Product Highlights

1. Multi‑international standard compliance: API 5L, ASTM A53, ASTM A106, ASTM SA179, SA192, SA210, SA213, SA335, ASTM A519, DIN 1629, EN 10216‑1, JIS G3454/G3455/G3456
2. Complete specification range: Outer diameter 10.3 mm‑1219.2 mm, wall thickness 1.65 mm‑60 mm; standard lengths 5.8 m / 6 m / 11.8 m /12 m, custom cut‑to‑length available
3. Two mature forming processes: hot‑rolled for large‑diameter heavy‑wall pipes; cold‑drawn for high‑precision small‑dimension tubes with excellent surface finish and tight tolerance
4. Abundant grade portfolio: carbon steel, low‑alloy Cr‑Mo heat‑resistant steel, mechanical tubing grades for fluid transmission, boiler, low‑temperature, mechanical‑structure and hydraulic applications
5. Multiple pipe‑end options: plain end, beveled end; plastic end caps for anti‑collision protection; black painting, anti‑rust oil, galvanized surface treatments are optional
6. Strict full‑item pre‑shipment inspection: hydrostatic test, ultrasonic inspection, tensile‑hardness mechanical test, spectral chemical verification, dimensional tolerance checking
7. Uniform batch management: each bundle from identical heat lot with clear heat number marking; MTC 3.1 mill test certificate can be supplied for export projects
8. Flexible order support: small‑quantity trial orders and large‑volume bulk projects acceptable; integrated cutting, machining and deep‑processing service per customer drawings

Product Overview

Thick‑wall seamless steel pipe is a hollow tubular product manufactured from solid steel billet by hot‑rolling or cold‑drawing without any welding seam. Without weld‑joint weakness, it delivers superior pressure‑bearing capacity compared with welded pipes, suitable for high‑pressure, high‑temperature, heavy‑load working conditions.

We supply hot‑rolled heavy‑wall seamless pipes for large‑diameter engineering pipelines and cold‑drawn precision thick‑wall tubes for hydraulic cylinders and mechanical blanks. Product grades cover general carbon steel for fluid conveyance, boiler‑special carbon steel, Cr‑Mo heat‑resistant alloy steel for high‑temperature service, low‑temperature grades for cryogenic environments and ASTM A519 mechanical tubing for component blanks.

All pipes can be further processed into finished parts via cutting, turning, boring and bending. Widely used for oil‑gas transmission, boiler power plants, hydraulic support, geological drilling, heat‑exchanger equipment and heavy‑duty structural projects worldwide.

Material Grade Characteristics

ASTM A53 Gr.A / Gr.B

General‑purpose carbon seamless steel pipe. Good weldability and moderate mechanical performance. Grade B is the most widely‑used grade for water, gas and general‑pressure fluid delivery systems.

ASTM A106 Gr.A / Gr.B

High‑temperature service carbon seamless pipe. Silicon‑added formulation for high‑temperature oxidation resistance, applied for high‑temperature fluid pipelines in power, petrochemical plants. Grade B has higher tensile & yield strength.

ASTM SA179

Cold‑drawn low‑carbon seamless tube, dedicated for heat exchangers and condensers. Fine surface quality, precise dimension for heat‑exchange equipment.

ASTM SA192

High‑pressure boiler carbon steel tube, stable performance under high‑pressure steam circulation for boiler heating‑surface components.

ASTM SA210

Medium‑carbon seamless boiler & superheater tube, good high‑temperature strength for power‑station boiler systems.

ASTM SA335 Series (P9, P11, P22, T91)

Cr‑Mo ferritic heat‑resistant alloy steel. Excellent high‑temperature creep‑resistance and oxidation‑resistance for high‑temperature power‑plant and petrochemical process pipelines.

ASTM A333 Gr.6

Low‑temperature service carbon/alloy seamless pipe, optimized impact toughness for cryogenic fluid transportation.

ASTM A519 (4130 / 4140)

Alloy mechanical tubing. Good hardenability after heat‑treatment, perfect for hydraulic cylinder blanks, shafts and heavy‑load mechanical structural components.

API 5L Line Pipe Grades (B, X42, X52, X60, X70)

Pipeline‑special carbon steel for on‑shore & offshore oil‑gas long‑distance transmission; PSL1 / PSL2 two inspection levels available.

