GB/T 699-2015 PDF English
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Quality carbon structure steels
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GB/T 699-1999 | English | 70 |
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[Replaced by GB/T 699-2015] Quality carbon structural steels
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Quality carbon structure steel--Technical requirements
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GB/T 699-2015: Quality carbon structure steels---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT699-2015
GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.45
H 40
Replacing GB/T 699-1999
Quality carbon structure steels
Issued on: DECEMBER 10, 2015
Implemented on: NOVEMBER 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Classifications and Code... 8
4 Order Information... 8
5 Size, Appearance and Weight... 9
6 Technical Requirements... 9
7 Test Methods... 15
8 Inspection Rules... 16
9 Packaging, Marks and Quality Certificate... 17
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 699-1999 Quality Carbon Structural Steels.
Compared with GB/T 699-1999, the main technical changes are as follows.
- Deleted steel bar classification according to metallurgical quality; added
classification according to surface type (see Clause 3 of this Standard;
Clause 4, Table 2 & Table 4 in GB/T 699-1999);
- Deleted rimmed steel and semi-killed steel (see Table 1 of this Standard;
Sub-clause 6.1.1.6 and 6.1.1.8 in GB/T 699-1999);
- Modified chemical composition of the Steel 08Al (see footnote c in Table
1 of this Standard; Sub-clause 6.1.1.5 in GB/T 699-1999);
- Specified “yield point” as “lower yield strength Rel or specific plastic
extension strength Rp0.2” (see Table 2 of this Standard; Table 3 in GB/T
699-1999);
- Increased allowable adjustment range of heat treatment temperature (see
footnote c in Table 2 of this Standard);
- Modified sampling provisions on steel bar mechanical properties change
wrought (rolled) (see setting in Table 2 of this Standard; Sub-clause 6.4.2
in GB/T 699-1999);
- Specified requirements for forging steel (see Sub-clause 6.5.1 of this
Standard; Sub-clause 6.5.1 in GB/T 699-1999);
- Increased macrostructure requirements for continuously cast steel (see
Table 3 of this Standard);
- Subdivided surface imperfection into imperfection and defect (see Sub-
clause 6.6.1 and 6.8 of this Standard; Sub-clause 6.6.1 and 6.9 in GB/T
699-1999);
- Added that surface quality shall comply with provisions of GB/T 28300
(see Sub-clause 6.8.4 of this Standard).
- Modified sampling number of impact test, microstructure inspection, etc.
(see Table 7 of this Standard);
- Added requirements that steel bar test results use numerical rounding
rules (see Sub-clause 8.4.3 of this Standard).
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of the Technical Committee on
Steel of Standardization Committee of China (SAC/TC 183).
The main drafting organizations of this Standard. Information Standard Institute
of the Ministry of Metallurgical Industry, Shijiazhuang Iron and Steel Co., Ltd.,
Fujian Province Sanming Steel (Group) Co., Ltd., Tianjin Iron and Steel Group
Co., Ltd., Daye Special Steel Co., Ltd., Shougang Group, Qingdao Iron and
Steel Co., Ltd.
Main drafters of this Standard. Luan Yan, Dai Qiang, Meng Ruiying, Liu
Jianfeng, Liu Guihua, Sun Zhicheng, Gong Cui, Hu Haiping, Liu Junhui, Yan
Chengming, Deng Zhiyong.
This Standard replaces the following previous standards.
- GB 699-1965, GB 699-1988, GB/T 699-1999.
Quality Carbon Structural Steels
1 Scope
This Standard specifies classification and code, order information, size,
appearance and weight, technical requirements, test methods, inspection rules,
packaging, marks and quality certificate of quality carbon structural steel bars.
This Standard is applicable to hot-rolled or forged quality carbon structural steel
bars of which nominal diameter or thickness is not greater than 250 mm. Hot-
rolled or forged quality carbon structural steel bars of which nominal diameter
or thickness is greater than 250 mm shall also be supplied, as agreed between
the buyer and the supplier (hereinafter referred to as steel bars)
The designations and chemical composition specified in this Standard are also
applicable to steel ingots, steel billets, steels and its products of other cross-
sections.
