Stainless Steel ER 630 (17-4PH)

Technical Data Sheet


Chemical Composition Limits
Weight% C Mn Si Cr Ni S P Mo Cu Cb+Ta
ER 630 (17-4 PH) 0.05 max 0.25-0.75 0.75 max 16.0-16.75 4.5-5.0 0.03 max 0.03 max 0.75 max 3.25-4.00 0.15-0.30

Alloy ER 630 (17-4PH) is a precipitation hardening stainless steel used for welding of materials of similar chemical composition. Mechanical properties of this alloy are greatly influenced by the heat treatment.

Typical Mechanical Properties

Material Ultimate Tensile Strength Offset Yield Strength 0.2 % Elongation (%)
psi MPa psi MPa
ER 630 143,550 990 123,250 850 10

Alloy ER 630 (17-4PH) is a Stainless Steel TIG, MIG and SUB-ARC wire used for welding. For all stock availability contact Sales.

AWS 5.9
AWS ER 630
UNS S17480

Return to Main Welding Page

At Aircraft Materials all stock items can be shipped out within 24 hours, usually within the same day. Even cutting orders for bar or sheet can be processed and dispatched the same day, and for time-critical situations such as AOGs, we have a dedicated AOG service desk ready to help (

Thanks to our global logistics network we can source from anywhere in the world in just a few days. We use a range of transport partners to enable us to ship overnight within the U.K. and Europe and provide fast shipping solutions to the rest of the world. If your requirement is urgent we can offer a priority shipping service, but also if time is not so critical we can offer more cost-effective options to ensure you get the best value for money. 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.

Sell your Stock Online at