In what engineering are small diameter seamless steel pipes used?

　　Seamless steel pipes with small outer diameters can be called small-diameter seamless steel pipes. Small-diameter seamless steel pipes can also be divided into: seamless small-diameter steel pipes and straight-seam (also called welded) small-diameter seamless steel pipes. Generally Steel pipes with an outer diameter of less than 89mm and more than 4mm can be collectively referred to as small-diameter seamless steel pipes.

　　Shengtian Group Material of small diameter seamless steel pipe: 10# 20# 35# 45# 16Mn 27SiMn 15CrMo 12Cr1MoV 10CrMo910 T91 P91 J55 K55 Q345 Cr5Mo2)20#, 35#, 45#, 16Mn, 27SiMn3)10#, 20#, 35#, 45#, 16Mn, 27SiMn, 12Cr1MoV, 10CrMo910, 15CrMo, etc.

　　1. Structural seamless steel pipes (GB/T8162-2008) are seamless steel pipes used for general structures and mechanical structures.

　　2. Seamless steel pipes for fluid transportation (GB/T8163-2008) are general seamless steel pipes used to transport fluids such as water, oil, and gas.

　　3. Seamless steel pipes for low and medium pressure boilers (GB3087-1999) are used to manufacture superheated sanitary stainless steel pipes for low and medium pressure boilers of various structures.

　　High-quality carbon structural steel hot-rolled and cold-drawn (rolled) seamless steel pipes for steam pipes, boiling water pipes and superheated steam pipes for locomotive boilers, large smoke pipes, small smoke pipes and arch brick pipes.

　　4. Seamless steel pipes for high-pressure boilers (GB5310-1995) are high-quality carbon steel, alloy steel and stainless heat-resistant steel seamless steel pipes used for the heating surfaces of water tube boilers with high pressures and above.

　　5. High-pressure seamless steel pipes for fertilizer equipment (GB6479-2000) are high-quality carbon structural steel and alloy steel seamless steel pipes suitable for chemical equipment and pipelines with working temperatures of -40~400℃ and working pressures of 10~30Ma.

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

　　Shengtian Group Products electric-welded and seamless pipe facilities meet the internationally recognized quality system requirements of ISO9001 and API Q1 and our seamless facilities hold PED certifications.