Standard No.:	GB/T 18984-2026
English Name:	Seamless steel tubes and pipes for low temperature service
Chinese Name:	低温管道用无缝钢管
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR, SAC
Issued on:	2026-04-30
Implemented on:	2026-11-1
Status:	to be valid
Superseding:	GB/T 18984-2016 Seamless steel tubes for low-temperature-service piping
Target Language:	English
File Format:	PDF
Word Count:	9000 words
Translation Price(USD):	270.0
Delivery:	via email in 1~3 business day

GB/T 18984-2026 Seamless steel tubes and pipes for low temperature service English, Anglais, Englisch, Inglés, えいご This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered. ICS CCS National Standard of the People's Republic of China ‌GB/T 18984-2026 Seamless steel tubes and pipes for low temperature service 低温管道用无缝钢管 Issue date: 2026-04-30 Implementation date: 2026-10-01 Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China the Standardization Administration of the People's Republic of China Contents Foreword 1 Scope 2 Normative References 3 Terms and Definitions 4 Classification and Designation 5 Ordering Information 6 Manufacturing Process 7 Technical Requirements 8 Test Pieces 9 Test Methods 10 Inspection Rules 11 Packaging, Marking and Quality Certificate Seamless steel pipes for lowtemperature service pipelines 1 Scope This document specifies the classification and designation, ordering information, manufacturing process, technical requirements, test pieces, test methods, inspection rules, packaging, marking and quality certificate for seamless steel pipes for lowtemperature service pipelines. This document applies to seamless steel pipes (hereinafter referred to as “pipes”) for lowtemperature fluid transmission pipelines and lowtemperature heat exchangers at temperature levels from –45 °C to –196 °C. 2 Normative References The following documents are essential for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies. GB/T 222 Steel and alloy — Permissible tolerances for chemical composition of finished products GB/T 223.5 Steel and iron — Determination of acidsoluble silicon and total silicon content — Reduced molybdosilicate spectrophotometric method GB/T 223.8 Iron, steel and alloy — Determination of aluminium content — Titration and spectrophotometric method GB/T 223.11 Iron, steel and alloy — Determination of chromium content — Titration and spectrophotometric method GB/T 223.13 Iron, steel and alloy — Determination of vanadium content — Titration and spectrophotometric method GB/T 223.19 Methods for chemical analysis of iron, steel and alloy — Determination of copper content — Neocuproinechloroform extraction photometric method GB/T 223.23 Iron, steel and alloy — Determination of nickel content — Dimethylglyoxime spectrophotometric method GB/T 223.25 Methods for chemical analysis of iron, steel and alloy — Determination of nickel content — Dimethylglyoxime gravimetric method GB/T 223.26 Iron, steel and alloy — Determination of molybdenum content — Thiocyanate spectrophotometric method GB/T 223.29 Iron, steel and alloy — Determination of lead content — Carrier precipitationxylenol orange spectrophotometric method GB/T 223.31 Iron, steel and alloy — Determination of arsenic content — Spectrophotometric method and iodometric method GB/T 223.40 Iron, steel and alloy — Determination of niobium content — Chlorosulfophenol S spectrophotometric method GB/T 223.47 Methods for chemical analysis of iron, steel and alloy — Determination of antimony content — Carrier precipitationmolybdenum blue photometric method GB/T 223.50 Methods for chemical analysis of iron, steel and alloy — Determination of tin content — Phenylfluoronecetyltrimethylammonium bromide direct photometric 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 Iron, steel and alloy — Determination of manganese content — Sodium (potassium) periodate spectrophotometric method GB/T 223.80 Iron, steel and alloy — Determination of bismuth and arsenic content — Hydride generationatomic fluorescence spectrometric method GB/T 223.84 Iron, steel and alloy — Determination of titanium content — Diantipyrylmethane spectrophotometric method GB/T 223.85 Steel and iron — Determination of sulfur content — Infrared absorption method after combustion in an induction furnace GB/T 223.86 Steel and iron — Determination of total carbon content — Infrared absorption method after combustion in an induction furnace GB/T 226 Etching test method for macrostructure and defects of steel 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 232 Metallic materials — Bend test method GB/T 241 Metallic materials — Tube — Hydrostatic pressure test method GB/T 242 Metallic materials — Tube — Flaring test method GB/T 246 Metallic materials — Tube — Flattening test method GB/T 1979 Evaluation method for macrostructure defects of structural steel — Acid etch test and ultrasonic test GB/T 2102 Acceptance, packing, marking and quality certificate of steel pipes GB/T 2975 Steel and steel products — Location and preparation of test pieces for mechanical testing GB/T 4336 Carbon and lowalloy steel — Determination of multielement contents — Spark discharge atomic emission spectrometric method (routine method) GB/T 5777 Full peripheral automatic ultrasonic testing of longitudinal and/or transverse imperfections in seamless and welded (except submerged arc welded) steel tubes GB/T 7735 Automatic eddy current testing of imperfections in seamless and welded (except submerged arc welded) steel tubes GB/T 10561-2023 Steel — Determination of content of nonmetallic inclusions — Micrographic method using standard diagrams GB/T 12606 Full peripheral automatic magnetic flux leakage testing of longitudinal and/or transverse imperfections in ferromagnetic seamless and welded (except submerged arc welded) steel tubes GB/T 17395 Dimensions, shape, weight and tolerances of steel pipes GB/T 20066 Steel and iron — Sampling and preparation of samples for the determination of chemical composition GB/T 20123 Steel and iron — Determination of total carbon and sulfur content — Infrared absorption method after combustion in an induction furnace (routine method) GB/T 20125 Lowalloy steel — Determination of multielement contents — Inductively coupled plasma atomic emission spectrometric method GB/T 30062 Terminology of steel pipes GB/T 32548 Steel and iron — Determination of tin, antimony, cerium, lead and bismuth — Inductively coupled plasma mass spectrometric method YB/T 4149 Continuous cast round billet for seamless steel tube YB/T 5137 Round billet for continuously rolled and forged seamless steel pipe for high pressure service 3 Terms and Definitions The terms and definitions given in GB/T 30062 apply to this document. 4 Classification and Designation 4.1 The seamless steel pipes in this document are classified into two types according to the product manufacturing process, with their categories and designations as follows: a) Hotrolled (extruded, expanded) steel pipes, designated WH; b) Colddrawn (rolled) steel pipes, designated WC. 4.2 The letters “DG” after the steel grade designation in this document are the initials of the Chinese Pinyin for “low temperature” and “pipeline”. 5 Ordering Information A contract or order for pipes according to this document shall include, but not be limited to, the following: a) Product name; b) Number of this document; c) Steel grade or unified digital designation; d) Ordered quantity (total mass or total length); e) Dimensions and specification (nominal outside diameter × nominal wall thickness, in millimetres); f) Delivery condition; g) Manufacturing method; h) Special requirements. 6 Manufacturing Process 6.1 Steelmaking process The steel shall be melted by an electric arc furnace plus secondary refining and vacuum refining treatment, or by an oxygen converter plus secondary refining and vacuum refining treatment. Other steelmaking processes with higher requirements may be used subject to agreement between the supplier and the purchaser and specified in the contract. 6.2 Manufacturing method of tube billet The tube billet may be manufactured by continuous casting, ingot casting or hotrolling (forging).