1.4034, S42026 doctor blade steel strip

1.4034, S42026 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

Forms of supply

1.4034, S42026 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.