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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 Rectangular Tubes
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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.
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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, psi | Hardness | Max. Hardness After Heat Treatment | Specs. Met | 1/2 ft. Long | 1 ft. Long | 2 ft. Long | 3 ft. Long | 4 ft. Long | 6 ft. Long | 8 ft. Long | 12 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 | — | — | ||
0.049" Thick Wall | ||||||||||||||||||||||
| 1/2" | 1/2" | 0.402" | 0.402" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 2 | 6527K81 | — | — | — | 00000 | 00000 | 0000 | 000000 | — | ||
| 5/8" | 5/8" | 0.527" | 0.527" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 2 | 6527K82 | — | — | — | 0000 | — | 0000 | 00000 | — | ||
| 3/4" | 3/4" | 0.652" | 0.652" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 2 | 6527K83 | — | — | — | 0000 | 0000 | 00000 | 00000 | — | ||
1/16" Thick Wall | ||||||||||||||||||||||
| 1/2" | 1/2" | 3/8" | 3/8" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K34 | — | — | — | 0000 | — | 0000 | — | — | ||
| 1/2" | 1" | 3/8" | 7/8" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K35 | — | — | — | 00000 | — | 00000 | — | — | ||
| 3/4" | 3/4" | 5/8" | 5/8" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K39 | — | — | — | 00000 | — | 00000 | — | — | ||
| 1" | 1" | 7/8" | 7/8" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K65 | — | — | — | 00000 | — | 00000 | — | — | ||
| 1" | 2" | 7/8" | 1 7/8" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K66 | — | — | — | 00000 | — | 00000 | — | — | ||
| 1 1/4" | 1 1/4" | 1 1/8" | 1 1/8" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K67 | — | 000000 | — | 00000 | — | 00000 | — | — | ||
| 1 1/2" | 1 1/2" | 1 3/8" | 1 3/8" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K68 | — | — | — | 00000 | — | 00000 | — | — | ||
| 1 3/4" | 1 3/4" | 1 5/8" | 1 5/8" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K69 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 2" | 2" | 1 7/8" | 1 7/8" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K77 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
0.065" Thick Wall | ||||||||||||||||||||||
| 1/2" | 1/2" | 0.37" | 0.37" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K154 | — | 0000 | 00000 | 0000 | 0000 | 00000 | 00000 | — | ||
| 1/2" | 1" | 0.37" | 0.87" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K84 | — | — | — | 0000 | 0000 | 00000 | 00000 | — | ||
| 1/2" | 1 1/2" | 0.37" | 1.37" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K58 | — | 00000 | — | 00000 | — | 00000 | 00000 | — | ||
| 5/8" | 5/8" | 0.495" | 0.495" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 | 6527K85 | — | — | — | 0000 | 0000 | 00000 | 00000 | — | ||
| 3/4" | 3/4" | 0.62" | 0.62" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K164 | — | 0000 | — | 0000 | 00000 | 00000 | 00000 | — | ||
| 3/4" | 1 1/2" | 0.62" | 1.37" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K78 | — | — | — | 00000 | — | 00000 | — | — | ||
| 1" | 1" | 0.87" | 0.87" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K174 | — | 0000 | 0000 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 1" | 1 1/2" | 0.87" | 1.37" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K86 | — | 0000 | — | 00000 | — | 00000 | 00000 | — | ||
| 1" | 2" | 0.87" | 1.87" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K87 | — | 0000 | — | 00000 | 00000 | 00000 | 00000 | — | ||
| 1" | 3" | 0.87" | 2.87" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K88 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 1 1/4" | 1 1/4" | 1.12" | 1.12" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K184 | — | 0000 | 00000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 1 1/2" | 1 1/2" | 1.37" | 1.37" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K57 | — | 00000 | 00000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 2" | 2" | 1.87" | 1.87" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K89 | — | 00000 | — | 00000 | 00000 | 00000 | 00000 | — | ||
| 2 1/2" | 2 1/2" | 2.37" | 2.37" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K79 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
0.083" Thick Wall | ||||||||||||||||||||||
| 3/4" | 3/4" | 0.584" | 0.584" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K254 | — | 0000 | — | 0000 | 00000 | 00000 | 00000 | — | ||
| 3/4" | 1 1/2" | 0.584" | 1.334" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K9 | — | 0000 | — | 00000 | 00000 | 00000 | 00000 | — | ||
| 1" | 1" | 0.834" | 0.834" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K264 | — | 0000 | 00000 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 1" | 1 1/2" | 0.834" | 1.334" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K91 | — | 0000 | — | 00000 | — | 00000 | 00000 | — | ||
| 1" | 2" | 0.834" | 1.834" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K92 | — | 0000 | — | 00000 | 00000 | 00000 | 00000 | — | ||
| 1" | 3" | 0.834" | 2.834" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K93 | — | 00000 | — | 00000 | — | 00000 | 00000 | — | ||
