ASTM A519 Carbon and Alloy Steel Mechanical Tubing : Seamless Tubing For High-strength Machining And Structural Applications

ASTM A519 Carbon and Alloy Steel Mechanical Tubing is a premium seamless mechanical tubing engineered for high-strength, precision, and corrosion resistance in demanding applications. Conforming to the ASTM A519 standard, this carbon steel tubing and alloy steel tubing is designed for machining, heat treating, and structural uses in industries like automotive, aerospace, and construction. Available in grades such as 1026, 4130, and 4140, it offers tailored mechanical properties to meet specific requirements, ensuring durability in industrial piping and mechanical systems.

The ASTM A519 Mechanical Tubing is manufactured through hot-rolling or cold-drawing processes, followed by heat treatments like normalizing, annealing, or quenching and tempering to achieve optimal strength and toughness. Available in round, square, rectangular, or special shapes, with outer diameters from 1/4” to 50 7/8” and wall thicknesses from 1mm to 25mm, it supports diverse project needs. Surface treatments such as galvanizing, FBE, or 3LPE coatings enhance corrosion resistance, protecting against environmental wear in industrial piping applications. Plain, beveled, or threaded ends ensure seamless integration into complex systems.

The Seamless Mechanical Tubing undergoes rigorous testing, including tensile, hardness, flattening, and nondestructive tests, to ensure compliance with ASTM A519 standards. For example, Grade 1026 offers a tensile strength of approximately 480 MPa and a yield strength of 310 MPa, while alloy grades like 4130 and 4140 provide higher strength for high-stress applications. These properties make the tubing ideal for hydraulic cylinders, automotive components, and structural frameworks, where corrosion resistance and precision are critical. The tubing’s heat-treatable nature allows for customized properties, enhancing its suitability for specific mechanical demands.

Compatible with fittings and components conforming to standards like ASTM A234 or A105, the ASTM A519 Mechanical Tubing integrates seamlessly into industrial piping and structural systems. Compared to other standards like ASTM A106 or A335, ASTM A519 excels in mechanical applications requiring close tolerances and high strength, offering a cost-effective solution for machining and structural tasks. Its seamless construction ensures reliability under high-pressure conditions, making it a preferred choice for engineers seeking durable solutions for boiler pipeline protection and mechanical assemblies.

Engineered to address challenges like pipeline wear, corrosion, and mechanical stress, the ASTM A519 Carbon and Alloy Steel Mechanical Tubing delivers unmatched performance in harsh environments. Its precision manufacturing and robust alloy options make it ideal for applications requiring corrosion resistance and structural integrity, ensuring safety, longevity, and efficiency in automotive, aerospace, and construction projects.

Features Specifications – OD vs Wall Thickness
OD (mm)	Wall Thickness (mm)
	2	2.5	3	3.5	4	4.5	5	6	6.5–7	7.5–8	8.5–9	9.5–10	11	12
Φ25–Φ28	●	●	●	●	●	●
Φ32		●	●	●	●	●	●
Φ34–Φ36		●	●	●	●	●	●
Φ38		●	●	●	●	●	●
Φ40			●	●	●	●	●
Φ42			●	●	●	●	●
Φ45			●	●	●	●	●	●
Φ48–Φ60			●	●	●	●	●	●	●
Φ63.5				●	●	●	●	●	●	●
Φ68–Φ73					●	●	●	●	●	●
Φ76					●	●	●	●	●	●	●	●	●	●
Φ80					●	●	●	●	●	●	●	●	●	●
Φ83					●	●	●	●	●	●	●	●	●	●
Φ89					●	●	●	●	●	●	●	●	●	●
Φ95					●	●	●	●	●	●	●	●	●	●
Φ102					●	●	●	●	●	●	●	●	●	●
Φ108					●	●	●	●	●	●	●	●	●	●
Φ114						●	●	●	●	●	●	●	●	●
Φ121						●	●	●	●	●	●	●	●	●
Φ127						●	●	●	●	●	●	●	●	●
Φ133						●	●	●	●	●	●	●	●	●
Φ140							●	●	●	●	●	●	●	●
Φ146							●	●	●	●	●	●	●	●
Φ152							●	●	●	●	●	●	●	●
Φ159							●	●	●	●	●	●	●	●
Φ168							●	●	●	●	●	●	●	●

