SAE Grades
The Society of Automotive Engineers (SAE) maintains standards for HSLA steel grades because they are often used in automotive applications.
| Grade | % Carbon (max) | % Manganese (max) | % Phosphorus (max) | % Sulfur (max) | % Silicon (max) | Notes |
|---|---|---|---|---|---|---|
| 942X | 0.21 | 1.35 | 0.04 | 0.05 | 0.90 | Niobium or vanadium treated |
| 945A | 0.15 | 1.00 | 0.04 | 0.05 | 0.90 | |
| 945C | 0.23 | 1.40 | 0.04 | 0.05 | 0.90 | |
| 945X | 0.22 | 1.35 | 0.04 | 0.05 | 0.90 | Niobium or vanadium treated |
| 950A | 0.15 | 1.30 | 0.04 | 0.05 | 0.90 | |
| 950B | 0.22 | 1.30 | 0.04 | 0.05 | 0.90 | |
| 950C | 0.25 | 1.60 | 0.04 | 0.05 | 0.90 | |
| 950D | 0.15 | 1.00 | 0.15 | 0.05 | 0.90 | |
| 950X | 0.23 | 1.35 | 0.04 | 0.05 | 0.90 | Niobium or vanadium treated |
| 955X | 0.25 | 1.35 | 0.04 | 0.05 | 0.90 | Niobium, vanadium, or nitrogen treated |
| 960X | 0.26 | 1.45 | 0.04 | 0.05 | 0.90 | Niobium, vanadium, or nitrogen treated |
| 965X | 0.26 | 1.45 | 0.04 | 0.05 | 0.90 | Niobium, vanadium, or nitrogen treated |
| 970X | 0.26 | 1.65 | 0.04 | 0.05 | 0.90 | Niobium, vanadium, or nitrogen treated |
| 980X | 0.26 | 1.65 | 0.04 | 0.05 | 0.90 | Niobium, vanadium, or nitrogen treated |
| Grade | Form | Yield strength (min) | Ultimate tensile strength (min) |
|---|---|---|---|
| 942X | Plates, shapes & bars up to 4 in. | 42,000 (290) | 60,000 (414) |
| 945A, C | Sheet & strip | 45,000 (310) | 60,000 (414) |
| Plates, shapes & bars: | |||
| 0–0.5 in. | 45,000 (310) | 65,000 (448) | |
| 0.5–1.5 in. | 42,000 (290) | 62,000 (427) | |
| 1.5–3 in. | 40,000 (276) | 62,000 (427) | |
| 945X | Sheet, strip, plates, shapes & bars up to 1.5 in. | 45,000 (310) | 60,000 (414) |
| 950A, B, C, D | Sheet & strip | 50,000 (345) | 70,000 (483) |
| Plates, shapes & bars: | |||
| 0–0.5 in. | 50,000 (345) | 70,000 (483) | |
| 0.5–1.5 in. | 45,000 (310) | 67,000 (462) | |
| 1.5–3 in. | 42,000 (290) | 63,000 (434) | |
| 950X | Sheet, strip, plates, shapes & bars up to 1.5 in. | 50,000 (345) | 65,000 (448) |
| 955X | Sheet, strip, plates, shapes & bars up to 1.5 in. | 55,000 (379) | 70,000 (483) |
| 960X | Sheet, strip, plates, shapes & bars up to 1.5 in. | 60,000 (414) | 75,000 (517) |
| 965X | Sheet, strip, plates, shapes & bars up to 0.75 in. | 65,000 (448) | 80,000 (552) |
| 970X | Sheet, strip, plates, shapes & bars up to 0.75 in. | 70,000 (483) | 85,000 (586) |
| 980X | Sheet, strip & plates up to 0.375 in. | 80,000 (552) | 95,000 (655) |
| Rank | Weldability | Formability | Toughness |
|---|---|---|---|
| Worst | 980X | 980X | 980X |
| 970X | 970X | 970X | |
| 965X | 965X | 965X | |
| 960X | 960X | 960X | |
| 955X, 950C, 942X | 955X | 955X | |
| 945C | 950C | 945C, 950C, 942X | |
| 950B, 950X | 950D | 945X, 950X | |
| 945X | 950B, 950X, 942X | 950D | |
| 950D | 945C, 945X | 950B | |
| 950A | 950A | 950A | |
| Best | 945A | 945A | 945A |
Read more about this topic: High-strength Low-alloy Steel
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