IN 1.4418 stainless steel rod bar
l Descripition of DIN 1.4418stainless steel:
1.4418 is characterised by its very goodresistance to corrosion in aggressive media coupled
with very good mechanical and impactproperties.DIN 1.4418 stainless steel is a martensitic stainless steelspecially designed for those applications requiring high mechanical propertiescombined with improved corrosion resistance relative to traditional martensiticsteels.
DIN 1.4418 stainless steel is also offeredas an enhanced machining variant, DIN 1.4418 EM stainless, which obtains anenhanced machinability characteristic through controlled addition of sulfurwithout degrading strength or corrosion resistance. DIN 1.4418 stainless steelcontains differentiated micro constituents for easier machining production.
l Applications of DIN 1.4418stainless steel:
For any application requiring highstrength,high hardness, and corrosion resistance similar to 304 stainless. Manyapplications can be found in fields like automotive,industrial, andothers,where a combination of high mechanical properties and a good corrosionresisitance is critical. This alloy has been specified in pressurized fuelsystems for direct injected engines,fittings on fuel rails,fuel pumps,andinjector bodies.
DIN 1.4418 stainless steel can be used totemperatures around 550 °C, and it can be used in cryogenic applications
l Physical properties of DIN 1.4418stainless steel:
density (kg/dm3): 7.70
electrical resistivity at 20 °C (½ mm2/m):0.70
Magnetizability: yes
thermal conductivity at 20 °C (W/m K) :15
specific heat capacity at 20 °C (J/kg K) :430
thermal expansion (K-1) :
20 – 100 °C: 10.8 x 10-6
20 – 200 °C: 10.8 x 10-6
20 – 300 °C: 11.2 x 10-6
20 – 400 °C: 11.6 x 10-6
l Typical applications of DIN 1.4418stainless steel:
chemical industry
ship building
mechanical engineering
aviation and aerospace
Note: available from stock
diameters < ø 20 available on request
l Processing properties of DIN1.4418 stainless steel:
automated machining: seldom
Machinable: moderate
hammer and die forging: yes
cold forming: yes
cold heading: not common
suited to polishing: yes
l Conditions of DIN 1.4418 stainlesssteel:
annealed, quenched
l Corrosion Resistance of DIN 1.4418stainless steel:
Due to its higher alloy content, 1.4418 ismore resistant to corrosion than 1.4057 and the
addition of molybdenum allows limitedexposure to marine environments. As a result of its
chemical composition and microstructure,1.4418 is extremely resistant to intergranular corrosion,
corrosion fatigue and stress corrosioncracking.
l Heat treatment and mechanical propertiesof DIN 1.4418 stainless steel:
1.4418 can be soft annealed by holding at atemperature of approximately 600 °C (but not in
excess of 625 °C), followed by slow coolingin air. In this condition, the following mechanical
properties can be expected:
Property: Specification
tensile strength (N/mm2): Rm ²: 1100
Hardness: HB ² :320
1.4418 can be hardened by holding at atemperature between 1000 °C – 1050 °C followed by
cooling in air, oil or polymer.
l Welding of DIN 1.4418 stainlesssteel:C m0
1.4418 is readily weldable using allstandard welding techniques. Care must however be taken
to ensure that hydrogen or carboncontaining gasses are not used when welding under shielded
gas. Pre-heating of the work piece to atemperature between 100 °C and 200 °C is recommended. After welding, theweldment should either be annealed or tempered, as described before. If a fillermaterial is required, then either a matching filler or Novonit® 4430 should beused.
l Forgingof DIN 1.4418 stainless steel:
Care should be taken when forging 1.4418,since gradual heating to a temperature of about
800 °C is recommended prior to more rapidheating to a temperature of between 1150 °C and
1180 °C. Forging should then take placebetween 1180 °C – 950 °C followed by cooling is an
oven or in dry ash or similar material topromote slow cooling.
l Machiningof DIN 1.4418 stainless steel:
The machinability of this grade ofstainless steel is directly related to its hardness. 1.4418
machines similar to carbon steels of thesame hardness. Although it must be realised that the
machining parameters will vary depending onthe heat treated condition and hardness of the
steel, the following parameters can be usedas a guideline:
