Chinese Standards Shop Partner of Google-Books Database: 169760 (Sep 14, 2019)
 HOME   Quotation   Tax   Examples Standard-List   Contact-Us   View-Cart
  

GB/T 20409-2018

Search Result of Chinese Standard: 'GB/T 20409-2018'
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusRelated Standard
GB/T 20409-2018English359 ASK Days<=4 Seamless multi-rifled steel tubes for high-pressure boiler Valid GB/T 20409-2018
GB/T 20409-2018Chinese16 Add to Cart <=1-day [PDF from Chinese Authority, or Standard Committee, or Publishing House]  

   
Detail Information of GB/T 20409-2018; GB/T20409-2018
Description (Translated English): Seamless multi-rifled steel tubes for high-pressure boiler
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H48
Classification of International Standard: 77.140.75
Word Count Estimation: 20,293
Date of Issue: 2018-05-14
Date of Implementation: 2019-02-01
Older Standard (superseded by this standard): GB/T 20409-2006
Quoted Standard: GB/T 223.5; GB/T 223.9; GB/T 223.11; GB/T 223.14; GB/T 223.19; GB/T 223.23; GB/T 223.26; GB/T 223.30; GB/T 223.36; GB/T 223.40; GB/T 223.43; GB/T 223.58; GB/T 223.59; GB/T 223.68; GB/T 223.69; GB/T 223.78; GB/T 223.84; GB/T 223.85; GB/T 223.86; GB/T 224
Drafting Organization: Changzhou Changbao Jingte Steel Tube Co., Ltd.
Administrative Organization: National Steel Standardization Technical Committee
Regulation (derived from): National Standards Announcement No. 6 of 2018
Proposing organization: China Iron and Steel Association
Issuing agency(ies): State Administration of Markets and China National Standardization Administration
Summary: This standard specifies the classification and code number, ordering content, size, shape and weight, technical requirements, test methods, inspection rules, packaging, markings and quality certificates for seamless steel tubes with internal threads for high pressure boilers. This standard applies to cold-drawn or cold-rolled internal thread seamless steel tubes (hereinafter referred to as internally threaded tubes) for the manufacture of high pressure and high pressure boilers.

GB/T 20409-2018
Seamless multi-rifled steel tubes for high-pressure boiler
ICS 77.140.75
H48
National Standards of People's Republic of China
Replace GB/T 20409-2006
Internal thread seamless steel pipe for high pressure boiler
Published on.2018-05-14
Implementation of.2019-02-01
State market supervision and administration
China National Standardization Administration issued
Content
Foreword III
1 range 1
2 Normative references 1
3 Classification and code 2
4 Ordering content 3
5 size, shape and weight 3
5.1 Dimensions 3
5.2 Dimensions and thread parameters allowable deviation 7
5.3 Length 7
5.4 Bending 8
5.5 Out of roundness and wall thickness unevenness 8
5.6 Tip shape 8
5.7 weight 8
6 Technical requirements 8
6.1 Steel grade and chemical composition 8
6.2 Manufacturing Method 10
6.3 Delivery status 10
6.4 Mechanical properties 10
6.5 Process performance 11
6.6 Hydraulic test 12
6.7 Microstructure 13
6.8 grain size 13
6.9 Decarburization layer 13
6.10 Surface quality 13
6.11 Nondestructive testing 13
7 Test method 14
8 Inspection rules 14
8.1 Inspection and acceptance 14
8.2 Group Batch Rule 14
8.3 Number of samples 15
8.4 Re-inspection and determination rules 15
9 Packaging, Marking and Quality Certificate 15
Appendix A (informative) The theoretical weight of the internally threaded pipe 16
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 20409-2006 "internal thread seamless steel pipe for high pressure boiler", compared with GB/T 20409-2006, mainly
The technical changes are as follows.
