Seamless pipe is a hollow tubular steel without welding seams, which is made by perforated hot rolling, cold drawing or cold rolling process. It has the characteristics of uniform structure, high strength and good sealing. Its surface is usually the original color of metal (silver gray), and can be galvanized, painted, plated and other anti-corrosion treatments according to needs.

According to the production process, it is divided into:
√ Hot-rolled seamless pipe: thick wall thickness, large outer diameter range, suitable for high pressure and high strength scenes;

√ Cold rolled / cold drawn seamless pipe: high precision, smooth surface, uniform wall thickness, mostly used for precision machinery or fluid transportation.

According to the material, it is divided into:

Carbon steel seamless pipe (such as Q235, 20# steel): low cost and wide application;

Alloy steel seamless pipe (such as 15CrMo, 42CrMo): high temperature, high pressure and corrosion resistance;

Stainless steel seamless pipe (such as 304, 316L): excellent corrosion resistance, suitable for food, medical, chemical and other fields.

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Description

Basic Info.

Type: Seamless

Technique: Cold Drawn

Material: Carbon Steel

Surface Treatment: Oiled

Usage: Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose

Section Shape: Round

Name:Seamless Steel Pipe

Grade: Q195/Q235/Q345/S235jr/S275jr/S355jr

Standrad: ASTM JIS GB BS

Certificate: CE, ISO9001

MOQ: 3 Ton

Delivery Time: Within 7 Days

Price Term: CIF CFR FOB EXW

Transport Package: Sea Worth Packing

Origin: China, Shandong

HS Code: 7304399000

Production Capacity: 500000tons each year

Black Surface Seamless Carbon Steel Tube for Q195-Q345 Grade

Specification

ASTM A53/A53M Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
Pipe ordered under this specification is intended for mechanical and pressure applications and is also acceptable for ordinary uses in steam, water, gas, and air lines.

ASTM A106/A106M Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service
This specification 2 covers seamless carbon steel pipe for high-temperature service in NPS 1 ⁄ 8 to NPS 48 [DN 6 to DN 1200] inclusive, with nominal (average) wall thickness as given in ASME B 36.10M.

API SPECIFICATION 5L Specification for Line Pipe

This Standard specifies requirements for the manufacture of two product specification levels of seamless and welded steel pipes for use in pipeline transportation systems in the petroleum and natural gas industries.

Product	Item	ASTM A106 GR.B Black painted & marking seamless steel pipe
Size	OD	1/8” -24” (5.0mm-716mm)
	Wall Thickness	0.3mm-26mm SCH20,SCH40,STD,XS,SCH80,SCH160,XXS
	Length	Less than 12m
Steel material	ASTM 106 Gr.B, API 5L Gr.B , ASTM A 53 Gr.B
Standard	ASTM A53, BS1387-1985
Zinc Weight	120g,270g,400g,500g,550g 20μm ,40μm ,60μm,70μm,80μm
Usage	1)low pressure liquid, water, gas, oil, line pipe 2)construction 3)fence, door pipe
Ends	1) Plain 2) Beveled 3) Thread with Coupling or cap 4) Chamfer 5) Groove 6) Screw
End protector	1) Plastic pipe cap 2) Iron protector
Surface Treatment	1) Bared 2) Black Painted (varnish coating) 3) Galvanized 4) Oiled 5) PE,3PE, FBE, corrosion resistant coating, Anti corrosion coating.
Technique	Electronic Resistance Welded (ERW ) Electronic Fusion Welded (EFW) Double Submerged Arc Welded (DSAW)
Welded Line Type	Longitudinal

Here our hot selling sizes

Nominal Size (Inch)	Outer Diameter (mm)	SCH40 Thickness (mm)	SCH80 Thickness (mm)	SCH160 Thickness (mm)
1/4"	13.7	2.24	3.02
3/8"	17.1	2.31	3.2
1/2"	21.3	2.77	3.73	4.78
3/4"	26.7	2.87	3.91	5.56
1"	33.4	3.38	4.55	6.35
1-1/4"	42.2	3.56	4.85	6.35
1-1/2"	48.3	3.68	5.08	7.14
2"	60.3	3.91	5.54	8.74
2-1/2"	73	5.16	7.01	9.53
3"	88.9	5.49	7.62	11.13
3-1/2"	101.6	5.74	8.08
4"	114.3	6.02	8.56	13.49
5"	141.3	6.55	9.53	15.88
6"	168.3	7.11	10.97	18.26
8"	219.1	8.18	12.7	23.01
10"	273	9.27	15.09	28.58
12"	323.8	10.31	17.48	33.32
16	406.4	9.53	12.7	21.44
14	355.6	9.53	11.13	19.05

Implementation standards

National standard:
GB/T 8162 (for structure),
GB/T 8163 (for fluid transportation),
GB/T 3087 (for low and medium pressure boilers),
GB/T 5310 (for high pressure boilers);

American standard:
ASTM A106 (seamless steel pipe for high temperature),
ASTM A312 (stainless steel seamless pipe);
European standard:
EN 10216 (seamless steel pipe for pressure).

