GB/T 3621-2007 Titanium plate national standard: 6 core points

GB/T 3621-2007 "Titanium and Titanium Alloy Sheet" is a domesticTitanium PlateThe most authoritative national standard for procurement acceptance, Coated with commercially pure titanium, Titanium alloy a total of 10 commonly used brands, It is also carried out by buyersTitanium PlateThe core reference basis for arrival acceptance.Combined with Baoji China titanium valley special materials industry many years of practical experience, finishingTitanium PlateThe 6 core points that must be seen in material procurement, help industry, Marine Engineering, Equipment manufacturing industry procurement and technical personnel understand the national standard, standardTitanium PlateMaterial selection and acceptance work.

Point 1: Scope of application GB/T 3621-2007 is applicable to titanium and titanium alloy plates with thickness ranging from 0.3mm to 100mm. Cold rolled plates, hot rolled plates and composite plates are covered by this standard. This standard does not apply to the following categories, Titanium foil with thickness less than or equal to 0.3 mm, The implementation standard is GB/T 3622Titanium strip supplied in coils shall comply with GB/T 26723;Titanium steel composite plates need to comply with GB/T 8547 standards.

Key point 2: brand classification This standard contains a total of 10 titanium grades commonly used in the industry, which are divided into three categories.Industrial pure titanium contains TA1, TA2, TA3, TA4, the larger the number of brands, titanium purity gradually reduced;the corrosion resistant titanium alloy comprise TA8, TA8-1, TA9, TA9-1 and TA10;Structural titanium alloys include TA15, TA17, etc. The three most frequently used brands in procurement scenarios, TA1 is the highest purity, Titanium content ≥99.7%, More used in food, medicine, electronics fieldTA2 is the mainstream grade of industrial pure titanium, titanium content ≥99.6%, widely used in chemical industry, marine engineering;TA10 is a palladium containing corrosion resistant titanium alloy, Palladium content 0.12%-0.25%, Suitable for reducing medium corrosion conditions.

Point 3: Specification range thickness of wood plates, breadth, Length of coverage interval, Thickness 0.3-100mm, sheet, middle plate, Thick plate full coverageWidth 400-3000mm, according to the plate thickness classification control;Length 1000-6000mm, length support customized. Procurement practice tips: conventional stock specifications concentrated in thickness 1-30mm, width 1000-1500mm, length 2000-3000 mm.Non-standard plates with a width of more than 2000mm and a length of more than 6000mm need to be customized 15-20 days in advance.

Point 4: Chemical composition TA2 commonly used in the marketTitanium PlateFor example, the national standard specifies key element indicators: titanium as the matrix balance, content ≥99.6%;Fe ≤0.30%;Carbon ≤0.10%;Nitrogen ≤0.05%;Hydrogen ≤0.015%;Oxygen ≤0.25%. The key point is: oxygen content is righttitanium platePerformance has the greatest impact.The higher the oxygen content, the higher the strength of the material, but the plasticity decreases.TA2 national standard limits oxygen content ≤0.25%, which is the optimal index for both strength and plasticity.

Point 5: Mechanical properties Annealed state TA2 plate national standard mechanical performance indicators: tensile strength ≥400MPa, yield strength ≥275MPa, elongation ≥25%, bending angle ≥105°. Horizontal comparison of performance of different grades, TA1 slightly lower intensity, Tensile strength ≥370MPa, But plastic is better., Elongation ≥30%TA3 has higher strength, tensile strength ≥515MPa, relatively weak plasticity, elongation ≥20%;TA10 strength level is close to TA2, but corrosion resistance is more outstanding.

Point 6: Inspection rules The national standard specifies 5 mandatory inspection items: chemical composition analysis according to furnace number;mechanical property test, namely tensile strength, yield strength and elongation;size deviation detection, verification thickness, width, length;Surface quality inspection to check for surface defects such as cracks, peeling, and inclusions;For materials used in important working conditions, ultrasonic nondestructive testing should be added. Key points of practical operation of procurement acceptance, Request a complete material warranty from the supplier, The warranty shall be marked with furnace number, batch number, chemical component, mechanical propertyFor key equipment materials, third-party inspection reports such as SGS, CTI and Pony may be required;The arrival acceptance must use micrometers to measure the thickness of the plate at multiple points to avoid the material loss caused by negative thickness deviation.

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