Some standard content:
Ministry of Chemical Industry
Engineering Construction Standards
Chemical Process Piping of Ministry of Chemical Industry
Design Technology Center Station
Steel Butt-Welded Pipe Fittings
Ministry of Chemical Industry
May 1991
Engineering Construction Standards
HGJ528--90
This standard applies to pipe fittings with longitudinal welds made of carbon steel, low alloy steel and austenitic stainless steel plates, including tees (equal diameter and reducing diameter), elbows (short radius 90 and long radius 90°, 45\), and reducers (concentric and eccentric): divided into two series: I and straight.
According to the current domestic production needs and manufacturing possibilities, the diameter ranges of three types of pipe fittings are determined: the nominal diameters of equal (reducing) tee main pipes, elbows, and the large ends of the reducing pipes range from 300 to 1000mm (12″~40\), and the nominal diameters of the small ends of the reducing tee branches and reducing pipes range from 150 to 900mm (6\~36\). The wall thickness series of pipe fittings are listed in Table A1 and Table A2 in Appendix A for reference by manufacturers and users. The units used in this standard are: length is mm, in; pressure is MPa. 2
Equal diameter tee
Nominal diameter
HGJ·528-90
Table 1 Equal diameter tee series dimensions
End outer diameter
I Series
I Series
Reducing Tee
Distance from Center to End Face
Nominal Diameter
300×300×250
300×300×200
300×300×150
350×350×300
350×350×250
350×350×200
400×400×350
400×400×300
400×400×250
400×400×200
（450X450×400 ) | | tt | ×250 | |(650×650×600)
(650×650×500)
HGJ528—90
Table 2 Reducing tee series dimensions
I series
12×12×10
12×12×8
12×12×6
14×14×1 2
14×14×10
14×14×8
16×16×14
16×16×12
16×16×10
18×18×16
18×18×14||t t||18×18×12
18X18×10
20×20×16
20×20×14
20×20×12
22×22×20
22X22×16
22×22× 14
24 × 24 × 20 ||tt | (650) × 650 × 400 | | tt | | 700 × 700 × 600 | | tt | | 700 × 700 × 500 | | tt | | 700 × 700 × 400 | | tt | t||800 × 800X700 ||tt | 800 | | tt | 00 × 1000 × 800 | | tt | | 1000 × 1000 × 700 | | tt | | 26 × 26 × 16 | | tt | | 28 × 28 × 24 | | tt | ||30×30×16
32×32×28
32×32×24
32×32×20
31×34×32
34×34×28
34×34×24
36×36×32
36×36×28
36×36×24
38×38×32
38×38×28
38×38×24
40X40X36
40×40X32
40×40×28
Note: The values in brackets are not recommended. 172
HGJ528—-90
Continued Table 2
I Series
1 Series
I Series
Straight Series
Center to End Face Distance
95 Wide Head (Long Radius
HGJ528—90
S0° Head (Short Semi-Light)
Table 345° Elbow, 90° Li Head Series Dimensions Nominal Diameter
End Outer Diameter
I Series
1 Series
90 Elbow (Long Radius)
Center to End Face Distance
45° Bay Head B
Long Radius
90° Elbow A
Short Flat Diameter
90 Elbow A.
Long radius
Nominal diameter
300×250
300×200
300×150
350X300
350×250
350×200bzxZ.net
400×350
400×300
400×250
(450×400)
(450×350)
(450×300)
500×450
500×400
500×350
(550×500)
(550×450)
(550×400)
600 ×550
·174·
HGJ528- 90 | |tt |
20×18
20×16||tt ||20×14
22×20
22×18
22×16
24×22
1 Series
I Series
I Series
End to end
Nominal diameter
600×500
600×450
650×550）
（650×45 0)
(650×400)
700×600
700×500
700×450
(750×650)
(750×550)
(750×500)
800×700
80 0×600
800×550
(850× 750)
(850×650)
(850X550)
900×800
900×700
900X600
(950X850)
(950×750)
(950×650)||t t||1000×900
1000×800
1000 × 700 | | tt | | 24 × 20 | | tt | | 24 × 18 | ||32×28
32×24
32×22
34×30
34×26
34×22
36×32
36×28
36×24
38×34
38×30
38×26
40×36
40×32| |tt||40×28
Note: The values in brackets are not recommended for use. I series
HGJ528-90
Continued Table 4
1 series
: 920
1 series
1 series
End to end
610:
HGJ528—90
In order to ensure the quality of assembly and welding, the allowable deviations of the main dimensions of pipe fittings are specified as follows (see Table 5) Table 5 Main dimensional deviations of formed pipe fittings
Types of pipe fittings
End outer diameter End inner diameter
Nominal diameter DN
45 Elbow
90·Retail
Center to face
End face A
Note, 1. The roundness is the sum of the absolute values of the positive and negative diameter deviations. 3.
Deviation from center to end face
2, specified by end inner diameter deviation or end thickness deviation of pipe. ·176.
