Seamless Steel Pipe

1.Definition of seamless steel pipe

Seamless pipe is a kind of hollow section without joint around the strip of steel.

2.Seamless steel pipe manufacturing process

Steel Round Bar—Pickling Grinding—Cutting—Heating—Hot Piercing—Punching—Shell Storage—Pickling&Lubrication—Cold-Rolling—Cold-Drawing—Heat Treatment—Physical&Chemical Testing—Straightening—Trim—Size&Surface Inspection—Eddy Current Testing—Hydraulic Testing—Supersonic Testing—Get Oiled—Packing—Warehouse

3.Advantages of seamless steel pipe

1, seamless steel pipe is light, its weight is only 1/5 square steel;

2, seamless steel pipe has corrosion resistance, acid, alkali, salt and atmospheric environment corrosion, high temperature resistance, with good impact resistance and fatigue resistance It doesn’t need maintenance regularly , It can be used more than 15 years;

3, seamless steel pipe tensile strength is more 8-10 times than ordinary steel, elastic modulus is better than steel, with excellent creep resistance, corrosion resistance and shock resistance;

4, seamless steel pipe has excellent mechanical performance and machined easily , etc.

5, seamless steel pipe has highly elastic, reused in mechanical equipment, memoryless, non-deformation, and antistatic.

4.Seamless pipe applications

It used for fluid conveying pipe, boiler plant, engineering, machinery processing plant.

5.Seamless specifications

Product name	Grade	Standard	Specification
Alloy pipe	12Cr1MoVG 12CrMoG 15CrMoG 12Cr2Mo<A335P22> Cr5Mo<A335P5> Cr9Mo<A335P9> 10Cr9Mo1VNb<A335P91> 15NiCuMoNb5<WB36> 12Cr2MoWVTiB<钢研 102>	GB5310-1995 GB6479-2000 GB9948-2006 DIN17175-79 ASTM SA335 ASTM SA213 JISG3467-88 JISG3458-88	∮8-1240*1-200
Stainless steel pipe	0Cr18Ni9<304> 00Cr19Ni10<304L> 00Cr25Ni20<310S> 0Cr17Ni12Mo2<316> 00Cr17Ni14Mo2<316L> 1Cr18Ni9Ti<321> 0Cr18Ni10Ti 0Cr18Ni11Nb<347>	GB/T14975-2002 GB/T14976-2002 GB13296-2007 ASTM A213 ASTM A269 ASTM A312 JIS G3459 DIN 17458	∮6-630*0.5-60
Cryotron	16MnDG、 10MnDG、 09DG 09Mn2VDG、 06Ni3MoDG ASTM A333Grade1 ASTM A333Grade3 ASTM A333Grade4 ASTM A333Grade6 ASTM A333Grade7 ASTM A333Grade8 ASTM A333Grade9 ASTM A333Grade10 ASTM A333Grade11	GB/T18984-2003 ASTM A333	∮8-1240*1-200

High pressure  boiler tube	20G ASTM SA106B/C ASTM SA210A/C ST45.8-III	GB5310-1995 ASTM SA106 ASTM SA210 DIN17175-79	∮8-1240*1-200
High pressure   fertilizer pipe	10 20 16Mn	GB6479-2000	∮8-1240*1-200
Petroleum cracking  steel pipe	10 20	GB9948-2006	∮8-630*1-60
Low pressure pipe	10# 20# 16Mn<Q345A.B.C.D.E>	GB3087-2008	∮8-1240*1-200
Fluid transportation pipe	10#、20#ASTM A106A,B,C、A53A,B 16Mn<Q345A.B.C.D.E>	GB/T8163-2008 ASTM A106 ASTM A53	∮8-1240*1-200
Structure pipe	10#、20#、45#、27SiMn ASTM A53A,B 16Mn<Q345A,B,C,D,E>	GB/T8162-2008 GB/T17396-1998 ASTM A53	∮8-1240*1-200
Casing	J55、K55、N80、L80C90、C95、P110	API SPEC 5CT ISO11960	∮60.23-508.00 *4.24-16.13
Seamless pipe line	A、B、X42、X46、X52、X56、X60、X65、X70、X80L245、L290、L360、L415、L450	API SPEC 5L GB/T9711.1 GB/T9711.2	∮32-1240*3-100
LSAW	20、Q195、Q215A,BQ235A,B、Q345A,B,C,D,E	GB/T13793-1992 GB3091-2001	∮32-630*1-30
SSAW	Q235A-B、Q345A-E	SY/T5037-2000	219-2820*4-20

6.The difference between seamless pipe and welded pipe

1. The raw materials are different

Seamless steel pipe material has ordinary and high quality carbon structural steel (Q215-A ~ Q275-A and 10 ~ 50 steel), low alloy steel (09MnV, 16Mn, etc.), alloy steel, stainless acid-resistant steel, etc.;

The welded pipe is made of steel plate or strip after crimping and welding.

2.Usages are different

Seamless steel pipe is mainly used for petroleum geology drilling pipe, petrochemical cracking pipe, boiler tube, bearing tube and automotive, tractor, aviation high precision structure steel pipe;

Welded pipe is widely used in water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, urban construction.

Welding pipe is for liquid transport: water supply, drainage. For gas transmission: gas, steam, liquefied petroleum gas; For structure，pile pipe, bridge， wharves, roads, building structures, etc.

7.Seamless pipe standard

1. Seamless steel pipe for structure (GBT8162-2008). Mainly used in general structure and mechanical structure. Its representative material (grade): carbon steel, 20, 45 steel; Alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.

2. Seamless steel pipe for conveying fluid (GBT8163-2008).

3. Seamless steel tube for low and medium pressure boiler (GB3087-2008)

4. Seamless steel tube for high pressure boiler (GB5310-2008)

5. Seamless steel pipe for high pressure fertilizer equipment (GB6479-2000)

6. Seamless steel pipe for petroleum cracking (GB9948-2006).

7. Steel pipe for geological drilling (YB235-70)

8. Seamless steel pipe for diamond core drilling (GB3423-82)

9. Oil drilling pipe (YB528-65)

10. Marine carbon steel and carbon manganese steel seamless steel pipes (GB/T 5312-2009)

11. Seamless steel pipe (GB3088-82) for automobile half shaft sleeve pipe

12. High pressure tubing for diesel engine (GB3093-86)

13. Seamless steel tubes with precision inner diameter for hydraulic and pneumatic cylinders (GB8713-88)

14. Cold-drawn or cold-rolled precision seamless steel pipe (GB3639-83)

1 5. Stainless steel seamless steel pipe for structure (GB/T14975-2002)

16. Seamless stainless steel pipe for fluid transport (GB/T14976-2002)

17. Seamless steel pipe for gas cylinders (GB18248-2000).

Gb3093-1986 (high-pressure seamless steel pipe for diesel engine),

GB/T3639-1983(cold drawn or cold rolled precision seamless steel pipe),

GB/T3094-1986(cold-drawn seamless steel tube, special-shaped steel tube),

GB/T8713-1988(Precision inner diameter seamless steel tubes for hydraulic and pneumatic tubes)

Gb13296-1991 (stainless steel seamless steel tubes for boilers and heat exchangers)

GB/T14975-2002(stainless steel seamless steel pipe for structure),

GB/T14976-2002(seamless stainless steel pipe for fluid transport),

GB/T5035-1993(seamless steel pipe for automobile half axle sleeve),

API SPEC5CT-1999(Casing and Tubing Specification), etc.