ASTM A519 Seamless Mechanical Tubing

March 9, 2026

ASTM A519 Seamless Mechanical Tubing

ASTM A519/A519M is the standard specification for seamless carbon and alloy steel mechanical tubing, covering hot‑finished and cold‑finished products for mechanical, structural, and pressure applications. It defines strict chemical composition, mechanical properties, manufacturing, and testing requirements for round, square, rectangular, and special‑section tubes up to 12 3⁄4 in. (325 mm) OD.

1. Standard Overview

Scope: Seamless carbon/alloy steel mechanical tubing (hot‑finished/cold‑finished) for mechanical engineering, pressure service, automotive, machinery, and structural components.
Manufacturing: Produced via hot working (piercing/rolling) with optional cold finishing for tight dimensional control and enhanced properties.
Testing: Mandatory tension, flattening, flaring, hardness, hydrostatic/nondestructive electric tests.
Key Grades: Low‑carbon (1010, 1020), medium/high‑carbon (1045), alloy (4130, 4140),

2. 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	0.15–0.35	—	—
1045	0.43–0.50	0.60–0.90	0.040	0.050	0.10–0.35	—	—
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	0.15–0.35

3. Mechanical Properties (Minimum Values)

Grade	Condition	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HB, max)
1020	Annealed (A)	331	193	30	143
1020	Normalized (N)	379	234	22	156
1020	Cold‑drawn (CW)	483	414	5	197
1045	Normalized	586	345	15	217
4130	Quenched & Tempered	621	483	18	241
4140	Quenched & Tempered	855	689	10	285

4. Key Features & Applications

Precision: Tight dimensional tolerances (OD, ID, wall thickness) for mechanical assemblies.
Strength: Balanced strength‑ductility; alloy grades offer high fatigue/toughness.
Versatility: Hot‑finished (cost‑effective) or cold‑finished (precision) options
Applications: Automotive shafts, hydraulic cylinders, machine components, structural parts, pressure vessels.

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ASTM A519 Seamless Mechanical Tubing