We produce screws, studbolts and nuts ASTM A453 GR 660, Alloy 286, 1.4980 material. It is a precipitation hardening steel heat resistant, recommended in case of high mechanical resistance and corrosion resistance up to 700°C.  It is suitable to be used in jet engines, turbines, gears, paddles, nuts, bolts, spring washers and other devices that require high temperatures resistance.
The corrosion resistance of ASTM A453 GR 660 - ASTM A286 GR 660 is excellent up to 700°C. The  oxidation resistance is good up to 800°C in current “on-order” conditions and up to 980°C in fitful “on-order” conditions.

ASTM A453 GR 660 - ASTM A286 GR 660 can be protected arc welded or arc welded in inert atmosphere. We recommend  soluble not aged condition. Soluble operation up to 980°C  lasting 1 hour and rapid cooling (by air or by water). Precipitation aging at 720°C lasting 16 hours. Forging gap 1150°C up to 1050°C avoiding to go down 930°C. The warping resistance is higher than the austenitic steels one.

We provide high quality standard material in the following grades:

A453 G660 Class A

A453 G660 Class B

A453 G660 Class C

A453 G660 Class D

Requirements:

Z28600+UT

1.2779/660 AGED

ASTM A453 2010 660 class D

ASTM A370 2010

ASTM A638 2010 660 TYPE 2

ASTM A453 2010 660 Class B

NACE MR0175 2003 S66286 SA,AG

ASTM A453 GR 660 - ASTM A286 GR 660 PHYSICAL PROPERTIES

Density
g/cm3 20°C 7.95

Modulus of elasticity
N/mm2 20°C 199.000

Thermal conductivity
W/m.K. (20°C) 12

Specific heat
J/g.K.(20°C) 460

Thermal expansion coefficient
20° - 100°C 16.5
20° - 300°C 17.0
20° - 538°C 17.6
20° - 760°C 18.6

ASTM A453 GR 660 - ASTM A286 GR 660 MECHANICAL PROPERTIES AT ROOM TEMPERATURE

Yield strenghth
RP 0.2 N/mm2 >230

Tensile stength
Rm N/mm2 650(solubile) 930/1180 (solubile + inv.)

Elungation
A5% 55(solubile) ≥12 (solubile + inv.)

Reducton area
Z% 65(solubile) 45(solubile + inv.)