Water-tube boilers - Part 2: Materials
1 Scope
This document specifies the selection principles and requirements of materials for pressure and non-pressure elements and stressed members of water-tube boilers, the application scope (temperature and pressure) and allowable stress of materials, and the general requirements for boiler steel structure and welding materials.
This document is applicable to the material selection and use requirements for pressure and non-pressure elements, stressed members, steel structures and welding materials of water-tube boilers defined in GB/T 16507.1.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute indispensable provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 150.2 Pressure Vessels - Part 2: Materials
GB/T 699 Quality carbon structure steels
GB/T 700 Carbon structural steels
GB/T 711 Hot-rolled quality carbon structural steel plates sheets and strips
GB/T 713 Steel plates for boilers and pressure vessels
GB/T 983 Stainless steel covered electrodes
GB/T 984 Hardfacing electrodes for shielded metal arc welding
GB/T 1220 Stainless steel bars
GB/T 1221 Heat-resistant steel bars
GB/T 1348 Spheroidal graphite iron castings
GB/T 1591 High strength low alloy structural steels
GB/T 2900.48 Electrotechnical terminology of boilers
GB/T 3077 Alloy structural steels
GB/T 3087 Seamless steel tubes for low and medium pressure boiler
GB/T 3091 Welded steel pipes for low pressure liquid delivery
GB/T 3274 Hot-rolled plates, sheets and strips of carbon structural steels and high strength low alloy structural steels
GB/T 3280 Cold rolled stainless steel plate, sheet and strip
GB/T 4237 Hot rolled stainless steel plate, sheet and strip
GB/T 5117 Covered electrodes for manual metal arc welding of non-alloy and fine grain steels
GB/T 5118 Covered electrodes for manual metal arc welding of creep-resisting steels
GB/T 5293 Solid wire electrodes, tubular cored electrodes and electrode/flux combinations for submerged arc welding of non alloy and fine grain steels
GB/T 5310 Seamless steel tubes and pipes for high pressure boiler
GB/T 5313 Steel plates with through-thickness characteristics
GB/T 6394 Determination of estimating the average grain size of metal
GB/T 6803 Test method for drop-weight test to determine nil-ductility transition temperature of ferritic steels
GB/T 8110 Wire electrodes and weld deposits for gas shielded metal arc welding of non alloy and fine grain steels
GB/T 8163 Seamless steel pipes for liquid service
GB/T 9439 Grey iron castings
GB/T 9440 Malleable iron castings
GB/T 9711 Petroleum and natural gas industries - Steel pipe for pipeline transportation systems
GB/T 10045 Tubular cored electrodes for non-alloy and fine grain steels
GB/T 10561 Steel - Determination of content of nonmetallic inclusions - Micrographic method using standards diagrams
GB/T 12470 Solid wire electrodes ,tubular cored electrodes and electrode/ flux combinations for submerged arc welding of creep-resisting steels
GB/T 13298 Inspection methods of microstructure for metals
GB/T 14957 Steel wires for melt welding
GB/T 16507.1 Water-tube boilers - Part 1: General requirement
GB/T 17493 Tubular cored electrodes for creep-resisting steels
GB/T 17854 Solid wire electrodes/flux combinations for submerged arc welding of stainless steels
GB/T 29713 Wire electrodes, strip electrodes, wires and rods for arc welding of stainless and heat resisting steels
GB/T 32533 Covered electrodes for manual metal arc welding of high-strength steels
DL/T 439 The technical guide for high-temperature bolt of fossil-fired power plant
JB/T 3223 Welding material quality management specifications
JB/T 3375 Rules for receiving acceptance of materials for boiler construction
JB/T 9625 Specification for pressure retaining casting of boiler pipe fittings
NB/T 47008 Carbon and alloy steel forgings for pressure equipment
NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipment
NB/T 47013.3 Nondestructive testing of pressure equipments - Part 3: Ultrasonic testing
NB/T 47018 (All parts) Technical permission of welding materials for pressure equipment
NB/T 47019.3 Purchase technical specification for boiler & heater exchanger tubes/pipes - Part 3: Non-alloy and alloy steel with specified elevated temperature properties
YB/T 5092 Stainless steel wires for welding
3 Terms and definitions
For the purpose of this document, the terms and definitions given in GB/T 2900.48 and GB/T 16507.1 apply.
4 Basic requirements
4.1 The steel used for pressure elements and load-bearing members welded therewith shall be killed steel.
4.2 Elements not specified in the material standard shall not be added to the material without the consent of the boiler fabrication unit.
4.3 The boiler fabrication unit shall accept the boiler materials according to the items specified in JB/T 3375, and use them only after they are qualified.
4.4 Materials that meet one of the following conditions may not undergo physical and chemical re-inspection and corresponding nondestructive re-testing upon acceptance:
a) the acceptance personnel shall conduct acceptance in the material fabrication unit according to the procurement technical requirements, and sign the inspection report or relevant quality certification documents for confirmation;
b) for carbon steel and carbon manganese steel materials for boilers with the rated working pressure less than 3.8MPa, the physical identification shall be clear and complete, and there shall be quality certificates that meet the requirements of 4.6 and are consistent with the materials.
Foreword i
Introduction v
1 Scope
2 Normative references
3 Terms and definitions
4 Basic requirements
5 Design and material selection
6 Materials for pressure elements
7 Materials for stressed members
8 Materials for steel structure
9 Welding materials
Annex A (Normative) Supplementary requirements for materials
Annex B (Informative) Elasticity modulus, thermal conductivity and expansion coefficient of common materials
Annex C (Normative) Metallographic inspection for steel forgings
Bibliography
