This standard specifies the classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of industrial pure titanium, commonly used titanium alloys, and corrosion-resistant and high-strength titanium alloy castings. This standard applies to titanium and titanium alloy castings produced by graphite processing molds, graphite tamping molds, metal molds and investment casting molds. GB/T 6614-1994 Titanium and titanium alloy castings GB/T6614-1994 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Titanium and titanium alloy castings
Titanium and titanium alloy castingsSubject content and scope of application
GB/T 6614 - 94
Replaces GB661486
This standard specifies the classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of industrial pure titanium, commonly used titanium alloys, and corrosion-resistant and high-strength titanium alloy castings. This standard applies to titanium and titanium-containing gold castings produced by graphite processing, graphite tamping, metal and investment casting molds. Reference standards
GB 228
GB3623
GB4698
GB 5677
GB 6397
GB6414
Metal tensile test method
Metal Brinell hardness test method
Titanium and titanium alloy wire
Chemical analysis method of titanium and titanium alloy
Radiographic and film grade classification method of steel castingsMetal tensile test specimens
Dimensional tolerances of castings
GB/T8180Packaging, marking, transportation and storage of titanium and titanium alloy processed productsGB 9443
Rating method for penetrant testing and defect display traces of steel castings GB/T15073 Cast titanium and titanium alloy grades and chemical composition 3 Product classification
3.1 Grade, state
The grade and state of the product shall comply with the provisions of Table 1. Table 1
ZTi1, ZTi2.ZTi3,
ZTiAl4.ZTiAl5Sn2.5.7TiAl6Sn4. 5Nb2Mo1.5ZTiA16V4.ZTiM032
3.2 Marking example
Cast state (C),
Supply state
Stress relief annealing state (M),
Hot isostatic pressing state (HIP)
Pump body in stress relief annealing state cast with TiAI4 alloy: Pump body ZTiA14MGB/T6614-94. 4 Technical requirements
4.1 Materials
4.1.1 The master alloy ingot used for castings shall be melted by vacuum consumable electrode arc melting method, approved by the State Bureau of Technical Supervision on May 9, 1994 and implemented on December 1, 1994
CB/T 6614--- 94
4.1.2 When sponge titanium is used as the raw material, the alloy ingot shall be subjected to vacuum consumable electrode melting at least twice. 4.1.3 The returned material with the same alloy composition after treatment can be appropriately used as raw material. 4.2 Chemical composition
The chemical composition of the casting shall comply with the provisions of GB/T15073. 4.3 Mechanical properties
4.3.1 The room temperature mechanical properties of the casting in the as-cast state shall comply with the provisions of Table 2. The mechanical properties of other states shall be determined by negotiation between the supply and demand parties.
Tensile strength
ZTiAi4
ZTiA15Sn2.5
ZTiAI6VA
ZTiMo32
ZTiAl6Sn4.5Nb2Mo1.5
N/mm\, not less than
Specified residual elongation
Stress ro.2
N/mm\, not less than
Elongation
%, not less than
Not greater than
4.3.2 For products where the purchaser has special requirements for the content of impurity elements in the chemical composition, the mechanical properties should be negotiated by the supply and demand parties and indicated in the contract.
4.4 Geometric dimensionswww.bzxz.net
4.4.1 The geometric shape and dimensions of the casting should comply with the provisions of the casting drawing or order agreement. 4.4.2 Dimensional tolerance
The dimensional tolerance of castings shall comply with the provisions of GB/T6414 and shall generally not be lower than CT11 grade. If there are special requirements, the two parties shall negotiate and determine, and indicate it in the contract.
4.5 Surface quality
4.5.1 The burrs of castings shall be trimmed, the surface shall be smooth, and there shall be no sand sticking. 4.5.2 It is allowed to remove burrs and minor surface flow marks, cold shut and other defects of castings by grinding or other methods. Oxidation blueing is not allowed after grinding, and it shall be a smooth transition with the matrix. After grinding, the castings shall ensure that they meet the requirements of the casting drawing size. The parts that are not allowed to be polished shall be indicated in the drawings and contracts.
4.5.3 The castings shall not have cracks and penetrating holes, and the requirements for the sealing surface of the castings shall be indicated in the drawings and contracts. 4.5.4 If the purchaser has special requirements for the surface quality of the castings, it shall be determined by negotiation between the supply and demand parties. 4.5.5 When the purchaser requires and specifies in the contract, the casting surface may be non-destructively inspected in accordance with GB9443 or determined by negotiation between the two parties. 4.6 Internal quality
4.6.1 When the purchaser requires and specifies in the contract, the casting may be X-ray inspected. The inspection method and quality judgment standard shall refer to the requirements of (GB5677) or be determined by negotiation between the two parties.
