Pure Iron

Pure iron is the earliest and commonly used pure metal soft magnetic material. Pure iron is referring to the low-carbon steel with a purity of over 99.85% iron and a maximum carbon content of 0.04%. In addition to the excellent steel cleanliness, pure iron also has many distinctive characteristics including outstanding corrosion resistance, admirable hot/cold forming capability, low smelting cost and suitable for all types of welding. As an electromagnetic material, pure iron possesses relatively high saturated magnetization Bs and maximum permeability μmax, low coercivity Hc, steady magnetic properties and good DC soft magnetic properties. Therefore, pure iron is mainly used to produce iron core and magnetic pole of an electromagnet; magnetic circuit of an electric relay and speaker; various parts for induction type and electromagnetic type measurement instruments; and magnetic pole to guide magnetic flux in the motor.

Pure iron

Electromagnetic Properties of Pure Iron

Grade Coercivity Hc

(A/m)

 Maximum permeability μmax

(mH/m)

 Magnetic flux density B

(T)
B200 B300 B500 B1000 B2500 B5000 B10000
DT4 ≤96.0 ≥7.50 1.20 1.30 1.40 1.50 1.62 1.71 1.80
DT4A  ≤72.0 ≥10.00
DT3E  ≤48.0 ≥12.50
DT4C  ≤32.0 ≥15.00
DT8  ≤96.0 ≥7.50 – – 1.40 1.50 1.62 1.71 1.80
DT8A  ≤72.0 ≥8.75
DT9E  ≤64.0 ≥17.50 – – 1.50 1.57 1.64 1.71 1.80
DT9C  ≤40.0 ≥18.75
Notes:

  1. The grades of pure iron are generally specified by letter DT + number + letter. Letter D and N stand for the first letter of electrical engineering and iron in Chinese Pinyin, respectively. The number that follows represent the code name. There is one letter tagged on the end determine the degree of electromagnetic performance. A, E and C stand for advanced, premium and super, individually.
  2. B200, B300, B500, B1000, B2500, B5000 and B10000 indicate the magnetic flux density when the magnetic field strength is 200A/m, 300A/m, 500A/m, 1000A/m, 2500A/m, 5000A/m and 10000A/m, separately.