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Compare over 50 grades of steel and cast iron to find the right material for you—all with material certificates for traceability.
Multipurpose Low-Carbon Steel Round Tubes
 |
Also known as mild steel, low-carbon steel is easy to machine, form, and weld. It's widely fabricated into parts that don’t require high strength, such as frames, supports, and conduit.
Seamless—Seamless tubes are stronger than welded tubes.
Heat Treatable—Heat treatable tubes can be surface hardened.
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Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
OD | ID | Fabrication | Mechanical Tube Type | Heat Treatable | Yield Strength, psi | Hardness | Specs. Met | 1/2 ft. Long | 1 ft. Long | 2 ft. Long | 3 ft. Long | 4 ft. Long | 6 ft. Long | 8 ft. Long | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0.035" Thick Wall | |||||||||||||||||
| 5/8" | 0.555" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 2 | 6045N216 | — | — | — | — | — | 00000 | — | ||
| 3/4" | 0.68" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 2 | 6045N217 | — | — | — | — | — | 00000 | — | ||
| 7/8" | 0.805" | Welded | ERW | No | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 2 | 6045N511 | — | — | — | — | — | 00000 | — | ||
| 1" | 0.93" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 2 | 6045N218 | — | — | — | — | — | 00000 | — | ||
| 2" | 1.93" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 2 | 6045N221 | — | — | — | — | — | 00000 | — | ||
0.049" Thick Wall | |||||||||||||||||
| 2 1/2" | 2.402" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 2 | 6045N61 | — | — | — | 000000 | — | 00000 | — | ||
0.065" Thick Wall | |||||||||||||||||
| 1 1/8" | 0.995" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 2 | 6045N241 | — | — | — | — | — | 00000 | — | ||
| 1 3/8" | 1.245" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N62 | — | — | — | 00000 | — | 00000 | — | ||
| 1 3/4" | 1.62" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N63 | — | — | — | 00000 | — | 00000 | — | ||
| 2 1/4" | 2.12" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N64 | — | 000000 | — | 00000 | — | 00000 | — | ||
| 2 1/2" | 2.37" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N65 | — | 00000 | — | 00000 | — | 00000 | — | ||
| 2 3/4" | 2.62" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N66 | — | 00000 | — | 00000 | — | 00000 | — | ||
| 3 1/4" | 3.12" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N67 | — | 00000 | — | 00000 | — | 00000 | — | ||
| 5" | 4.87" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N69 | — | 00000 | — | 00000 | — | 00000 | — | ||
| 6" | 5.87" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N71 | — | 00000 | — | 00000 | — | 00000 | — | ||
0.083" Thick Wall | |||||||||||||||||
| 1 1/2" | 1.334" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N73 | — | — | — | 00000 | — | 00000 | — | ||
| 3" | 2.834" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N75 | — | — | — | 00000 | — | 00000 | — | ||
0.095" Thick Wall | |||||||||||||||||
| 1 1/4" | 1.06" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N77 | — | — | — | 00000 | — | 00000 | — | ||
| 1 1/2" | 1.31" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N78 | — | — | — | 00000 | — | 00000 | — | ||
| 2" | 1.81" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N79 | — | 00000 | — | 00000 | — | 00000 | — | ||
0.12" Thick Wall | |||||||||||||||||
| 1 3/8" | 1.135" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N84 | — | 00000 | — | 00000 | — | 00000 | — | ||
| 1 5/8" | 1.385" | Welded | ERW | Yes | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N85 | — | 00000 | — | 00000 | — | 00000 | — | ||
1/8" Thick Wall | |||||||||||||||||
| 3/4" | 1/2" | Welded | ERW | No | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N18 | — | — | — | 00000 | — | 00000 | — | ||
| 1" | 3/4" | Welded | ERW | No | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 7767T315 | — | — | — | 00000 | — | 00000 | — | ||
| 1 1/4" | 1" | Welded | ERW | No | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N19 | — | — | — | 00000 | — | 00000 | — | ||
