CN102086495A

CN102086495A - Production method of oxide film hot-rolled strip steel with high adhesion

Info

Publication number: CN102086495A
Application number: CN 201010600473
Authority: CN
Inventors: 石发才; 李俊虎; 王育田; 付培茂
Original assignee: Shanxi Taigang Stainless Steel Co Ltd
Current assignee: Shanxi Taigang Stainless Steel Co Ltd
Priority date: 2010-12-22
Filing date: 2010-12-22
Publication date: 2011-06-08

Abstract

The invention discloses a production method of oxide film hot-rolled strip steel with high adhesion, which belongs to the technical filed of production of hot-rolled strip steels. The production method comprises process steps: smelting by using a converter, refining, continuous casting, heating of a plate blank, dephosphorizing, rough rolling, dephosphorizing, finish rolling, cooling, reeling, detecting, packaging and storing, and is characterized in that: (1) during smelting with the converter, the following components of molten steel are controlled in percentage by weight: less than or equal to 0.13 percent of C, less than or equal to 0.20 percent of Si, less than or equal to 1.20 to 1.60 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 0.015 to 0.065 percent of Nb, less than or equal to 0.03 percent of V and more than or equal to 0.015 percent of Al; (2) in a rough rolling process, heating temperature is 1,230 DEG C +/-20 DEG C, heating is required to be performed in a way that billet steel is well burned, alloy elements are dissolved, and over-burning and overheating and over large thickness of an oxide skin are avoided, and dephosphorization temperature is between 1,180 DEG C and 1,250 DEG C; (3) during finish rolling, the initial rolling temperature is between 1,030 DEG C and 1,050 DEG C, the final rolling temperature is between 890 DEG C and 910 DEG C, and the rolling speed is over 4.0 meters per second; (4) the reeling temperature is between 580 DEG C and 610 DEG C, and the reeling cooling speed is (8-20 DEG C) per second. By the method, the oxide film on the surface of the strip steel is thin and has adhesion and plasticity.

Description

Production method with high adhesive force oxide film hot rolled strip

Technical field

The invention belongs to the hot rolled strip production technical field, be specifically related to a kind of production method with high adhesive force oxide film hot rolled strip.

Background technology

At present, along with society and rapid economy development, demand to hot-rolled steel sheet is more and more, also more and more higher to its specification of quality, particularly automobile manufacture industry requires very high to plate surface quality, be will be through overpickling in the past, just carry out machine-shaping behind the ball blast, and the pickling process environmental pollution, energy consumption and personnel health have very big detrimentally affect, people were for fear of the disadvantageous effect of pickling afterwards, proposition is by adding alloying elements cr in steel, oxide components improves its sticking power cold-forming and coating sprays paint in the change surface of steel plate oxide films such as Mo, but the problem that this method is brought is the oxide thickness that cost increases and forms, structure, factor shape and skewness directly affect the size of oxide film sticking power.

Summary of the invention

The object of the invention provides a kind of new solution, can overcome the shortcoming that exists in the prior art effectively.

The present invention realizes like this, processing step comprise employing converter smelting → external refining → sheet billet continuous casting → slab heating → high-pressure water descaling → roughing unit rolling → high-pressure water descaling → finishing train is rolling → laminar flow cools off → batch → quality and service check → packing mark → warehouse-in, it is characterized in that: 1. control molten steel chemical ingredients is when converter smelting: (%) is by weight percentage: contain C≤0.13, Si≤0.20, Mn1.20～1.60, P≤0.015, S≤0.010, Nb 0.015～0.065, V≤0.03, Al 〉=0.015, also have in addition by the Cr that unavoidably brings in iron and the steel scrap, Ni, impurity components such as Cu; 2. the principles and requirements of rolling technology is " high temperature, roll soon ", Heating temperature is 1230 ℃ ± 20 ℃, and heat-up time, requirement was that steel billet is grilled thoroughly, and alloying element fully dissolves, but it is blocked up overheated, burning and oxide skin to occur, and hot rolling de-scaling temperature will guarantee at 1180 ℃～1250 ℃; 3. the finish rolling start rolling temperature is 1030 ℃～1050 ℃, and whole Zha Wendu is 890 ℃～910 ℃, and finish rolling system speed is more than the 4.0m/s; 4. coiling temperature is 580 ℃～610 ℃, batches rate of cooling and is (8 ℃～20 ℃)/s.

Advantage of the present invention and positively effect are by to the adjustment of chemical element in the steel with to the reasonable setting of rolling temperature, roll speed, it is thinner that the hot rolled strip surface film oxide is generated, and the oxide film that makes generation has high sticking power and plasticity, can reach and roll directly cold-formed and coating of back, removed operations such as rolling back pickling, ball blast from, both can avoid causing environmental pollution and increase cost.

Embodiment

Producing beam steel with Taiyuan Iron and Steel Co. is example, and its production technique is as follows:

1. during converter smelting was produced, control molten steel chemical ingredients for % by weight percentage was:

Impurity such as C:0.09, Si:0.12, Mn:1.35, P:0.012, S:0.007, Nb:0.019, Al:0.026 all the other Cr, the Ni that brings into by raw material when making steel in addition, Cu etc.

2. rougher of hot strip mill is rolling:

Continuous casting steel billet is at the walking beam furnace internal heating, and Heating temperature is 1242 ℃, require to guarantee heat-up time with slab grill thoroughly, alloying element fully dissolves, but can not burning and overheated and oxide skin generate blocked up, time is 185 minutes, and the de-scaling water pressure is 18Mpa, and the de-scaling temperature is 1190 ℃.

3. the finish rolling start rolling temperature is 1041 ℃, and finish rolling speed is 5.2m/s, and whole Zha Wendu is 904 ℃.

4. rolling the back coiling temperature is 598 ℃, and batching back coil of strip speed of cooling is 18 ℃/s.

Effect comparison is that following table 1 is listed: table 1

Above table 1 can be found out the positive effect of the inventive method.

Annotate: traditional method is the production method that needs before hot rolled strip processing is used through overpickling or ball blast.

Claims

1. the production method that has high adhesive force oxide film hot rolled strip, processing step comprise employing converter smelting → external refining → sheet billet continuous casting → slab heating → high-pressure water descaling → roughing unit rolling → high-pressure water descaling → finishing train is rolling → laminar flow cools off → batch → quality and performance checking → packing mark → warehouse-in, it is characterized in that: 1. will control the molten steel chemical ingredients when converter smelting for by weight per-cent (%) is: C≤0.13, Si≤0.20, Mn1.20 ~ 1.60, P≤0.015, S≤0.010, Nb 0.015 ~ 0.065, V≤0.03, Al 〉=0.015; 2. roughing processing requirement is " high temperature, roll soon ", Heating temperature is 1230 ℃ ± 20 ℃, require heat-up time be with steel billet grill thoroughly, alloying element will fully dissolve, but burning, overheated and oxide skin is blocked up can not occur, hot rolling de-scaling temperature is 1180 ℃ ~ 1250 ℃; 3. the finish rolling start rolling temperature is 1030 ℃ ~ 1050 ℃, and whole Zha Wendu is 890 ℃ ~ 910 ℃, and roll speed is more than the 4.0m/s; 4. coiling temperature is 580 ℃ ~ 610 ℃, batches rate of cooling and is (8 ℃ ~ 20 ℃)/s.