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Seamless steel pipe for hydraulic applications

Seamless steel pipe for hydraulic applications

Process: Cold Drawn, Cold Rolled + Bright Annealed + Honed
Surface: Inner wall is burr-free, oxide-free, and strictly cleaned.
Ra：0.2 - 0.8μm (Inner Surface)
Material: Carbon Steel: 20# (AISI 1020), 45# (AISI 1045)
Low Alloy: Q355B (EN S355JR / ST52.3)
Specification: Outer Diameter: 10mm - 168mm；Wall Thickness: 2mm - 25mm

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ID-OD-WT（mm）

20-25-4.0 25-32-5.0 30-38-6.0 40-50-8.0 50-63-8.0 63-80-10.0 80-100-12.0 100-120-15.0 125-150-18.0 Custom Specs

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Product Detail

Product Overview：

Hydraulic seamless steel pipes are produced by adding alloy elements to high-quality carbon structural steel to enhance its strength, toughness, and hardenability. After fabrication, these steel pipes typically undergo processes such as tempering, chemical heat treatment, and surface quenching. Compared to high-quality carbon structural steel, they exhibit superior comprehensive mechanical properties. Although their corrosion resistance is not as good as stainless steel, their wear resistance and machinability are significantly better. Representative materials include 20#, 45#, 27SiMn, etc. These steel pipes are commonly used in important hydraulic support pipes, structural components in machinery, and hydraulic cylinders in coal mines.

Product List
Product Name:	Seamless steel pipe for GBT17396 hydraulic prop
Product Name:	GB8713 Precision inner diameter seamless steel tube for hydraulic cylinder barrel
Product Name:	20# hydraulic seamless steel pipe \| seamless pipe
Product Name:	45# hydraulic seamless steel pipe \| seamless pipe
Product Name:	27SiMn hydraulic seamless steel pipe \| seamless pipe
Product Name:	Seamless steel tube for precision cold rolling hydraulic applications \| Seamless tube
Product Name:	Hot-rolled hydraulic seamless steel pipe \| Seamless pipe
Product Name:	National standard hydraulic seamless steel pipe \| Seamless pipe

Parameter range
Outer diameter	10mm-168mm
Wall thickness	0.5mm - 20mm (Note: subject to OD)
Standard length	1m - 12m (Random or Fixed)
Outer diameter accuracy	Maximum ±0.03mm
Executive Standards	DIN 2391, ASTM A519, GB/T 3639
Non-standard customization	Custom sizes & lengths accepted (OEM/ODM Supported)

Commonly used high-frequency specifications in the market (outer diameter x wall thickness mm)
Inner diameter (mm)	20	25	30	40	50	63
Supporting outer diameter (mm)	25	32	38	50	63	80
Wall thickness range (mm)	2.5-4.0	3.0-5.0	3.0-6.0	3.0-8.0	3.5-8.0	4.0-10.0

Inner diameter (mm)	80	100	125	150	160	180
Supporting outer diameter (mm)	100	120	150	180	190	210
Wall thickness range (mm)	5.0-12.0	5.0-15.0	6.0-18.0	8.0-20.0	8.0-20.0	10.0-20.0
GB/T3639-2021: Precision Bright Tube (with outer diameter tolerance as the main criterion) GB/T8713: Hydraulic cylinder tube (with inner diameter tolerance H8/H9/H10 as the main, honing cylinder tube preferred)

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

Outer diameter tolerance (cold hard state+C/+LC)
Outer diameter (mm)	5-10	10-20	20-30	30-40	40-50	50-60	60-80	80-100
Outer diameter deviation (mm)	±0.08	±0.10	±0.15	±0.20	±0.25	±0.30	±0.35	±0.45
Heat treatment state (+SR annealing): The tolerance of the thin-walled tube is increased by 1.5-2 times Wall thickness tolerance: ± 10% S, minimum ± 0.10mm

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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Product Detail

Product Overview：

Product List
Product Name:	Seamless steel pipe for GBT17396 hydraulic prop
Product Name:	GB8713 Precision inner diameter seamless steel tube for hydraulic cylinder barrel
Product Name:	20# hydraulic seamless steel pipe \| seamless pipe
Product Name:	45# hydraulic seamless steel pipe \| seamless pipe
Product Name:	27SiMn hydraulic seamless steel pipe \| seamless pipe
Product Name:	Seamless steel tube for precision cold rolling hydraulic applications \| Seamless tube
Product Name:	Hot-rolled hydraulic seamless steel pipe \| Seamless pipe
Product Name:	National standard hydraulic seamless steel pipe \| Seamless pipe

Parameter range
Outer diameter	10mm-168mm
Wall thickness	0.5mm - 20mm (Note: subject to OD)
Standard length	1m - 12m (Random or Fixed)
Outer diameter accuracy	Maximum ±0.03mm
Executive Standards	DIN 2391, ASTM A519, GB/T 3639
Non-standard customization	Custom sizes & lengths accepted (OEM/ODM Supported)

Commonly used high-frequency specifications in the market (outer diameter x wall thickness mm)
Inner diameter (mm)	20	25	30	40	50	63
Supporting outer diameter (mm)	25	32	38	50	63	80
Wall thickness range (mm)	2.5-4.0	3.0-5.0	3.0-6.0	3.0-8.0	3.5-8.0	4.0-10.0

Inner diameter (mm)	80	100	125	150	160	180
Supporting outer diameter (mm)	100	120	150	180	190	210
Wall thickness range (mm)	5.0-12.0	5.0-15.0	6.0-18.0	8.0-20.0	8.0-20.0	10.0-20.0
GB/T3639-2021: Precision Bright Tube (with outer diameter tolerance as the main criterion) GB/T8713: Hydraulic cylinder tube (with inner diameter tolerance H8/H9/H10 as the main, honing cylinder tube preferred)

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

Outer diameter tolerance (cold hard state+C/+LC)
Outer diameter (mm)	5-10	10-20	20-30	30-40	40-50	50-60	60-80	80-100
Outer diameter deviation (mm)	±0.08	±0.10	±0.15	±0.20	±0.25	±0.30	±0.35	±0.45
Heat treatment state (+SR annealing): The tolerance of the thin-walled tube is increased by 1.5-2 times Wall thickness tolerance: ± 10% S, minimum ± 0.10mm

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