Q/BQB 600-2018 English PDF (QBQB600-2018)

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Q/BQB 600-2018: General technical requirements for steel plates
Q/BQB 600-2018
ENTERPRISE STANDARD OF
BAOSHAN IRON and STEEL CO., LTD.
Replacing Q/BQB 600-2013
General Technical Requirements for Steel Plates
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 Ordering Information ... 5 
4 Smelting Method ... 6 
5 State of Delivery ... 6 
6 Thermal Treatment ... 7 
7 Chemical Analysis ... 7 
8 Appearance ... 8 
9 Dimension, Appearance, Weight and Permissible Tolerance ... 9 
10 Additional Requirements ... 11 
11 Inspection and Testing ... 15 
12 Acceptance Check ... 17 
13 Rounding-off of Numerical Value ... 18 
14 Signs ... 18 
15 Inspection Documents ... 18 
16 Others ... 19 
Appendix A (normative) Weight Calculation Method and Additional Value of
Thickness for Various Thickness Precisions in Theoretical Weight ... 20 
Appendix B (informative) Steel Weldability ... 22 
Foreword
This Standard was drafted in accordance with the rules in GB/T 1.1-2009 Directives
for Standardization - Part 1: Structure and Drafting of Standards.
The formulation of this Standard takes GB/T 709-2006, EN 10029-2010 and ASTM
A6M-2017, and the practical situation of manufacture in Baoshan Iron and Steel as a
reference.
This Standard serves as a replacement of Q/BQB 600-2013 General Technical
Requirements for Steel Plates. In comparison with the previous standard, there are
several main changes as follows:
---In Normative References, the reference of GB/T 14977-2008 is added; the year
of issuance of GB/T 18253 and GB/T 2975 is added;
---The default mode of the surface state of non-heat-treated steel plate during
delivery is clarified;
---The stipulation that appearance quality may implement in accordance with GB/T
14977 through negotiation is added;
---It is clarified that quenching includes offline quenching and online quenching;
---The permissible tolerance of length that is over 10,000 mm becomes more
rigorous;
---The stipulation of permissible tolerance of unevenness of untrimmed steel plate
is added;
---The common unevenness precision tolerance of steel plate whose width is more
than 3,000 mm becomes more rigorous;
---In the rounding-off of numerical value, it is clarified that the determination of
numerical value adopts rounded-off value comparison method.
In this Standard, Appendix A is normative; Appendix B is informative.
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.
General Technical Requirements for Steel Plates
1 Scope
1.1 This Standard stipulates a group of general technical requirements for thick steel
plates. The content includes ordering information, smelting method, state of delivery,
thermal treatment, chemical analysis, surface, dimensions, appearance, weight,
additional requirements, inspection and testing, acceptance check, rounding-off of
numerical values, signs and inspection documents, etc.
1.2 This Standard is applicable to thick steel plates (hereinafter referred to as steel
plates) manufactured by Baoshan Iron and Steel Co., Ltd.
1.3 When product standards or contract stipulations are inconsistent with the
stipulations in this Standard, product standards and contract stipulations shall prevail.
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. In terms of references without a specified date, the latest version
(including all the modifications) is applicable to this Standard.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 8170 Rules of Rounding-off For Numerical Values and Expression and
Judgement of Limiting Values
GB/T 14977-2008 General Requirement for Surface Condition of Hot-rolled Steel
Plates
GB/T 18253-2000 Steel and Steel Products - Types of Inspection Documents
GB/T 2975-1998 Steel and Steel Products - Location and Preparation of Test
Pieces for Mechanical Testing
3 Ordering Information
3.1 In accordance with demands, during ordering, users need to provide the following
information that is sufficient to illustrate necessary documents:
a) Standard No. and nameplates;
b) Specifications, tolerances and weights;
c) The state of edges, the state of delivery and the state of surface;
d) Purposes, and types of inspection documents;
e) Others (such as additional requirements, requirements of weld repairs).
3.2 When the grade of thickness tolerances, the state of edges and the grade of
unevenness tolerances are not stated in the order contract, products shall be delivered
in accordance with the grade of thickness tolerances - PT.N, the state of edges - EC,
and the grade of common unevenness precision PF.N. When the state of delivery is
not stated, the supply-side shall determine. In terms of non-heat-treated steel plates,
when the surface state is not stated, products shall be delivered in the state of black
surface. When the type of inspection documents is not appointed, comply with Type
5.1 B in GB/T 18253-2000.
NOTE: the type of inspection documents: Type 5.1 B in GB/T 18253-2000 is equivalent to
Type 3.1 in EN 10204-2004.
4 Smelting Method
Steel shall be killed steel smelted through oxygen converter or electric furnace.
5 State of Delivery
5.1 Steel plates may be delivered in the state of rolling, normalized rolling, thermo-
mechanical controlled rolling and/or thermal treatment, unless it is otherwise stipulated
in product standards or contracts.
5.2 When the delivery state of steel plates is not stipulated in product standards or
contracts, the supply-side shall determine.
5.3 The classification and code of the delivery state of steel plates is shown in Table 1.
c) Before welding and repairing, adopt appropriate methods, such as evening out
or polishing to completely remove detrimental defects on steel plates. The
depth of the removed parts shall be within 20% of the nominal thickness of steel
plates. The total of a single-sided grinded area shall be within 2% of the area
of steel plates.
d) On the edges of steel plates’ welded parts, there shall be no undercuts or
overlaps. Stack height shall be more than 1.5 mm higher than the rolled surface;
then, use methods like evening out or polishing to remove the stack height.
e) In terms of heat-treated steel plates, after welding and repairing, they shall
receive thermal treatment again.
f) The welding and repairing of products whose minimum tensile strength is
stipulated to be not less than 690 MPa shall be negotiated through the demand-
side and the supply-side.
8.2.2 If the demand-side demands, through the negotiation between the demand-side
and the supply-side, and indication in the contract, surface quality may implement in
accordance with GB/T 14977. Under this circumstance, if classification or grade is not
indicated in the contract, comply with Class-B, Grade-1 requirements in GB/T 14977.
9 Dimension, Appearance, Weight and Permissible
Tolerance
9.1 Classification and Code
9.1.1 In accordance with the state of edges...