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Q/BQB 110-2018 PDF in English


Q/BQB 110-2018 (Q/BQB110-2018, QBQB 110-2018, QBQB110-2018)
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Q/BQB 110-2018: PDF in English (QBQB 110-2018)

Q/BQB 110-2018
BQB
ENTERPRISE STANDARD OF BAOSTEEL
Replacing Q/BQB 110-2014
Rolled square blank
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 for ordering ... 6 
4 Dimension, shape, weight and tolerance ... 6 
5 Technical requirements ... 7 
6 Inspection and testing ... 9 
7 Packaging, marks and inspection documents ... 10 
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 110-2014. In comparison with
Q/BQB 110-2014, there are several main changes as follows.
- normative references were modified to the latest version applicable; deleted the
test method for chemical composition analysis;
- added the specifications of side lengths of 160mm and 215mm as well as their
technical requirements; deleted the specifications of side lengths of 90mm,
134mm;
- tightened the side length tolerance of Table 1;
- modified 5.1.1 from “the designation and chemical composition of the steel
(except for the welding rod and the steel for the welding wire are the finished
components of the square blank, the others are all smelting components) shall
meet the requirements of the corresponding Baosteel enterprise standard or
other standards” TO “the designation and chemical composition of the steel
(except for the welding rod and the steel for the welding wire are the finished
components of the square blank, the rest are smelting components) shall
comply with the corresponding Baosteel enterprise standard, GB/T 669, GB/T
1591, GB/T 3077, GB/ T 1222, GB/T 6478 or other standard regulations”;
- “Except for steel for welding rods and low carbon steel square blanks, square
blanks shall be inspected at low magnification. There shall be no visible bubbles,
white spots, cracks, tumbling, inclusions and residual shrinkage holes on the
acid immersion low-magnification test piece” was MODIFIED TO “Except for
boiling steel, square blank shall be inspected at low magnification. There shall
be no visible bubbles, white spots, cracks, tumbling, inclusions, residual craters,
metal foreign bodies on the acid immersion low-magnification test piece”;
ADDED that “the center segregation is not more than 2.5; the general spot-like
segregation is not more than 2.0; the edge speckle segregation is not more
than 2.0”;
- added requirements for non-metallic inclusions;
Rolled square blank
1 Scope
This Standard specifies the dimension, shape, weight and tolerance, technical
requirements, inspection and testing, packaging, marks and inspection documents of
primarily rolled square blanks and hot rolled square blanks.
This Standard is applicable to primarily rolled square blanks and hot rolled square
blanks for re-rolling or forging 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 222-2006, Permissible Tolerances for Chemical Composition of Steel
Products
GB/T 226-2015, Test method for macrostructure and defect of steel by etching
GB/T 699-2015, Quality carbon structural steels
GB/T 1222-2016, Spring steels
GB/T 1591, High strength low alloy structural steels
GB/T 1979-2001, STANDARD diagrams for macrostructure and defect of
structural steels
GB/T 3077-2015, Alloy structure steels
GB/T 6478-2015, Steels for cold heading and cold extruding
GB/T 10561-2005, Steel - Determination of Content of Nonmetallic Inclusions -
Micrographic Method Using Standards Diagrams
GB/T 20066-2006, Steel and Iron - Sampling and Preparation of Samples for the
Determination of Chemical Composition
3 Information for ordering
The user needs to provide the following information when ordering.
a) Reference to this enterprise;
b) Designation;
c) Specification;
d) Weight;
e) Other particular requirements.
4 Dimension, shape, weight and tolerance
4.1 Dimension and tolerance
4.1.1 The section size and tolerance of a square blank shall comply with the
requirements of Table 1.
4.1.2 A square blank with a side length of less than or equal to 140mm usually has a
length of 2000mm~19000mm. A square blank with a side length of more than or equal
to 160mm usually has a length of 2000mm~10000mm. Square blanks can also be
delivered in fixed length and multiple lengths. The length shall be within the usual
length range. The tolerance is 0 ~ +70mm.
5.6.1 The end of a square blank shall not have shrinkage cavities, airbags,
delamination and tail holes. The surface of a square blank shall be free from cracks,
crusting, inclusions, folds, cracks and ears.
5.6.2 The maximum depth of scratches, roll marks, pits, and pitting on the surface of a
square blank is. 2mm when side length≤140mm; 3mm when side length≥160mm. The
maximum depth of the surface of a square blank that is allowed to exist is. 1mm when
side length≤140mm; 2mm when side length≥160mm.
5.6.3 The surface defects of square blank are allowed to clear. The cleaning place shall
be smooth and without corners. The cleaning depth (on the same section) must not be
greater than 6% of the side length. The cleaning width shall be no less than five times
the cleaning depth.
5.7 Other particular requirements
According to the requirements of the purchaser, other items can be inspected upon
agreement between the supplier and the purchaser. The indicators shall be stipulated
by the agreement between the supplier and the purchaser.
6 Inspection and testing
6.1 Dimension and shape check
6.1.1 Use an appropriate gauge to measure the dimension and shape of square blanks
one by one.
6.1.2 Measurement of side length. use a measuring tool to measure, at a distance of
not less than 150mm from the end of the square blank, along with the vertical direction
of the square blank length. Take its maximum size as the side length value.
6.1.3 Measurement of length. the distance between the two end faces of a square
blank measured along with the square blank side centerline shall be the actual length
of the square blank.
6.2 Surface quality check
The surface quality of a square blank is checked with naked eyes.
6.3 Other inspection items
Other inspection items, sampling quantity, sampling method and test methods of a
square blank shall comply with the provisions of Table 3.
6.4 Batching rules
Square blanks shall be inspected and accepted in batches. Gland steel square blanks
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.