GB/T 3191-2019_English: PDF (GB/T3191-2019)
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| Standard ID | GB/T 3191-2019 (GB/T3191-2019) | | Description (Translated English) | Extrusion rods and bars of aluminium and aluminium alloys | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H61 | | Classification of International Standard | 77.150.10 | | Word Count Estimation | 22,267 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2020-05-01 | | Drafting Organization | Northwest Aluminum Co., Ltd., Nonferrous Metal Technology and Economic Research Institute, Guangdong Haomei New Materials Co., Ltd., Northeast Light Alloy Co., Ltd., Southwest Aluminum (Group) Co., Ltd., Liaoning Zhongwang Group Co., Ltd., Guangdong Huachang Aluminum Factory Co., Ltd., Guangdong Yonglijian Aluminum Co., Ltd., Shandong Nanshan Aluminum Co., Ltd., Shandong Yankuang Light Alloy Co., Ltd., Guangdong Gordon Aluminum Co., Ltd., Youyan Engineering Technology Research Institute Co., Ltd. | | Administrative Organization | National Nonferrous Metals Standardization Technical Committee (SAC/TC 243) | | Proposing organization | China Nonferrous Metals Industry Association | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | | Standard ID | GB/T 3191-2010 (GB/T3191-2010) | | Description (Translated English) | Aluminium and aluminium alloys extruded bars, rods | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H61 | | Classification of International Standard | 77.150.10 | | Word Count Estimation | 21,292 | | Date of Issue | 2011/1/14 | | Date of Implementation | 2011/11/1 | | Older Standard (superseded by this standard) | GB/T 3191-1998 | | Quoted Standard | GB/T 228; GB/T 3190; GB/T 3199; GB/T 3246.1; GB/T 3246.2; GB/T 6519; GB/T 2039; GB/T 7999; GB/T 16865; GB/T 17432; GB/T 20975 | | Adopted Standard | ASTM B221M-2008, NEQ | | Drafting Organization | China Chalco Co., Ltd. Northwest Aluminum Branch | | Administrative Organization | National Non-ferrous metals Standardization Technical Committee | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 2 of 2011 | | Proposing organization | China Nonferrous Metals Industry 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 aluminum and aluminum alloys for general industrial use of extruded bars (hereinafter referred to as the bar) requirements, test methods, inspection rules and signs, packaging, transportation, storage and quality certificates and contracts (or orders) content. This Standard is applicable to ring-shaped cross-section rods (hereinafter referred to as day bar), a square cross-section bar (hereinafter referred to as square bar), and a regular hexagonal cross section of the rod (hereinafter referred to as hexagonal rods). | | Standard ID | GB/T 3191-1998 (GB/T3191-1998) | | Description (Translated English) | Extrusion rods and bars of aluminium and aluminium alloy | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H61 | | Classification of International Standard | 77.12 | | Word Count Estimation | 14,122 | | Date of Issue | 1998/7/15 | | Date of Implementation | 1999/2/1 | | Older Standard (superseded by this standard) | GB 3191-1982; GB 3192-1982; GB 10572-1989 | | Quoted Standard | GB/T 228-1987; GB/T 3190-1996; GB/T 3199-1996; GB/T 3246-1982; GB/T 3247-1982; GB/T 6395-1986; GB/T 6987-1987; GB/T 16865-1997; GB/T 17432-1998 | | Adopted Standard | ASTM B221, NEQ; JIS H4040, NEQ | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 2 of 2011 | | Proposing organization | China Nonferrous Metals Industry Corporation | | Issuing agency(ies) | State Quality and Technical Supervision |
GB/T 3191-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.150.10
H 61
Replacing GB/T 3191-2010
Extrusion rods and bars of aluminium and aluminium
alloys
ISSUED ON: JUNE 04, 2019
IMPLEMENTED ON: MAY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Requirements ... 7
4 Test method ... 20
5 Inspection rules ... 23
6 Marking, packaging, transportation, storage and quality certificate ... 28
7 Order form (or contract) contents ... 29
References ... 31
