Carbon Steel Pipe

Carbon steel pipes are also called cs pipes. The general carbon steel pipe is made of 10, 20, 30, 35, 45 and other high-quality carbon steel 16Mn, 5MnV and other low-alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steel hot-rolled or Cold rolled. Seamless pipes made of low carbon steel such as 10 and 20 are mainly used for fluid conveying pipes. 45, 40Cr and other medium carbon steel seamless pipes are used to make mechanical parts, such as the force parts of automobiles and tractors.

• Welded Carbon Steel Pipe
• Seamless Carbon Steel Pipe
• Standard & Grade: A53-Grade B, A106-Grade B, API5L-Grade B/X42/X52/X60

Types of Carbon Steel Pipes

Carbon steel pipes are divided into two types: hot rolled and cold rolled (drawn) steel pipes.
Hot-rolled carbon steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.
Cold-rolled carbon steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, other steel pipes, and also includes carbon thin-walled steel pipe, alloy thin-walled steel pipe, Rust thin-walled steel pipe, special-shaped steel pipe. The outer diameter of hot-rolled seamless pipe is generally larger than 32mm, the wall thickness is 2.5-75mm, the outer diameter of cold-rolled seamless steel pipe can be up to 6mm, the wall thickness can be up to 0.25mm, the outer diameter of thin-walled pipe can be 5mm, and the wall thickness is less than 0.25mm. Cold rolling is more accurate than hot rolling.
General carbon steel pipe: It is made of low-alloy structural steel such as 16Mn, 5MnV, such as 10, 20, 30, 35, 45, etc., or alloy steel such as 40Cr, 30CrMnSi, 45Mn2, 40MnB, etc., which is hot rolled or cold rolled. Seamless pipes made of low carbon steel such as 10 and 20 are mainly used for fluid conveying pipes. 45, 40Cr and other medium carbon steel seamless pipes are used to make mechanical parts, such as the force parts of automobiles and tractors. Generally, carbon steel pipes are required to ensure strength and flattening tests. The hot rolled steel pipe is delivered in a hot rolled state or a heat treated state; the cold rolling is delivered in a heat treated state.

Welded Carbon Steel Pipe

Specification

ERW Steel Pipe
Pipe Type: ERW Pipe, ERW Steel Pipe, Electric Resistance Welded Pipe
Application: For Low Pressure Fluid Transmission, Machinery Manufacturing
Specification:
OD: 21.3mm ~ 660mm
WT: 1mm ~ 17.5mm
LENGTH: 0.5mtr ~ 22mtr (5.8/6/11.8/12 meters, SRL, DRL)
Standard & Grade: ASTM A53, Grade A/B/C
End: Square Ends/Plain Ends (straight cut, saw cut, torch cut), Beveled/Threaded Ends
Surface: Bare, Lightly Oiled, Black/Red/Yellow Painting, Zinc/Anti-corrosive Coating
Packing: Bundled/In Bulk, Plastic Caps Plugged, Waterproof Paper Wrapped
ERW Steel Pipe
Pipe Type: ERW Pipe, ERW Steel Pipe, Electric Resistance Welded Pipe
Application: For Low Pressure Fluid Transmission, Machinery Manufacturing
Specification:
OD: 21.3mm ~ 660mm
WT: 1mm ~ 17.5mm
 LENGTH: 0.5mtr ~ 22mtr (5.8/6/11.8/12 meters, SRL, DRL)
Standard & Grade: ASTM A53, Grade A/B/C
End: Square Ends/Plain Ends (straight cut, saw cut, torch cut), Beveled/Threaded Ends
Surface: Bare, Lightly Oiled, Black/Red/Yellow Painting, Zinc/Anti-corrosive Coating
Packing: Bundled/In Bulk, Plastic Caps Plugged, Waterproof Paper Wrapped
LSAW Steel Pipe
Pipe Type: Longitudinal Welded Pipe, Longitudinal Submerged Arc Welded Pipe
Application: Used for Fluids Transmission, Structural Support in Industrial Construction
Specification:
OD: 406mm ~ 1422 mm
WT: 6.4mm ~ 44.5mm
LENGTH: 5mtr ~ 12mtr
Standard & Grade: ASTM A53 Grade A/B/C
Ends: Square Ends/Plain Ends (straight cut, saw cut, torch cut), Beveled/Threaded Ends
Surface: Bare, Lightly Oiled, Black/Red/Yellow Painting, Zinc/Anti-corrosive Coating
Packing: Bundled/In Bulk, Plastic Caps Plugged, Waterproof Paper Wrapped
Spiral Welded Pipe
Pipe Type: SSAW Pipe, SSAW Steel Pipe, Spiral Steel Pipe, Welded Spiral Pipe
Application: Fluids Transmission Service, Ordinary Structural Support
Specification:
OD: 219.1mm ~ 3500mm 
WT: 6mm ~ 25mm (Up to 1”)
LENGTH: 6mtr ~ 18mtr, SRL, DRL
Standard & Grade: ASTM A53 Grade A/B/C, AWWA C200
End: Beveled Ends, Square Cut, With LTC/STC/BTC/VAM Connection
Surface: Bare, Lightly Oiling, Black Painting, Anti-corrosion Coating(FBE/2PE/3PE)
Packing: In Bulk, Ends Protector on Both Sides, Waterproof Materials Wrapped
API 5L Line Pipe
Pipe Type: Line Pipe, API Line Pipe, Carbon Steel Line Pipe
Application: For Fluid Transmission in the Oil and Gas Industry
Specification:
OD: 219.1mm ~ 610mm
WT: 3.25mm ~ 17.5mm
LENGTH: 0.5mtr ~ 22mtr (5.8/6/11.8/12 meters, SRL, DRL)
Standard & Grade: API 5L PSL1/PSL2, GR.B/X42/X46/X52/X56/X60/X65/X70
End: Square Ends/Plain Ends (straight cut, saw cut, torch cut), Beveled/Threaded Ends
Surface: Bare, Lightly Oiled, Black/Red/Yellow Painting, Zinc/Anti-corrosion Coating
Packing: Bundled/In Bulk, Plastic Caps Plugged, Waterproof Paper Wrapped

