GB/T 21832.1-2018 English PDF (GBT21832.1-2018)

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GB/T 21832.1-2018: Welded austenitic-ferritic (duplex) stainless steel tubes and pipes - Part 1: Tubes for heat exchanger
GB/T 21832.1-2018
Welded austenitic-ferritic (duplex) stainless steel tubes and pipes--Part 1. Tubes for heat exchanger
ICS 77.140.75
H48
National Standards of People's Republic of China
Partially replace GB/T 21832-2008
Austenitic-ferritic duplex stainless steel welded steel pipe
Part 1. Tubes for heat exchangers
Published on.2018-05-14
Implementation of.2019-02-01
State Market Supervisory Administration
China National Standardization Administration issued
Foreword
GB/T 21832 "Austenitic-ferritic duplex stainless steel welded steel pipe" is divided into two parts.
---Part 1. Tubes for heat exchangers;
--- Part 2. Tubes for fluid delivery.
This part is the first part of GB/T 21832.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
Part of this part of GB/T 21832 replaces GB/T 21832-2008 "Austenitic-ferritic duplex stainless steel welded steel pipe", not
The replacement is the fluid delivery tube and will be included in Part 2 of GB/T 21832.
The main technical changes in this section compared with GB/T 21832-2008 are as follows.
---Modified the name of the standard;
--- Revised the normative reference document (see Chapter 2, Chapter 2 of the.2008 edition);
--- Removed the classification and code (see Chapter 3 of the.2008 edition);
--- Revised the product size range (see 4.1.1, 5.1.1 of the.2008 version);
--- Revised the tolerance of the outer diameter and wall thickness (see 4.1.2, 5.1.2 of the.2008 edition);
--- Modified the allowable deviation of the length of the fixed length (see 4.2.2, 5.2.2 of the.2008 edition);
--- Revised the steel smelting method (see 5.2.1, 6.2.1 of the.2008 edition);
---Modified the manufacturing method of steel pipe (see 5.2.2, 6.2.2 of.2008 edition);
--- Removed the negotiated delivery status without heat treatment and surface polishing (see 6.3.2 of the.2008 edition);
--- Revised the weld joint back bend test requirements (see 5.5.3,.2008 version 6.5.2);
--- Increased pressure test option underwater air tightness test (see 5.6.2);
--- Revised the requirements of the metallographic organization (see 5.7, 6.7 of the.2008 edition);
--- Removed weld non-destructive testing (see 6.8 of.2008 edition);
--- Removed repair welding (see 6.9.2 of the.2008 edition);
--- Revised the inner and outer weld seam height requirements (see 5.8.3,.2008 version 6.9.3);
--- Removed Appendix A (informative appendix).
This part was proposed by the China Iron and Steel Association.
This part is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This section drafted by. Zhejiang Jiuli Special Materials Technology Co., Ltd., Jiangsu Wujin Stainless Co., Ltd., Shanxi Taigang Stainless Steel
Steel Tube Co., Ltd., Zhejiang Dewei Stainless Steel Pipe Manufacturing Co., Ltd., Harbin Boiler Factory Co., Ltd., Metallurgical Industry Information Standards
Research Institute.
The main drafters of this section. Li Jiequan, Ji Hai, Song Jianxin, Kang Xitang, Shen Genrong, Liang Baoqi, Dong Li, Su Cheng, Chen Zemin, Liu Shanghua,
Mo Peiming, Tan Shuping, Luo Xia, Li Qi.
The previous versions of the standards replaced by this section are.
---GB/T 21832-2008.
Austenitic-ferritic duplex stainless steel welded steel pipe
Part 1. Tubes for heat exchangers
1 Scope
This part of GB/T 21832 specifies the order content, dimensions, and dimensions of austenitic-ferritic duplex stainless steel welded steel tubes for heat exchangers.
Shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificates.
This section applies to austenitic-ferritic duplex stainless steel welded steel tubes (hereinafter referred to as steel pipes) for heat exchangers.
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.
Permissible deviation of chemical composition of finished products of GB/T 222 steel
GB/T 223.11 Determination of chromium content in steels and alloys - either titration or potentiometric titration
GB/T 223.18 Methods for chemical analysis of steels and alloys - Separation of sodium thiosulfate - Iodometric method
GB/T 223.19 Methods for chemical analysis of steels and alloys - s.
