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Q/BQB 303-2014

Chinese Standard: 'Q/BQB 303-2014'
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Detail Information of Q/BQB 303-2014; Q/BQB303-2014
Description (Translated English): Continuously hot-rolled steel sheet and strip for general structure
Sector / Industry: Chinese Industry Standard
Word Count Estimation: 14,197
Drafting Organization: BaoSteel Group
Administrative Organization: BaoSteel Group

Q/BQB 303-2014
ENTERPRISE STANDARD OF
BAOSTEEL GROUP CORPORATION
Replacing Q/BQB 303-2009
Continuously hot-rolled steel sheet and strip for
general structure
一般结构用热连轧钢板及钢带
ISSUED ON. MAY 5, 2014
IMPLEMENTED ON. SEPTEMBER 1, 2014
Issued by. Baosteel Group Corporation
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Classification and code ... 6 
4 Order required information ... 7 
5 Size, shape, weight and tolerance ... 8 
6 Technical requirements ... 8 
7 Inspection and test ... 18 
8 Packaging, marks and inspection documents ... 20 
9 Rounding rules ... 20 
10 Annex ... 20 
Annex A ... 21 
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009
Directives for standardization - Part 1. Structure and drafting of standards.
This Standard referred to JIS G 3101-2010, JIS G 3106-2008, JIS G 3132-2011,
EN 10025-2.2004, EN 10113-2.1993, DIN 17100-80 and combined with the
actual conditions of BaoSteel to formulate.
This Standard replaces Q/BQB 303-2009.
Compared with Q/BQB 303-2009, the main changes in this Standard are as
follows.
- modified the standard name to “Continuously hot-rolled steel sheet and
strip for general structure”;
- synchronously modified the “Scope” of this Standard with the change of
standard name, and deleted “part used for mechanical structure after
further processing and heat treatment”;
- updated the versions of normative references;
- deleted the designations in the brackets in Table 1, Table 3;
- modified “structure used” in the “category” of Table 1 to “general structure
used”;
- expanded SM400A, SM400B, SM490A nominal thickness of which the
upper limit was expanded to 20 mm;
- deleted C22, C35, S20C, S35C, S45C designations used for mechanical
structure and technical requirements; and added the content into Q/BQB
360-2014;
- deleted C22, C35, S20C, S35C and S45C recommended heat treatment
system, the comparison table of similar designations with relevant
standards in the annex;
- made other editorial modifications.
This Standard was proposed by Manufacturing Management Department of
BaoSteel Group Corporation.
This Standard shall be under the jurisdiction of Manufacturing Management
Department of BaoSteel Group Corporation.
Continuously hot-rolled steel sheet and strip for
general structure
1 Scope
This Standard specifies the size, shape, technical requirements, testing and
inspection, packaging, marks and inspection documents, etc. of continuously
hot-rolled steel sheet and strip for general structure.
This Standard is applicable to the continuously hot-rolled steel sheet and strip
for general structure manufactured by BaoSteel Group Corporation as well as
cross-cutting steel plate and longitudinal cutting strip thereby (hereinafter
referred to as steel plate and steel). The products are mainly used for structural
parts in construction, bridges, ships, vehicles, etc.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 222-2006 Permissible Tolerances for Chemical Composition of Steel
Products
GB/T 223 Methods for Chemical Analysis of Iron, Steel and Alloy
GB/T 228.1-2010 Metallic materials - Tensile testing - Part 1 . Method of
test at room temperature
GB/T 229-2007 Metallic Materials - Charpy Pendulum Impact Test Method
GB/T 232-2010 Metallic materials - Bend test
GB/T 2975-1998 Steel and Steel Products - Location and Preparation of
Test Pieces for Mechanical Testing
GB/T 4336-2002 Standard Test Method for Spark Discharge Atomic
Emission Spectrometric Analysis of Carbon and Low-Alloy Steel (Routine
Method)
GB/T 4340.1-2009 Metallic materials - Vickers hardness test - Part 1. Test
