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Q/BQB 303-2014 English PDF (QBQB303-2014)

Q/BQB 303-2014 English PDF (QBQB303-2014)

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Q/BQB 303-2014: Continuously hot-rolled steel sheet and strip for general structure

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.
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
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 and 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 can ensure qualified bending test, it may not carry out this test.
6.5.3 The impact energy value is the average value of a set of three test specimens. The test result of one specimen is allowed to be less than the predetermined value but not less than 70% of the predetermined value.
6.5.4 The impact test specified in Table 6 ~ Table 8 is only applicable to the product of which the thickness t ??? 12.0 mm. If the user requires to carry out the impact test for the product of which the thickness t < 12.0 mm, it shall be indicated in the contract based on the negotiation between both parties to use 10 mm ?? 7.5 mm specimen or 10.0 mm ?? 5.0 mm specimen. The minimum
impact energy required at this time shall be respectively 5/6 or 2/3 of the impact energy listed in Table 6 ~ Table 8.
6.5.5 According to buyer?€?s requirements, after negotiating between both parties and specifying in the contact, it ...

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