E7-UM-250-K Hardfacing Flux Cored Wire
250 HB as-welded, work-hardens to 500+ HB.
DIN 8555 / EN 14700.
Get a factory quote today.
What is E7-UM-250-K?
E7-UM-250-K Hardfacing Flux Cored Wire is a self-shielded,tubular welding consumable engineered for the rebuilding and hardfacing of austenitic manganese (Hadfield) steel components subjected to severe impact and metal-to-metal wear.The designation follows the German DIN 8555 hardfacing standard,where each segment carries a precise technical meaning:
| Segment | Meaning |
|---|---|
| E | Coated stick electrode / welding filler classification |
| 7 | Alloy group - austenitic 11–18 % Mn with >0.5 % C, up to 3 % Ni; designed for wear plates, jaw plates, digging teeth and bolts |
| UM | Umhüllt - coated / tubular (flux-cored) filler form |
| 250 | Hardness class - deposit hardness HB 225–275 (≈ HRC 22–28) in the as-welded condition |
| K | Work-hardenable (kaltverfestigend) - hardness rises to HB 450–550 (≈ HRC 45–52) after cold plastic deformation under service load |
Under the current European standard EN 14700, this type of alloy is classified as T Fe9.In North America, the closest AWS equivalent is AWS A5.13 EFeMn-A / EFeMn-B; this is a functional (rather than chemical) equivalent,as there is no strict one-to-one correspondence for work-hardening manganese-based surfacing consumables within the AWS standards.
Why choose E7-UM-250-K Hardfacing Flux Cored Wire?
Unlike fixed-hardness overlays that crack under impact,the E7-UM-250-K deposit stays tough and ductile in the as-welded state,then hardens progressively as the wear surface is pounded in service.This makes it the industry-standard filler for:
- Restoring Hadfield manganese steel components to their original dimensions
- Serving as a buffer or transition layer beneath a high-hardness chromium carbide overlay
- Hardfacing repair of railway switches,crusher jaw plates,and mill hammers
Manufactured by OCEAN WELDING in strict accordance with ISO 9001 quality control standards.
Technical Specifications
Chemical Composition of All-Weld Metal (typical, wt %)
| Item | C | Cr | Mn | Fe |
| Min | 0.5 | 13 | 16 | |
| Max | 0.6 | 15 | 18 | Bal. |
Mechanical Properties of All-Weld Metal (typical)
without heat treatment; minimum values at ambient temperature
| Hardness | 250 [HB] |
| 450 [HB]workhardened |
Positions:PA , PB (PC)
Redrying:300℃/2h
Typical Applications
The E7-UM-250-K hardfacing flux-cored wire is widely used across five major industries characterized by severe wear, and is suitable for operating environments involving austenitic manganese steel and high-impact conditions.
Mining and Quarrying: Jaw crusher stationary and swing jaws; cone crusher concave liners and mantle liners; impact crusher blow bars and hammers; excavator and loader bucket teeth, adapters, and lip shrouds; chute liners, hopper walls, and apron feeder pans
Cement, Aggregates, and Lime: Vertical mill grinding rollers and tables (buffer layer prior to chromium carbide hardfacing); roller press sleeves; hammer crusher rotor discs and hammers; fan blades and air separator wear liners
Railways and Heavy-Haul Rail: 14% manganese steel (Hadfield steel) railway switch frogs and switch points; heavy-haul freight car wheel repair; guard rails at high-wear curves
Earthmoving and Construction Equipment: Bulldozer blades, ripper shanks, and side cutters; motor grader blades; Tunnel Boring Machine (TBM) cutterhead housings and muck removal equipment
Iron, Steel, Foundry, and Recycling: Coke oven pusher rams and quenching car components; scrap shear blades; waste-to-energy plant crusher hammers and grate bars; slag pot rims and covers
FAQ
Q: What are the most suitable applications for E7-UM-250-K?
A: It is best suited for austenitic manganese steel components subjected primarily to impact-induced wear-such as crusher hammers and jaw plates, mill rollers, railway switches (frogs), bucket teeth, hammer crusher anvils, and dredge cutter heads-as well as for use as a buffer or transition layer beneath high-hardness chromium carbide hardfacing deposits.
Q: What is the corresponding AWS classification for E7-UM-250-K?
A: The closest AWS equivalent is AWS A5.13 EFeMn-A or EFeMn-B. This represents a functional equivalent rather than a strict match in chemical composition; please be sure to verify the chemical composition against the project's Welding Procedure Specification (WPS).
Q: Is the E7-UM-250-K a self-shielded or gas-shielded welding wire?
A: Our standard product is the self-shielded type (FCAW-S / open-arc welding); it requires no shielding gas and is ideal for outdoor operations and on-site repairs. A gas-shielded version (FCAW-G)-using CO₂ or an 80% Ar / 20% CO₂ gas mixture-is available upon request.
Hot Tags: e7-um-250-k hardfacing flux cored wire, China, manufacturers, suppliers, factory, company, wholesale, discount, buy, low price, high quality, products
Previous
No InformationYou Might Also Like
Send Inquiry