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 Method of sampling steel for determination of chemical
composition and permissible variations for product analysis
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total
silicon content - Reduced molybdosilicate spectrophotometric method
GB/T 223.11 Iron steel and alloy--Determination of chromium content -
Visual titration or potentiometric titration method
GB/T 223.19 Methods for chemical analysis of iron steel and alloy - The
neocuproine-chloroform extraction photometric method for the determination
of copper content
GB/T 223.23 Iron steel and alloy - Determination of nickel content - The
dimethylglyoxime spectrophotometric method
GB/T 223.59 Iron, steel and alloy - Determination of phosphorus content
- Bismuth phosphomolybdate blue spectrophotometric method and antimony
phosphomolybdate blue spectrophotometric method
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The
sodium (potassium) periodate photometric method for the determination of
manganese content
GB/T 223.79 Iron and steel - Determination of multi-element contents - X-
ray fluorescence spectrometry (Routine method)
GB/T 223.81 Iron steel and alloy - Determination of total aluminum and total
boron contents - Microwave digestion-inductively coupled plasma mass
spectrometric method
GB/T 223.85 Steel and iron - Determination of sulfur content - Infrared
absorption method after combustion in an induction furnace
GB/T 223.86 Steel and iron - Determination of total carbon content -
Infrared absorption method after combustion in an induction furnace
GB/T 224 Determination of depth of decarburization of steel
GB/T 225 Steel - Hardenability test by end quenching (Jominy test)
GB/T 226 Etch test for macrostructure and defect of steels
GB/T 228.1 Metallic materials - Tensile testing - Part 1.Method of test at
room temperature
GB/T 229 Metallic materials - Charpy notch impact test
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1.Test method
GB/T 702 Hot-rolled steel bars - Dimensions, shape, weight and tolerances
GB/T 908 Forged round and square steels dimension, shape, weight and
tolerance
GB/T 1979 Standard Diagrams for Macrostructure and Defect of Structural
Steels
GB/T 2101 General requirement of acceptance packaging marking and
certification for section steel
GB/T 2975 Steel and steel products - Location and preparation of test
pieces for mechanical testing
GB/T 4162 Forged and Rolled Steel Bars - Method for Ultrasonic
Examination
GB/T 4336 Standard test method for spark discharge atomic emission
spectrometric analysis of carbon and low-alloy steel (routine method)
GB/T 6394 Metal - methods for estimating the average grain size
GB/T 6402 Steel forgings - Method for ultrasonic examination
GB/T 7736 Ultrasonic Inspecting Method for Macro-structure and
Imperfection of Steel Method for the test of mean grain fineness of metals
GB/T 8170-2008 Rules of rounding off for numerical values & expression
and judgement of limiting values
GB/T 10561 Steel - Determination of content of non-metallic inclusion-
Micrographic method using standard diagrams
GB/T 11261 Steel and Iron - Determination of oxygen content - The pulse
heating inert gas fusion - Infra-red absorption method
GB/T 13298 Metal - Inspection method of microstructure
GB/T 13299 Steel - Determination of microstructure
GB/T 15711 Steel Products - Method for Etch Test of Tower Sample
GB/T 17505 Steel and Steel Products - General Technical Delivery
Requirements
GB/T 20066 Steel and Iron - Sampling and Preparation of Samples for the
Determination of Chemical Composition
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 20124 Steel and iron - Determination of nitrogen content - Thermal
conductimetric method after fusion in a current of inert gas (Routine method)
GB/T 20125 Low-alloy steel - Determination of multi-element contents -
Inductively coupled plasma atomic emission spectrometric method
GB/T 21834 Medium and low alloy steel - Determination of the distribution
of multi-element contents - Original position statistic distribution analysis
method
GB/T 28300 Surface quality classes for hot-rolled bars and rods technical
delivery conditions
YB/T 4306 Steel iron and alloy - Determination of nitrogen content in steel
and alloy inert gas fusion thermal conductivity method
YB/T 5293 Metallic materials - Forging test
3 Classifications and Code
3.1 Steel bar is classified into two categories according to the processing
method used.
