1.Project Name:R & D and industrialization of new malleable cast iron pipe fittings

2. completed by: Hebei Jianzhi Casting Group Co., Ltd.

3. to declare awards:Science and Technology Progress Award

4. Reward Level Volunteer: □ First class only; □ Second class and above; ■ Third class and above.

Science and technology field to which the 5. belongs:metal casting technology

6.SimpleBackground:

In large-scale modern economic construction, all kinds of liquid, gas transportation, the use of pipelines is the most convenient, safest, fastest, most economical and most efficient method. With the development of China's energy, water conservancy, urban construction, new energy and other engineering construction, the demand for high-quality pipe fittings is increasing. In order to comply with the concept of creating high-efficiency, energy-saving and environmental protection products advocated by the state, cupola is widely used as a melting tool and cast pig iron is the main raw material for the pipe casting industry. In the production of malleable cast iron pipe fittings, there are many problems such as high energy consumption, serious pollution, easy production of "ash parts" and low casting qualification rate, by optimizing the raw material ratio and electric furnace melting process, the matrix organization of the casting blank is improved, the performance of the product is stabilized, the phenomenon of "gray parts" is reduced, and the scrap rate of the product casting is reduced.

Main Technical Contents and Innovation Points of 7.:

In view of the problems of large energy consumption, serious pollution, easy production of "ash parts" and low casting qualification rate in the production of malleable cast iron pipe fittings, our company has developed a medium frequency electric furnace melting process through technical research, using scrap machine iron and scrap steel as the main raw materials, and optimizing the raw material ratio and electric furnace melting process, the matrix organization of the casting blank is improved, the performance of the product is stabilized, the phenomenon of "gray parts" is reduced, and the scrap rate of the product casting is reduced.

Its technological innovation mainly has the following four points:

1. Invented the method of using recycled waste to produce malleable cast iron pipe fittings, turning waste into treasure and realizing waste recycling;

2, the development of high precision, good wear resistance of the whole pearlite plate,Ensure the stability of the appearance quality and accuracy of the product;

3. Improve the graphitization annealing process, optimize the distribution and morphology of graphite, and improve the mechanical properties of the product;

4, invented the Masteel pipe galvanized post-processing equipment, developed automatic internal and external screw processing machine and other equipment.,Improve the machining accuracy of the pipe thread, improve the air tightness of the product, and facilitate the installation and use of the site..

8. technical and economic indicators (social welfare items may not be filled in):

1. Mechanical properties: tensile strength ≥ 330MPa

Elongation: ≥ 8%

2. Pipe thread accuracy: it shall comply with the provisions of GB/T 7306.1 and 7306.2

3. Included angle of pipe thread axis: ≤ ± 0.5 °

Application and promotion of 9. and its economic and social benefits:

This product can be widely used in the nominal size (DN)10~150 to transport water, oil, air, gas, steam with the general pipeline connection field.

1. Economic benefits

December 2016The project was put into production in January,After reaching production, the annual increase was 35000 tons, the new sales revenue was 0.35 billion yuan, the profits and taxes paid were more than 5000 million yuan, and the annual foreign exchange was more than 1500 million US dollars.

2. Social benefits

The successful development of "new malleable cast iron pipe fittings" has enabled my country to reach a new level in the field of malleable cast iron pipe fittings. At the same time, it has promoted the production and development of malleable cast iron pipe fittings industry. It can consume about 100000 tons of waste machine iron and scrap steel every year. Turning waste into treasure meets the requirements of circular economy, energy saving and emission reduction advocated by the world;

The product has excellent mechanical properties, high thread precision, good sealing performance, and reduced installation costs. Similar products have the highest cost performance. The tensile strength of the new malleable cast iron pipe fittings is more than 10% higher than the national standard. Elongation is more than 33% higher than the national standard. The dimensional accuracy of the base surface of the new malleable cast iron pipe fittings is higher than the national standard. The national standard stipulates 1-1/4 buckles, and the product of this project can be guaranteed within 1 buckles.

Therefore, the successful development of "new malleable cast iron pipe fittings" has significant economic and social benefits.