ERCoCr-C Filler Wire
COREWELD ST1 ERCoCr-C Filler Wire is a cobalt-based hardfacing material for components that face abrasion, erosion, and elevated service temperatures. Welders deposit it on compatible base metals to build a hard, wear-resistant surface where the substrate alone would lose material quickly. The ERCoCr-C classification belongs to the cobalt, chromium, and tungsten family used on valve seats, pump sleeves, and cutting edges.
The datasheet lists technical specifications, chemical composition, mechanical properties, and product details for COREWELD ST1. Download it before you plan a procedure or place an order.
What is ERCoCr-C Filler Wire?
ERCoCr-C is a cobalt base hardfacing classification defined in AWS A5.21. Fabricators select it when a component needs a durable surface that resists abrasive wear and holds up at elevated temperatures. The alloy suits compatible parts such as valve seats, pump sleeves, and expeller screws. Suitability changes with the base material, the operating conditions, and the welding or hardfacing procedure, so match all three against the manufacturer’s recommendations before you commit to a component. ERCoCrC Cobalt Base Bare Cast Rod is the alternative designation used for this product.
ERCoCr-C Filler Wire, ERCoCrC Cobalt Base Bare Cast Rod, COREWELD ST1 Filler Wire Supplier
COREWELD ST1 pairs a cobalt base composition with an intended hardfacing role. Its datasheet documents the hardness, wear resistance, and operating temperature data that matter for abrasion, erosion, and heat exposure. Compare those documented figures with the demands of your component, such as contact load, sliding wear, and service temperature, instead of assuming them. Then confirm base material compatibility and the recommended procedure.
Cobalt forms the matrix that retains strength at elevated temperatures. Chromium adds oxidation and corrosion resistance and forms exceptionally durable carbides. Carbon raises hardness and abrasion resistance through carbide formation, though it lowers ductility. Tungsten strengthens the matrix and adds to the carbide network. Nickel and iron appear in limited amounts, and the datasheet states the limit for each. Mechanically, ERCoCr-C offers exceptional hardness (typically 50-60 HRC) and high-temperature wear resistance, though its dense carbide network results in near-zero ductility and very low impact tolerance.
Technical Specifications of COREWELD ST1
The table lists the core product details. Datasheet values take precedence on every entry.
| Specification | Details |
| Brand | COREWELD ST1 |
| Product Name | ERCoCr-C Filler Wire |
| Alternative Designation | ERCoCrC Cobalt Base Bare Cast Rod |
| Material Type | Cobalt-Based Alloy |
| Product Form | Bare cast rod / TIG bare rod (GTAW); also available as OAW cast rod and MIG/PTA wire, depending on variant |
| Applicable Classification | ERCoCr-C, per AWS A5.21 / ASME SFA-5.21 |
| Welding or Hardfacing Process | Oxy-acetylene welding (OAW), GTAW/TIG, and PTA hardfacing; MIG wire variants may also be used for wire-fed hardfacing. |
| Available Diameters | TIG bare rod: 1.6, 2.4, 3.2, 4.0, 4.8 mm OAW cast rod: 3.2, 4.0, 4.8, 6.4, 8.0 mm MIG/PTA wire: 0.9, 1.0, 1.2, 1.6 mm |
| Rod or Wire Length | 1,000 mm (36 in.) standard for rods; continuous wire supplied in spools or bulk drums |
| Packaging | TIG bare rod: 2.5 kg or 5.0 kg tubes OAW cast rod: 5.0 kg tubes MIG/PTA wire: 5 kg or 12.5 kg spools Bulk PTA wire: 25 kg drums |
| Base Material Compatibility | Suitable for hardfacing carbon steels, low-alloy steels, stainless steels, and cobalt-based alloys; typically applied where high abrasion, metal-to-metal wear, and elevated-temperature resistance are required |
Chemical Composition of ERCoCr-C Filler Wire
| Element | Composition |
| Cobalt (Co) | Balance |
| Chromium (Cr) | 26.0 – 33.0 |
| Carbon (C) | 2.0 – 3.0 |
| Tungsten (W) | 11.0 – 14.0 |
| Nickel (Ni) | 11.0 – 14.0 |
| Iron (Fe) | 3.0 max |
| Other Elements | As specified by manufacturer |
Mechanical Properties of ERCoCrC Cobalt Base Bare Cast Rod
| Property | Value |
| Hardness | 50–58 HRC (approximately 550 – 720 HV); weld deposits are commonly about 51 – 60 HRC. |
| Operating Temperature | Retains hardness above 760°C (1,400°F); practical high-temperature service is commonly around 500 – 900°C depending on load and environment. |
Equivalent Grades of ERCoCr-C Wire
| Standard or Designation | Equivalent |
| AWS A5.21 | ERCoCr-C |
| Trade Designation | Stellite 1 |
| UNS | R30001 |
| EN ISO 14700 | S Co3 |
| COREWELD ST1 Alternative Designation | ERCoCrC Cobalt Base Bare Cast Rod |
Applications of COREWELD ST1 Filler Wire
- Valve seats and valve trim
- Steam valve components
- Exhaust valve faces
- Pump sleeves
- Expeller screws
- Impellers
- Plastic recycling equipment
- Mixer blades for rubber processing
- Hot cutting blades
Manufacturing Process of ERCoCr-C Cobalt Based Filler Material
- Material Selection: Producers select cobalt, chromium, tungsten, and carbon sources that meet the ERCoCr-C chemistry.
