ASTM A513 Type 5 DOM Round Steel Tube Cold-Worked Carbon Steel
ASTM A513 Type 5 DOM Round Steel Tube — Cold-Worked Carbon Steel Welded Mechanical Tubing
Material
Drawn Over Mandrel (DOM) round mechanical tubing manufactured to ASTM A513 Type 5. It begins as ERW tubing and is then cold-drawn through a mandrel and die to refine the grain, improve surface finish, increase strength, and deliver very tight OD/ID concentricity and wall tolerances. Typical melt chemistries used are SAE/AISI 1020 and 1026 low-carbon steels.
Specifications
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Manufacturing route: ERW → DOM cold drawing; available “as drawn (+C)” or stress-relieved/annealed (SRA).
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Common grades: 1020 / 1026.
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Size range (typical): OD 9.52–203.2 mm (⅜–8″); many suppliers list up to 12″ OD and heavy walls.
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Straightness (typical): 0.030 in per 3 ft (0.76 mm/m) ≤ 8.00″ OD; 0.060 in per 3 ft for ≥ 8.00″ OD.
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Wall tolerance: tight plus/minus controls per A513 tables (±0.002–0.004 in typical, depending on OD/wall).
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Surface & geometry: smooth OD/ID, excellent concentricity, uniform wall.
Chemical Composition
| Grade / Standard | C | Si | Mn | P | S | Al |
|---|---|---|---|---|---|---|
| SAE/AISI 1020 | 0.17–0.23 | — | 0.30–0.60 | ≤0.035 | ≤0.035 | — |
| SAE/AISI 1026 | 0.22–0.28 | — | 0.60–0.90 | ≤0.015 | ≤0.005 | — |
| EN 10305-2 E235 (1.0308) | ≤0.17 | ≤0.35 | ≤1.20 | ≤0.025 | ≤0.025 | ≥0.015 |
| EN 10305-2 E355 (1.0580) | ≤0.22 | ≤0.55 | ≤1.60 | ≤0.025 | ≤0.025 | ≥0.020 |
| JIS G3445 STKM13C | ≤0.25 | ≤0.35 | 0.30–0.90 | ≤0.04 | ≤0.04 | — |
Mechanical Properties
| Grade / Standard | Delivery condition | Tensile (MPa) | Yield (MPa) | Elongation (%) | Notes |
|---|---|---|---|---|---|
| ASTM A513 Type 5 DOM (typical) | SRA / cold-worked | ≈483 | ≈414 | 15–20 | Typical DOM values; hardness ≈HRB 80. |
| EN 10305-2 E235 | +C (cold-drawn/hard) | 520 | 470 | 10 | Minimums per EN for welded cold-drawn precision tube. |
| EN 10305-2 E355 | +C (cold-drawn/hard) | ≥640 | ≈540 | ≥4 | Typical minima for E355 +C. |
| JIS G3445 STKM13C | Bright-annealed | ≈635 | ≈565 | ≈16 | Producer QA data for STKM13C tubing. |
| SAE/AISI 1020 (reference) | Cold-drawn / annealed | ≈420 | ≈350 | ≈15 | Reference properties for 1020 low-carbon steel. |
Key Characteristics
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Tight OD/ID concentricity and uniform wall for precision fit-ups and machining.
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Higher strength than as-welded ERW due to cold work; consistent hardness and microstructure.
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Excellent machinability and weldability (low-carbon 1020/1026 chemistries).
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Clean, smooth surfaces; straightness suitable for high-speed assembly.
Applicable Standards
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ASTM: ASTM A513 Type 5 — ERW DOM mechanical tubing.
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EN: EN 10305-2 — Welded cold-drawn precision steel tubes (grades E235/E355).
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JIS: JIS G3445 — Carbon steel tubes for machine structural purposes (e.g., STKM13C).
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GB (China): GB/T 31315-2014 — Cold-drawn/cold-rolled precision welded steel tubes for mechanical structures.
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GOST (Russia): GOST 10704 / 10705 — Electrically welded longitudinal steel pipes (general/structural use).
Applications
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Automotive: suspension links, steering columns, driveshaft components, roll-cage members.
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Hydraulics & pneumatics: cylinder barrels, shock/strut bodies (after honing, where specified).
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General machinery & fabrication: jigs/fixtures, conveyors, frames, agricultural implements, furniture tubing.
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