Detail of GB/T 3093-2021

Introduction of GB/T 3093-2021

High-pressure seamless steel tubes for diesel engine 1 Scope This standard specifies the classification and code, order content, dimension, shape, weight and permissible deviation, technical requirements, test method, inspection rules, packaging, marking and quality certificate of high-pressure seamless steel tubes for diesel engines. This standard is applicable to the manufacture of cold-drawn (rolled) seamless steel tubes for high-pressure fuel tubes of diesel engine injection system (hereinafter referred to as "steel tubes"). 2 Normative references The following documents, in whole or in part, are normatively referenced in this standard and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any 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 aluminum content — Chrome azurol S photometric method GB/T 223.12 Methods for chemical analysis of iron, steel and alloy — The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content 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 223.23 Iron, steel and alloy — Determination of nickel content — The dimethylglyoxime spectrophotometric method GB/T 223.26 Iron, steel and alloy — Determination of molybdenum content — Thiocyanate spectrophotometric method GB/T 223.40 Iron, steel and alloy — Determination of niobium content by the sulphochlorophenol S spectrophotometric method GB/T 223.53 Methods for chemical analysis of iron, steel and alloy — Flame atomic absorption spectrometric method for the determination of copper content 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 223.84 Steel, iron 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 228.1 Metallic materials — Tensile testing — Part 1: Method of test at room temperature GB/T 241 Metal materials — Tube — Hydrostatic pressure test GB/T 244 Metallic material — Tube — Bend test GB/T 2102 Acceptance, packing, marking and quality certification of steel pipe GB/T 2975 Steel and steel products — Location and preparation of samples and test pieces for mechanical testing GB/T 4335 Carbon and low-alloy steel — Determination of multi-element contents — Spark discharge atomic emission spectrometric method (routine method) GB/T 4340.1 Metallic materials — Vickers hardness test — Part 1: Test method 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 — Micrographic method using standards diagrams GB/T 17395 Dimensions, shapes, masses and tolerances of seamless steel tubes 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 20124 Steel and iron — Determination of nitrogen content — Thermal conductimetric method after fusion in a current of inert gas (routine method) GB/T 20125 Low-alloy steel — Determination of multi-element contents — Inductively coupled plasma atomic emission spectrometric method GB/T 30062 Terminology of steel pipes and tubes YB/T 5293 Metallic materials — Forging test 3 Terms and definitions For the purposes of this standard, the terms and definitions given in GB/T 30062 apply. 4 Classification and code 4.1 Steel tubes are classified upon their application as follows: a) Class A: for diesel engines and maintenance piping generally required; b) Class B: for diesel engines high-precision required; c) Class C: for diesel engine jet pump test bench or other special requirements. 4.2 Steel tubes are classified and coded upon dimensional precision as follows: a) Common precision, with a code of PA;

Contents of GB/T 3093-2021

Foreword iii 1 Scope 2 Normative references 3 Terms and definitions 4 Classification and code 5 Order content 6 Dimension, shape, weight and permissible deviation 7 Technical requirements 8 Test method 9 Inspection rules 10 Packing, marking and quality certification