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Method for inspecting fracture defects of reconnected billets

A billet and defect technology, applied in the application field of continuous casting billet quality inspection technology

Active Publication Date: 2014-04-23
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is mainly aimed at the surface crack defects of steel slabs, but the inspection and judgment methods for the fracture defects of rejoined steel slabs (including surface dents, crack defects, internal shrinkage cavities, delamination, and transverse crack defects) have not involved

Method used

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  • Method for inspecting fracture defects of reconnected billets
  • Method for inspecting fracture defects of reconnected billets
  • Method for inspecting fracture defects of reconnected billets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] Take two billets with thicknesses of 150mm, 250mm and 300mm respectively as an example:

[0015] production process:

[0016] Smelting time

Stoves

steel type

thickness

width

2012-9-13

2N06256A11

E36N

150

1800

2012-11-16

2N07212A11

Q235B

150

1800

2013-03-28

3Q01726B11

D36-1

250

2000

2013-01-12

3N00261B11

X65

250

1500

2013-04-03

3P02125C01

X80-300

300

2400

2013-03-31

3N02193C11

Q345D-300

300

2000

[0017] Step 1 and Step 2, process parameter reminder, visual inspection and flame cleaning:

[0018]

[0019] Step 3. Straight probe ultrasonic inspection:

[0020]

[0021] Step 4. Ultrasonic inspection with angled probe:

[0022]

[0023] Step 5. Billet judgment result and billet rolling condition, internal flaw detection quality and surface quality of the steel plate:

[0024]

[0025] In sum...

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Abstract

The invention discloses a method for inspecting fracture defects of reconnected billets and belongs to the field of continuous cast billet quality inspection technology application. Billet reconnection positions are inspected and determined by a method combining visual inspection, flame scarfing and ultrasonic inspection. Visual inspection is performed on reconnection mark surface defects and reconnection mark depth and width. Flame scarfing is to clear away the surface defects, so that gutter defects are prevented, the billet surface smoothness is improved, and the ultrasonic coupling capacity is improved. The method has the advantages that inspection of the reconnected billets is guided effectively, the decision content of the reconnected billets is reduced by 70%, the qualified reconnected billets after determination are not fractured, and the rolled steel plate quality is good.

Description

technical field [0001] The invention belongs to the technical application field of continuous casting billet quality inspection, and particularly relates to a method for inspecting fracture defects of rejoined billets. Background technique [0002] When continuous casting slabs are used to roll medium and thick steel plates, the rejoining defects of the slabs can easily cause them to break in the heating furnace, causing confusion in production and causing huge economic losses. China metallurgical industry continuous casting steel slab standard (YB / T2012-2004), the requirements for the surface quality of the steel slab are as follows: "The surface of the continuous casting slab must not have visually visible overlapping, overlapping, and turning over...". The standard does not define reconnection, nor does it clarify the morphological characteristics of reconnection defects under visual inspection, making the inspection and judgment very general and poor in operability. Amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B38/00
Inventor 魏运飞江东才朱启茂王建张会祥慕文杰李涛董景白松莲
Owner SHOUGANG CORPORATION