Alleima® Print RPS (Regular Performance Stainless) is a hardened and tempered chromium steel used for printing doctor blade applications. The grade is a standard martensitic stainless steel suitable for water-based inks and laminating and is characterized by:
- Good corrosion resistance
- High wear resistance
- Good straightness
- Good dimensional tolerances
- Excellent edge finish
Standards
- UNS: S42026
- EN Number: 1.4034*
* Nearest equivalent grade
Chemical composition (nominal)
| C | Si | Mn | Cr | Mo |
|---|---|---|---|---|
| 0.38 | 0.4 | 0.55 | 13.5 | 1.0 |
Forms of supply
Alleima® Print RPS is supplied in coils with inner diameter 350 mm (13.8 in.). Approximately 15 meters of strip material is unshaved on the innermost rings of the coil.
Dimensions
| Thickness mm (in.) | Width mm (in.) | ||
|---|---|---|---|
| min. | max. | min. | max. |
| 0.076 (0.003) | 0.305 (0.012) | 8.00 (0.315) | 70.0 (2.76) |
Other sizes can be offered on request.
Surface condition
The standard surface offered is white polished.
Surface roughness
Surface roughness is measured transversal to the rolling direction with a cut off length of 0.25 mm (0.0098 in.).
| Thickness mm (in.) | Ra µm (µin.) | Rmax µm (µin.) |
|---|---|---|
| 0.076 (0.003) - 0.305 (0.012) | (Y8) 0.05 - 0.125 (2 - 5) | 1.5 (60) |
Surface defects
Maximum allowed depth of surface defects (excluding burrs):
| Thickness mm (in.) | Scratches µm (µin.) | Single minor surface defects µm (µin.) |
|---|---|---|
| 0.076 (0.003) - 0.305 (0.012) | ≤ 5 (200) | ≤ 5 (200) |
Edges
As standard, strip is supplied with round, shaved edges with no sharp corners and with no friction-induced martensite. Edge surface defects such as pits or burrs, ≤ 5 µm (200 µin.).
The edge radius should be at least equal to half of the strip thickness.
Tolerances
Shape
Straightness
Width > 12.1 mm, R spec = max. 1.4 mm deviation on a 3000 mm length.
Widths < 12 mm, R spec = max. 2.5 mm deviation on a 3000 mm length.
Flatness
Cross bow hardened and tempered strip (H/T) in all tensile strengths (P1 is the Alleima standard).
| Tolerance class | Cross bow % of width |
|---|---|
| H/T condition | |
| P0 | No requirements |
| P1 | max. 0.4 |
| P2 | max. 0.3 |
| P3 | max. 0.2 |
Other tolerances may be possible on request.
Width (B1 is standard)
| Thickness | Width | Width tolerance +/- mm | ||
|---|---|---|---|---|
| mm | mm | B1 | B2 | B3 |
| 0.076 - 0.25 | 8 - <20 | 0.07 | 0.05 | 0.03 |
| 20 - <50 | 0.10 | 0.07 | 0.05 | |
| 50 - <70 | 0.15 | 0.11 | 0.07 | |
| 0.251 - 0.305 | 8 - <20 | 0.10 | 0.07 | 0.05 |
| 20 - <50 | 0.15 | 0.11 | 0.07 | |
| 50 - <70 | 0.20 | 0.15 | 0.10 | |
Thickness (T1 is standard)
| Thickness | Width | Thickness tolerance +/- mm | ||
|---|---|---|---|---|
| mm | mm | T1 | T2 | T3 |
| 0.076 - <0.1 | 8 - 70 | 0.006 | 0.005 | 0.004 |
| 0.1 - <0.125 | 8 - 70 | 0.007 | 0.005 | 0.004 |
| 0.125 - <0.16 | 8 - 70 | 0.009 | 0.006 | 0.005 |
| 0.16 - <0.2 | 8 - 70 | 0.01 | 0.007 | 0.005 |
| 0.2 - <0.25 | 8 - 70 | 0.011 | 0.008 | 0.006 |
| 0.25 - <0.305 | 8 - 70 | 0.013 | 0.009 | 0.007 |
Mechanical properties
| Thickness mm (in.) | Tensile strength Rm | Hardness* | |
|---|---|---|---|
| MPa | ksi | Vickers, HV | |
| 0.076 (0.003) - 0.305 (0.012) | 1800 +/- 100 | 261 +/- 14.5 | 535 +/-25 |
* Hardness (HV) value is given for information only.
Microstructure
The microstructure is uniform and consists of tempered martensite with a medium amount of small undissolved carbides.
Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Alleima materials.