Seamless Steel Pipes

Your Professional Seamless Steel Pipes Supplier

Hebei Senhai Pipeline Co., Ltd. is one professional manufacturer of ERW, SAW and SMLS steel pipes, as per standards of API5L, API 5CT, ASTM, EN, BS, DIN, GOST, GB, etc. Senhai Pipeline is located in Cangzhou City, which is the famous "Hometown of Pipes and Fittings" in China, about 120km away from Tianjin Seaport and Airport, and 180km from capital Beijing. Senhai especially produces welded steel pipes of large diameter and thick wall thickness in ERW, LSAW and SSAW. Anti-corrosion layers can also be done in our factory.

Why Choose Us

Sales Market
Senhai's products are popular in many countries and districts like Southeast Asia, Mid-East, Europe, America, Australia, South America, Africa, etc. "Customer's satisfaction, highly-qualified products and outstanding services" are treasured by Senhai as the business principle.

Our Certifications
Materials include A106 Gr.B, A53 Gr.B, API 5L PSL1 PSL2 X42~X70 L245 L290 L360, Q235A, Q235B, Q235C, Q345B~F, 10#, 20#, 45# steel, A105, WPB, etc., all of which meet the standards of ASTM, API, BS, DIN, JIS, EN, GOST, GB, etc. following standards including ISO9002,ASTM A234 GR WPB ASME/ANSI B16.9,DIN2605-1/2 2615 2617, JISB2311 2312, EN10253-1/2/3, GOST 17375 17376 17378 17379 GOST 30753, etc.

Production Equipment
The major production equipment owned by Senhai cover the hot-rolling puncher, interactive double core bar cold drawing machine, automatically rotary head rolling machine, tube straightening machine, annealing furnace without water cooling system and auxiliary equipment of surface scouring and coating.

Our Factory
Occupying total area of 33,000 square meters, Senhai possesses workshops of four hot rolling production lines, two cold drawing production lines, four welded pipe production lines and office building. The major production equipment owned by Senhai cover the hot-rolling puncher, interactive double core bar cold drawing machine, automatically rotary head rolling machine, tube straightening machine, annealing furnace without water cooling system and auxiliary equipment of surface scouring and coating.

Specification

OMINAL PIPE SIZE	OD(mm)	NOMINAL WALL THICKNESS
DN	NB(inch)	ASME	SCH10	SCH20	SCH30	STD	SCH40	SCH60	XS	SCH80	SCH100	SCH120	SCH140	SCH160	XXS
15	1/2"	21.3	2.11		2.41	2.77	2.77		3.73	3.73				4.78	7.47
15	1/2"	21.3	2.11		2.41	2.77	2.77		3.73	3.73				4.78	7.47
20	3/4"	26.7	2.11		2.41	2.87	2.87		3.91	3.91				5.56	7.82
25	1"	33.4	2.77		2.9	3.38	3.38		4.55	4.55				6.35	9.09
32	1.1/4"	42.2	2.77		2.97	3.56	3.56		4.85	4.85				6.35	9.7
40	1.1/2"	48.3	2.77		3.18	3.68	3.68		5.08	5.08				7.14	10.15
50	2"	60.3	2.77		3.18	3.91	3.91		5.54	5.54				8.74	11.07
65	2.1/2"	73	3.05		4.78	5.16	5.16		7.01	7.01				9.53	14.02
80	3"	88.9	3.05		4.78	5.49	5.49		7.62	7.62				11.13	15.25
90	3.1/2"	101.6	3.05		4.78	5.74	5.74		8.08	8.08
100	4"	114.3	3.05		4.78	6.02	6.02		8.56	8.56		11.13		13.49	17.12
125	5"	141.3	3.4			6.55	6.55		9.53	9.53		12.7		15.88	19.05
150	6"	168.3	3.4			7.11	7.11		10.97	10.97		14.27		18.26	21.95
200	8"	219.1	3.76	6.35	7.04	8.18	8.18	10.31	12.7	12.7	15.09	18.26	20.62	23.01	22.23
250	10"	273	4.19	6.35	7.8	9.27	9.27	12.7	12.7	15.09	18.26	21.44	25.4	28.58	25.4
300	12"	323.8	4.57	6.35	8.38	9.53	10.31	14.27	12.7	17.48	21.44	25.4	28.58	33.32	25.4
350	14"	355.6	6.35	7.92	9.53	9.53	11.13	15.09	12.7	19.05	23.83	27.79	31.75	35.71
400	16"	406.4	6.35	7.92	9.53	9.53	12.7	16.66	12.7	21.44	26.19	30.96	36.53	40.19
450	18"	457.2	6.35	7.92	11.13	9.53	14.27	19.05	12.7	23.83	39.36	34.93	39.67	45.24
500	20"	508	6.35	9.53	12.7	9.53	15.09	20.62	12.7	26.19	32.54	38.1	44.45	50.01
550	22"	558.8	6.35	9.53	12.7	9.53		22.23	12.7	28.58	34.93	41.28	47.63	53.98
600	24"	609.6	6.35	9.53	14.27	9.53	17.48	24.61	12.7	30.96	38.89	46.02	52.37	59.54
650	26"	660.4	7.92	12.7		9.53			12.7
700	28"	711.2	7.92	12.7	15.88	9.53			12.7
750	30"	762	7.92	12.7	15.88	9.53			12.7
800	32"	812.8	7.92	12.7	15.88	9.53	17.48		12.7
850	34"	863.6	7.92	12.7	15.88	9.53	17.48		12.7
900	36"	914.4	7.92	12.7	15.88	9.53	19.05		12.7

