ROCKSTAR 450
New-generation wear-resistant plates from Jindal Steel & Power. Quenched / Quenched & Tempered for superior hardness, toughness and fabrication ease.Datasheet • ROCKSTAR Series
1) General Description
Introducing the new generation of ROCKSTAR Wear Resistant Plates – grades 400, 450 and 500. Produced through cutting-edge Quenched or Quenched & Tempered process, the plates deliver high hardness with excellent toughness and tight dimensional tolerances for easy fabrication. Individual size capability depends on actual plate dimensions; thickness > 100 mm can be serviced by mutual discussion.
Higher Hardness
High Toughness
Tight Tolerances
Ease of Fabrication
2) Dimension Range
- Thickness: 8 – 100 mm*
- Width: 1500 – 4800 mm
- Length: As per requirement
*Thickness > 100 mm on discussion with customer.
3) Typical Hardness by Grade
| Grade | Hardness (BHN) |
|---|---|
| ROCKSTAR 400 | 360 Min (Typical 360–450) |
| ROCKSTAR 450 | 425 Min (Typical 425–500) |
| ROCKSTAR 500 | 470 Min (Typical 470–550) |
Brinell hardness per EN ISO 6506-1 on milled surface 0.5–3.0 mm below surface.
4) Mechanical Properties (Typical)
| Grade | YS (MPa) | UTS (MPa) | Elongation A5 | Impact Toughness |
|---|---|---|---|---|
| ROCKSTAR 400 | 1100 | 1250 | 12% | 25J (avg) / 20J (ind) @ −40°C |
| ROCKSTAR 450 | 1150 | 1300 | 12% | 25J (avg) / 20J (ind) @ −40°C |
| ROCKSTAR 500 | 1250 | 1600 | 10% | 25J (avg) / 20J (ind) @ −40°C |
Typical tensile values up to 20 mm for reference. Supplementary tests (Tensile/CVN) can be mutually agreed.
5) Chemical Composition – Max (%), Heat Analysis
| Grade | C | Mn | P | S | Si | Cr | Ni | Mo | B (ppm) | CEV |
|---|---|---|---|---|---|---|---|---|---|---|
| RS 400 | 0.25 | 1.60 | 0.030 | 0.010 | 0.50 | 0.90 | 0.50 | 0.50 | 50 | 0.63 |
| RS 450 | 0.30 | 1.60 | 0.030 | 0.010 | 0.70 | 1.40 | 1.50 | 1.00 | 50 | 0.66 |
| RS 500 | 0.30 | 1.60 | 0.030 | 0.010 | 0.70 | 2.00 | 1.50 | 1.00 | 50 | 0.75 |
%CE(IIW)=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15. Al≥0.02; (Nb+V+Ti)≤0.15 combined.
6) Typical Carbon Equivalent (Guidance)
| Grade | CE (8–40 mm) | CE (>40–100 mm) |
|---|---|---|
| RS 400 | 0.45–0.48 | 0.55–0.60 |
| RS 450 | 0.52–0.60 | 0.60–0.63 |
| RS 500 | 0.60–0.63 | 0.65–0.75 |
Guidance only; guaranteed values as per CEV table.
7) Cold Forming – Recommended Bend Radii
| Grade | Angle | Thickness Range | Bend Radius (T = thickness) |
|---|---|---|---|
| RS 400 | 90° | t < 8 | 2.5T |
| RS 400 | 90° | 8 ≤ t < 20 | 3.0T |
| RS 400 | 90° | 20 ≤ t < 50 | 4.0T |
| RS 450 | 90° | 8 ≤ t < 12 | 4.0T |
| RS 450 | 90° | 12 ≤ t ≤ 60 | 6.0T |
| RS 500 | 90° | 8 ≤ t < 12 | 6.0T |
| RS 500 | 90° | 12 ≤ t ≤ 60 | 8.0T |
8) Welding Parameters (Guidance)
- Use low-hydrogen consumables: E7018H4 / E8018G
- Preheat (≥30 mm): 120–170°C
- Interpass temperature: ≤ 220°C
- Heat input: 1.5 – 2.0 kJ/mm
- All conventional methods (SMAW, SAW, MIG/MAG) applicable
Low CE gives good weldability; lower-strength consumables help toughness & reduce hydrogen cracking.
9) Heat Treatment & Service
- Supplied As-Quenched / Quenched & Tempered
- Mechanical properties guaranteed by water quenching / Q&T
- Do not expose to preheat/service temperatures > 220°C
- Not intended for further heat treatment
10) Applications
- Dump body trucks, loaders, shovels, bulldozer buckets
- Crushers, mixers, chutes, hoppers, body liners
- Yellow goods, construction, mining & material-handling equipment
- Environments with hard rocks, bulk loading & explosive shocks
11) Tolerances & Testing
- Thickness: EN 10029 Class A (Class B/C/D on request)
- Width & Length: EN 10029 / as agreed
- Flatness: EN 10029 Class N Type H (tighter on request)
- Surface: EN 10163-2 Class A Subclass 1 / as required
- UT: EN 10160 S0E0 / S1E1 or ASTM 578 Level A/B/C or ASTM A435
12) USP – Manufacturing
- 300 mm slab caster → high reduction ratio → uniform properties
- MULPIC cooling → superior surface & homogeneous properties
- 200-bar descaling, power leveler for stringent flatness
- Heat-treatment facility up to 150 mm (200 mm under installation)