GB/T 37610-2019 PDF in English
GB/T 37610-2019 (GB/T37610-2019, GBT 37610-2019, GBT37610-2019)
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Corrosion-resistant alloy small diameter precision seamless tubes
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GB/T 37610-2019: PDF in English (GBT 37610-2019) GB/T 37610-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.99;77.140.75
H 59
Corrosion-resistant alloy small diameter precision
seamless tubes
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 ... 4
2 Normative references ... 4
3 Order content ... 6
4 Size, appearance ... 7
5 Technical requirements ... 8
6 Test methods ... 15
7 Inspection rules ... 16
8 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 was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of National Technical Committee
on Steel of Standardization Administration of China (SAC/TC 183).
The drafting organizations of this Standard: Zhejiang Jiuli Special Material
Technology Co., Ltd., Jiangsu Wujin Stainless Co., Ltd., Metallurgical Industry
Information Standards Institute, Yongxing Special Stainless-Steel Co., Ltd.,
Baosteel Special Steel Co., Ltd., Shanxi Taigang Stainless Steel Pipe Co., Ltd.,
Zhejiang Yongshang Special Material Co., Ltd., Shanghai Yilang Alloy Material
Co., Ltd., Harbin Electric Group (Qinhuangdao) Heavy Equipment Co., Ltd.,
Pangang Group Jiangyou Great Wall Special Steel Co., Ltd., Huzhou Sanjing
Cryogenic Equipment Co., Ltd., Fushun Special Steel Co., Ltd.
Main drafters of this Standard: Cai Zhigang, Li Zhengzhou, Yan Chengming,
Ding Jinxian, Wang Jianyong, Ma Mingjuan, Cheng Yiming, FangDewei, Fu
Huaqing, Ye Jinhui, Fang Tie, Jiang Wentao, Wu Bo, Cao Lihong, Cao Ping,
Wu Minghua, Li Peng, Huang Wei.
Corrosion-resistant alloy small diameter precision
seamless tubes
1 Scope
This Standard specifies order content, size, appearance, technical
requirements, test methods, inspection rules, packaging, marks and quality
certificate of corrosion-resistant alloy small diameter precision seamless tubes.
This Standard is applicable to corrosion-resistant alloy cold-rolled (drawn) small
diameter precision seamless tubes such as nickel based, iron nickel based,
pure nickel and nickel copper of which nominal outer diameter is 3mm~30mm,
and wall thickness is 0.3mm~3.0mm (hereinafter referred to as alloy tubes).
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 223.4, Alloyed steel - Determination of manganese content -
Potentiometric or visual titration method
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 223.14, 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 223.17, Methods for chemical analysis of iron, steel and alloy - The
diantipyryl methane photometric method for the determination of titanium
content
GB/T 223.18, Methods for chemical analysis of iron, steel and alloy - The
sodium thiosulfate separation iodometric method for the determination of
copper content
GB/T 223.25, Methods for chemical analysis of iron, steel and alloy - The
dimethylglyoxime gravimetric method for the determination of nickel content
GB/T 223.26, Iron, steel and alloy - Determination of molybdenum content -
The thiocyanate spectrophotometric method
GB/T 223.38, Methods for chemical analysis of iron, steel and alloy - The
anion-exchange separation-gravimetric method for the determination of
niobium content
GB/T 223.43, Iron, steel and alloy - Determination of tungsten content -
Gravimetric method and spectrophotometric method
GB/T 223.62, Methods for chemical analysis of iron, steel and alloy - The
butyl acetate extraction photometric method for the determination of
phosphorus content
GB/T 223.65, Steel, iron and alloy - Determination of cobalt content - Flame
atomic absorption spectrometric method
GB/T 223.70, Iron, steel and alloy - Determination of iron contents - O-
phenanthroline spectrophotometric method
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 228.1, Metallic materials - Tensile testing - Part 1: Method of test at
room temperature
GB/T 228.2, Metallic materials - Tensile testing - Part 2: Method of test at
elevated temperature
