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GB/T 18984-2016 English PDF (GBT18984-2016)

GB/T 18984-2016 English PDF (GBT18984-2016)

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GB/T 18984-2016: Seamless steel tubes for low-temperature-service piping

This Standard specifies the category, code, order content, dimension, shape, mass, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of seamless steel tubes for low-temperature-service piping.
GB/T 18984-2016
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.75
H 48
Replacing GB/T 18984-2003
Seamless steel tubes for
low-temperature-service piping
ISSUED ON. DECEMBER 30, 2016
IMPLEMENTED ON. SEPTEMBER 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Category and code ... 7
4 Order content ... 7
5 Dimension, shape and mass ... 8
6 Technical requirements ... 10
7 Inspection and test methods ... 15
8 Inspection rules ... 16
9 Packaging, marking and quality certificates ... 17
Annex A (normative) Specification for sampling of steel tubes?€? tensile test ... 18 Foreword
This Standard is drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 18984-2003 ?€?Seamless steel tubes for low-temperature- service piping?€?, compared with GB/T 18984-2003, the main technical changes are as follows.
- MODIFY the normative references;
- MODIFY the scope of steel tubes?€? ordering specifications;
- MODIFY the allowable deviation of steel tubes?€? dimension;
- MODIFY the allowable deviation of cut to length;
- MODIFY the curvature specifications;
- ADD the steel grade of 06Ni9DG;
- MODIFY the requirements for phosphorus and sulfur content of steel;
- MODIFY the smelting method of steel;
- MODIFY the delivery state of steel tubes;
- MODIFY the scope of applicable specifications and determination requirements of flattening test;
- MODIFY the requirements for low magnification inspection;
- MODIFY the requirements for nonmetallic inclusion testing;
- MODIFY the requirements for nondestructive testing;
- MODIFY the batching rules.
This Standard is proposed by the China Iron and Steel Association.
This Standard is under the jurisdiction of National Technical Committee on Steel of Standardization Administration of China (SAC/TC 183).
Drafting organizations of this Standard. Chengdu Steel Vanadium Co., Ltd. of Panzhihua Iron and Steel Group, Hengyang Valin Steel Tube Co., Ltd., China Metallurgical Information and Standardization Institute.
Main drafters of this Standard. Cheng Haitao, Wu Hong, Huang Pingjia, Zhao Bin, Seamless steel tubes for
low-temperature-service piping
1 Scope
This Standard specifies the category, code, order content, dimension, shape, mass, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of seamless steel tubes for low-temperature-service piping. This Standard applies to seamless steel tubes for -45 ??C grade to -196 ??C grade low- temperature pressure vessel piping and low-temperature heat exchanger piping. 2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the dated edition cited applies. For undated references, the latest edition of the referenced document (including all amendments) applies.
GB/T 222 Permissible tolerances for chemical composition of steel products GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method
GB/T 223.9 Iron steel and alloy - Determination of aluminium content - Chrom azurol S photometric method
GB/T 223.14 Methods for chemical analysis of iron, steel and alloy - The N-benzoy- N-phenylhydroxylamine extraction photometric method for the determination of vanadium content
GB/T 223.16 Methods for chemical analysis of iron, steel and alloy - The chromotropic acid photometric method for the determination of titanium content GB/T 223.25 Methods for chemical analysis of iron, steel and alloy - The dimethylglyoxime gravimetric method for the determination of nickel content GB/T 223.26 Iron steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method
GB/T 223.40 Iron steel and alloy - Determination of niobium content by the sulphochlorophenol S spectrophotometric method
GB/T 223.59 Iron steel and alloy - Determination of phosphorus content - Bismuth phosphomolybdate blue spectrophotometric method and antimony
phosphomolybdate blue spectrophotometric method
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium (potassium) periodate photometric method for the determination of manganese content