Seamless Carbon Steel Pipe

Specification

Seamless Steel Pipe
Pipe Type: Seamless Pipe, Seamless Carbon Steel Pipe, Carbon Steel Seamless Pipe
Application: For High Temperature Fluids Transmission (oil, gas, water, steam etc.)
Specification:
OD: 1/8” ~ 48” (10.3 ~ 1219mm)
WT: SCH 10 ~ 160, SCH STD, SCH XS, SCH XXS
LENGTH: Fixed Length (5.8/6/11.8/12mtr), SRL, DRL
Standard & Grade: ASTM A106, Grade A/B/C
Ends: Square Ends/Plain Ends (straight cut, saw cut, torch cut), Beveled/Threaded Ends
Surface: Bare, Lightly Oiled, Black/Red/Yellow Painting, Zinc/Anti-corrosive Coating
Packing: Bundled/In Bulk, Plastic Caps Plugged, Waterproof Paper Wrapped
API 5L Line Pipe
Pipe Type: Line Pipe, API Line Pipe, Seamless Line Pipe, Carbon Steel Line Pipe
Application: For Pipeline Transportation in petroleum and natural gas industries
Specification:
OD: 2” ~ 26” (50.8 ~ 660mm)
WT: SCH 10 ~ 160, SCH STD, SCH XS, SCH XXS
LENGTH: Fixed Length (5.8/6/11.8/12mtr), SRL, DRL
Standard & Grade: API 5L, PSL1/PSL2, GR.A/B/X42/X46/X52/X56/X60/X65/X70/X80
Ends: Square Ends/Plain Ends (straight cut, saw cut, torch cut), Beveled/Threaded Ends
Surface: Bare, Lightly Oiled, Black/Red/Yellow Painting, Zinc/Anti-corrosive Coating
Packing: Bundled/In Bulk, Plastic Caps Plugged, Waterproof Paper Wrapped

Manufacturing Process of Carbon Steel Pipe

Carbon steel pipe is divided into seamless pipe and welded pipe. We introduce the manufacturing methods of two types of steel pipes:

Seamless steel pipe production process

COLD DRAWN SEAMLESS STEEL PIPE PROCESS

round tube → heating → perforation → Heading → annealing → pickling → oiled (copper) → multi-pass cold drawn (cold rolled) → blank tube → heat treatment → straightening →hydrostatic testing (testing) → mark → storage.

