ERCoCr-B Filler Wire

COREWELD ST12 ERCoCr-B Filler Wire is a cobalt-based hardfacing filler material for components that need wear resistance and performance at elevated temperatures. Welders apply it on surfaces subject to abrasion, friction and demanding operating conditions, such as cutting edges, valve seats, and sliding faces. Material selection depends on the component, its service conditions and the applicable welding procedure, so match the alloy to the job before you place an order. Review the classification, dimensions and composition limits in the datasheet before you plan a deposit.

Click Here To Download ERCoCr-B Filler Wire Datasheet

AWS A5.21 ERCoCr-B places this alloy in the cobalt base hardfacing group, a cobalt, chromium, tungsten and carbon system that targets surfaces under wear. Hard carbides lie inside a cobalt matrix, and that structure gives the family its hardness and wear resistance. Published data for the alloy family also reports hardness retention at elevated temperatures, but COREWELD ST12 service limits are specified only in its datasheet.

Product form deserves attention. A bare cast rod arrives in straight lengths for manual deposition. A continuously supplied welding wire feeds from a spool or coil into mechanised equipment. Confirm which forms COREWELD ST12 offers before you set up a procedure.

ERCoCr-B Filler Wire, AWS A5.21 ERCoCr-B, COREWELD ST12 Filler Wire

Cobalt base composition sets the character of COREWELD ST12. Chromium and tungsten carbides in the deposit supply hardness and resistance to abrasion and friction, while the cobalt matrix holds those carbides in place. The same chemistry supports corrosion resistance and hardness retention at elevated temperatures, and each property holds only within the limits on the datasheet. Buyers can evaluate the product for sliding contact, cutting edges and flow control components. Component life depends on the base metal, joint design, welding procedure and operating environment, so no single figure applies to every job. Test a trial deposit on the actual component when the duty is severe.

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Table of Content

Technical Specifications of COREWELD ST12

The table lists the core details of COREWELD ST12 ERCoCr-B. Entries marked for confirmation follow the official datasheet, so compare them with that document before you finalise a procedure or an order.

Specification	Details
Brand	COREWELD ST12
Product Name	ERCoCr-B Filler Wire
AWS Classification	ERCoCr-B
Applicable Standard	AWS A5.21 / ASME SFA A5.21
Material Type	Cobalt Base Hardfacing Alloy (Bare Wire Cobalt)
Product Form	Bare Cast Rod (Referred to as “Type 12 bare rod”)

Chemical Composition of ERCoCr-B Filler Wire

ERCoCr-B balances cobalt, chromium, carbon, and tungsten to achieve superior hardness, corrosion resistance, and wear protection. The following tables outline its chemical and mechanical parameters.

Element	AWS Requirement (%)	Typical Deposit (%)
Cobalt (Co)	Remainder	Balance
Chromium (Cr)	26 – 32	30.4
Carbon (C)	1.2 – 1.7	1.5
Tungsten (W)	7.0 – 9.5	8.5
Nickel (Ni)	3.0 max	2.2
Iron (Fe)	3.0 max	2.3
Molybdenum (Mo)	1.0 max	0.1
Manganese (Mn)	1.0 max	0.06
Silicon (Si)	2.0 max	1.3
Other	0.50 max	Not specified

Mechanical Properties of AWS A5.21 ERCoCr-B

Property	Value
Hardness	High hardness (Specific HRC / HB value is not specified in the datasheet, but it is non-forgeable and machined with difficulty using carbide tools)
Wear Resistance	High abrasion resistance and good corrosion resistance (carbide-strengthened cobalt matrix)

Equivalent Grades of ERCoCr-B

AWS A5.21 ERCoCr-B has equivalents across standards and trade names, listed below. Treat them as reference points and confirm exact matches against the datasheet before any substitution.

System	Designation
AWS A5.21	ERCoCr-B
ASME SFA 5.21	ERCoCr-B
UNS	R30012
AWS A5.13 (electrode form)	ECoCr-B
Trade name	Stellite 12

Applications of ERCoCr-B Filler Material

Cutting tool edges and knives
Saw teeth and guides
Valve seats and trim
Pump sleeves and wear rings
Shear blades
Extruder screws and flights
Bearing and sliding surfaces
Chemical process equipment parts

Manufacturing Process of ERCoCr-B Filler Material

Material selection of cobalt, chromium, tungsten and carbon feedstock
Alloying and melting to the target composition
Forming process into the supplied rod or wire form
Composite filler metal selection for the intended hardfacing duty

Why Choose COREWELD ST12 ERCoCr-B?

Start with the documents when you assess COREWELD ST12 for a hardfacing requirement. The product carries the AWS A5.21 ERCoCr-B classification, and the official datasheet lists the alloy details, available dimensions and packaging in one place. Compare those entries with your base material, deposition process and service conditions. Review the datasheet to confirm alloy details and application suitability before you commit to a purchase. A datasheet does not replace a procedure qualification, so validate the weld on your own component. Buyers who need dimensional or packaging confirmation can raise it at the enquiry stage, which keeps the specification aligned with the job.

Supply Options and Technical Support

Enquire about ERCoCr-B Filler Wire by stating the product form, diameter, rod length, quantity and packaging you need. Add the component material, service temperature and wear conditions, because these details shape the product recommendation. Ask the company to confirm supply terms, delivery schedules and technical support when you enquire.

Send your requirement with the component details to request a quotation.

FAQ's

What is ERCoCr-B filler wire used for?

It hardfaces components that face abrasion, friction and elevated temperatures. Targets include cutting edges, saw teeth, valve seats and extruder screws, where a cobalt base deposit protects the working surface.

What is the AWS A5.21 ERCoCr-B classification?

AWS A5.21 sets requirements for bare surfacing electrodes and rods. ERCoCr-B names the cobalt, chromium and tungsten alloy within that standard, and it sits between the A and C grades.

What is COREWELD ST12?

COREWELD ST12 is the brand name for this cobalt base hardfacing product, supplied to the ERCoCr-B classification. Its datasheet carries the product details, including form, dimensions and packaging, so read it before you specify the product.

What is the difference between ERCoCr-B and other cobalt base hardfacing alloys?

ERCoCr-B holds a higher carbide fraction than the A grade, which raises abrasion resistance at some cost to toughness. The C grade carries more carbon again, so ERCoCr-B occupies the middle ground.

Which industries use ERCoCr-B filler material?

Valve manufacturing, cutting tool production, plastics extrusion, power generation and chemical processing apply it to wear surfaces. Check suitability for your own duty against the datasheet before you select it for a new component.

What product forms and sizes are available for COREWELD ST12?

The datasheet lists the confirmed forms, diameters, rod lengths and packaging for COREWELD ST12. Send your preferred form and dimensions with an enquiry to confirm current availability and packaging for your order.