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GB/T 16270-2009 (GBT16270-2009)

GB/T 16270-2009_English: PDF (GBT 16270-2009, GBT16270-2009)
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GB/T 16270-2009English70 Add to Cart 0--9 seconds. Auto-delivery High strength structural steel plates in the quenched and tempered condition Valid GB/T 16270-2009

BASIC DATA
Standard ID GB/T 16270-2009 (GB/T16270-2009)
Description (Translated English) High strength structural steel plates in the quenched and tempered condition
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H46
Classification of International Standard 77.140.50
Word Count Estimation 10,163
Date of Issue 2009-06-25
Date of Implementation 2010-04-01
Older Standard (superseded by this standard) GB/T 16270-1996
Quoted Standard GB/T 222; GB/T 223.5; GB/T 223.9; GB/T 223.11; GB/T 223.14; GB/T 223.16; GB/T 223.17; GB/T 223.19; GB/T 223.23; GB/T 223.26; GB/T 223.40; GB/T 223.53; GB/T 223.54; GB/T 223.58; GB/T 223.59; GB/T 223.60; GB/T 223.62; GB/T 223.63; GB/T 223.64; GB/T 223.68; GB/T 223.69; GB/T 223.76; GB/T 223.78; GB/T 228; GB/T 229; GB/T 247; GB/T 709; GB/T 2970; GB/T 2975; GB/T 4336; GB/T 14977; GB/T 17505; GB/T 20123; GB/T 20125; GB/T 20126; GB/T 20066; YB/T 081
Drafting Organization Baoshan Iron & Steel Co., Ltd.
Administrative Organization National Steel Standardization Technical Committee
Regulation (derived from) National Standard Approval Announcement 2009 No.9 (Total No.149)
Proposing organization China Iron and Steel Association
Issuing agency(ies) Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China
Summary This standard specifies the grades of high-strength quenched and tempered structural steel, dimensions, shape, test methods, , weight and tolerance, technical requirements for inspection rules, packaging, marking and quality certification, etc. This standard applies to a thickness of not more than 150mm, to quenching (haggard fire tempered) state delivery of high-strength structural steel.

