Name: Heavy Duty Seamless Carbon Steel Pipe for Structural and Pipeline Applications
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Home / Products / Steel Pipe & Tube / Carbon Steel Pipe / Heavy Duty Seamless Carbon Steel Pipe for Structural and Pipeline Applications

Heavy Duty Seamless Carbon Steel Pipe for Structural and Pipeline Applications

High-quality carbon steel pipes designed for reliable fluid transmission and structural applications. Featuring exceptional tensile strength, pressure resistance, and superior machinability, they are widely utilized across petroleum, chemical processing, municipal piping, and heavy machinery manufacturing worldwide.

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01 / PRODUCT OVERVIEW & KEY PARAMETERS

Item / Parameter	Specification
Product Name	Carbon Steel Pipe / Tube (Seamless & Welded)
Manufacturing Types	Seamless (SMLS) Hot Rolled / Cold Drawn, ERW, LSAW, SSAW
Outer Diameter (OD)	1/8" to 48" (10.3 mm – 1219.2 mm)
Wall Thickness (WT)	SCH 10 to SCH 160, STD, XS, XXS (1.24 mm – 59.54 mm)
Primary Steel Grades	ASTM A106 Gr. B, ASTM A53 Gr. B, API 5L (Gr. B, X42 to X70), ASTM A333 Gr. 6
Length Options	Single Random (5.8m–6.0m), Double Random (11.8m–12.0m), Custom Cut Lengths
End Preparation	Plain End (Square Cut), Beveled End (30°–35°), Threaded & Coupled, Grooved
Surface Treatment	Bare / Oiled, Black Varnish, Hot-Dip Galvanized (HDG), 3LPE, 3LPP, FBE

02 / CHEMICAL COMPOSITION & MECHANICAL PROPERTIES

? Chemical Composition (%)

Grade / Standard	Carbon (C) max	Manganese (Mn)	Phosphorus (P) max	Sulfur (S) max	Silicon (Si) min
ASTM A106 Gr. B	0.30%	0.29 – 1.06%	0.035%	0.035%	0.10%
ASTM A53 Gr. B	0.30%	1.20%	0.050%	0.045%	—
API 5L Gr. B (PSL1)	0.28%	1.20%	0.030%	0.030%	—
API 5L X52 (PSL2)	0.22%	1.40%	0.025%	0.015%	0.45% (max)

⚙️ Mechanical Properties

Grade / Standard	Yield Strength (min)	Tensile Strength (min)	Elongation in 2" (min)
ASTM A106 Gr. B	≥ 240 MPa (35,000 psi)	≥ 415 MPa (60,000 psi)	≥ 30%
ASTM A53 Gr. B	≥ 240 MPa (35,000 psi)	≥ 415 MPa (60,000 psi)	≥ 30%
API 5L Gr. B	≥ 245 MPa (35,500 psi)	≥ 415 MPa (60,200 psi)	≥ 23%
API 5L X52	360 – 530 MPa (52,200 psi)	460 – 760 MPa (66,700 psi)	≥ 21%

03 / ENGINEERING ADVANTAGES & KEY FEATURES

⚡ High Pressure & Temperature Resistance	? Precision Beveling for Easy Onsite Welding
Premium fully-killed carbon steel billet with uniform wall thickness and dense microstructure, ensuring zero leakage under severe pressure and thermal cycling.	Standard ASME B16.25 compound beveling (30°–35° with root face) allows quick fit-up and minimizes joint preparation time during field fabrication.
?️ Superior Multi-Layer Anti-Corrosion	? 100% Traceability & Stenciling
Automated application of 3LPE, 3LPP, FBE, and heavy hot-dip galvanizing provides extended protection for underground, subsea, and corrosive environments.	Every single pipe length is clearly stenciled with Mill Brand, Heat Number, Grade, Size, and Test verification for seamless quality audits.

04 / 6-STAGE QUALITY CONTROL WORKFLOW

① RAW MATERIAL	② HOT ROLLING	③ HEAT TREATMENT	④ 100% NDT TEST	⑤ CNC MACHINING	⑥ PACKAGING
Spectrometric chemical analysis of round billets.	Continuous laser monitoring of OD/WT.	Normalizing & tempering for strength.	Hydrostatic test (50MPa) + UT / Eddy Current.	30° End Beveling & paint stenciling.	Hexagonal bundling & end caps fitting.

05 / PACKAGING, MARKING & EXPORT STANDARD

Packaging Category	Standard Handling & Protection
Bundling (≤ 5" OD)	Hexagonal seaworthy bundles secured with 6–8 high-tensile steel straps and 2 heavy-duty lifting slings for crane discharge.
Loose Loading (> 6" OD)	Bulk container/vessel loading with timber dunnage spacers and heavy-duty polyester lashing.
Pipe End Protection	Recessed or flat plastic end caps to shield bevels and prevent internal dirt/moisture contamination.

Standard Pipe Stencil Marking Format:

============================================================
[BRAND NAME] ASTM A106 GRADE B SMLS
OD 8" SCH 40 WT 8.18MM L=6000MM
HEAT NO.: 20261027-A HYDRO TEST 20 MPA PASS
MADE IN CHINA
============================================================

06 / FREQUENTLY ASKED QUESTIONS (FAQ)

Q1: What is the primary difference between ASTM A106 and ASTM A53 pipes?
A: ASTM A106 is exclusively for seamless steel pipe designed for high-temperature service (such as power plants and refineries). ASTM A53 covers both seamless and welded (ERW) pipe for general pressure piping, structural support, and low-to-medium temperature fluid conveyance.
Q2: Do you provide EN 10204 3.1 Mill Test Certificates (MTC)?
A: Yes. Every batch is dispatched with complete EN 10204 3.1 MTC containing actual chemical analysis, mechanical test results, hydrostatic test pressure, and NDT inspection records.
Q3: Can we appoint third-party inspection (TPI) prior to shipment?
A: Yes, we regularly coordinate with SGS, Bureau Veritas, DNV, TÜV Rheinland, and Intertek for pre-shipment dimensional, visual, and non-destructive quality audits.
Q4: What is your standard production lead time and MOQ?
A: Standard stock sizes can be dispatched within 7–10 days. Customized rolling runs generally require 15–25 days. Our minimum order quantity (MOQ) is 5 Metric Tons.

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