Seamless steel gas cylinders - Part 3: Normalized cylinders
1 Scope
This part of GB/T 5099 specifies the type and parameters, technical requirements, test methods, inspection rules, marking, coating, packaging, transportation, storage, product certificate, and quality certificate for batch inspection of normalized or normalized and tempered steel seamless gas cylinders (hereinafter referred to as steel cylinders).
This part is applicable to the design and manufacture of refillable steel cylinders with nominal working pressure not greater than 15 MPa, nominal water capacity of 0.5 L ~ 150 L and the environment temperature for use of -20℃~60℃, used to contain compressed gas or high-pressure liquefied gas.
This part is not applicable to vehicle gas cylinders and cylinder-type pressure vessels attached to machinery and equipment.
Note: the seamless steel gas cylinders with the nominal water capacity less than 0.5 L can also be manufactured and inspected with reference to this part.
2 Normative references
The following referenced documents are indispensable for the application 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 196 General purpose metric screw threads - Basic dimensions (ISO 724)
GB/T 197 General purpose metric screw threads - Tolerances (ISO 965-1)
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223 (all parts) Methods for chemical analysis of iron, steel and alloy
GB/T 224 Determination of depth of decarburization of steels (ISO 3887)
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO 6892)
GB/T 229 Metallic materials - Charpy pendulum impact test (ISO 148-1)
GB/T 232 Metallic materials - Bend test (ISO 7438)
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 5777-2008 Seamless steel pipe and tubing methods for ultrasonic testing (ISO 9303:1989)
GB/T 6394 Determination of estimating the average grain size of metal
GB/T 7144 Coloured cylinder mark for gases
GB/T 8335 Special threads for gas cylinders
GB/T 836 Special thread gauges for gas cylinders
GB/T 9251 Methods for hydrostatic test of gas cylinders
GB/T 9252 Method for pressure cycling test of gas cylinders
GB/T 12137 Methods for leakage test of gas cylinders
GB/T 13005 Terminology of gas cylinders
GB/T 13298 Inspection methods of microstructure for metals
GB/T 13299 Steel - Determination of microstructure
GB/T 13447 Steel blank for seamless gas cylinder
GB/T 15384 Designation for gas cylinders
GB/T 15385 Method for hydraulic burst test of gas cylinder
GB/T 18248 Seamless steel tubes for gas cylinder
JB/T 6065 Non-destructive testing - Shims for magnetic particle testing
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this standard, the terms and definitions specified in GB/T 13005 as well as the followings apply
3.1.1
yield stress
stress value of the upper yield point in case of obvious yield; of the specified non-proportional extension of 0.2% in case of no obvious yield during tensile test of materials
3.1.2
normalizing
heat treatment in which a cylinder is heated to a uniform temperature above the upper critical point, Ac3, of the steel and then cooled in still air
3.1.3
tempering
toughening heat treatment which follows normalizing, in which the cylinder is heated to a uniform temperature below the lower critical point, Ac1, of the steel
3.1.4
batch
quantity of steel cylinders with the same design, the same furnace number, the same manufacturing method and the same heat treatment specification for continuous heat treatment
3.2 Symbols
For the purposes of this document, the following symbols apply.
GB/T 5099.3-2017 The following standards are cited：