| 1 1/2" | 1 1/4" | Welded | ERW | No | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 7767T297 | — | — | — | 00000 | — | 00000 | — | ||
| 1 3/4" | 1 1/2" | Welded | ERW | No | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N21 | — | — | — | 00000 | — | 00000 | — | ||
| 2" | 1 3/4" | Welded | ERW | No | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 7767T316 | — | 00000 | — | 00000 | — | 00000 | — | ||
| 3" | 2 3/4" | Welded | ERW | No | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N22 | — | 00000 | — | 00000 | — | 00000 | — | ||
| 4" | 3 3/4" | Welded | ERW | No | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N23 | — | 00000 | — | 00000 | — | 000000 | — | ||
1/4" Thick Wall | |||||||||||||||||
| 8" | 7 1/2" | Welded | ERW | No | 32,000 | Rockwell B55 (Soft) | ASTM A513 Type 1 | 6045N46 | 000000 | 000000 | — | 000000 | — | — | — | ||
1 mm Thick Wall | |||||||||||||||||
| 12 mm | 10 mm | Seamless | — | No | 34,000 | Brinell 100 (Soft) | EN 10305-1 | 6045N11 | — | 00000 | 000000 | 00000 | — | 00000 | — | ||
2 mm Thick Wall | |||||||||||||||||
| 12 mm | 8 mm | Seamless | — | No | 34,000 | Brinell 100 (Soft) | EN 10305-1 | 6045N123 | — | 00000 | 00000 | 00000 | 000000 | 00000 | 000000 | ||
| 20 mm | 16 mm | Seamless | — | No | 34,000 | Brinell 100 (Soft) | EN 10305-1 | 6045N13 | — | 00000 | — | 00000 | — | 00000 | — | ||
3 mm Thick Wall | |||||||||||||||||
| 20 mm | 14 mm | Seamless | — | No | 34,000 | Brinell 100 (Soft) | EN 10305-1 | 6045N143 | — | 00000 | — | 00000 | — | 000000 | — | ||
| 25 mm | 19 mm | Seamless | — | No | 34,000 | Brinell 100 (Soft) | EN 10305-1 | 6045N15 | — | 00000 | — | 00000 | — | 00000 | — | ||
4 mm Thick Wall | |||||||||||||||||
| 25 mm | 17 mm | Seamless | — | No | 34,000 | Brinell 100 (Soft) | EN 10305-1 | 6045N163 | — | 00000 | — | 00000 | — | 000000 | — | ||
| 30 mm | 22 mm | Seamless | — | No | 34,000 | Brinell 100 (Soft) | EN 10305-1 | 6045N17 | — | 00000 | — | 000000 | — | 000000 | — | ||
Multipurpose Low-Carbon Steel Rectangular Tubes
 |
Also known as mild steel, low-carbon steel is easy to machine, form, and weld. These tubes are often fabricated into parts that don’t require high strength, such as frames, supports, and raceways. To increase their wear resistance, you can surface harden them with heat treating.
Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
Outside | Inside | Corner Shape | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ht. | Wd. | Ht. | Wd. | Inside | Outside | Fabrication | Mechanical Tube Type | Yield Strength | Hardness | Max. Hardness After Heat Treatment | Specs. Met | 1 ft. Long | 2 ft. Long | 3 ft. Long | 4 ft. Long | 6 ft. Long | 8 ft. Long | |||
0.035" Thick Wall | ||||||||||||||||||||
| 1/2" | 1/2" | 0.43" | 0.43" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 2 | 6527K296 | — | — | — | — | 00000 | — | ||
0.065" Thick Wall | ||||||||||||||||||||
| 1 1/2" | 1 1/2" | 1.37" | 1.37" | Round | Round | Welded | ERW | 32,000 psi | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K57 | 000000 | 000000 | 000000 | 000000 | 00000 | 000000 | ||
1 mm Thick Wall | ||||||||||||||||||||
| 12 mm | 12 mm | 10 mm | 10 mm | Round | Round | Welded | ERW | 34,000 psi | Rockwell B65 (Medium) | Not Rated | EN 10305-5 | 6527K71 | 0000 | — | 00000 | — | 00000 | — | ||
2 mm Thick Wall | ||||||||||||||||||||
| 25 mm | 25 mm | 21 mm | 21 mm | Round | Round | Welded | ERW | 34,000 psi | Rockwell B65 (Medium) | Not Rated | EN 10305-5 | 6527K72 | 00000 | — | 00000 | — | 00000 | — | ||
| 25 mm | 50 mm | 21 mm | 46 mm | Round | Round | Welded | ERW | 34,000 psi | Rockwell B65 (Medium) | Not Rated | EN 10305-5 | 6527K73 | 00000 | — | 00000 | — | 000000 | — | ||
| 40 mm | 40 mm | 36 mm | 36 mm | Round | Round | Welded | ERW | 34,000 psi | Rockwell B65 (Medium) | Not Rated | EN 10305-5 | 6527K74 | 00000 | — | 00000 | — | 000000 | — | ||
| 55 mm | 55 mm | 51 mm | 51 mm | Round | Round | Welded | ERW | 34,000 psi | Rockwell B65 (Medium) | Not Rated | EN 10305-5 | 6527K75 | 00000 | — | 00000 | — | 000000 | — | ||
3 mm Thick Wall | ||||||||||||||||||||
| 100 mm | 100 mm | 94 mm | 94 mm | Round | Round | Welded | ERW | 34,000 psi | Rockwell B65 (Medium) | Not Rated | EN 10305-5 | 6527K76 | 000000 | — | 000000 | — | 000000 | — | ||
