1 Introduction
Micro-alloyed steels(yield strength) | |||||||||
---|---|---|---|---|---|---|---|---|---|
Grade | S315MC | S355MC | S420MC | S460MC | S500MC | S550MC | S600MC | S650MC | S700MC |
Thickness/mm | 1.5–12.0 | 1.75–12.0 | 1.9–12.0 | 2.0–8.0 | 2.0–6.5 | ||||
Width /mm | 75–2 000 | 100–1 900 |
Ferritic-bainitic steels | Dual phase steels | Martensitic steels | |||
---|---|---|---|---|---|
Grade | FB-W 500 | FB-W 600 | DP-W600 | MS-W 1000 | MS-W 1200 |
Thickness/mm | 1.75–5.5 | 1.75–4.0 | 1.6–5.5 | 1.5–3.0 | |
Width /mm | 100–1 900 | 100–1 650 | 100–1 550 | 600–1 400 |
2 Enhanced properties of high performance steel by Nb microalloying
Gage (d)/mm | Sample position | Yield strength /MPa | Tensile strength /MPa |
A/% | Charpy energy/J | Bending test | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Temperature=0 °C | Temperature=−20 °C | |||||||||||
Sample 1 | Sample 2 | Sample 3 | Sample 1 | Sample 2 | Sample 3 | Bending angle /(°) |
r = 4t
| |||||
5.8 | Trans. | 944 | 1 066 | 12.8 | 65 | 67 | 64 | — | — | — | 90° | Ok |
Long. | 946 | 1 059 | 14.2 | — | — | — | 52 | 54 | 53 | 90° | Ok |
Blanking length/mm | Flatness deviation in rolling direction/mm | Flatness deviation in transverse direction/mm | Straightness after blanking | Warping |
---|---|---|---|---|
6 000 | 0.1 | 0.2 | <1 mm/1 000 mm | 0 |
Steel grade |
w(C)/% |
w(Si)/% |
w(Mn)/% |
w(Cr)/% |
w(Mo)/% |
w(Ni)/% |
w(Nb)/% |
---|---|---|---|---|---|---|---|
Concept V1
| 0.26 | 0.12 | 1.46 | 1.23 | 0.54 | 0.91 | 0.03 |
Concept V2
| 0.21 | 0.25 | 1.17 | 1.15 | 0.21 | 0.22 | 0.04 |
18CrNiMo7-6 (1.6587) | 0.15–0.21 | ≤0.40 | 0.50–0.90 | 1.50–1.80 | 0.25–0.35 | 1.40–1.70 |
Property | Concept V1
| Concept V2
| 18CrNiMo7-6 |
---|---|---|---|
Tensile stregth/MPa | 1 758 | 1 182 | 1 182 |
Impact energy/J | 47 | 55 | 80 |
Rotating fatigue limit σ(50%)@N = 107 MPa | 722 | 491 | 510 |
Hardenability@11 mm /HRC | 51 | 44 | 41 |
Hardenability@25 mm /HRC | 50 | 36 | 36 |
Steel grade |
w(C)/% |
w(Si)/% |
w(Mn)/% |
w(Cr)/% |
w(Mo)/% |
w(Cu)/% |
w(Nb)/% |
w(Ti)/% |
---|---|---|---|---|---|---|---|---|
42SiCrMo modified | 0.40–0.43 | 2.0–3.0 | 0.70–0.85 | 0.90–1.15 | 0.15–0.25 | 0.25 | 0.04 | 0.02 |