The production of titanium and titanium alloy ingot in China started in 1950s and industrialized production of titanium processing material was realized in 1964. With the popularity of understanding of the characteristics of titanium, titanium has high specific strength, corrosion resistance, no magnetism, low damping, high and low temperature performance, compatible with the advantages of good biocompatible carbon composite materials to be fully explored and used, known as the "space metal" and "marine metal", has been widely used in aerospace, ships, marine engineering, chemical industry, electric power, metallurgy, medical, sports and leisure industry. Therefore, the use of titanium will also become an important measure of the overall strength of the country.
1. technology status
As everyone knows, effects of titanium has a very strong chemical activity, high melting point and interstitial impurity content on the performance is very sensitive to characteristics of titanium and titanium alloy casting ingot smelting must be carried out in a vacuum or inert atmosphere, therefore, to the chemical composition of titanium and titanium alloy ingot composition uniformity control and metallurgical quality control technology demands a very high.
2. standardization of ingot of titanium and titanium alloy
Although China began the production of titanium and titanium alloy processing materials since the 60s of last century, however, the national standards, trade standards or local standards for titanium and titanium alloy ingots have not been found for nearly half a century. In the actual production and transaction process, the main use of enterprise standards, or by the supply and demand sides to determine technical requirements. The main reason for this phenomenon is that the production and use of domestic titanium and titanium alloy products have been relatively small for a long time. In late 1990s, with the development of technology and industry to raise awareness of titanium and titanium alloy products, especially in the past 10 years, international and domestic industry of titanium products demand, promote the rapid development of domestic titanium industry.
3. production equipment
At present, the industry of titanium and titanium alloy ingot production equipment of vacuum in the standard recommended the most widely used arc furnace and electron beam cold hearth in two kinds of equipment.
4. the head, end and chamfer of the ingot
At present the processing enterprise's actual production requirements and technical requirements, and the process of transportation and storage considerations, the standard should be the head car to the edge of the ingot, the ends chamfering edges should be treated, not less than specified chamfer size 20mm * 40 degrees to 50 degrees.
5. phase transition temperature of ingot
The temperature of the transition point of the ingot has certain guiding significance for the ingot bloom and the subsequent processing. In general, the ingot composition is determined, the beta transition temperature range has been basically as a fixed value, usually by empirical formula, metallography or differential thermal method to determine.
6. ultrasonic inspection of ingots
The ingot casting shrinkage is inevitable, but in the production process of raw material in different forms of products, in order to make full use of resources, improve the rate of finished products, available in different process of ingot casting defects of shrinkage was effectively removed. Therefore, the standard does not require the removal of shrinkage hole in ingot casting, and can be flexibly handled according to the demand of the buyer. For the convenience of the ingot in the follow-up is used to control the shrinkage of the casting parts production and processing of products, ensure the internal quality of processing products, the standard is put forward to determine the ultrasonic inspection of ingot casting shrinkage from the ingot head distance, but not as a mandatory requirement.
7. the surface quality of ingot
The quality of ingot surface has a great influence on the subsequent processing. Surface defects such as cold separation, crack, hole and sill are easy to cause cracking or even fracture of ingot, which will greatly affect the yield and quality of products. Therefore, the standard specifies the surface quality of the ingot in detail, emphasizing that the ingot shall be delivered on machined surface, and specifies the surface quality requirements of the ingot side and two end faces.
8. packing, transportation and storage of ingots
The standard gives 3 specific ways of packing the ingot, which are also available in other packaging methods. Reasonable provisions were also made on signs, transportation and storage. For the convenience of transportation and packaging, and ensure the safety of transportation, it provides a way of appendix, wooden pallet transport distance, large ingot packing specifications can be provided for the selection criteria in the appendix. The steel packing method can be carried out in accordance with the provisions in the appendix to the standard to ensure the safety of personnel, equipment and materials during transportation and storage.
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