--- Added OM thread type (see 3.1);
--- Modified the illustration of the internally threaded tube, adding a side view of the internally threaded tube tooth type (see Chapter 3 of 3.2,.2006 edition);
--- Added the code and description of the internally threaded pipe (see 3.3);
--- Increased the size and thread parameters of the OM type internally threaded pipe (see 5.1);
--- Modified the internal thread tube size and thread parameter tolerance requirements (see 5.2,.2006 version 5.2);
--- Revised the length deviation requirement (see 5.3, 5.3 of the.2006 edition);
--- Increased out-of-roundness and uneven wall thickness requirements (see 5.5);
--- Removed the tag example (see 5.7 of the.2006 edition);
--- Increased steel grades 12Cr2MoG, 12Cr1MoVG, 10Cr9Mo1VNbN, 10Cr9MoW2VNbBN (see 6.1);
--- Revised chemical composition requirements (see 6.1,.2006 version 6.1);
--- Removed the manufacturing method of steel and tube blanks (see 6.2.1 of.2006 edition);
--- Increased pipe requirements and cold rolling processing methods (see 6.2);
--- Revised the requirements of the heat treatment system (see 6.3, 6.3 of the.2006 edition);
---Modified the mechanical properties requirements (see 6.4.1, 6.4.1 of the.2006 edition);
--- Increased hardness test requirements (see 6.4.3);
--- Revised the impact test requirements (see 6.4.4, 6.4.1 of the.2006 edition);
--- Revised the requirements for the flattening test (see 6.5.1, 6.5.1 of the.2006 edition);
--- Increased flaring test requirements (see 6.5.2);
---Modified hydraulic test requirements (see 6.6,.2006 version 6.5.2);
--- Revised the microstructure requirements (see 6.7,.2006 version 6.6.1);
--- Revised grain size requirements (see 6.8,.2006 version 6.6.2);
--- Revised the decarburization layer requirements (see 6.6.3,.2006 version 6.63);
--- Revised surface quality requirements (see 6.10,.2006 version 6.7);
--- Modified non-destructive testing requirements (see 6.11,.2006 version 6.8);
--- Revised test methods (see 7.1, 7.2 and 7.4,.2006 editions 7.1 and 7.3);
--- Revised inspection rules (see 8.2 and 8.4,.2006 editions 8.2 and 8.4).
This standard was proposed by the China Iron and Steel Association.
This standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This standard was drafted. Changzhou Changbao Jingte Steel Tube Co., Ltd., Shanghai Shaped Steel Tube Co., Ltd., Steel Research Institute
Company, Harbin Boiler Factory Co., Ltd., Dongfang Electric Group Dongfang Boiler Co., Ltd., Shanghai Boiler Factory Co., Ltd., Metallurgy
Industrial Information Standards Institute.
The main drafters of this standard. Jin Yuzhong, Zhong Chao, Gao Zhijian, Song Zhimin, Wu Yi, Tan Shuping, Yang Xiaochuan, Wang Yuxiang, Dong Li, Zhao Caigang,
Liang Baoqi, Li Qi.
The previous versions of the standards replaced by this standard are.
---GB/T 20409-2006.
Internal thread seamless steel pipe for high pressure boiler
1 Scope
This standard specifies the classification and code, order content, size, shape and weight, technical requirements, internal thread seamless steel pipe for high pressure boilers,
Test methods, inspection rules, packaging, marking and quality certificates.
This standard is applicable to the production of cold drawn or cold rolled internal thread seamless steel tubes (hereinafter referred to as internal threaded tubes) for pressure vessels with high pressure and above.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 223.5 Determination of acid-dissolved silicon and total silicon content - Reducing silyl molybdate spectrophotometric method
GB/T 223.9 Determination of aluminium content of steels and alloys - chrome azure S spectrophotometric method
GB/T 223.11 Determination of chromium content in steels and alloys - either titration or potentiometric titration
GB/T 223.14 Methods for chemical analysis of steels and alloys - Determination of vanadium content by extraction spectrophotometric method
GB/T 223.19 Methods for chemical analysis of steels and alloys - s.
