Sanprint™ RPS Strip steel

Datasheet updated

2022-07-19 13:12
(supersedes all previous editions)

Sanprint RPS 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)

Chemical composition (nominal) %
C Si Mn Cr Mo
0.38 0.4 0.55 13.5 1.0

Chemical composition (nominal) %

C Si Mn Cr Mo
0.38 0.4 0.55 13.5 1.0

Forms of supply

Sanprint 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.

Sanprint RPS microstructure

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.