| SEO Title | AWSA5.21 Bare Rods: Grades, Sizes and Common Uses |
| Meta Description | A practical guide to stellite welding rods, including common grades, typical sizes and hardfacing applications for valves, engine valves, saws and industrial wear surfaces. |
| Suggested Slug | cobalt-alloy-bare-rods-grades-sizes-uses |
| Primary Keyword | cobalt alloy bare rods |
| Secondary Keywords | cobalt welding rods, ERCoCr-A, ERCoCr-B, ERCoCr-C, ERCoCr-E, cobalt hardfacing rods |
Cobalt alloy bare rods are used for wear, galling, or corrosion resistance in a cobalt-based deposit without a flux coating. They are commonly supplied as straight, uncoated filler rods for TIG/GTAW and oxy-fuel hardfacing.
The grade changes the deposit behavior, while diameter and length affect how the rod fits the welding process and production setup.
At Shenyang Confident Trading Co., Ltd., we focus on cobalt alloy welding consumables and supply you with most of the required grades, rod sizes, and supply conditions for an existing welding specification or application.
Common Cobalt Alloy Bare Rod Grades
| Grade | Common AWS Reference | Hardness | Typical Use Direction |
| Cobalt Alloy 6 | ERCoCr-A | HRC 43 | Valve sealing surfaces, engine valves, general hardfacing |
| Cobalt Alloy 12 | ERCoCr-B | HRC 47 | Saw-related hardfacing, cutting edges, higher-wear valve surfaces |
| Cobalt Alloy 1 | ERCoCr-C | HRC 53 | Severe-wear surfaces and cutting applications |
| Cobalt Alloy 21 | ERCoCr-E | HRC 20 | Valve and pump components, hot-working surfaces |
ERCOCR-A, ERCOCR-B, and ERCOCR-C are cobalt-chromium-tungsten alloys with different carbide levels. ERCOCr-E is a lower-carbon cobalt-chromium-molybdenum alloy, so its behavior is different from the others.
What Sizes Are Commonly Supplied?
Cobalt alloy bare rods are available in a range of diameters and lengths. Common commercial sizes include diameters of 2.4, 2.7, 3.2, 4.0, 4.8, 5.0, 6.0 and 8.0 mm, etc., with straight lengths such as 1000, 2000 and 4000 mm.
We can also supply custom chemical composition, size, and length, but the availability depends on the alloy grade, production route, and order quantity.
Where Are Cobalt Alloy Bare Rods Used?
Bare rods are mainly used to place a cobalt alloy working layer on selected areas of a component. The aim is usually to protect the surface against wear, galling, erosion or combined high-temperature service while keeping the base component in a more economical material.
- Valve sealing surfaces — cobalt hardfacing is used on seats, discs, wedges and other contact surfaces where metal-to-metal wear and galling are concerns.
- Engine valves — cobalt alloy deposits are used on valve faces and related wear areas that operate under repeated contact and elevated temperature.
- Bandsaw and saw applications — harder grades such as Alloy 12 or Alloy 1 may be used where edge wear and abrasion are dominant.
- General surface hardfacing — shafts, sleeves, wear pads and other localized surfaces can be rebuilt or protected with a cobalt alloy deposit when the service condition justifies it.
Why Work With a Specialist Cobalt Alloy Trader?
Cobalt alloy welding consumables are a narrow product category. Similar grade names may appear in bare rods, wire, covered electrodes and powders, and not every source offers the same sizes or supply condition.
Because we are not only a tader, but a factory with over 30 years of cobalt alloy production experience, we will confirm the correct product form, coordinate suitable supply resources and keep the technical and commercial specification clear from quotation through export delivery.
Need Cobalt Alloy Bare Rods?
Shenyang Confident Trading Co., Ltd. specializes in cobalt alloy welding consumables for industrial hardfacing.
Fill in the inquiry form on this page, or contact us directly with your grade, size, quantity and destination.
Email: marking@sytop.cn
WhatsApp: +86 130 0924 9727
Technical Reference
AWS A5.21/A5.21M:2024 — Specification for Bare Electrodes and Rods for Surfacing