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Robotics, manipulators, and enclosures play important supportive roles in the thermal spray industry and can all be customized to your specific needs and goals.

We offer and stock a wide array of TAFA® thermal spray wires. From traditional metal and metal alloys to complex cored wire compositions, we have what it takes to handle your arc spray applications.

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Astro Alloys, Inc. is dedicated to the thermal spray industry while specializing in thermal spray products including HVOF Equipment and thermal spray powders. We began in 1980 and have provided quality thermal spray equipment, supplies, and service to our customers ever since. We believe in and operate with “old-fashioned customer service”, are committed to our customers, and are always willing to go the extra mile. Our facility located in Houston, TX offers expedient, expert service and support to customers throughout North America and around the world.

We supply metal powders designed for additive manufacturing, also known as 3D metal printing. We offer a comprehensive line of cobalt, iron, nickel, & titanium powders.

There are seven separate scales under the Rockwell umbrella, letters A-G, but the most common scales used on steel are B and C, often abbreviated HRB and HRC respectively. The B scale is typically used on softer steels, those under approximately 115,000psi tensile. Testing on the B scale involves a 1/16” steel sphere and a load of 100kgf. The testing machines then determines the amount of indention and assigns it a hardness number, example 98 HRB. Readings above 100 HRB are generally considered unreliable, so the C scale is then used. The C scale is typically used on harder steels, like those above about 110,000psi tensile. Testing on the C scale involves a 120° diamond cone and a load of 150kgf. The test is carried out the same way as the B scale test above, and the result is written as 28 HRC. Readings below 20 HRC are generally considered unreliable, so the B scale is used.

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The Brinell hardness testing method is similar to the above Rockwell testing method with a couple differences. A typical test on steel uses a 10mm diameter steel (or tungsten) ball with 3,000kg of force. A steel ball is used for most materials; the tungsten ball is used primarily for harder materials like tool steel. When a steel ball is used, the result is written as BHN or HBN, example 285 HBN. When a tungsten ball is used, the result is written as HBW, W is the chemical symbol for tungsten (wolfram). Brinell testing is generally considered to be more accurate because the larger ball size makes deeper and wider indentations, thereby averaging the test out over a wider amount of material. However, due to the larger nature of the indentations, it is often considered a destructive test.

Hardness testing of steel is typically done on one of two scales, Rockwell or Brinell. These two scales are similar and each has equivalents on the other scale, similar to the relationship between Celsius and Fahrenheit. They differ in their testing methodology, but both are indentation hardness scales, operating on the principal that material tensile strength is directly correlated to the amount a hardened ball (or cone) will penetrate.

It's no secret that we are known as experts in the fastener industry and have been since 1912. Our devotion to customer service, quality products, and on-time deliveries have propelled us to success since our inception.

A wide range of equipment, supplies, and materials are available, taking care of any and all thermal spray needs. These thermal spray coating systems include HVOF consoles and guns, hard surfacing equipment, plasma and arc spray equipment, Rokide® equipment, cell installations, manipulation equipment and robotics, acoustical enclosures, dust collection and grit blasting equipment, quality thermal spray powders, rods, wires, masking products, and thousands of various spare parts. We carry thermal spray powders from top manufacturers including Praxair, Saint-Gobain, Wall Colmonoy, and Kennametal Stellite™.

Whether it be HVOF, plasma, arc spray or rokide equipment that you are in need of, we can help. We offer an extensive line of quality thermal spray equipment.

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Approximate equivalents between the Brinell and Rockwell hardness scales, as well as their rough correlation to material tensile strength. Brinell 3000kg Load 10mm Ball Rockwell Approx Tensile Strength, psi Diameter, mm Hardness Number B Scale C Scale 2.25 745 - 65.3 - 2.30 712 - - - 2.35 682 - 61.7 - 2.40 653 - 60.0 - 2.45 627 - 58.7 - 2.50 601 - 57.3 - 2.55 578 - 56.0 - 2.60 555 - 54.7 298,000 2.65 534 - 53.5 288,000 2.70 514 - 52.1 274,000 2.75 495 - 51.0 264,000 2.80 477 - 49.6 252,000 2.85 461 - 48.5 242,000 2.90 444 - 47.1 230,000 2.95 429 - 45.7 219,000 3.00 415 - 44.5 212,000 3.05 401 - 43.1 202,000 3.10 388 - 41.8 193,000 3.15 375 - 40.4 184,000 3.20 363 - 39.1 177,000 3.25 352 110.0 37.9 170,000 3.30 341 109.0 36.6 163,000 3.35 331 108.5 35.5 158,000 3.40 321 108.0 34.3 152,000 3.45 311 107.5 33.1 147,000 3.50 302 107.0 32.1 143,000 3.55 293 106.0 30.9 139,000 3.60 285 105.5 29.9 136,000 3.65 277 104.5 28.8 131,000 3.70 269 104.0 27.6 128,000 3.75 262 103.0 26.6 125,000 3.80 255 102.0 25.4 121,000 3.85 248 101.0 24.2 118,000 3.90 241 100.0 22.8 114,000 3.95 235 99.0 21.7 111,000 4.00 229 98.2 20.5 109,000 4.05 223 97.3 18.8 104,000 4.10 217 96.4 17.5 103,000 4.15 212 95.5 16.0 100,000 4.20 207 94.6 15.2 99,000 4.25 201 93.8 13.8 97,000 4.30 197 92.8 12.7 94,000 4.35 192 91.9 11.5 92,000 4.40 187 90.7 10.0 90,000 4.45 183 90.0 9.0 89,000 4.50 179 89.0 8.0 88,000 4.55 174 87.8 6.4 86,000 4.60 170 86.8 5.4 84,000 4.65 167 86.0 4.4 83,000 4.70 163 85.0 3.3 82,000 4.80 156 82.9 0.9 80,000 4.90 149 80.8 - - 5.00 143 78.7 - - 5.10 137 76.4 - - 5.20 131 74.0 - - 5.30 126 72.0 - - 5.40 121 69.8 - - 5.50 116 67.6 - - 5.60 111 65.7 - -

Our relationships with the world-leading powder providers and manufacturers date back as early as the 80’s and continue today. With our broad experience in all varieties of Thermal Spray Powders, we are highly qualified to help you produce the engineered surface you need.