Since 1957, GECo has made hexagonal boron nitride into cubic boron nitride under the action of catalysts in ultra-high pressure and high-temperature equipment. The main countries producing cubic boron nitride in the world are: China, the United States, GECo, the Soviet Union and Japan. In 1981, De Beers Co had estimated the world sales or world production of cubic boron nitride: in 1977, the world sales value of cubic boron nitride grinding wheels was converted into 4.8 million carats, according to diamonds and cubes from Western countries. Boron nitride composition ratio, it can be considered that the sales volume of cubic boron nitride in western countries was about 1.8 million carats in 1977, and the sales volume of cubic boron nitride in the former Soviet Union (including Eastern Europe) was more than 3 million carats. The composition ratio of diamond and cubic boron nitride for several major cubic boron nitride countries. The composition of diamond and cubic boron nitride was investigated in 1982 by Philip of Baumgold Industrial Diamond Company of the United States. It is believed that the production of cubic boron nitride in the world (excluding the Soviet Union and Eastern European countries) was about 300-3.6 million carats in 1981. Its distribution is: 35% in Western Europe, 30% in Japan, and 5% in other countries. If we speculate that the sales volume of cubic boron nitride in the United States in 1981 was 90 to 1.08 million carats, Japan was in the three years from 1977 to 1980. The annual average growth rate is over 50%, and it is estimated that it will gradually stabilize at a growth rate of 15% in the next few years. Due to the lack of tungsten resources in the Soviet Union, the quality and use of cemented carbide tools are limited. In order to meet the needs of processing difficult materials such as steel and heat-resistant alloys, we will vigorously develop cubic boron nitride and its products, if 15~20% The growth rate is estimated to be about 7 to 9 million carats in the Soviet Union in 1982. It is conservatively estimated that the world production in 1983 was about 11 to 12 million carats. In 1976, Japan’s Mitsui Grinding Wheel Co., Ltd.’s Tsujiro Shojiro predicted that the Soviet Union (including Eastern European countries) would need 10 million carats of cubic boron nitride in 1980. In 1982, when Norwegian company Nornet visited China, it pointed out that the annual growth rate of cubic boron nitride grinding wheels is 20%~30%, even in the case of economic downturn, it still develops at this speed. (1) The performance of cubic boron nitride is very good. As long as the research is strengthened in application technology, its application field is very broad. Although the total output is far less than that of diamond, its development speed is fast, which fully demonstrates cubic nitrogen. The economic benefits of boron and its products in the processing field are very obvious and have great potential for development. (2) In the development process of cubic boron nitride, due to the incompatibility of the machine tool, the performance of cubic boron nitride is fully exerted. Practice has shown that the development and application of cubic boron nitride has promoted the reform of machine tools, and the reform of machine tools has accelerated the development of cubic boron nitride. (3) The actual processing cost of cubic boron nitride is low. (4) Cubic boron nitride is a good material for energy saving. In recent years, foreign cubic boron nitride production technology has made new progress. The specific performance is that the granularity is constantly increasing, and the number of varieties is increasing. For example, the CBN550 series products introduced by GECo in the United States are an example. The series products have the following characteristics: 1. Microcrystalline structure and good thermal stability; 2. Supply particle size is increased to US mesh 20/30; 3. Due to microcrystals Structure, micro-knife crushing characteristics, also suitable for high-gloss processing, taking the grinding bearing as an example, with CBN1 or CBN500 type up to 10um finish, while CBN550 can reach 5um. It is expected that this kind of abrasive will achieve new effects in the following aspects: 1. For high-speed and strong grinding of large-diameter resin grinding wheel; 2. Electroplating grinding wheel to cut off metal in large amount by milling, and achieve high finish; 3. For honing Desire to achieve high productivity and high geometric accuracy. In recent years, Scandiamant has been working on the development of composite materials. In 1981, it introduced the technology of Amborite (polycrystalline cubic boron nitride) from the De Beers Co diamond research laboratory in Johannesburg. So, an Amborite production line was added in the factory. Now Scandiamant is already a major supplier of De Beers Co in Amborite.
This classification including Rectangular Hollow Section Steel Pipe, usually they are used for
construction purpose, also some customer use them for car , billboard, stents,
fence etc.
Jinan Xin Jiyuan is specialized in ERW and
Seamless square&rectangular tube/pipe, hollow section structure pipe, and
galvanized pipe in China. Annual output reaches 1.5 million tons. We have 2 production
lines, could producte square pipe from 20*20*1mm to 600*600*35mm, rectangular
pipe from 20*30*1.2mm to 600*800*35mm. Xin Jiyuan can manufacture square
rectangular pipes as per the standards of ASTM A500, JIS G3466, EN10219, EN10210,DIN2240,
BS1387, AS1163. Steel
Grade: A500 GR.A/B/C/D, SS400, STKR490, S355JR, S275JO, S275J2, S355J0, S355J2,
C350, C350 L0 ect.
We
have three heat treatment furnace, two furnace of 100 mt, and one furnace of
300mt, that means we could finish 500mt goods at the same time.
Rectangular Hollow Section Steel Pipe
Rectangular Hollow Section Steel Pipe,Rectangular Hollow Section Steel Pipe Tube,Square Hollow Section Steel Pipe,Quality Hollow Section Steel Pipe
JINAN XIN JIYUAN SPECIAL SECTION TUBE CO., LTD. , http://www.squarepipes.com