AISI CA6-NM is a low carbon martensitic stainless steel with basic corrosion resistance, good strength, good toughness and weldability compared to most martensitic stainless steels.
AISI CA6-NM Approximate Composition - 13% Cr, 4.0% Ni, 0.5% Mo ≤ 0.05% C (EN and ASTM standards have different chemical compositions).
Each standard grade:
ASTM specification: A352
ASME specification: SA352
UNS number (casting): J91540
UNS number (forging): S41500
Chemical composition
Carbon: ≤0.06%
Manganese : ≤1.00%
Silicon: ≤1.00%
Phosphorus: ≤0.04%
Sulfur: ≤0.03%
Chromium: 11.50-14.00%
Nickel: 3.50-4.50%
Molybdenum: 0.40-1.00%
Physical Properties
Yield Strength:80ksi
Elongation:≥15%
Reduced Area:≥35%
CA6NM has the following characteristics:
●Basic Resistance to Pitting and Crevice Corrosion
●Moderate Resistance to Liuliized Stress Cracking
●Good yield strength (values from 520 to 800 MPa in EN standards, depending on heat treatment)
●Better toughness than most martensitic grades (only one of the 2 martensitic grades in the EN pressure standard has an impact toughness of less than zero)
●Good weldability compared to other martensitic grades. Still requires pre- and post-weld heat treatment
CA6NM is made possible by the addition of Ni and Mo to CA15, molybdenum is added to improve corrosion resistance, low carbon greatly improves weldability and together with nickel produces excellent toughness. Low crack sensitivity and high cavitation resistance.
Typical uses: aerospace, bearings, bushings, chemical and food processing equipment, conveyor rollers, cutlery, impellers, medical equipment, pump and valve components, turbine engine parts.