ASMT A513-88/ASME SA513 electric resistance welded carbon and alloy steel mechanical tubing

SunnySteel Tubing produces round carbon and alloy electric resistance welded (ERW) mechanical tubing to ASTM specifications A513 Type1A (hot rolled), Type 1B (pickled & oiled) and Type 2 (cold rolled). Produced in sizes ranging from 1.05 inch OD up to 12.75 inch OD and in nominal wall thicknesses beginning at 18 gauge (0.049") and heavier, ASTM A513 tubing is used in a variety of industrial, agricultural, and transportation related end uses. For a complete listing of sizes produced, please visit our Steel Tubing Product Catalog.

ASTM A513 Type 1A & 1B

ASTM A513 Type 1A mechanical tubing is produced from hot rolled strip steel while A513 Type 1B tubing is produced from hot rolled strip steel that has been pickled to remove scale then oiled to provide a cleaner surface than hot rolled.

A513 Type 1 tubing provides more specific tolerances for OD, wall thickness, length and straightness tolerances than pipe and structural tubing specifications. It is often is used in applications where bending, flanging, flaring or flattening is required.

ASTM A513 Type 2

ASTM A513 Type 2 is produced from hot rolled strip steel that has been cold reduced. Due to the extra cold working at the steel mills, A513 Type 2 tubing will have tighter wall thickness tolerances, improved surface condition and a more narrow range of mechanical properties than A513 Type 1.

A513 Type 2 tubing is used in a variety of applications where surface condition is critical and where further polishing or plating of the tubing is required. The maximum wall thickness for cold rolled tubing is 0.120" nominal.

ASTM A513 electric resistance welded carbon and alloy steel mechanical tubing

Tubing produced to the A513 specification also provide improved ductility with its closely controlled carbon steel grades.


  1. This specification covers electric-resistance-welded carbon and alloy steel tubing for use as mechanical tubing.
  2. This specification covers mechanical tubing made from hot- or cld-rolled steel.
  3. This specification covers round, square, rectangular, and special shape tubing.
Size Range(Round Tubing)
Electric-Resistance-Welded Tubing from Hot-Rolled Steel outside diameter from 3/4 to 15 in.(19.0 to 38.1mm)
wall from 0.065 to 0.650 in.(1.65 to 16.50mm)
Electric-Resistance-Welded Tubing from cold-Rolled Steel outside diameter form 3/8 to 8 in.(9.52 to 203.2mm)
wall from 0.028 to 0.134 in.(0.71 to 3.40mm)
  1. Optional supplementary requirements are provided and when desired, shall be so stated in inch-pound units are to be refarded as the standard.
  2. The values stated in inch-pund units are to be regarded as the standard.
Chemical composition
Grade   Designation Composition.   %
Carbon Manganese Phosphorus.   max Sulfur,   max Silicon ...Nickel... Chromium Molybdenum
1008 0.10   max. 0.50   max 0.035 0.035 ... .... ... ...
1010 0.08-0.13 0.30-0.60 0.035 0.035 ... ... ... ...
1012 0.10-0.15 0.30-0.60 0.035 0.035 ... ... ... ...
1015 0.12-0.18 0.30-0.60 0.035 0.035 ... ... ... ...
1016 0.12-0.18 0.60-0.90 0.035 0.035 ... ... ... ...
1017 0.14-0.20 0.30-0.60 0.035 0.035 ... ... ... ...
1018 0.14-0.20 0.60-0.90 0.035 0.035 ... ... ... ...
1019 0.14-0.20 0.70-1.00 0.035 0.035 ... ... ... ...
1020 0.17-0.23 0.30-0.60 0.035 0.035 ... ... ... ...
1021 0.17-0.23 0.60-0.90 0.035 0.035 ... ... ... ...
1022 0.17-0.23 0.70-1.00 0.035 0.035 ... ... ... ...
1023 0.19-0.25 0.30-0.60 0.035 0.035 ... ... ... ...
1024 0.18-0.25 1.30-1.65 0.035 0.035 ... ... ... ...
1025 0.22-0.28 0.30-0.60 0.035 0.035 ... ... ... ...
1026 0.22-0.28 0.60-0.90 0.035 0.035 ... ... ... ...
1027 0.22-0.28 1.20-1.55 0.035 0.035 ... ... ... ...
1030 0.27-0.34 0.60-0.90 0.035 0.035 ... ... ... ...
1033 0.29-0.36 0.70-1.00 0.035 0.035 ... ... ... ...
1035 0.31-0.38 0.60-0.90 0.035 0.035 ... ... ... ...
1040 0.36-0.44 0.60-0.90 0.04 0.05 ... ... ... ...
1050 0.47-0.55 0.60-0.90 0.04 0.05 ... ... ... ...
1060 0.55-0.66 0.60-0.90 0.04 0.05 ... ... ... ...
1340 0.38-0.43 1.60-1.90 0.035 0.04 0.15-0.35 ... ... ...
1524 0.18-0.25 1.35-1.65 0.04 0.05 ... ... ... ...
4118 0.18-0.23 0.70-0.90 0.035 0.04 0.15-0.35 ... 0.40-0.60 0.08-0.15
4130 0.28-0.33 0.40-0.60 0.035 0.04 0.15-0.35 ... 0.80-1.10 0.15-0.25
4140 0.38-0.43 0.75-1.00 0.035 0.04 0.15-0.35 ... 0.80-1.10 0.15-0.25
5130 0.23-0.33 0.70-0.90 0.035 0.04 0.15-0.35 ... 0.80-1.10 ...
8820 0.18-0.23 0.70-0.90 0.035 0.04 0.15-0.35 0.40-0.70 0.40-0.60 0.15-0.25
8630 0.28-0.33 0.70-0.90 0.035 0.04 0.15-0.35 0.40-0.70 0.40-0.60 0.15-0.25

