Large-diameter thick-walled seamless steel pipes are mainly reflected in:
1. Large diameter: It is generally believed that seamless steel pipes with diameters above 219 are large-diameter seamless pipes, those with diameters less than 76 are small-diameter seamless pipes, and those in the middle are considered conventional seamless pipes.
2. Thick-walled seamless steel pipe: It is generally believed that the wall thickness/pipe diameter equal to 0.02 is the dividing line between thick-walled steel pipes and thin-walled steel pipes. The wall thickness/pipe diameter less than 0.02 is a thin-walled steel pipe, and the wall thickness/pipe diameter greater than 0.02 is a thick-walled steel pipe.
Large-diameter thick-walled seamless steel pipes are widely used, and their applications have been summarized below.
It is mainly used in water supply engineering, the petrochemical industry, the chemical industry, the electric power industry, agricultural irrigation, and urban construction.
For liquid transportation: water supply and drainage.
For gas transportation: coal gas, steam, liquefied petroleum gas.
For structural purposes: piling pipes, bridges; pipes for docks, roads, building structures, etc.
Seamless steel pipe implementation standards
1. Seamless steel pipes for general structural use: GB8162-2008
2. Ground seam steel pipe for conveying fluid: GB8163-2008
3. Seamless steel pipes for boilers: GB3087-2008
4. High-pressure seamless pipes for boilers: GB5310-2008 (ST45.8-Ⅲ type)
5. High-pressure seamless steel pipes for fertilizer equipment: GB6479-1999
6. Seamless steel pipe for geological drilling: YB235-70
7. Seamless steel pipe for oil drilling: YB528-65
8. Seamless steel pipe for petroleum cracking: GB9948-88
9. Special seamless pipe for oil drill collars: YB691-70
10. Seamless steel pipe for automobile half shaft: GB3088-1999
11. Seamless steel pipe for ships: GB5312-1999
12. Cold drawn and cold rolled precision seamless steel pipe: GB3639-1999
13. Various alloy tubes 16Mn, 27SiMn, 15CrMo, 35CrMo, 12CrMov, 20G, 40Cr, 12Cr1MoV, 15CrMo
In addition, there are GB/T17396-1998 (hot-rolled seamless steel pipe for hydraulic props), GB3093-1986 (high-pressure seamless steel pipe for diesel engines), GB/T3639-1983 (cold-drawn or cold-rolled precision seamless steel pipe), GB /T3094-1986 (cold drawn seamless steel pipe special-shaped steel pipe), GB/T8713-1988 (precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders), GB13296-1991 (stainless steel seamless steel pipe for boilers and heat exchangers), GB/T14975 -1994 (stainless steel seamless steel pipe for structural use), GB/T14976-1994 (stainless steel seamless steel pipe for fluid transportation) GB/T5035-1993 (seamless steel pipe for automobile half-shaft casing), API SPEC5CT-1999 (casing and oil pipe Specification) GB9711.1-1997 (natural gas transmission), etc.
Post time: May-11-2024