Seamless steel pipe is a kind of steel pipe without weld which is manufactured by hot processing method such as perforation hot rolling. When necessary, the hot-worked pipe can be further cold worked to the desired shape, size and performance.
(1) Carbon steel seamless steel pipe material grade:
10#, 20#, 09MnV, 16Mn, 20G,GR.B, X52, X65, etc
Applicable standards:
GB8163 "Seamless Steel Pipe for Fluid Transportation"
GB/T9711 "Oil and Gas industry steel pipe delivery technical conditions"
GB6479 "High Pressure seamless steel pipe for fertilizer Equipment"
GB9948 Seamless Steel Pipe for Petroleum Cracking
GB3087 "Seamless steel pipe for Low and medium pressure boiler"
GB/T5310 "Seamless steel pipe for high-pressure boilers"
Scope of application: Designed temperature less than 350℃, pressure less than 10MPa of oil, oil and gas and public media.
Material grade: 10#, 20G, 16Mn, GR.B, X52, X65, etc.
Scope of application: low and medium pressure boiler superheated steam, boiling water, etc.
Material grade: 20G, etc.
(2) low alloy steel seamless steel pipe
Petrochemical production equipment, commonly used chromium molybdenum steel and chromium molybdenum vanadium steel seamless steel pipe standards are
GB9948 Seamless Steel Pipe for Petroleum Cracking
GB6479 "High Pressure seamless steel pipe for fertilizer Equipment"
GB/T5310 "Seamless steel pipe for high-pressure boilers"
(3) Stainless steel seamless steel pipe
Commonly used stainless steel seamless steel pipe standards are:
GB/T14976, GB13296, GB9948, GB6479, GB5310 a total of five standards. Among them, only two or three stainless steel material grades are listed in the last three standards, and they are not commonly used material grades.
Therefore, when the stainless steel seamless steel pipe standard is selected in the project, GB/T14976 and GB13296 standards are basically selected.
Stainless steel material grade: 304, 304L, 316, 316L, etc., suitable for the transport of general fluids.
GB13296 "Stainless Steel seamless steel pipe for boiler and heat exchanger" :
304L, 316L has excellent corrosion resistance, under certain conditions, can replace stable stainless steel (321, 347) for corrosion resistance to the medium; The high temperature mechanical properties of ultra-low carbon stainless steel are low, and it is generally only used under the condition of temperature below 525℃; Stable austenitic stainless steel has good corrosion resistance and high temperature mechanical properties, but the Ti in 321 is easy to be oxidized and lost in the welding process, thereby reducing its corrosion resistance, its price is higher, this kind of material is generally used in more important occasions, 304, 316 has general corrosion resistance, cheap, so it is widely used.
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