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Carbon Seamless Steel Pipe

Keywords: Seamless Pipe, Seamless Carbon Steel Pipe, Seamless Structural Pipe, Seamless Boiler Pipe, Heat Exchanger Tubes, Seamless Cold Drawn Tubes, Hot Finished Seamless Pipes

Size: 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

Usage: Used for Low Pressure Liquid Delivery, Such As Water, Gas, and Oil

Finish: No.1 Pickled Finish, BA Finish, No.4 Finish, Electropolished Seamless Steel Pipes

Delivery: Within 30 days and Depends on your order quantity

Packing: Bundled/In Bulk, Plastic Caps Plugged, Waterproof Paper Wrapped

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Specification
Standard
Process
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FAQ

Seamless Steel Pipe Manufacturing Process

Mandrel Mill Process

In the Mandrel Mill Process, a solid round (billet) is used. It is heated in a rotary hearth heating furnace and then pierced by a piercer. The pierced billet or hollow shell is rolled by a mandrel mill to reduce the outside diameter and wall thickness which forms a multiple length mother tube. The mother tube is reheated and further reduced to specified dimensions by the stretch reducer. The tube is then cooled, cut, straightened and subjected to finishing and inspection processes before shipment.

Manner Man Plug Mill Process

In the Plug Mill Process, a solid round (billet) is used. It is uniformly heated in the rotary hearth heating furnace and then pierced by a Manner man pieces. The pierced billet or hollow shell is roll reduced in outside diameter and wall thickness. The rolled tube simultaneously burnished inside and outside by a reeling machine. The reeled tube is then sized by a sizing mill to the specified dimensions. From this step the tube goes through the straightener. This process completes the hot working of the tube. The tube (referred to as a mother tube) after finishing and inspection, becomes a finished product.

We are a professional Stainless Steel Pipe manufacturer. We provide Stainless Steel Pipe of different sizes as well as steel pipes and pipe fittings of various specifications.

Our Advantages:
1. China-leading product service provider and exporter of steel pipe
2. Competitive price and quality from our own factory
3. One-stop Resource Integration
4. Passed the ISO9001, CE, SGS certification every year
5. Best service with 24-hour response
6. Flexible payment methods
7. Strong production capacity
8. Fast delivery and standard export packaging
9. OEM/ODM

Features of Seamless Steel Pipe

Types	Uses
Structure Purposes	General structure and mechanical
Liquid Services	Petroleum, gas and other fluids conveying
Low and Medium Pressure	Steam and boiler manufacturing
Hydraulic Pillar Service	Hydraulic support
Auto Semi-shaft Casing	Auto seam-shaft casing
Line Pipe	Oil and gas conveying
Tubing and Casing	Oil and gas conveying
Drill Pipes	Well drilling
Geological Drilling Pipes	Geological drilling
Petroleum Cracking Tubes	Furnace tubes, heat exchange

Dimension

Pipe types	Pipe Szie(mm)		Tolerances
Hot rolled	OD	<50	±0.50mm
		≥50	±1%
	WT	<4	±12.5%
		≥4～20	+15%, -12.5%
		>20	±12.5%
Cold drawn	OD	6～10	±0.20mm
		10～30	±0.40mm
		30～50	±0.45
		>50	±1%
	WT	<1	±0.15mm
		>1～3	+ 15%, – 10%
		>3	+ 12.5%, – 10%

Chemical Composition Requirements

Standard

Grade

Chemical Components (%)

Mechanical Properties

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

Grade

Chemical Components(%)

Mechanical Properties

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	Grade	Chemical Components(%)					Mechanical Properties
		c	Si	Mn	P	S	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	Grade	Chemical Components(%)					Mechanical Properties
		c	Si	Mn	P	S	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

Manufacturing process of Seamless Steel Pipe

Painting & Coating: bare, lightly oiled, black/red/yellow painting, zinc/anti-corrosive coating

Standards & Specifications: Which standards do our Carbon Steel Pipes comply with?

Q: I need carbon steel pipes for a high-temperature application. Do you supply pipes according to ASTM or EN standards, and how do I choose the right grade?

A: Yes, we strictly manufacture and export pipes according to international standards.
For general structural use and pressure lines, we supply ASTM A53 Gr. B and ASTM A106 Gr. B.
For high-temperature services (boilers/refineries), ASTM A106 Gr. B/C or ASTM A335 (Alloy) is recommended, while API 5L is exclusively for oil and gas transmission lines.
For the European market, we comply with EN 10217 (welded) and EN 10216 (seamless) standards .
We always provide Mill Test Certificates (MTC) verifying the chemical composition and mechanical properties.

Export Licenses & Compliance: What is the "Export License" situation for 2025-2026?

Q: I heard China has new restrictions on steel exports. Can you ship Carbon Steel Pipes without issues in 2026?
A: As of January 1, 2026, China requires export licenses for specific steel products classified under HS Code Chapters 72 and 73 (7301-7307) .
We manage this for you: We handle the application for the Export License with the Ministry of Commerce, submitting the export contract and quality inspection certificates.
Dual-Use Items: For high-strength, corrosion-resistant alloy pipes used in specific industrial sectors, we ensure compliance with the "Dual-Use Item" permit requirements if applicable .

Minimum Order Quantity (MOQ) & Customization

Q: I only need a small batch of large-diameter pipes (20 ft) for a specific project. Do you accept small orders?
A: Yes. While standard sizes are stocked, we accept low MOQs for custom sizes. We support customized moulds for non-standard diameters and specific lengths (random or fixed) .