Applications

1. Industrial pipeline system

Fluid transportation: water, oil, gas (natural gas, steam) pipelines, such as municipal water supply, chemical raw material pipelines, thermal pipelines;

High-pressure scenarios: boiler pipelines (power station boilers, industrial boilers), hydraulic system pipelines (construction machinery, injection molding machines).

2. Machinery manufacturing

Structural support: automobile drive shafts, bicycle frames, oil drill pipes;

Precision parts: cylinder tubes, hydraulic cylinder barrels (high-precision cold-rolled seamless pipes are required).

3. Construction and Engineering

Steel structures: supporting columns of bridges and high-rise buildings (such as large-diameter hot-rolled seamless pipes);

Pile foundation engineering: steel pipes for piling, underground continuous wall pipes.

4. Chemical and Petroleum

Corrosive medium transportation: stainless steel seamless pipes are used to transport acid, alkali, and salt solutions;

Oil extraction: oil well pipes, casing (anti-sulfur and anti-corrosion alloy pipes are required).

5. Other fields

Shipbuilding: marine boiler pipes, seawater desalination pipes;

Medical equipment: stainless steel sterile pipes (pharmaceuticals, food processing);

Aerospace: aircraft engine oil pipes, hydraulic pipes (ultra-high strength alloy pipes are required).

Performance

1. Mechanical properties

High strength: seamless pipes have no welds, and the overall strength is higher than that of welded pipes, suitable for high pressure and impact loads;

Fatigue resistance: not easy to crack under cyclic loads, suitable for vibration environments (such as mechanical transmission pipes).

2. Corrosion resistance

Stainless steel material: 304/316L seamless pipes are resistant to acid, alkali and salt corrosion and are widely used in chemical and marine engineering;

Surface treatment: galvanizing (Zn), epoxy resin coating (EP), and polyethylene lining (PE) can further enhance the corrosion resistance.

3. Process performance

Weldability: Carbon steel and low alloy steel seamless pipes can be connected by welding, and stainless steel pipes require special welding materials;

Processability: Can be bent, expanded, reduced in diameter and other processing (cold-rolled pipes are easier to form).

4. Sealing

The weld-free design is suitable for scenarios with high sealing requirements (such as gas pipelines and hydraulic systems).

FAQ

1. Q: What is the difference between seamless pipes and welded pipes?

Structure: Seamless pipes have no welds, and welded pipes have longitudinal or spiral welds;

Strength: Seamless pipes have higher overall strength and are suitable for high-pressure scenarios (such as boilers and hydraulic systems);

Cost: The production process of seamless pipes is complex, and the price is 10%-30% higher than that of welded pipes.

2. Q: How to choose the material of seamless pipe?

General environment: choose Q235 or 20# carbon steel (low cost, easy to process);

Corrosive environment: choose 304/316L stainless steel or galvanized seamless pipe;

High temperature and high pressure: choose 15CrMo, 12Cr1MoV and other alloy pipes (specific temperature and pressure parameters must be provided).

3. Q: Can the size of seamless pipe be customized?

Regular specifications (outer diameter 6-630mm, wall thickness 0.5-50mm) can be customized in length (such as fixed length 6m, 9m);

Special caliber or wall thickness requires mold production, the minimum order quantity is higher (usually ≥5 tons), and the delivery time is extended by 2-4 weeks.

4. Q: How to detect the quality of seamless pipes?

Answer:

Appearance: no cracks, folds, or scars on the surface, and uniform wall thickness;

Non-destructive testing: ultrasonic (UT) and eddy current (ET) detection of internal defects;

Pressure test: water pressure test (such as water pressure 10MPa, pressure maintenance for 5 minutes without leakage).

5. Q: How to prevent rust during transportation of seamless pipes?

Answer:

Short-term transportation: can be naked in dry environment, and covered with waterproof cloth in humid environment;

Long-term storage: stored in a dry warehouse, ≥20cm from the ground, regularly check the surface rust, and re-oil if necessary.