ASTM A519 Seamless Mechanical Tubing Supplier | High-Performance A519 Steel Tube
Huagang Industry is a leading supplier of premium ASTM A519 seamless mechanical tubing. Explore our extensive inventory of A519 tube & A519 mechanical tubing. Get detailed ASTM A519 chemical composition & A519 tubing mechanical properties data. Understand the critical differences of A513 vs A519. Request a quote for high-tolerance, high-strength solutions for oil & gas, automotive, and aerospace.
Product Info
ASTM A519 Seamless Mechanical Tubing: Precision and Performance for Demanding Applications
Welcome to Huagang Industry, your trusted partner for high-quality ASTM A519 seamless mechanical tubing. This specification covers a range of carbon and alloy steel grades engineered for applications requiring close tolerances, superior surface finish, and definitive physical properties. Whether you're designing hydraulic cylinders, automotive drive shafts, or drilling equipment, our A519 steel tube delivers the reliability and performance your projects demand.
Why Choose ASTM A519 Seamless Tubing?
ASTM A519 is the go-to standard for mechanical components where structural integrity, precision, and strength are non-negotiable. Unlike welded tubing, A519 tubing is manufactured through a seamless process, creating a uniform grain structure that provides consistent strength and durability around the entire circumference. This makes it ideal for high-pressure, high-stress, and high-fatigue environments.
Key Advantages of Our A519 Mechanical Tubing
Exceptional Dimensional Accuracy: Our cold-drawn A519 tube is produced with extremely tight outer diameter (OD) and inner diameter (ID) tolerances, enabling precise fits and reducing secondary machining costs.
Superior Surface Finish: The cold-drawing process results in a smooth, scale-free surface that is ideal for cosmetic applications or where surface friction must be minimized.
Enhanced Mechanical Properties:The cold-working process strain-hardens the material, increasing its strength and hardness. Subsequent heat treatments can be applied to achieve a perfect balance of strength, toughness, and ductility.
No Weld Seam: The seamless construction eliminates the risk of weld-line failure, ensuring maximum reliability under cyclic loading and high internal pressure.
Detailed Product Data & Specifications
Available Grades and Forms
We supply a comprehensive range of ASTM A519 grades to meet diverse application needs:
Carbon Steels: 1020, 1026
Alloy Steels: 4130, 4140, 4142, 4340, 8620
Our A519 mechanical tubing is available in:
Shapes: Round, Square, Rectangular
Conditions: Hot-Finished, Cold-Finished (Cold-Drawn), and various Heat-Treated states (Annealed, Normalized, Quenched & Tempered).
Industry Applications of A519 Steel Tube
ASTM A519 tubes are versatile and critical across multiple sectors:
Oil & Gas: Drill collars, downhole tools, valve bodies, manifolds, and high-pressure flow lines.
Automotive & Transport: Drive shafts, axle tubes, hydraulic cylinders, suspension components, and gear blanks.
Aerospace & Defense: Landing gear components, airframe structures, actuator cylinders (often to stricter standards like AMS 6341).
Heavy Equipment & Machinery: Rollers, hydraulic rams, pivot pins, and structural members for agricultural and construction machinery.
Precision Manufacturing: Guides, spindles, and shafts for CNC equipment, printing presses, and automation systems.
Packaging, Marking & Delivery
Packaging: Bundled (hexagonal), Wooden Boxes, Crates (steel/wooden), or as per customer requirements to prevent damage in ordinary handling and transportation.
Marking: Clearly marked with Standard, Steel Grade, Size, Heat No., and Lot No. for full traceability.
Port of Shipment: Shanghai, China
Payment Terms: T/T (Telegraphic Transfer), L/C (Letter of Credit)
Why Choose Huagang Industrial?
When you source your ASTM A519 tubes from Huagang Industry, you get more than just metal; you get a partnership.
Extensive Inventory: We maintain a large stock of common grades and sizes, ensuring quick lead times and reliable supply.
Technical Expertise: Our team provides unparalleled support on material selection, helping you navigate ASTM A519 chemical composition and mechanical properties to find the optimal grade for your application.
Quality Assurance: Every batch of our A519 mechanical tubing comes with full traceability and certified mill test reports (CMTRs) to ensure compliance with ASTM standards.