- Alloying and Melting: Melting blends the raw materials into the target composition.
- Forming Processes: Casting shapes the alloy into bare rods, while drawing or similar routes produce wire, depending on the product form.
- Composite Filler Metal Production: Where a composite format applies, alloy powders fill a tubular sheath to form the wire.
Why Choose COREWELD ST1 ERCoCr-C Filler Wire?
Evaluate COREWELD ST1 when a hardfacing job calls for a cobalt base consumable under the ERCoCr-C classification. The datasheet documents chemical composition, hardness information, available dimensions, and packaging, so you can check each item against your drawing. Read it first, and request clarification on any entry. Then confirm compatibility with the component material and the service environment.
ERCoCr-C Filler Wire Supply and Technical Support
COREWELD Ti2 backs its ERTi-2 rod with an official datasheet. Buyers can check the classification, available dimensions, and packaging in that document before ordering. Technical assistance supports rod selection on enquiry.
ERTi-2 TIG Rod Supply and Technical Support
Supply options, dimensions, and packaging for Filler Wire appear in the datasheet, and technical staff answer procedure questions. State the component material, required product form, dimensions, and operating conditions when you request information. Ask for stock and delivery details in the same enquiry so the reply covers every point.
Products
FAQ's
What is ERCoCr-C filler wire used for?
It hardens components that face abrasion, erosion, and elevated temperatures. Targets include valve seats, pump sleeves, expeller screws, and cutting blades. The base material and operating conditions decide whether the alloy suits a given part.
What is ERCoCrC cobalt base bare cast rod?
ERCoCrC Cobalt Base Bare Cast Rod is the alternative designation for COREWELD ST1. It names the ERCoCr-C cobalt base alloy as a bare, uncoated filler for hardfacing. The datasheet confirms the exact form supplied.
What is the difference between filler wire and bare cast rod?
Wire ships on coils or spools for continuous feeding. Bare cast rod ships in straight lengths for manual deposition. The alloy class can match across both, and the datasheet confirms which form COREWELD ST1 supplies.
Which applications are suitable for COREWELD ST1?
Applications include valve seats, steam valve components, pump sleeves, impellers, plastic recycling equipment, rubber mixer blades, and hot cutting blades. Confirm base material compatibility and procedure before committing to a component.
What is the chemical composition of ERCoCr-C?
The datasheet lists the cobalt, chromium, carbon, tungsten, nickel, and iron content for COREWELD ST1, with cobalt as the balance. Use those datasheet limits instead of generic class values when you review the alloy.
What hardness can ERCoCr-C achieve?
Hardness depends on deposit conditions, base material, and dilution. The COREWELD ST1 datasheet records the documented value, so read that figure for your procedure rather than relying on general class data.
Which welding or hardfacing process is recommended for COREWELD ST1?
The datasheet states the recommended process. The choice depends on the product form: wire is suitable for continuous feeding, while bare cast rod is better for manual deposition. Follow the datasheet and a qualified procedure for your base material.