Material number G86200: 8620
G86200 is the Unified Numbering System designation for 8620, nickel-chromium-molybdenum case-hardening steel specified in ASTM A29.
Reading G86200 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 86200 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. G86200 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.
G86200 identity card
| Item | Value |
|---|---|
| UNS number (ASTM E527) | G86200 |
| Symbolic grade name | 8620 |
| Steel group | G — AISI and SAE carbon and alloy steels |
| Sequential number in group | 86200 |
| Specified in | ASTM A29 |
| Steel family | Case-hardening steel |
| Yield, first condition in the table | ≈ 385 MPa (Annealed (860 °C, furnace cool) — typical) |
| Tensile, same condition | ≈ 540 MPa |
| Cross-references held | 9 grades in 6 systems |
8620 steel (AISI/SAE 8620, UNS G86200): 0.20 % C, 0.55 % Ni, 0.5 % Cr, 0.2 % Mo case-hardening steel. Carburized case 58–62 HRC over 800–1000 MPa core. Composition, heat treatment, 8620 vs 4140/1018, 21NiCrMo2/SNCM220/20CrNiMo equivalents.
Full data sheet for 8620 → · Equivalent grades → · ASTM A29 →
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 |
| G52986 | 52100 | High-carbon chromium bearing steel |
Same UNS letter, so the same alloy family. The digits generally carry an older AISI or SAE number.