GJB 2218A-2018 Specification for titanium and titanium alloy bars and forging stocks for aircraft
1 Scope
This specification specifies the requirements for titanium and titanium alloy bars and forging stocks.
This specification is applicable to hot-rolled and hot-forged titanium and titanium alloy bars and forging stocks (disks, rings).
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 228.1-2010 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 228.2 Metallic materials - Tensile testing - Part 2: Method of test at elevated temperature
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 2039-1997 Metallic materials - Creep and stress-rupture test in tension
GB/T 3620.1 Designation and composition of titanium and titanium alloys
GB/T 3620.2 Titanium and titanium alloy permissible variations of chemical composition for wrought product analysis
GB/T 4161 Metallic materials - Determination of plane-strain fracture toughness
GB/T 4698 (all parts) Methods for chemical analysis of titanium sponge, titanium and titanium alloys
GB/T 5168 Microstructure and macrostructure examination for α-β titanium alloys
GB/T 5193-2007 Method of ultrasonic inspection for wrought titanium and titanium alloy products
GB/T 8180 Wrought titanium and titanium alloy products packing, marking, transporting and storing
GB/T 9445 Non-destructive testing - Qualification and certification of NDT personnel
GB/T 23605 Determination of β transus temperature of titanium alloys
GJB 1580 Ultrasonic inspection of wrought metal
3 Requirements
3.1 Materials
3.1.1 Ingots used for manufacturing bars and forging stocks shall be smelted in vacuum consumable arc furnaces, with no less than two smelting times. Among them, the smelting times for TA15, TA19, TA32, TA33, TC4ELI, TC11, TC17, TC18, TC19, TC21, TC25 and TB6 shall be three. The pressure during the stable stage of the last melting shall not be less than 5Pa (excluding melting with inert gas filled).
3.1.2 Consumable electrodes shall not be welded through tungsten inert gas welding.
3.2 Grade, state and specification of products
The grades, states, and specifications of bars and forging stocks shall meet those specified in Table 1 and Table 2 respectively. Among them, TA15 and TC4ELI bars shall be classified into Class A and Class B based on their uses. If not specified in the contract, Class A shall be supplied. When requested by the purchaser and specified in the contract, Class B may be supplied.
3.3 Chemical composition
3.3.1 The chemical composition of bars and forging stocks shall meet those specified in Table 3, and other requirements shall be as specified in GB/T 3620.1.
3.3.2 When the purchaser samples from the bars and forging stocks for re-inspection of chemical composition, the tolerance of chemical composition shall meet those specified in GB/T 3620.2.
Table 1
Dimensions in millimeters
Grade Supply state Bar diameter Length
TA1, TA2, TA3, TA13, TC6, TC19, TC25, TB6 Hot-worked state (R) 12~250 500~5000
TA7, TA15 (Class A), TA19, TA33, TC1, TC2, TC11, TC17 12~300
TA32, TC4ELI (Classes A and B), TC21 12~350
TA15 (Class B), TC4, TC18 12~400
Contents
Foreword i
1 Scope
2 Normative references
3 Requirements
4 Requirements for quality assurance
5 Delivery preparation
6 Instructions
Annex A (Normative) Ultrasonic testing method for TA15 (Class B) titanium alloy bars
