HG 20584-1998 Technical requirements for the manufacture of steel chemical vessels
Some standard content:
Industry Standard of the People's Republic of China
HG20584—1998
Technical Requirements for Fabrication of Steel Chemical Vessels1998-11--18 Issued
State Administration of Petroleum and Chemical Industry
1999-03-01
Industry Standard of the People's Republic of China
Technical Requirements for Fabrication of Steel Chemical Vessels VesselsHG20584-1998
Editor: National Chemical Equipment Design Technology Center Approval Department: State Petroleum and Chemical Industry Bureau Implementation Date: March 1, 1999 National Chemical Engineering Construction Standard Editing Center (formerly the Engineering Construction Standard Editing Center of the Ministry of Chemical Industry) 1999 Beijing
This standard (HG20584-1998) is based on the original standard (HGJ18-89), based on the experience gained from many years of implementation, and based on the content of national standard GB150-1998 and the standard specifications of domestic and foreign engineering companies in recent years. The new revised standard has the following major changes compared with the original standard: 1. According to the provisions of JB4730, the non-destructive testing of steel for pressure components is revised; 2. The treatment provisions for delamination defects at the groove are added; 3. The heat treatment provisions for cold-processed shells and heads are modified. Appendices A and B of this standard are the appendices of this standard. This standard is proposed and managed by the National Chemical Equipment Design Technology Center. This standard is edited by the National Chemical Equipment Design Technology Center. The main drafter of this standard: Ying Daoyan
HG20584 "Technical Requirements for Manufacturing of Steel Chemical Containers" is a supplement and concretization of GB150 "Steel Pressure Vessels" in combination with the specific conditions of chemical container design.
The scope of use, referenced standards and definitions of this standard are the same as those of GB150 "Steel Pressure Vessels" (hereinafter referred to as GB150), unless otherwise specified.
1.0.1 This standard applies to the manufacture, inspection, packaging and transportation of pressure vessels made of carbon steel, low alloy steel and austenitic stainless steel. 1.0.2 In addition to meeting the requirements of this standard, the requirements for the manufacture and inspection of containers shall also meet the requirements of GB150 and drawings. 1.0.3 In addition to meeting the requirements of this standard, various lined and composite plate containers shall also meet the corresponding special technical requirements, such as JB/ZQ267 "Technical Conditions for Chromium-Nickel Austenitic Stainless Steel Plug Welding Lining Equipment" and CD130A3 "Technical Conditions for Stainless Composite Steel Plate Welded Pressure Vessels".
1.0.4 Ferritic steel cryogenic pressure vessels with a design temperature equal to or lower than -20°C shall also comply with the requirements of HG20585 "Technical Regulations for Steel Cryogenic Pressure Vessels".
1.0.5 If the manufacturing and construction units need to modify the design requirements, they shall obtain the written consent of the design unit. 383
HG20581
HG20582
HG20585
JB/ZQ267
CD130A3
ZBG93004
GB8923
"Steel Pressure Vessels"
Referenced Standards
"Regulations on Material Selection for Steel Chemical Vessels", "Regulations on Structural Design for Steel Chemical Vessels", "Technical Regulations for Steel Cryogenic Pressure Vessels" Nondestructive Testing Standards Listed in Table 3-1||tt ||Fastener standards listed in Appendix B
"Technical conditions for chrome-nickel austenitic stainless steel plug welding lining equipment" "Technical conditions for stainless steel composite steel plate welded pressure vessels" "Ultrasonic inspection of automatic cladding layer of stainless steel strip electrode" "Surface rust level and rust removal level of steel before painting" 3 Raw materials for manufacturing
3.0.1 Raw materials for pressure vessel pressure components shall meet the following requirements: 1 Design document requirements;
2GB150;
3HG20581;
4 Corresponding requirements of this standard.
3.0.2 The manufacturer shall inspect and accept the materials sent to the factory according to the provisions of 3.0.1, and re-inspect them if necessary. If the performance data required by 3.0.1 for the materials is incomplete, the manufacturer shall re-inspect or make up, and the materials can be put into use only after they are qualified. 3.0.3 If the steel manufacturer fails to perform non-destructive testing according to the requirements of 3.0.1, the manufacturer shall make up. Unless otherwise specified in the design documents, the non-destructive testing method and grade assessment of steel for pressure components shall be carried out in accordance with the provisions of Table 3-1. If there is no special requirement for the design, the qualified grade shall be in accordance with the requirements of Tables 3-2~35.