GB/T 223.68 Methods for chemical analysis of iron, steel and alloy - The potassium iodate titration method after combustion in the pipe furnace for the determination of sulfur content
GB/T 223.69 Iron steel and alloy - Determination of carbon contents - Gas- volumetric method after combustion in the pipe furnace
GB/T 226 Test method for macrostructure and defect of steel by etching
GB/T 228.1 Metallic materials - Tensile testing - Part 1. Method of test at room temperature
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 241 Metallic materials - Tube - Hydrostatic pressure test
GB/T 242 Metallic materials - Tube - Drift-expending test
GB/T 244 Metallic materials - Tube - Bend test
GB/T 246 Metallic materials - Tube - Flattening test
GB/T 1979 Standard diagrams for macrostructure and defect of structural steels GB/T 2102 Acceptance packing marking and quality certification of steel pipe GB/T 2975 Steel and steel products - Location and preparation of test pieces for mechanical testing
GB/T 4336 Standard test method for spark discharge atomic emission
spectrometric analysis of carbon and low - Alloy steel (routine method) GB/T 5777-2008 Seamless steel pipe and tubing methods for ultrasonic testing GB/T 7735-2016 Automated eddy current testing of seamless and welded (except submerged arc-welded) steel tubes for detection of imperfections
GB/T 10561-2005 Steel - Determination of content of nonmetallic inclusions - The normal length of steel tubes is 4000 mm ~ 12000 mm.
Negotiated by supply and demand parties and specified in the contract, short-length steel tubes with a length shorter than 4000 mm but not shorter than 3000 mm can be delivered, but the quantity shall not exceed 5 % of the total quantity of the steel tube delivered.
5.2.2 Cut to length and multiple length
5.2.2.1 According to the requirements of the demand party, through the negotiation between supply and demand parties, and specified in the contract, steel tubes can be delivered in cut to length or multiple length. The total length of steel tubes?€? cut to length or multiple length shall be within the normal length.
5.2.2.2 Allowable deviation of cut to length of steel tubes shall comply with the following specifications.
a) length ??? 6000 mm, 0 mm ~ 10 mm;
b) length > 6000 mm, 0 mm ~ 15 mm.
5.2.2.3 Each multiple length shall be given an incision margin as follows. a) when D ??? 159 mm, the incision margin is 5 mm ~ 10 mm;
b) when D > 159 mm, the incision margin is 10 mm ~ 15 mm.
5.3 Curvature
The curvature of steel tubes shall be not more than the following.
a) when S ??? 15 mm, the curvature is not more than 1.5 mm/m;
b) when S > 15 mm ~ 30mm, the curvature is not more than 2.0 mm/m;
c) when S > 30 mm or D ??? 351 mm, the curvature is not more than 3.0 mm/m. 5.4 End shape
The end surface of two ends of steel tubes shall be perpendicular to the axis of steel tubes, and the burrs on the incision shall be removed.
5.5 Out-of-roundness and unevenness of wall thickness
According to the requirements of the demand party, through the negotiation between supply and demand parties, and specified in the contract, the out-of-roundness and unevenness of wall thickness of steel tubes shall not exceed 80 % of the outer diameter tolerance and wall thickness tolerance respectively.
replace hydrostatic pressure test. When the magnetic flux leakage testing is used, the longitudinal groove of the outer surface of the sample tube for comparison shall comply with the specifications of acceptance grade F4 in GB/T 12606-2016. When the eddy current testing is used, the artificial defect of the sample tube for comparison shall comply with the specifications of acceptance grade E4H or E4 in GB/T 7735-2016. 6.6 Process performance
6.6.1 Flattening
Steel tubes with a diameter greater than 22 mm shall be subjected to the flattening test. The distance between the plates after flattening the sample is calculated according to formula (2). When the sample is pressed to such that the distance between two plates is H, the fractures or cracks are not allowed on the sample. ?? ??? ???????????????/????????????/??? ... (2)
where.
H - the distance between plates, in millimeters (mm);
S - the nominal wall thickness of steel tubes, in millimeters (mm);
D - the nominal diameter of steel tubes, in millimeters (mm);
?? - the deformation coefficient of unit length, 0.08.
6.6.2 Bending
According to the requirements o...

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