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1、ICS 27.060.30 J98 Record number： NB Energy Sector Standard of the Peoples Republic China NB/T 470432014 Replace JB/T 16201993 Technical specification for manufacture of boiler steel structures 锅炉钢结构制造技术规范 （English translation） Issue date:2014-06-29 Implementation date:2014-11-01 Issued by National E
2、nergy Administration of the Peoples Republic of China NB/T 470432014 I Foreword SAC/TC 262 is in charge of this english translation. In case of any doubt the contents of English translation, the Chinese original shall be considered authoritative. This standard is drafted in accordance with the rules
3、 given in GB/T 1.12009 Directives for standardizationPart 1: Structure and drafting of standards. This standard replaces the JB/T 16201993 (Technical specifications for boiler steel structure) in whole. In addition to a number of editorial changes, the following deviations have been made with respec
4、t to the JB/T 16201993(Technical specifications for boiler steel structure) (the previous edition): The Chapter of Terms and Definitions is added, and the definitions of main terms are given to correctly explain the content of this Standard, and avoid comprehension deviation. The requirement that th
5、e main girder and steel plate with thickness of more than 60 mm need to be subject to 100% ultrasonic testing is added in the material chapter. The requirement to eliminate residual stress for steel blanking and flame cutting preheating is added. Provision for H-steel splicing is added. The specific
6、 requirements for welding operation environment, welding material management, welding preheating, post welding heat treatment, etc. are added. The content of drilling is added, and the high strength bolt hole diameter and hole deviation is regulated. Provision for friction type high strength bolt fr
7、iction surface is added. The requirements for allowable deviation of kinds of compound sections are added. Requirements for beam, column bending vector and beam camber are modified. NB/T 470432014 II The deviation requirements for high strength bolt jointing members and connections are added. Provis
8、ion for flame cutting deviation is added. Provision for fabrication deviation of horizontal split girder is added. Provision for fabrication deviation of column base is added. The quality grades and the relevant detection requirements of types of weld are added. Trial assembly content is added. This
9、 Standard was proposed and prepared by SAC/TC 262(China Standardization Committee on Boilers and Pressure Vessels). The previous editions of this standard are as follow: JB/T 1620-1993. NB/T 470432014 III Contents Foreword . I 1 Scope . 1 2 Normative References . 1 3 Terms and Definitions . 2 4 Gene
10、ral Requirements . 2 5 Materials . 3 6 Manufacture . 4 7 Welding . 8 8 Dimensional Deviation . 9 9 Inspection . 23 10 Repair . 26 11 Trial Assembly . 27 12 Rust Removal, Paint and Packaging . 28 13 Mark . 28 14 Quality Certificate . 28 NB/T 470432014 1 Technical specification for manufacture of boil
11、er steel structures 1 Scope This standard specifies the requirements of boiler steel structure fabrication and inspection. This standard is applicable to boiler steel structure columns, beams, vertical braces, horizontal braces, trusses, frameworks, platform stairs, column base plates, anchor bolt f
12、ixing frames, buckstays, etc. 2 Normative References The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) appli
13、es. GB/T 700 Carbon structural steels GB/T 1228 High strength bolts with large hexagon head for steel structures GB/T 1229 High strength large hexagon nuts for steel structures GB/T 1230 high strength plain washers for steel structures GB/T 1231 Specifications of high strength bolts with large hexag
14、on head, large hexagon nuts, plain washers for steel structures GB/T 1591 High strength low alloy structural steels GB/T 3632 Sets of torshear type high strength bolt hexagon nut and plain washer for steel structure GB/T 5117 Covered electrodes for manual metal arc welding of non-alloy and fine grai
15、n steels GB/T 5118 Covered electrodes for manual metal arc welding of creep-resisting steels GB/T 5293 Carbon steel wire and flux for submerged arc welding GB/T 5313 Steel plates with through-thickness characteristics GB/T 8110 Welding wires for gas shielding arc welding of carbon and low alloy stee
16、ls GB/T 10045 Carbon steel flux cored wire GB/T 12470 Low-alloy steel wire and flux for submerged arc welding GB/T 14957 Steel wires for melt welding GB/T 17493 Low alloy steel flux cored electrodes for arc welding GB/T 22395 Specification for design of boiler steel structures GB 50661 Code for weld