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 3191-2010, Aluminium and aluminium alloys
extruded bars, rods. Compared with GB/T 3191-2010, the main technical
changes, except editorial changes, are as follows:
-- Delete the normative reference of GB/T 228 (see Chapter 2 and 4.3 of
version 2010);
-- Add the normative reference of GB/T 8170 (see Chapter 2 and 4.1.3);
-- Modify the diameter supply specifications of round rods from "5 mm ~ 600
mm" to "5 mm ~ 350 mm" (see 3.1.1, 3.1.1 of version 2010);
-- Modify the provisions of the average value of magnesium content of 5 ×××
alloys in class-I and class-II designations, that is, change the average
value of magnesium content of 5 ××× alloys in class-II designation from
“greater than or equal to 3%” to “greater than or equal to 4%; change the
average value of magnesium content of 5 ××× alloys in class-I designation
from“ less than 3% ”to“ less than 4% ”(see 3.1.1, 3.1.1 of version 2010);
-- Add rods and bars of designations 2219, 2618, 6101B, 6110A (see 3.1.1);
-- Add status-O rods and bars of designations 1050A, 2014, and 2014A (see
3.1.1);
-- Add status T8, T8510, T8511 rods and bars of designation 2024 (see 3.1.1);
-- Add status T1, T73, T73510, T73511 rods and bars of designation 7075
(see 3.1.1);
-- Modify the regulations of marking and examples in product classification
(see 3.1.2, 3.1.2 of version 2010);
-- Modify the provisions of “if it is not specified, it will be supplied as grade-A”
in section dimensions of dimensional deviation (see 3.3.1, 3.3.1 of version
2010);
-- Modify the name of "fillet radius” to "chamfered radius" in "dimensional
deviation” (see 3.3.2, 3.3.2 of version 2010);
-- Modify the requirements for bending in dimensional deviation (see 3.3.3,
3.3.3 of version 2010);
Extrusion rods and bars of aluminium and aluminium
alloys
1 Scope
This Standard specifies the requirements, test methods, inspection rules and
marking, packaging, transportation, storage, quality certificate and order form
(or contract) contents of extrusion rods and bars of aluminium and aluminium
alloys.
This Standard applies to extrusion round rods, square rods and hexagonal rods
(hereinafter referred to as “rods and bars") of aluminium and aluminium alloys.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB/T 2039, Metallic materials - Uniaxial creep testing method in tension
GB/T 3190, Wrought aluminum and aluminum alloy - Chemical composition
GB/T 3199, Wrought aluminium and aluminium alloy products - Packing,
marking, transporting and storing
GB/T 3246.1, Inspection method for structure of wrought aluminum and
aluminum alloy products - Part 1: Inspection method for microstructure
GB/T 3246.2, Inspection method for structure of wrought aluminum and
aluminum alloy products - Part 2: Inspection method for macrostructure
GB/T 6519, Ultrasonic inspection of wrought aluminium and magnesium
alloy products
GB/T 7999, Optical emission spectrometric analysis method of aluminum
and aluminum alloys
GB/T 8170, Rules of rounding off for numerical values & expression and
judgment of limiting values
GB/T 16475-2008, Temper designation system for wrought aluminium and
aluminium alloy
3.9.1 The microstructure of the rods and bars after quenching is not allowed to
be overburnt.
3.9.2 The microstructure of 4A11, 4032 alloy rods and bars allow the presence
of a small amount of primary silicon; but the distribution shall be uniform and
not clustered; the maximum line size of primary silicon does not exceed 0.08
mm.
3.9.3 When there are special requirements for the grain size of the
microstructure, the supplier and the buyer shall negotiate with each other and
indicate in the order form (or contract).
3.10 Appearance quality
3.10.1 Cracks, bubbles or corrosive spots are not permitted on the surface of
the rod.
3.10.2 Peeling on the surface of the rods and bars, if any, shall be removed;
however, the diameter of the round rods and the thickness of the square rods
or hexagonal rods after removal must not exceed the allowable deviation range.
