Part Number WS 1.7139

Technical Data Sheet

Chemical Composition Limits
Weight % C Cr Mn Si P S Fe
EC-80 0.14-0.19 0.80-1.15 1.00-1.30 0.15-0.40 0.035 0.020-0.035 Rem
Other Chemically similar Specifications
Weight % C Cr Mn Si P S Fe
WS 1.7139 0.14-0.19 0.80-1.10 1.00-1.30 0.40 max 0.035 max 0.020-0.040 Rem
16MnCrS5 0.14-0.19 0.80-1.10 1.00-1.30 0.40 max 0.035 max 0.020-0.040 Rem
AISI 5115 0.14-0.19 0.80-1.15 1.00-1.30 0.15-0.40 max 0.035 max 0.020-0.035 Rem
16MC4 0.14-0.19 0.80-1.15 1.00-1.30 0.15- 0.40 max 0.035 max 0.020-0.035 Rem

Our EC-80 is Manufactured in Rod, Bar and coil (WS 1.7139 / AISI 5115 Case Hardening Steel). For all stock and size availability contact Sales.

Standard Stock size
From 1 to 20mm, in steps sometimes 0.1 to 0.5

Ø < 2.99 mm : high precision cold drawn and polished
Ø > 3.00mm: cold drawn, ground and polished, roughness N5-N6

Delivery form
In bars for automatic lathes of 3m (2m) lengths or in coils for ESCOMATIC machines

Standard ISO) h8, other close tolerance sizes available on request.

Tensile strength (Rm)
Standard 490-680 N/mm2

Heat Treatment
Case hardening, superficial hardening and heart hardening possible.
Hardening Temperature (heart): 850-880 ºC
Hardening Temperature (superficial): 810-840 ºC
Tempering Temperature: 170-210 ºC

Obtainable Hardeness
Approx 45 HRC depending on method used.

Cutting Rate
30 to 50 m/min (approx value, depending on the lubrication oil, the cutting tools, the shape of parts etc)

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.

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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.