GB/T 223.23 Determination of nickel content in steels and alloys - succinimide spectrophotometric method
GB/T 223.26 Determination of molybdenum content of steels and alloys - thiocyanate spectrophotometric method
GB/T 223.30 Steel and alloy chemical analysis method - Determination of bromomandelic acid precipitation - arsenazo III spectrophotometric method
Zirconium amount
GB/T 223.36 Methods for chemical analysis of steels and alloys - Distillation separation - Neutralometric titration
GB/T 223.40 Determination of bismuth content of steels and alloys
GB/T 223.43 Determination of tungsten content of steels and alloys - Gravimetric method and spectrophotometric method
GB/T 223.58 Determination of manganese content - Sodium arsenite - Sodium nitrite titration method
GB/T 223.59 Determination of phosphorus content in steels and alloys - phosphine molybdenum blue spectrophotometric method and bismuth phosphomolybdate blue spectrophotometric method
GB/T 223.68 Steel and alloy chemical analysis method - Determination of sulfur content by potassium iodate titration after combustion in tubular furnace
GB/T 223.69 Determination of carbon content of steels and alloys
GB/T 223.78 Determination of boron content by direct photometric method with curcumin
GB/T 223.84 Determination of titanium content in steels and alloys - Diantipymethylene methane spectrophotometric method
GB/T 223.85 Determination of sulfur content of steel and alloys - Infrared absorption method after induction furnace combustion
GB/T 223.86 Determination of total carbon content of steels and alloys - Infrared absorption method after induction furnace combustion
Detachment layer depth determination method for GB/T 224 steel
GB/T 228.1 tensile testing of metallic materials - Part 1
GB/T 229 metal material Charpy pendulum impact test method
GB/T 231.1 Brinell hardness test for metallic materials - Part 1. Test methods
GB/T 241 metal pipe hydraulic test method
GB/T 242 metal pipe flaring test method
GB/T 246 metal material tube flattening test method
GB/T 2102 steel pipe acceptance, packaging, marking and quality certificate
GB/T 2975 steel and steel products mechanical properties test sampling position and sample preparation
GB/T 4336 Determination of multi-element content of carbon steel and medium-low alloy steels by spark discharge atomic emission spectrometry (conventional method)
GB/T 4340.1 Vickers hardness test for metallic materials - Part 1. Test methods
GB/T 5310 seamless steel pipe for high pressure boiler
GB/T 5777-2008 Seamless steel tube ultrasonic flaw detection method
GB/T 6394 method for determination of average grain size of metals
GB/T 7735-2016 Automatic eddy current testing for seamless and welded (except submerged arc welding) steel pipe defects
GB/T 13298 metal microstructure inspection method
GB/T 20066 Sampling and sample preparation method for samples for determination of chemical composition of steel and iron
GB/T 20123 Determination of total carbon and sulfur content of steels - Infrared absorption method after high-frequency induction furnace combustion (conventional method)
GB/T 20124 Determination of nitrogen content of steels - Insulating gas fusion heat conduction method (conventional method)
GB/T 31925-2015 Ultrasonic inspection method for thick-walled seamless steel tubes
YB/T 5137 high pressure hot rolled and forged seamless steel tube round billet
3 classification and code
3.1 The internal threaded pipe of this standard is divided into the following three categories according to the tooth type.
a) Type A. the helix angle is 30°, the thread side angle is 55°, and the thread top width (axial direction) is 8.28 mm;
b) Type B. the helix angle is 30°, the thread side angle is 50°, and the thread top width (axial direction) is 5.6mm or 6.64mm;
c) OM type. the helix angle is 40°, the thread side angle is 55°, the thread top width (axial direction) is 5.4mm or 5.6mm, the thread side
The height of the straight section is not less than 60% of the height of the thread.
3.2 The internal threaded tooth profile is shown in Figure 1, and the toothed side is shown in Figure 2.
Description.
I --- thread top width (circumferential); T --- thread top width (axial);
N---thread lead; U --- thread top groove width (axial);
M---thread pitch (thread pitch equals thread lead divided by number of threads); Q --- helix angle;
S --- nominal wall thickness; E --- minimum inner diameter;
K---thread side angle; C --- thread root diameter;
J --- thread height; D --- outer diameter.
O --- thread root radius;
Figure 1 Schematic diagram of internal threaded pipe
Description.
O --- thread root radius;
v --- the height of the arc transition between the side of the thread and the top of the thread;
h --- the height of the straight side of the thread side;
w---the height of the arc transition between the side of the thread and the bottom of the thread;
J --- thread height.
Figure 2 Schematic diagram of the inner side of the internally threaded pipe
3.3 The following codes apply to this standard.
D outer diameter (if not specified, including nominal outer diameter and/or calculated outer diameter)
Smin minimum wall thickness
Sc average wall thickness (wall thickness calculated by dividing the difference between the outer diameter and the inner diameter of the root of the thread)
G thread number
4 Ordering content
Contracts or orders for ordering internally threaded pipes in accordance with this standard shall include, but are not limited to, the following.
a) standard number;
b) product name;
c) the grade of the steel;
d) size specifications;
e) thread tooth type;
f) the quantity ordered (weight or length);
g) Special requirements.
5 size, shape and weight
5.1 Dimensions
5.1.1 The internally threaded pipe is delivered in nominal outer diameter and minimum wall thickness. According to the requirements of the purchaser, after consultation between the supplier and the buyer, the internally threaded pipe can be used according to other rulers.