3.10.3 The surface of the rods and bars is not allowed to have bruises,
scratches, abrasions, dents, and defects such as straightening marks due to
straightening, where the depth exceeds the negative deviation of the diameter
of the round rods, or the negative deviation of the thickness of the square or
hexagonal rods. And the diameter of the round rods, or the thickness of the
square rods or the hexagonal rods, after the depth of the defect is deducted,
must not exceed the allowable deviation range.
4 Test method
4.1 Chemical composition
4.1.1 Perform routine chemical analysis only on the numerically specified
elements other than those in the columns of the “Al” and “Other” of
corresponding designations in GB/T 3190. When the mass fraction of the non-
routine analysis element is suspected to exceed the limit value of this Standard,
the producer shall analyze these elements.
4.1.2 The analysis method of chemical composition shall comply with
requirements of GB/T 20975 or GB/T 7999; the arbitration analysis shall adopt
the methods which are specified in GB/T 20975.
4.1.3 The determination of analysis value is based on the rounding comparison
method; the value rounding rules shall be carried out in accordance with the
Notes:
T1, T2 -- the gap values between the two ends of the raised ends of the rod and
the platform.
Figure 3 -- Schematic diagram of measurement of the twisting degree of
square rods
4.2.6 Length
The length of the rod shall be measured by a tape whose accuracy is not less
than 0.1 mm or other gauges of corresponding accuracy.
4.3 Room-temperature tensile mechanical properties
Perform the room-temperature tensile test according to the method that is
specified in GB/T 16865.
4.4 High-temperature endurance tensile mechanical properties
Perform the high-temperature endurance tensile mechanical properties
according to the provisions in GB/T 2039.
4.5 Ultrasonic flaw detection performance
Perform the ultrasonic flaw detection in accordance with GB/T 6519.
4.6 Macro-structure
Inspect the macro-structure in accordance with the method that is specified in
GB/T 3246.2.
4.7 Microstructure
Inspect the microstructure in accordance with the method that is specified in
GB/T 3246.1.
4.8 Appearance quality
Visually inspect the appearance quality under natural scattered light. If
necessary, use dimensional measurement tools to define the defect size;
determine the defect depth by grinding.
5 Inspection rules
5.1 Inspection and acceptance
5.1.1 The product shall be inspected by the supplier to ensure that the product
quality complies with the requirements of this Standard and the order form (or
the contract); the supplier shall fill in the quality certificate.
5.1.2 The buyer shall inspect the received products in accordance with the
provisions of this Standard. If the test result is inconsistent with the provisions
of this Standard and the order form (or the contract), a written form shall be
submitted to the supplier; the issue shall be settled by negotiation between the
supplier and the buyer. Objections of appearance quality and dimensional
deviation shall be filed within one month from the date of receipt of the product;
objections of other performances shall be filed within three months from the
date of receipt of the product. Arbitration, if required, may be carried out by an
organization which is recognized by both the supplier and the buyer; the
sampling shall be jointly done by the buyer.
5.2 Batch
Products shall be submitted for acceptance in batches. Each batch shall consist
of products of the same designation, status and dimensions; the weight of each
batch is not limited.
5.3 Weight
The products shall be weighed on the scales (unless it is otherwise agreed by
the supplier and the buyer).
5.4 Inspection items
5.4.1 Each batch of products, before being delivered, shall be inspected for
chemical composition, dimensional deviation, room-temperature tensile
mechanical properties and appearance quality.
5.4.2 For rods and bars whose diameter or thickness is not less than 20.00 mm,
the macro-structure of each batch shall be inspected; for rods and bars whose
macro-structure is less than 20.00 mm, the macro-structure shall be guaranteed
by the supplier process.
5.4.3 Each batch of off-quenched rods and bars shall be inspected for
microstructure.
5.4.4 When the buyer indicates in the order form (or contract) that the inspection
of ultrasonic flaw detection performance is required, the inspection of ultrasonic
flaw detection shall be performed.
5.4.5 When the buyer indicates in the order form (or contract) that the inspection
of high-temperature endurance tensile properties is required, the inspection of
high-temperature endurance tensile properties shall be performed.
repeated test results are qualified, judge the batch (or heat treatment furnace)
of rods and bars to be qualified. If the sample properties are still unqualified in
the repeated test result, then, judge the batch (or heat treatment furnace) of
rods and bars to be unqualified. If it is agreed by both the supplier and the buyer,
the supplier is allowed to inspect the products one by one and deliver those
qualified ones. The supplier is also allowed to perform a repeated heat
treatment to re-sample and test.
