Stainless spring wire AISI 302

Stainless spring wire AISI 302

DESCRIPTION

Wire AISI 302 is austenitic stainless steels characterized by moderate tensile strength, high corrosion resistance and moderate fatigue and relaxation resistance. Service temperature: -200 to 250°C (-330 to 480°F).


PRODUCT STANDARDS

AISI 302

DIN 1.4310

EN X 10 CrNi 18-8 NS


CHEMICAL COMPOSITION (%)

CSiMnPSCrNiMo
0.080.601.200.0300.01517 - 198.00 - 9.50< 0.80

FORMS OF SUPPLY

Coated: 0.20 - 12.00

Polished: 0.80 - 2.00

Bright: 0.20 - 1.30


DELIVERY FORMS

0.20 - 0.60 (spool 20 / 40 kg)

0.60 - 1.30 (coil 50 kg)

1.40 - 12.00 (coil 100 / 150 kg)


SHEAR MODULUS, MPa (ksi)

As delivered ~71000 (10295)

Tempered ~73000 (10585)


MODUL OF ELASTICITY, MPa (ksi)

As delivered ~185000 (26825)

Tempered ~190000 (27550)


PHYSICAL PROPERTIES

Density g/cm3 - 7.90

Specific heat capacity - 500 J / (kg * ⁰C), 50-100 ⁰C

Permeability, μmax ~10


THERMAL CONDUCTIVITY / RESISTIVITY (W/м ⁰C | μΩм ⁰C)

Temperature 20 °C (15 | 0.80)

Temperature 100 °C (16 | 0.85)

Temperature 200 °C (18 | 0.90)

Temperature 300 °C (19 | 0.95)


THERMAL EXPANSION x (10⁻⁶), W/м ⁰C

Temperature 20-100 °C (17.0)

Temperature 20-200 °C (17.5)

Temperature 20-300 °C (18.5)


HEAT TREATMENT

By tempering springs at 350°C (660°F)/0.5–3 h, the tensile strength will increase by about 100-250 MPa (15 - 35 ksi). If a shorter tempering time is used the tempering effect will be lower. In continuous conveyor furnaces, where the holding time at temperature is very short (min. 3 minutes), the temperature can be increased to about 425°C (780°F). In the 'as delivered' condition, the ratio proof strength/tensile strength is about 0.80. After tempering the ratio will be about 0.85. Please note that tension springs coiled with initial tension must not be tempered at the same high temperature as other types of spring. We recommend batch annealing at 200°C (390°F)/0.5–3 h, or continuous tempering in a conveyor furnace with a holding time of 3–20 minutes at about 250°C (480°F).



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