A513 ERW Steel Pipe
A513 ERW Steel Pipe is tubing produced to ASTM A513 / A513M as electric-resistance-welded carbon and alloy steel for mechanical, non-pressure service - it is not for pressure and not for fluid conveyance. It is supplied as Type 1 (hot-rolled ERW), Type 2 (cold-rolled ERW), or Type 5 DOM (drawn over a mandrel), in grades 1008 through 4130, across outside diameters from 9.9 mm to 381 mm. The single fact that decides correct use is that A513 carries no pressure rating - it is a dimensional and chemical specification, not a pressure-pipe specification.
A513 ERW Steel Pipe is the American standard for welded mechanical tubing, and the ERW route (electric resistance welded tubing) is the dominant production method the designation was written around. It is used where the tube is a component - machined, bent, plated, or assembled - rather than a conduit for pressurized media. Send your OD × wall, grade, and condition to request a quote.
Technical Specifications
| Parameter | Capability |
|---|---|
| Standard | ASTM A513 / A513M-24 (electric-resistance-welded carbon and alloy steel mechanical tubing) |
| Type / process | Type 1 (hot-rolled ERW), Type 2 (cold-rolled ERW), Type 5 DOM (drawn over mandrel) |
| Outside diameter | Type 1: 19.0–381.0 mm (0.5–15 in); Type 2: 9.92–304.8 mm (0.375–12 in) |
| Wall thickness | Type 1: 1.65–16.50 mm; Type 2: 0.71–3.40 mm |
| Wall tolerance | ±10 % of nominal wall (A513-1) |
| Length | Fixed 6 / 9 / 12 m, or cut-to-length by agreement (typical 1–12 m) |
| Shapes | Round, square, rectangular, and special sections |
| Surface / coating | Black (bare), oiled, pre-galvanized, hot-dip galvanized, primer-coated |
| Delivery condition | As-welded, normalized, stress-relieved, DOM (drawn over mandrel) |
| Certification | EN 10204 3.1 / 3.2 MTC; third-party inspection (SGS, BV, TÜV) available |
Chemical Composition
The A513 chemical composition limits below are the ladle-analysis maxima for the most commonly ordered carbon grades. The "MT" prefix (e.g., MT 1020) is the mechanical-tubing designation for the same chemistry. Each element controls a specific risk: carbon sets strength and weldability, manganese supports strength, and phosphorus/sulfur are kept low for weld soundness and formability.
| Grade | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) |
|---|---|---|---|---|
| 1008 | 0.10 max | 0.30–0.50 | 0.035 max | 0.035 max |
| 1010 | 0.05–0.15 | 0.30–0.60 | 0.035 max | 0.035 max |
| 1015 | 0.10–0.20 | 0.30–0.60 | 0.035 max | 0.035 max |
| 1020 | 0.15–0.25 | 0.30–0.60 | 0.035 max | 0.035 max |
| 1026 | 0.22–0.28 | 0.60–0.90 | 0.035 max | 0.035 max |
Mechanical Properties
The A513 mechanical properties are not fixed minimums in the standard - they vary with the grade and condition ordered. The representative values below are typical As-Welded and DOM figures and must be confirmed against the actual ordered grade and thermal condition before design use.
| Grade / condition | Yield strength | Tensile strength | Elongation (2 in / 50 mm) |
|---|---|---|---|
| 1010, As-Welded | 221 MPa (32 ksi) | 310 MPa (45 ksi) | 15 % |
| 1020, As-Welded | 262 MPa (38 ksi) | 359 MPa (52 ksi) | 12 % |
| 1026, As-Welded | 310 MPa (45 ksi) | 427 MPa (62 ksi) | 12 % |
| 1020, DOM (Type 5) | 414 MPa (60 ksi) | 483 MPa (70 ksi) | 10 % |
| 1026, DOM (Type 5) | 483 MPa (70 ksi) | 552 MPa (80 ksi) | 10 % |
Because the standard does not mandate a single strength value, a design that depends on a guaranteed yield must either select a condition with a confirmed value or move to a structural specification such as A500.
Type 1 vs Type 2 vs Type 5 (DOM)
| Type | Process | Size suitability | When to specify |
|---|---|---|---|
| Type 1 | As-welded, hot-rolled strip | OD 19–381 mm, wall 1.65–16.50 mm | Economy, larger sizes, finish not critical |
| Type 2 | As-welded, cold-rolled strip | OD 9.9–305 mm, wall 0.71–3.40 mm | Precision, thinner wall, better surface |
| Type 5 (DOM) | ERW drawn over a mandrel | Within the ERW envelope, tighter ID/OD | Smooth bore, tight tolerance, higher properties |
All three begin as ERW tubing; DOM (Type 5) simply adds a cold-drawing step that removes the internal weld bead and tightens dimensions. The route decision is therefore about finish and tolerance, not about seam integrity.
