Material number K03006: A333 Grade 6
K03006 is the Unified Numbering System designation for A333 Grade 6, carbon steel pipe for low-temperature service, impact tested at −45 °C specified in ASTM A333.
Reading K03006 digit by digit
A UNS designation (ASTM E527 / SAE J1086) is a letter followed by five digits. The letter K marks the alloy family — here miscellaneous steels and ferrous alloys — and the five digits 03006 place the composition inside it, usually by carrying an older AISI or SAE number forward.
What a UNS number does not carry is the product form or the property level. K03006 therefore appears in several ASTM specifications — plate, bar, pipe, forging — each with its own mechanical requirements, and the number alone is not a complete purchase specification.
K03006 identity card
| Item | Value |
|---|---|
| UNS number (ASTM E527) | K03006 |
| Symbolic grade name | A333 Grade 6 |
| Steel group | K — miscellaneous steels and ferrous alloys |
| Sequential number in group | 03006 |
| Specified in | ASTM A333 |
| Steel family | Pipe & tube steel |
| Yield, first condition in the table | 240 MPa (Grade 6 — specified minimum) |
| Tensile, same condition | 415 MPa |
| Cross-references held | 8 grades in 4 systems |
ASTM A333 Grade 6 is the low-temperature carbon steel pipe: 240 MPa yield, 415 MPa tensile, Charpy tested at −45 °C. Composition, impact requirement and the A106 difference.
Full data sheet for A333 Grade 6 → · Equivalent grades → · ASTM A333 →
UNS K — the neighbouring numbers
| UNS number | Grade | Type |
|---|---|---|
| K02303 | A572 Grade 50 | High-strength low-alloy (HSLA) columbium-vanadium structural steel |
| K02600 | A36 | Carbon structural steel |
| K02700 | A516 Grade 70 | Carbon steel plate for pressure vessels, moderate and lower temperature |
| K03005 | A53 Grade B | Pipe steel for general and structural service, welded or seamless |
| K03006 | A106 Grade B | Seamless carbon steel pipe for high-temperature service |
Same UNS letter, so the same alloy family. The digits generally carry an older AISI or SAE number.