| 1 1/4" | 1 1/4" | 1.084" | 1.084" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K94 | — | 0000 | 00000 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 1 1/2" | 1 1/2" | 1.334" | 1.334" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K274 | — | 00000 | — | 00000 | 00000 | 00000 | 00000 | — | ||
| 2" | 2" | 1.834" | 1.834" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K284 | — | 00000 | 00000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 2" | 4" | 1.834" | 3.834" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K95 | — | 00000 | — | 00000 | 00000 | 00000 | 00000 | — | ||
| 2 1/2" | 2 1/2" | 2.334" | 2.334" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K96 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
0.12" Thick Wall | ||||||||||||||||||||||
| 3/4" | 3/4" | 0.51" | 0.51" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K97 | — | 0000 | 0000 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 3/4" | 1 1/2" | 0.51" | 1.26" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K101 | — | — | — | 00000 | — | 00000 | — | — | ||
| 1" | 1" | 0.76" | 0.76" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K364 | — | 0000 | 00000 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 1" | 1 1/2" | 0.76" | 1.26" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K98 | — | 0000 | — | 00000 | 00000 | 00000 | 00000 | — | ||
| 1" | 2" | 0.76" | 1.76" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K99 | — | 00000 | 00000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 1" | 3" | 0.76" | 2.76" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K19 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 1 1/4" | 1 1/4" | 1.01" | 1.01" | Round | Round | Welded | ERW | Not Rated | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K45 | — | 00000 | 00000 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 1 1/2" | 1 1/2" | 1.26" | 1.26" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K374 | — | 00000 | 00000 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 1 1/2" | 2 1/2" | 1.26" | 2.26" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K59 | — | 00000 | — | 00000 | 00000 | 00000 | 000000 | — | ||
| 1 1/2" | 3" | 1.26" | 2.76" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K409 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 2" | 2" | 1.76" | 1.76" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K384 | — | 00000 | 00000 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 2" | 3" | 1.76" | 2.76" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K609 | — | 00000 | — | 00000 | — | 000000 | — | — | ||
| 2" | 4" | 1.76" | 3.76" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K709 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 2" | 6" | 1.76" | 5.76" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K809 | — | 00000 | — | 00000 | — | 000000 | — | — | ||
| 2 1/2" | 2 1/2" | 2.26" | 2.26" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K509 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 3" | 3" | 2.76" | 2.76" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K209 | — | 00000 | — | 00000 | — | 000000 | — | — | ||
| 4" | 4" | 3.76" | 3.76" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K309 | — | 00000 | — | 00000 | — | 000000 | — | — | ||
1/8" Thick Wall | ||||||||||||||||||||||
| 3/4" | 1 1/2" | 1/2" | 1 1/4" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K115 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 1" | 1 1/2" | 3/4" | 1 1/4" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K125 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 1" | 2" | 3/4" | 1 3/4" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K527 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 1" | 3" | 3/4" | 2 3/4" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A500 | 6527K46 | — | 00000 | — | 00000 | 00000 | 00000 | 00000 | — | ||
| 1 1/4" | 1 1/4" | 1" | 1" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K135 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 1 1/2" | 1 1/2" | 1 1/4" | 1 1/4" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K566 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 1 1/2" | 2" | 1 1/4" | 1 3/4" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K145 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 1 1/2" | 2 1/2" | 1 1/4" | 2 1/4" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K502 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 1 1/2" | 3" | 1 1/4" | 2 3/4" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K47 | — | 00000 | — | 00000 | 00000 | 00000 | 00000 | — | ||
| 1 3/4" | 1 3/4" | 1 1/2" | 1 1/2" | Round | Round | Welded | ERW | 32,000 | Not Rated | Not Rated | ASTM A513 Type 1 | 6527K215 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 2" | 2" | 1 3/4" | 1 3/4" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K914 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 2" | 3" | 1 3/4" | 2 3/4" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K934 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 2" | 4" | 1 3/4" | 3 3/4" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K225 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 2" | 5" | 1 3/4" | 4 3/4" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K235 | — | 00000 | — | 00000 | — | 000000 | — | — | ||