Standards related to: GB/T 16270-2009

GB/T 16270-2009
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 16270-1996
High strength structural steel plates in the
quenched and tempered condition
ISSUED ON. JUNE 25, 2009
IMPLEMENTED ON. APRIL 1, 2010
Jointly Issued by. General Administration of Quality Supervision, Inspection and
Quarantine (AQSIQ);
Standardization Administration (SAC) of the People’s Republic
of China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Denomination methods of designation ... 8 
4 Information required when ordering ... 8 
5. Size, shape, weight and allowable deviation ... 8 
6 Technical Requirements ... 9 
7 Test Methods ... 12 
8 Inspection Rules ... 13 
9 Packaging, mark and quality certificate ... 13 
10 Rounding off of numerical values ... 14 
11 Approximate contrast of domestic-foreign designations... 14 
Appendix A ... 15 
Foreword 
This Standard is formulated by reference to EN 10025-6.2004 (E) "Hot rolled products
of structural steels, Part 6. Technical delivery conditions for flat products of high yield
strength structural steels in the quenched and tempered condition"; ISO 4950.3-2003
"High yield strength flat products, Part 3. quenched and tempered steel"; and on the
basis of production technology of domestic steel enterprise and through revising GB/T
16270-1996 "High-strength structural steel plates and strips. products supplied in the
heat-treated or controlled rolled condition".
This Standard replaces GB/T 16270-1996 "High-strength structural steel plates and
strips. products supplied in the heat-treated or controlled rolled condition".
Compared with GB/T 16270-1996, the main changes in this Standard are as follows.
– Standard name is changed to "High strength structural steel plates in quenched
and tempered condition";
– Applicable thickness is extended from 100mm to 150mm, steel strip is deleted;
– Q420 is deleted; 3 grades of steel Q800, Q890 and Q960 and the
corresponding technical indexes’ specifications are added;
– Quality grade C, F (except grade of steel Q460) are added; compositions and
performances’ specifications of every designation are adjusted;
– Specifications of flexural property are deleted;
– Requirements of CEV are added; and “taking CET as the terms of consultation
by both buyer and seller” is supplemented;
– Delivery states such as normalizing, normalizing + tempering, controlled rolling
are deleted.
Appendix A of this Standard is informative.
This Standard was proposed by China Iron & Steel Association.
This Standard shall be under jurisdiction of China Steel Standardization Technical
Committee.
Main drafting organizations of this Standard. Bao Steel Co., Ltd, China Metallurgical
Information Standardization Research Institute, and Hunan Hualin Linyuan Steel Co.,
Ltd.
Main drafters of this Standard. Wang Xiangru, Zhou Shenyu, Wang Xiaohu, Wen
Dezhi, and Zhoujian.
High strength structural steel plates in the quenched and
tempered condition
1 Scope 
This Standard specifies designations, dimension, shape, weight, and allowable
deviation, technical requirements, test method, inspection rules, packaging, marks
and quality certificate of high strength structural steel plates in quenched and
tempered condition.
This Standard is applicable to high strength structural steel plate whose thickness
shall not exceed 150mm and delivery state is slack quenching (quench plus
tempering).
2 Normative References 
The following standards contain provisions which, through reference in this text,
constitute provisions of this national standard. For dated reference, subsequent
amendments (excluding corrigendum) or revisions of these publications do not apply.
However, the parties who enter into agreement according to these specifications are
encouraged to study whether the latest editions of these references are applicable.
For undated references, the latest edition of the normative document is applicable to
this Standard.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.5 Methods for chemical analysis of steel and alloy - The reduced
molybdosilicate spectro-photometric method for the determination of acid-soluble
silicon content
GB/T 223.9 Iron steel and alloy - Determination of aluminium content - Chrom
azurol S photometric method
GB/T 223.11 Methods for chemical analysis of iron, steel and alloy - The
ammonium persulfate oxidation volumetric method for the determination of
chromium content
GB/T 223.14 Methods for chemical analysis of iron, steel and alloy - The
N-benzoy-N-phenylhydroxylamine extraction photometric method for the
determination of vanadium content
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy - The potassium
iodate titration method after combustion in the pipe furnace for the determination of
sulfur content
GB/T 223.69 Methods for chemical analysis of iron, steel and alloy - The
gas-volumetric method after combustion in the pipe furnace for the determination
of carbon content
GB/T223.76 Methods for chemical analysis of iron, steel and alloy - The flame
atomic absorption spectrometric method for the determination of vanadium content
GB/T 223.78 Methods for chemical analysis of iron, steel and alloy - Curcumin
spectrophotometric method for the determination of boron content
GB/T 228 Metallic materials - Tensile testing at ambient temperature (GB/T
228-2002, eqv ISO 6892.1998)
GB/T 229 Metallic materials - Charpy pendulum impact test method (GB/T
229-2007, ISO 148-1.2006, MOD)
GB/T 247 General Rule of Acceptance, Package, Mark and Certification for Steel
Plates (Sheets) and Strips
GB/T 709 Dimension, Shape, Weight and Tolerances for Hot Rolled Sheets and
Plates
GB/T 2970 Thicker Steel Plates - Method for Ultrasonic Inspection
GB/T 2975 Steel and steel products - Location and preparation of test pieces for
mechanical testing (GB/T 2975-1998, eqv ISO 377.1997)
GB/T 4336 Standard test method for spark discharge atomic emission
spectrometry Spectrometric analysis of carbon and low-Alloy steel (Routine
Method)
GB/T 14977 General requirement for surface condition of hot-rolled steel plates
GB/T 17505 Steel and steel products General technical delivery requirements
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content
Infrared absorption method after combustion in an induction furnace (routine
method)(GB/T 20123-2006, ISO 15350.2000, IDT)
GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively
coupled plasma atomic emission spectrometric method
GB/T 20126 Unalloyed steel - Determination of low carbon content - Part 2.
Infrared absorption method after combustion in an induction furnace (with
preheating) (GB/T 20126-2006, ISO 15349-2.1999, IDT)
6 Technical Requirements 
6.1 Designation and chemical composition
6.1.1 Steel designation, chemical composition (smelting analysis) and
carbon-equivalent value CEV shall comply with the specifications of Table 1.
6.1.2 According to the requirements of the buyer, through the negotiation of both
buyer and seller, and indicated in the contract, carbon-equivalent value CET can be
provided at CET = C + (Mn+Mo)/10 + (Cr+Cu)/20 + Ni/40.
6.1.3 The allowable deviation of chemical composition of finished steel plate shall
comply with the provisions of GB/T 222.
6.2 Smelting process
By oxygen converter or electro-smelting.
6.3 Delivery state
Delivery of steel plate shall follow the state of slack quenching (quench + tempering).
6.4 Mechanical Properties and Processing Properties
6.4.1 The mechanical properties of steel plate and processing property shall meet the
requirements of Table 2.
6.4.2 Charpy pendulum impact energy shall be calculated by arithmetic mean value of
three specimens from one group. It is allowed that a single-value of 1 of the samples
is below the specified value of Table 2, however, it shall not be lower than 70% of the
specified value.
6.4.3 If the steel plate’s thickness is less than 12mm, auxiliary specimen shall be
adopted for Charpy pendulum impact test of steel plate. If the thickness >8mm ~
< 12mm, auxiliary specimen size of steel plate shall be 10mm * 7.5mm * 55mm; the
test result shall not be less than 75% of the specified value. If the thickness is
between 6mm~8mm, auxiliary specimen size of steel plate shall be 10mm * 5mm *
55mm; the test result shall not be less than 75% of the specified value. Impact test
shall not be carried out for the steel plate whose thickness is less than 6mm.
6.5 Surface Quality
6.5.1 Flaw, bubble, scab, fold and inclusion etc. shall not be allow...
...