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YB/T 153-2015 English PDF (YBT153-2015)

YB/T 153-2015 English PDF (YBT153-2015)

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YB/T 153-2015: Standard diagrams for macrostructure and defects in high quality structural steel continuous casting blank

This standard specifies morphology features, causes, rating principles, assessment methods and test reports of macrostructure-defects in high quality structural steel continuous casting blank. This standard applies to the assessment of cross-section acid etching macrostructure defects in high-quality carbon structural steel, alloy structural steel and spring steel continuous casting blank. Negotiated by both parties of supply-demand, it can also be used to evaluate other steel continuous casting blank.
YB/T 153-2015
YB
BLACK METALLURGICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.99
H 24
Replacing YB/T 153-1999
Standard diagrams for macrostructure and defects
in high quality structural steel continuous casting blank
ISSUED ON. APRIL 30, 2015
IMPLEMENTED ON. OCTOBER 1, 2015
Issued by. Ministry of Industry and Information Technology of the
People's Republic of China
3. No action is required - Full-copy of this standard will be automatically and immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Classification and assessment ... 4
4 Test report ... 9
Appendix A (Normative) Assessment diagrams for macrostructure-defects in continuous casting blank or rectangular blank with the side length ≥100mm ~ 300mm ... 11
Appendix B (Normative) Assessment diagrams for macrostructure-defects in continuous casting blank or rectangular blank with the side length >300mm ~ 550mm ... 32
Appendix C (Normative) Assessment diagrams for macrostructure-defects in continuous casting blank with the diameter ≥90mm ~ 350mm ... 71
Appendix D (Normative) Assessment diagrams for macrostructure-defects in continuous casting blank with the diameter >350mm ~ 1000mm... 85
Standard diagrams for macrostructure and defects
in high quality structural steel continuous casting blank
1 Scope
This standard specifies morphology features, causes, rating principles, assessment methods and test reports of macrostructure-defects in high
quality structural steel continuous casting blank. This standard applies to the assessment of cross-section acid etching macrostructure defects in
high-quality carbon structural steel, alloy structural steel and spring steel continuous casting blank. Negotiated by both parties of supply-demand, it can also be used to evaluate other steel continuous casting blank.
The size range of continuous casting blank applying to this standard includes. continuous casting blank or rectangular blank with side length 100mm ~
550mm, continuous casting round blank with diameter 90mm ~ 1000mm
(hereinafter referred to as continuous casting blank). Continuous casting blanks with other size can refer to this standard.
2 Normative references
The following documents for the application of this document are essential. For dated references, only those dated references apply to this document. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 226 Etch test for macrostructure and defect of steels
YB/T 4149-2006 Continuously cast round billet for seamless steel tube
rolling
3 Classification and assessment
3.1 Sample display method
Sample’s cutting and display is carried out according to the provisions of GB/T 226.
3.2 Various types of morphology features, causes and assessment
Morphology features. Clumps or particles of different colors and shapes are presented on the acid etching sample.
Causes. Tundish low liquid level pouring generates vortex to inhale slag into crystallizer, which is failed to float up and separate. Or because the liquid level fluctuation in the crystallizer is too large, the slag involving in the steel-liquid before coagulation cannot float up to form center slag. The slag near the surface of continuous casting blank is subcutaneous slag.
Record the size, the digit and the position of slag inclusion during the assessment.
3.2.4.9 Foreign impurity metal
Morphology features. The metal block of no certain shape presents different color and matrix on acid etching sample. Some have obvious boundaries with matrix, and some have no obvious boundaries.
Causes. because the added alloy materials or the plunged dissimilar metals are not completely melted before pouring.
During the assessment, record the size and the location of foreign impurity metal, and use microscopic examination to identify.
3.2.4.10 Skull patch
Morphology features. On acid etching sample, some present white curved
bands with pores or inclusions on or around them; some present irregular dark lines; others are bands composed of dense holes and inclusions.
Causes. In pouring process, the liquid level fluctuation in the crystallizer is too large, or the insertion of nozzle is shallow, or the inclination is not appropriate, etc. So, the liquid oxide-film is rolled in the steel-liquid and fails to float up before solidification.
During the assessment, record the length and the position of skull patch. 3.3 Rating picture
3.3.1 According to the size of continuous casting blank rating, the pictures are divided into four categories; macro defects are generally divided into four grades; and unrated defects only list out the typical pictures.
3.3.2 Appendix A applies to the continuous casting blank with the side length between no less than 100mm and no more than 300mm, or the rectangular
blank with the sectional area of no more than 90000mm2.
Appendix C
(Normative)
Assessment diagrams for macrostructure-defects in continuous casting
blank with the diameter ≥90mm ~ 350mm
C.1 Center porosity (see Figure C.1)
C.2 Shrinkage (see Figure C.2)
C.3 Center cracks (see Figure C.3)
C.4 Middle cracks (see Figure C.4)
C.5 Subcutaneous crack (see Figure C.5)
C.6 Subcutaneous bubbles (see Figure C.6)
C.7 Foreign impurity metal (see Figure C.7)
C.8 Skull patch (see Figure C.8)
Appendix D
(Normative)
Assessment diagrams for macrostructure-defects in continuous casting
blank with the diameter >350mm ~ 1000mm
D.1 Center porosity (see Figure D.1)
D.2 Center segregation (see Figure D.2)
D.3 Shrinkage (see Figure D.3)
D.4 Subcutaneous crack (see Figure D.4)
D.5 Middle cracks (see Figure D.5)
D.6 Center cracks (see Figure D.6)
D.7 Subcutaneous crack (see Figure D.7)
D.8 Non-metallic inclusions (see Figure D.8)
D.9 Skull patch (see Figure D.9)
D.10 White band (see Figure D.10)

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