GB/T 223.25 Methods for chemical analysis of steels and alloys - s
GB/T 223.26 Determination of molybdenum content of steels and alloys - thiocyanate spectrophotometric method
GB/T 223.28 Determination of molybdenum content by the method of α-benzoin method
GB/T 223.36 Methods for chemical analysis of steels and alloys - Distillation separation - Neutralometric titration
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 223.60 Steel and alloys - Determination of silicon content by perchloric acid dehydration gravimetric method
GB/T 223.62 Methods for chemical analysis of steels and alloys - Determination of phosphorus content by butyl acetate extraction spectrophotometry
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
GB/T 228.1 tensile testing of metallic materials - Part 1
GB/T 230.1 Rockwell hardness test for metallic materials - Part 1. Test methods (A, B, C, D, E, F, G, H, K, N, T scales)
GB/T 231.1 Brinell hardness test for metallic materials - Part 1. Test methods
GB/T 241 metal pipe hydraulic test method
GB/T 245 metal material tube crimping test method
GB/T 246 metal material tube flattening test method
GB/T 2102 steel pipe acceptance, packaging, marking and quality certificate
GB/T 2653 welded joint bending test method
GB/T 2975 steel and steel products mechanical properties test sampling position and sample preparation
GB/T 4340.1 Vickers hardness test for metallic materials - Part 1. Test methods
GB/T 7735-2016 Automatic eddy current testing for seamless and welded (except submerged arc welding) steel pipe defects
GB/T 11170 Determination of multi-element content of stainless steels
Metallographic method for determination of α-phase area content in GB/T 13305 stainless steel
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 21835 welded steel pipe size and unit length weight
3 Ordering content
Contracts or orders for ordering steel pipes in accordance with this section shall include the following.
a) the number of this part;
b) product name;
c) the grade of the steel;
d) size specifications (outer diameter × wall thickness, in millimeters);
e) the quantity ordered;
f) Special requirements.
4 size, shape and weight
4.1 Outer diameter and wall thickness
4.1.1 The outer diameter D of the steel pipe is not more than 203mm, and the wall thickness S is not more than 8.0mm. The size specification shall comply with the provisions of GB/T 21835.
According to the requirements of the purchaser, other steel pipes of outer diameter and wall thickness can be supplied through negotiation between the supplier and the buyer.
4.1.2 The allowable deviation of the outer diameter and wall thickness of the steel pipe shall comply with the requirements of Table 1. According to the requirements of the purchaser, the supplier and the buyer negotiate and in the contract
Note that steel pipes with tolerances outside the dimensions specified in Table 1 may be supplied.
Table 1 The allowable deviation of the outer diameter and wall thickness is in millimeters.
Outer diameter D outer diameter allowable deviation a wall thickness tolerance
a For thin-walled steel pipes with a wall thickness to outer diameter ratio of not more than 3%, the measured average outer diameter of the steel pipe shall comply with the allowable deviation of the outer diameter listed in this table.
4.2 Length
4.2.1 The normal length of steel pipes is 3000mm~12000mm. After consultation between the supplier and the buyer, and stated in the contract, other lengths can be supplied.
Degree of steel pipe.
4.2.2 According to the requirements of the purchaser, after consultation between the supplier and the buyer, and in the contract, the steel pipe can be delivered according to the length of the fixed length or the length of the double. Fixed length steel
The length of the tube is allowed to be 10
0mm. The length of each double rule of the double-footed steel pipe should be 5mm~10mm.
4.3 Bending
The bending of the steel pipe should be no more than 1.5 mm/m.
4.4 Out of roundness
For thin-walled steel pipes with a wall thickness to outer diameter ratio of not more than 3%, the out-of-roundness shall not exceed 1.5% of the nominal outer diameter;
The roundness should not exceed the tolerance of the nominal outer diameter.
4.5 Tip shape
The end faces of the steel pipe should be perpendicular to the axis of the steel pipe, and the burrs of the cut should be removed.
4.6 weight
Steel pipes are delivered according to theoretical weight. After consultation between the supplier and the buyer, and in the contract, the steel pipe can also be delivered according to the actual weight. Steel pipe per meter
The weight is calculated according to formula (1).
W =πρS(DS)/1000 (1)
In the formula.
