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Macroscopic sampling method of microalloying high-strength steel slabs for cars

A micro-alloying, high-strength technology applied in the field of metal materials to reduce cost losses

Inactive Publication Date: 2017-11-03
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-magnification inspection found that: the slab has relatively serious internal quality problems, the center porosity is above 3.0, and the middle cracks and triangular cracks are all above 3.0; There were no corresponding serious problems with the internal quality of the hot plate

Method used

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  • Macroscopic sampling method of microalloying high-strength steel slabs for cars
  • Macroscopic sampling method of microalloying high-strength steel slabs for cars

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Embodiment 1

[0015] A method for low-magnification sampling of micro-alloyed high-strength automotive steel slabs, specifically:

[0016] First, the billet is cut off-line in a cold state, and then processed by a milling machine. The thickness of the milling machine is controlled to be greater than 35mm and the roughness of the inspection surface is less than 1.6μm.

[0017] figure 1 It is a trend diagram of the expansion of niobium-titanium (Ti+Nb about 0.15%) microalloyed high-strength automotive steel with temperature. It can be seen from the figure that the temperature Tb is the transformation start temperature; Tc is the transformation end temperature, and the temperature is at Steel is prone to cracks in this range.

[0018] After comparing and analyzing the low-magnification sample sampling inspection of two continuous casting slabs, the low-magnification rating results are shown in Table 1; the low-magnification photos are as follows: figure 2 and image 3 shown.

[0019] Tabl...

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Abstract

The invention provides a macroscopic sampling method of microalloying high-strength steel slabs for cars. The method includes: subjecting a steel slab to offline cold-state flame cutting, using a milling machine for machining, controlling the machining thickness of the milling machine to be larger than 35mm and test face roughness to be smaller than 1.6 micrometers, and performing a hot pickling macroscopic test. Compared with the prior art, the method has the advantages that problems such as severe internal cracks and central loosening which occur in original sampling tests do not occur in steel slab macroscopic grading; by the sampling test method, cost loss caused by sampling is reduced while sampling and test costs are reduced; meanwhile, the method has an important value to the researches and analysis of the internal texture of microalloying high-strength girder steel slabs for the cars, continuous casting process optimization and researches for analyzing the relation between S650MM casting state quality and rolled metal quality.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a low-magnification sampling method for micro-alloyed high-strength automotive steel slabs, which is mainly used for internal quality inspection and quality rating of steelmaking and continuous casting slabs. Background technique [0002] The microalloying of steel is a high-tech in the field of materials and metallurgy. It is to add trace amounts of carbides such as niobium (Nb), vanadium (V), titanium (Ti) and boron (B) to C-Mn steel, Alloying with nitride forming elements. And by degassing, desulfurizing and controlling the shape of inclusions in the molten steel during the steelmaking and smelting process, the controlled rolling / controlled cooling process is adopted in the hot rolling process, so as to control the grain size and fineness of the refined steel. Physical metallurgical process of carbide and nitride precipitation strengthening. [0003] At present, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/04G01N1/28
CPCG01N1/04G01N1/28
Inventor 程锁平张乔英杨克枝尹国才
Owner MAANSHAN IRON & STEEL CO LTD
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