This standard specifies the technical conditions for steel pipe flanges (European system). This standard applies to steel pipe flanges (including flange covers) specified in HG 20592. HG 20603-1997 Technical conditions for steel pipe flanges (European system) HG20603-1997 Standard download decompression password: www.bzxz.net

Technical conditions for steel pipe flanges
(European system)
HG20603--97
Subject content and scope of application
This standard specifies the technical conditions for steel pipe flanges (European system). This standard applies to steel pipe flanges (including flange covers) specified in HG20592. 137
《Steel Pressure Vessels》
Cited Standards
GB152.1~152.4《Through Holes and Countersunk Holes for Fasteners》GB700
GB3274Www.bzxZ.net
GB3531
GB4237
GB6654
GB12229
GB12230
GB/T14976
GB/T16253
JB4726
JB4727
JB472 8
JB4730
HG20537
HG20592
HG20604
ASTMA216
ASTMA351
ASTMA352
《Carbon Structural Steel》
《High-quality Carbon Structural Steel Hot-rolled Thick Plates and Strips》《Carbon Structural Steel and Low-alloy Structural Steel Hot-rolled Thick Plates and Strips》《Low-alloy Steel Plates for Low-temperature Pressure Vessels》《Stainless Steel Hot-rolled Plates》
《Steel Plates for Pressure Vessels》
《General "Technical Conditions for Carbon Steel Castings for Valves", "Technical Conditions for Austenitic Steel Castings for General Valves", "Seamless Stainless Steel Pipes for Fluid Transportation", "Pressure-Bearing Steel Castings", "Carbon Steel and Low Alloy Steel Forgings for Pressure Vessels", "Carbon Steel and Low Alloy Steel Forgings for Low-Temperature Pressure Vessels", "Stainless Steel Forgings for Pressure Vessels", "Non-destructive Testing of Pressure Vessels", "Austenitic Stainless Steel Welded Pipes", "Types and Parameters of Steel Pipe Flanges (European System)", "Pressure-Temperature Grades of Steel Pipe Flanges (European System)", "Technical Conditions for Carbon Steel Castings for High-Temperature Fusion Welding ... Technical conditions for austenitic steel castings" Technical conditions for ferritic steel castings for low temperature pressure parts" 3 Materials
The materials for steel pipe flanges shall be in accordance with the provisions of Table 3.0.1. Their chemical composition, mechanical properties and other technical requirements shall comply with the provisions of the relevant standards listed in Table 3.0.1.
CINU60
Industry common
The nominal pressure PN and operating temperature range of flange materials shall be in accordance with the provisions of Table 3.0.2. Table 3.0.2 Nominal pressure and operating temperature categories of pipe flange materials
1Cr-0.5Mo
21/4Cr -1Mo
5Cr-0.5Mo
Steel grade (standard grade)
Q235A(GB3274)
Q235B(GB3274)
20(GB711)
20R(GB6654)
20(JB4726)
09Mn2VDJB4727)
09MnNiD(JB4727)
16MnR(GB6654)
16MnDR(GB3531)|| tt | 0(GB4237.JB4728)
0Cr18Ni9(GB4237JB4728)
OCr18Ni10Ti(GB4237 .JB4728)
(1Cr18Ni9Ti)
00Cr17Ni14Mo2(GB4237JB4728）OCr17Ni12Mo2(GB4237.JB4728)
Nominal pressure PN, MPa
Working temperature, ℃
0~+350
0～+350
0~+350
-20~～475
-20~+475
-50~+350
-7 0~+350
20~+475
-40~~+350
—20~+475
-40~+350
20~550
>-20~+575
>-20+600
-196~+425
-196~+700
-196~+425
196~+700
Note: ① The nominal pressure and operating temperature of the integral flange made of casting material shall comply with the provisions of the relevant standards. If the relevant product standards do not specify, the nominal pressure and operating temperature range can also be determined according to the forging material corresponding to the casting according to Table 3.0.1. ② The nominal pressure and working temperature of the austenitic stainless steel butt welding ring of the steel pipe material shall comply with the provisions of the relevant steel pipe use standards. 141
3.0.3 The grade and technical requirements of forgings (including forged and rolled products) shall temporarily comply with the corresponding requirements of JB4726~4728. 1 Carbon steel and austenitic stainless steel forgings with a nominal pressure PN of 0.25MPa~1.OMPa are allowed to use Grade I forgings.
2 Except for the following provisions, forgings with a nominal pressure PN of 1.6MPa~6.3MPa shall comply with the requirements of Grade I or above forgings.
3 Those who meet any of the following conditions shall comply with the requirements of heavy-grade forgings: (1) Forgings for flanges with a nominal pressure PN10.OMPa; (2) Chromium-molybdenum steel forgings with a nominal pressure PN>4.OMPa; (3) Ferritic steel forgings with a nominal pressure PN>1.6MPa and a working temperature ≤-20℃. 3.0.4 Neck butt welding, neck flat welding, socket welding and threaded flanges are generally made of forging or forging process. When steel plates or steel sections are used for manufacturing, the following requirements must be met: 1 The steel plate should be ultrasonically inspected and free of delamination defects; 2 It should be cut into strips along the rolling direction of the steel, and be bent and welded into a ring, and the surface of the steel should form a cylindrical surface of the ring. Steel plates shall not be directly machined into neck flanges: 3 The butt weld of the ring should be a full penetration weld; 4 The butt weld of the ring should be post-weld heat treated and 100% radiographic or ultrasonically inspected, and the radiographic inspection shall meet the requirements of Level II of IB4730, and the ultrasonic inspection shall meet the requirements of Level I of JB4730. 3.0.5 The outer slope of the neck of the neck flat welding flange, socket welding flange and threaded flange shall not be greater than 7°. 142
4 Dimensional tolerance
4.0.1 The dimensional tolerance of the flange shall be in accordance with the provisions of Table 4.0.1. 4.0.2 The surface roughness of the flange sealing surface shall be selected according to the gasket type in accordance with the provisions of Table 4.0.2-1, and shall be indicated when ordering. When the surface roughness requirement of the sealing surface is not indicated when ordering, it shall be in accordance with the provisions of Table 4.0.2-2. 4.0.3 The dimension tolerance of the sealing surface of the ring connection surface shall be in accordance with the provisions of Table 4.0.3. The minimum hardness value of the ring groove shall be 30HB higher than the maximum hardness value of the metal ring gasket used.
4.0.4 The groove size of the flange (including flat welding ring and butt welding ring) shall be in accordance with the provisions of HG20605. Table 4.0.1 Dimensional tolerances of flanges
Flange thickness C
Flange height H
Flange neck large end
Diameter N
Butt welding flange or butt welding
Outer diameter A of ring welding end
Flange type
All types of flanges processed on both sides
(including strontium holes)
Neck flange
Butt welding ring
Neck butt welding flange
Integral flange
Neck flat welding flange
Socket welding flange
Threaded flange
Neck butt welding flange
Butt welding ring
Size range
18
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