CA6NM ASTM A743 is a kind of low carbon martensitic stainless steel. It has good mechanical properties and has many equivalent grades
CA6NM stainless steel is a kind of low carbon martensitic stainless steel. It has good mechanical properties, static fracture toughness, and underwater fatigue performance of large section, and also has good cavitation resistance and welding performance. It is an excellent material for turbine and pump parts.CA6NM equiivalent grades, heat treatment, properties & applications are as following
CA6NM equivalent grades are as following
|DIN 1.4313, DIN X4CrNi13-4
|EN X3CrNiMo13-4, EN GX5CrNi134, EN 1.4313
|UNS J91540, UNS S41500
|CA6NM equivalent of forging
|CA6NM equivalent of casting
The steel is mainly quenched and tempered and has different heat treatment processes according to different performance requirements.
The following are typical heat treatment processes：
Conditioning 1000-1050℃ normalizing
This steel is generally used for parts with severe cavitation and high requirements for comprehensive mechanical properties, such as runner blades, upper crown, lower ring, leak stop ring, and wear plate in the turbine. In pump products, it is mainly used to make pump impeller with high anti-cavitation performance or feedwater pump shaft with high mechanical performance. At the same time, it can also be used to manufacture various important parts bearing impact and high load, such as connectors and fasteners.
Thermal conductivity λ= 0.06-0.065 W/m℃
Specific heat capacity C=460J/kg·℃
CA6NM density： ρ= 7.74-7.75kg/m3
Martensitic stainless steel with strong ferromagnetism.
Oxidation resistance: the steel has excellent oxidation resistance.
Corrosion resistance: it has good corrosion resistance to general corrosive media (such as brine, nitric acid and some organic acids with low concentration) at room temperature,。
Underwater fatigue property： σ – 1 = 260-300 MPa
Elastic modulus at room temperature E=200Gpa
Fracture properties K1C=390MN/m3/2
Hot working performance: forging temperature range 1050-1150 ℃, final forging temperature greater than 850 ℃.
The weldability of the steel is good, the hardening tendency of HAZ is small and the stress is small. However, as cast, welding is strictly prohibited
Repair welding and cutting riser and other thermal process operations. After 600-650 softening annealing treatment, the castings shall be repaired or welded before quenching and tempering.
CA6NM stainless steel has high strength and toughness after heat treatment, so it has good machinability and grindability.
CA6NM stainless steel has excellent casting properties, and it is not easy to produce cracks during solidification and shrinkage. However, reasonable design of gating and riser system should be paid attention to.