This specification covers hot rolled or forged and heat treated AISI  410 stainless steel suitable for machining into Blade. It includes  chemical composition, mechanical  properties, nondestructive testing, requirements and test methods in order to evaluate AISI 410 plates and bars.

410 Stainless Steel is hardenable, straight-chromium stainless steels  which combine superior wear resistance of high carbon alloys with the excellent corrosion resistance of chromium stainless steels. Oil quenching these alloys from temperatures between 1800°F to 1950°F (982-1066°C) produces the highest strength and/or wear resistance as well as corrosion resistance. 410 Stainless Steel is used where strength, hardness, and/or wear resistance must be combined with corrosion resistance. 

Metallography

The heat treated samples shall consist of tempered martensite with a maximum of 1.0% delta ferrite. The percentage of delta ferrite shall be determined per AMS 2315. 6.2. The average grain size shall be ASTM grain size number 5 or finer. The maximum size of individual grains, at random distribution, shall not be a 4.

Inclusion Rating

The Specimens shall be free from inclusions exceeding severity level 1.0 for thin and heavy series for all four types of inclusions. The repetition frequency of all types of inclusions with severity levels of 0.5 and 1.0 (thin and heavy series) shall not be more than 10% of inspected fields.

Non-destructive Testing

Visual inspection for superficial defects shall be carried out on each plates. 8.2. Ultrasonic examination shall be done in accordance with AMS-STD-2154 and acceptance criteria is grade AA