Standard No.:	GJB 3326A-2019
English Name:	Specification for ultra-high strength steel rods for aerospace solid rocket motors
Chinese Name:	航天固体火箭发动机用超高强度钢棒规范
Professional Classification:	GJB    Professional Standard - Military
Issued on:	2019-12-08
Implemented on:	2020-1-1
Status:	valid
Target Language:	English
File Format:	PDF
Word Count:	4000 words
Translation Price(USD):	150.0
Delivery:	via email in 1 business day

GJB 3326A-2019 Specification for ultra-high strength steel bars of aerospace solid rocket motor 1 Scope This standard specifies the requirements for ultra-high strength steel bars of aerospace solid rocket motors. This standard is applicable to 30Si2MnCrMoVE, 33Si2MnCrMoVREE and 30Cr3SiNiMoVA hot-rolled forged round steel and flat steel (hereinafter referred to as "steel bars") with nominal diameters or side lengths not exceeding 450mm. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to 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 223.11 Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method GB/T 223.13 Methods for chemical analysis of iron, steel and alloy－The ammonium ferrous sulfate titration method for the determination of vanadium content GB/T 223.19 Methods for chemical analysis of iron steel and alloy - The neocuproine-chloroform extraction photometric method for the determination of copper 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 - The thiocyanate spectrophotometric method GB/T 223.33 Methods for chemical analysis of iron, steel and alloy - The chlorophosphonago mA photometric method for the determination of cerium content after extraction separation GB/T 223.58 Methods for chemical analysis of iron, steel and alloy - The sodium arsenite-sodium nitrite titrimetric method for the determination of manganese 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 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 231.1 Metallic materials - Brinell hardness test - Part 1: Test method GB/T 702 Hot-rolled steel bars - Dimensions, shape, weight and tolerances GB/T 908 Forged bars - Dimensions, shape, weight and tolerances GB/T 1979 Standard diagrams for macrostructure and defect of structural steels GB/T 2101 General requirement of acceptance, packaging, marking and certification for section steel GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing GB/T 4161-2007 Metallic materials - Determination of plane-strain fracture toughness GB/T 4162-2008 Forged and rolled steel bars - Method for ultrasonic testing GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method) GB/T 6394 Determination of estimating the average grain size of metal GB/T 10561-2005 Steel - Determination of content of nonmetallic inclusions - Micrographic method using standards diagrams GB/T 13298 Inspection methods of microstructure for metals GB/T 13299 Steel - Determination of microstructure 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) GJB 9443 Test method for macroetch testing of remelted steel bars and billets 3 Requirements 3.1 Smelting method 3.1.1 30Si2MnCrMoVE shall be smelted by a combined process of vacuum induction + vacuum arc remelting. 3.1.2 33Si2MnCrMoVREE shall be smelted by a process of electric arc furnace + electroslag remelting.

Contents Foreword i 1 Scope 2 Normative references 3 Requirements 4 Quality assurance requirements 5 Preparation for delivery 6 Matters to be noted