Applications: hydraulic cylinder barrel, pressure vessel, machinery parts, bushing, mining & petroleum equipment, machining blanks.
MTR certificates available, custom specifications supported.

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OD*WT（mm）

89*12 108*12 114*16 133*16 168*18 168*20 219*18 325*35 377*45 Custom Specs

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Product Detail

Product Overview：

Heavy‑wall seamless steel tube features substantial wall thickness, excellent internal‑pressure resistance and impact‑load performance. There is no strict global standard definition; industry convention defines heavy‑wall tube when wall thickness exceeds 10% of outer diameter.

Material Grades List
ASTM A106 Gr.B, SAE 1020	General‑purpose carbon grade, widely used for mechanical machining, hydraulic barrels and conventional pressure vessels.
ASTM A572 Gr.50, EN S355JR	Higher tensile strength than plain carbon steel, preferred for heavy‑duty machinery and engineering equipment.
AISI 5140, EN 41Cr4 (1.7035)	High‑strength alloy steel with good wear‑resistance, suitable for hydraulic cylinder components and machined mechanical parts.
ASTM A312 TP304 / TP316L	Corrosion‑resistant stainless heavy‑wall tubes for chemical processing and corrosive fluid service.

Manufacturing Processes：

Hot‑rolled: For large outer diameter and heavy‑wall specifications, cost‑effective for bulk orders with normal dimensional tolerance.

Cold‑drawn: Tighter OD & wall‑thickness tolerance, smoother surface finish, for high‑precision requirements at higher unit cost.

Main Applications：

Hydraulic cylinder barrels, high‑pressure vessels, heavy‑duty machinery components, mining & petroleum equipment, mechanical bushings and further machining cutting stock.

Optional tolerance range
Tolerance control	Optional manufacturing process
Tolerance ≤ 0.05 mm	Cold rolling
Tolerance ≤ 0.10 mm	Cold rolling
Tolerance ≤ 0.30 mm	Cold drawing \| Cold rolling
Tolerance ≤ 0.50 mm	Cold drawing \| Hot rolling
Tolerance ≤ 1.00 mm	Hot rolling \| Hot expanding

Wall thickness tolerance value (Hot-rolled thick wall)
Wall thickness (mm)	12	14	16	18	20	22	25	30	35	40	45
Upper deviation (mm)	+1.50	+1.75	+2.00	+2.25	+2.50	+2.75	+3.13	+3.75	+4.38	+5.00	+5.63
Lower deviation (mm)	-1.20	-1.40	-1.60	-1.80	-2.00	-2.20	-2.50	-3.00	-3.50	-4.00	-4.50
Wall thickness qualified range (mm)	10.80-13.50	12.60-15.75	14.40-18.00	16.20-20.25	18.00-22.50	19.80-24.75	22.50-28.13	27.00-33.75	31.50-39.38	36.00-45.00	40.50-50.63
All calculations are based on fixed millimeter values, without a percentage formula; Wall thickness deviation:+12.5% S/-10% S

Wall thickness value of hot expansion thick walled tube (Deviation+17.5% S/-12.5% S)
Wall thickness (mm)	12	16	20	25	30
Upper deviation (mm)	+2.10	+2.80	+3.50	+4.38	+5.25
Lower deviation (mm)	‑1.50	‑2.00	‑2.50	‑3.13	‑3.75
Wall thickness qualified range (mm)	10.50‑14.10	14.00‑18.80	17.50‑23.50	21.87‑29.38	26.25‑35.25

Length&straightness (fixed values)
Project	Fixed length	Fixed length	Bending degree per meter
Condition	L ≤ 6m	L ≤ 6m	Thick walled S>15mm
Allowable deviation	+30 / 0 mm	+50 / 0 mm	≤2.0 mm/m

Optional delivery status
Oil removal from oil pipes	Annealing and straightening	Steel pipe corrosion prevention
Steel pipe threading	Length cut-to-length	Steel pipe coating
Steel pipe cap	Exquisite bundling	Beveling

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