stainless steel seamless pipes' classification and development

The stainless steel pipe is safe, reliable, hygienic and environmentally friendly, economical, the thin wall of the pipe and the successful development of the new reliable, simple and convenient connection method, so that it has more advantages that other pipes are irreplaceable, and the application in engineering will be more and more The use will become more and more popular, and the prospects are promising.


Stainless steel seamless tube

With the implementation of China's reform and opening up policy, the national economy has experienced rapid growth, and urban residential buildings, public buildings and tourist facilities have been extensively built, putting new demands on hot water supply and domestic water supply. In particular, water quality issues are becoming more and more important, and requirements are constantly improving. Due to its corrosiveness, the commonly used pipe of galvanized steel pipe will gradually withdraw from the historical stage under the influence of relevant national policies. Plastic pipes, composite pipes and copper pipes have become common pipes of pipeline systems. However, in many cases, stainless steel pipes are more advantageous, especially thin-walled stainless steel pipes with a wall thickness of only 0.6-1.2 mm in high-quality drinking water systems, hot water systems, and water supply systems that put safety and hygiene first. Safe, reliable, environmentally friendly, and economical. It has been proved by domestic and international engineering practice that it is one of the best, new, energy-saving and environment-friendly pipes for water supply systems. It is also a very competitive water supply pipe, which will definitely improve water quality and improve people's living standards. Comparable role.

Stainless steel seamless pipe technical indicators:


Widely classified application of stainless steel seamless tubes:

1. Stainless steel seamless steel pipe for structure (GB/T8162-1999) is a seamless steel pipe used for general structure and mechanical structure.

2. Stainless steel seamless steel pipe for fluid transportation (GB/T8163-1999) is a general seamless steel pipe for conveying water, oil, gas and other fluids.

3. Stainless steel seamless steel pipe for low and medium pressure boilers (GB3087-1999) is used for manufacturing superheated steam pipes, boiling water pipes and locomotive boiler superheated steam pipes, large smoke pipes, small smoke pipes and arches for various structures. Hot-rolled and cold-drawn (rolled) seamless steel tubes of high-quality carbon structural steel for brick tubes.

4. Seamless steel pipe for high-pressure boiler (GB5310-1995) is a high-quality carbon steel, alloy steel and stainless steel heat-resistant steel seamless pipe for the heating surface of water tube boilers for high pressure and above.

5. High-pressure stainless steel seamless steel pipe for chemical fertilizer equipment (GB6479-2000) is a high-quality carbon structural steel and alloy steel seamless steel pipe suitable for chemical equipment and pipelines with working temperature of -40~400 °C and working pressure of 10~30Ma. .

6. Stainless steel seamless steel pipe for petroleum cracking (GB9948-88) is a seamless steel pipe for furnace tubes, heat exchangers and pipes suitable for petroleum refineries.

7. Steel pipe for geological drilling (YB235-70) is a steel pipe used for core drilling by the geological department. It can be divided into drill pipe, drill collar, core pipe, casing and sedimentation pipe according to the application.

8. Seamless steel pipe for diamond core drilling (GB3423-82) is a seamless steel pipe for drill pipe, core rod and casing used for diamond core drilling.

9. Oil drilling pipe (YB528-65) is a seamless steel pipe used for thickening or external thickening at both ends of oil drilling. There are two kinds of steel pipe and no wire, the wire pipe is connected by a joint, and the non-wire pipe is welded by a butt welding method and a tool joint.

10. Carbon steel stainless steel seamless steel pipe for ships (GB5213-85) is a carbon steel seamless steel pipe for the manufacture of ship class I pressure pipe system, class II pressure pipe system, boiler and superheater. The working temperature of the carbon steel seamless steel pipe wall does not exceed 450 ° C, and the working temperature of the alloy steel seamless steel pipe wall exceeds 450 ° C.

11. Stainless steel seamless steel pipe for automobile semi-axle casing (GB3088-82) is a high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe for automobile semi-axle casing and axle axle of drive axle.