5.6.6 When the ultrasonic flaw detection performance of any sample is
unqualified, judge the piece of rod to be unqualified.
5.6.7 When the macro-structure organization of any sample is unqualified,
judge as follows:
a) If it is unqualified because of metallurgical defects such as cracks, bright
grains, non-metallic inclusions, foreign metal inclusions, white spots, and
primary crystals, judge the batch of rods and bars to be unqualified.
However, it is allowed to perform grade-B ultrasonic inspection one by one,
and deliver the qualified ones; or, through negotiation between the
supplier and the buyer, the supplier is allowed to inspect one by one and
deliver those qualified ones.
b) If it is unqualified because of layering, shrinkage or coarse grain zone, it
is allowed to cut a portion from the extrusion end of the rod for repeated
test until it is qualified; then, other rods and bars of the batch shall be tailed
according to the maximum length of the above defect distribution of the
tested rod OR inspected one by one; deliver the qualified ones.
c) When the depth of the coarse grain zone is unqualified, the supplier is
allowed to take samples in the coarse grain zone (if the depth of the coarse
grain zone is less than the diameter or thickness of the standard sample,
the sample shall include the entire depth of the coarse grain zone) to test
the room-temperature vertical tensile mechanical properties; if the
mechanical properties meet the requirements of this Standard, judge the
batch of rods and bars to be qualified; otherwise, judge the batch of rods
and bars to be unqualified.
5.6.8 When the microstructure of any sample is unqualified, judge the batch (or
heat treatment furnace) of rods and bars to be unqualified.
5.6.9 When the appearance quality of any rod is unqualified, judge the rod to
be unqualified.
d) product batch number or date of manufacture;
e) net weight or number of pieces;
f) various of analysis and test results;
g) the inspection stamp of the supplier's quality inspection department;
h) code of this Standard;
i) date of packaging (or date of manufacture).
7 Order form (or contract) contents
The order form (or contract) that orders the materials which are listed in this
Standard shall include the following:
a) product name.
b) designation, status and dimensions.
c) weight (or number of pieces).
d) special requirements of the buyer:
-- special requirements for section dimensions allowable deviation level;
-- special requirements for chamfer radius allowable deviation level;
-- special requirements for vertical bending level;
-- special requirements for twisting degree level;
-- special requirements for room-temperature vertical tensile mechanical
properties;
-- special requirements for high tensile strength performance;
-- special requirements for high-temperature endurance tensile
mechanical properties;
-- special requirements for ultrasonic flaw detection performance;
-- special requirements for unlayered low organization;
-- special requirements for macro-structure coarse grain zone level;
-- special requirements for macro-structure grain size;
......
GB/T 3191-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.150.10
H 61
Replacing GB/T 3191-1998
Aluminium and Aluminium Alloys Extruded Bars,
Rods
ISSUED ON. JANUARY 14, 2011
IMPLEMENTED ON. NOVEMBER 01, 2011
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 ... 4
2 NORMATIVE REFERENCES ... 4
3 REQUIREMENTS ... 5
4 TEST METHODS ... 16
5 INSPECTION RULES ... 18
6 MARKING, PACKING, TRANSPORTATION AND STORAGE, AND
QUALITY CERTIFICATE ... 21
7 CONTENTS OF CONTRACT (OR ORDER) ... 23
Foreword
This Standard replaces GB/T 3191-1998 "Extrusion Rods and Bars of Aluminium and
Aluminium Alloy".
There are significant changes in this Standard, compared with GB/T 3191-1998.
— The dimensional deviation system was modified.
— The mechanical property indexes were modified or supplemented.
This Standard adopts re-drafting method by reference to ASTM B221M-08 "Standard
Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles,
and Tubes". The consistent degree with ASTM B221M-08 is not equivalent.
This Standard was proposed by China Nonferrous Metals Industry Association.