W --- theoretical weight per meter of steel pipe, in kilograms per meter (kg/m);
π --- take 3.1416;
The density of ρ --- steel, in kilograms per cubic decimeter (kg/dm3), the density of grade 022Cr19Ni5Mo3Si2N is 7.70kg/
Dm3, the density of other grades is 7.80kg/dm3;
D --- outer diameter of steel pipe, the unit is millimeter (mm);
S --- Wall thickness of steel pipe, in millimeters (mm).
5 Technical requirements
5.1 Steel grades and chemical composition
5.1.1 The grade and chemical composition of the steel (melting analysis) shall comply with the requirements of Table 2.
5.1.2 When the purchaser requests the analysis of the finished product, it should be indicated in the contract. The chemical composition allowable deviation of the finished steel pipe shall comply with GB/T 222
Provisions.
5.2 Manufacturing methods
5.2.1 Steel smelting method
Steel should be smelted by electric arc furnace plus furnace refining or converter plus furnace refining method. After consultation between the supplier and the buyer, and indicated in the contract,
Other smelting methods are used.
5.2.2 Manufacturing method of steel pipe
5.2.2.1 Steel pipes shall be manufactured by automatic electrofusion welding without adding filler metal.
5.2.2.2 After consultation between the supplier and the buyer, and indicate in the contract, the steel pipe may be cold after the welding and before the final heat treatment.
Deformation processing.
5.3 Delivery status
The steel pipe shall be delivered in a heat treated and pickled state. Steel pipes heat treated by a protective atmosphere can be delivered without pickling. Recommended hot spot for steel pipes
The management system is shown in Table 3. After consultation between the supplier and the buyer, and in the contract, the steel pipe may adopt other heat treatment systems other than those specified in Table 3.
5.4 Mechanical properties
5.4.1 Stretching
The room temperature longitudinal tensile properties of steel pipes are to comply with the requirements of Table 3.
5.4.2 Hardness
5.4.2.1 According to the requirements of the purchaser, the supplier and the buyer shall negotiate and indicate in the contract that the steel pipe with a wall thickness of not less than 1.7 mm may be used as the base material.
Rockwell hardness or Brinell hardness test. When the contract specifies the hardness test, the hardness value shall comply with the requirements of Table 3.
5.4.2.2 According to the requirements of the purchaser, the supplier and the buyer shall negotiate and indicate in the contract that the steel pipe may also be subjected to Vickers hardness test, and the hardness value shall be provided by
It needs to be determined by both parties.
Table 3 Recommended heat treatment system and mechanical properties
Unite
digital
Code
Brand recommended heat treatment system
Tensile property hardness
tensile strength
Rm/MPa
Prescribed plasticity
Extension strength
Rp0.2/MPa
After breaking
Elongation
A/%
HBW HRC
Not less than not greater than
1 S21953 022Cr19Ni5Mo3Si2N 980°C~1040°C Quenching 630 440 30 290 30
2 S22253 022Cr22Ni5Mo3N 1020°C~1100°C Quenching 620 450 25 290 30
3 S22053 022Cr23Ni5Mo3N 1020°C~1100°C Quenching 655 485 25 290 30
4 S23043 022Cr23Ni4MoCuN 925°C~1050°C
D≤25mm
Quenching
690 450 25 - -
D>25mm
Quenching
600 400 25 290 30
5 S22553 022Cr25Ni6Mo2N 1050°C~1100°C Quenching 690 450 25 280 -
6 S22583 022Cr25Ni7Mo3WCuN 1020°C~1100°C Quenching 690 450 25 290 30
Table 3 (continued)
Unite
digital
Code
Brand recommended heat treatment system
Tensile property hardness
tensile strength
Rm/MPa
Prescribed plasticity
Extension strength
Rp0.2/MPa
After breaking
Elongation
A/%
HBW HRC
Not less than not greater than
7 S25554 03Cr25Ni6Mo3Cu2N ≥1040°C Quenching 760 550 15 297 31
8 S25073 022Cr25Ni7Mo4N 1025°C~1125°C Quenching 800 550 15 300 32
9 S27603 022Cr25Ni7Mo4WCuN 1100°C~1140°C Quenching 750 550 25 300 -
5.5 Process performance
5.5.1 Flattening
The steel pipe shall be subjected to a flattening test. In the flattening test, the weld should be at a position 90° from the direction of application, and the specimen should be pressed to the distance between the two plates.
For H, H...