048° C. 897°C; the coiling temperature is 545-598°C; the tensile elongation in the pickling step is 0.8-2.5%.

[0025] Further, as a more preferred technical solution, in the above-mentioned method for preparing a titanium chromium ...

Embodiment 1

[0033] This example is rolled on Panzhihua Iron and Steel 2050 hot rolling mill. Its production process is: steel billet → hot rolling → laminar flow cooling → coiling → pickling, the chemical composition weight percentage of steel billet is: C: 0.01%, Si: 0.01%, Mn: 0.30%, P: 0.015%, S: 0.005%, Cr: 0.10%, Ti: 0.023%. The starting temperature of finish rolling in the hot rolling step is 950°C, the finish rolling temperature in the hot rolling step is 830°C; the temperature in the coiling step is 545°C; the tensile elongation in the pickling step is 0.9%.

[0034] The low-carbon mild steel produced by the method has mechanical properties Rel: 185MPa, Rm: 290MPa, yield strength ratio: 0.64, A%: 55%, and good surface quality.

Embodiment 2

[0036] This example is rolled on Panzhihua Iron and Steel 2050 hot rolling mill. Its production process is: steel billet → hot rolling → laminar cooling → coiling, the chemical composition weight percentage of steel billet is: C: 0.02%, Si: 0.03%, Mn: 0.18%, P: 0.013%, S: 0.004%, Cr: 0.35%, Ti: 0.012%. The starting temperature of finish rolling in the hot rolling step is 1000°C, the finish rolling temperature in the hot rolling step is 870°C; the temperature in the coiling step is 570°C; the tensile elongation in the pickling step is 1.5%.

[0037] The low-carbon mild steel produced by the method has mechanical properties Rel: 190MPa, Rm: 310MPa, yield strength ratio: 0.61, A%: 54%, and good surface quality.

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Abstract

The invention belongs to the field of steel smelting, and particularly relates to a titanium chromium acid pickling plate and a preparing method thereof. The titanium chromium acid pickling plate comprises, by weight percentage, 0.01%-0.03% of C, 0.01%-0.03% of Si, 0.14%-0.30% of Mn, 0.012%-0.015% of P, 0.003%-0.005% of S, 0.1%-0.6% of Cr, 0.012%-0.023% of Ti and the balance Fe and unavoidable impurities. The titanium chromium acid pickling plate which is excellent in performance and the production method of the titanium chromium acid pickling plate are provided; the titanium chromium acid pickling plate rolling and cooling processes and the acid pickling tension leveling process are mainly controlled, on one hand, the yield point elongation of the acid pickling plate is effectively eliminated, on the other hand, the original mobile dislocation density is increased, and therefore the defect of cross breaking of the acid pickling plate with lower yield strength is restrained; more importantly, the micro-carbon and chromium titanium alloy technological manner is adopted, and the produced acid pickling plate is lower in yield ratio and high in elongation; and the titanium chromium acid pickling plate and the preparing method have the beneficial effects that the method is simple, the production cost is low, and the molding performance and the welding performance of the product are excellent.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and in particular relates to a titanium chromium pickling plate and a preparation method thereof. Background technique [0002] The pickling plate is made of high-quality hot-rolled sheet as raw material. The pickling unit removes the oxide layer, trims the edge, and finishes. The main processes include hot-rolled raw material decoiling→laser welding→phosphorus breaking by the tension-leveling unit→turbulent pickling→rinsing→ On-line leveling→edge trimming→on-line oiling→baling→packing and storage, its surface quality and use requirements are between hot-rolled and cold-rolled sheets, and it is an ideal substitute for some hot-rolled and cold-rolled sheets. [0003] Chromium-titanium pickling plate is to add a certain amount of titanium alloy to ordinary pickling plate. The main function is to fix the C and N interstitial atoms in low carbon steel, reduce the yield ratio and increase the el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C38/18C21D8/02
CPCC22C38/02C21D8/0226C22C38/04C22C38/14C22C38/18
Inventor 李正荣汪创伟崔凯禹肖尧赵国英刘序江田维兵陈东旭
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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