This Standard shall be under the jurisdiction of the National Technical Committee on
Nonferrous Metals of Standardization Administration of China (SAC/TC 243).
Chief drafting organization of this Standard. Aluminium Corporation of China Limited
Northwest Aluminium Fabrication Branch.
Participating drafting organizations of this Standard. Northeast Light Alloy Co., Ltd.,
Southwest Aluminum (Group) Co., Ltd., Longkou Conglin Aluminum Co., Ltd.,
Shandong Nanshan Aluminum Co., Ltd., Fujian Nanping Aluminium Co., Ltd.,
Shandong Yankuang Light Alloy Co., Ltd., Liaoning Zhongwang Group Co., Ltd. AND
Fujian Minfa Aluminium Co., Ltd.
Chief drafting staffs of this Standard. Zhao Haibin, Zhang Wei, Xie Hui, Wang Guojun,
Li Ruishan, Su Zhenjia, Wang Zhaobin and Ying Weidong.
The previous editions replaced by this Standard are as follows.
— GB/T 3191-1982, GB/T 3192-1982, GB/T 10572-1989;
— GB/T 3191-1998.
Aluminium and Aluminium Alloys Extruded Bars,
Rods
1 Scope
This Standard specifies the requirements, test methods, inspection rules, marking,
packing, transportation, storage, quality certificate, and contents of contract (or order)
of the aluminium and aluminium alloy extruded bars and rods for general industrial use.
This Standard is applicable to the bars and rods of round cross section (hereinafter
referred to as "round-rods"), the bars and rods of square cross section (hereinafter
referred to as "square-rods") and the bars and rods [Translator. abbreviated as “bars-
rods”] of regular hexagonal cross section (hereinafter referred to as "hexagonal-rods").
2 Normative References
The following documents are essential for the application of this document. For the
dated reference, only the dated editions are applicable to this Standard. For the
undated references, the latest edition of the normative document (including all
amendments) referred to applies.
GB/T 228 "Metallic Materials - Tensile Testing at Ambient Temperature"
GB/T 3190 "Wrought Aluminium and Aluminium Alloys - Chemical Composition
Limits"
GB 3199 "Wrought Aluminium and Aluminium Alloy Products - Packing, Marking,
Transporting and Storing"
GB/T 3246.1 "Wrought Aluminium and Aluminium Alloys Products Inspection
Method for Structure"
GB/T 3246.2 "Wrought Aluminium and Aluminium Alloys Products Inspection
Method for Macrostructure"
GB/T 6519 "Process for Ultrasonic Inspection of Wrought Aluminum Alloy
Products"
GB/T 2039 "Metallic Materials - Creep and Stress-rupture Test in Tension"
GB/T 7999 "Optical Emission Spectrometric Analysis Method of Aluminum and
Aluminum Alloys"
Designation
Delivery condition Sample condition Specification
Category II
(bars-rods of 2××× and
7××× alloys and those of
5××× alloys with average
magnesium content ≥3%)
Category I
(other bars-
rods except
for Category
II)
O O
5083 —
H112 H112
O O
5086 —
H112 H112
O O
— 6A02 T1, T6 T62, T6
— 6101A T6 T6
— 6005, 6005A
T5 T5
T6 T6
7A04 — T1, T6 T62, T6
7A09 — T1, T6 T62, T6
7A15 — T1, T6 T62, T6
7003 —
T5 T5
T6 T6
7005 — T6 T6
7020 — T6 T6
7021 — T6 T6
7022 — T6 T6
7049A — T6, T6510, T6511 T6, T6510, T6511
7075 —
O O
T6, T6510, T6511 T6, T6510, T6511
— 8A06
O O
H112 H112
3.1.2 Mark illustrations
The product marks shall be expressed according to the sequence of product name,
designation, delivery condition, specification and standard number. The mark
illustrations are listed as follows.
Illustration 1. The round-rods manufactured with 2024 alloy, with delivery condition of T3511,
diameter of 30.00mm and specified length of 3,000mm are marked as.
Rod 2024-T3511 φ30×3000 GB/T 3191-2010
Illustration 2. The high strength square-rods manufactured with 2A11 alloy, with delivery
condition of T4 and incircle diameter of 40.00mm are marked as.