A513 vs A500 vs A53
| Requirement | ASTM A513 | ASTM A500 | ASTM A53 |
|---|---|---|---|
| Primary purpose | Mechanical tubing (components) | Structural HSS (load-bearing) | Pressure / fluid pipe |
| What it certifies | Chemistry and dimensions | Minimum yield and tensile | Hydrostatic rating |
| Pressure rated | No | No | Yes |
| Grade range | 1008–4130 (wide) | A, B, C, D (fixed) | A, B (fixed) |
| Tolerance | Tight (precision) | Moderate (structural) | Moderate |
| Typical use | Automotive, furniture, machinery | Columns, bridges, frames | Plumbing, low-pressure lines |
If the drawing calls out a minimum yield strength, HSS dimensions, or a structural application, order A500. If the part is machined, plated, or precision-fit, order A513. If the media is pressurized, neither mechanical nor structural tubing applies - specify A53 or A106.
Quality Control and Testing
Dimensional Inspection-Outer diameter, wall thickness, length, and straightness are verified in accordance with A513 standard requirements.
Weld Verification-Weld integrity is confirmed per mill procedures; non-destructive testing (NDT) can be performed if specified.
Chemical Composition Confirmation-Ladle analysis reports comply with EN 10204 3.1 / 3.2 MTC standards.
Mechanical Property Verification (Subject to mutual agreement)-Tensile strength and hardness data are provided if the steel condition (e.g., DOM) has established values; this is not a mandatory requirement under the A513 standard.
Third-Party Inspection-Inspection reports from SGS, BV, or TÜV are available upon request.
Why Source A513 Tubing from GNEE
Integrated supply. GNEE works with ERW and DOM mills and can match the grade, type, and condition to the part rather than pushing a single stock line.
Specification discipline. Every quote states the A513 revision, grade, type, and condition explicitly - no seamless mislabels, no EN delivery codes, no pressure claims.
Documentation. EN 10204 3.1 / 3.2 MTC and third-party inspection (SGS, BV, TÜV) are available; more than 160 customers across export markets have been served.
Response. Technical review and a quoted lead time are returned within 24 hours of a complete inquiry.
FAQ
Is A513 tubing seamless?
No. ASTM A513 covers only electric-resistance-welded tubing; it does not include seamless tubing. If you need a seamless mechanical tube, specify ASTM A519 instead.
Can A513 ERW pipe be used for pressure or fluid conveyance?
No. A513 is mechanical tubing intended for non-pressure applications. It is not hydrostatically rated and must not be used to convey fluids under pressure. For pressurized or fluid service, specify ASTM A53 or ASTM A106.
What is the difference between A513 Type 1, Type 2, and Type 5?
Type 1 is as-welded from hot-rolled strip - economy grade for larger sizes and less critical finish. Type 2 is as-welded from cold-rolled strip - tighter wall tolerance, thinner wall, better surface. Type 5 (DOM) is ERW tube cold-drawn over a mandrel for smooth ID/OD, tighter dimensions, and higher properties.
How do I choose between A513 and A500?
Use A500 when the design depends on certified minimum yield and tensile strength - structural HSS, load-bearing columns and frames. Use A513 when the part depends on tight dimensional tolerance, surface finish, or machining and plating - components and OEM assemblies. A500 certifies strength; A513 certifies precision. They are not interchangeable where load is calculated.
Does A513 specify minimum mechanical properties?
No. A513 controls chemistry and dimensions, not mandatory mechanical minimums. Strength depends on the grade (1008 through 1026, 4130, 4140, etc.) and the condition (as-welded, normalized, stress-relieved, DOM). The values in this page's table are representative only and must be confirmed against the ordered grade and condition.
What are the common A513 grades?
Low-carbon grades 1008, 1010, 1015, 1020 and 1026 are the most common for formability and weldability. Alloy grades such as 4130 and 4140 are selected when higher strength or heat-treatability is required.
What is the A513 equivalent in Europe or Japan?
The nearest European counterparts for precision welded mechanical tubing are EN 10305-2 and EN 10305-3; JIS G3445 covers carbon steel tubes for machine structural purposes. These are similar in intent but differ in scope and are not a 1:1 substitution without design review.
What sizes does A513 ERW tubing cover?
Type 1 (hot-rolled ERW) spans outside diameter 19.0–381.0 mm (0.5–15 in) and wall 1.65–16.50 mm. Type 2 (cold-rolled ERW) spans OD 9.92–304.8 mm (0.375–12 in) and wall 0.71–3.40 mm. Outside those envelopes the section is no longer within A513's ERW range.
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