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Large-diameter thick-walled seamless steel pipe production process and implementation standards 

The manufacturing procedure for large-diameter thick-walled seamless steel pipe is one of the production approach to large-diameter thick-walled seamless steel pipe. The development method would be that the steel refined through the electric furnace is refined by ladle and bet underneath the protection of argon gas. The ingot after bedding is annealed and hot-cut the foot of the riser, heated and punched with a vertical hydraulic press, after which pulled with a horizontal hydraulic press. After stretching, reheating, stretching and stretching, it's heated to around 900 ??C to spray water mist, quenched and tempered, machined by internal and exterior boring, internal and exterior grinding process, non-destructive and shape inspection products. 


The big-diameter thick-walled seamless steel pipe with outer diameter of 325-1066.8mm, wall thickness of 25-162mm and length ?ü8500mm could be created through the approach to the invention. The seamless steel pipe meets the nation's standard and can be used an electrical station along with a high-pressure boiler. Thick-walled seamless steel pipe, and pressure vessel cylinder, oil cylinder, steel pipe for chemical industry, centrifugal casting pipe mold, etc.


Large-diameter thick-walled seamless steel pipe implementation standard

1. Seamless steel pipe for general structure: GB8162-2008 2. Ground seam steel pipe for conveying fluid: GB8163-20083, seamless steel pipe for boiler: GB3087-2008 4. High-pressure seamless pipe for boiler: GB5310-2008 (ST45.8- Type III) 5. High-pressure seamless steel pipe 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 oil cracking: GB9948 -88 9. Special seamless pipe for oil drill collar: YB691-70 10. Seamless steel pipe for automobile semi-axle: GB3088-1999 11. Seamless steel pipe for ship: GB5312-1999 12. Cold attracted cold-folded precision seamless steel pipe: GB3639-1999 13, various alloy tubes 16Mn, 27SiMn, 15CrMo, 35CrMo, 12CrMov, 20G, 40Cr, 12Cr1MoV, 15CrMo


Additionally, you will find GB/T17396-1998 (hot folded seamless steel pipe for hydraulic props), GB3093-1986 (ruthless seamless steel pipe for diesel engine), GB/T3639-1983 (cold attracted or cold folded precision seamless steel pipe), GB /T3094-1986 (cold attracted seamless steel pipe formed steel pipe), GB/T8713-1988 (precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders), GB13296-1991 (stainless seamless steel pipe for boilers as well as heat exchangers), GB/T14975 -1994 (stainless seamless steel pipe for structure), GB/T14976-1994 (stainless seamless pipe for fluid transportation) GB/T5035-1993 (seamless steel pipe for automobile semi-axle casing), API SPEC5CT-1999 (casing and oil pipe) Specs) GB9711.1-1997 (gas transmission), etc.


Product Size

Specification O/D x W/T ( mm ) Weight (kg/m )
12" x SCH 20 323.8 X 6.35 49.72
12" x SCH 40 323.8 X 10.31 79.72
12" x SCH 120 323.8 X 25.40 186.92
14" x SCH 60 355.6 X 15.09 126.68
14" x SCH 80 355.6 X 19.05 158.08
16" x SCH 40 406.4 X 12.70 123.29
18" x SCH 40 457.2 X 14.27 155.91
22" x SCH 80 558.8 X 28.58 373.58
24" x SCH 40 609.6 X 17.48 255.14
26" x SCH 20 660.4 X 12.70 202.83
28" x SCH 30 711.2 X 15.88 272.18
30" x SCH 20 762.0 X 12.70 234.64
32" x SCH 30 812.8 X 15.88 311.95
32" x SCH 40 812.8 X 17.48 342.7
34" x SCH 40 863.6 X 17.48 364.58
36" x SCH 20 914.4 X 12.70 282.36
36" x SCH 30 914.4 X 15.88 351.72
36" x SCH 40 914.4 X 19.05  


zheheng steel is one incorporate of manufacturer, exporter ,consultant ,stockist company specialized in the area of Large-diameter thick-walled seamless steel pipe ,stainless steel tubing , pipe fittings ,flanges and other stainless steel grade accessories . It is one-stop-shop company ,our team have more than 20 years experience in stainless steel field ,especially in heat exchanger tubing and large diameter pipes with ultra-long, ultra-thin, ultra-thick or ultra-large various and some special-purpose projects .



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