High strength square-rod 2A11l-T4 40 GB/T 3191-2010
Table 5 In. mm
Diameter of incircle
of square-rod
Twist, not larger than
General grade High-precision grade Super-high precision grade
On length of
1 meter Full length L/m
On length of
1 meter Full length L/m
On length of 1
meter Full length L/m
≤30.00 4 4×L 2 6 1 3
>30.00~50.00 6 6×L 3 8 1.5 4
>50.00~120.00 10 10×L 4 10 2 5
>120.00~150.00 13 13×L 6 12 3 6
>150.00~200.00 15 15×L 7 14 3 6
Table 6 In. mm
Diameter of incircle of
hexagonal-rod
Twist, not larger than
General grade High-precision grade Super-high precision grade
On length of 1
meter
Full length
L/m
On length of 1
meter
Full length
L/m
On length of 1
meter
Full length
L/m
≤14.00 4 4×L 3 3×L 2 2×L
>14.00~38.00 11 11×L 8 8×L 5 5×L
>38.00~100.00 18 18×L 12 12×L 9 9×L
>100.00~150.00 25 25×L — — — —
3.3.6 Length
The permissible length deviation for the bars-rods delivered in specified lengths shall
be. +15mm. The bars-rods supplied in multiple lengths shall include the saw cutting
allowance that shall be calculated according to 5mm per saw cut.
3.4 Mechanical properties
3.4.1 The longitudinal tensile mechanical properties of the bars-rods at room
temperature shall be in accordance with those specified in Table 7. The non-heat
treated aluminium alloy bars-rods at H112, with their properties reach the requirements
of O-condition, may be delivered according to the O-condition. The properties of bars-
rods exceeding the specified scope of Table 7 shall be determined through negotiation
between supplier and demander and shall be indicated in the contract (or order).
deviation of the bars-rods. Where the non-stratified bars-rods, it shall be agreed
between supplier and demander through negotiation and shall be indicated in the
contract (or order).
3.5.5 Where requirement on coarse grain ring is indicated in the contract (or order).
The coarse grain ring depth on the low power test piece shall be in accordance with
those specified in Table 10.
Table 10 In. mm
Designation
Coarse grain ring depth, not larger than
General grade High-precision grade a
2A02 5 —
2A11, 2A12, 2024, 7A04, 7A09, 7A15, 7075 8 3
6A02, 6061, 6082, 2A50, 2A14 8 5
a The high-precision grade is only applicable to the round-rods in diameter of 20.00 mm~120.00 mm and the
square-rods and hexagonal-rods with incircle diameter of 20.00 mm~100.00 mm.
3.6 Microstructure
3.6.1 The microstructure of quenched bars-rods shall be free from over-burning.
3.6.2 The microstructure of bars-rods of 4A11 and 4032 alloys may contain a small
amount of primary silicon, however, the primary silicon shall be of uniform distribution
instead of cluster distribution, and the maximum line size of primary silicon shall not
exceed 0.08mm.
3.7 Ultrasonic inspection
As for the bars-rods requiring ultrasonic inspection, the inspection positions and grades
may be agreed between supplier and demander through negotiation and also shall be
indicated in the contract (or order).
3.8 Surface quality
3.8.1 The bars-rods shall be free from corrosion spots, cracks and gas bubbles in
their surfaces.
3.8.2 The bars-rods may have such defects as load modules with depth not
exceeding the permissible negative deviation of diameter, scratches, oxidation tint,
smooth black and white spots, and straightening traces in their surfaces.
3.8.3 The surface defects of bars-rods may be polished, however, the minimum
diameter or thickness of bars-rods shall be ensured.
4 Test Methods
4.2.3 The diameter or width and thickness of bars-rods shall be measured by the
measuring instrument with accuracy not less than 0.02mm; other dimensions shall be
measured by measuring instruments with corresponding accuracy.
4.3 Mechanical properties
The inspection on the mechanical properties of longitudinal tensile at ambient
temperature for bars-rods shall be carried out according to the method stated in GB/T
228. The inspection on the mechanical properties of persiste...
......
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