ASTM A519 8620 Seamless Steel Tubes (SAE 8620 / AISI 8620 / UNS G86200)
ASTM A519 8620 seamless steel tubes are widely used in industries that need strong, tough, and reliable mechanical tubing. These tubes are produced from AISI 8620 alloy steel (UNS G86200) and supplied under the ASTM A519 / ASME SA519 tube standard. Because of their excellent balance of strength, toughness, and heat treatment capability, they are a preferred choice for automotive, machinery, engineering, and heavy equipment applications.
As experienced ASTM A519 Grade 8620 carbon steel mechanical tubing suppliers, we focus on delivering products that perform reliably in real-world conditions. Our ASTM A519 8620 seamless steel tube range is used in parts where both surface hardness and core toughness are required—such as gears, shafts, bushings, sleeves, and structural mechanical components.
This guide explains everything you need to know about A519 8620 seamless tubes UNS G86200 in simple, clear language—covering material basics, standards, specifications, SAE 8620 chemical composition, SAE 8620 mechanical properties, SAE 8620 hardness in HRC, applications, and buying considerations.
What Are ASTM A519 8620 Seamless Steel Tubes?
ASTM A519 SA519 tube products are mechanical tubes made from carbon or alloy steel and produced using a seamless manufacturing process. “Seamless” means there is no welded joint, which gives the tube:
- Better strength and uniform structure
- Higher reliability under pressure and load
- Improved fatigue and impact resistance
When this standard is combined with SAE 8620 alloy steel, the result is a tube that offers excellent machinability, good toughness, and outstanding response to heat treatment. This is why ASTM A519 8620 tubes are commonly used for critical machine parts that must handle stress, friction, and repeated loading.
Understanding AISI 8620 Alloy Steel (SAE 8620 / UNS G86200)
AISI 8620 steel, also known as SAE 8620 steel or UNS G86200, is a nickel-chromium-molybdenum alloy steel. Each alloying element plays a role:
- Nickel improves toughness and impact strength
- Chromium increases wear resistance and hardenability
- Molybdenum improves strength and performance at higher temperatures
Because of this combination, SAE 8620 alloy steel is especially popular for carburized components—parts that need a hard, wear-resistant surface and a tough, shock-resistant core. When supplied as A519 8620 seamless steel tubes, this material becomes ideal for precision mechanical components.
SAE 8620 Hardness (HRC)
In its untreated condition, SAE 8620 steel has moderate hardness, which makes it easy to machine and form. After proper heat treatment, especially carburizing, the surface hardness can increase greatly.
- Core hardness: Typically lower, keeping the part tough and shock-resistant
- Surface hardness: Can reach high values on the Rockwell scale
- This is why SAE 8620 hardness in HRC is often discussed in relation to case-hardened components
In simple terms, AISI 8620 steel allows engineers to design parts that are hard on the outside and tough on the inside—a perfect combination for gears, shafts, and wear-prone components.
Carbon Steel vs AISI 8620 Alloy Steel Tubes
Some buyers compare plain carbon steel tubes with AISI 8620 steel tubes. Here’s a simple way to look at it:
Carbon Steel Tubes:
- Lower cost
- Suitable for basic structural or low-stress applications
- Limited performance after heat treatment
AISI 8620 Alloy Steel Tubes:
- Better strength and toughness
- Excellent for surface hardening
- Longer service life in demanding applications
- More reliable for critical mechanical components
For parts where performance, safety, and durability matter, ASTM A519 8620 seamless steel tubes are usually the better long-term choice.
ASTM A519 8620 Tubes – Product Specification Chart
To help buyers and engineers quickly understand the product range, here is a clear specification chart for ASTM A519 8620 seamless tubes. These values represent typical supply conditions and can be customized based on project needs.
ASTM A519 8620 Seamless Steel Tube – Specifications
| Parameter | Details |
| Standard | ASTM A519 / ASME SA519 |
| Grade | 8620 |
| Material | AISI 8620 alloy steel / SAE 8620 steel |
| UNS Number | G86200 |
| Manufacturing | Seamless |
| Outside Diameter | 6 mm to 630 mm (custom sizes available) |
| Wall Thickness | 1 mm to 100 mm (as per requirement) |
| Length | Random, fixed, or cut-to-length |
| Form | Round (other shapes on request) |
| Surface Finish | Black, bright drawn, peeled, polished |
| End Finish | Plain, chamfered, as specified |
| Condition | As-rolled, normalized, or heat treated |
| Applications | Mechanical, automotive, structural components |
This wide size and condition range makes ASTM A519 8620 tubes suitable for both light and heavy engineering applications.
