EFeCr-A8 Hardfacing Electrode
Fe-Cr-C, HRC 58-62, M7C3 carbides.
For bucket teeth, crushers, cement rollers. MTC.
EFeCr-A8 High-Chromium Hardfacing Electrode
Ocean Welding EFeCr-A8 is a high-chromium iron-carbon (Fe-Cr-C) alloy hardfacing electrode designed for manual arc hardfacing applications on components subjected to severe abrasive wear and light-to-moderate impact. Compliant with AWS A5.13 EFeCr-A1 and GB/T 984 EDZCr-C-15 standards, the deposited metal contains 25%–32% chromium and 2.5%–5.0% carbon. It forms a dense, network-like structure of primary M7C3-type chromium carbides within an austenite-martensite matrix, achieving an as-welded hardness of HRC 58–62.
EFeCr-A8 is the industry-preferred single-electrode solution for hardfacing wear parts such as excavator bucket teeth, crusher hammers and jaw plates, cement mill rollers, mixing blades, agricultural plowshares, conveyor screws, and slurry pump components. It is available in diameters ranging from 3.2 mm to 5.0 mm and is sold directly by the manufacturer, accompanied by a material inspection certificate.
Comparison of Classifications and Standards
| Standard | Designation |
|---|---|
| Trade Code (this product) | EFeCr-A8 |
| AWS A5.13 / SFA-5.13 | EFeCr-A1 (Fe-Cr-C high-chromium cast iron) |
| ISO 14700 | T Fe15 |
| DIN 8555 | E10-UM-60-GR |
| JIS Z3251 | DFCrA-500 |
Product family: Iron-Cr-C · Hardfacing / Wear-surfacing · SMAW covered electrode
Applications and Industries
| Industry | Component | Wear mechanism |
|---|---|---|
| Mining & Crushing | Jaw & cone crusher jaws / hammers / liners | Severe abrasion + moderate impact |
| Cement | Vertical mill rollers, roller-press tyres, concrete-pump pipe | Abrasion + fatigue |
| Agriculture | Plow shares, rotary tiller blades, mulcher hammers | Soil / sand abrasion |
| Earth-moving | Excavator bucket teeth (with EFeMn-A buttering), bulldozer cutting edges | Impact + abrasion |
| Steel & Sintering | Sinter feeder blades, blast-furnace bell rings, ball-mill liners | High-temp abrasion (< 500 °C) |
| Petrochemical | Centrifugal cracker pump sleeves & liners | Abrasion + corrosion + cavitation |
| Power / Chemical | Slurry pump impellers, agitator blades, screw conveyors | Abrasion + corrosion |
Not recommended for use in the case of severe repeated impact under large ore feed conditions. First, use EFeMn-A / D256 austenitic manganese steel welding rods for the root pass (buffer layer) welding, and then use EFeCr-A8 welding rods for the wear-resistant surface layer welding.
Chemical Composition of All-Weld Metal (wt %)
| Element | GB/T 984 EDZCr-C-15 (spec) | AWS A5.13 EFeCr-A1 | OW-EFeCr-A8 typical |
|---|---|---|---|
| C | 2.50 – 5.00 | 2.0 – 5.5 | 3.40 |
| Cr | 25.00 – 32.00 | 24.0 – 33.0 | 28.85 |
| Ni | 3.00 – 5.00 | ≤ 5.0 | 3.80 |
| Mn | ≤ 8.00 | ≤ 3.0 | 3.50 |
| Si | 1.00 – 4.80 | ≤ 2.0 | 1.67 |
| Mo | 0 – 1.5 (optional) | – | 0.5 (optional grade) |
| Nb / V | 0 – 1.5 (optional, secondary MC carbides) | – | on request |
| P | ≤ 0.040 | ≤ 0.04 | 0.02 |
| S | ≤ 0.030 | ≤ 0.03 | 0.01 |
| Fe | balance | balance | balance |
Microstructure: Primary M7C3 chromium carbides (volume fraction of 30%–45%) with a hexagonal crystal structure are distributed within a mixed austenite/martensite matrix. The appearance of regular stress-relief cracks on the surface of the weld overlay is a normal phenomenon. These cracks can release thermal stress and will not propagate into the base material.
Mechanical and physical properties
| Property | Value |
|---|---|
| As-welded hardness (3 layers, undiluted) | HRC 58 – 62 (peak 65 in high-C grade) |
| Single-layer hardness (with base metal dilution) | HRC 48 – 52 |
| Work-hardening effect | None (unlike EFeMn family) |
| Service temperature limit | ≤ 500 °C (hardness drops sharply above this) |
| Impact toughness | Low - brittle deposit, not for shock loading |
Welding Parameters and Best Practices
Polarity: DC electrode positive (DCEP / DC+) only. AC not recommended for the low-hydrogen basic coating.
Positions: PA (flat) and PB (horizontal) - hardfacing electrodes are not designed for vertical or overhead.
| Diameter × Length | DCEP amperage | Voltage | Bead length |
|---|---|---|---|
| Ø 3.2 × 350 mm | 90 – 130 A | 22–26 V | ≤ 50–70 mm |
| Ø 4.0 × 350 mm | 120 – 170 A | 24–28 V | ≤ 50–70 mm |
| Ø 5.0 × 350 mm | 140 – 210 A | 26–30 V | ≤ 50–70 mm |
Specifications, Packaging, and Delivery
Standard diameters: Ø 3.2 · Ø 4.0 · Ø 5.0 mm
Standard lengths: 350 mm (Ø 3.2 – 5.0) · 450 mm (Ø 4.0 – 5.0, on request)
Packaging:
Primary: 5 kg vacuum-shrink PVC inner box with moisture indicator
Secondary: 4 × 5 kg = 20 kg carton
Palletised: 50 cartons × 20 kg = 1 000 kg / pallet
20' FCL: 20 – 22 MT
Optional: 2 kg small carton, hermetically-sealed tin can (for humid tropical export), private-label OEM printing from 2 000 kg / SKU.
Delivery:
MOQ: 500 kg per diameter
Lead time: 8 – 25 days after order confirmation
Trade terms: EXW · FOB · CFR · CIF (Shanghai / Ningbo / Yiwu)
Payment: T/T 30 % deposit, balance against copy of B/L; L/C at sight negotiable
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