Recommended for mandrels .375" (9.5mm) and less. These proprietary steels are typically 0.5% to 1.0% carbon, 0.093% to 1.97% chromium, 0.2% vanadium and are austenitized at 1550 degrees with a grain size of 9.

LGC 50 - Heat treated and de-gassed HRc 48-55
LGC 100 - Heat treated and de-gassed HRc 52-62

All mandrels are heat treated, oil quenched and tempered at LYNCO.

Martensitic transformation after temper is at 80% with a total transformation to 100% after 5-10 cycles in production.

Chromemoly steels (modified to LYNCO specifications), are typically used in mandrels with diameters of .375" (9.5mm) to 1.000" (25.4mm).

LGC 30 - Aircraft quality steel HRc 32-36
LGC 40 - Heat treated and de-gassed HRc 38-42
LGC OT - Heat treated, oil tempered HRc 44-48

Tubing, normally used in mandrels over 1.5" (38mm), may be following materials.

ASTM A513 - DOM (drawn over mandrel-steel).
ASTM A519 - CDSM (cold drawn seamless material) - steel

6061-T6511 - Extruded aluminum tubing - tensile - 38 KSI
6061-T6 - Drawn aluminum tubing - tensile - 45KSI

TOLERANCES

0.020" (0.5mm) TO 1.500" (38mm) DIA. - +/-0.0015 (0.04mm) STANDARD

1.500" (38mm) TO 6.000" (152mm) DIA. -+/-0.003 (0.075mm) STANDARD

6.000" (152mm) TO 20.00 (508mm) DIA. -+/-0.005 (0.127mm) STANDARD

Larger mandrels - ground or machined to specification.

SURFACE COATINGS

Steel mandrels can be hard chrome plated in diameters up to 20" (508mm) and lengths up to 38' (11.6 meters).

Hard chrome plate: MIL SPEC QQC-320 Class II IAW - LGC 25/5

Aluminum mandrels can be hard anodized in diamteres up to 40" (1 meter) and lengths up to 40' (12 meters).

Hard anodizing: MIIL-A-8625 (F) TYPE III CLASS 1 LGC 11/10 UNSEALED.

SURFACE FINISHES