Value-Added Services: We offer cutting, machining, and heat treatment services to deliver a finished component ready for assembly, saving you time and cost.
Product Properties
Chemical Composition of A519 Mechanical Tubing
The performance of A519 material is rooted in its precise chemical makeup. Below is the composition for popular grades.
Element (%) | Grade 1020 | Grade 4130 | Grade 4140 |
Carbon (C) | 0.18-0.23 | 0.28-0.33 | 0.38-0.43 |
Manganese (Mn) | 0.30-0.60 | 0.40-0.60 | 0.75-1.00 |
Chromium (Cr) | - | 0.80-1.10 | 0.80-1.10 |
Molybdenum (Mo) | - | 0.15-0.25 | 0.15-0.25 |
Phosphorus (P) max | 0.040 | 0.035 | 0.035 |
Sulfur (S) max | 0.050 | 0.040 | 0.040 |
A519 Tubing Mechanical Properties (Typical Quenched & Tempered)
The A519 tubing mechanical properties can be tailored through heat treatment. The following are typical minimum values for hardened conditions.
Mechanical Property | Grade 1020 (CD)* | Grade 4130 (Q&T) | Grade 4140 (Q&T) |
Yield Strength | 50,000 psi (345 MPa) | 85,000 psi (586 MPa) | 100,000 psi (689 MPa) |
Tensile Strength | 65,000 psi (448 MPa) | 105,000 psi (724 MPa) | 125,000 psi (862 MPa) |
Elongation (% in 2") | 25% | 12% | 10% |
Hardness (Brinell) | ~121 HB | ~200 HB | ~285 HB |
*CD = Cold Drawn (as-drawn condition)
Standard Size and Tolerance Ranges (Cold-Drawn Round Tube)
Parameter | Range | Standard Tolerance (Example) |
Outer Diameter (OD) | 0.250" to 12.75" (6.0mm to 323mm) | ±0.005" on 2" OD Tube |
Wall Thickness (WT) | 0.028" to 2.000" (0.7mm to 50mm) | ±10% of specified wall |
Length | Custom Cut to Length | Standard mill lengths or cut to your specifications |
(Note: Tolerances vary based on size and production method. Please consult our technical team for specific tolerance requirements.)
Technological Advantages & Quality Control
Technological Advantages
With nearly two decades of expertise, Huagang is recognised as a top precision seamless steel tube manufacturer. We integrate R&D, production, quality management, logistics, and global customer service, enabling customers to secure stable supply and consistent product performance.
Our long-term partnerships with global brands demonstrate our capability to meet rigorous quality expectations.
Adopting cold drawn precision seamless technology to ensure high dimensional accuracy, smooth surface, and uniform wall thickness of steel tubes.
After heat treatment and surface treatment, the mechanical properties and corrosion resistance of the steel tube are further improved.
Adopting cold drawn precision seamless technology to ensure high dimensional accuracy, smooth surface, and uniform wall thickness of steel tubes. | After heat treatment and surface treatment, the mechanical properties and corrosion resistance of the steel tube are further improved. |
Delivery Status:
Designation | Symbol | Description |
Cold drawn / hard | +C (BK) | After the last cold forming no heat treatment. |
Cold drawn / soft | +LC (BKW) | After the last heat treatment, follows the cold drawing there is a light finishing pass. |
Cold drawn and stress relieved annealed | +SR (BKS) | After the final cold drawing process, the tubes are stress-relieved and annealed in a controlled atmosphere. |
Annealed | +A (GBK) | After the last cold drawing process, the tubes are annealed in a controlled atmosphere. |
Normalized | +N (NBK) | After the last cold drawing process, the tubes are normalized in a controlled atmosphere. |
Quality Control
Check Each One Individually Hydraulic test: Each steel tube undergoes a hydraulic test to ensure good sealing and pressure bearing capacity in high-pressure environments. Non destructive testing: Using ultrasonic, eddy current, or magnetic flux leakage testing techniques to detect internal defects in steel tubes and ensure product quality. | Testing Standards Compliant with international standards such as GB/T 8163, GB/T 3087, GB/T 5310, DIN, JIS, EN, ASTM, etc. Each batch of products comes with detailed quality inspection reports and certificates of conformity. | Certification Guarantee Obtained ISO/TS16949:2009 quality system certification and obtained the national special equipment pressure pipeline component manufacturing license. |
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