DISC SPRINGS MATERIALS 

There is a wide variety of materials with marked different mechanical properties compared to to standard steel springs. From different types of stainless steel to withstand corrosion, other special steels used to withstand extreme temperatures or both factors simultaneously. At the time of making the calculations you must take into account these differences. You can contact us if you require help on this or other aspects.

Based on the selected material the belleville washer may work in negative temperature -260ºC and up to 700ºC . Positive Non-magnetic properties and corrosion resistance are other key aspects when deciding on the material.

These are the main materials available:

1. Steels for disc springs Din 2093

1. CK67 Carbon steel (material No. 1.1231, SAE 1070)
for material thickness less than 1.25 mm
2. 51CrV4 chrome vanadium steel (material No. 1.8159, SAE 6150)
for material thicknesses from 1.25 mm and above.

These materials are used with a purity superior to that prescribed by the DIN specifications. In our springs we only use those materials whose sulfur content is <= 0 ‘, 016%, and phosphorus content is <= 0.020%.

 2. Stainless Steels

1. X10CrNi18-8           (X9CrNi18-8 material No. 1.4310, AISI 301)
2. X5CrNiMo17-12-2     (X4CrNiMo17-12-2 material No. 1.4401, AISI 316)

These materials have a lower module of elasticity in comparison to the materials in section 1. They are suitable for the manufacture of disc springs when the thickness of the material is equal to or less than 2 mm.

1. X7CrNiAl17-7            (material No. 1.4568, AISI 631)
2. X39CrMo17-1           (material No. 1.4122 X35CrMo17)

These materials are suitable for the manufacture of disc springs in greater thicknesses.

 3. Heat resistant steels

1. 48CrMoV6-7    
(material No. 1.2323)  
supports up to 300ºC
2. X7CrNiAl17-7 
(material No. 1.4568)
supports up to 350ºC
3. X30WCrV5-3
(material No. 1.2567)
supports up to 400ºC
4. X39CrMo17-1  
(Material No. 1.4122 X35CrMo17)
supports up to 450ºC
5. X22CrMoV12-1
(material No. 1.4923)  
supports up to 500ºC

By using these steels, it should be noted that the stresses which occur in the cup spring with these materials, are in relation to the lower force offered by these steels at the higher temperatures, otherwise, a relaxation of spring would occur, superior to the ratios allowed. Furthermore it should be noted that the modulus of elasticity of all the material, decreases as the temperature arises. As a rule, a redesign of the cup spring may be necessary.

 4. Special alloys (anti-corrosion and non-magnetic)

1. NiCr20Co18Ti; (Nimonic 90) (Nimonic 90) (material No. 2.4969, AMS 5829)    supports up to 800ºC
2. NiCr19NbMo (Inconel 718) (material nº 2.4668 AMS 5596)   supports up to 700ºC
3. NiCr15Fe7TiAl (Inconel X750)(material No.2.4669,AMS 5598) supports up to 600ºC
4. Duratherm 600 (Co 40, Ni 26, Cr 12, Mo, W, Ti, Al, Bal, Fe)   supports up to 500ºC

   

With these materials, while dimensioning the belleville, you should also consider permissible stresses, depending on temperature and working conditions.

1. CuBe2 (beryllium copper)         (material No. 2.1247)
2. TiAl6V4 ;                              (material No. 3.7165)

These two materials have a modulus of elasticity considerably lower than the spring steel. This should be taken into account when designing the spring washers, taking care on material stresses.

All special alloys relating thereto, have in common that they are exceptionally resistant to corrosion by multiple agents. Additionally they are further non-magnetic, which is of utmost importance in electro technical applications.

 Additional protection against corrosion

As a complement to the material, or sometimes even as an alternative, it is possible to apply a finish disc springs with different types of coatings. . This will provide greater protection from corrosion.

Feel free to check for other materials that may meet your requirements.

In the following tables you will find more specific information for each item:

Chemical composition of materials of Disc Springs


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Material properties of Disc Springs


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Description of materials of disc springs for valves

AISI 17-7 PH – Stainless Steel (ASTM A693 , AMS 5528 )
Thermal Range : -240ºC to 300ºC. For both, indoor and outdoor, and for use in corrosive atmosphere. Not recommended for applications in environments with hydrochloric or hydrofluoric acids. For this reason Nickel silver coating is recommended for applications near marine environments. Suitable for cryogenic applications. Magnetic. Surface Finish: All washers are proven in height and free of burrs.

AISI 301 – Stainless Steel (ASTM A666 , AMS 5519)
Thermal Range : – 240ºC to 100ºC. For Interior and Exterior service and for use in corrosive atmosphere. Slightly magnetic. Surface Finish: All washers are proven in height and free of burrs.

Inconel 718 (ASTM B637)
Thermal Range : -240ºC to 600ºC. For high temperature and corrosive atmospheres. Indoor and outdoor service. NON – MAGNETIC . Surface Finish: All washers are proven in height and free of burrs.

Chemical properties

MaterialASTMCMnPSCrSiMoNiVCuAlTiTaCoB
17-7 PH A693

.09

1

.04

.03

17

1

*

7.1

*

1.1

*

*

*

*

*

301 A666

.15

2

*

*

17

1

*

7

*

*

*

*

*

*

*

718 B637

.08

.35

.015

.015

19

*

3

52.5

*

.03

.05

.09

5.1

1

.006

 

Physical properties

MaterialModulusYieldTemp. RangeFinishAvail. FinishMagnetic
17-7 PH

29,000,000

180,000

-400/550F

Deburred

Nickel

Yes

301

25,000,000

140,000

-400/550F

Deburred

*

Slightly

718

29,000,000

180,000

-400/1100F

Deburred

*

No

Description of materials in flange washer disc springs

17-7 PH – Stainless Steel (ASTM A693, AMS 5528)
Thermal Range: -240 º C to 300 º C. For both indoor and outdoor and for use in corrosive atmosphere. Not recommended for chloride or fluoride applications. A Nickel silver coating may be advisable if used near marine environments. Suitable for cryogenic applications. Magnetic. Surface Finish: All washers are proven in height and free of burrs.

Inconel 718 (ASTM B637)
Thermal Range: -240 º C to 600 º C. For high temperature and corrosive atmospheres. Indoor and outdoor service. NON-MAGNETIC. Surface Finish: All washers are proven in height and free of burrs.

H-13 Tool Steel (ASTM A681)
Thermal Range: -160 º C to 600 º C. For indoor and outdoor jobs. Suitable for high temperature environments. Magnetic. Surface Finish: Machined and lightly greased / oiled.

Chemical properties

MaterialASTMCMnPSCrSiMoNiVCuAlTiTaCoB
17-7 PH A693

.09

1

.04

.03

17

1

*

7.1

*

1.1

*

*

*

*

*

718 B637

.08

.35

.015

.015

19

*

3

52.5

*

.03

.05

.09

5.1

1

.006

H-13 A681

.35

.35

*

*

5

1

1.4

*

1

*

*

*

*

*

*

 

Physical properties

MaterialModulusYieldTemp. RangeFinishAvail. FinishMagnetic
17-7 PH

29,000,000

180,000

-400/550F

Deburred

Nickel

Yes

718

29,000,000

180,000

-400/1100F

Deburred

*

No

H-13

30,000,000

220,000

-250/1100F

Machined/Oil

Light Oil

Yes