1. Introduction to Seamless Titanium and Titanium Alloy Tubes GB/T3624-2010
1.1 Grade, Delivery Condition and Specifications of Titanium and Titanium Alloy Tubes
Grade: TA1, TA2, TA10, etc.
Delivery Condition: Annealed (M)
Outer Diameter: 3 - 110mm
Wall Thickness: 0.2 - 5.5mm
1.2 Chemical Composition
The chemical composition of the product complies with the provisions of GB/T3620.1. The allowable deviation of the chemical composition complies with the provisions of GB/T3620.2.
1.3 Inspection and Acceptance
Chemical composition analysis, tensile test, flattening test, hydrostatic test, pneumatic test, bending test, and appearance quality inspection.
Chemical composition analysis is conducted in accordance with GB/T4698.
Tensile test is conducted in accordance with GB/T228.
Flattening test is conducted in accordance with GB/T246.
Hydrostatic test is conducted in accordance with GB/T241.
Pneumatic test is conducted in accordance with the mutually agreed method by both the supplier and the buyer.
Bending test is conducted in accordance with GB/T244.
Appearance inspection is conducted by visual inspection for defects such as damage and scratches.
II. Introduction to Titanium and Titanium Alloy Heat Exchanger Tubes and Condenser Tubes GB/T3625-2007
1. The titanium tubes specified in GB/T3625-2007 are suitable for manufacturing heat exchangers, condensers and various pressure vessels.
2. Grades, Delivery Conditions and Specifications of Titanium and Titanium Alloy Tubes
Grades: TA1, TA2, TA10
Delivery Condition (M): Outer Diameter: 10 - 80mm
Wall Thickness: 0.2 - 4.5mm
3. Inspection and Acceptance
Chemical composition analysis, tensile test, flattening test, hydrostatic test, pneumatic test, bending test, non-destructive testing (ultrasonic flaw detection), flaring test, and appearance quality inspection.
Chemical composition analysis shall be conducted in accordance with GB/T4698.
The tensile test is conducted in accordance with GB/T228.
The flattening test is conducted in accordance with GB/T246.
The hydraulic test shall be carried out in accordance with GB/T 241.
The air pressure test shall be conducted in the manner agreed upon by both the supplier and the buyer.
The bending test is conducted in accordance with GB/T244.
Non-destructive testing methods: For pipe materials within the size range specified in GB/T12969, ultrasonic and eddy current testing shall be conducted in accordance with GB/T12969. For those exceeding the size range specified in GB/T12969, manual ultrasonic flaw detection is permitted.
The flaring test is conducted in accordance with GB/T 242.
Visual inspection is carried out to check for damages, scratches, etc.
III. Comparison between GB/T3624 and GB/T3625
From the detailed comparison of the above two standards, it can be seen that the main difference between titanium tubes for heat exchangers, condensers and pressure vessels and ordinary titanium tubes lies in the fact that the latter includes two important items, namely flaring test and non-destructive testing, in the inspection methods. This puts forward higher requirements for the plasticity index of the material and the scale of microscopic defects.