STANDARD MATERIALS

MATERIALS & SURFACES

C60S

Material 1.1211

per DIN EN 10132-4 

Carbon spring steel used in original SCHNORR® family of safety washers and load washer.

Ref: SAE 1060

C67S

Material 11231 & C75S

Material 1.1248

per DIN EN 10132-4 

Carbon spring steel used in DIN EN 16983 (Formerly DIN2093) disc springs with a thickness of less than 1.25 mm.

Ref: SAE 1075

51CRV4

Material Nr. 1.8159

per DIN EN 10132-4

or DIN 10089

Chromium-vanadium alloyed is used in disc springs with a thickness greater than 1.25 mm

Ref: SAE 6150

 

SPECIAL MATERIALS

Chromium-nickel alloyed steel is available up to a thickness of t = 3.0 mm.The cold forming process makes it magnetic.

Ref: AISI 301

X10

Material Nr. 1.4310 

per DIN EN 10151

Precipitation-hardened spring steel is available in thicknesses up to approx. 2.5 mm. The cold-forming process makes this material magnetic.

Ref: AISI 631/ 17-7 PH

X7

Material Nr. 1.4568

per DIN EN 10151

Austenitic stainless steel with excellent corrosion resistance.  Used in the original SCHNORR® family of corrosion-resistant serrated safety washers.

Ref: AISI 304

X5

Material Nr. 1.4301

per DIN EN 10151

Chromium-molybdenum-vanadium steel is effective for high-temperature applications (500 deg C).  Material is NOT corrosion resistant.

X22

Material Nr. 1.4923

per DIN EN 10263

Nickel-Chromium alloy with excellent corrosion resistance suitable for very high-temperature applications (600C).  A potential creeping under load might lead to a loss of installation height or loss of force of the disc spring. This creeping will happen as a result from exposure to temperature, time and tension.

Inconel X718

Material 2.4668

A copper alloy with tin. Spring characteristics are due to cold forming. Please note that the strength values and the spring forces resulting from it are considerably lower than with the standard material. Used in original SCHNORR® family of non-magnetic serrated safety washers.

Bronze

(CuSn8)

Material 2.1030

per DIN EN 1654

 

SURFACES

Phosphating

A standard process generally applied for disc springs made of low-alloy steels. A zinc phosphate layer is produced on the surface, which is then impregnated with corrosion-protection oil. In most cases, the protection achieved in this way is sufficient. No additional protection is required if the springs are installed with weather protection.

Mechanical

Zinc

The parts being treated are moved into a barrel together with peening materials, e.g. glass beads, a promoter and powdered zinc. This powder deposits on the surface and is compacted by the peening material. This produces a uniform, non-glare coating, which subsequently can be chromatized in a similar way as electroplating. The usual layer thickness is 8 μm, however, thicknesses of up to 40 μm are possible. 

Geomet

An inorganic, metallic silver-gray coating made of zinc and aluminum flakes. The parts are suitable with barrel or rack plating. Afterwards, the coating is baked into the surface. Disc springs coated with this process show  excellent resistance in salt spray tests. 

Zinc

Flake

An inorganic, metallic silver-gray coating made of zinc and aluminum flakes. The parts are suitable with barrel or rack plating. Afterwards, the coating is baked into the surface. Disc springs coated with this process show  excellent resistance in salt spray tests. 

SYNOPTIC TABLE

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