method
GB/T 8170-2008 Rules of rounding off for numerical values & expression
and judgement of limiting values
GB/T 20066-2006 Steel and Iron-Sampling and Preparation of Samples for
the Determination of Chemical Composition
GB/T 20123-2006 Steel and iron - Determination of total carbon and sulfur
content Infrared absorption method after combustion in an induction furnace
(routine method)
Q/BQB 300 General rules for the packaging, marks and inspection
documents of hot rolled steel sheets and strip
Q/BQB 301 Hot-rolled steel sheets and strips - Dimensions, shape, weight
and tolerances
3 Classification and code
3.1 Designation, nominal thickness and use of steel plate and strip are shown
in Table 1.
3.2 Classify according to surface treatment method into.
pickling surface
rolling surface
3.3 Classify according to surface quality grade into.
ordinary surface FA
higher surface FB
3.4 Classify according to product category into.
hot-rolled steel strip
hot-rolled steel plate
hot-rolled longitudinal cutting steel strip
hot-rolled pickling steel strip
hot-rolled pickling steel plate
6.1.1 The designation and chemical composition (melting analysis) of steel
shall comply with the provisions of Table 3 ~ Table 5.
6.1.2 The content of residual elements in steel shall comply with the following
provisions.
Cu ≤ 0.20%, Cr ≤ 0.15%, Ni ≤ 0.15%; however, if the supplier can ensure that
the contents of Cu, Cr, Ni, the residual elements, in steel comply with the
aforementioned provisions, the chemical analysis of these elements may not
be carried out.
6.1.3 The tolerance of finished chemical composition of steel plate and strip
shall comply with the provisions of GB/T 222.
6.2 Smelting method
The steel used for steel plate and strip uses oxygen converter smelting.
6.3 Delivery state
The steel plate and strip shall be delivered in hot-rolling state or controlled
rolling state.
Table 3
Designation Chemical composition
a (mass fraction) %
C Si Mn P S N b Ceq c
SS330 ≤ 0.15 ≤ 0.30 ≤ 0.95
≤ 0.035 ≤ 0.035
- -
SS400 ≤ 0.21 ≤ 0.30 ≤ 1.40 - -
SS490 ≤ 0.22 ≤ 0.25 ≤ 1.40 - -
SS540 ≤ 0.30 ≤ 0.25 ≤ 1.60 - -
S185 - - - ≤ 0.040 ≤ 0.040 - -
S235JR
≤ 0.17 ≤ 0.35 ≤ 1.40
≤ 0.035 ≤ 0.035 ≤ 0.012 ≤ 0.35 S235J0 ≤ 0.030 ≤ 0.030
S235J2 ≤ 0.025 ≤ 0.025 -
S275JR ≤ 0.21
≤ 0.35 ≤ 1.50
≤ 0.035 ≤ 0.035 ≤0.012 ≤ 0.40 S275J0 ≤ 0.18 ≤ 0.030 ≤ 0.030
S275J2 ≤ 0.18 ≤ 0.025 ≤ 0.025 -
E295 ≤ 0.30 ≤ 0.35 ≤ 1.60 ≤ 0.035 ≤ 0.035 ≤ 0.012 -
S355JR ≤ 0.24
≤ 0.55 ≤ 1.60
≤0.035 ≤0.035 ≤0.012
≤ 0.45 S355J0 ≤ 0.20 ≤ 0.030 ≤ 0.030S355J2 ≤ 0.20 ≤ 0.025 ≤ 0.025 ‐ S355K2 ≤ 0.20 ≤ 0.025 ≤ 0.025
Table 5
Designation Chemical composition (mass fraction) % C Si Mn P S Other a
SPHT1 ≤ 0.10
≤ 0.35
≤ 0.50
≤ 0.035 ≤ 0.035 - SPHT2 ≤ 0.18 ≤ 0.60 SPHT3 ≤ 0.25 0.30 ~ 0.90
SPHT4 ≤ 0.30 0.30 ~ 1.00
a Other alloying elements can be added as required.
6.4 Surface treatment method
6.4.1 Surface treatment of steel plate and strip can use two methods. rolling
surface and pickling surface.
6.4.2 The steel plate and strip of pickling surface can be delivered in oiled
state or un-oiled state. The oiled pickling steel plate and strip, under normal
packaging, transport, handling and storage conditions, the supplier shall ensure
that the product shall not have rust within three months since the date of
production, and the oil film shall be removed by alkaline aqueous solution. If the
buyer requires the delivery in unoiled pickling steel plate and strip, it shall be
indicated in the contract. It is easy for the unoiled pickling steel plate and strip
to have rust and abrasion during transport and processing and the supplier
does not guarantee this.
6.5 Mechanical and processing properties
6.5.1 The mechanical and processing properties of steel plate and strip
should comply with the corresponding provisions in Table 6 ~ Table 10.
6.5.2 After bending test, there shall be no visible cracks at the outer surface
of the specimen. If the supplier......
Related standard:   Q/BQB 293-2018  Q/BQB 310-2018
   
 
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