Cobalt Base Hardfacing Wires – ERCoCr-A / ERCoCr-B / ERCoCr-C / ERCoCr-E (CoCrMo Type)
Overview
Our cobalt base hardfacing wires are produced in Hebei, China, to AWS A5.21 / ASME SFA-5.21 specifications. These wires are designed for overlaying surfaces that must resist a combination of abrasive wear, metal-to-metal galling, corrosion, and elevated temperatures. The product range includes the four most commonly specified cobalt-chromium alloy types:
ERCoCr-A – Balanced wear and impact resistance, widely used on valve seats and pump components.
ERCoCr-B – Higher carbide content than ERCoCr-A, suitable for moderate abrasion with some impact.
ERCoCr-C – High carbon/tungsten version for severe abrasive and erosive conditions.
ERCoCr-E (CoCrMo Type / Cobalt Alloy 21 Equivalent) – Low carbon with molybdenum; strong resistance to cavitation, corrosion, and galling, with relatively low crack sensitivity. Often selected for petrochemical valve trim, steam turbine components, and die buildup.
All grades are available as continuous MIG/GMAW wires (cored or solid form as applicable) and as straight-length TIG rods (GTAW) upon request.
Key Performance Characteristics
Heat Resistance: Deposits retain useful hardness at service temperatures up to approximately 600–800 °C depending on grade.
Wear & Galling Resistance: Chromium carbides in a cobalt-rich matrix provide resistance to sliding wear, fretting, and particle erosion.
Corrosion Resistance: High chromium content supports oxidation and mild chemical resistance; the CoCrMo (ERCoCr-E) grade offers enhanced resistance to reducing environments.
Work-Hardening Surface: Many cobalt deposits work-harden under service, improving surface durability over time.
Controlled Crack Tendency: Especially in the low-carbon CoCrMo grade (ERCoCr-E), the deposit shows comparatively lower susceptibility to heat-affected zone cracking when proper preheat and interpass temperatures are observed.
Major Application Fields
Grade
Typical Applications
ERCoCr-A
Steam / gate / ball valve seats, pump sleeves, bearing journals, turbine blade erosion shields
ERCoCr-B
Knife edges for timber/paper industries, mixer paddles, sugar mill rollers
ERCoCr-C
Crusher hammers, hot shear blades, screw conveyors handling abrasive media, oilfield valve trim exposed to severe erosion
ERCoCr-E (CoCrMo / Alloy 21 Type)
Petrochemical and power plant valve trim, high-pressure water valve seats, forging die buildup, pump shafts in corrosive service, marine engine valve seats
Popular Specifications & Forms
Continuous MIG / GMAW Wire (on spools)
Diameters: 0.8 mm / 1.0 mm / 1.2 mm / 1.6 mm (other sizes available on request)
Spool Types: 5 kg / 10 kg / 15 kg (D200 / D300 plastic or metal spools)
Shielding Gas: 100% Argon (GMAW); Argon + 1–2% O₂ sometimes used for specific procedures
TIG / GTAW Bare Rod (straight lengths)
Diameters: 1.6 mm / 2.0 mm / 2.4 mm / 3.2 mm
Lengths: 305 mm / 355 mm (standard TIG cut lengths)
Typical Chemical Composition (Deposit – Representative Values)

Typical all-weld-metal hardness range:
ERCoCr-A: HRC 37–43
ERCoCr-B: HRC 40–46
ERCoCr-C: HRC 50–58 (two-layer overlay)
ERCoCr-E: HRC 27–40 (can work-harden toward ~48 HRC in service)
Values are illustrative; actual MTC data supplied with each shipment.
Packaging & Shipping
Standard Export Packaging: Moisture-resistant shrink-wrap + inner box + reinforced carton; spools palletized with corner protection and strapping.
TIG Rod Packaging: 1 kg / 5 kg plastic boxes or cardboard tubes, sealed in anti-rust polybags.
Custom Marking: Neutral or customer-branded labels available for OEM orders.
Dispatch from Hebei, China: Goods are prepared at our Hebei facility and shipped via major nearby ports (Tianjin / Qingdao). We monitor production status closely and arrange shipment according to the agreed incoterm and timeline.
Why Source From Us
Manufacturing Oversight in Hebei
Wire drawing, layer winding, and visual/dimensional checks are carried out under documented process control. Batch traceability and inspection records are maintained for every production lot.
Reliable Delivery Commitments
We confirm realistic lead times at order placement and track orders through packing and container loading, helping you plan inventory and project schedules with fewer surprises.
Straightforward Communication & Service
Our sales team replies with practical suggestions—grade selection guidance, preheat/interpass recommendations, spool size matching—so you get the right consumable for your hardfacing procedure rather than a generic quote.
Flexibility for Distributors & End Users
We support mixed-container loading with other welding consumables (aluminum welding wire, stainless steel welding wire, hardfacing wires, silver brazing alloys, etc.) to help optimize shipping cost.
Request a Quotation
If you are sourcing Cobalt Base Hardfacing Wires (ERCoCr-A / B / C / E – Cobalt Alloy 21 type) made in China with dependable quality and shipment from Hebei, please contact us for:
Full specification sheet & typical chemical / hardness data
Sample evaluation (subject to MOQ and region)
FOB / CIF / DAP pricing in your preferred currency and incoterm
We aim to respond to inquiries within one working day.