Mechanical Properties of ASTM A513:
Grade Tensil strength(Mpa) ≥ Yield strength(Mpa) ≥ Elongation% ≥ RB, ≥
ASTM A513 1010 379 310 12 68
ASTM A513 1020 448 379 10 75
ASTM A513 1026 517 448 10 80
ASTM A513 4130 621 552 10 87

Specification Notes

  • ASTM A513 covers carbon steel grades starting at 1008 and higher in addition to specified alloy steels. Please visit our Finishes & Chemistries page for a listing of our standard chemistry capabilities.
  • Physical testing (yield, tensile and elongation) is not required under A513. If there is a specific strength requirement for your application, please be sure to include at the time of inquiry as that will affect the chemistry required.
  • Flash control of the ID weld bead is discussed in section 12.3 to 12.3.4 of the specification. Valmont produces tubing to flash control 0.015" maximum, 0.010" maximum, 0.005" maximum and flash in.
  • Valmont does not produce tubing to meet ASTM A513 Type 3, 4, 5 and 6. Depending upon actual tolerances requested; however, Valmont's ability to produce tubing to tolerances tighter than A513 Type 1 and 2 allows us to explore options to replace ASTM A513 Type 5 DOM (drawn over mandrel) tubing. Please inquire with one of our knowledgeable salespeople if your needed tolerances lie between A513 Type 1 or 2 and A513 Type 5 so that we can explore alternatives to drawn over mandrel.
  • ASTM A787 is a related mechanical tubing specification that covers metallic coated (galvanized, hot-dip galvanized, aluminized and galvannealed) carbon steel tubing. Please refer to the ASTM 787 page for more information.

If a specific type of melting is required by the purchaser, it shall be as stated on the purchase order. The primary melting may incorporate separate degassing or refining, and may be followed by secondary melting, such as electroslag or vacuum-arc remelting. If secondary melting is employed, the heat shall be defined as all of the ingots remelted from a single primary heat. Steel may be cast in ingots or may be strand cast. When steel of different grades is sequentially strand cast, identification of the resultant transition material is required. The producer shall remove the transition material by an established procedure that positively separates the grades. Tubes shall be made by the electric-resistance-welded process and shall be made from hot- or cold-rolled steel as specified.

Chemical Composition

The steel shall conform to the requirements as to chemical composition. If no grade is specified, Grades MT 1010 to MT 1020 may be furnished.Analyses of steels other than those listed are available. To determine their availability, the purchaser should contact the producer. When a carbon steel grade is ordered under this specification, supplying an alloy grade that specifically requires the addition of any element other than those listed for the ordered grade permitted.

