Q/BQB 151-2018 English PDF (QBQB151-2018)

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Q/BQB 151-2018: Continuous casting round billet
Q/BQB 151-2018
BQB
ENTERPRISE STANDARD OF
BAOSHAN IRON and STEEL CO., LTD.
Replacing Q/BQB 151-2014
Continuous Casting Round Billet
连铸圆坯
ISSUED ON. JANUARY 15, 2018
IMPLEMENTED ON. APRIL 10, 2018
Issued by. Baoshan Iron and Steel Co., Ltd.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Information Needed for Ordering ... 5 
4 Dimension, Appearance, Weight and Allowable Deviation ... 6 
5 Technical Requirements ... 7 
6 Test and Inspection ... 8 
7 Packaging, Marking and Inspection Documents (quality certificate) ... 9 
Foreword
This Standard is drafted in accordance with the requirements and format of GB/T 1.1-
2009 Directives for Standardization - Part 1. Structure and Drafting of Standards.
This Standard is drafted in accordance with the characteristics of products and
techniques of this enterprise.
Please be noted that certain content in this Standard might involve patents. The issuing
institution of this Standard does not undertake the responsibility of identifying these
patents.
This Standard serves as a replacement of Q/BQB 151-2014. In comparison with
Q/BQB 151-2014, there are several main changes as follows.
---Normative reference is modified into the newest applicable version; chemical
composition analysis and test method is deleted;
---The technical requirements of 300 mm and 380 mm specification of round billet
are added;
---Length and allowable deviation. “through the negotiation between the demand
side and the supply side, a certain ratio of short ruler billet can be delivered” is
further clarified into “through the negotiation between the demand side and the
supply side, a certain ratio of short ruler billet that is not shorter than 4.5 m can
be delivered”;
---The requirement of appearance quality becomes more rigorous and refined;
detailed stipulations regarding defect cleaning depth and shape are newly
added;
---Chemical composition analysis and test method in Table 3 in GB/T 223 is
modified into “in accordance with the analysis method that is stipulated in
relevant product standard”;
---The requirement of inspection documents (quality certificate) is refined.
This Standard was proposed by the Manufacturing Management Department of
Baoshan Iron and Steel Co., Ltd.
This Standard shall be under the jurisdiction of the Manufacturing Management
Department of Baoshan Iron and Steel Co., Ltd.
This Standard was drafted by the Manufacturing Management Department of Baoshan
Iron and Steel Co., Ltd.
The main drafter of this Standard. Xuqing.
Continuous Casting Round Billet
1 Scope
This Standard specifies the dimension, appearance, weight, allowable deviation,
technical requirements, inspection and test, packaging, marking and inspection
documents of continuous casting round billet.
This Standard is applicable to continuous casting round billet of superior carbon
structural steel and alloy steel that are manufactured by Baoshan Iron and Steel Co., Ltd.
2 Normative References
The following documents are indispensable to the application of this Standard. In terms
of references with a specified date, only versions with a specified date are applicable
to this Standard. The latest version (including all the modifications) of references
without a specified date is also applicable to this Standard.
GB/T 226-2015 Test Method for Macrostructure and Defect of Steel by Etching
GB/T 2101-2017 General Requirement of Acceptance, Packaging, Marking and
Certification for Section Steel
GB/T 20066-2006 Steel and Iron - Sampling and Preparation of Samples for the
Determination of Chemical Composition
3 Information Needed for Ordering
During ordering, users need to provide the following information.
a) Standard number of this enterprise;
b) Nameplate;
c) Specification;
d) Weight;
e) Other special requirements.
than 2.5 mm/m; the total curvature shall be not more than 0.25% of the total length.
The partial curvature of the remaining specifications of round billet shall be not more
than 4 mm/m; the total curvature shall be not more than 0.4% of the total length.
4.3.2 Out-of-roundness
Out-of-roundness of 300 mm and 380 mm specification of round billet shall be not more
than 1.8% of the nominal diameter.
Out-of-roundness of other specifications of round billet shall be not more than 85% of
the diameter tolerance.
NOTE. the formula of calculating out-of-roundness is. “out-of-roundness=Dmax - Dmin”; Dmax
and Dmin respectively represent the maximum value and minimum value of the
same cross-sectional diameter of the practically measured round billet. In the
measurement of out-of-roundness, flat zone of round billet is also included. In
other words, the measurement result will not eliminate the factor of flat zone.
4.3.3 End face oblique
The end face of  150 mm,  178 mm and  195 mm specification of round billet shall
be vertical to the axis; the oblique shall be not more than 6 mm.
The end face oblique of  300 mm and  380 mm specification of round billet shall be
not more than 3°; the maximum value shall not exceed 10 mm.
4.4 Weight
Round billet shall be delivered in accordance with its practical weight. Through the
negotiation between the demand side and the supply side, and it shall be indicated in
the contract, round billet can also be delivered in accordance with its theoretical weight.
5 Technical Requirements
5.1 Nameplate and Chemical Composition
The nameplate and chemical composition (smelting analysis) of steel shall comply with
the stipulation in corresponding standards of Baoshan Iron and Steel Co., Ltd. and
other standards.
5.2 Smelting Method
Steel shall be smelted through electric furnace. In accordance with the technical
requirements of different steel grades, corresponding external refining techniques shall
be adopted.
5.3 Delivery State