Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
Durehete Mechanical Properties — Room Temperature & Elevated Temperature (EN 10269)
EN 10269 specifies the room-temperature mechanical floor for each Durehete grade in the quenched-and-tempered condition. Annex A publishes the elevated-temperature 0.2 percent proof stress and 100,000-hour stress-rupture design data.
Room-Temperature Mechanical Properties
| Property | Durehete 1055 (T41) | Durehete 950 (T31) | Durehete 900 (T22) |
|---|---|---|---|
| Tensile strength | 820 to 1000 MPa | 800 to 950 MPa | 750 to 900 MPa |
| 0.2% proof stress, min | 660 MPa | 620 MPa | 580 MPa |
| Elongation, min | 16% | 16% | 16% |
| Reduction of area, min | 50% | 45% | 45% |
| Brinell hardness | 250 to 320 HBW | 240 to 300 HBW | 230 to 280 HBW |
| Charpy V-notch impact (longitudinal), min at +20°C | 40 J | 40 J | 40 J |
0.2 Percent Proof Stress at Elevated Temperature
| Temperature | 1055 (T41) | 950 (T31) | 900 (T22) |
|---|---|---|---|
| 425°C | 540 MPa | 510 MPa | 460 MPa |
| 475°C | 500 MPa | 460 MPa | 410 MPa |
| 525°C | 440 MPa | 390 MPa | — |
| 540°C | 420 MPa | 360 MPa | — |
| 565°C | 380 MPa | — | — |
EN 10269 Annex A lookup values; design-stress reductions per the standard.
100,000-Hour Stress-Rupture Envelope
| Temperature | 1055 (T41) | 950 (T31) | 900 (T22) |
|---|---|---|---|
| 500°C | ~340 MPa | ~300 MPa | ~240 MPa |
| 525°C | ~310 MPa | ~260 MPa | ~180 MPa |
| 540°C | ~280 MPa | ~230 MPa | — |
| 565°C | ~200 MPa | — | — |
Frequently Asked Questions
What is the room-temperature tensile strength of Durehete 1055?
820 to 1000 MPa in the Q+T condition with a minimum 0.2 percent proof stress of 660 MPa. The mill targets the middle of the band by tempering temperature selection.
Does Durehete 1055 hold its strength at 565 degrees Celsius?
Yes — 0.2 percent proof stress at 565 degrees Celsius is approximately 380 MPa, and the 100,000-hour stress-rupture is approximately 200 MPa. EN 10269 Annex A publishes the design-stress envelope.
How does Durehete 1055 compare to ASTM A193 B16 mechanically?
B16 specifies higher minimum yield (724 MPa vs 660 MPa for Durehete 1055) but the elevated-temperature envelope is comparable. Dual certification is achievable on Durehete 950 (Alloy T31).
Are impact-test temperatures specified?
Charpy V-notch at +20 degrees Celsius is the EN 10269 default; -10 and -20 degree variants are available on procurement specification.
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