Soft Iron Base Alloys
Soft-Iron Base Alloys
Soft magnetic alloys are ferromagnetic materials that are easily magnetized and de-magnetized. To provide
optimal magnetic performance, these alloys possess very low levels of carbon, nitrogen, and oxygen.
They rely on various additions of phosphorus, nickel, and silicon to optimize magnetic induction, permeability,
and coercive force. The magnetic properties of all of these alloys benefit from high temperature sintering (HT)
above 2200 F (1200 C) in hydrogen, as compared to the standard PM sintering process (ST) in metal mesh
belt furnaces at nominally 2050 F (1120 C). Density and grain size increases, while residual levels of carbon,
oxygen, and nitrogen are reduced. Typical applications include tone wheels, relays, cores, sensor probes,
armatures, solenoid components, and pole pieces.
SUY-1 is a soft steel with ultra-low carbon and low impurities.
The grade is defined in the standard, “JIS C 2504 Soft Magnetic Iron,” and is generally referred to as “pure iron.”
There are four SUY grades from SUY-0 to SUY-3. The suffix indicates the material’s magnetic properties with
grade 0 providing the best magnetic properties.
SUY-1 has less carbon content and lower impurities than carbon steel. It also features good drawability and
good properties as a soft magnetic material. SUY-1 is mainly used in motor applications, but is recently being
used more and more as magnetic shielding.
It has high flux density and coercive force, and these magnetic properties can be maximized if the material is
re-subjected to magnetic annealing after the cold-rolling process.
High purity soft iron suitable for the manufacture of frames, yokes, armatures, cores etc in telephone relays,
solenoids, magnetic clutches, magnetic brakes and all stationary parts of magnetic circuits carrying a direct flux.
Many other applications in the electrical and electronic equipment industry.
Also used for Sacrificial Anodes, for example in the protection of condensers and pumps for the electricity
generation and shipping industries and in water de-salination plants.
Whilst strategic stock sizes are held, semi finished material is always available to enable further processing to
satisfy individual customer requirements.
Heat Treatment
The heat treatment required to produce these typical electromagnetic properties, consists of full annealing from
920ºC (ie 920º C soak, furnace cool at 50º C/hour max to 600º C, furnace cool to room temperature).
In order to avoid scaling, this treatment should be carried out in a neutral or slightly reducing atmosphere.
Typical hardness after annealing 95-110 B.H.N. Annealing is normally done after any significant machining work,
but can be arranged on request.
Electromagnetic Properties
Normally conforming to MoD specifications DTD 5092 and DTD 5102, which although obsolete, are commonly
used as a basis for the typical electromagnetic properties which are expected to be achieved following the
annealing process.
In order to develop the optimum electromagnetic properties, the material must be subjected to the above
annealing treatment, preferably after rough machining.
ELECTRICAL AND MAGNETIC
PROPERTIES
The purity of a metal determines its electrical conductivity. This is why materials that are as pure as possible are
used for all conducting parts. Electrical conductivity is affected even by very low proportions of C, Si, P, S, Mn and Cu,
and these proportions are higher in the usual commercial grades of steel. PURE IRON FE, on the other hand,
is sure to provide significantly better conductivity than other soft, unalloyed types of steel. Experience has shown that
the specific resistance of PURE IRON FE, at 20° C temperature of the material, is ≈ 0.11 Ohm x mm²/m. Because of its
high magnetic permeability, PURE IRON FE is also a material of choice for DC magnetisation of solid parts.
It has a saturation of approx. 21,000 Gauss, and can thus be used wherever maximum induction is required.
Particularly noteworthy characteristics of the pure and soft PURE IRON FE are its high permeability and very low coercive force.
It also has outstanding magnetic properties, such as high magnetic saturation, low coercivity, high permeability,
as well as excellent conductivity, especially in medium induction ranges.
Each cold working process leads to stresses in the microstructure of the material, and thus to a deterioration of its
magnetic properties. That is why finished parts generally need to undergo annealing when they are in final form.
You will find an example on the following pages. However, our experience shows that PURE IRON FE reaches the
magnetic values required by customers even without a final annealing in various applications. This is due to its
high grade of purity. Precise values for specific applications can be demonstrated in experiments.
The following values should be taken as guidelines:
Initial permeability: 300-500, Max. permeability: 2.000-20.000, Coercive force: 15-160 A/m, Saturation induction: 2.15 T.
APPLICATION CHARACTERISTICS
Corrosion
The purer the iron, the greater its resistance to electrolytic self-destruction, which occurs at the interfaces between the
iron crystals and the accumulated alloying elements.
Chemical interactions
PURE IRON FE is partially resistant to acids, bases, and salt solutions, which react with the element Fe.