Verticality
Deviation P
Reducing pipe
End face room
End length
HGJ528-90
Bevel at the end of the pipe fitting
The shape and finish of the bevel are shown in the figure below. When the inner diameter of the end is different from that of the pipe!
When the inner diameter of the end is the same as the
connecting pipe
111.6±0.8
Outer diameter of the end of the pipe fitting Do or do
5'±2.5°
Twice the wall thickness of the connecting pipe proposed by the buyer
The wall thickness of the end of the pipe fitting manufactured according to this standard is
Outer diameter of the end of the pipe fitting D. or d.
8 Technical requirements
[The overall thickness of the connecting pipe proposed by the buyer
37.5°±2.5
Circular diameter
8.1 Materials
8.1.1 The raw material for manufacturing butt-welded pipe fittings is steel plate. Its common material grades and the standards to be met are listed in Table 6. According to user requirements, pipe fittings can also be made of other materials not listed in the table. Table 6 Material grades and related standards
20 steel, 16Mn
12 Cr Mo, 15Cr Mo
12Cr1Moy
0Cr19Ni9
Cr18Nig
1Cr18Ni9Ti
Standard number and standard name
GB3274: Ordinary carbon structural steel and low alloy steel hot rolled raw steel plate and steel strip GB912
Technical conditions for ordinary carbon structural steel and low alloy steel thin plate GB66554E
Carbon steel and low alloy steel thick steel plate for pressure vessels GB713
Carbon steel and low alloy steel plates for saw furnaces
GB11251Alloy structural steel, hot-rolled original steel platesGB3280Stainless steel cold-rolled steel plates
GB4237
Stainless steel hot-rolled steel plates
HGJ528-90
8.12The steel plates used for butt-welded pipe fittings must have a quality certificate and should be retested for chemical analysis and mechanical properties according to the requirements of relevant standards and specifications. They can only be used after being confirmed to be qualified. 8.1.3There shall be no cracks, folds, roll folds, delamination, hairline and scar defects on both sides of the steel plate. These defects should be completely removed, and the wall thickness after removal should meet the negative deviation requirements of the steel plate. 8.1.4 The chemical analysis and mechanical properties of the steel plate shall be retested according to the following standards: GB222, GB223 Chemical analysis of steel:
Metal tensile test method:
Metal Charpy impact test method
Metal Brinell hardness test method.
8.1.5 Welding materials shall have a qualified chemical composition analysis report and require retesting to confirm that they meet the requirements of the following standards:
GB511:
GB5118
8.2 Manufacturing requirements
Carbon steel welding rod:
Low alloy steel welding rod;
Stainless steel welding rod.
8.2.1 The manufacture of tees may allow one or two longitudinal welds on the main pipe according to the nominal diameter and manufacturing process. For a pipe with one longitudinal weld, the branch pipe is first extruded, and the main pipe is pressed and formed before welding. For a pipe with two longitudinal welds, the branch pipe is first extruded from the upper part, and then pressed and formed. The lower part is pressed and formed before welding with the upper part (see the figure below).
Lower part
Two straight lines
One straight line
8.2.2 After the tee branch pipe is pressed and formed, the thickening on both sides should be guaranteed to be consistent. The wall thickness of the shoulder fillet transition part should be guaranteed to be no less than the wall thickness of the end interface.
8.2.3 The elbow is formed by steel plate stamping, and the wall thickness of the arc transition part is guaranteed to be uniform. Generally, single welding is adopted, and two longitudinal welds are allowed.
8.2.4 The reducer is rolled or stamped by steel plate. According to the nominal diameter size and manufacturing process, one or two longitudinal welds are allowed.
8.2.5 The welding of the longitudinal weld of the pipe fittings shall be double-sided welding. The weld shall be well formed and the transition shall be smooth. There shall be no defects such as cracks, pores, slag inclusions and unfused welds. The undercut depth shall not exceed 0.5mm. The misalignment of the joints shall be 0.1 wall thickness. ·178.
HGJ528-—90
8.2.6 The welding requirements of pipe fittings shall comply with the provisions of GB15089 "Steel Pressure Vessels". 8.3 Heat treatment
8.3.1 The formed parts shall be heat treated according to the requirements of Table 7. Table 7 Heat treatment
Material grade
12GrMo
15CrMo
12Cr1Mov
OCr19Nig
1Cr18Ni9
1Cr18Ni9Ti
·It is the solution treatment temperature.
