C17510

🌐JIS and international equivalents

“Close” means composition or properties are not exactly the same. Before substituting, check the values in each standard.

📄Related specifications (AMS, ASTM etc.)

Specifications called up on purchase orders and drawings. AMS are SAE aerospace material specifications, split by product form (bar, plate, forging), melting practice and heat treatment. Standard texts are paid, so only titles and scopes checked on the publishers’ public pages are shown.

All ASTM standards on Kezuriba: ASTM standards quick reference.

💪Mechanical properties

“Reference” values are not specified minimums from the standard but figures published by makers and others.

1 MPa ≈ 145 psi (0.145 ksi). Hardness conversion · unit converter

🔧Machinability notes (as stated in the sources)

• In Materion's machinability rating (ASTM E618 method, free-cutting brass C36000 = 100%), Alloy 3 (C17510) is 40%. High-strength Alloy 25 (C17200) is 20% and leaded M25 is 50%^[9]
• On Fisk Alloy Wire's workability index (5 levels), the machinability of C17510 is 1 (Poor) and its cold workability is 5 (Excellent)^[3]
• Materion's recommended conditions (Alloys 3 and 10): turning at 450–550 m/min in all tempers, feed 0.25–0.64 mm/rev, depth of cut 1.27–3.18 mm, carbide C-2. Drilling at 60–180 m/min for A and H and 40–150 m/min for AT and HT, feed 0.05–0.13 mm/rev, high-speed steel. Tapping at 6–45 m/min for A, 3–18 for H, and 3–30 for AT and HT (high-speed steel); reduce the speed as the tap diameter gets smaller. Materion notes that tapping speed is especially important^[6]
• Always machine beryllium copper wet (with cutting fluid). Use sharp tools with a positive rake of 5–20°. Use a chip breaker when turning. Always grind wet as well. Sulfur-based oils cause discoloration, so remove them after machining (especially if the part is to be age hardened afterward)^[6][9]
• Lead-free beryllium copper produces long, tough chips that are hard to handle in the annealed or cold-worked condition, so it is normally machined in the age-hardened condition (AT and HT). It work-hardens easily with shallow cuts or dull tools, so use enough feed to cut beneath the hardened layer^[6][9]
• Rod and bar are normally supplied annealed (A) or cold drawn (H) and heat treated after machining. Heat-treated material is available only above 11.0 mm (0.4375 in) in diameter or thickness. The standard age for the high-conductivity grade is 480–500°C × 2–3 hours (2 hours for cold-worked material, 3 hours for annealed material). Unlike Alloy 25 (about 0.2% shrinkage), the dimensional change on aging is negligible for most applications^[2][6]
• When Alloy 3 bar is machined on an automatic lathe, residual stress from tool wear can reach a problematic level while the dimensions are still within tolerance, and the part may distort in later machining or heat treatment. Replace tools early and apply plenty of coolant^[9]
• [Safety] In solid form it poses no special health risk, but inhaling dust, mist or fume produced by machining may cause serious lung disease (chronic beryllium disease) in some people. The degree of hazard depends on the product form, the machining method and the beryllium content. Read the SDS before working (Materion)^[6][2][9]
• [Safety – US] The OSHA beryllium standard (29 CFR 1910.1024) applies to occupational exposure to beryllium in all forms, compounds and mixtures. Exemptions are limited to materials containing less than 0.1% beryllium by weight, and cases where objective data show exposure is below the action level. C17510 contains 0.2–0.6% Be, so it does not fall under the under-0.1% exemption. The permissible limits are an 8-hour TWA of 0.2 µg/m³, a STEL (15 min) of 2.0 µg/m³ and an action level of 0.1 µg/m³^[10][1]
• [Safety – US] NIOSH classifies beryllium and its compounds as potential occupational carcinogens (lung cancer) and lists the target organs as the eyes, skin and respiratory system^[11]
• [Safety – Japan] Under Appendix 3 of the Order for Enforcement of the Industrial Safety and Health Act, a beryllium-containing alloy is a Class 1 specified chemical substance only when beryllium exceeds 3% by weight. C17510 (Be 0.2–0.6%) does not fall within this definition. However, materials from a Ministry of Health, Labour and Welfare study group record a committee member's opinion that information should be gathered, since chronic beryllium disease and sarcoidosis have been reported among workers handling beryllium alloys with under 3% content^[12][13]