Mars® 440 – Data

Mars® 440: Medium hardness Armor

Mars® 440 is a protection steel intended to be used as vehicle structures for protection against mines and IED. It offers optimal compromise in terms of hardness (typical 440 HBW), toughness, and ductility for resistance against blast loads and fragments, while keeping an excellent workability, especially bending and welding, for building specific vehicle profiles used for blast protection (example: V-shaped floor).

Standards

Mars® 440 can be ordered according to one of the following standards:

INDUSTEEL: Mars® 440

• France : NF A36-800 THD1
• USA : MIL-DTL-12560 Class 4a  & 4b

Chemical analysis

Version Available Th range C S P Si Mn Ni Cr Mo B
Liquid quenched (4a) 4 to 50 mm ≤ .22 ≤ .002 ≤ .015 ≤ .5 ≤ 1.5 ≤ 2.0 ≤ 1 ≤ .6 ≤ 0.003
Air hardened (4b) 20 to 70 mm ≤ .24 ≤ .002 ≤ .015 ≤ .5 ≤ 1.5 ≤ 5 ≤ 2 ≤ .6 ≤ 0.003

Mechanical properties (In both directions)

Version Hardness Yield Strength UTS Elongation Charpy V 2)
@-40°
standard 10×10 specimen 3)
HB MPa MPa 5d(%) J ft.lbs
Liquid quenched (4a) Guarantees 420 – 470 ≥1100 ≥ 1250 ≥ 10 ≥ 27 ≥ 20
Liquid quenched (4a) Typical values 440 1150 1450 13 48 35
Air hardened (4b) Guarantees ≥390 ≥800 ≥1200 ≥10 ≥20 ≥15
Air hardened (4b) Typical Values 400 900 1300

2) Average of 3 tests. Single value min 70% of specified average.
3) For nominal thicknesses under 11mm, sub-size specimens are used. The specified minimum value is then proportional to the specimen cross section.
Brinell hardness test according to relevant standard (EN ISO 6506-1 / ASTM E10/E110), on each plate and in two places, one at each end of a diagonal, on a milled surface 0,5 to 1mm below plate surface
Charpy Impact test according to relevant standard (EN ISO 148-1 / ASTM E23) on each heat and thickness from 6mm.
Tensile test according to EN ISO 6892-1, method B on each heat and thickness when specified in the standard or order.
Ultrasonic test is performed according to standard requirements or upon special agreement up to EN 10160 Class S3/E4 .

 

Mars® 440 – Data

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Technical data and information are to the best of our knowledge at the time of publication. However, they may be subjected to some slight variations due to our ongoing research programmes. Therefore, we suggest that information be verified at time of enquiry or order. Furthermore, in service, real conditions are specific for each application. The data presented here are for the purpose of description only, and can be considered as guarantees only when written formal approval has been provided by our company. Industeel reserves the right to change its product range at any time without prior notice.