Chemical Composition (Weight %)

Note: Iron (Fe) is balance element; Cr‑Mo alloy grades contain additional Chromium & Molybdenum according to respective standards.

Related Material Grades

1. Carbon Seamless Pipe: ASTM A53 A/B, ASTM A106 A/B, SA179, SA192, SA210
2. Heat‑Resistant Alloy Pipe: ASTM SA335 P9/P11/P22/T91, ASTM A519 4130,4140
3. Low‑Temperature Pipe: ASTM A333 Gr.6
4. API Line Pipe & Casing: API 5L PSL1/PSL2 (B, X42‑X70), API 5CT J55/N80/L80/P110
5. Stainless Seamless Pipe: 304,316L,321,310S
6. Hollow Structural Section: Q235B, Q345B, SS400 square & rectangular steel tube

Key Advantages

No Weld‑Seam Weakness

Monolithic billet piercing forming without welding seam; much higher pressure‑bearing safety factor than ERW/SAW welded pipes for high‑pressure service.

Dual Hot‑Rolled & Cold‑Drawn Process

Hot‑rolled for large‑size heavy‑wall low‑cost bulk supply; cold‑drawn delivers tight tolerance, smooth inner‑outer surface for precision mechanical blank parts.

Wide‑Range Grade & Standard Coverage

Covers fluid‑conveying, boiler high‑temperature, low‑temperature, oil‑gas pipeline and mechanical‑component requirements; one‑stop material‑selection for diversified industrial projects.

Strict Dimensional Tolerance Control

Separate tolerance specifications for hot‑rolled and cold‑drawn products, meet ASME B36.10M size requirements for engineering assembly.

Complete Testing & Traceability

Every batch passes hydrostatic, UT and mechanical testing; heat number traceable with official MTC inspection documents for global project acceptance.

Strong Secondary‑Processing Compatibility

Excellent cutting, boring, turning and welding performance; can be machined into hydraulic cylinder, shaft and hollow component blanks according to customer drawings.

Typical Applications

• Oil & Gas Industry: API 5L line pipe for crude oil & natural gas transmission; API 5CT casing & tubing for well‑drilling projects
• Power & Boiler Plant: SA192 / SA210 / SA335 thick‑wall tubes for boiler, superheater, heat‑exchanger and high‑temperature process piping
• Hydraulic & Mechanical Equipment: A519 thick‑wall tube for hydraulic cylinder barrel, heavy‑load mechanical hollow shaft blanks
• Fluid Conveyance: Water, steam, gas, petroleum medium transmission pipelines for petrochemical and general‑industrial plants
• Low‑Temperature Engineering: ASTM A333 Gr.6 pipe for cryogenic fluid pipeline systems
• Geological Drilling & Mining: Drill pipe, geological exploration thick‑wall tubular components
• Structural Purpose: Heavy‑duty mechanical frame, support hollow structural parts

Processing Service

We provide integrated forging and precision machining services, and can produce finished components strictly according to customer drawings:
Turning, milling, planing, drilling, boring, grinding
Gear cutting, CNC precision machining
Sizing cutting, surface treatment and finishing

We have supplied a wide range of forged and machined parts including shafts, cylinders, hollow bars, pistons, tube sheets, rings and disc bearings to customers worldwide.

Quality Assurance

We have a professional QC inspection team and complete testing equipment to ensure stable and reliable product quality:
Ultrasonic testing (UT) for internal defects
Tensile and hardness testing for mechanical properties
High‑precision dimensional measurement
Spectrometer for chemical composition verification
Metallographic microstructure inspection

Every batch of products undergoes strict inspection before delivery to meet the quality requirements of various engineering projects.

Packing & Delivery

Packing

Inner packaging: waterproof polybag for moisture and dust protection
Outer packaging: reinforced wooden case / wooden pallet, suitable for long‑distance international transportation
Custom packaging solutions available upon request
Extra protection: Plastic end caps fitted on both pipe ends to prevent collision damage; steel strapping bundling with printed batch & heat‑number labels.

Lead Time

Normally 10 – 45 days after receipt of advance payment
Exact delivery time depends on order quantity, specification complexity and machining requirements
Stock standard‑spec thick‑wall seamless pipes: lead‑time 10‑30 working days.