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50mm ASTM A519 Alloy Steel Hydraulic Cylinder Tube for Precision Mechanical

China 50mm ASTM A519 Alloy Steel Hydraulic Cylinder Tube for Precision Mechanical

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50mm ASTM A519 Alloy Steel Hydraulic Cylinder Tube for Precision Mechanical

MOQ： 5 tons
Price： 600-1200 USD/tons
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Standard	ASTM A519
Supply Ability	60000 tons per year
Delivery Time	5-8 weeks work days
Packaging Details	Could be in cartons or Wooden Box
Steel grade	SAE1010,SAE1020,SAE1026,SAE4130,SAE4140
Shape	Round
Outside diameter	50-350mm
Length	according to customer's request
Usage	Mechanical Tubing
Porudction Method	Cold drawing or cold rolling
Material	Carbon and Alloy Steel
Wall thickness	0.5-35mm
Brand Name	TORICH
Model Number	ASTM A519
Certification	ISO 9001-2008 TS16949 ISO 14001 NK RINA
Place of Origin	China

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Product Specification


Standard	ASTM A519	Supply Ability	60000 tons per year
Delivery Time	5-8 weeks work days	Packaging Details	Could be in cartons or Wooden Box
Steel grade	SAE1010,SAE1020,SAE1026,SAE4130,SAE4140	Shape	Round
Outside diameter	50-350mm	Length	according to customer's request
Usage	Mechanical Tubing	Porudction Method	Cold drawing or cold rolling
Material	Carbon and Alloy Steel	Wall thickness	0.5-35mm
Brand Name	TORICH	Model Number	ASTM A519
Certification	ISO 9001-2008 TS16949 ISO 14001 NK RINA	Place of Origin	China
High Light	honed hydraulic cylinder tube ，hydraulic cylinder pipe

50mm ASTM A519 Hydraulic Cylinder Pipe Alloy Steel Mechanical Tubing

ASTM A519 hydraulic cylinder tubing is seamless carbon or alloy steel mechanical tubing intended for precision-machined components such as hydraulic cylinder barrels. For a 50 mm tube size, the tubing can be supplied cold drawn and subsequently honed or skived and roller burnished to achieve a controlled bore dimension and low internal surface roughness.

ASTM A519 covers seamless hot-finished and cold-finished mechanical tubing manufactured in carbon and alloy steel grades. The standard applies to round tubing up to 325 mm outside diameter, making the 50 mm size well within its dimensional scope.

Common material options for hydraulic cylinder tubing include 1010, 1020, 1026, 4130 and 4140, selected according to required strength, machinability, welding requirements and heat-treatment condition.

Specifications

Item	Specification
Product	Seamless Mechanical Steel Tube for Hydraulic Cylinder
Standard	ASTM A519 / ASTM A519M
Material	Carbon Steel / Chromium-Molybdenum Alloy Steel
Typical Grades	1010, 1020, 1026, 4130, 4140
Nominal Size	50 mm available
Outside Diameter	30-325 mm
Wall Thickness	3-35 mm, customizable
Length	1-12 m, cut lengths available
Manufacturing Process	Seamless, Cold Drawn
Bore Finishing	Honing or Skiving and Roller Burnishing
Delivery Condition	Cold Finished, Stress Relieved, Annealed, Normalized or Heat Treated as specified
ID Tolerance After Finishing	H8 / H9 commonly available
Straightness	Typically 0.2-0.5 mm/m depending on finished condition
Honed Bore Roughness	Typically Ra 0.4-0.8 μm
Skived and Roller Burnished Bore Roughness	Typically Ra 0.2-0.4 μm
Surface Condition	Cold Drawn, Oiled, Honed ID or SRB ID
Inspection	Dimensional Inspection, Chemical Analysis, Mechanical Testing, Surface Inspection

ASTM A519 itself defines seamless mechanical tubing requirements and dimensional tolerances according to tube condition. Final hydraulic-cylinder bore tolerances and surface roughness should be specified separately on the purchase order because H8/H9 and honed or SRB surface requirements are finishing specifications rather than automatic ASTM A519 requirements.

Main Features

Precision Seamless Construction

ASTM A519 tubing is manufactured without a welded seam. Cold finishing can be used after hot working to obtain the required tube dimensions and mechanical characteristics. This construction is suitable for machining hydraulic cylinder barrels where circumferential dimensional consistency is important.

Controlled Hydraulic Cylinder Bore

After cold drawing, the internal diameter can be honed or processed by skiving and roller burnishing. Typical hydraulic-cylinder finished bore tolerances are H8 or H9. For a finished cylinder barrel, the required bore dimension should be specified by ID and tolerance rather than relying only on OD and wall thickness.

Low Internal Surface Roughness

Honed tubing commonly reaches approximately Ra 0.4-0.8 μm, while skived and roller burnished tubing can typically reach approximately Ra 0.2-0.4 μm. The smoother SRB surface is particularly useful where piston seals run directly against the tube bore.

Wide Material Selection

Low-carbon grades such as 1010, 1020 and 1026 provide good machinability and fabrication characteristics, while chromium-molybdenum grades such as 4130 and 4140 are available where higher strength or heat-treated performance is required.