3.0.4 The surface quality of steel plates for pressure components shall meet the following requirements. The surface quality of steel plates after the container is manufactured shall also meet this requirement.
Scratches, rolling marks, pits, roughness after oxide scale falls off, etc. with a depth not exceeding half of the negative deviation of the thickness are allowed on the surface of the steel plate.
2Defects with a depth exceeding that specified in the above paragraph, as well as any tensile cracks, bubbles, cracks, scars, folds, pressed oxide scales, inclusions, welding marks, arc pits, splashes, etc., shall be polished and removed. The area to be cleared and ground should not exceed 30% of the area of the steel plate. The ground pit should have a smooth transition with the parent material, and the slope should not exceed 1.3.3 After grinding, if the remaining thickness is not less than the design thickness, and the pit depth is less than 5% of the nominal thickness or 2mm (the smaller one), no repair welding is allowed. If the pit depth is deeper, but the remaining thickness still meets the above requirements, it should be negotiated with the designer. 4 Defects beyond the above limits should be considered for repair welding. However, the allowable repair area and depth shall meet the following requirements: 1) Carbon steel, 16Mn and other C-Mn steels: single repair area is less than or equal to 200cm2, total area is less than or equal to 600cm2 or 3% (whichever is smaller);
(2) Low alloy high strength steel and low alloy chromium molybdenum steel: single repair area is less than or equal to 100cm2, total area is less than or equal to 300cm2 or 2% (whichever is smaller);
(3) The allowable depth of welding repair shall not exceed 1/5 of the plate thickness. 5 If the length of the delamination at the edge of the steel plate is not more than 25mm, it can be exempted from repair or removal: Delaminations with a length greater than 25mm and a depth greater than 1.5mm should be ground away. If the grinding depth is not more than 3mm, it can be exempted from welding repair, otherwise it should be used after welding repair. Delaminations with a spacing of no more than 5% of the plate thickness in the same plane should be regarded as continuous delamination lengths. 6 The repair welding of delaminations on the surface and groove of the steel plate should meet the requirements of 5.6 and 5.3.3. 3.0.5 The dimensions and surface quality of pressure forgings shall meet the following requirements: 1 The inner diameter of the forged body, measured on any important section, shall not exceed 1% of the designed inner diameter of the section for the maximum and minimum diameters at 90° to each other.
2 If the thickness of the forging is less than the designed thickness in some local areas, but the surrounding area has sufficient thickness and meets the requirements for reinforcement (opening) in accordance with GB150, the forging is allowed to be used without repair welding. 3 The surface of the forging (except the machined surface of the forging) is allowed to have surface irregular defects such as heavy skin, scars, cutting marks, etc. with a depth not exceeding 5% of the nominal thickness or 1.5mm (whichever is smaller) and an ear length not exceeding 20mm, but cracks and other sharp cut-shaped 385
defects shall be removed regardless of depth and length. 4 Surface defects that do not meet the requirements of the above paragraph shall be polished and removed, and the transition to the parent material shall be smooth, with an inclination of no more than 1:3. 5 The remaining thickness after the defects are removed shall not be less than the designed thickness. If the remaining thickness is insufficient, the method in the second paragraph of Article 3.0.5 shall be used for reinforcement calculation and meet the requirements, otherwise it shall be welded. Table 3-1
Material Type
Steel Plate for Pressure Vessel
Composite Steel Plate
Seamless Steel Pipe
Stainless Steel Seamless Pipe
Forged Steel Bar
(For Fasteners)
Forgings for Pressure Vessel
Austenitic Steel Forgings
Carbon Steel and Low Alloy Steel
Austenitic Steel Castings
Material Type
Carbon Steel,
Low Alloy Steel Plate for Pressure Vessel
Composite Steel Plate
Seamless Steel Pipe||tt| |Austenitic stainless steel
Seamless steel pipe
GB5677
Radiographic photography of steel castings and
Film grade classification method
Non-destructive testing method and grade assessment of steel for pressure components Ultrasonic
JB47308.1
JB47308.3
JB47308.4
JB47308.4
JB47308.5
JB47308.2
JB47308.6
JB/ZQ6109
Ultrasonic testing method for steel castings
JB473011.3
JB473011.3
GB9444
Magnetic particle testing and quality rating method for steel castings
Table 3-2 Ultrasonic flaw detection qualification level of steel (steel plate, steel pipe) Ultrasonic
Standard Standard: JB47308.1
Scope of application: 6~250mm (thickness)
Qualified level: general carbon steel, low alloy steel plate ear level penetration
JB473012.7