4.7 Welding repair
4.7.1 Exposed pores, shrinkage cavities, looseness, cracks, inclusions and dimensional defects after grinding on the casting are allowed to be welded. Before welding, the defective parts shall be thoroughly cleaned until the bright metal surface is exposed. Parts that are not allowed to be welded shall be specified in the contract. 4.7.2 Defects exposed during processing or defects found by X-ray inspection may be welded as needed. 69
GB/T6614--.94
4.7.3 Welding repair It should be carried out under vacuum or fluorine protection, and the weld should not have serious oxidation. 4.7.4 The filler wire can generally be made of materials with the corresponding grades of the castings or materials of the same type with lower strength grades, and its quality should comply with the provisions of GB3623. Before welding, the surface of the welding wire should be clean, and if there is oil stain, it should be cleaned. 4.8 Heat treatment
4.8.1 After the casting is repaired by welding, stress relief annealing can be carried out as needed. 4.8.2 For important castings with complex shapes or harsh service conditions, stress relief annealing should be carried out in vacuum when the purchaser requires and indicates it in the contract. The commonly used stress relief annealing system for casting titanium and titanium alloys can be referred to Table 3. The heat treatment system for other alloys shall be determined by negotiation between the two parties.
Alloy brand
7Ti1,ZT12.ZTi3
ZTiAl4
ZTiA15Sn2. 5
7TiA16V4
Temperature, ℃
500~600
550~650
550~650
550~650
Housing time, min
30~60
30~120
30~240
Cooling method
4.8.3 Castings with special requirements for internal quality can be hot isostatic pressing treatment, and the hot isostatic pressing system is determined by negotiation between the two parties. 5 Test method
5.1 The arbitration analysis method for the chemical composition of castings shall be carried out in accordance with GB4698. 5.2 The room temperature tensile test of castings shall be carried out in accordance with GB2 28. The mechanical properties test specimen is recommended to use the R7 specimen of GB6397. 5.3 The casting hardness test shall be carried out in accordance with GB231. 5.4 The surface quality inspection of castings shall be carried out by visual method or in accordance with GB9443. 5.5 The internal quality inspection of castings shall be carried out in accordance with GB5677. 6 Inspection rules
6.1 Inspection and acceptance
6.1.1 The castings shall be inspected by the supplier's technical supervision department to ensure that the product quality meets the requirements of this standard and fill in the quality certificate. 6.1.2 The buyer may inspect the received products in accordance with the provisions of this standard. If the inspection results do not meet the requirements of this standard, the buyer shall submit the matter to the supplier within 6 months from the date of receipt of the product, and the supplier and buyer shall negotiate to resolve the issue. 6.2 Batching
Castings shall be submitted for inspection in batches, and each batch shall consist of castings of the same brand, same raw material batch number, same production process, and same state. 6.3 Inspection Items
Each batch of castings shall be inspected for chemical composition, mechanical properties, geometric dimensions, surface and quality. 6.4 Sampling Location and Sampling Quantity
6.4.1 Chemical Composition Sampling
When conducting chemical composition analysis of castings, samples may be taken from the casting runner, body or mechanical properties specimens cast from the same furnace in any heat of each batch of products, with one sample taken from each batch. 6.4.2 Mechanical Properties Sampling
When measuring the mechanical properties of castings, samples may be taken from the casting body or mechanical properties specimens cast from the same furnace in any heat of each batch of products, with two samples taken from each batch. If the purchaser has special requirements for the sampling location and sampling quantity, they shall be negotiated and stated in the contract. 6.4.3 Geometric dimension inspection sampling
CB/T 6614—94
The geometric dimensions of the first batch of castings and important castings shall be inspected piece by piece. Generally, castings can be inspected randomly. The inspection method shall be determined by negotiation between the two departments. 6.4.4 Surface quality inspection sampling
Castings shall be inspected for surface quality piece by piece. 6.4.5 Non-destructive inspection sampling
When castings need to be inspected for non-destructive inspection, they shall be inspected piece by piece. The inspection parts shall be determined by negotiation between the two parties. 6.5 Repeated test
When conducting mechanical property inspection, if the test result of one sample is unqualified (there is no casting defect inside the sample), double sampling shall be carried out for re-inspection. If there is still one sample unqualified in the re-inspection result, the mechanical properties of the batch of castings are considered unqualified, or they shall be inspected furnace by furnace. Those that are qualified shall be re-grouped for acceptance.
7 Marking, packaging, transportation and storage
7.1 Castings shall be marked or hung with signs indicating: a. Material brand;
b. Batch number and furnace number;
c. Status.
7.2 The packaging, marking, transportation and storage of castings may be carried out in accordance with GB8180. Quality certificate
Each batch of castings shall be accompanied by a quality certificate, indicating: a.
Name of supplier;
Name of casting;
Alloy brand:
Supply status;
Batch number and (or) furnace number of castings;
Number of pieces and weight;
All analysis and inspection results required by the contract and the stamp of the technical supervision department; This standard number;
Factory (or packaging) date.
Additional remarks:
This standard is proposed by China State Shipbuilding Corporation. This standard is under the jurisdiction of the Standard Metrology Institute of China Nonferrous Metals Industry Corporation. This standard was drafted by the 725th Research Institute of China State Shipbuilding Corporation. The 621st Research Institute of Aviation Industry Corporation, Shenyang Foundry Research Institute of the Ministry of Machinery, and Baoji Nonferrous Metals Processing Plant of Nonferrous Metals Industry Corporation participated in the drafting.
The drafters of this standard are Fan Yuli, Xiao Xiyun, Zhou Chunfu, Cheng Guilan, and Zhu Zhongren. 696
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