The general cold strip mills, volume should go through continuous annealing (CAPL unit) to eliminate cold hardening and rolling stress, or batch annealing reach the mechanical properties of the corresponding standard specifies. Cold rolled steel surface quality, appearance, dimensional accuracy better than hot-rolled plate, and right-rolled thin product thickness is about 0.18mm, so the majority of users favor.

Cold rolled steel coil substrate products deep processing of high value-added products. Such as electro-galvanized, hot dip galvanized, electro-galvanized fingerprint resistant, painted steel roll damping composite steel, PVC laminating steel plates, etc., so that the excellent quality of these products has a beautiful, high resistance to corrosion, has been widely used.

Cold rolled steel coil finishing after annealing, cut the head, tail, trimming, flattening, smooth, heavy volume, or longitudinal clipboard. Cold-rolled products are widely used in automobile manufacturing, household electrical appliances, instruments, switches, buildings, office furniture and other industries. Steel plate strapping package weight of 3 to 5 tons. Flat sub-volume typically 3 to 10 tons / volume. Coil diameter 6m.

Cold drawn steel tube is with hot-rolled steel coil as raw material, and tandem cold rolling pickled to remove oxide scale, its finished rolling hard roll, rolling hard volumes due to the continuous cold deformation caused by cold hardening strength, hardness increased indicators declined tough plastic, stamping performance will deteriorate, which can only be used for simple deformation of the parts.

Hot rolled seamless steel pipe deformed process

Hot-rolled seamless steel pipe production base deformation process can be summarized as three stages: perforation, extension and finishing.

round tube → heating → perforation → → three-roll rolling, rolling or extrusion → detached → sizing (or reducing) → cooling → straightening hydraulic test (orflaw) → tag → storage.

Billet is fed into the heating furnace, the temperature is about 1200 degrees Celsius. Fuel for a hydrogen or acetylene. The furnace temperature control is critical to wear air tube round, after the release of pressure puncher. which are generally more common puncher tapered roller punch this punch, high production efficiency, product quality, perforated expanding volume, wearing a variety of steels. After perforation, round tube has been three-roll cross rolling, rolling or extrusion.

After extrusion off pipe sizing. Sizing mill by the high-speed rotation of the cone drill into the Billet punch to form a steel pipe. The steel pipe inner diameter is determined by the length of the outer diameter of the sizing mill drill. After sizing, the steel pipe to enter the cooling tower by the water spray cooling, the steel pipe after cooling, it is necessary to be straightening. Sent by conveyor pipe by straightening the metal detection machine (or hydrostatic test) to conduct an internal flaw. Steel pipe internal issues such as cracks, bubbles will be detected.

Steel pipe quality inspection but also through a rigorous manual selection. Steel pipe of Quality Supervision, Inspection, use spray paint on the number, size, production batch. By a cable car hanging into the warehouse.

Welded Pipe Manufacturing Process

Welded Pipes are manufactured from Plate or continues Coil or strips. To manufacture welded pipe, first plate or coil is rolled in the circular section with the help of plate bending machine or by a roller in the case of continues process. Once the circular section is rolled from the plate, the pipe can be welded with or without filler material. Welded pipe can be manufactured in large size without any upper restriction. Welded pipe with filler material can be used in the manufacturing of long radius bends and elbow. Welded pipes are cheaper with compared to the seamless pipe and also Weak due to the weld
There are different welding methods used to weld the pipe.

1. ERW- Electric Resistance Welding
2. EFW- Electric Fusion Welding
3. HFW- High-frequency welding
4. SAW- Submerged Arc Welding (Long seam & Spiral Seam)

ERW Steel Pipe Manufacturing Process

In the ERW / EFW / HFW pipe process, first plate is formed in a cylindrical shape and the longitudinal edges of the cylinder formed are welded by flash-welding, low-frequency resistance-welding, high-frequency induction welding, or high-frequency resistance welding.

