We use default:

patented drawn spring steel wire according to quality standard DIN EN 10270-1 in models SH and DH

(Formerly DIN 17223-1 C and D - material no 1.1200.)

foreign names: F: AFNOR NFA 47-301-76 / UK: BSI BS 5216-75 / USA: AISI AMS 5112

Chemical analysis according to type and wire size in%

C 0.35 to 1.00 / Si 0.10 to 0.30 / M 0.50 to 1.20

P max. 0.035 / S max. 0.035 / Cu max. 0.20

Tensile strength N / mm ² 1570 - 3110 (d 6.30 to 0.20 mm) ~ (150kp Rockwell Rc 47 -  > 69 / / Brinell (Hb) / Vickers (Hv) ~ 445 -  > 740/850

Shear modulus of 81500 N / mm ²

Finish: matte gray to bluish according to age, no plating

Temperatures: Temperature range: max. 80 ° C annealing temperature: 250 - 350 ° C (280 ° C)

most common grade for springs

more surface forms: tin, zinc, rhodium, copper, silver plated, gold plated, chrome plated with us possible only through external galvanic surcharge.

 

further processed in our wires (unalloyed, low-alloy):

DIN EN 10270-2-VDSiCr, valve spring wire, max. Operating temperature 120 ° C

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