Chemical Composition (%) of ASTM A519
Grade	C	Mn	P ≤	S ≤	Si	Cr	Mo
1008	≤0.10	0.30–0.50	0.040	0.050	—	—	—
1010	0.08–0.13	0.30–0.60	0.040	0.050	—	—	—
1018	0.15–0.20	0.60–0.90	0.040	0.050	—	—	—
1020	0.18–0.23	0.30–0.60	0.040	0.050	—	—	—
1025	0.22–0.28	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	0.050	0.15–0.35	0.80–1.10	0.15–0.25
4140	0.38–0.43	0.75–1.00	0.040	0.050	0.15–0.35	0.80–1.10	0.15–0.25

Mechanical Properties of ASTM A519
Grade	Condition	Tensile (MPa)	Yield (MPa)	Elongation (%)
1020	CW	≥414	—	≥5
1020	SR	≥345	≥448	≥10
1020	A	≥193	≥331	≥30
1020	N	≥234	≥379	≥22
1025	CW	≥448	≥517	≥5
1025	SR	≥379	≥483	≥8
1025	A	≥207	≥365	≥25
1025	N	≥248	≥379	≥22
4130	SR	≥586	≥724	≥10
4130	A	≥379	≥517	≥30
4130	N	≥414	≥621	≥20
4140	SR	≥689	≥855	≥10
4140	A	≥414	≥552	≥25
4140	N	≥621	≥855	≥20
1026	（典型）	490	415	≈15

Comparison of ASTM A519 Grades with Other Standards
Feature	ASTM A519 Grade 1026	ASTM A519 Grade 4130	ASTM A106 Grade B
Material Type	Carbon Steel	Alloy Steel	Carbon Steel
Temperature Range	Moderate	Moderate to High	Moderate (up to 427°C)
Notch Toughness	Moderate	Good	Moderate
Corrosion Resistance	Good (With coatings)	Good (With coatings)	Good (With coatings)
Applications	Hydraulic Cylinders, Machining	Aerospace, High-Stress Parts	Boilers, General Piping
Tensile Strength (MPa)	~480	~670 (Normalized)	415 (min)
Yield Strength (MPa)	~310	~435 (Normalized)	240 (min)
Key Advantage	Cost-effective for general use	High strength and toughness	General-purpose versatility

ASTM A519 seamless carbon steel precision mechanical tubing

ASTM A519 seamless carbon steel precision mechanical tubing finds applications in various industries, including automotive, machinery, construction, and transportation. It is commonly used for the production of components such as bushings, bearings, cylinders, and shafts.

What are the grades of alloy steel?

Alloy steel pipes are categorized by both standards and grades, each designed for specific performance requirements and applications. Common standards include ASTM A335, A519, and A213, while grades like P5, P9, P11, P22, and P91 are frequently used within these standards.

Detailed Grades of Alloy Steel Pipes by Standard
Standard	Detailed Grades	Main Applications
ASTM A335 / ASME SA335	P1, P2, P5, P9, P11, P12, P15, P21, P22, P23, P24, P36, P91, P92, P122, P911	High-temperature pressure systems: power plants, refineries, and chemical plants
ASTM A213 / ASME SA213	T2, T5, T5b, T9, T11, T12, T17, T22, T23, T24, T91, T92, T122, T911	Boiler tubes, superheaters, and heat exchangers
ASTM A519	4130, 4135, 4140, 4145, 4150, 1020, 1026, 1330, 8620	Mechanical tubing, structural applications, automotive components
API 5L	A25, A, B, X42, X46, X52, X56, X60, X65, X70, X80, X100	Oil and gas transmission pipelines (onshore and offshore)
EN 10216‑2	13CrMo4-5, 10CrMo9-10, 12CrMo19-5, X10CrMoVNb9-1, X11CrMo5, 14MoV6-3, X20CrMoV12-1	European pressure vessels and high-temperature piping
GB / SH Standards	15CrMoG, 12Cr1MoVG, 10CrMo910, 12CrMo, 1Cr5Mo, WB36, 10Cr9Mo1VNb (equiv. T91)	Petrochemical, power generation, high-pressure boilers in Chinese systems

Alloy steel is made by combining carbon steel with one or several alloying elements, such as titanium, copper, chromium, aluminum, manganese, silicon, and nickel. This produces specific properties that are not found in standard carbon steel. Common alloy steel grades include 4130, 4140, 4340, and 8620 for their balance of characteristics like strength, toughness, machinability, and weldability.