Standards

Standards	Grades	Class
API	API 5L	Line pipe for pipeline transportation systems
	API 5CT	Tubing and casing for wells
	API 5DP	Drill Pipe for well drilling
ASTM	ASTM A53	Used as structural steel or for low-pressure plumbing
	ASTM A106	Seamless carbon steel pipe for high-temperature service
	ASTM A335	For seamless ferritic alloy-steel pipe 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	For seamless carbon steel boiler tubes for high-pressure service
	ASTM A210	For seamless medium-carbon steel boiler and superheater tubes
	ASTM A333	For seamless steel pipe for low-temperature service and other applications with required notch toughness
	ASTM A519	For seamless carbon and alloy steel mechanical tubing
	ASTM A252	For seamless and welded steel pipe piles
DIN	DIN 17175	For heat resistant seamless steel pipe lines
	DIN 1629	For seamless circular tubes of non alloys steels wth special quality requirements
	DIN 2391	For cold drawn or cold rolled precision seamless steel tubes
JIS	JIS G3454	Seamless carbon steel pipe for pressure service
	JIS G3456	Seamless carbon steel pipe for high temperature service
	JIS G3461	Seamless carbon steel pipe for boiler and heat exchanger
EN	EN 10210	For hot finished seamless structural hollow sections of non-alloy steels
EN	EN 10216	Seamless steel tubes for pressure purposes
BS	BS 3059	For carbon,alloy and austenitic stainless steel tubes with specified elevated temperature properties

Size

Nominal size [inches]	Outside diameter [inches]	Outside diameter [mm]	Wall thickness [inches]	Wall thickness [mm]	Weight [lb/ft]	Weight [kg/m]
1/8	0.405	10.3	0.068	1.73	0.24	0.37
1/4	0.54	13.7	0.088	2.24	0.42	0.84
1/2	0.84	21.3	0.109	2.77	0.85	1.27
3/4	1.05	26.7	0.113	2.87	1.13	1.69
1	1.315	33.4	0.133	3.38	1.68	2.5
1.25	1.66	42.2	0.14	3.56	2.27	3.39
1.5	1.9	48.3	0.145	3.68	2.72	4.05
2	2.375	60.3	0.154	3.91	3.65	5.44
2.5	2.875	73	0.203	5.16	5.79	8.63
3	3.500	88.9	0.216	5.49	7.58	11.29
3.5	4.000	101.6	0.226	5.74	9.11	13.57
4	4.500	114.3	0.237	6.02	10.79	16.07
5	5.563	141.3	0.258	6.55	14.62	21.77
6	6.625	168.3	0.28	7.11	18.97	28.26
8	8.625	219.1	0.322	8.18	28.55	42.55
10	10.75	273	0.365	9.27	40.48	60.31
12	12.75	323.8	0.406	10.31	53.52	79.73
14	14	355.6	0.375	11.13	54.57	94.55
16	16	406.4	0.5	12.7	82.77	123.3
18	18	457	0.562	14.27	104.67	155.8
20	20	508	0.594	15.09	123.11	183.42
24	24	610	0.688	17.48	171.29	255.41
32	32	813	0.688	17.48	230.08	342.91