Custom Cut Lengths

Tubing can be supplied in mill lengths or definite cut lengths according to drawings. ASTM A519 recognizes definite cut lengths when specified by the purchaser.

Our Advantages

Bore Tolerance Specified Separately from ASTM A519

One common purchasing problem is assuming that ordering "ASTM A519 tube" automatically defines the finished hydraulic-cylinder bore. It does not. ASTM A519 primarily controls the mechanical tubing itself, while the hydraulic bore usually requires an additional ID tolerance such as H8 or H9. We manufacture according to the complete drawing requirement, including nominal ID, finished ID tolerance, machining allowance and bore-finishing process. This reduces the risk of receiving ASTM-compliant tubing that still requires excessive internal machining.

Honing and SRB Selected According to Final Cylinder Requirements

Hydraulic cylinder manufacturers commonly need to choose between honing and skiving plus roller burnishing. Honing generally produces an approximately Ra 0.4-0.8 μm surface, while SRB can reduce roughness to approximately Ra 0.2-0.4 μm and is efficient for production quantities. The finishing method can therefore be specified according to required surface roughness, dimensional tolerance, cylinder design and subsequent machining rather than applying the same process to every tube.

Material and Heat-Treatment Condition Controlled Together

Mechanical properties of 1010, 1020, 1026, 4130 and 4140 can vary significantly with cold working, stress relieving, annealing, normalizing or quench-and-temper treatment. Material grade alone is therefore insufficient for a critical cylinder barrel. Orders can define both steel grade and final delivery condition, allowing chemical composition, dimensions, heat treatment and required mechanical properties to be checked as one manufacturing specification.

Execution Standards

Standard	Description
ASTM A519 / A519M	Seamless Carbon and Alloy Steel Mechanical Tubing
EN 10305-1	Seamless Cold Drawn Tubes for Precision Applications
DIN 2391	Cold Drawn Precision Seamless Steel Tubes, commonly referenced for hydraulic applications
JIS G3445	Carbon Steel Tubes for Machine Structural Purposes
GB/T 3639	Cold Drawn or Cold Rolled Precision Seamless Steel Tubes
GB/T 8162	Seamless Steel Tubes for Structural Purposes

Application

Hydraulic Excavator Boom Cylinder Barrel
A specific application is the barrel of a hydraulic excavator boom cylinder. Cold-drawn ASTM A519 tubing is machined and the internal bore is honed or skived and roller burnished to provide the dimensional accuracy and surface finish required for movement of the piston and sealing system. The tube can then undergo external machining, port connection fabrication and cylinder assembly according to the hydraulic cylinder design.

Chemical Composition

Grade	C %	Mn %	P % Max.	S % Max.	Si %	Cr %	Mo %
1010	0.08-0.13	0.30-0.60	0.040	0.050	-	-	-
1020	0.18-0.23	0.30-0.60	0.040	0.050	-	-	-
1026	0.22-0.28	0.60-0.90	0.040	0.050	-	-	-
4130	0.28-0.33	0.40-0.60	0.040	0.040	0.15-0.35	0.80-1.10	0.15-0.25
4140	0.38-0.43	0.75-1.00	0.040	0.040	0.15-0.35	0.80-1.10	0.15-0.25

Mechanical Properties

Grade	Typical Delivery Condition	Tensile Strength	Yield Strength	Elongation	Selection Consideration
1010	Cold Finished / Stress Relieved	To be specified by condition and drawing	To be specified by condition and drawing	To be specified	Low-carbon grade with good forming and machining characteristics
1020	Cold Finished / Stress Relieved	To be specified by condition and drawing	To be specified by condition and drawing	To be specified	Common carbon steel option for general cylinder barrels
1026	Cold Finished / Stress Relieved	To be specified by condition and drawing	To be specified by condition and drawing	To be specified	Higher carbon and manganese content than 1020
4130	Annealed / Normalized / Heat Treated	Depends on selected heat treatment	Depends on selected heat treatment	Depends on selected heat treatment	Cr-Mo alloy steel for higher-strength components
4140	Annealed / Normalized / Quenched and Tempered	Depends on selected heat treatment	Depends on selected heat treatment	Depends on selected heat treatment	Cr-Mo alloy steel for higher-strength and heat-treated applications

Frequently Asked Questions

Q: Are you trading company or manufacturer?

A: Manufacturer, also can do trading.

Q: How long is your delivery time?

A: Generally speaking, it is 10-15 days if the goods are in stock, or it is 30-40 days if the goods are not in stock, according to quantity.

Q: Do you provide samples? Is it free or extra?

A: Yes, we could offer the sample for free charge but need pay the cost of freight.

Q: What is your terms of payment?

A: Payment ≤ 2000 USD, 100% in advance. Payment ≥ 2000 USD, 30% T/T in advance, balance before shipment. If you have another question, please feel free to contact with me.

Company Details

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TORICH INTERNATIONAL LIMITED
Suite 1604-3, Hongan Plaza, #258 Die Yuan Road, Yinzhou District, Ningbo City, China
https://www.precision-steeltube.com/

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