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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).
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
|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|
|Version||Hardness||Yield Strength||UTS||Elongation||Charpy V 2)
standard 10×10 specimen 3)
|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 .