- BS 7S80D
- AMS 5628
|Chemical Element||% Present|
0.12 - 0.17
15.50 - 16.50
0.30 - 0.80
0.20 - 0.60
2.00 - 3.00
Minimum Tensile Properties
Yield Strength at 0.2% Offset
150 ksi (1034 MPa)
200 ksi (1379 MPa)
Elongation in 2 inches or 4D
Reduction of Area
- High strength marine fasteners, bolts and shafts
- Various aerospace components including high strength fasteners
- Valve parts
- Chemical equipment
- Bolts and screws
- High strength and toughness
- Very high corrosion resistance
- Resistance to oxidation up to 800°C
The corrosion resistance of BS S80 is superior to that of the standard chromium grades such as Types 410 and 416. This grade has excellent resistance to corrosion in all conditions of heat treatment from mild acids and alkalis, neutral and basic salts, food acids, and atmosphere.
Maximum resistance is obtained by hardening and polishing.
May be welded by all the commercial processes except forge or hammer welding. Large sections should be preheated prior to welding. Because of air-hardening properties, this grade should be annealed after welding.
BS S80 has better machining characteristics than the chromium-nickel grades. It has a machinability rating of 45%, with 1212 rated 100%. Surface cutting speed on automatic screw machines is approximately 75 ft/min.
This material can be cold formed. If a cold forming operation is undertaken then a stress relieving treatment should be applied.