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Iran Seamless steel pipe

Seamless steel pipes are manufactured by piercing a solid round billet, resulting in a pipe with no weld seam on the surface. Based on the manufacturing process, seamless steel pipes can be classified into hot-rolled seamless pipes, cold-rolled seamless pipes, cold-drawn seamless pipes, extruded seamless pipes, and push-fit pipes, among others. According to the cross-sectional shape, seamless steel pipes are divided into round pipes and special-shaped pipes. Special-shaped pipes include square pipes, elliptical pipes, triangular pipes, hexagonal pipes, melon-seed-shaped pipes, star-shaped pipes, and finned pipes. The largest diameter is 900 mm, while the smallest is 4 mm. Depending on their application, seamless steel pipes are further categorized as thick-walled or thin-walled. Typically, seamless pipes can withstand 20% higher working pressure than welded pipes of the same material grade and size.

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IranSeamless steel pipe

Seamless Steel Pipe Description

Seamless steel pipes are manufactured by piercing a solid round billet, resulting in a pipe with no weld seam on its surface. Based on the manufacturing process, seamless steel pipes can be classified into hot-rolled seamless pipes, cold-rolled seamless pipes, cold-drawn seamless pipes, extruded seamless pipes, and push-fit pipes, among others. According to the cross-sectional shape, seamless steel pipes are divided into round pipes and special-shaped pipes. Special-shaped pipes include square pipes, elliptical pipes, triangular pipes, hexagonal pipes, melon-seed-shaped pipes, star-shaped pipes, and finned pipes. The largest diameter is 900 mm, while the smallest is 4 mm. Depending on their application, seamless steel pipes are further categorized as thick-walled or thin-walled. Generally, seamless pipes can withstand 20% higher working pressure than welded pipes of the same material grade and size.

Types of seamless steel pipes produced at our factory

Type	Uses
Structural Purpose	Overall Structure and Mechanics
Liquid Services	Oil, natural gas, and other fluid transportation
Low pressure and medium pressure	Steam and Boiler Manufacturing
Hydraulic Support Services	Hydraulic support
Automotive half-shaft housing	Automotive half-shaft sleeve
Pipeline pipe	Oil and Gas Transportation
Tubing and Casing	Oil and Gas Transportation
Drill pipe	Drilling
Geological drilling pipe	Geological drilling
Petroleum cracking tube	Furnace tubes, heat exchangers

Standards and Applications

Standard	Level	Uses
API	API 5L	Pipeline pipes for pipeline transportation systems
	API 5CT	Oil well tubing and casing
	API 5DP	Drilling drill pipe
ASTM	ASTM A53	Used as structural steel or low-pressure piping
	ASTM A106	Seamless Carbon Steel Pipe for High-Temperature Applications
	ASTM A335	Seamless Ferritic Alloy Steel Pipes for High-Temperature Service
	ASTM A213	For seamless ferritic and austenitic alloy steel boiler, superheater, and heat-exchanger tubes
	ASTM A179	For seamless cold-drawn low-carbon steel heat exchanger and condenser tubes
	ASTM A192	Seamless Carbon Steel Boiler Tubes for High-Pressure Applications
	ASTM A210	For seamless medium-carbon steel boiler and superheater tubes
	ASTM A333	Seamless steel tubes for cryogenic service and other applications requiring notch toughness
	ASTM A519	Suitable for seamless carbon steel and alloy steel mechanical tubing
	ASTM A252	Suitable for seamless and welded steel pipe piles
DIN	DIN 17175	For heat-resistant seamless steel pipes
	DIN 1629	Seamless round tubes of non-alloy steel for applications with special quality requirements
	DIN 2391	For cold-drawn or cold-rolled precision seamless steel tubes
JIS	Japanese Industrial Standard G3454	Seamless Carbon Steel Pipes for Pressure Vessels
	Japanese Standard G3456	Seamless Carbon Steel Pipe for High-Temperature Applications
	Japanese Industrial Standard G3461	Seamless Carbon Steel Pipes for Boilers and Heat Exchangers
EN	EN 10210	Seamless structural hollow sections for hot working of non-alloy steels
EN	EN 10216	Seamless steel pipes for pressure service
BS	BS 3059	Suitable for carbon steel, alloy steel, and austenitic stainless steel pipes with specific high-temperature performance.

Dimensional Tolerances for Seamless Steel Pipes

Pipeline Type	Pipe Size (mm)		Tolerance
Hot rolling	OD	<50	±0.50 mm
	OD	≥50	±1%
	WT	<4	±12.5%
		≥4–20	+15%, -12.5%
		>20	±12.5%
Cold drawing	OD	6 to 10	±0.20 mm
		10–30	±0.40 mm
		30–50	±0.45
		>50	±1%
	WT	<1	0.15mm
		>1–3	+15%, -10%
		>3	+12.5%, -10%

Structural tubing

Dimensions: Outer diameter: 1-1/4"–16", wall thickness: 0.109"–0.562"

Standards: ASTM A53, ASTM A106, ASTM A500/501-98, ASTM A519-98, JIS G3441-1994, JIS G3444-1994, BS EN 10210-1

Applications: Used in general structures and mechanisms, including construction, machinery, and transportation.

