Materials used


Cecchi srl uses cold drawn spring wire.

The stainless steel wire is specific for the manufacture of springs exposed to corrosive agents and slight temperature increases. Although stainless steel has a certain degree of magnetic permeability.

Below the specifications of the three listed materials

-AISI 302 stainless steel EN 10270-3

-AISI 316 stainless steel EN 10270-3

-Carbon steel EN 10270-1 class DH



AISI 302 stainless steel wire


Chemical composition, % by mass:

C
Si
Mn
P
S
Cr 
Mo
Ni
N
0.05-0.15
2.0 max
2.0 max
0.045 max
0.015 max
16.0-19.0
0.80 max
6.0-9.5
0.11 max

Density
 Modulus of Elasticity E
 Shear Modulus G
 Operating Temperature
8.0 Kg/dm3
185 KN/mm2
73 KN/mm2
-200 +250°


Tensile strength:
Wire Diameter
 N/mm2
1.50 < d ≤ 1.75
1750-1900
≤ 0.2
2200-2350

1.75 < d ≤ 2.0
1700-1850
0.2 < d ≤ 0.3
2150-2300

2.0 < d ≤ 2.5
1650-1750
0.3 < d ≤ 0.4
2100-2250

2.5 < d ≤ 3.0
1600-1700
0.4 < d ≤ 0.5
2050-2200

3.0 < d ≤ 3.5
1550-1650
0.5 < d ≤ 0.65
2000-2150

2.5 < d ≤ 4.25
1500-1600
0.65 < d ≤ 0.8
1950-2100

4.25 < d ≤ 5.0
1450-1550
0.8 < d ≤ 1.0
1900-2050

5.0 < d ≤ 6.0
1400-1500
1.0 < d ≤ 1.25
1850-2000

6.0 < d ≤ 7.0
1350-1450
1.25 < d ≤ 1.5
1800-1950

7.0 < d ≤ 8.5
1300-1400



AISI 316 stainless steel wire


Chemical composition, % by mass:

C
Si
Mn
P
S
Cr
Mo
Ni
N
0.07 max
1.0 max
2.0 max
0.045 max
0.015 max
16.5-18.5
2.0-2.50
10.0-13.0
0.11 max

 

Density
 Modulus of Elasticity E
 Shear Modulus G
 Operating Temperature
8.0 Kg/dm3
180 KN/mm2
71 KN/mm2
-200 +250° C

 



Tensile strength:
Wire Diameter N/mm2

1.50 < d ≤ 1.75
≥ 1450
d ≤ 0.2
≤ 1725

1.75 < d ≤ 2.0
≥ 1400
0.2 < d ≤ 0.3
≥ 1700

2.0 < d ≤ 2.5
≥ 1350
0.3 < d ≤ 0.4
≥ 1675

2.5 < d ≤ 3.0
≥ 1300
0.4 < d ≤ 0.5
≥ 1650

3.0 < d ≤ 3.50
≥ 1250
0.5 < d ≤ 0.65
≥ 1625

2.5 < d ≤ 4.25
≥ 1225
0.65 < d ≤ 0.8
≥ 1600

4.25 < d ≤ 5.0
≥ 1200
0.8 < d ≤ 1.0
≥ 1575

5.0 < d ≤ 6.0
≥ 1150
1.0 < d ≤ 1.25
≥ 1550

6.0 < d ≤ 7.0
≥ 1075
1.25 < d ≤ 1.5
≥ 1500

7.0 < d ≤ 8.5
≥ 1050



Carbon steel EN 10270-1 classe DH


Wire for compression, tensile or torsion springs subject to high static stress or medium level dynamic stress.


Chemical composition, % by mass:

C
Si
Mn
P
S
Cu
0.45 - 1.00 0.10 - 0.30
0.50 - 1.20 0.020 max
0.025 max 0.12 max

 

Density
 Modulus of Elasticity E
 Shear Modulus G
 Operating Temperature
7.85 Kg/dm3
206 KN/mm2
81.5 KN/mm2
-30 +100° C

 



Tensile strength:
Wire Diameter N/mm2

Wire Diameter
 N/mm2
0.3
2660-2940
1.2
2170-2400
0.4
2560-2830

1.3
2140-2370
0.5
2480-2740
1.4
2110-2340
0.6
2410-2670
1.5
2090-2310
0.7
2360-2610

1.6
2060-2290
0.8
2310-2560

1.7
2040-2290
0.9
2270-2510

1.8
2020-2240
1.0
2230-2470

1.9 2000-2220
1.1
2200-2430

2.0 1980-2200