GB/T 241, Metal Materials - Tube - Hydrostatic pressure test
GB/T 242, Metal Materials - Tube - Drift-expending test
GB/T 246, Metallic materials - Tube - Flattening test
GB/T 2102, Acceptance, packing, marking and quality certification of steel
pipe
GB/T 5777-2008, Seamless Steel Pipe and Tubing Methods for Ultrasonic
Testing
GB/T 6394, Metal - Methods for estimating the average grain size
GB/T 7735-2016, Automated eddy current testing of seamless and welded
(except submerged arc-welded) steel tubes for detection of imperfections
GB/T 10561-2005, Steel - Determination of Content of Nonmetallic
Inclusions - Micrographic Method Using Standards Diagrams
GB/T 11170, Stainless steel - Determination of multi-element contents -
Spark discharge atomic emission spectrometric method (Routine method)
GB/T 15007, Designations of corrosion-resistant alloy
GB/T 15260-2016, Standard Test Method for Intergranular Corrosion of
Nickel Alloys by Corrosion of Metals and Alloys
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 20125, Low-alloy steel - Determination of multi-element contents -
Inductively coupled plasma atomic emission spectrometric method
YB/T 4395, Steel Determination of molybdenum, niobium and tungsten
contents. Inductively coupled plasma atomic emission spectrometric method
YS/T 325.2, Methods for chemical analysis of nickel-copper alloy - Part 2:
Determination of copper content - Electrolysis weight method
3 Order content
Contract or order for alloy tubes according to this Standard shall at least contain
following information:
a) reference to this Standard;
b) product name;
c) alloy designation;
d) delivery state;
e) specification (outer diameter × wall thickness × length, in millimeters);
f) delivery quantity (total length, total number of pieces or total weight);
g) production method;
h) special requirements.
4 Size, appearance
4.1 Outer diameter and wall thickness
4.1.1 General size of alloy tubes: nominal outer diameter is 3.0mm~30mm, and
nominal wall thickness is 0.3mm~3.0mm.
4.1.2 Unless otherwise specified in contract, alloy tubes are delivered according
to nominal outer diameter (D) and nominal wall thickness (S). Allowable
deviations of nominal outer diameter (D) and nominal wall thickness (S) shall
comply with provisions on Group I in Table 1. According to purchaser’s
requirements and agreed by supplier and purchaser, allowable deviation of
alloy tubes shall be in accordance with requirements for Group II in Table 1.
Table 1 -- Allowable deviations of nominal outer diameter and nominal
wall thickness of alloy tubes
mm
4.1.3 According to purchaser’s requirements and agreed by supplier and
purchaser, when alloy tubes are delivered according to minimum wall thickness
Smin, allowable deviation of minimum wall thickness Smin shall comply with
provisions of Table 2.
Table 2 -- Allowable deviation of minimum wall thickness of alloy tubes
Minimum wall thickness Smin Allowable deviation
0.3~3.0
4.1.4 Agreed by supplier and purchaser, alloy tubes of other specifications
outside Table 1 and Table 2 can be supplied. Allowable deviations shall be
indicated in contract.
Alloy tube size Group I Group II
Nominal outer
diameter D
Nominal wall thickness
4.2 Length
4.2.1 General length
General length of alloy tubes is 1000mm~15000mm. According to purchaser’s
requirements, agreed by supplier and purchaser and indicated in contract, alloy
tubes of other lengths can be supplied.
4.2.2 Fixed length and multiplied length
Agreed by supplier and purchaser and indicated in contract, alloy tubes of fixed
length and multiplied length can be supplied. Fixed length and multiplied length
shall be within general length range. Allowable deviation of fixed length is
mm. Allowable deviation of multiplied length is mm. Each multiple length
shall leave a fracture allowance of 3mm~5mm.
4.3 Degree of curvature
Degree of curvature of alloy tubes shall not exceed 1.5mm/m. Degree of
curvature of full length shall not exceed 0.15% of total length. For alloy tubes of
which length is less than 1000mm, degree of curvature shall not exceed 1mm/m.
Requirements for other degrees of curvature shall be indicated in contract.
