ASTM A519 4130 Tubes | Chromoly Seamless Mechanical & Boiler Steel Tubing
ASTM A519 4130 tubes are widely used when high strength, toughness, and reliability are non-negotiable. Known for their chromium-molybdenum (chromoly) alloy composition, these tubes offer excellent performance under high pressure, high temperature, and heavy mechanical stress.
As one of the trusted ASTM A519 4130 steel chromoly tubing suppliers in India, we supply precision-engineered tubing that meets strict international standards and real-world industrial demands.
What Is ASTM A519 Grade 4130 Steel Tubing?
ASTM A519 Grade 4130 steel tubing is a seamless mechanical tube made from chromium-molybdenum alloy steel. The presence of chromium improves corrosion resistance and hardness, while molybdenum enhances strength at elevated temperatures.
This combination makes A519 Gr 4130 seamless steel tubing ideal for applications where normal carbon steel tubes may fail.
ASTM A519 covers hot-finished and cold-finished seamless mechanical tubing, and Grade 4130 is one of the most popular alloy grades within this specification.
Key Advantages of ASTM A519 Grade 4130 Steel Tubing
- High Strength-to-Weight Ratio: Allows engineers to design lighter components without sacrificing strength.
- Excellent Heat Resistance: Performs well under elevated temperatures, ideal for boiler and steam systems.
- Superior Fatigue Resistance: Handles repeated stress cycles better than standard carbon steel tubing.
- Good Machinability: Easier to machine compared to higher alloy steels.
- Proven Industry Performance: Used for decades in critical industrial applications.
Why ASTM A519 4130 Is Called “Chromoly Steel”
The term chromoly steel comes from:
- Chromium (Cr) – Improves wear resistance and hardenability
- Molybdenum (Mo) – Adds strength, creep resistance, and toughness
Because of this alloy chemistry, cold finished 4130 chromoly steel tubing delivers:
- High tensile strength
- Excellent fatigue resistance
- Good weldability (with proper heat treatment)
- Long service life in demanding environments
ASTM A519 4130 Tubes – Manufacturing Process
We manufacture and supply ASTM A519 Grade 4130 steel tubing using carefully controlled processes to ensure consistent quality.
Hot Finished ASTM A519 4130 Tubing
- Produced at high temperatures
- Better for thicker walls
- Ideal for structural and heavy mechanical applications
- Commonly used where surface finish is less critical
As an experienced ASTM A519 4130 hot finished tubing stockist, we maintain ready stock for urgent project needs.
Cold Finished 4130 Chromoly Steel Tubing
- Drawn at room temperature
- Tighter dimensional tolerance
- Smooth surface finish
- Higher strength and hardness
Cold finished tubes are preferred for precision mechanical tubing and automotive components.
ASTM A519 4130 Tubes – Specifications
| Standard | ASTM A519 / ASME SA 519 |
| Grade | 4130 |
| Type | Seamless Mechanical Steel Tubing |
| Manufacturing | Hot Finished / Cold Finished |
| Form | Round |
| Heat Treatment | Annealed / Normalized / Q&T (as required) |
| Length | Random, Cut Length |
| End Finish | Plain End, Beveled End |
Chemical Composition of ASTM A519 Grade 4130 Steel Tubing
The alloy chemistry is the backbone of ASTM A519 4130 tubes performance.
| Element | Percentage (%) |
| Carbon (C) | 0.28 – 0.33 |
| Manganese (Mn) | 0.40 – 0.60 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Silicon (Si) | 0.20 – 0.35 |
| Chromium (Cr) | 0.80 – 1.10 |
| Molybdenum (Mo) | 0.15 – 0.25 |
This balanced chemistry allows ASTM A519 Grade 4130 mechanical tubing to maintain strength without becoming brittle.
Mechanical Properties of A519 Gr 4130 Seamless Steel Tubing
| Property | Typical Value |
| Tensile Strength | 560 – 760 MPa |
| Yield Strength | ≥ 460 MPa |
| Elongation | ≥ 18% |
| Hardness | As per heat treatment |
These properties make ASTM A519 Gr 4130 seamless mechanical steel tubing suitable for load-bearing and pressure applications.
ASTM A519 Grade 4130 vs Carbon Steel Tubing
| Feature | ASTM A519 4130 | Carbon Steel Tubing |
| Alloy Content | Chromium + Molybdenum | None |
| Strength | Higher | Moderate |
| Heat Resistance | Excellent | Limited |
| Fatigue Life | Long | Shorter |
| Cost | Higher | Lower |
For demanding environments, ASTM A519 Grade 4130 carbon steel tubing alternatives often fall short.
ASTM A519 4130 Tubes for Boiler & Steam Applications
Although ASTM A519 is primarily a mechanical tubing standard, ASTM A519 Grade 4130 boiler tubing is widely used in:
- Steam boiler components
- Heat exchanger parts
- Pressure vessels
- High-temperature piping systems
We supply ASME SA 519 Gr 4130 steam boiler tubing that meets strict dimensional and mechanical requirements, making it a reliable choice for thermal systems.
Applications of ASTM A519 4130 Tubes
Because of their mechanical reliability, A519 Gr 4130 tubes are used across multiple industries:
- Automotive chassis and roll cages
- Aircraft and aerospace structural parts
- Oil & gas mechanical tubing
- Power plant boiler components
- Heavy engineering equipment
- Industrial machinery shafts
- Pressure vessels and fittings
As an ASTM A519 Grade 4130 mechanical tubing supplier, we understand that different applications require different tolerances—and we supply accordingly.
Why Choose Us for ASTM A519 4130 Tubes?
- Extensive stock of hot finished & cold finished tubes
- Consistent quality from approved mills
- Industry-experienced technical support
- Competitive pricing
- On-time delivery
We don’t just supply steel—we help customers choose the right tubing for the right application of ASTM A519 4130 steel tube based on real-world experience.
ASTM A519 4130 steel chromoly tubing supplier in India
ASTM A519 Grade 4130 steel tubing is a trusted solution for industries that demand strength, durability, and long-term reliability. Whether you need A519 Gr 4130 seamless mechanical steel tubing, chromoly boiler tubing, or precision cold finished tubes, this grade consistently delivers high performance.
If you are looking for dependable ASTM A519 4130 steel chromoly tubing suppliers in India, we are ready to support your project with quality products and expert guidance.
Global Reach
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 ASTM A519 4130 Tubes. 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.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