Delivery in inch format.
5.1.2 Dimensions and thread parameters of A, B and OM internal threaded pipes shall comply with the requirements of Table 1, Table 2 and Table 3, respectively.
According to the requirements of the purchaser, the internal threaded pipe of other specifications specified in Table 1, Table 2 and Table 3 may be used for negotiation between the supplier and the buyer.
6.7 Microstructure
The microstructure of the threaded pipe in the delivery state shall comply with the following requirements.
a) 20G, 20MnG, 25MnG should be ferrite plus pearlite;
b) 12CrMoG, 15CrMoG should be ferrite plus pearlite, allowing the presence of granular bainite, there should be no critical temperature of phase transformation
Incomplete phase transition product between Ac1~Ac3 (such as yellow block structure);
c) 12Cr2MoG and 12Cr1MoVG should be ferrite plus granular bainite, or ferrite plus pearlite, or ferrite plus granular shell
The pearlite is added with pearlite; there should be no incomplete phase transition product (such as yellow block structure) between the critical temperature of the phase change Ac1~Ac3;
d) 10Cr9Mo1VNbN and 10Cr9MoW2VNbBN shall be tempered martensite or tempered sorbite retaining the martensite phase.
6.8 grain size
The actual grain size of the threaded pipe in the delivery state shall comply with the requirements of Table 10.
Table 10 Grain size of finished threaded pipe
No. Material grade grain size level The maximum grain size and the minimum level difference between the two test pieces
20G, 20MnG, 25MnG, 12CrMoG, 15CrMoG,
12Cr2MoG, 12Cr1MoVG
Level 4 to level 10 does not exceed level 3
2 10Cr9Mo1VNbN, 10Cr9MoW2VNbBN ≥4 b no more than 3
a Grain size maximum and minimum level difference algorithm example. the minimum is 6 levels, the maximum is 8 levels, the difference is 3 levels; the minimum is 6 levels, the maximum is 9 levels, the difference is
level 4.
b When the microstructure is martensite, the original austenite grain size can be checked, and its grade should be no less than 2 grades.
6.9 Decarburization layer
The finished internally threaded pipe with an outer diameter of not more than 76mm shall be inspected for the full decarburization layer, and the depth of the entire decarburized layer on the outer surface shall not exceed 0.2mm.
The depth of the surface full decarburization layer should be no more than 0.3mm, and the sum of the two should be no more than 0.4mm.
6.10 Surface quality
6.10.1 The inner and outer surfaces of the internally threaded pipe shall be free from cracks, folds, crusting, rolling and separation. These defects shall be completely removed and the depth of defect removal shall be
Should not exceed 10% of the wall thickness, the actual wall thickness at the defect removal should not be less than the minimum allowed by the wall thickness deviation, and the clearing should be a smooth transition.
6.10.2 The shape of the thread shall remain intact and there shall be no drawing, curling or sag.
6.10.3 The inner and outer surfaces of the internally threaded pipe (including non-sharp mandrel scratches) shall be allowed to have a depth not greater than 4% of the minimum wall thickness and the maximum
It is 0.2mm.
6.10.4 Other partial imperfections that do not exceed the wall thickness to allow negative deviations are allowed.
6.10.5 The scale of the inner and outer surfaces of the internally threaded pipe shall be removed, and the oxidized thin layer that does not interfere with the inspection shall be allowed to exist.
6.11 Non-destructive testing
6.11.1 The internally threaded pipe shall be ultrasonically tested throughout its length and shall comply with the following requirements.
a) When S/D ≤ 0.2, ultrasonic testing shall be carried out in accordance with the provisions of GB/T 5777-2008.
The groove depth level should be L2;
b) When S/D>0.2 and S/D<0.3, ultrasonic testing shall be carried out according to the provisions of GB/T 31925-2015.
The surface of the sample tube has a longitudinal groove depth grade of U2;
c) When the internally threaded pipe is delivered at the minimum wall thickness, the groove depth of the comparative sample pipe is calculated as the average wall thickness of the steel pipe.
6.11.2 According to the requirements of the purchaser, other non-destructive tests may be added after consultation between the supplier and the buyer and indicated in the contract.
7 Test methods
7.1 The chemical composition analysis of the internally threaded pipe shall be carried out according to the rules of GB/T 20066, and the chemical composition analysis shall be generally in accordance with GB/T 4336.