GB9443
Rating method for penetration testing of steel castings and defect display marks
P≥10.0MPa single-layer commercial pressure vessel, multi-layer high-pressure vessel inner simple steel plate, quenched and tempered Steel plate level 1 standard: JB47308.3
Scope of application: rolled and explosively pressed composite steel plates with a total thickness greater than 8mmQualified level: Composite plate for tube sheet level I
Hot-pressed head and high-pressure vessel composite steel plate level 1General composite plate level I
Standard: JB47308.4
Scope of application: Carbon steel and low alloy steel with an outer diameter of 12~480mm and a wall thickness greater than or equal to 2mm without relaysQualified level, level I (P< 10.0MPa）
Grade I (P≥10.0MPa) (Properties)
Standard: JB47308.4
Applicable scope: Qualified grade of austenitic seamless pipe with outer diameter of 12~160mm and wall thickness of 2~10mm; Grade I (P<10.0MPa)
Grade I (P≥10.0MPa)
Note: The surface magnetic particle inspection of high-pressure seamless steel pipe shall comply with JB473011.13 Grade I. 386
Material Type
Forged Steel
(For Studs)
Material Type
Table 3-3 Grades for Nondestructive Testing of Steel (Steel Bars for Fasteners) Ultrasonic
Standard: JB47308.5
Scope of Application: Forged Steel Bars (Bad) with a diameter greater than M50, longitudinal wave detection, detection surface Ra6.3
Qualified Grade: P≥10.0MPa Enclosure Grade
Table 3-4
Ultrasonic
Standard: JB47308.2
Carbon Steel and|| for Pressure Vessels tt||Low alloy steel
Austenitic
Steel forgings
Material variety
Carbon steel and
Low alloy steel
Austenitic steel
Standard: JB473011.13
Scope of application: P≥10.0MPaHigh pressure stud linear less than or equal to 1.5mm
Circular less than or equal to $4mm
Forging non-destructive testing qualified level
Standard: JB473011.13
Requirement: Generally carried out after heat treatment and roughening, detection surface Ra6.3. Longitudinal wave detection, simple forgings also undergo shear wave detection
Qualified level: According to the provisions of JB4726~4727 Standard: JB47308.6
Requirements are the same as above
Qualified level: According to the provisions of JB4728
Requirements: Forgings after processing
Ra6.3 or above
Qualified level:
Linearity is less than or equal to 2mm
Circularity is less than or equal to $4mm
Table 3-5 Qualified level of non-destructive testing of castings
Standard: GB5677
Requirements: Casting surface is clean||tt ||Net, determine the critical section according to the casting
process and
conditions of use
Qualified level: Level 3
Ultrasonic
Standard: JB/ZQ6109
Requirements: Heat treatment before flaw detection,
Surface roughness
Ra12.5 or above
Qualified level: Level 3
Standard: GB9444
Requirements: In delivery state, surface
roughness Ra25
Qualified level:
Same
Requirements for penetrant flaw detection. Point, point-line and line defects are not greater than level 3, cracks are not allowed. Standard: JB473012.7 Requirement: Silver parts are processed and then tested. Sandblasting and shot peening are not allowed on the inspected surface. Qualified level: Linear less than or equal to 2mm Round less than or equal to 4mm Standard: GB9443 Requirements: Delivery status, surface roughness Ra50 or above. Qualified level: The following defects are not allowed: a. Any cracks and hot cracks. b. A rectangular frame of 105mmX148mm is used as the evaluation frame. c. Point, point-line, and line defects are not greater than level 3, and cracks are not allowed. 6 The repair welding of forgings must be approved by the designer. If the depth of repair welding exceeds 1/3 of the nominal wall thickness or 10mm, or the repair welding area is greater than 10% of the total area of the forging, the forging is not allowed to be repaired and should be scrapped. 3.0.6 Surface quality requirements for pressure-bearing components 1 The surface quality (appearance) of steel castings shall meet the requirements specified in the drawings. 2 The surface of steel castings is allowed to have defects (except cracks) with a depth not exceeding 20% of the nominal wall thickness, and the thickness of the defect-free part is not less than the wall thickness required for strength design. The length of the allowable defect shall comply with the requirements of Table 3-6. 387
Defect category
Sand hole, sand inclusion
Table 3-6 Allowable length of surface defects of steel castings Defect length (mm)
Nominal wall thickness (mm)
>10～25
>25~≤50
>50~≤80
3 All cracks, shrinkage holes perpendicular to the wall thickness direction and defects exceeding the requirements of the above paragraph shall be polished and removed, and the polished pits shall have a smooth transition with the base material, with an inclination of no more than 1:3. 4 When the remaining thickness after removing the defects exceeds 80% of the nominal wall thickness and exceeds the thickness required for strength design, it is not necessary to repair welding, otherwise it shall be repaired by welding.
