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1.4412 / SS440B

When tempering 440B a Rockwell hardness of 58 HRc can be obtained. Temper for at least one hour. Tempering above 400°C is not recommended as this can cause a reduction in corrosion resistance and impact properties.

1.4112 X90CrMoV18 ASTM A276 UNS S44003 AISI


Analysis
Carbon0.75-0.95%Chromium16.00-18.00%
Manganese1.00% maxSulphur0.030% max
Silicon1.00% maxPhosphorous0.040% max
Molybdenum0.75% max


Form of Supply

TISCO Steel are suppliers and stockholders of round bar. Diameters can be sawn to your required lengths as one offs or multiple cut pieces. We also offer 440B flat cut from large block. Pieces can be bandsaw cut to flat and square sections to your bespoke sizes. 440B ground steel bar can be supplied, providing a high quality precision bar to tight tolerances.





FlatDiameter

Applications

Suitable for applications requiring a combination of excellent wear resistance with moderate corrosion resistance. 440B stainless steel is commonly used in the oil, gas, marine, food and medical industries. Typical applications include valve components, knives, bearings, surgical tools and cutlery.


Forging

Heat slowly and uniformly to 1180°C, allowing sufficient time for the steel to become heated through. Be careful not to overheat as this can cause a loss of toughness and ductility. Do not forge below 1010°C reheating if necessary. After forging cool slowly in furnace or thermoinsulating material, then anneal immediately. Air cooling after forging 440B may cause cracking.


Annealing

Heat uniformly to 840-875°C. Soak and cool very slowly in the furnace.


Hardening

Heat the 440B to 1010-1070°C, fully soak and quench in warm oil or air cool. Be careful not to overheat or full hardness will not be obtained.


Tempering

When tempering 440B a Rockwell hardness of 58 HRc can be obtained. Temper for at least one hour. Tempering above 400°C is not recommended as this can cause a reduction in corrosion resistance and impact properties.
 

Temperature [°C]150200250300350
Hardness [HRc]5856545354

Heat Treatment

Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult your heat treatment provider for full guidance on heat treatment of 440B stainless steel.


Typical Mechanical Properties*
Temp
°C
Tensile (UTS)
N/mm²
0.2% Yield
N/mm²
Elongation
(50.8mm) %
Hardness
HRc
Reduction
of Area
201930186035415


(*hardened at 1040°C, oil quenched and tempered at 250°C) 


Certification

Stainless steel 440B grade is available with BS EN 10204 3.1 mill certificate, please request when placing any orders.


Quality Assured Supply

440B stainless steel is supplied in accordance with our ISO 9001 : 2008 registration.


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