17、ing of steel structures JB/T 1615 Specifications for painting and packing of boiler JB/T 3223 Rules of quality management of welding materials JB/T 3375 Rules for receiving acceptance of materials for boiler construction JB/T 4730.3 Nondestructive testing of pressure equipment Part 3: ultrasonic tes
18、ting NB/T 470432014 2 JB/T 4730.4 Nondestructive testing of pressure equipment Part 4: magnetic particle testing JGJ 82 Technical specification for high strength bolt connections of steel structures YB/T 4001.1 Steel bar grating and matching parts Part 1:steel bar grating 3 Terms and Definitions 3.1
19、 main column It mainly bears the boiler proper load, wind load and seismic action, including the internal columns and external columns of boiler steel structure 3.2 main boiler support level It is the general name of the girders used to suspend or support the boiler proper load at the top of boiler
20、steel structure 3.3 main girder It is the girder in the main boiler support level directly transferring the boiler proper load to column 3.4 secondary girder It is connected with the main girder and transfers load to the main girder 3.5 horizontal split girder It is composed of upper part and lower
21、part, which are the girders connected by bolts or welds to operate together 3.6 buckstay It surrounds and is hung on the periphery of the wall of the boiler, and it is a steel structure system to protect the wall of the boiler 4 General Requirements 4.1 The boiler steel structure designed by GB/T 22
22、395 shall be manufactured and inspected according to this standard. 4.2 The manufacturer of boiler steel structure shall have the relevant qualification, and have the effective quality management system and quality control and inspection system. 4.3 The manufacture and acceptance of boiler steel str
23、ucture shall adopt the qualified measuring instruments which have been subject to metrological verification and calibration. 4.4 Welder (including tack welder) shall have the relevant operation qualification certificate, its welding scope shall not exceed the provision of the qualification certifica
24、te, and welding operation shall meet the requirements in the process documents. 4.5 Nondestructive testing operator and adjudicator shall get the relevant qualification certificate by assessment according to the relative regulations. NB/T 470432014 3 4.6 If the welding process of the composition con
25、ditions of parameters for steel, welding materials, structure form, requirement of post welding heat treatment(PWHT), welding specification parameters, preheating and post heat measures adopted by the manufacturer for the first time before manufacturing, shall be evaluated according to GB 50661. 4.7
26、 If quality problem appears during manufacture process of boiler steel structure, reasons shall be found out timely while repairing and correction, and measures shall be taken to prevent such accidents. 4.8 When bolt connected structure or complex structure is finished, it should be subject to trial
27、 assembly in the factory. 5 Materials 5.1 The materials for boiler steel structure shall meet the requirements in the design documents, and the welding material shall meet the requirements in the process documents. 5.2 The steel and welding materials for boiler steel structure shall have complete qu
28、ality certificate. Mechanical property and chemical composition of steel shall meet the requirements in GB/T 700, GB/T 1591 and GB 5313; electrodes shall meet the requirements in GB/T 5117 and GB/T 5118. Welding wires and flux for submerged arc welding shall meet the requirements in GB/T 5293 and GB
29、/T 12470. Welding wires for gas-shielded arc welding shall meet the requirements in GB/T 8110, GB/T 10045, GB/T 14957 and GB/T 17493. 5.3 The set of high strength bolt shall meet the requirements in GB/T 1228, GB/T 1229, GB/T 1230, GB/T 1231 and GB/T 3632 respectively. 5.4 Except for the requirement
30、s in this Standard, it shall meet the relevant standards when other materials are used. 5.5 For the material meeting one of the following conditions, the steel plate shall be subject to 100% ultrasonic testing, and the quality grade shall meet the requirements of Grade III in JB/T 4730.3: a) When th
31、e thickness of flange and web of main girder adopt the low-alloy high-strength structural steel not less than 32 mm, or carbon structural steel not less than 36 mm. b) When the thickness of steel plate is more than or equal to 60 mm. c) For the steel plate with thickness of less than 60 mm, when the