12. High-pressure oil pipe for diesel engine (GB3093-2002) is a cold drawn seamless steel pipe for the manufacture of high-pressure pipes for diesel injection systems.

13. Precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders (GB8713-88) is a cold drawn or cold rolled precision seamless steel pipe with precision inner diameter for the manufacture of hydraulic and pneumatic cylinders.

14. Cold-drawn or cold-rolled precision seamless steel pipe (GB3639-2000) is a cold-drawn or cold-rolled precision seamless steel pipe with high dimensional accuracy and good surface finish for mechanical structures and hydraulic equipment. The use of precision seamless steel tubes to manufacture mechanical structures or hydraulic equipment can greatly reduce machining time, improve material utilization, and improve product quality.

15. Stainless steel seamless steel pipe for structure (GB/T14975-2002) is hot-rolled stainless steel made of corrosion-resistant pipes and structural parts and parts widely used in chemical, petroleum, textile, medical, food, machinery and other industries. Squeeze, expand) and cold drawn (rolled) seamless steel tubes.

16. Stainless steel seamless steel pipe for fluid transportation (GB/T14976-2002) is a hot-rolled (extruded, expanded) and cold drawn (rolled) seamless steel pipe made of stainless steel for conveying fluid.

17. Shaped seamless steel pipe is a general term for seamless steel pipes of other cross-section shapes other than round pipes. According to the shape and size of the cross-section of the steel pipe, it can be divided into the same wall thickness profiled seamless steel pipe (code D), the unequal wall thickness profiled seamless steel pipe (code BD), and the variable diameter profiled seamless steel pipe (code BJ). Shaped seamless tubes are widely used in a variety of structural parts, tools and mechanical parts. Compared with the round pipe, the special-shaped pipe generally has a large moment of inertia and a section modulus, and has a large bending and torsion resistance, which can greatly reduce the structural weight and save the price of the steel seamless steel pipe.

In the building water supply system, since the galvanized steel pipe has ended its centuries-old history, various new plastic pipes and composite pipes have been rapidly developed, but various pipes have some disadvantages to varying degrees, far from being able to fully adapt to the water supply pipe. The needs of the department and the state's requirements for drinking water and related water quality. Therefore, the experts predict that the building water supply pipe will eventually return to the era of metal pipes. According to the application experience abroad, the thin-walled stainless steel pipe is recognized as one of the best comprehensive pipes in the metal pipe.

The time for the promotion and application of domestic thin-walled stainless steel pipes has matured:

Thin-walled stainless steel pipes, which were only produced and used in China in the late 1990s, are the emerging newcomers in the field of pipe materials, and have been widely used in pipelines for building water supply and drinking water.

The durable construction of thin-walled stainless steel pipes has been recognized by the engineering community, and relevant parties are beginning to reduce wall thickness and lower prices in order to facilitate further promotion. In particular, the small-diameter stainless steel pipe is not expensive, so the supporting connection method, the reliability and price of the pipe fittings are the main factors determining its development. Domestically, in Sichuan, Guangdong, Zhejiang, Jiangsu and other places, developers have independently developed connection technology and pipe fittings, which is a promising pipe. The Ministry of Construction and related departments also attach great importance to this new type of pipe. According to the China Technology Market Management Promotion Center and the National Science and Technology [2001] No. 71 document, the promotion and application of “high-diameter wall ratio high-precision stainless steel medium and high-pressure water supply pipes and supporting facilities” In the notice of pipe fittings and special technology, it is known that the promotion and application of thin-walled stainless steel pipe technology and products are of great significance for improving the grade of modern buildings in China and improving and guaranteeing the water quality of water supply.

At the same time, the Ministry of Construction attaches great importance to the promotion and application of thin-walled stainless steel pipes. The industry standard for Thin Wall Stainless Steel Water Pipes was released in 2001. The relevant pipeline engineering technical regulations and installation atlas, the Ministry of Construction has issued a document, is being prepared by Tongji University. At present, Sichuan, Guangdong, Zhejiang, Jiangsu and other places have professional manufacturers to produce thin-walled stainless steel tubes, and the products have matured. Therefore, the time has come to promote and apply.