GB/T 3624 - 2010 Titanium pipe GB: 5 core points

GB/T 3624 - 2010 Titanium and titanium alloy seamless tubestitanium pipeCore national standards for procurement and arrival acceptance, Standardized industrial pure titanium, Titanium alloy seamless pipe, chemical component, Mechanical properties and inspection rules.This article combines Baoji China titanium valley industry practical experience, combtitanium pipe5 core points that procurement must master to help equipment procurement and technical personnel understand standards and controltitanium pipeQuality of procurement.

Point 1: Scope of application GB/T 3624 - 2010 is suitable for titanium and titanium alloy seamless tubes produced by cold rolling or cold drawing process. Specification coverage: outer diameter range 3-150mm, wall thickness 0.5-10mm, pipe length up to 9000mm, length support customized. At the same time, it is clear that the pipe types that this standard does not apply: titanium welded pipe shall comply with GB/T 26057;Titanium steel clad pipes refer to GB/T 12459;Titanium thick wall tubes with wall thickness greater than 10mm shall comply with GB/T 3625 standard.

Point 2: Brand and supply status The standard covers a number of titanium grades, including industrial pure titanium TA1, TA2, TA3;corrosion resistant titanium alloy TA9 and TA10;Structure Titanium alloy TC4. The main supply status of products is divided into two kinds: annealed state (M), which is the most commonly used state for procurement, with excellent plasticity of materials;Cold working state (Y), higher material strength, suitable for high strength requirements of the working conditions.

Point 3: Specifications and allowable deviations Pipe specifications are divided into three categories according to outer diameter, Small diameter pipe diameter Φ3-25mm, More for instrumentation, heat exchangerMedium diameter pipe diameter Φ25-80mm, belonging to the mainstream specifications in the field of chemical engineering and marine engineering;Large diameter pipe diameter Φ80-150mm, mostly used for thick wall structure scene. Key index of size deviation: deviation of ordinary grade of outer diameter ±0.13-0.65mm, graded according to the size of outer diameter;The deviation of wall thickness shall be ±12.5%, and the maximum deviation shall not exceed ±1.5mm;The deviation of length to length is + 10/-0mm. Purchasing Tips, gauge pipe, Medical tubes such as high-precision products, High precision class size requirements need to be agreed with the supplier in advance.

Point 4: Chemical composition Seamless with TA2titanium pipeFor example, the national standard stipulates that titanium is used as the matrix balance, and the content is ≥99.6%;Fe ≤0.30%;Carbon ≤0.10%;Nitrogen ≤0.05%;Hydrogen ≤0.015%;Oxygen ≤0.25%. TC4 pipe chemical composition reference: titanium for the matrix balance;aluminum content 5.5 - 6.8 percent;Vanadium content 3.5 -4.5%.Iron ≤0.30%;Oxygen ≤0.20%.

Point 5: Mechanical properties and inspection requirements Mechanical properties of annealed TA2 tubes, Tensile strength ≥400MPa, Yield strength ≥275MPa, Elongation ≥25%, simultaneous flare test, Flattening test shall be qualified, The plasticity and formability of materials were verified respectively. The standard stipulates 5 compulsory inspection items: chemical composition analysis according to furnace number;Mechanical property test, including tensile strength, yield strength and elongation;flaring and flattening test;Hydrostatic test or pneumatic test, used to verify the tightness of pipes;size measurement and surface quality inspection. Procurement acceptance points: heat exchanger and other important conditions usedtitanium pipeIt is recommended to do hydraulic test;Additional ultrasonic or eddy current testing can be added for demanding scenarios;For each batch of products, the supplier shall provide the material warranty and the third party test report simultaneously.

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