Basic Info.

Model NO.

SF550

Origin

China

HS Code

7225400000

Model NO.

SF550

Origin

China

HS Code

7225400000

Product Desciption

Mechanical property
Grade	Thickness(mm)	tensile strength(MPa)	Elongation A(%)	Surface Brinell hardness(HBW)
NM300	≤80	≥1000	≥14	270-330
NM360	≤80	≥1100	≥12	330-390
NM400	≤80	≥1200	≥10	370-430
NM450	≤80	≥1250	≥7	420-480
NM500	≤70	-	-	≥470

Grade comparison
GB	NM300,NM360,NM400,NM450,NM500
SS	HARDOX400,HARDOX450,HARDOX500,HARDOX600
DIN	XAR400,XAR450,XAR500,XAR600,Dillidur400,Dillidur500
NBN	QUARD400,QUARD450,QUARD500
NF	FORA400,FORA500,Creusabro4800,Creusabro8000
JIS	JFE-EH360, JFE-EH400,JFE-EH500,WEL-HARD400,WEL-HARD500
SFS	RAEX400,RAEX450,RAEX500

Bulletproof material  
If you are new to the game, let's decode some of the types of steel armor. The AR stands for Abrasion Resistant and the 500 or 550 refers to Brinell hardness of the steel. These steel products are through hardened, meaning that this plate is as hard in the center as it is on the surface. This is important as a surface hardened product would not provide the needed ballistic protection. 
AR500 steel core armor plates are readily available from many manufacturers and they provide Level III protection. We have chosen not to carry this option because for just a very small increase in price AR550 Steel Armor provides you with Level III+ protection and will protect the user from numerous .556 projectiles that the AR500 fails to stop. There are AR600 and AR650 steel options, but the additional hardness makes it prone to cracking due to the inherent stress levels found in these steels after forming. The AR550 is at the perfect hardness level to provide exceptional ballistic coverage while allowing us to apply an ergonomic single press multi curve bend to the steel. 

Backface Deformation of Steel products

Steel product provides almost no backface deformation. Backface deformation is the protuberance on the backside of the steel that happens from a bullet striking the armor. Even if the bullet does not penetrate the steel it still causes some protrusion, and this is what is measured and is important to pay attention to. The NIJ allows a maximum of 44 mm to pass the Level III hard armor testing requirements. The most that happens with the steel armor is half of that amount. This allows you to also be protected from any kinetic energy that is transferred to the steel

How Much Does Steel Armor Weigh? 

you may be thinking that the AR550 steel armor plates are heavier than some other level III+ armor that is available, but it weighs only slightly more than the cheapest, but more expensive composite counterparts.
Unlike ceramic/composite products, steel cannot be damaged as easily. They have a much longer shelf life. 

Lastly, no body armor plate is bulletproof, only bullet resistant. It's important to narrow your search and think about what threats you are likely to encounter. You do not want to under prepare and not have the set up that fits your situation. 


Europe norm
NIJ
UL 

The most used bullet for rifle