AISI 431 / W.Nr. 1.2787 ESR stainless steel round bar for glass molds
1.2787 ESR is a hardenable stainless steel containing 16 % chrome and 2 % nickel. In the hardened and tempered condition
* good corrosion resistance
* good wear resistance
* good polishing ability
* Good oxidation resistance
Chemical compositon ( typical weight % )
SEP 1921 C/c, D/ d, E/e or meet customers' request
Physical properties ( average values ) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 216
Density [g/cm3]: 7.70
Thermal conductivity [W/m.K]: 25.0
Electric resistivity [Ohm mm2/m]: 0.70
Specific heat capacity[J/g.K]: 0.46
Modulus of Elasticity [103 N/mm2]
Coefficient of Linear Thermal Expansion 10-6 oC-1
Heat to 660-750oC, cool slowly in furnace.
This will produce a maximum Brinell hardness of 295.
Harden from a temperature of 980-1030oC followed by oil or air quenching.
Hardness after quenching is about 47 HRC.
Tempering temperature: For Q T 800: 750-800oC. For Q T 900: 600-650oC.
Hot forming temperature: 1100-800oC, slow cooling.
In the fully annealed condition, 431 will gall and build up on the tools.
Good surface finishes are not easily obtained.
431 is superior to all other martensitic grades in terms of corrosion resistance.
Will resist dilute acids and alkalis, neutral and basic salts, food acids, fresh water and atmosphere.
Most electric welding procedures have proven successful with 431 stainless. Filler metal should be AWS E/ER410.
To avoid cracking, pre-heat the workpiece to 204-316oC.
After air cooling, treat at 649oC to reattain maximum properties.
Embittlemnt: It must be in mind that the temperature range between 425 and 525oC must be avoided owing to embritllement
This alloy is easily drawn, spun, headed, sheared and bent compared with other stainless steels.