3.0.7 All temporary accessories directly welded to the surface of high alloy steel shall use the same steel and welding materials as the main body. 3.0.8 The substitution of materials for pressure components and the use of steel produced according to foreign standards shall comply with the corresponding requirements of Chapter 10 and Chapter 9 of HG20581, and obtain the written consent of the design unit. 388
Processing and Forming
4.0.1 The markings of pressure component materials shall be retained during the processing. If necessary, the markings shall be transferred to the workpiece, and the transferred markings shall be correct, accurate, clear and durable. 4.0.2 Hot stamping or cold stamping shall use dies, and local heating and hammering shall not be used. 4.0.3 After cold processing and cold forming of steel plates for pressure components, if the deformation rate exceeds the range of the following paragraph 1 and meets any of the following paragraphs 2 to 7, heat treatment shall be carried out to eliminate processing stress and improve ductility. 1 Carbon steel, 16MnR: 3% (uniaxial stretching), 5% (biaxial stretching): other low alloy steel: 2.5% (uniaxial stretching), 5% (biaxial stretching); austenitic stainless steel: 15%
The processing deformation rate of steel plate is calculated as follows: Uniaxial stretching (such as steel plate curling)
E=(8/2R)X(1-R/R)X100%
Biaxial stretching (such as simplified folding, cold pressing head) E=(1.5/2R)X(1—R/R)X100%
Where:
-steel plate deformation rate, %;
-steel plate nominal thickness, mm
Central radius of steel plate after bending, mm;
R. The central radius of the steel plate before bending, for flat plate R. is infinite, mm. 2 The medium used is extremely hazardous or highly hazardous; 3 When the medium has stress corrosion cracking hazards to the material; The thickness reduction after forming is greater than 10% (carbon steel, low alloy steel); 4
The material requires higher impact toughness or low temperature impact toughness (carbon steel, low alloy steel); 5
The surface hardness HB after forming is greater than 235 (austenitic stainless steel); 6
The nominal thickness of the plate is greater than 16mm (carbon steel, low alloy steel). 4.0.4 After cold bending, if the deformation rate exceeds the following range, heat treatment should be carried out. 1 The outer fiber deformation rate of carbon steel and low alloy steel steel pipes after bending should not be greater than half of the elongation 8 specified in the steel pipe standard, or the residual elongation of the outer material should be not less than 10%. 2 For steel pipes with impact toughness requirements, the maximum deformation rate should not be greater than 5%. 4.0.5 Steels used in hot-rolled state can generally be used in processed state after hot working. Steels used in normalized state can be exempted from subsequent normalizing treatment if the hot working termination temperature can be controlled above the normalizing overflow of steel or the hot working process test plate is qualified. Steels used in normalized + tempered state can only be tempered after hot working if the above requirements for normalized steel can be met during hot working. Steels used in quenched and tempered state should generally be quenched and tempered after hot working. Austenitic stainless steel should control the final temperature of hot working above 850C, and should be cooled quickly after processing (such as blast or water spray cooling). If the material needs to be tested for intergranular corrosion tendency, it should be re-evaluated after hot working; if it does not meet the requirements of intergranular corrosion test after hot working, it should be subjected to solid solution or stabilization treatment.