| 2" | 6" | 1 3/4" | 5 3/4" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K245 | — | 00000 | — | 00000 | — | 000000 | — | — | ||
| 2 1/2" | 2 1/2" | 2 1/4" | 2 1/4" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K414 | 000000 | 00000 | 00000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 3" | 3" | 2 3/4" | 2 3/4" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K424 | 00000 | 00000 | 00000 | 00000 | 00000 | 00000 | 000000 | — | ||
| 3" | 4" | 2 3/4" | 3 3/4" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K315 | — | 00000 | — | 00000 | — | 000000 | — | — | ||
| 3 1/2" | 3 1/2" | 3 1/4" | 3 1/4" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K434 | 00000 | 00000 | 00000 | 00000 | 00000 | 000000 | 000000 | — | ||
| 4" | 4" | 3 3/4" | 3 3/4" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K444 | 00000 | 00000 | 00000 | 00000 | 00000 | 000000 | 000000 | — | ||
0.188" Thick Wall | ||||||||||||||||||||||
| 1 1/4" | 1 1/4" | 0.874" | 0.874" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K48 | 00000 | 00000 | 00000 | 00000 | 00000 | 00000 | 000000 | — | ||
| 1 1/2" | 1 1/2" | 1.124" | 1.124" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K212 | — | 00000 | — | 00000 | — | 00000 | — | — | ||
| 1 1/2" | 3" | 1.124" | 2.624" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K49 | — | 00000 | — | 00000 | 00000 | 00000 | 000000 | — | ||
| 2" | 2" | 1.624" | 1.624" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K514 | — | 00000 | 00000 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 2" | 4" | 1.624" | 3.624" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K707 | — | 00000 | — | 00000 | — | 000000 | — | — | ||
| 2" | 6" | 1.624" | 5.624" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K325 | — | 00000 | — | 000000 | — | 000000 | — | — | ||
| 2 1/2" | 2 1/2" | 2.124" | 2.124" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K54 | — | 00000 | 00000 | 00000 | 00000 | 000000 | 000000 | — | ||
| 3" | 3" | 2.624" | 2.624" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K524 | — | 00000 | — | 00000 | 00000 | 000000 | 000000 | — | ||
| 3" | 4" | 2.624" | 3.624" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K616 | — | 00000 | — | 00000 | — | 000000 | — | — | ||
| 3" | 6" | 2.624" | 5.624" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K335 | — | 00000 | — | 000000 | — | 000000 | — | — | ||
| 4" | 4" | 3.624" | 3.624" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K534 | 00000 | 00000 | — | 000000 | 000000 | 000000 | 000000 | — | ||
| 4" | 6" | 3.624" | 5.624" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K109 | — | 00000 | — | 000000 | — | 000000 | — | — | ||
| 5" | 5" | 4.624" | 4.624" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K702 | — | 00000 | — | 000000 | — | 000000 | — | — | ||
| 6" | 6" | 5.624" | 5.624" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K704 | — | 00000 | — | 000000 | — | 000000 | — | — | ||
1/4" Thick Wall | ||||||||||||||||||||||
| 1 1/2" | 1 1/2" | 1" | 1" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K292 | — | 00000 | — | 00000 | — | 000000 | — | — | ||
| 1 1/2" | 3" | 1" | 2 1/2" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K55 | 00000 | 00000 | 00000 | 00000 | 00000 | 000000 | 000000 | — | ||
| 2" | 2" | 1 1/2" | 1 1/2" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K614 | — | 00000 | 00000 | 00000 | 00000 | 00000 | 000000 | 000000 | ||
| 2" | 3" | 1 1/2" | 2 1/2" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K708 | — | 00000 | — | 00000 | — | 000000 | — | — | ||
| 2" | 4" | 1 1/2" | 3 1/2" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K719 | — | 00000 | — | 00000 | — | 000000 | — | — | ||
| 2" | 6" | 1 1/2" | 5 1/2" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K807 | — | 00000 | — | 000000 | — | 000000 | — | — | ||
| 2" | 8" | 1 1/2" | 7 1/2" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K312 | — | 000000 | — | 000000 | — | 000000 | — | — | ||
| 2 1/2" | 2 1/2" | 2" | 2" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K56 | 00000 | 00000 | 00000 | 00000 | 000000 | 000000 | 000000 | 000000 | ||
| 3" | 3" | 2 1/2" | 2 1/2" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K624 | 00000 | 00000 | 00000 | 000000 | 000000 | 000000 | 000000 | 000000 | ||
| 3" | 4" | 2 1/2" | 3 1/2" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K705 | — | 00000 | — | 000000 | — | 000000 | — | — | ||
| 3 1/2" | 3 1/2" | 3" | 3" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K503 | — | 00000 | — | 00000 | — | 000000 | — | — | ||
| 4" | 4" | 3 1/2" | 3 1/2" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K634 | 00000 | 00000 | 000000 | 000000 | 000000 | 000000 | 000000 | — | ||
| 4" | 6" | 3 1/2" | 5 1/2" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K967 | — | 00000 | — | 000000 | — | 000000 | — | — | ||
| 4" | 8" | 3 1/2" | 7 1/2" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K515 | 000000 | 000000 | — | 000000 | — | — | — | — | ||
| 5" | 5" | 4 1/2" | 4 1/2" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K156 | — | 000000 | — | 000000 | — | 000000 | — | — | ||
| 6" | 6" | 5 1/2" | 5 1/2" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K644 | — | 000000 | — | 000000 | 000000 | 000000 | 000000 | — | ||
5/16" Thick Wall | ||||||||||||||||||||||
| 4" | 4" | 3 3/8" | 3 3/8" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K157 | 00000 | 00000 | — | 000000 | — | — | — | — | ||
