ECoCr-B Cobalt 12 Welding Electrode — Stellite® 12 | AWS A5.13 Supplier in India
Nicorex Alloys is an ISO 9001 and ISO 14001 certified importer, stockist, and distributor of cobalt-chromium hardfacing consumables based in Mumbai, India. We have ECoCr-B (Cobalt 12)-coated electrodes in stock that meet AWS A5.13 / ASME SFA 5.13 standards, offered at competitive prices, with complete tracking and mill tests.
ECoCr-B is a type of hardfacing electrode made from cobalt, chromium, and tungsten, which is similar to Stellite® 12, Cobalt Alloy 12, and CoCr-B. It contains approximately 16% carbide content and a higher tungsten level than Cobalt 6, forming a dense, wear-resistant coating. It delivers reliable resistance against wear, erosion, and sliding, and this material is suitable for use in moderate impact, sliding, and erosive service. The AWS A5.13 specification calls for C 1.0-1.7%, Cr 25-32%, W 7.0-9.5%, and Co balance. As-welded deposit hardness reaches 45-51 HRC on 2-3 layers, and functional wear resistance extends to roughly 700°C (1292°F). Diameters span 2.4 to 5.0 mm; lengths 300-400 mm. Polarity is DCEP, with AC capability.
The deposits exhibit non-magnetic properties and resist allotropic transformation. ECoCr-B is often used in self-mated configurations or paired with ECoCr-A or ECoCr-C overlays. There are different industries in which this alloy is widely applicable, ranging from industrial cutting edges and saw tips in the timber industry to valve seats requiring >45 HRC, glass mould plungers, engine valve faces, pump vanes, and choke trim in oil and gas service.
ECoCr-B Coated Electrode Specifications
| AWS Classification | ECoCr-B |
|---|---|
| Governing Specification | AWS A5.13 / A5.13M:2010 |
| ASME Specification | SFA 5.13 |
| ASME Section IX F-Number | F-71 (Hardfacing — Cobalt Base) |
| Welding Process | SMAW (Shielded Metal Arc Welding) |
| Electrode Coating Type | Rutile-basic |
| Polarity / Current | DCEP (DC+); also AC |
| Welding Positions | All positions — flat preferred |
| Deposit Hardness (As-Welded) | 45-51 HRC (2-3 layers on mild steel) |
| Alloy Base | Cobalt-Chromium-Tungsten (Co-Cr-W) |
| Magnetic Properties | Non-magnetic |
What Does the AWS Classification ECoCr-B Mean?
| Character(s) | Meaning |
|---|---|
| E | Electrode – covered/coated electrode for SMAW |
| Co | Cobalt-base alloy deposit |
| Cr | Chromium is the principal alloying element after cobalt |
| -B | Variant ‘B’ – higher carbon and tungsten than variant A. AWS A5.13 requires C 1.0-1.7% and W 7.0-9.5% vs ECoCr-A’s C 0.7-1.4% and W 3.0-6.0% |
Weld Deposit Chemical Composition of ECoCr-B (%)
| Element | Carbon (C) | Chromium (Cr) | Tungsten (W) | Cobalt (Co) | Iron (Fe) | Nickel (Ni) | Silicon (Si) | Manganese (Mn) | Molybdenum (Mo) |
|---|---|---|---|---|---|---|---|---|---|
| AWS A5.13 Requirement (%) | 1.0 – 1.7 | 25 – 32 | 7.0 – 9.5 | Remainder | 5.0 max | 3.0 max | 2.0 max | 2.0 max | 1.0 max |
ECoCr-B Deposit Hardness & Wear Performance Characteristics
| Property | As-Welded Hardness (2-3 layers) | Hot Hardness Retention | Tensile Strength | Yield Strength | Elongation | Abrasion Resistance | Impact Resistance |
|---|---|---|---|---|---|---|---|
| Value / Range | 45 – 51 HRC | Functional to ~700°C (1292°F) | ~107 ksi (738 MPa) but not AWS-mandated | ~84 ksi (579 MPa) – not AWS-mandated | <1% – not AWS-mandated | Superior to ECoCr-A | Good, but slightly below ECoCr-A |
Substrate Metals Compatible with ECoCr-B Hardfacing Overlay