4.0.6 The hot working of austenitic stainless steel should meet the following requirements: 1 Before heating, the surface oil and other attachments should be thoroughly removed; 2 During the heating process, it should not be in direct contact with flames or solid fuels, and the heating temperature should be uniform; 3 The furnace atmosphere should be controlled to be neutral or slightly oxidizing, and attention should be paid to the corrosion effect of sulfur content in the furnace atmosphere on stainless steel. 4.0.7 During the processing of stainless steel equipment, surface scratches should be prevented, and iron pollution caused by processing equipment should be paid attention. Tools such as grinding wheels that have been used for carbon steel parts should not be used for stainless steel equipment. 4.0.8 At least one 10 or M10 exhaust and signal hole should be opened on the pad and reinforcement plate on the shell. The reinforcement plate and the shell should fit tightly, with a maximum gap of 3mm. The welds covered by the reinforcement plate should be ground flat. 4.0.9 When internal parts with small gaps are installed inside the container, the inward extension length of the relevant pipe or other protrusions at any position should be controlled within the roundness tolerance of the container, or as specified in the drawing. The welds on the inner side of the relevant cylinder should be ground flat. For the covering gasket used for concave and convex or sample flanges, the overlapping side of the covering should be placed on the concave or groove side. 4.0.10
When the dished head is spliced by the top round plate and the petals, the top round plate should not be larger than 0.8DN (DN is the outer diameter of the head). 5
Welding and cutting
5.1 Cutting
5.1.1When cutting by flame cutting, slag and harmful impurities should be removed, and the groove should be processed flat with a grinding wheel or other tools. When the cutting material is high-strength steel or chromium-molybdenum alloy steel with a tensile strength of >540MPa as specified in the standard, the flame-cut surface should be polished or machined to remove the heat-affected zone and hardened zone, and magnetic particle or penetrant flaw detection should be performed. The carbon arc gouging surface of stainless steel should be polished with a grinding wheel to remove the carburized layer. 5.1.2 Whether or not to preheat during flame cutting should generally comply with the preheating requirements for steel welding. 5.1.3 If the opening edge of the pressure-bearing component or the end of the sheared material is not welded (such as the opening edge of the placement pipe or the end of the inner extension pipe), more than 3mm should be removed by grinding or other methods. 5.2 Weld positionbzxZ.net
5.2.1 The openings on the shell should be arranged as little as possible in the weld and its adjacent areas, but if one of the following conditions is met, it is allowed to open holes in the above areas:
1 Openings that meet the opening reinforcement requirements of GB150 can be opened in the weld area. 2 For openings that are allowed to be made without additional reinforcement in accordance with GB150, holes can be made in the circumferential weld area. However, in this case, the center of the opening should be taken as the center of the circle, and the welds included in the circle with a diameter of 3 times the length of the opening diameter should be subjected to 100% radiographic or ultrasonic flaw detection, and meet the requirements. Welds that can be removed due to openings may not be affected by the quality of flaw detection. 3 For openings that are allowed to be made without additional reinforcement in accordance with GB150, when the shell plate thickness is less than or equal to 40mm, the edge of the opening should be greater than or equal to 13mm from the edge of the main weld. However, if the main weld is subjected to radiographic or ultrasonic flaw detection in accordance with Article 5.2.1, paragraph 1, and meets the requirements, this restriction may not apply.
5.2.2 If the connecting weld between the external attachment and the shell intersects with the main weld of the shell, a notch should be opened on the attachment so that the connecting weld crosses the main weld. The width of the notch should be sufficient to ensure that the distance between the connecting weld and the edge of the main weld is more than 1.5 times the shell wall thickness. 5.3 Welding preparation
5.3.1 The surface of the base material within 15mm on both sides of the welding groove and at least on both sides shall be free of rust, oil, scale and other impurities. The cast surface of the steel casting shall be removed to reveal the metallic luster. 5.3.2 The surface quality of the gas-cut groove shall at least meet the requirements of Table 5-1. 3911 The surface of the base material within 15mm on both sides of the welding groove and at least on both sides shall be free of rust, oil, scale and other impurities. The cast surface of the steel casting shall be removed to reveal the metallic luster. 5.3.2 The surface quality of the gas-cut groove shall at least meet the requirements of Table 5-1. 3911 The surface of the base material within 15mm on both sides of the welding groove and at least on both sides shall be free of rust, oil, scale and other impurities. The cast surface of the steel casting shall be removed to reveal the metallic luster. 5.3.2 The surface quality of the gas-cut groove shall at least meet the requirements of Table 5-1. 391
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