Advantages of Seamless Steel Pipes

High strength and rigidity
Seamless steel tubes have high strength and rigidity, so they can withstand a lot of pressure and bending forces. This property makes seamless steel tube an important material for structures such as bridges, buildings and vehicles.

High temperature resistance
Seamless steel tube has good high temperature resistance and can maintain stable performance at high temperatures. Therefore, it can be used in various high-temperature applications, such as steam pipes, heat exchangers and stoves.

Corrosion resistance

Seamless steel tubes have a smooth surface and no seams, so they have good corrosion resistance. It can be used in the transportation and storage of various chemicals, as well as in marine engineering and other fields.

Precision processing

Seamless steel tubes have smooth inner and outer surfaces, small errors, and high dimensional stability. They are suitable for engineering fields that require high precision, such as aviation, aerospace, and nuclear industries.

Cost-effectiveness

The production cost of seamless tubes is relatively low, so in some occasions that require large amounts of use, the use of seamless tubes can reduce costs. In addition, due to its corrosion resistance and high temperature resistance, seamless tubes have a long service life, further reducing costs.

Key Application Areas of a Seamless Steel Pipes

Oil and gas industry
Seamless steel pipes are extensively used in the oil and gas industry for transporting fluids and gases under high pressure and temperature. These pipes are ideal for drilling, exploration, and production activities as they can withstand harsh environmental conditions and extreme temperatures. They are also used in the construction of oil rigs, refineries, and pipelines.

Automotive industry
Seamless steel pipes are used in the automotive industry for manufacturing various components such as exhaust systems, shock absorbers, and hydraulic cylinders. These pipes are preferred over other types of pipes as they offer high strength, durability, and resistance to corrosion and wear.

Construction industry
Seamless steel pipes are widely used in the construction industry for various applications such as structural support, scaffolding, and building frameworks. These pipes are preferred over other types of pipes as they offer high strength, durability, and resistance to corrosion and wear.

Aerospace industry
Seamless steel pipes are extensively used in the aerospace industry for manufacturing various components such as aircraft engines, landing gear, and hydraulic systems. These pipes are preferred over other types of pipes as they offer high strength, durability, and resistance to corrosion and wear.

Power generation industry
Seamless steel pipes are used in the power generation industry for manufacturing various components such as boilers, heat exchangers, and turbines. These pipes are preferred over other types of pipes as they offer high strength, durability, and resistance to corrosion and wear.

Chemical industry
Seamless steel pipes are used in the chemical industry for transporting various chemicals and fluids under high pressure and temperature. These pipes are preferred over other types of pipes as they offer high strength, durability, and resistance to corrosion and wear.

Mining industry
Seamless steel pipes are extensively used in the mining industry for transporting various minerals and ores. These pipes are preferred over other types of pipes as they offer high strength, durability, and resistance to corrosion and wear.

Unique Properties of Seamless Steel Pipes

Tensile strength
During the tensile process, the maximum force that the sample bears when it is broken is the stress obtained from the original cross-sectional area of the sample, which is called tensile strength, and the unit is N/mm2. It represents the maximum ability of a metal material to resist damage under tension. The calculation formula is:
● In the formula: Fb--the maximum force that the sample bears when it is pulled off, N; So--the original cross-sectional area of the sample, mm2.