4.4 Un-roundness and uneven wall thickness
Un-roundness and uneven wall thickness of alloy tubes shall not exceed 80%
of outer diameter tolerance and wall thickness tolerance, respectively.
4.5 End face shape
End face shapes of both ends of alloy tube shall be perpendicular to axis of
alloy tube. There shall be no burrs on tube ends.
5 Technical requirements
5.1 Designation and chemical composition
5.1.1 Designation and chemical composition (smelting analysis) of alloy tubes
shall comply with provisions of Table 3.
5.1.2 Allowable deviation of chemical composition of finished alloy tubes shall
comply with provisions of GB/T 15007.
Table 3 -- Alloy designation and chemical composition
No
Unified
digital
code
Alloy
designa
tion
Chemical composition (mass fraction)/%
Other
Allowa
nce
Allowa
nce
Allowa
nce
Allowa
nce
Table 3 (continued)
No
Unified
digital
code
Alloy
designa
tion
Chemical composition (mass fraction)/%
Other
Allowa
nce
Allowa
nce
Allowa
nce
Allowa
nce
NOTE: Compositions of P, S of some designations in the table are stricter than GB/T 15007.
5.2 Production method
5.2.1 Smelting method
Alloy shall use electric arc furnace plus outside-furnace refining plus electro-
slag re-melting to smelt. It can also use other methods that be able to meet
requirements of this Standard to smelt. Smelting method shall be indicated in
quality certificate.
5.2.2 Tube production method
5.2.2.1 Alloy ingots for tube production shall be hot-rolled or hot-forged to round
bars. On round bars, parts that are equivalent to alloy ingot head and tail shall
be completely cut off.
5.2.2.2 Round bars shall use hot extrusion method to open blank. Cold-rolling
of alloy tubes shall use cold-rolling (drawing) to produce.
5.3 Delivery state
5.3.1 Alloy tubes shall be delivered in state of protective atmosphere heat
treatment or vacuum heat treatment. See Table 4 for recommended heat
treatment system.
5.3.2 According to purchaser’s requirements, alloy tubes can be delivered in
cold-rolling (drawing) state.
5.4 Mechanical properties
5.4.1 Tensile at room temperature
Longitudinal tensile properties at room temperature of alloy tubes in delivery
state shall comply with provisions of Table 4. Indicators of mechanical
properties of alloy tubes delivered in cold-rolling (drawing) state shall be
determined by supplier and purchaser via negotiation and indicated in contract.
Table 4 -- Recommended heat treatment system and mechanical
properties
Table 4 (continued)
5.4.2 Hardness
Alloy tubes used for instrumentation system shall be subject to hardness test.
Test methods and requirements shall be determined by supplier and purchaser
through negotiation.
No. Unified digital
code
Alloy
designation Recommended heat treatment system
Tensile
strength
Rm/MPa
Specified
plastic
extension
strength
Rp0.2/MPa
Elongation
after break
A/%
Instant cooling
Instant cooling
Instant cooling
Instant cooling
Instant cooling
Instant cooling
Instant cooling
Instant cooling
Instant cooling
Instant cooling
Instant cooling
Instant cooling
Annealing, 870°C~980°C, instant cooling
Quench annealing, 980°C~1150°C, instant cooling
Quench annealing, 940°C~1100°C, instant cooling
Aging treatment, 718°C~760°C, cooling with
furnace
No. Unified digital
code
Alloy
designation
Recommended heat treatment
system
Tensile
strength
Rm/MPa
Specified
plastic
extension
strength
Rp0.2/MPa
Elongation
after break
A/%
Annealing, 815°C~925°C, instant cooling
Stress relief, 480°C~705°C, instant cooling
Annealing,760°C~870°C, instant cooling
Stress relief, 480°C~705°C, instant cooling
Annealing,870°C~980°C, instant cooling
Stress relief, 540°C~565°C, instant cooling
a Steel level 1 uses annealing. Steel level 2 uses quench annealing.
b If NS4301 alloy tubes are delivered in aging treatment state, mechanical properties of quench annealing state
are only used as reference.
c Insulation time shall not be less than 3h.