| 6" | 6" | 5 3/8" | 5 3/8" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K256 | 00000 | 00000 | — | 000000 | — | — | — | — | ||
3/8" Thick Wall | ||||||||||||||||||||||
| 3" | 3" | 2 1/4" | 2 1/4" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K257 | — | 00000 | — | 00000 | — | 000000 | — | — | ||
| 4" | 4" | 3 1/4" | 3 1/4" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K416 | 00000 | 00000 | — | 000000 | — | — | — | — | ||
| 6" | 6" | 5 1/4" | 5 1/4" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K579 | 00000 | 000000 | — | 000000 | — | — | — | — | ||
| 8" | 8" | 7 1/4" | 7 1/4" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K813 | 00000 | 000000 | — | 000000 | — | — | — | — | ||
1/2" Thick Wall | ||||||||||||||||||||||
| 4" | 4" | 3" | 3" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K417 | 00000 | 00000 | — | 000000 | — | — | — | — | ||
| 4" | 6" | 3" | 5" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K466 | 000000 | 000000 | — | 000000 | — | — | — | — | ||
| 4" | 8" | 3" | 7" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K467 | 000000 | 000000 | — | 000000 | — | — | — | — | ||
| 6" | 6" | 5" | 5" | Round | Round | Welded | ERW | 46,000 | Not Rated | Not Rated | ASTM A500 | 6527K864 | 00000 | 000000 | — | 000000 | — | — | — | — | ||
| 8" | 8" | 7" | 7" | Round | Round | Welded | ERW | 39,000 | Not Rated | Not Rated | ASTM A500 | 6527K526 | 000000 | 000000 | — | 000000 | — | — | — | — | ||
1 mm Thick Wall | ||||||||||||||||||||||
| 12 mm | 12 mm | 10 mm | 10 mm | Round | Round | Welded | ERW | 34,000 | 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 | 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 | 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 | 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 | 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 | Rockwell B65 (Medium) | Not Rated | EN 10305-5 | 6527K76 | — | 000000 | — | 000000 | — | 000000 | — | — | ||
Weldable 4130 Alloy Steel Rectangular Tubes
 |
Made from 4130 alloy steel, also known as chrome-moly steel, these tubes have low carbon content for good weldability. They’re often used for building frames and supports, since their flat sides make them easier to bolt than round tubes. To increase their wear resistance, you can 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 | Yield Strength, psi | Hardness | Max. Hardness After Heat Treatment | Specs. Met | 1/2 ft. Long | 1 ft. Long | 2 ft. Long | 3 ft. Long | 6 ft. Long | |||
0.035" Thick Wall | ||||||||||||||||||
| 3/8" | 3/8" | 0.305" | 0.305" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K21 | 000000 | 000000 | 000000 | 000000 | 000000 | ||
| 1/2" | 1/2" | 0.43" | 0.43" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K22 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 1/2" | 1" | 0.43" | 0.93" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6566K25 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 5/8" | 5/8" | 0.555" | 0.555" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K23 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 3/4" | 3/4" | 0.68" | 0.68" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K24 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 1" | 1" | 0.93" | 0.93" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K26 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
0.049" Thick Wall | ||||||||||||||||||
| 1/2" | 1" | 0.402" | 0.902" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6566K52 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 5/8" | 5/8" | 0.527" | 0.527" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K27 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 3/4" | 3/4" | 0.652" | 0.652" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K28 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 3/4" | 1 1/2" | 0.652" | 1.402" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6566K31 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 1" | 1" | 0.902" | 0.902" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K29 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 1" | 1 1/2" | 0.902" | 1.402" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6566K54 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
0.065" Thick Wall | ||||||||||||||||||
| 1/2" | 1" | 0.37" | 0.87" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6566K33 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 5/8" | 5/8" | 0.495" | 0.495" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K32 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 3/4" | 3/4" | 0.62" | 0.62" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K41 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 1" | 1" | 0.87" | 0.87" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K43 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 1" | 1 1/2" | 0.87" | 1.37" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6566K34 | 00000 | 00000 | 00000 | 000000 | 000000 | ||
| 1" | 1 3/4" | 0.87" | 1.62" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6566K35 | 00000 | 00000 | 00000 | 000000 | 000000 | ||
| 1" | 2" | 0.87" | 1.87" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6566K56 | 00000 | 00000 | 00000 | 000000 | 000000 | ||