Yield point
For metal materials with yielding phenomenon, the stress at which the specimen can continue to elongate without increasing the force during the stretching process is called the yield point. If the force decreases, the upper and lower yield points should be distinguished. The unit of yield point is N/mm2.
The formula for calculating yield point is:
● In the formula: Fs--yield force of the sample during tensile process, NSo--the original cross-sectional area of the sample, mm2.

Elongation after fracture
In a tensile test, the percentage of the increase in the gauge length of the specimen after it is broken is called the elongation. It is represented by σ and the unit is %. The calculation formula is:
● In the formula: L1--the gauge length of the specimen after breaking, mm; L0--the original gauge length of the specimen, mm.

Section shrinkage
In the tensile test, the percentage of the maximum reduction of the cross-sectional area at the reduced diameter of the specimen after the specimen is broken is called the reduction of the area. It is expressed in ψ and the unit is %. Calculated as follows:
● In the formula: S0--the original cross-sectional area of the sample, mm2; S1--the minimum cross-sectional area at the reduced diameter after the sample is broken, mm2.

Hardness index
The ability of a metal material to resist the indentation of a hard object is called hardness. According to different test methods and scope of application, hardness can be divided into Brinell hardness, Rockwell hardness, Vickers hardness, Shore hardness, microhardness and high temperature hardness. For pipes, there are three commonly used hardnesses: Brinell, Rockwell and Vickers.

Types of Seamless Steel Pipes

Hot rolled seamless steel pipe
Hot-rolled seamless steel pipe is a seamless steel pipe made by heating the blank to a sufficient temperature through a hot-rolling process, and then passing it through multiple continuous passes. Its advantages are high production efficiency and smooth surface. It is usually used to transport high-temperature and high-pressure gas or liquid.

Cold drawn seamless steel pipe
Cold drawn seamless steel pipe is processed from steel pipe blank into seamless steel pipe through cold drawing process. Compared with hot-rolled seamless steel pipes, cold-drawn seamless steel pipes have higher surface smoothness and higher dimensional accuracy, and are suitable for manufacturing various precision mechanical parts and refrigeration equipment.

Precision seamless steel pipe
Precision seamless steel pipes are produced through cold drawing processes, which require higher dimensional accuracy and surface smoothness. They are used to manufacture high-precision equipment such as hydraulic systems, aerospace vehicles, and nuclear power plants.

Alloy seamless steel pipe
Alloy seamless steel pipe is a steel pipe with high temperature, high pressure, high strength and high corrosion resistance. It is widely used in petrochemical, electric power, nuclear industry and other fields. According to their alloy composition, they can be divided into different types, such as chromium-molybdenum alloy steel pipes, nickel alloy steel pipes, etc.

Stainless steel seamless steel pipe
Stainless steel seamless pipe is a steel pipe with strong corrosion resistance and is widely used in petrochemical, pharmaceutical, food and other fields. According to their different compositions and uses, stainless steel seamless steel pipes can be divided into different varieties, such as austenitic stainless steel pipes, ferritic stainless steel pipes, etc.

Our Certificate

FAQ

Q: What is the limit of seamless pipe?

A: When manufacturing seamless pipes, the length manufactured depends on the weight per metre or per rod. Thus up to NB 100, pipe lengths of a maximum 13 m, and up to NB 200 pipe lengths of a maximum of around 4 m can be produced.

Q: What are the manufacturing tolerances for seamless pipe?

A: The wall thickness tolerance of 12.5 % for hot rolled seamless pipes is specified fundamentally in ASTM A999 or EN ISO 1127 T2. However, wall thickness differences caused by the manufacturing procedure may lead to a possible eccentricity, that is, to a deviation from symmetry (Diagram 2).

Q: What is the en standard for seamless pipe?

A: The En 10216-5 Tc1 Seamless Pipe is made up of cold drawing and hot rolling procedures. The pipes can range in dimensions variously for various applications. The lengths can range up to 12000mm and longer depending on the application requirements.

Q: What is the maximum thickness of seamless pipe?

A: The maximum specification of hot-expanded seamless steel pipes is 325mm-1220mm and the thickest is 200mm.