GB/T 20123, GB/T 20124 or other common methods, arbitration should be in accordance with GB/T 223.5, GB/T 223.9, GB/T 223.11
GB/T 223.14, GB/T 223.19, GB/T 223.23, GB/T 223.26, GB/T 223.30, GB/T 223.36, GB/T 223.40,
GB/T 223.43, GB/T 223.58, GB/T 223.59, GB/T 223.68, GB/T 223.69, GB/T 223.78, GB/T 223.84,
The provisions of GB/T 223.85 and GB/T 223.86 are carried out.
7.2 The thread parameters of the internally threaded pipe shall be not less than the interception length of the same specification, the same production process and no more than.200
The sample tube with two thread pitches is measured by a gage that meets the accuracy requirements after cutting. Other dimensions of the internally threaded pipe shall be in accordance with the accuracy
The gauges are measured one by one.
7.3 The inner and outer surface quality of the internally threaded pipe shall be visually inspected under full lighting conditions.
7.4 Sampling methods and test methods for other inspection items of internally threaded pipes are to comply with the requirements of Table 11.
Table 11 Inspection items, sampling quantity, sampling method and test method of internal threaded pipe
Serial number test item sampling quantity sampling method test method
1 Chemical composition 1 sample per furnace GB/T 20066 See 7.1
2 Stretching at room temperature, each batch takes 1 sample on each of the two steel pipes GB/T 2975 GB/T 228.1
3 Hardness One batch of each sample on each of the two steel pipes GB/T 231.1, GB/T 4340.1 GB/T 231.1, GB/T 4340.1
4 Impact Each batch takes a set of 3 samples on each of the two steel pipes GB/T 2975 GB/T 229
5 Squeeze each batch of one sample on each of the two steel pipes GB/T 246 GB/T 246
6 Flare, one batch of each sample on each of the two steel pipes GB/T 242 GB/T 242
7 hydraulic pressure by root - GB/T 241
8 Microstructure Each batch of one sample on each of the two steel pipes GB/T 13298 GB/T 13298
9 Grain size One sample per batch on two steel pipes GB/T 6394 GB/T 6394
10 Decarburization layer Each batch takes 1 sample on each of the two steel pipes GB/T 224 GB/T 224
11 Eddy current testing by root - GB/T 7735-2016
12 Ultrasound detection by root -
GB/T 5777-2008,
GB/T 31925-2015
8 Inspection rules
8.1 Inspection and acceptance
The inspection and acceptance of the internally threaded pipe shall be carried out by the supplier's quality and technical supervision department.
8.2 Group Batch Rules
The chemical composition of the internally threaded pipe shall be inspected and accepted according to the melting furnace. The remaining inspection items of the internally threaded pipe shall be inspected and accepted in batches, each batch.
It shall consist of internally threaded pipes of the same grade, the same heat number, the same specification and the same heat treatment system (heating). The number of internally threaded pipes per batch should be
Not more than.200.
8.3 Number of samples
The number of samples for the internal threaded pipe inspection shall comply with the requirements of Table 11.
8.4 Re-inspection and decision rules
The re-inspection and determination rules of the internally threaded pipe shall comply with the provisions of GB/T 2102.
9 Packaging, marking and quality certificate
The packaging, marking and quality certificate of the internally threaded pipe shall comply with the provisions of GB/T 2102.
Appendix A
(informative appendix)
Theoretical weight of internally threaded pipe
The theoretical weight of the internally threaded pipe is given in Table A.1. The theoretical weight per metre of the internally threaded pipe (the density of the steel is 7.85kg/dm3) according to the formula (A.1)
Calculation.
Z=0.00785πD-S( )S GJ I (tanQ/tanK)J[ ]{ } (A.1)
In the formula.
Z --- theoretical weight per meter of internal threaded pipe, in kilograms per meter (kg/m);
D---outer diameter, in millimeters (mm);
S --- nominal wall thickness (average wall thickness) in millimeters (mm);
G---number of threaded heads;
I --- Thread top width (circumferential) in millimeters (mm);
Q---spiral angle, in degrees (°);
J --- thread height in millimeters (mm);
K---The angle of the side of the thread, in degrees (°).
Table A.1 Theoretical weight of internally threaded pipe
Related standard:   GB/T 35990-2018  GB/T 21832.1-2018
   
 
Privacy   ···   Product Quality   ···   About Us   ···   Refund Policy   ···   Fair Trading   ···   Quick Response
Field Test Asia Limited | Taxed in Singapore: 201302277C | Copyright 2012-2019