32、re is requirement for design. 5.6 Materials, meeting one of the following conditions, shall be subject to re-inspection according to JB/T 3375, and unqualified materials shall not be used: a) Welding materials. b) Steel plate thickness more than 50 mm incl., and having the Z direction performance re
33、quirement. c) Steel for manufacturing main girder (including connecting plates at both ends or connecting angle at both ends) and main column. d) Steel having quality doubts. e) When there are design requirements. 5.7 To avoid misuse of materials, materials shall be marked, and material marking tran
34、sfer shall meet the relative regulations. 5.8 Material substitution shall be approved according to the specific procedures. NB/T 470432014 4 6 Manufacture 6.1 Material preparation 6.1.1 Steel (steel plate and section steel) shall be corrected before material preparation. 6.1.2 The method of machinin
35、g, shear (punching), band saw, flame cutting and grinding may be used for material preparation, no layered, crack, slag inclusion and other defects shall be at the steel edge after material preparation, and clean the slag and burr to ensure the edge of material is flat. 6.1.3 When the thickness of s
36、teel plate is more than 20 mm, the heat treatment may be adopted to relieve the stress after shear (punching). 6.1.4 After the flame cutting is adopted by the steel plate at bottom flange of main girder, relevant measures may be adopted to relieve the residual stress. 6.1.5 When the thickness of ste
37、el plate is more than 40 mm, and the flame cutting is adopted, the preheating may be carried out by the process requirements. 6.2 Splice 6.2.1 Splice of steel plate and hot rolled section steel shall conform to the requirements in this standard. 6.2.2 As for the beam, column and other members that n
38、eed to be spliced, the manufacturer shall draw the splice drawing before splicing, and the splice drawing of main girder shall be countersigned by the design department. 6.2.3 Splice of hot rolled section steel may adopt the following two forms: a) Adopt the butt weld with full penetration. b) Adopt
39、 the reinforced plate structure. As for the splice of angle steel, channel steel, I steel and H steel, the part of steel covered by the reinforced plate adopts the V-shaped groove with welding by one side, other splice parts adopt the V-shaped groove with welding by both sides (back sealing weld), a
40、s shown in Figure 1. Groove size shall conform to the process requirements given by the manufacturer, the size of reinforced plate and the height K of surrounding corners shall comply with values in Table 13. Figure 1 Splice Drawing of Angle Steel, Channel Steel, I Steel and H Steel NB/T 470432014 5
41、 Table 1 Reinforced Plate Size of Angle Steel Model Reinforced plate size(A B) mm K mm Model Reinforced plate size(A B) mm K mm L75x50 x8 =6 ,30 x100 5 L160 x100 x12 =8,100 x100 60 x100 6 L75x75x8 =6, 40 x100 5 L100 x63x8 =6, 40 x100 5 L160 x100 x16 =8 ,100 x140 60 x140 6 L100 x63x10 =6 ,40 x100 5 L
42、100 x100 x10 =6 , 60 x100 5 L160 x160 x12 =8 ,100 x140 6 L125x80 x10 =6 ,60 x100 5 L160 x160 x16 =8 ,100 x140 6 L125x125x12 =8 ,80 x100 6 L200 x200 x20 =12,140 x200 10 Table 2 Reinforced Plate Size of I Steel and Channel Steel Model Reinforced plate size (A B)mm K mm Model Reinforced plate size (A B
43、) mm K mm I10 10 No reinforced plate (groove welding) I32 32 =8,220 x200 6 I12 12 No reinforced plate (groove welding) I36 36 =8,240 x200 6 I14 14 =6 ,100 x200 5 I40 40 =10,280 x200 8 I16 16 =6 ,120 x200 5 I45 =10,320 x200 8 I20 20 =6 ,140 x200 5 I50 =10,360 x200 8 I25 25 =8 ,160 x200 6 I56 =10,400
44、x200 8 I28 28 =8 ,180 x200 6 I60 =12,400 x200 8 I30 30 =8 ,200 x200 6 I63 =12,500 x200 8 Table 3 Reinforced Plate Size of H Steel Model (height width) Reinforced plate size (A B)mm K mm HW HM HN 150 x150 150 x100 150 x75 =6 ,90 x200 5 175x175 - 175x90 =6 ,100 x200 200 x200 200 x150 200 x100 =8 ,140
45、x200 6 250 x250 250 x175 250 x125 =8 ,160 x200 300 x300 300 x200 300 x150 =10 ,200 x200 8 350 x350 350 x250 350 x175 =10 ,240 x200 400 x400 400 x300 400 x200 =10 ,280 x200 - 450 x300 450 x200 =10 ,320 x200 - 500 x300 500 x200 =14 ,400 x200 12 - 600 x300 600 x200 =14 ,450 x200 - - 700 x300 =14 ,500 x200 NB/T 470432014 6 6.2.4 Hot rolled H-steel shall be in specified length for procurement, and it should not suitable for splicing for the manufacturer, when it has to be spliced, the weld through hole may be drille