Boiler Piping

Dimensions: Outer diameter: 6.0 mm–114.0 mm, wall thickness: 1.0 mm–15.0 mm

Standards: GB3087-1999, ASTM A179, ASTM A106, JIS G3454

Applications: Used in the manufacture of superheater tubes, steam pipes, boiler water tubes, flue tubes, and small flue tubes, among others.

Seamless Steel Pipes for Liquid Services

Dimensions: Outer diameter: 19.05–168.3 mm, wall thickness: 2.31–14.27 mm

Standards: GB/T 8163-1999, ASTM A53-98, JIS G3452-1998, JIS G3454-1998, ASTM A106, DIN 1629-1984

Application: Used for the transportation of oil, natural gas, and other fluids.

Pipeline piping

Dimensions: Outer diameter: 73–630 mm, Wall thickness: 6–35 mm

Standard: API 5L

Applications: Gas and water transportation in the oil and gas industry

Drill pipe

Dimensions: Outer diameter: 2-7/8"–6-5/8", wall thickness: up to 0.813".

Standard: API 5D

Purpose: For drilling wells

Petroleum cracking tube

Dimensions: Outer diameter: 1.315"–20", wall thickness: 0.133"–0.500"

Standard: GB9948-1988

Application: Used in the manufacture of furnace tubes, heat exchangers, and pipelines for refineries.

Chemical Composition and Mechanical Properties

Standard

Level

Chemical Composition (%)

Mechanical Properties

Carbon

Silicon

Manganese

Phosphorus

Sulfur

Molybdenum

Chromium

Vanadium

Tensile Strength (MPa)

Yield Strength (MPa)

Elongation
(%)

ASTM A53

≤0.25

≤0.95

≤0.05

≤0.06

≤0.15

≤0.40

≤0.08

≥330

≥205

≥29.5

≤0.30

≤1.2

≤0.05

≤0.06

≤0.15

≤0.40

≤0.08

≥415

≥240

≥29.5

Standard

Level

Chemical Composition (%)

Mechanical Properties

Carbon

Silicon

Manganese

Phosphorus

Sulfur

Molybdenum

Chromium

Vanadium

Tensile strength
(MPa)

Yield strength
(MPa)

Elongation (%)

ASTM A106

≤0.30

≥0.10

0.29–1.06

≤0.035

≤0.15

≤0.40

≤0.08

≥415

≥240

≥30

≤0.35

≥0.10

0.29–1.06

≤0.035

≤0.15

≤0.40

≤0.08

≥485

≥275

≥30

Standard	Level	Chemical Composition (%)					Mechanical Properties
		Carbon	Silicon	Manganese	Phosphorus	Sulfur	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)
ASTM A179	A179	0.06-0.18	/	0.27–0.63	≤0.035	≤0.035	≥325	≥180	≥35

Standard	Level	Chemical Composition (%)					Mechanical Properties
Standard	Level	Carbon	Silicon	Manganese	Phosphorus	Sulfur	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)
ASTM A192	A192	0.06-0.18	≤0.25	0.27–0.63	≤0.035	≤0.035	≥325	≥180	≥35

Standard	Level	Chemical composition				Tensile Strength (Minimum)	Yield Strength (Minimum)
Standard	Level	Carbon	Manganese	Phosphorus	Sulfur	megapascal	megapascal
API 5LPSL1	A	0.22	0.9	0.03	0.03	331	207
	B	0.28	1.2	0.03	0.03	414	241
	X42	0.28	1.3	0.03	0.03	414	290
	X46	0.28	1.4	0.03	0.03	434	317
	X52	0.28	1.4	0.03	0.03	455	359
	X56	0.28	1.4	0.03	0.03	490	386
	X60	0.28	1.4	0.03	0.03	517	414
	X65	0.28	1.4	0.03	0.03	531	448
	X70	0.28	1.4	0.03	0.03	565	483

Standard	Level	Chemical composition				Tensile Strength (Minimum)	Yield Strength (Minimum)
Standard	Level	Carbon	Manganese	Phosphorus	Sulfur	megapascal	megapascal
API 5L PSL2	B	0.24	1.2	0.025	0.015	414	241
	X42	0.24	1.3	0.025	0.015	414	290
	X46	0.24	1.4	0.025	0.015	434	317
	X52	0.24	1.4	0.025	0.015	455	359
	X56	0.24	1.4	0.025	0.015	490	386
	X60	0.24	1.4	0.025	0.015	517	414
	X65	0.24	1.4	0.025	0.015	531	448
	X70	0.24	1.4	0.025	0.015	565	483
	X80	0.24	1.4	0.025	0.015	621	552