SAW Pipe Manufacturing Process
In SAW welding process, external filler metal (wire electrodes) are used to join the formed plates. SAW pipes can have a single longitudinal seam of double longitudinal seam depend on the size of the pipe. SAW pipe are also available in the spiral seam, which is continually rolled from the single plate coil. The production rate of spiral SAW pipe is very high as compared to Straight SAW pipe. However, Spiral SAW pipe are only used in low-pressure services such as water, non-critical process services etc.

Spiral SAW Pipe Welding

Chemical Composition and Mechanical Properties 

This data is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

Standard	Grade	Chemical Composition (%)					Mechanical Properties
ASTM A53		C	Si	Mn	P	S	Tensile STrength(Mpa)	Yield STrength(Mpa)
	A	≤0.25	–	≤0.95	≤0.05	≤0.06	≥330	≥205
	B	≤0.30	–	≤1.2	≤0.05	≤0.06	≥415	≥240
ASTM A106	A	≤0.30	≥0.10	0.29-1.06	≤0.035	≤0.035	≥415	≥240
	B	≤0.35	≥0.10	0.29-1.06	≤0.035	≤0.035	≥485	≥275
ASTM A179	A179	0.06-0.18	–	0.27-0.63	≤0.035	≤0.035	≥325	≥180
ASTM A192	A192	0.06-0.18	≤0.25	0.27-0.63	≤0.035	≤0.035	≥325	≥180
API 5L PSL1	A	0.22	–	0.90	0.030	0.030	≥331	≥207
	B	0.28	–	1.20	0.030	0.030	≥414	≥241
	X42	0.28	–	1.30	0.030	0.030	≥414	≥290
	X46	0.28	–	1.40	0.030	0.030	≥434	≥317
	X52	0.28	–	1.40	0.030	0.030	≥455	≥359
	X56	0.28	–	1.40	0.030	0.030	≥490	≥386
	X60	0.28	–	1.40	0.030	0.030	≥517	≥448
	X65	0.28	–	1.40	0.030	0.030	≥531	≥448
	X70	0.28	–	1.40	0.030	0.030	≥565	≥483
API 5L PSL2	B	0.24	–	1.20	0.025	0.015	≥414	≥241
	X42	0.24	–	1.30	0.025	0.015	≥414	≥290
	X46	0.24	–	1.40	0.025	0.015	≥434	≥317
	X52	0.24	–	1.40	0.025	0.015	≥455	≥359
	X56	0.24	–	1.40	0.025	0.015	≥490	≥386
	X60	0.24	–	1.40	0.025	0.015	≥517	≥414
	X65	0.24	–	1.40	0.025	0.015	≥531	≥448
	X70	0.24	–	1.40	0.025	0.015	≥565	≥483
	X80	0.24	–	1.40	0.025	0.015	≥621	≥552

Standard

Grade

Chemical Composition

Mechanical Properties

C

Si

Mn

P

S

Cr

Ni

Cu

Tensile Strength(Mpa)

Yield Strength(Mpa)

Elongation(%)

GB/T8163

10

0.07-0.14

0.17-0.37

0.35-0.65

≤0.035

≤0.035

≤0.15

≤0.25

≤0.25

335-457

≥205

≥24

20

0.17-0.24

0.17-0.37

0.35-0.65

≤0.035

≤0.035

≤0.25

≤0.25

≤0.25

410-550

≥245

≥20

Q345

0.12-0.20

0.20-0.55

1.20-1.60

≤0.045

≤0.045

–

–

–

490-665

≥325

≥21

Tolerance 

Pipe types	Pipe Szie(mm)		Tolerances
Hot rolled	OD	All	±1% (min ±0.50mm)
	WT	All	+15%, -12.5%
Cold drawn	OD	6～10	±0.20mm
		10～30	±0.40mm
		30～50	±0.45mm
		>50	±1%
	WT	≤1	±0.15mm
		>1～3	+15% -10%
		>3	+12.5% -10%

Pipe End 

Plain End	Wall Thickness less than 0.5 inch, including SCH STD & SCH XS
Plain End (Square Cut)	Wall Thickness over 0.5 inch, including SCH XXS
Beveled End	Wall Thickness less than 0.5 inch, including SCH STD & SCH XS
Couplings	Outside Diameter equal or less than 2”
Thread Protection	Outside Diameter over 4 inch