Although PURE IRON FE cannot completely replace other rust- and acid-resistant materials, it offers advantages
where certain chemical degradation of unalloyed metallic materials is acceptable. Compared to unalloyed steels,
the homogeneous structure and high purity of PURE IRON FE makes it more resistant to many corroding chemicals.
Oxidation
he purer the iron, the better its oxidation behavior (scaling). It plays a major role particularly in thermal processing and
other thermal applications. Oxidative scaling not only prevents the transfer of heat; it also has a destructive effect by
reducing the thickness of the material.
PURE IRON FE features increased resistance due to its firmly adhering, protective layers of scale.
FROM ELECTROMAGNETIC APPLICATIONS UP TO HARDENING
Because of its 99,9% pure iron PURE IRON FE can be used in a large scope of application. From high-technology
up to various handcrafts.
MACHININGTurning
PURE IRON FE can be machined using both high-speed steel tools and carbide tools. It is extremely important that
the tools are sharpened and the cutting data is carefully selected, otherwise PURE IRON FE will lubricate. Small feed
rate and deep cutting will ensure most efficient rough turning. With fine turning, the feed rate should not exceed 0.1 mm
if optimal surface quality and dimensional accuracy are required. When cutting data is properly selected, the turned
surface appears bright; otherwise it is matt. Extremely fine-grained cutting surface is also important. Tip: Generous
cooling and lubrication are essential to protect the tool and the workpiece. It is recommended to use a mineral oil
with 1-1.5% sulphur and 5% grease.
Milling
For a fine surface, use hobbing cutters with lead angles of 45-52°. Radial rake angle: 30°. For optimal cutting speed
of 25 – 45 m/min at 19 – 32 mm/min feed rate. Radial rake angle when working with side milling cutters: 10°. Tip: Check
that the clearance hole of the tools is correct. For cooling and lubricating, observe the same instructions as for turning.
Drilling
Generally, high-speed steel drills with an acute angle of 100° provide satisfactory results. Lead angle at the cutting
edge: approx. 12°. Cutting speed 20-30 m/min at a feed rate of 0.02-0.1 mm/revolution.
Threading
Tip: Select a slightly larger core diameter of the thread than usual. This will greatly reduce the risk of taps breakage,
and ensure a clean thread. Non-cutting thread forming is recommended. Rake angle: approx. 15-20° Cutting speed: 4 6 m/min.
NON-CUTTING PROCESSING
Non-cutting forming
Due to its mechanical properties, PURE IRON FE offers exceptional advantages in cold working with a high degree of
deformation. During there is minimal compressive stress and resistance to deformation. That ensures high levels of deformation.
With a controlled deformation, the tensile strength can reach twice the initial value.
Tip: Hot working by rolling, forging, bending, flanging, and pressing must not take place in the red-short area from 850 to 1.050°.
Inspection & Approval Certificates : C/W Certificate (Calibration Works Certificate) EN 10204 3.1 / DIN 50049 3.1 / ISO 10474 3.1 Mill Test Certificate,
NACE HIC TM-0284 / NACE MR-0103 / NACE MR-0175 / ISO 15166, BS EN 9001, BS EN 9100, AS 9100D, IATF 16949, NADCAP Certified, CE Marked,
European Pressure Equipment Directive PED-2014/68/EU, AD-2000-WO, ASME Boiler & Pressure Vessel Code Section-II Part A Edition 2019,
API 6A (American Petroleum Institute), with 3.2 Certificate duly Certified & Approved by IBR (Indian Boiler Regulations), LR Class (Lloyd’s Register),
GL (Germanischer Lloyd), BV (Bureau Veritas), DNV (Det Norske Veritas), ABS Class (American Bureau of Shipping), SGS, TUV, RINA,
IR Class (Indian Register of Shipping), NORSOK Approved Standard M-630, M-650 Rev.3 For Ministry of Defence, DRDO, Indian Ordnance Factory,
Heavy Vehicle Factory, Bharat Electronics Limited (BEL), Hindustan Aeronautics Limited (HAL), Mishra Dhatu Nigam Limited (MIDHANI),
Bharat Dynamics Limited (BDL), Indian Navy (NAVAL), Mazagon Dock Shipbuilders Limited (MDL), Aerospace, Aviation, Electric Vehicles,
Armour Vehicle, Armor Vehicle, Automotive, Automobile, Railways, Medical Equipments, Military Missiles, Energy, Power Sector, Electronics
If you have any requirement of above items, please feel free to contact us
Regards,
CONTACT PERSON :
MUKESH SHAH
Director
Mobile No. 0091 – 9820292499
Email – marketing@rolexmetals.com
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