5.5 Grain size
Average grain size of NS1102, NS1104 alloy tubes shall be level 5 or more
coarse. Average grain size of NS1103, NS1402, and NS3105 alloy tubes shall
be level 5 and finer. Grain size of NS4301 alloy tube shall be level 3 or finer.
Agreed by supplier and purchaser and indicated in contract, requirements for
other grain sizes can be specified.
5.6 Non-metallic inclusions
Inspection of non-metallic inclusions shall be performed on tube blank that is
used to produce tube. Acceptance levels shall comply with provisions of Table
4.
Table 5 -- Acceptance levels for non-metallic inclusions
Types of non-metallic
inclusions
A B C D E
Level, not greater than
Fine series 1.0 1.5 1.5 1.5 1.5 Coarse series 1.0 1.5 1.5 1.5
Sum of levels of A, B, C, D categories shall not exceed level 4.0.
5.7 Process performance
5.7.1 Flaring test
Alloy tubes shall be subject to flaring test. Top core taper of flaring test is 30°
(outer diameter is not more than 10mm) or 60° (outer diameter is more than
10mm). Flaring rate of outer diameter of flared sample shall not be less than
30% of nominal outer diameter. Flared sample shall not have cracks. Alloy
tubes that are delivered in cold-rolling (drawing), that are delivered in stress
relief heat treatment state and aging treatment state, have no requirements for
flaring test.
5.7.2 Flattening test
5.7.2.1 Alloy tubes shall be subject to flattening test. After sample is flattened,
distance between two plates H is calculated according to formula (1)；
Where,
H - Distance between two plates after being flattened, in millimeters (mm);
α - Deformation coefficient of unit length;
S - Nominal wall thickness of alloy tube, in millimeters (mm);
D - Nominal outer diameter of alloy tube, in millimeters (mm).
5.7.2.2 When sample is flattened to distance between two plates H, there shall
be no cracks on surface outside sample. Slight cracks on sample corner shall
not be basis for determination. For alloy tubes that are delivered in cold-rolling
(drawing) state, stress relief heat treatment state and aging treatment state,
there are no requirements for flattening test.
5.8 Ultrasonic testing
5.8.1 For alloy tubes of which nominal outer diameter is not less than 6mm, it
shall perform ultrasonic testing on inner and outer surfaces. Acceptance level
shall comply with provisions on level L2 in GB/T 5777-2008. For alloy tubes of
which nominal outer diameter is less than 6mm, it shall perform ultrasonic
testing for last intermediate straight tube of 6mm or before 6mm. Acceptance
level shall comply with provisions on level L2 in GB/T 5777-2008.
5.8.2 According to purchaser’s requirements, agreed by supplier and purchaser
and indicated in contract, ultrasonic testing can use other acceptance levels.
5.9 Eddy current testing
Alloy tubes shall be subject to eddy current testing. Acceptance level shall
comply with provisions on level E1H in GB/T 7735-2016. Agreed by supplier
and purchaser and indicated in contract, eddy current testing can use other
acceptance levels.
5.10 Surface quality
5.10.1 There shall be no defects such as cracks, folds, rolls, separation and
crusting on inner and outer surfaces of alloy tubes. These defects shall be
cleared. Surface of alloy tube at clearing shall be smooth, without edges and
corners. Actual wall thickness at clearing shall not be less than minimum value
allowed by wall thickness.
5.10.2 Other slight surface scratches, straightening stamps, and cold rolling
waves that do not exceed allowable deviation are allowed. On outer surface of
alloy tube, allowable scratch depth is not greater than 3% of nominal wall
thickness or 0.05mm. Take the larger of two.
5.10.3 For tubes used for instrumentation system, outer surface roughness Ra
shall not exceed 0.80μm.
5.10.4 Inner and outer surfaces of alloy tubes shall be clean. There shall be no
foreign matter such as oil, dust and debris. There shall be no corrosive medium
such as residual acid or lye.