Q: Is seamless pipe stronger than welded?

A: Furthermore, the pressure capacity of seamless pipes is higher than welded ones, and the surface is much smoother, with the chances of corrosion being reduced. A combination of all these factors makes the product an effective, yet costlier option in comparison to the welded pipe.

Q: What is the absolute roughness of seamless pipe?

A: The FRP used in the oilfield has absolute roughness of 0.0053mm, while absolute roughness of new seamless steel pipe or galvanized iron pipe is 0.1~0.2mm.

Q: What grade is seamless pipe?

A: MS Seamless Pipe is made from different grades of steel, each with its own unique properties. Some of the common grades of MS seamless pipe are – ASTM A106 Grade B, ASTM A333 Grade 6, and API 5L Grade B. These grades differ in terms of their tensile strength, yield strength, and chemical composition.

Q: What is the steel code for seamless pipe?

A: a) 7304.11: Seamless pipes and tubes of iron or non-alloy steel with an external diameter not exceeding 168.3 mm. b) 7304.19: Seamless pipes and tubes of iron or non-alloy steel with an external diameter exceeding 168.3 mm. c) 7304.22: Seamless pipes and tubes of stainless steel.

Q: Is Schedule 40 steel pipe seamless?

A: Sch 40 can be used for both seamless steel pipes and ERW (Electric Resistance Welded) pipes. NPS OD Schedule # Wall Thickness ID.

Q: What is the difference between ERW and seamless steel pipe?

A: Seamless pipe is manufactured by extruding the metal to the desired length; therefore ERW pipe have a welded joint in its cross-section, while seamless pipe does not have any joint in its cross-section through-out its length.

Q: What is the mill tolerance for seamless pipe?

A: Mill tolerances are provided in specifications. The most common tolerance on the wall thickness of straight pipe is 12.5%. This means that the wall thickness at any given location around the circumference of the pipe must not be less than 87.5% of the nominal wall thickness.

Q: What is the largest size of seamless pipe?

A: Seamless pipe is produced in sizes from 1/8 to 36" nominal.

Q: What is the hardness of seamless pipe?

A: Seamless pipe without quenching hardness less than HRC28, relatively soft, not wear-resistant; quenched hardness can be (note that it can be) greater than HRC55, wear resistance is better, but this is a small cross-section, the cross-section is slightly larger, the hardness obtained will be reduced.

Q: What is the joint efficiency of seamless pipe?

A: The Joint Efficiency Factor in seamless and radiographed fusion welds should be taken as equal to 1. From 1950 and later, such welds in wrought fittings were highly likely to have been radiographed.

Q: What is the ASME Code for seamless pipe?

A: ASME B36. 19 covers standard specifications for seamless and welded pipe grades that are designed to work in high as well as low pressure and temperature applications. The ASME B 36.19 can also be used for non-ferrous grade pipes such as titanium, zirconium, copper, and aluminum.

Q: What is seamless steel pipe used for?

A: Because seamless pipes are able to withstand high pressures, they are also widely used in high-pressure applications including refineries, hydraulic cylinders, hydrocarbon industries, and in Oil and Gas infrastructure (Pearlite Steel, 2017).

Q: What is the thickness tolerance for seamless pipe?

A: Tolerances on the wall Thickness The minimum wall thickness at any point shall not be more than 12.5 % under the specified wall thickness. Tolerances in Mass The mass of any length of pipe shall not vary more than 10 % over and 3.5 % under that specified.

Q: Is standard for seamless pipe?

A: Steel tubes produced under Indian standard 1239 is to be constructed either in a seamless or welded manner. Seamless carbon steel IS 1239 YST 240 has to be produced from tested quality steel, which in turn is to manufactured by any process that has been approved. This carbon steel grade is to be fully killed.

Q: What is the absolute roughness of seamless pipe?

A: The FRP used in the oilfield has absolute roughness of 0.0053mm, while absolute roughness of new seamless steel pipe or galvanized iron pipe is 0.1~0.2mm.

Q: What is the mill tolerance for seamless pipe?

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