Alloy steel pipes are made from carbon steel combined with alloying elements like chromium, molybdenum, nickel, or vanadium to improve strength, heat resistance, and corrosion performance—suitable for challenging industrial applications.

Common standards include ASTM A335/ASME SA335 (P1, P5, P9, P11, P22, P91, P92), ASTM A213 (T5, T9, T11, T22, T91), as well as EN 10216‑2 (e.g., 13CrMo4‑5).

They’re available as seamless, ERW, LSAW, SSAW, and CD pipes. Typical processes include hot or cold finishing, with precise control for pressure/temperature specifications.

Available diameters span 1/8″–42″ (OD ~6–1067 mm), wall thicknesses from schedule 20 to XXS or custom. Lengths include SRL, DRL, or fixed lengths up to 23m.

Surfaces may be epoxy-coated, varnished, oil-treated, galvanized, or shot-blasted. Inspection includes PMI, tensile, hardness, impact, flaring, flattening, hydrostatic, and NDT testing.

Widely used in power generation (boilers, superheaters), petrochemical plants, refineries, oil & gas pipelines, aerospace, and industrial machinery where heat, pressure, and corrosion demand superior performance.

Pipes are delivered in conditions such as cold-finished/hard (BK), cold-finished/soft (BKW), annealed (GBK), or normalized (NBK), with certificate and traceability of heat/furnace number.

Alloy steel pipes contain alloying elements that enhance their strength, hardness, and resistance to wear and corrosion. Carbon steel pipes, on the other hand, primarily consist of carbon and iron, making them more susceptible to corrosion and wear.

Selecting the right alloy steel pipe involves considering factors such as the operating temperature, pressure, corrosion environment, and mechanical stress. It's essential to consult with material experts and refer to relevant standards to ensure compatibility with your specific application.

Yes, alloy steel pipes are designed to withstand high temperatures and are commonly used in applications such as power plants, boilers, and heat exchangers, where elevated temperatures are prevalent.

Alloy Steel Pipe Industry Applications

Alloy steel pipes offer superior strength, temperature and corrosion resistance, making them ideal for demanding environments across energy, petrochemical, construction, and more.

Oil & Gas Industry

Used extensively in drilling, subsea and onshore pipelines for crude oil, natural gas, and refined products due to high strength and corrosion resistance.

Chemical & Petrochemical Plants

Ideal for transporting corrosive chemicals, high-pressure reactor feeds, and heat exchanger tubing where carbon steel fails.

Power & Utility Boilers

Used in high-temp boiler tubes, superheaters, reheaters, and steam piping; withstands extreme temperatures and pressures efficiently.

Construction & Infrastructure

Used as structural pipelines, piling tubes, and transport lines in high-rise buildings and bridges due to high structural strength.

Cryogenic & Low-Temperature Services

Suitable for transporting liquefied gases and cold media, where toughness and strength must endure sub-zero temperatures.

Energy & Environmental Efficiency

Alloy steel pipes are fully recyclable and support energy-efficient systems, aligning with green standards in modern industry.

Key Considerations

Service Conditions: Choose grade based on temperature, pressure, and fluid compatibility.
Fabrication & Welding: Follow proper heat treatment and filler materials to avoid cracking or weakening.
Inspection & Maintenance: Regular checks for corrosion, fatigue, wear — especially in high-stress environments.

ASTM A519 Carbon and Alloy Steel Mechanical Tubing

ASTM A519 AISI 4140 Tubes

ASTM A519 4130 Seamless Pipe

ASTM A519

ASTM A519 seamless carbon steel precision mechanical tubing

What are the grades of alloy steel?