Corrosion Resisting Alloy AMS 5630/5618

Technical Data Sheet


Chemical Composition Limits
Weight% C Si Mn P+S Cr Mo Ni Others
0.95/ 1.2 1.0 max 1.0 max 0.04 P
0.03 S
16.0 / 18.0 0.75 - -
AFNOR Z100 CD 17 0.90/ 1.2 1.0 max 1.0 max 0.04 P
0.03 S
16.0 / 18.0 0.35 / 0.75 0.50 max Cu 0.50 max
AMS 5630 / 5618 0.95/ 1.2 1.0 max 1.0 max 0.04 P
0.03 S
16.0/ 18.0 0.4/ 0.65 0.75 max Cu 0.50 max
WS 1.4125

0.95/ 1.2 1.0 max 1.0 max 0.04 P
0.03 S
16.0/ 18.0 0.40 / 0.80 - -

AISI 400C is available in either standard melted (ams 5630) or vacuum melted (ams 5618) versions. AMS 5618 is typically used for anti-friction bearing components where resistance to both corrosion and wear is essential. 440C is capable of hardnesses in excess of 58 HRC after heat treatment.

AMS 5630 is available in Bars, Wire and Forgings. For all stock availability contact Sales.

UNS S44004, UNS S44002, UNS S44020
FED QQ S 763
AMS 5631
AMS 5632

At Aircraft Materials we specialise in the rapid turn-around of orders, with most stock items ready for shipping out the same day to anywhere in the world. For time-critical orders, such as AOGs use our AOG service desk (, the team are dedicated to processing and dispatching orders on the same day, even for cutting orders on bar and sheet products.

Our expertise in global logistics enables us to source material from anywhere in the world in a matter of days and provide fast shipping solutions to all our customers, whichever country they are in. We use a range of transport partners to ship overnight within the UK and Europe, and offer a full range of logistics solutions from priority express services to more cost-effective economy shipments all around the globe. To find out more about our services click here.

Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.