Heat treatment requirements
Cold forming
Normalizing or tempering
Hot forming
Normalizing + tempering
Solution treatment
650~700°C tempering
900~930°C normalizing
650~700C tempering
900~930C normalizing, 670~720*C tempering
930~960°C normalizing, 680~720°C tempering980~1020*C normalizing, 720~760°C tempering1010~1150°C fast cooling
.1010~1150°C fast cooling||t t||*920~1150°cQuick cooling
8.3.2The hardness of the pipe fittings after heat treatment shall be tested, and the value is: 20
HB≤156
HB≤180
84Surface treatment
12CrMo
15CrMo
12CriMov
HB=156
HB=170
OCr19Nig
1Cr18Ni9
1Cr18Ni9Ti
8.4.1The inner and outer surfaces of carbon steel and alloy steel pipe fittings shall be derusted and painted with negative rust paint. 8.4.2Austenitic stainless steel pipe fittings shall be pickled and passivated. 9 Finished product test
HB≤187
HB≤187
HB≤187
9.1 All pipe fittings manufactured and inspected according to this technical condition may not be subjected to single-piece water pressure test, but it shall be ensured that all pipe fittings can pass the assessment of water pressure test in the system. 9.2 For the first batch of manufactured pipe fittings (or when required by the user), liquid burst test shall be conducted on finished product samples. The actual bursting pressure shall not be less than the calculated value of P of the straight pipe section welded with it: P=2as
Wherein, P--the calculated bursting pressure of the straight pipe section, MPa; -the minimum tensile strength of the straight pipe section material, MPa: ·179-
S-the wall thickness of the straight pipe section, mm;
D-the outer diameter of the straight pipe section, mm
10.1 Surface quality
HGJ528-90
10 Acceptance
The finished pipe fittings shall not have cracks, overburning and other defects that damage the strength and appearance (such as scars, etc.). The inner and outer surfaces shall be smooth and free of oxide scale.
10.2 Overall dimensions
The overall dimensions of the pipe fittings shall comply with the provisions of Chapter 6 of this standard, and the shape and size of the groove shall comply with the provisions of Chapter 7 of this standard.
10.3 Welds
All welds shall be 100% inspected by radiographic or ultrasonic testing. Radiographic testing shall be carried out in accordance with the provisions of GB3323 "Radiographic Photography and Quality Grading of Steel Fusion Welded Butt Joints", and Grade I is qualified. Ultrasonic testing shall be carried out in accordance with the provisions of JB1152 "Ultrasonic Testing of Butt Welds of Boilers and Steel Pressure Vessels", and Grade I is qualified: 10.4 Sampling
The ordering unit has the right to spot check products according to the technical requirements of this regulation. If unqualified products are found during the spot check, the manufacturing unit shall bear the inspection costs and be responsible for returning the products for repair or compensation in accordance with relevant regulations. If the spot-checked products are qualified, the inspection costs shall be borne by the ordering unit.
Marking and Printing
11.1 Finished pipe fittings must be sprayed or printed with a mark in a prominent position. The marking content is as follows: Nominal diameter:
Wall thickness grade:
Material brand:
Manufacturer code or trademark.
【Example 1】: The tee (or reducer) with a nominal diameter of 400×250mm, an outer diameter of I series, a wall thickness grade of Sch.40, and a material of 15CrMc is marked as 400x250I-Sch.40-15CrMo
Manufacturer code or trademark
【Example 2】: The 90° long and short radius elbows with a nominal diameter of 200mm, an outer diameter of I series, a wall thickness grade of Sch.80, and a material of 16Mn are marked as follows: The long radius elbow is marked as: 2001-Sch80-16Mn-90LManufacturer code or trademark
The short radius elbow is marked as: 200I-Sch.80-16Mn-90SManufacturer code or trademark
·180-1 Finished pipe fittings must be sprayed or printed with marks in prominent positions. The marking content is as follows: Nominal diameter:
Wall thickness grade:
Material brand:
Manufacturer code or trademark.
【Example 1】: The tee (or reducer) with a nominal diameter of 400×250mm, an outer diameter of I series, a wall thickness grade of Sch.40, and a material of 15CrMc is marked as 400x250I-Sch.40-15CrMo
Manufacturer code or trademark
【Example 2】: The 90° long and short radius elbows with a nominal diameter of 200mm, an outer diameter of I series, a wall thickness grade of Sch.80, and a material of 16Mn are marked as follows: The long radius elbow is marked as: 2001-Sch80-16Mn-90LManufacturer code or trademark
The short radius elbow is marked as: 200I-Sch.80-16Mn-90SManufacturer code or trademark
·180-1 Finished pipe fittings must be sprayed or printed with marks in prominent positions. The marking content is as follows: Nominal diameter:
Wall thickness grade:
Material brand:
Manufacturer code or trademark.
【Example 1】: The tee (or reducer) with a nominal diameter of 400×250mm, an outer diameter of I series, a wall thickness grade of Sch.40, and a material of 15CrMc is marked as 400x250I-Sch.40-15CrMo
Manufacturer code or trademark
【Example 2】: The 90° long and short radius elbows with a nominal diameter of 200mm, an outer diameter of I series, a wall thickness grade of Sch.80, and a material of 16Mn are marked as follows: The long radius elbow is marked as: 2001-Sch80-16Mn-90LManufacturer code or trademark
The short radius elbow is marked as: 200I-Sch.80-16Mn-90SManufacturer code or trademark
·180-
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