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YB/T 2011-2004 (YB/T2011-2004)

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YB/T 2011-2004: PDF in English (YBT 2011-2004)
YB/T 2011-2004
GB
INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.70
H 43
Replacing YB/T 2011-1983 and YB/T 154-1999
Continuous Casting Square and Rectangular
Blank
ISSUED ON. JUNE 17, 2004
IMPLEMENTED ON. NOVEMBER 1, 2004
Issued by. National Development and Reform Commission of the
People's Republic of China
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Definitions ... 4 
4 Order Contents ... 5 
5 Size, Shape, Weight and Permissible Deviation ... 5 
6 Technical Requirements ... 7 
7 Test Methods ... 9 
8 Inspection Rules ... 9 
9 Transportation, Storage, Marking and Quality Certificate ... 10 
Foreword
This Standard revises and combines "Continuous Casting Square and Rectangular
Blank" (YB/T 2011-1983) and "Continuous Casting Square and Rectangular Blank of
Quality Carbon Structure Steels and Alloy Steels" (YB/T 154-1999).
This Standard replaces "Continuous Casting Square and Rectangular Blank" (YB/T
2011-1983) and "Continuous Casting Square and Rectangular Blank of Quality
Carbon Structure Steels and Alloy Steels" (YB/T 154-1999).
Compared with YB/T 2011-1983 and YB/T 154-1999, this Standard has the following
main changes.
- Steel classification in application scope is in accordance with GB/T 13304-1991;
- Chapter 3 "order contents" was added;
- The side length of continuous casting square and rectangular blank was
expanded to 380 mm;
- Table 2 "Figure of Continuous Casting Square and Rectangular Blank Shape"
was added;
- The permissible deviation of oblique cutting was adjusted;
- The specification of weight was added;
- The specification of Furnace No. division was cancelled;
- Casting content was adjusted;
- Surface quality content was modified and adjusted.
This Standard was proposed by China Iron and Steel Association.
This Standard is under the jurisdiction of China Steel Standardization Technical
Committee.
Drafting organizations of this Standard. China Metallurgical Information and
Standardization Institute, Capital Iron and Steel Company, Baoshan Iron & Steel Co.,
Ltd., Chongqing Special Steel Co., Ltd.
Chief drafting staffs of this Standard. Liu Zeyan, Zhang Bingcheng, Wangliping, Li
Yuguang, Feng Chao, Yang Xinliang and Liu Baoshi.
The previous editions replaced by this Standard are as follows.
- YB/T 154-1999 and YB/T 2011-1983.
Continuous Casting Square and Rectangular
Blank
1 Scope
This Standard specifies the definition, order contents, size, shape, weight, permissible
deviation, technical requirements, test methods, inspection rules, transportation,
storage, marking and quality certificate of continuous casting square and rectangular
blank (hereinafter referred to as continuous casting blank) of non-alloy steel, low alloy
steel, and alloy steel.
This Standard is applicable to continuous casting square and rectangular blank of
non-alloy steel, low alloy steel and alloy steel (tool steel excluded) classified in
accordance with Part 2 of GB/T 13304-1991.
2 Normative References
The following standards contain provisions which, through reference in this Standard,
constitute provisions of this Standard. For dated reference, subsequent amendments
to (excluding correction to), or revisions of, any of these publications do not apply.
However, the parties to agreements based on this Standard are encouraged to
investigate the possibility of applying the most recent editions of the standards. For
undated references, the latest edition of the normative document referred to applies
GB/T 222 Method of Sampling Steel for Determination of Chemical Composition
and Permissible Variations for Product Analysis
GB/T 226 Pickle Test Methods of Macro-structure and Imperfection of Steel
GB/T 2101 General Requirement of Acceptance Packaging, Marking and
Certification for Section Steel
GB/T 13304-1991 Steel Classification
YB/T 153 Standard Diagrams for Macrostructure and Defect in Quality Carbon
Structural Steel and Alloy Structural Steel Continuous Casting Blank
3 Definitions
For the purpose of this Standard, the following terms and definitions apply.
3.1 Continuous Casting Square Blank
Continuous casting blank shall be poured by molten steel of the same trademark. If
molten steel of different trademarks are adopted, the intermediate blank shall be
judged according to actual constituents.
6.3 Cropping and End Cropping Quantity
The head of newly-poured continuous casting blank and the end at the end of pouring
shall be provided with enough cropping length so as to ensure that the continuous
casting blank is free from shrinkage cavity.
6.4 Macrostructure
For continuous casting blank of high-quality non-alloy steel, special-quality non-alloy
steel and alloy steel, its macrostructure evaluation shall comply with YB/T 153. The
qualification grade shall be determined through negotiation between the Supplier and
the Purchaser. If the Supplier can guarantee the qualified macrostructure, inspection
may not be conducted.
6.5 Surface Quality
6.5.1 The surface of continuous casting blank shall be free from any observable,
halved joint, skull patch, scab and inclusion.
6.5.2 Common-quality non-alloy steel and low alloy steel shall be free from any
cracks whose depth is greater than 2mm; high-quality non-alloy steel and
special-quality non-alloy steel and alloy steel shall be free from any cracks whose
depth is greater than 1mm.
6.5.3 Common-quality non-alloy steel and low alloy steel shall be free from scratch,
indentation, air hole, wrinkle, cold splash, bump, concave and horizontal chatter mark
whose depth or height is greater than 3mm.
6.5.4 High-quality non-alloy steel and special-quality non-alloy steel and alloy steel
shall be free from scratch, indentation, air hole, wrinkle, cold splash, bump, concave
and horizontal chatter mark whose depth or height is greater than 2mm.
6.5.5 Cross-section of continuous casting blank shall be free from any shrinkage
cavity, subsurface bubble and cracks which affect the normal use.
6.5.6 Any above-mentioned defects or the defects beyond the specification on the
surface of continuous casting blank shall be removed. The removal width shall be no
less than 6 times of the depth and the length shall be no less than 10 times of the
depth. The defective position shall be round and smooth and free from corner angle
after renovation. The renovation depth on single side shall be no greater than 8% of
the side length of continuous casting blank; the sum of removal depth on opposite
sides shall be no greater than 12% of the thickness. The removal depth shall be
counted from actual size.
blank length. The measuring positions shall beyond the shear deformation and
defective area.
8.3.2 Length
It refers to the length from the center line of the side of continuous casting blank to the
both ends.
8.3.3 Bulging
It refers to the difference between the maximum side length (long side or short side)
and the minimum actual side length (long side or short side) at the bulging on the
same section of the continuous casting blank.
8.3.4 Re-inspection rules
Re-inspection of continuous casting blank shall comply with those specified in GB/T
2101.
9 Transportation, Storage, Marking and Quality Certificate
9.1 Where the Purchaser has special requirements for transportation and storage, it
shall be specified through negotiation between the Supplier and the Purchaser.
9.2 Each continuous casting blank shall be marked with trademark and Furnace No.
at the end or on the side near the end.
9.3 The quality certificate shall be in accordance with those specified in GB/T 2101.
......
 
(Above excerpt was released on 2015-09-05, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/YBT2011-2004