Material number G52986: 52100
G52986 is the Unified Numbering System designation for 52100, high-carbon chromium bearing steel specified in ASTM A295.
Reading G52986 digit by digit
A UNS designation (ASTM E527 / SAE J1086) is a letter followed by five digits. The letter G marks the alloy family — here AISI and SAE carbon and alloy steels — and the five digits 52986 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. G52986 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.
G52986 identity card
| Item | Value |
|---|---|
| UNS number (ASTM E527) | G52986 |
| Symbolic grade name | 52100 |
| Steel group | G — AISI and SAE carbon and alloy steels |
| Sequential number in group | 52986 |
| Specified in | ASTM A295 |
| Steel family | Bearing steel |
| Yield, first condition in the table | ≈ 450 MPa (Spheroidize annealed (delivery) — typical) |
| Tensile, same condition | ≈ 680 MPa |
| Cross-references held | 10 grades in 6 systems |
52100 steel (AISI/SAE 52100, UNS G52986, E52100): 1.0 % C, 1.5 % Cr bearing steel. Hardens to 60–67 HRC; 58–62 HRC in service. Composition, heat treatment, 52100 as knife steel, 100Cr6/SUJ2/GCr15/EN31 equivalents.
Full data sheet for 52100 → · Equivalent grades → · ASTM A295 →
UNS G — the neighbouring numbers
| UNS number | Grade | Type |
|---|---|---|
| G10100 | SAE 1010 | Low-carbon steel for cold forming, welding and case hardening |
| G10180 | 1018 | Low-carbon steel, cold-finished bar (case-hardenable) |
| G10450 | 1045 | Medium-carbon steel, hardenable |
| G10950 | 1095 | High-carbon steel (spring / knife / blade steel) |
| G41300 | 4130 | Chromium-molybdenum low-alloy steel, weldable (chromoly) |
| G41400 | 4140 | Chromium-molybdenum low-alloy steel (chromoly) |
| G43400 | 4340 | Nickel-chromium-molybdenum low-alloy steel, deep hardening |
| G86200 | 8620 | Nickel-chromium-molybdenum case-hardening steel |
Same UNS letter, so the same alloy family. The digits generally carry an older AISI or SAE number.