Material number G10100: SAE 1010
G10100 is the Unified Numbering System designation for SAE 1010, low-carbon steel for cold forming, welding and case hardening specified in ASTM A29.
Reading G10100 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 10100 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. G10100 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.
G10100 identity card
| Item | Value |
|---|---|
| UNS number (ASTM E527) | G10100 |
| Symbolic grade name | SAE 1010 |
| Steel group | G — AISI and SAE carbon and alloy steels |
| Sequential number in group | 10100 |
| Specified in | ASTM A29 |
| Steel family | Carbon steel |
| Also carries Werkstoff No. | 1.0301 |
| Yield, first condition in the table | 180 MPa (hot rolled bar) |
| Tensile, same condition | 325 MPa |
| Cross-references held | 5 grades in 3 systems |
SAE 1010 (UNS G10100) is the low-carbon workhorse: 0.08–0.13 % C, 0.30–0.60 % Mn, tensile 325–365 MPa, elongation 20–28 %. Full chemistry, EN C10 / 1.0301 and JIS S10C equivalents, cold forming and carburizing data.
Full data sheet for SAE 1010 → · Equivalent grades → · ASTM A29 →
UNS G — the neighbouring numbers
| UNS number | Grade | Type |
|---|---|---|
| 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 |
| G51600 | 5160 | Chromium spring steel, quenched and tempered |
| G52986 | 52100 | High-carbon chromium bearing steel |
| G61500 | 51CrV4 | Chromium-vanadium spring steel, quenched and tempered |
| G86200 | 8620 | Nickel-chromium-molybdenum case-hardening steel |
| G92600 | 9260 | Silicon-manganese spring steel, quenched and tempered |
Same UNS letter, so the same alloy family. The digits generally carry an older AISI or SAE number.