a) Steel for pressed work UP
1) Steel for hot pressed work UHP
2) Steel for upsetting work UF
3) Steel for cold drawn billet UCD
b) Steel for cutting work UC
3.2 Steel bar is classified into five categories according to the type of surface.
a) Pressure processing surface SPP
b) Pickling surface SA
c) Shot blasting surface SS
d) Stripping surface SF
e) Polishing surface SP
4 Order Information
The contracts or purchase orders ordered according to this Standard shall
contain the following contents.
a) Standard code number;
b) Name of product;
c) Designations or unified numerical code;
d) Weight (quantity) of delivery;
e) Dimension, appearance and allowance (see Clause 5);
f) The processing method to be used (see cutting steel if not indicated);
g) Heat treatment delivery or special surface state delivery (see 6.3.2 and
6.3.3 if required);
5 Size, Appearance and Weight
5.1 The size, appearance, weight and allowance of hot-rolled steel bars shall
comply with relevant provisions in GB/T 702.Specific requirements shall be
clearly stated in the contract.
6 Technical Requirements
6.1 Designations and Chemical Composition
6.1.1 Designations, unified numerical code and chemical composition
(smelting analysis) of steels shall comply with Table 1.
6.1.2 The nitrogen content of steels smelted in oxygen-blown converters shall
not be higher than 0.008%. If the supplier can guarantee the conformance, the
analysis may be exempted.
6.1.3 The manganese content of 35~85 steels for lead-bath quenched steel
wires shall be 0.30%~0.60%; the manganese content of 65 Mn and 70 Mn shall
be 0.70%~1.00%; the chromium content shall not be higher than 0.10%, the
nickel content shall not be higher than 0.15%, the copper content shall not be
higher than 0.20%; the sulfur and phosphorus contents shall comply with the
requirements of steel wire standards, but shall not be higher than the indexes
in Table 1.
6.1.4 The allowance for chemical composition of steel bars (or billets) shall
comply with the provisions in GB/T 222.
6.2 Smelting Method
Unless otherwise specified in the contract, the smelting method shall be chosen
by the manufacturer.
6.3 State of Delivery
6.3.1 Steel bars are normally delivered in the hot-rolled or hot-forged state.
6.3.2 It may also be delivered in the heat treated (annealed, normalized or
high temperature tempered) based on buyer’s requirements and it shall be
stated in the contract.
6.3.3 It may also be delivered with special surface sate (pickling, shot blasting,
stripping, polishing) based on buyer’s requirements and it shall be stated in the
contract.
6.4 Mechanical Properties
6.4.1 For test sample made of heat-treated (normalized) billet, the
longitudinal tensile properties of steel bar shall comply with the provisions in
Table 2.If the supplier can guarantee the conformance of tensile properties, the
tests may be exempted.
7 Test Methods
Test items and test methods of steel bar are shown in Table 7.
8 Inspection Rules
8.1 Inspections and Acceptance
8.1.1 Factory inspection and acceptance shall be carried out by the quality
technical supervision department of the supplier.
8.1.2 The supplier must ensure that the steel bar delivered complies with the
provisions of this Standard or of the contract. The buyer is entitled to make
inspection or acceptance to any of the test items defined in this Standard or the
contract if necessary.
8.2 Batch-group Rules
Steel bar shall be inspected and accepted according to batch. Each batch
consists of steel material with the same designation, the same furnace number,
the same working method, the same size, the same delivery state, the same
heat treatment system (or furnace lot).
8.3 Quantity and Location for Sampling
The quantity and location for sampling of each batch of steel bar shall comply
with the provisions in Table 7.
8.4 Re-inspection and Judging Rules
8.4.1 The re-inspection and judging rules shall be in compliance with
provisions in standard GB/T 17505.
8.4.2 If the supplier can guarantee the conformance of the steel material, it is
allowed to use billet to substitute material, or to use large pieces to substitute
small pieces - for the same furnace (tank) steel-material or steel-billet’s macro-
test, mechanical properties and non-metallic inclusion’s inspection result.
9 Packaging, Marks and Quality Certificate
Packaging, marks and quality certificates of the steel bar shall comply with the
provisions of GB/T 2101.
...... Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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