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ULTRA HIGH-STRENGTH STEEL
FEATURES
U. S. Steel's Martensitic ultra-high strength steels meet roll-forming applications needs that require extreme flatness with excellent bendability. These grades are ideal for use in crash intrusion protection parts and manufacturing large components where safety of the automotive body structure is critical.
State-of-the-art shape control process
Our Martensitic grades utilize the continuous annealing line (CAL) process that precisely controls heating and cooling operations, resulting high strength and good formability. Precise control of pressure across and through the coil ensures superior flatness that is well within roll forming industry guidelines for tolerances and results in less waste with greater yield. CAL grades are available bare or with an electrogalvanized (EG) coating.
PRODUCT SHEET
APPLICATIONS
- Front Bumper Beams
- Rear Bumper Beams
- Door Intrusion Beams
- Side Sill Reinforcements
- Roof Rail Reinforcements
- Roof Bow
- Cross Members
- Floor Rails
PRODUCT FORMABILITY AND GUARANTEED PROPERTIES
| PRODUCT | MARTENSITIC 1100 CAL GRADE |
MARTENSITIC 1300 CAL GRADE |
MARTENSITIC 1500 CAL GRADE |
MARTENSITIC 1700 CAL GRADE |
|---|---|---|---|---|
| Formability Classification* | Local | Local | Local | Local |
| Tensile Strength (MPa)* | 1,100 (min.) | 1,300 (min.) | 1,500 (min.) | 1,700 (min.) |
| Yield Strength (MPa)* | 860 – 1,100 | 1,030 – 1,300 | 1,200 – 1,500 | 1,350 – 1,700 |
| Total Elongation (%)* | ≥ 3 | ≥ 3 | ≥ 3 | ≥ 3 |
| Specimen Geometry* | ASTM-L | ASTM-L | ASTM-L | ASTM-L |
* Property ranges provided are guaranteed properties at the center of the strip at room temperature.