5.11 Special requirements
According to purchaser’s requirements, agreed by supplier and purchaser and
indicated in contract, it shall perform following inspections to alloy tubes:
a) high-temperature tensile test;
b) hydraulic test or underwater airtight test;
c) intergranular corrosion test;
d) other pressure test;
e) delivery in other heat treatment systems;
f) others.
6 Test methods
6.1 Inspection items and test methods of alloy tubes shall comply with
provisions of Table 6.
6.2 Chemical composition analysis of alloy tubes is in accordance with general
methods such as GB/T 223.79, GB/T 11170, GB/T 20123, GB/T 20125. But in
arbitration, it is in accordance with provisions of GB/T 223.4, GB/T 223.5, GB/T
223.11, GB/T 223.14, GB/T 223.17, GB/T 223.18, GB/T 223.25, GB/T 223.26,
GB/T 223.38, GB/T 223.43, GB/T 223.62, GB/T 223.65, GB/T 223.70, GB/T
223.81, YB/T 4395, YS/T 325.2.
6.3 Underwater airtight test medium is compressed air. Test pressure shall be
0.6MPa~0.8MPa. Voltage regulation time shall be no less than 5s.
6.4 Visually inspect inner and outer surface qualities of alloy tubes under full
lighting conditions. Use roughness tester to test surface roughness or use
roughness comparison test block to perform visual inspection.
6.5 Use measuring tool that meets accuracy requirements to measure size and
appearance of alloy tube.
Table 6 -- Inspection items, sampling quantity, sampling methods and
test methods of alloy tubes
No. Inspection item Sampling quantity Sampling site and method Test method
1 Chemical composition 1/furnace GB/T 20066 See 6.2
2 Tensile at room temperature 2/batch
On different alloy tube,
take full-sectional sample GB/T 228.1
3 Hardness 2/batch On different alloy tube Agreed by both parties
4 Grain size 1/batch On any alloy tube, GB/T 6394 GB/T 6394
5 Non-metallic inclusion 2/furnace
On tube blank that is
equivalent to alloy ingot
head, tail parts, GB/T
10561-2005
Method A in
GB/T 10561-
2005
6 Flaring test 2/batch On different alloy tube, GB/T 242 GB/T 242
7 Flattening test 2/batch On different alloy tube, GB/T 246 GB/T 246
8 Ultrasonic testing Piece by piece - GB/T 5777
9 Eddy current testing Piece by piece - GB/T 7735
10 High-temperature tensile 2/batch On different alloy tube, take full-sectional sample GB/T 228.2
11 Intergranular corrosion 2/batch On different alloy tube, GB/T 15260-2016
GB/T 15260-
2016
12 Hydraulic pressure
2%/batch
and not
less than 2
pieces
- GB/T 241
13 Air tightness
2%/batch
and not
less than 2
pieces
- See 6.3
14 Surface quality
2%/batch
and not
less than 2
pieces
- See 6.4
15 Size, appearance Piece by piece - See 6.5
7 Inspection rules
7.1 Inspection and acceptance
Inspection and acceptance of alloy tubes are carried out by supplier’s technical
quality supervision department. Purchaser has right to inspect and accept alloy
tubes according to provisions of this Standard.
7.2 Batching rules
Alloy tubes are inspected and accepted in batches. Each batch shall consist of
alloy tubes of same designation, same furnace number, same specification,
same production method and same heat treatment system (or furnace time).
7.3 Sampling quantity and sampling site
Sampling quantity and sampling site of alloy tubes shall comply with provisions
of Table 6.
7.4 Re-inspection and determination rules
Re-inspection and determination rules of alloy tubes shall comply with
provisions of GB/T 2102. It is allowed to re-perform heat treatment (not
exceeding twice) to alloy tubes that re-inspection result is rejected, as a new
batch submitted for acceptance. Re-performance of heat treatment shall be
indicated in quality certificate.
8 Packaging, marks and quality certificate
Packaging, marks and quality certificate of alloy tubes shall comply with
provisions of GB/T 2102.
__________ END __________
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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