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GB/T 699-2015 PDF in English


GB/T 699-2015 (GB/T699-2015, GBT 699-2015, GBT699-2015)
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GB/T 699-2015: PDF in English (GBT 699-2015)

GB/T 699-2015
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).
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
12 U20602 60 0.57~0.65 0.17~0.37 0.50~0.80 0.035 0.035 0.25 0.30 0.25
13 U20652 65 0.62~0.70 0.17~0.37 0.50~0.80 0.035 0.035 0.25 0.30 0.25
14 U20702 70 0.67~0.75 0.17~0.37 0.50~0.80 0.035 0.035 0.25 0.30 0.25
15 U20702 75 0.72~0.80 0.17~0.37 0.50~0.80 0.035 0.035 0.25 0.30 0.25
16 U20802 80 0.77~0.85 0.17~0.37 0.50~0.80 0.035 0.035 0.25 0.30 0.25
17 U20852 85 0.82~0.90 0.17~0.37 0.50~0.80 0.035 0.035 0.25 0.30 0.25
18 U21152 15 Mn 0.12~0.18 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25
19 U21202 20 Mn 0.17~0.23 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25
20 U21252 25 Mn 0.22~0.29 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25
21 U21302 30 Mn 0.27~0.34 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25
22 U21352 35 Mn 0.32~0.39 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25
23 U21402 40 Mn 0.37~0.44 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25
24 U21452 45 Mn 0.42~0.50 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25
25 U21502 50 Mn 0.48~0.56 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25
26 U21602 60 Mn 0.57~0.65 0.17~0.37 0.70~1.00 0.035 0.035 0.25 0.30 0.25
27 U21652 65 Mn 0.62~0.70 0.17~0.37 0.90~1.20 0.035 0.035 0.25 0.30 0.25
28 U21702 70 Mn 0.67~0.75 0.17~0.37 0.90~1.20 0.035 0.035 0.25 0.30 0.25
Elements not in the table cannot be added without buyer’s agreement. Measures shall be taken to prevent elements
of scrap steel or other raw materials from being brought in to affect the performance of steel.
a Copper content in thermal pressure processing steel shall not exceed 0.20%;
b For killed steel deoxidized by aluminum, there is no lower limit for the content of carbon and manganese; the upper
limit of manganese content is 0.45%; silicon content is not more than 0.03%; aluminum content is 0.020%~0.070%;
the designation is 08Al.
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
14 Surface quality Piece by piece On whole steel bar Visual inspection or GB/T 28300
15 Size, appearance Piece by piece O...
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.