SAE 8620 Chemical Composition (Typical)
The performance of ASTM A519 8620 seamless steel tubes comes mainly from their controlled alloy content. Below is a typical SAE 8620 chemical composition range. Exact limits may vary slightly as per specification and order requirements.
SAE 8620 Chemical Composition (%)
| Element | Typical Range |
| Carbon (C) | 0.18 – 0.23 |
| Manganese (Mn) | 0.70 – 0.90 |
| Silicon (Si) | 0.15 – 0.35 |
| Nickel (Ni) | 0.40 – 0.70 |
| Chromium (Cr) | 0.40 – 0.60 |
| Molybdenum (Mo) | 0.15 – 0.25 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
This balanced composition is what gives AISI 8620 alloy steel UNS G86200 its well-known combination of strength, toughness, and heat treatment capability.
SAE 8620 Mechanical Properties
The SAE 8620 mechanical properties depend on the supply condition (as-rolled, normalized, or heat treated). In general, ASTM A519 8620 seamless steel tube products offer a strong and reliable mechanical profile suitable for demanding applications.
Typical Mechanical Properties of SAE 8620 Steel
| Property | Typical Value |
| Tensile Strength | 530 – 760 MPa |
| Yield Strength | 385 – 530 MPa |
| Elongation | 12 – 20% |
| Reduction of Area | ~50% (typical) |
| Impact Toughness | Good (varies with heat treatment) |
These values can change significantly after carburizing, quenching, and tempering, which is why SAE 8620 alloy steel is so popular for parts that need customized performance.
Applications of ASTM A519 8620 Seamless Steel Tubes
Because of their strength, toughness, and wear resistance, ASTM A519 8620 tubes are widely used in:
- Automotive parts (gears, shafts, axles, transmission components)
- Heavy machinery and equipment
- Construction and mining equipment
- Agricultural machinery
- Bushings, sleeves, and couplings
- Power transmission components
- Structural mechanical parts
- Tool and die components
If a component must handle load, friction, and repeated stress, A519 8620 seamless steel tube is often a proven solution.
SAE 8620 Standard and Specification Explained
The SAE 8620 standard and SAE 8620 specification define the chemical and general mechanical expectations of this alloy steel. The ASTM A519 / ASME SA519 standard, on the other hand, defines how the tube should be manufactured, tested, and supplied. In short:
- SAE / AISI 8620 = Defines the steel grade
- ASTM A519 / SA519 = Defines the mechanical tubing standard
Together, they ensure that ASTM A519 SA519 tube products are consistent, reliable, and suitable for critical engineering use.
Why Choose ASTM A519 SA519 Tube in Grade 8620?
There are many mechanical tubing options, but ASTM A519 8620 tubes stand out for several practical reasons:
1. Excellent Heat Treatment Response: SAE 8620 specification is well known for carburizing and case hardening. This allows manufacturers to fine-tune surface hardness without losing core toughness.
2. Reliable Seamless Construction: Because A519 8620 seamless tubes have no weld seam, they offer:
- Better strength uniformity
- Higher fatigue resistance
- Improved safety in critical components
3. Good Machinability: Before heat treatment, SAE 8620 steel machines easily, helping reduce production time and tool wear.
4. Long Service Life: Thanks to its alloy design and heat treatment capability, AISI 8620 alloy steel UNS G86200 components often last longer in demanding service conditions.
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ASC LLP boasts a robust global presence, committed to delivering unparalleled service and quality to clients around the world. Our dedication to prompt delivery and exceptional customer care sets us apart in the industry. Major corporations across the USA, Europe, Asia, and other regions place their trust in our high-quality 1020 round bars. This widespread trust underscores our reputation for reliability and excellence. By consistently meeting and exceeding the expectations of our international clientele, we continue to solidify our position as a leader in the global steel market.
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