Heat Analysis

An analysis of each heat of steel shall be made by the steel manufacturer to determine the percentages of the elements specified; if secondary melting processes are employed, the heat analysis shall be obtained from one remelted ingot or the product of one remelted ingot of each primary melt. The heat analysis shall comform to the requirements specified, except that where the heat identity has not been maintained or where the analysis is not sufficiently complete to permit conformance to be determined, the chemical composition determined from a product analysis made by the tubular manufacturer shall conform to the requirements specified for heat analysis. When requested in the order or contract, a report of such analysis shall be furnished to the purchaser.

ASTM A500 vs ASTM A513

A common question that comes up when buying tubing is the difference between A500 and A513 material. Customers often assume the specifications are interchangeable but when we delve deeper into the specs, we see there are significant differences.

What is A500 tubing?

A500 tubing comes in many different names – for squares and rectangles, it is referred to as structural tubing, or HSS (or Hollow Structural Sections). Rounds are typically called out as Structural Pipe or pipe size tubes. A500 products are used in applications where loadbearing applications are required. Because of its aesthetic appeal, A500 often is used as a showcase for architectural marvels such the Rock & Roll Hall of Fame in Cleveland, OH. When you order A500 tubing from the mill, you are supplied with an MTR, or Material Test Report that not only shows the chemical composition of the steel coil used to manufacture the tube, but also the Yield, Tensile and Elongation properties. The reporting of physical properties is one of the major differences between A500 and A513 material.

What is A513 tubing?

A513, or mechanical tubing, is used in more consumer based applications that need tighter tolerances but are not concerned with the load-bearing properties of the material itself. A513 applications can include lawn-mower handles or parts used in recreational vehicles.

Key Differences

When you are ordering A500 or A513 material from Sunny Steel, here are some of the key differences of both specs:

Looser Dimensional Tolerances (ex: 2×2-.083, Corner Radius max is .249”)
Physical Requirements (Yield, Tensile, Elongation)
Stenciling (required for material with a 5” or larger side)
Tighter Dimensional Tolerances (ex: 2×2-.083, Corner Radius is 5/64” to .125”)
No Physical Requirements
No Stenciling required

A500 Grade A, B & C Tubing

Sunny Steel supply square, rectangle, round and special shaped electric resistance welded (ERW) carbon steel tubing to meet ASTM specifications A500 Grade A, Grade B and Grade C that is often used in structural applications. The purpose and strength levels required will determine which grade is required.

Square & Rectangle Tubing

Below are physical properties required to meet the three grades that we produce ASTM A500 square, rectangle and special shaped tubing to. A flattening test is not a standard requirement for non-round tubing produced to A500.

Grade Yield (min)  Tensile (min) 
Grade A  39,000 psi  45,000 psi 
Grade B  46,000 psi  58,000 psi 
Grade C  50,000 psi  62,000 psi 
Round Tubing

Below are physical properties required to meet the three grades that we produce ASTM A500 round tubing to. A flattening test is also a standard requirement for round tubing produced to the A500 specification.

Grade Yield (min) Tensile (min) 
Grade A  33,000 psi  45,000 psi 
Grade B  42,000 psi  58,000 psi
Grade C  46,000 psi  62,000 psi 

Specification Notes

  • According to ASTM A500, the weld seam location for square, rectangle and other special shaped tubing shall not be located within the corner radius unless specified by the customer or manufacturer.
  • Under ASTM A500, the corner radius for square and rectangular tubing shall not exceed three times the corner radius.
  • As a standard under ASTM A500, electric resistance welded tubing is normally provided without removal of inside flash. If flash control is required, please specify at time of quotation or order placement.
  • ASTM A847 is a related structural specification that covers high strength low alloy atmospheric corrosion resistant steel tubing. Please refer to the ASTM A847 page for more information.

Weled steel pipe specification, Standard and identification

Welded steel pipe (steel pipe manufactured with a weld) is a tubular product made out of flat plates, known as skelp, that are formed, bent and prepared for welding.


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