| Substrate | Typical Grades | Preheat (°C) | Buffer Layer? |
|---|---|---|---|
| Carbon Steel | A105, SA516 Gr.70, SA36 | 200-350 | Optional (309L / Inconel 625) |
| Low-Alloy / Cr-Mo Steel | A182 F11, F22, F91 | 300-450 | Recommended (Inconel 625 or 309L) |
| Austenitic Stainless | 304, 316, CF8M | 10-100 | Optional |
| Duplex Stainless | 2205, 2507 | ~100 | Recommended (Inconel 625) |
Electrode Sizes & Recommended Welding Parameters for ECoCr-B
| Diameter | Length | Current (DCEP / AC) |
|---|---|---|
| 2.4 mm (3/32″) | 300 mm (12″) | 60-90 A |
| 3.2 mm (1/8″) | 350 mm (14″) | 90 – 130 A |
| 4.0 mm (5/32″) | 350 mm (14″) | 130 – 175 A |
| 4.8 mm (3/16″) | 400 mm (16″) | 155 – 200 A |
Get ECoCr-B Cobalt 12 Welding Electrode at Competitive Prices
Industrial Applications of ECoCr-B (Cobalt 12) Hardfacing Electrode
- The most distinctive use of ECoCr-B: industrial knife edges for carpets, plastics, papers, and synthetic fibres use 45-51 HRC to maintain geometry after millions of cycles. Timber saw tips and chainsaw guide bars benefit.
- This material works for valve seats and gates with seat face temperatures >45 HRC or erosive media like sand-laden fluids. This material is used in oil and gas, power, and chemical processing gates, globes, and control valves.
- Narrowneck glass mould plungers and control plates employ ECoCr-B for its hot hardness up to ~700°C, which matches glass forming temperatures and can withstand continuous thermal cycling.
- Pinch rollers, rotor blade edges, exhaust valve faces, extrusion dies, and drawing blocks are improved by ECoCr-B's higher tungsten content, which gives them better
- Choke valve trim, flow control seats, pump vanes, and bearing bushes in erosive fluids. ECoCr-B is selected over ECoCr-A when particulate drives accelerated wear.
Storage, Handling & Reconditioning of ECoCr-B Electrodes
Moisture in the coating causes porosity.
Sealed packaging: No pre-use baking needed. After opening: Transfer to a holding oven at 100-150°C. Reconditioning: Bake at 150°C for 1 hour if exposed to humidity. Maximum 2 reconditioning cycles; discard if exceeded.
Ordering ECoCr-B (Cobalt 12) Hardfacing Electrode from Nicorex Alloys
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AWS Classification - ECoCr-B (or equivalent trade name)
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Quantity - kg
-
Diameter(s) - 2.4, 3.2, 4.0, 4.8, or 5.0 mm
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Packaging - Sealed cans, vacuum cartons
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Third-Party Approval Needs - DNV, ABS, BV, TUV, Lloyd's
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Certificate Requirements - Standard MTC 3.1 or enhanced
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Delivery Destination & Shipping Terms - Delivery destination and shipping terms
- Project Specification - ASME, NACE, NORSOK, client spec number
Frequently Asked Questions
What is the Price of ECoCr-B Cobalt 12 Hardfacing Electrode per Kg in India?
ECoCr-B pricing varies by diameter, order volume, and cobalt market rates. Request a quotation from Nicorex Alloys with MTC 3.1 documentation.
Is ECoCr-B Stellite 12 Type Electrode Suitable for Industrial Knife and Saw Tip Hardfacing?
What is the Maximum Service Temperature for an ECoCr-B Cobalt Weld Overlay?
ECoCr-B retains functional hardness to roughly 700°C (1292°F) approximately 200°C higher than ECoCr-A’s practical limit of ~500°C. For continuous service above 700°C, consider Tribaloy T-400C or T-800.